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1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/mm.h>
23#include <linux/module.h>
24#include <linux/file.h>
25#include <linux/slab.h>
26#include <linux/time.h>
27#include <linux/pm_qos.h>
28#include <linux/io.h>
29#include <linux/dma-mapping.h>
30#include <sound/core.h>
31#include <sound/control.h>
32#include <sound/info.h>
33#include <sound/pcm.h>
34#include <sound/pcm_params.h>
35#include <sound/timer.h>
36#include <sound/minors.h>
37#include <linux/uio.h>
38
39/*
40 * Compatibility
41 */
42
43struct snd_pcm_hw_params_old {
44 unsigned int flags;
45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
46 SNDRV_PCM_HW_PARAM_ACCESS + 1];
47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
49 unsigned int rmask;
50 unsigned int cmask;
51 unsigned int info;
52 unsigned int msbits;
53 unsigned int rate_num;
54 unsigned int rate_den;
55 snd_pcm_uframes_t fifo_size;
56 unsigned char reserved[64];
57};
58
59#ifdef CONFIG_SND_SUPPORT_OLD_API
60#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
61#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
62
63static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params_old __user * _oparams);
65static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67#endif
68static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
69
70/*
71 *
72 */
73
74static DEFINE_RWLOCK(snd_pcm_link_rwlock);
75static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77/* Writer in rwsem may block readers even during its waiting in queue,
78 * and this may lead to a deadlock when the code path takes read sem
79 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
80 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
81 * spin until it gets the lock.
82 */
83static inline void down_write_nonblock(struct rw_semaphore *lock)
84{
85 while (!down_write_trylock(lock))
86 cond_resched();
87}
88
89/**
90 * snd_pcm_stream_lock - Lock the PCM stream
91 * @substream: PCM substream
92 *
93 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
94 * flag of the given substream. This also takes the global link rw lock
95 * (or rw sem), too, for avoiding the race with linked streams.
96 */
97void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
98{
99 if (substream->pcm->nonatomic) {
100 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
101 mutex_lock(&substream->self_group.mutex);
102 } else {
103 read_lock(&snd_pcm_link_rwlock);
104 spin_lock(&substream->self_group.lock);
105 }
106}
107EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
108
109/**
110 * snd_pcm_stream_lock - Unlock the PCM stream
111 * @substream: PCM substream
112 *
113 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
114 */
115void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
116{
117 if (substream->pcm->nonatomic) {
118 mutex_unlock(&substream->self_group.mutex);
119 up_read(&snd_pcm_link_rwsem);
120 } else {
121 spin_unlock(&substream->self_group.lock);
122 read_unlock(&snd_pcm_link_rwlock);
123 }
124}
125EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
126
127/**
128 * snd_pcm_stream_lock_irq - Lock the PCM stream
129 * @substream: PCM substream
130 *
131 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
132 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
133 * as snd_pcm_stream_lock().
134 */
135void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
136{
137 if (!substream->pcm->nonatomic)
138 local_irq_disable();
139 snd_pcm_stream_lock(substream);
140}
141EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
142
143/**
144 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
145 * @substream: PCM substream
146 *
147 * This is a counter-part of snd_pcm_stream_lock_irq().
148 */
149void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
150{
151 snd_pcm_stream_unlock(substream);
152 if (!substream->pcm->nonatomic)
153 local_irq_enable();
154}
155EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
156
157unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
158{
159 unsigned long flags = 0;
160 if (!substream->pcm->nonatomic)
161 local_irq_save(flags);
162 snd_pcm_stream_lock(substream);
163 return flags;
164}
165EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
166
167/**
168 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
169 * @substream: PCM substream
170 * @flags: irq flags
171 *
172 * This is a counter-part of snd_pcm_stream_lock_irqsave().
173 */
174void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
175 unsigned long flags)
176{
177 snd_pcm_stream_unlock(substream);
178 if (!substream->pcm->nonatomic)
179 local_irq_restore(flags);
180}
181EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
182
183static inline mm_segment_t snd_enter_user(void)
184{
185 mm_segment_t fs = get_fs();
186 set_fs(get_ds());
187 return fs;
188}
189
190static inline void snd_leave_user(mm_segment_t fs)
191{
192 set_fs(fs);
193}
194
195
196
197int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
198{
199 struct snd_pcm_runtime *runtime;
200 struct snd_pcm *pcm = substream->pcm;
201 struct snd_pcm_str *pstr = substream->pstr;
202
203 memset(info, 0, sizeof(*info));
204 info->card = pcm->card->number;
205 info->device = pcm->device;
206 info->stream = substream->stream;
207 info->subdevice = substream->number;
208 strlcpy(info->id, pcm->id, sizeof(info->id));
209 strlcpy(info->name, pcm->name, sizeof(info->name));
210 info->dev_class = pcm->dev_class;
211 info->dev_subclass = pcm->dev_subclass;
212 info->subdevices_count = pstr->substream_count;
213 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
214 strlcpy(info->subname, substream->name, sizeof(info->subname));
215 runtime = substream->runtime;
216 /* AB: FIXME!!! This is definitely nonsense */
217 if (runtime) {
218 info->sync = runtime->sync;
219 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
220 }
221 return 0;
222}
223
224int snd_pcm_info_user(struct snd_pcm_substream *substream,
225 struct snd_pcm_info __user * _info)
226{
227 struct snd_pcm_info *info;
228 int err;
229
230 info = kmalloc(sizeof(*info), GFP_KERNEL);
231 if (! info)
232 return -ENOMEM;
233 err = snd_pcm_info(substream, info);
234 if (err >= 0) {
235 if (copy_to_user(_info, info, sizeof(*info)))
236 err = -EFAULT;
237 }
238 kfree(info);
239 return err;
240}
241
242static bool hw_support_mmap(struct snd_pcm_substream *substream)
243{
244 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
245 return false;
246 /* check architectures that return -EINVAL from dma_mmap_coherent() */
247 /* FIXME: this should be some global flag */
248#if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
249 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
250 if (!substream->ops->mmap &&
251 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
252 return false;
253#endif
254 return true;
255}
256
257#undef RULES_DEBUG
258
259#ifdef RULES_DEBUG
260#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
261static const char * const snd_pcm_hw_param_names[] = {
262 HW_PARAM(ACCESS),
263 HW_PARAM(FORMAT),
264 HW_PARAM(SUBFORMAT),
265 HW_PARAM(SAMPLE_BITS),
266 HW_PARAM(FRAME_BITS),
267 HW_PARAM(CHANNELS),
268 HW_PARAM(RATE),
269 HW_PARAM(PERIOD_TIME),
270 HW_PARAM(PERIOD_SIZE),
271 HW_PARAM(PERIOD_BYTES),
272 HW_PARAM(PERIODS),
273 HW_PARAM(BUFFER_TIME),
274 HW_PARAM(BUFFER_SIZE),
275 HW_PARAM(BUFFER_BYTES),
276 HW_PARAM(TICK_TIME),
277};
278#endif
279
280int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
281 struct snd_pcm_hw_params *params)
282{
283 unsigned int k;
284 struct snd_pcm_hardware *hw;
285 struct snd_interval *i = NULL;
286 struct snd_mask *m = NULL;
287 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
288 unsigned int rstamps[constrs->rules_num];
289 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
290 unsigned int stamp = 2;
291 int changed, again;
292
293 params->info = 0;
294 params->fifo_size = 0;
295 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
296 params->msbits = 0;
297 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
298 params->rate_num = 0;
299 params->rate_den = 0;
300 }
301
302 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
303 m = hw_param_mask(params, k);
304 if (snd_mask_empty(m))
305 return -EINVAL;
306 if (!(params->rmask & (1 << k)))
307 continue;
308#ifdef RULES_DEBUG
309 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
310 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
311#endif
312 changed = snd_mask_refine(m, constrs_mask(constrs, k));
313#ifdef RULES_DEBUG
314 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
315#endif
316 if (changed)
317 params->cmask |= 1 << k;
318 if (changed < 0)
319 return changed;
320 }
321
322 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
323 i = hw_param_interval(params, k);
324 if (snd_interval_empty(i))
325 return -EINVAL;
326 if (!(params->rmask & (1 << k)))
327 continue;
328#ifdef RULES_DEBUG
329 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
330 if (i->empty)
331 pr_cont("empty");
332 else
333 pr_cont("%c%u %u%c",
334 i->openmin ? '(' : '[', i->min,
335 i->max, i->openmax ? ')' : ']');
336 pr_cont(" -> ");
337#endif
338 changed = snd_interval_refine(i, constrs_interval(constrs, k));
339#ifdef RULES_DEBUG
340 if (i->empty)
341 pr_cont("empty\n");
342 else
343 pr_cont("%c%u %u%c\n",
344 i->openmin ? '(' : '[', i->min,
345 i->max, i->openmax ? ')' : ']');
346#endif
347 if (changed)
348 params->cmask |= 1 << k;
349 if (changed < 0)
350 return changed;
351 }
352
353 for (k = 0; k < constrs->rules_num; k++)
354 rstamps[k] = 0;
355 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
356 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357 do {
358 again = 0;
359 for (k = 0; k < constrs->rules_num; k++) {
360 struct snd_pcm_hw_rule *r = &constrs->rules[k];
361 unsigned int d;
362 int doit = 0;
363 if (r->cond && !(r->cond & params->flags))
364 continue;
365 for (d = 0; r->deps[d] >= 0; d++) {
366 if (vstamps[r->deps[d]] > rstamps[k]) {
367 doit = 1;
368 break;
369 }
370 }
371 if (!doit)
372 continue;
373#ifdef RULES_DEBUG
374 pr_debug("Rule %d [%p]: ", k, r->func);
375 if (r->var >= 0) {
376 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
377 if (hw_is_mask(r->var)) {
378 m = hw_param_mask(params, r->var);
379 pr_cont("%x", *m->bits);
380 } else {
381 i = hw_param_interval(params, r->var);
382 if (i->empty)
383 pr_cont("empty");
384 else
385 pr_cont("%c%u %u%c",
386 i->openmin ? '(' : '[', i->min,
387 i->max, i->openmax ? ')' : ']');
388 }
389 }
390#endif
391 changed = r->func(params, r);
392#ifdef RULES_DEBUG
393 if (r->var >= 0) {
394 pr_cont(" -> ");
395 if (hw_is_mask(r->var))
396 pr_cont("%x", *m->bits);
397 else {
398 if (i->empty)
399 pr_cont("empty");
400 else
401 pr_cont("%c%u %u%c",
402 i->openmin ? '(' : '[', i->min,
403 i->max, i->openmax ? ')' : ']');
404 }
405 }
406 pr_cont("\n");
407#endif
408 rstamps[k] = stamp;
409 if (changed && r->var >= 0) {
410 params->cmask |= (1 << r->var);
411 vstamps[r->var] = stamp;
412 again = 1;
413 }
414 if (changed < 0)
415 return changed;
416 stamp++;
417 }
418 } while (again);
419 if (!params->msbits) {
420 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
421 if (snd_interval_single(i))
422 params->msbits = snd_interval_value(i);
423 }
424
425 if (!params->rate_den) {
426 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
427 if (snd_interval_single(i)) {
428 params->rate_num = snd_interval_value(i);
429 params->rate_den = 1;
430 }
431 }
432
433 hw = &substream->runtime->hw;
434 if (!params->info) {
435 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
436 SNDRV_PCM_INFO_DRAIN_TRIGGER);
437 if (!hw_support_mmap(substream))
438 params->info &= ~(SNDRV_PCM_INFO_MMAP |
439 SNDRV_PCM_INFO_MMAP_VALID);
440 }
441 if (!params->fifo_size) {
442 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
443 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
444 if (snd_mask_min(m) == snd_mask_max(m) &&
445 snd_interval_min(i) == snd_interval_max(i)) {
446 changed = substream->ops->ioctl(substream,
447 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
448 if (changed < 0)
449 return changed;
450 }
451 }
452 params->rmask = 0;
453 return 0;
454}
455
456EXPORT_SYMBOL(snd_pcm_hw_refine);
457
458static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
459 struct snd_pcm_hw_params __user * _params)
460{
461 struct snd_pcm_hw_params *params;
462 int err;
463
464 params = memdup_user(_params, sizeof(*params));
465 if (IS_ERR(params))
466 return PTR_ERR(params);
467
468 err = snd_pcm_hw_refine(substream, params);
469 if (copy_to_user(_params, params, sizeof(*params))) {
470 if (!err)
471 err = -EFAULT;
472 }
473
474 kfree(params);
475 return err;
476}
477
478static int period_to_usecs(struct snd_pcm_runtime *runtime)
479{
480 int usecs;
481
482 if (! runtime->rate)
483 return -1; /* invalid */
484
485 /* take 75% of period time as the deadline */
486 usecs = (750000 / runtime->rate) * runtime->period_size;
487 usecs += ((750000 % runtime->rate) * runtime->period_size) /
488 runtime->rate;
489
490 return usecs;
491}
492
493static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
494{
495 snd_pcm_stream_lock_irq(substream);
496 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
497 substream->runtime->status->state = state;
498 snd_pcm_stream_unlock_irq(substream);
499}
500
501static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
502 int event)
503{
504#ifdef CONFIG_SND_PCM_TIMER
505 if (substream->timer)
506 snd_timer_notify(substream->timer, event,
507 &substream->runtime->trigger_tstamp);
508#endif
509}
510
511static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
512 struct snd_pcm_hw_params *params)
513{
514 struct snd_pcm_runtime *runtime;
515 int err, usecs;
516 unsigned int bits;
517 snd_pcm_uframes_t frames;
518
519 if (PCM_RUNTIME_CHECK(substream))
520 return -ENXIO;
521 runtime = substream->runtime;
522 snd_pcm_stream_lock_irq(substream);
523 switch (runtime->status->state) {
524 case SNDRV_PCM_STATE_OPEN:
525 case SNDRV_PCM_STATE_SETUP:
526 case SNDRV_PCM_STATE_PREPARED:
527 break;
528 default:
529 snd_pcm_stream_unlock_irq(substream);
530 return -EBADFD;
531 }
532 snd_pcm_stream_unlock_irq(substream);
533#if IS_ENABLED(CONFIG_SND_PCM_OSS)
534 if (!substream->oss.oss)
535#endif
536 if (atomic_read(&substream->mmap_count))
537 return -EBADFD;
538
539 params->rmask = ~0U;
540 err = snd_pcm_hw_refine(substream, params);
541 if (err < 0)
542 goto _error;
543
544 err = snd_pcm_hw_params_choose(substream, params);
545 if (err < 0)
546 goto _error;
547
548 if (substream->ops->hw_params != NULL) {
549 err = substream->ops->hw_params(substream, params);
550 if (err < 0)
551 goto _error;
552 }
553
554 runtime->access = params_access(params);
555 runtime->format = params_format(params);
556 runtime->subformat = params_subformat(params);
557 runtime->channels = params_channels(params);
558 runtime->rate = params_rate(params);
559 runtime->period_size = params_period_size(params);
560 runtime->periods = params_periods(params);
561 runtime->buffer_size = params_buffer_size(params);
562 runtime->info = params->info;
563 runtime->rate_num = params->rate_num;
564 runtime->rate_den = params->rate_den;
565 runtime->no_period_wakeup =
566 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
567 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
568
569 bits = snd_pcm_format_physical_width(runtime->format);
570 runtime->sample_bits = bits;
571 bits *= runtime->channels;
572 runtime->frame_bits = bits;
573 frames = 1;
574 while (bits % 8 != 0) {
575 bits *= 2;
576 frames *= 2;
577 }
578 runtime->byte_align = bits / 8;
579 runtime->min_align = frames;
580
581 /* Default sw params */
582 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
583 runtime->period_step = 1;
584 runtime->control->avail_min = runtime->period_size;
585 runtime->start_threshold = 1;
586 runtime->stop_threshold = runtime->buffer_size;
587 runtime->silence_threshold = 0;
588 runtime->silence_size = 0;
589 runtime->boundary = runtime->buffer_size;
590 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
591 runtime->boundary *= 2;
592
593 snd_pcm_timer_resolution_change(substream);
594 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
595
596 if (pm_qos_request_active(&substream->latency_pm_qos_req))
597 pm_qos_remove_request(&substream->latency_pm_qos_req);
598 if ((usecs = period_to_usecs(runtime)) >= 0)
599 pm_qos_add_request(&substream->latency_pm_qos_req,
600 PM_QOS_CPU_DMA_LATENCY, usecs);
601 return 0;
602 _error:
603 /* hardware might be unusable from this time,
604 so we force application to retry to set
605 the correct hardware parameter settings */
606 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
607 if (substream->ops->hw_free != NULL)
608 substream->ops->hw_free(substream);
609 return err;
610}
611
612static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
613 struct snd_pcm_hw_params __user * _params)
614{
615 struct snd_pcm_hw_params *params;
616 int err;
617
618 params = memdup_user(_params, sizeof(*params));
619 if (IS_ERR(params))
620 return PTR_ERR(params);
621
622 err = snd_pcm_hw_params(substream, params);
623 if (copy_to_user(_params, params, sizeof(*params))) {
624 if (!err)
625 err = -EFAULT;
626 }
627
628 kfree(params);
629 return err;
630}
631
632static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
633{
634 struct snd_pcm_runtime *runtime;
635 int result = 0;
636
637 if (PCM_RUNTIME_CHECK(substream))
638 return -ENXIO;
639 runtime = substream->runtime;
640 snd_pcm_stream_lock_irq(substream);
641 switch (runtime->status->state) {
642 case SNDRV_PCM_STATE_SETUP:
643 case SNDRV_PCM_STATE_PREPARED:
644 break;
645 default:
646 snd_pcm_stream_unlock_irq(substream);
647 return -EBADFD;
648 }
649 snd_pcm_stream_unlock_irq(substream);
650 if (atomic_read(&substream->mmap_count))
651 return -EBADFD;
652 if (substream->ops->hw_free)
653 result = substream->ops->hw_free(substream);
654 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
655 pm_qos_remove_request(&substream->latency_pm_qos_req);
656 return result;
657}
658
659static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
660 struct snd_pcm_sw_params *params)
661{
662 struct snd_pcm_runtime *runtime;
663 int err;
664
665 if (PCM_RUNTIME_CHECK(substream))
666 return -ENXIO;
667 runtime = substream->runtime;
668 snd_pcm_stream_lock_irq(substream);
669 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
670 snd_pcm_stream_unlock_irq(substream);
671 return -EBADFD;
672 }
673 snd_pcm_stream_unlock_irq(substream);
674
675 if (params->tstamp_mode < 0 ||
676 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
677 return -EINVAL;
678 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
679 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
680 return -EINVAL;
681 if (params->avail_min == 0)
682 return -EINVAL;
683 if (params->silence_size >= runtime->boundary) {
684 if (params->silence_threshold != 0)
685 return -EINVAL;
686 } else {
687 if (params->silence_size > params->silence_threshold)
688 return -EINVAL;
689 if (params->silence_threshold > runtime->buffer_size)
690 return -EINVAL;
691 }
692 err = 0;
693 snd_pcm_stream_lock_irq(substream);
694 runtime->tstamp_mode = params->tstamp_mode;
695 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
696 runtime->tstamp_type = params->tstamp_type;
697 runtime->period_step = params->period_step;
698 runtime->control->avail_min = params->avail_min;
699 runtime->start_threshold = params->start_threshold;
700 runtime->stop_threshold = params->stop_threshold;
701 runtime->silence_threshold = params->silence_threshold;
702 runtime->silence_size = params->silence_size;
703 params->boundary = runtime->boundary;
704 if (snd_pcm_running(substream)) {
705 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
706 runtime->silence_size > 0)
707 snd_pcm_playback_silence(substream, ULONG_MAX);
708 err = snd_pcm_update_state(substream, runtime);
709 }
710 snd_pcm_stream_unlock_irq(substream);
711 return err;
712}
713
714static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
715 struct snd_pcm_sw_params __user * _params)
716{
717 struct snd_pcm_sw_params params;
718 int err;
719 if (copy_from_user(¶ms, _params, sizeof(params)))
720 return -EFAULT;
721 err = snd_pcm_sw_params(substream, ¶ms);
722 if (copy_to_user(_params, ¶ms, sizeof(params)))
723 return -EFAULT;
724 return err;
725}
726
727int snd_pcm_status(struct snd_pcm_substream *substream,
728 struct snd_pcm_status *status)
729{
730 struct snd_pcm_runtime *runtime = substream->runtime;
731
732 snd_pcm_stream_lock_irq(substream);
733
734 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
735 &runtime->audio_tstamp_config);
736
737 /* backwards compatible behavior */
738 if (runtime->audio_tstamp_config.type_requested ==
739 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
740 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
741 runtime->audio_tstamp_config.type_requested =
742 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
743 else
744 runtime->audio_tstamp_config.type_requested =
745 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
746 runtime->audio_tstamp_report.valid = 0;
747 } else
748 runtime->audio_tstamp_report.valid = 1;
749
750 status->state = runtime->status->state;
751 status->suspended_state = runtime->status->suspended_state;
752 if (status->state == SNDRV_PCM_STATE_OPEN)
753 goto _end;
754 status->trigger_tstamp = runtime->trigger_tstamp;
755 if (snd_pcm_running(substream)) {
756 snd_pcm_update_hw_ptr(substream);
757 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
758 status->tstamp = runtime->status->tstamp;
759 status->driver_tstamp = runtime->driver_tstamp;
760 status->audio_tstamp =
761 runtime->status->audio_tstamp;
762 if (runtime->audio_tstamp_report.valid == 1)
763 /* backwards compatibility, no report provided in COMPAT mode */
764 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
765 &status->audio_tstamp_accuracy,
766 &runtime->audio_tstamp_report);
767
768 goto _tstamp_end;
769 }
770 } else {
771 /* get tstamp only in fallback mode and only if enabled */
772 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
773 snd_pcm_gettime(runtime, &status->tstamp);
774 }
775 _tstamp_end:
776 status->appl_ptr = runtime->control->appl_ptr;
777 status->hw_ptr = runtime->status->hw_ptr;
778 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
779 status->avail = snd_pcm_playback_avail(runtime);
780 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
781 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
782 status->delay = runtime->buffer_size - status->avail;
783 status->delay += runtime->delay;
784 } else
785 status->delay = 0;
786 } else {
787 status->avail = snd_pcm_capture_avail(runtime);
788 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
789 status->delay = status->avail + runtime->delay;
790 else
791 status->delay = 0;
792 }
793 status->avail_max = runtime->avail_max;
794 status->overrange = runtime->overrange;
795 runtime->avail_max = 0;
796 runtime->overrange = 0;
797 _end:
798 snd_pcm_stream_unlock_irq(substream);
799 return 0;
800}
801
802static int snd_pcm_status_user(struct snd_pcm_substream *substream,
803 struct snd_pcm_status __user * _status,
804 bool ext)
805{
806 struct snd_pcm_status status;
807 int res;
808
809 memset(&status, 0, sizeof(status));
810 /*
811 * with extension, parameters are read/write,
812 * get audio_tstamp_data from user,
813 * ignore rest of status structure
814 */
815 if (ext && get_user(status.audio_tstamp_data,
816 (u32 __user *)(&_status->audio_tstamp_data)))
817 return -EFAULT;
818 res = snd_pcm_status(substream, &status);
819 if (res < 0)
820 return res;
821 if (copy_to_user(_status, &status, sizeof(status)))
822 return -EFAULT;
823 return 0;
824}
825
826static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
827 struct snd_pcm_channel_info * info)
828{
829 struct snd_pcm_runtime *runtime;
830 unsigned int channel;
831
832 channel = info->channel;
833 runtime = substream->runtime;
834 snd_pcm_stream_lock_irq(substream);
835 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
836 snd_pcm_stream_unlock_irq(substream);
837 return -EBADFD;
838 }
839 snd_pcm_stream_unlock_irq(substream);
840 if (channel >= runtime->channels)
841 return -EINVAL;
842 memset(info, 0, sizeof(*info));
843 info->channel = channel;
844 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
845}
846
847static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_channel_info __user * _info)
849{
850 struct snd_pcm_channel_info info;
851 int res;
852
853 if (copy_from_user(&info, _info, sizeof(info)))
854 return -EFAULT;
855 res = snd_pcm_channel_info(substream, &info);
856 if (res < 0)
857 return res;
858 if (copy_to_user(_info, &info, sizeof(info)))
859 return -EFAULT;
860 return 0;
861}
862
863static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
864{
865 struct snd_pcm_runtime *runtime = substream->runtime;
866 if (runtime->trigger_master == NULL)
867 return;
868 if (runtime->trigger_master == substream) {
869 if (!runtime->trigger_tstamp_latched)
870 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
871 } else {
872 snd_pcm_trigger_tstamp(runtime->trigger_master);
873 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
874 }
875 runtime->trigger_master = NULL;
876}
877
878struct action_ops {
879 int (*pre_action)(struct snd_pcm_substream *substream, int state);
880 int (*do_action)(struct snd_pcm_substream *substream, int state);
881 void (*undo_action)(struct snd_pcm_substream *substream, int state);
882 void (*post_action)(struct snd_pcm_substream *substream, int state);
883};
884
885/*
886 * this functions is core for handling of linked stream
887 * Note: the stream state might be changed also on failure
888 * Note2: call with calling stream lock + link lock
889 */
890static int snd_pcm_action_group(const struct action_ops *ops,
891 struct snd_pcm_substream *substream,
892 int state, int do_lock)
893{
894 struct snd_pcm_substream *s = NULL;
895 struct snd_pcm_substream *s1;
896 int res = 0, depth = 1;
897
898 snd_pcm_group_for_each_entry(s, substream) {
899 if (do_lock && s != substream) {
900 if (s->pcm->nonatomic)
901 mutex_lock_nested(&s->self_group.mutex, depth);
902 else
903 spin_lock_nested(&s->self_group.lock, depth);
904 depth++;
905 }
906 res = ops->pre_action(s, state);
907 if (res < 0)
908 goto _unlock;
909 }
910 snd_pcm_group_for_each_entry(s, substream) {
911 res = ops->do_action(s, state);
912 if (res < 0) {
913 if (ops->undo_action) {
914 snd_pcm_group_for_each_entry(s1, substream) {
915 if (s1 == s) /* failed stream */
916 break;
917 ops->undo_action(s1, state);
918 }
919 }
920 s = NULL; /* unlock all */
921 goto _unlock;
922 }
923 }
924 snd_pcm_group_for_each_entry(s, substream) {
925 ops->post_action(s, state);
926 }
927 _unlock:
928 if (do_lock) {
929 /* unlock streams */
930 snd_pcm_group_for_each_entry(s1, substream) {
931 if (s1 != substream) {
932 if (s1->pcm->nonatomic)
933 mutex_unlock(&s1->self_group.mutex);
934 else
935 spin_unlock(&s1->self_group.lock);
936 }
937 if (s1 == s) /* end */
938 break;
939 }
940 }
941 return res;
942}
943
944/*
945 * Note: call with stream lock
946 */
947static int snd_pcm_action_single(const struct action_ops *ops,
948 struct snd_pcm_substream *substream,
949 int state)
950{
951 int res;
952
953 res = ops->pre_action(substream, state);
954 if (res < 0)
955 return res;
956 res = ops->do_action(substream, state);
957 if (res == 0)
958 ops->post_action(substream, state);
959 else if (ops->undo_action)
960 ops->undo_action(substream, state);
961 return res;
962}
963
964/*
965 * Note: call with stream lock
966 */
967static int snd_pcm_action(const struct action_ops *ops,
968 struct snd_pcm_substream *substream,
969 int state)
970{
971 int res;
972
973 if (!snd_pcm_stream_linked(substream))
974 return snd_pcm_action_single(ops, substream, state);
975
976 if (substream->pcm->nonatomic) {
977 if (!mutex_trylock(&substream->group->mutex)) {
978 mutex_unlock(&substream->self_group.mutex);
979 mutex_lock(&substream->group->mutex);
980 mutex_lock(&substream->self_group.mutex);
981 }
982 res = snd_pcm_action_group(ops, substream, state, 1);
983 mutex_unlock(&substream->group->mutex);
984 } else {
985 if (!spin_trylock(&substream->group->lock)) {
986 spin_unlock(&substream->self_group.lock);
987 spin_lock(&substream->group->lock);
988 spin_lock(&substream->self_group.lock);
989 }
990 res = snd_pcm_action_group(ops, substream, state, 1);
991 spin_unlock(&substream->group->lock);
992 }
993 return res;
994}
995
996/*
997 * Note: don't use any locks before
998 */
999static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1000 struct snd_pcm_substream *substream,
1001 int state)
1002{
1003 int res;
1004
1005 snd_pcm_stream_lock_irq(substream);
1006 res = snd_pcm_action(ops, substream, state);
1007 snd_pcm_stream_unlock_irq(substream);
1008 return res;
1009}
1010
1011/*
1012 */
1013static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1014 struct snd_pcm_substream *substream,
1015 int state)
1016{
1017 int res;
1018
1019 down_read(&snd_pcm_link_rwsem);
1020 if (snd_pcm_stream_linked(substream))
1021 res = snd_pcm_action_group(ops, substream, state, 0);
1022 else
1023 res = snd_pcm_action_single(ops, substream, state);
1024 up_read(&snd_pcm_link_rwsem);
1025 return res;
1026}
1027
1028/*
1029 * start callbacks
1030 */
1031static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1032{
1033 struct snd_pcm_runtime *runtime = substream->runtime;
1034 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1035 return -EBADFD;
1036 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1037 !snd_pcm_playback_data(substream))
1038 return -EPIPE;
1039 runtime->trigger_tstamp_latched = false;
1040 runtime->trigger_master = substream;
1041 return 0;
1042}
1043
1044static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1045{
1046 if (substream->runtime->trigger_master != substream)
1047 return 0;
1048 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1049}
1050
1051static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1052{
1053 if (substream->runtime->trigger_master == substream)
1054 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1055}
1056
1057static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1058{
1059 struct snd_pcm_runtime *runtime = substream->runtime;
1060 snd_pcm_trigger_tstamp(substream);
1061 runtime->hw_ptr_jiffies = jiffies;
1062 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1063 runtime->rate;
1064 runtime->status->state = state;
1065 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1066 runtime->silence_size > 0)
1067 snd_pcm_playback_silence(substream, ULONG_MAX);
1068 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1069}
1070
1071static const struct action_ops snd_pcm_action_start = {
1072 .pre_action = snd_pcm_pre_start,
1073 .do_action = snd_pcm_do_start,
1074 .undo_action = snd_pcm_undo_start,
1075 .post_action = snd_pcm_post_start
1076};
1077
1078/**
1079 * snd_pcm_start - start all linked streams
1080 * @substream: the PCM substream instance
1081 *
1082 * Return: Zero if successful, or a negative error code.
1083 */
1084int snd_pcm_start(struct snd_pcm_substream *substream)
1085{
1086 return snd_pcm_action(&snd_pcm_action_start, substream,
1087 SNDRV_PCM_STATE_RUNNING);
1088}
1089
1090/*
1091 * stop callbacks
1092 */
1093static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1094{
1095 struct snd_pcm_runtime *runtime = substream->runtime;
1096 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1097 return -EBADFD;
1098 runtime->trigger_master = substream;
1099 return 0;
1100}
1101
1102static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1103{
1104 if (substream->runtime->trigger_master == substream &&
1105 snd_pcm_running(substream))
1106 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1107 return 0; /* unconditonally stop all substreams */
1108}
1109
1110static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1111{
1112 struct snd_pcm_runtime *runtime = substream->runtime;
1113 if (runtime->status->state != state) {
1114 snd_pcm_trigger_tstamp(substream);
1115 runtime->status->state = state;
1116 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1117 }
1118 wake_up(&runtime->sleep);
1119 wake_up(&runtime->tsleep);
1120}
1121
1122static const struct action_ops snd_pcm_action_stop = {
1123 .pre_action = snd_pcm_pre_stop,
1124 .do_action = snd_pcm_do_stop,
1125 .post_action = snd_pcm_post_stop
1126};
1127
1128/**
1129 * snd_pcm_stop - try to stop all running streams in the substream group
1130 * @substream: the PCM substream instance
1131 * @state: PCM state after stopping the stream
1132 *
1133 * The state of each stream is then changed to the given state unconditionally.
1134 *
1135 * Return: Zero if successful, or a negative error code.
1136 */
1137int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1138{
1139 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1140}
1141
1142EXPORT_SYMBOL(snd_pcm_stop);
1143
1144/**
1145 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1146 * @substream: the PCM substream
1147 *
1148 * After stopping, the state is changed to SETUP.
1149 * Unlike snd_pcm_stop(), this affects only the given stream.
1150 *
1151 * Return: Zero if succesful, or a negative error code.
1152 */
1153int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1154{
1155 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1156 SNDRV_PCM_STATE_SETUP);
1157}
1158
1159/**
1160 * snd_pcm_stop_xrun - stop the running streams as XRUN
1161 * @substream: the PCM substream instance
1162 *
1163 * This stops the given running substream (and all linked substreams) as XRUN.
1164 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1165 *
1166 * Return: Zero if successful, or a negative error code.
1167 */
1168int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1169{
1170 unsigned long flags;
1171 int ret = 0;
1172
1173 snd_pcm_stream_lock_irqsave(substream, flags);
1174 if (snd_pcm_running(substream))
1175 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1176 snd_pcm_stream_unlock_irqrestore(substream, flags);
1177 return ret;
1178}
1179EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1180
1181/*
1182 * pause callbacks
1183 */
1184static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1185{
1186 struct snd_pcm_runtime *runtime = substream->runtime;
1187 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1188 return -ENOSYS;
1189 if (push) {
1190 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1191 return -EBADFD;
1192 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1193 return -EBADFD;
1194 runtime->trigger_master = substream;
1195 return 0;
1196}
1197
1198static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1199{
1200 if (substream->runtime->trigger_master != substream)
1201 return 0;
1202 /* some drivers might use hw_ptr to recover from the pause -
1203 update the hw_ptr now */
1204 if (push)
1205 snd_pcm_update_hw_ptr(substream);
1206 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1207 * a delta between the current jiffies, this gives a large enough
1208 * delta, effectively to skip the check once.
1209 */
1210 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1211 return substream->ops->trigger(substream,
1212 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1213 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1214}
1215
1216static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1217{
1218 if (substream->runtime->trigger_master == substream)
1219 substream->ops->trigger(substream,
1220 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1221 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1222}
1223
1224static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1225{
1226 struct snd_pcm_runtime *runtime = substream->runtime;
1227 snd_pcm_trigger_tstamp(substream);
1228 if (push) {
1229 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1230 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1231 wake_up(&runtime->sleep);
1232 wake_up(&runtime->tsleep);
1233 } else {
1234 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1235 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1236 }
1237}
1238
1239static const struct action_ops snd_pcm_action_pause = {
1240 .pre_action = snd_pcm_pre_pause,
1241 .do_action = snd_pcm_do_pause,
1242 .undo_action = snd_pcm_undo_pause,
1243 .post_action = snd_pcm_post_pause
1244};
1245
1246/*
1247 * Push/release the pause for all linked streams.
1248 */
1249static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1250{
1251 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1252}
1253
1254#ifdef CONFIG_PM
1255/* suspend */
1256
1257static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1258{
1259 struct snd_pcm_runtime *runtime = substream->runtime;
1260 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1261 return -EBUSY;
1262 runtime->trigger_master = substream;
1263 return 0;
1264}
1265
1266static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1267{
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 if (runtime->trigger_master != substream)
1270 return 0;
1271 if (! snd_pcm_running(substream))
1272 return 0;
1273 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1274 return 0; /* suspend unconditionally */
1275}
1276
1277static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1278{
1279 struct snd_pcm_runtime *runtime = substream->runtime;
1280 snd_pcm_trigger_tstamp(substream);
1281 runtime->status->suspended_state = runtime->status->state;
1282 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1283 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1284 wake_up(&runtime->sleep);
1285 wake_up(&runtime->tsleep);
1286}
1287
1288static const struct action_ops snd_pcm_action_suspend = {
1289 .pre_action = snd_pcm_pre_suspend,
1290 .do_action = snd_pcm_do_suspend,
1291 .post_action = snd_pcm_post_suspend
1292};
1293
1294/**
1295 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1296 * @substream: the PCM substream
1297 *
1298 * After this call, all streams are changed to SUSPENDED state.
1299 *
1300 * Return: Zero if successful (or @substream is %NULL), or a negative error
1301 * code.
1302 */
1303int snd_pcm_suspend(struct snd_pcm_substream *substream)
1304{
1305 int err;
1306 unsigned long flags;
1307
1308 if (! substream)
1309 return 0;
1310
1311 snd_pcm_stream_lock_irqsave(substream, flags);
1312 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1313 snd_pcm_stream_unlock_irqrestore(substream, flags);
1314 return err;
1315}
1316
1317EXPORT_SYMBOL(snd_pcm_suspend);
1318
1319/**
1320 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1321 * @pcm: the PCM instance
1322 *
1323 * After this call, all streams are changed to SUSPENDED state.
1324 *
1325 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1326 */
1327int snd_pcm_suspend_all(struct snd_pcm *pcm)
1328{
1329 struct snd_pcm_substream *substream;
1330 int stream, err = 0;
1331
1332 if (! pcm)
1333 return 0;
1334
1335 for (stream = 0; stream < 2; stream++) {
1336 for (substream = pcm->streams[stream].substream;
1337 substream; substream = substream->next) {
1338 /* FIXME: the open/close code should lock this as well */
1339 if (substream->runtime == NULL)
1340 continue;
1341 err = snd_pcm_suspend(substream);
1342 if (err < 0 && err != -EBUSY)
1343 return err;
1344 }
1345 }
1346 return 0;
1347}
1348
1349EXPORT_SYMBOL(snd_pcm_suspend_all);
1350
1351/* resume */
1352
1353static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1354{
1355 struct snd_pcm_runtime *runtime = substream->runtime;
1356 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1357 return -ENOSYS;
1358 runtime->trigger_master = substream;
1359 return 0;
1360}
1361
1362static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1363{
1364 struct snd_pcm_runtime *runtime = substream->runtime;
1365 if (runtime->trigger_master != substream)
1366 return 0;
1367 /* DMA not running previously? */
1368 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1369 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1370 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1371 return 0;
1372 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1373}
1374
1375static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1376{
1377 if (substream->runtime->trigger_master == substream &&
1378 snd_pcm_running(substream))
1379 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1380}
1381
1382static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1383{
1384 struct snd_pcm_runtime *runtime = substream->runtime;
1385 snd_pcm_trigger_tstamp(substream);
1386 runtime->status->state = runtime->status->suspended_state;
1387 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1388}
1389
1390static const struct action_ops snd_pcm_action_resume = {
1391 .pre_action = snd_pcm_pre_resume,
1392 .do_action = snd_pcm_do_resume,
1393 .undo_action = snd_pcm_undo_resume,
1394 .post_action = snd_pcm_post_resume
1395};
1396
1397static int snd_pcm_resume(struct snd_pcm_substream *substream)
1398{
1399 struct snd_card *card = substream->pcm->card;
1400 int res;
1401
1402 snd_power_lock(card);
1403 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1404 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1405 snd_power_unlock(card);
1406 return res;
1407}
1408
1409#else
1410
1411static int snd_pcm_resume(struct snd_pcm_substream *substream)
1412{
1413 return -ENOSYS;
1414}
1415
1416#endif /* CONFIG_PM */
1417
1418/*
1419 * xrun ioctl
1420 *
1421 * Change the RUNNING stream(s) to XRUN state.
1422 */
1423static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1424{
1425 struct snd_card *card = substream->pcm->card;
1426 struct snd_pcm_runtime *runtime = substream->runtime;
1427 int result;
1428
1429 snd_power_lock(card);
1430 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1432 if (result < 0)
1433 goto _unlock;
1434 }
1435
1436 snd_pcm_stream_lock_irq(substream);
1437 switch (runtime->status->state) {
1438 case SNDRV_PCM_STATE_XRUN:
1439 result = 0; /* already there */
1440 break;
1441 case SNDRV_PCM_STATE_RUNNING:
1442 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1443 break;
1444 default:
1445 result = -EBADFD;
1446 }
1447 snd_pcm_stream_unlock_irq(substream);
1448 _unlock:
1449 snd_power_unlock(card);
1450 return result;
1451}
1452
1453/*
1454 * reset ioctl
1455 */
1456static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1457{
1458 struct snd_pcm_runtime *runtime = substream->runtime;
1459 switch (runtime->status->state) {
1460 case SNDRV_PCM_STATE_RUNNING:
1461 case SNDRV_PCM_STATE_PREPARED:
1462 case SNDRV_PCM_STATE_PAUSED:
1463 case SNDRV_PCM_STATE_SUSPENDED:
1464 return 0;
1465 default:
1466 return -EBADFD;
1467 }
1468}
1469
1470static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1471{
1472 struct snd_pcm_runtime *runtime = substream->runtime;
1473 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1474 if (err < 0)
1475 return err;
1476 runtime->hw_ptr_base = 0;
1477 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1478 runtime->status->hw_ptr % runtime->period_size;
1479 runtime->silence_start = runtime->status->hw_ptr;
1480 runtime->silence_filled = 0;
1481 return 0;
1482}
1483
1484static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1485{
1486 struct snd_pcm_runtime *runtime = substream->runtime;
1487 runtime->control->appl_ptr = runtime->status->hw_ptr;
1488 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1489 runtime->silence_size > 0)
1490 snd_pcm_playback_silence(substream, ULONG_MAX);
1491}
1492
1493static const struct action_ops snd_pcm_action_reset = {
1494 .pre_action = snd_pcm_pre_reset,
1495 .do_action = snd_pcm_do_reset,
1496 .post_action = snd_pcm_post_reset
1497};
1498
1499static int snd_pcm_reset(struct snd_pcm_substream *substream)
1500{
1501 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1502}
1503
1504/*
1505 * prepare ioctl
1506 */
1507/* we use the second argument for updating f_flags */
1508static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1509 int f_flags)
1510{
1511 struct snd_pcm_runtime *runtime = substream->runtime;
1512 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1513 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1514 return -EBADFD;
1515 if (snd_pcm_running(substream))
1516 return -EBUSY;
1517 substream->f_flags = f_flags;
1518 return 0;
1519}
1520
1521static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1522{
1523 int err;
1524 err = substream->ops->prepare(substream);
1525 if (err < 0)
1526 return err;
1527 return snd_pcm_do_reset(substream, 0);
1528}
1529
1530static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1531{
1532 struct snd_pcm_runtime *runtime = substream->runtime;
1533 runtime->control->appl_ptr = runtime->status->hw_ptr;
1534 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1535}
1536
1537static const struct action_ops snd_pcm_action_prepare = {
1538 .pre_action = snd_pcm_pre_prepare,
1539 .do_action = snd_pcm_do_prepare,
1540 .post_action = snd_pcm_post_prepare
1541};
1542
1543/**
1544 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1545 * @substream: the PCM substream instance
1546 * @file: file to refer f_flags
1547 *
1548 * Return: Zero if successful, or a negative error code.
1549 */
1550static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1551 struct file *file)
1552{
1553 int res;
1554 struct snd_card *card = substream->pcm->card;
1555 int f_flags;
1556
1557 if (file)
1558 f_flags = file->f_flags;
1559 else
1560 f_flags = substream->f_flags;
1561
1562 snd_power_lock(card);
1563 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1564 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1565 substream, f_flags);
1566 snd_power_unlock(card);
1567 return res;
1568}
1569
1570/*
1571 * drain ioctl
1572 */
1573
1574static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1575{
1576 struct snd_pcm_runtime *runtime = substream->runtime;
1577 switch (runtime->status->state) {
1578 case SNDRV_PCM_STATE_OPEN:
1579 case SNDRV_PCM_STATE_DISCONNECTED:
1580 case SNDRV_PCM_STATE_SUSPENDED:
1581 return -EBADFD;
1582 }
1583 runtime->trigger_master = substream;
1584 return 0;
1585}
1586
1587static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1588{
1589 struct snd_pcm_runtime *runtime = substream->runtime;
1590 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1591 switch (runtime->status->state) {
1592 case SNDRV_PCM_STATE_PREPARED:
1593 /* start playback stream if possible */
1594 if (! snd_pcm_playback_empty(substream)) {
1595 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1596 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1597 } else {
1598 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1599 }
1600 break;
1601 case SNDRV_PCM_STATE_RUNNING:
1602 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1603 break;
1604 case SNDRV_PCM_STATE_XRUN:
1605 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1606 break;
1607 default:
1608 break;
1609 }
1610 } else {
1611 /* stop running stream */
1612 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1613 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1614 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1615 snd_pcm_do_stop(substream, new_state);
1616 snd_pcm_post_stop(substream, new_state);
1617 }
1618 }
1619
1620 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1621 runtime->trigger_master == substream &&
1622 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1623 return substream->ops->trigger(substream,
1624 SNDRV_PCM_TRIGGER_DRAIN);
1625
1626 return 0;
1627}
1628
1629static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1630{
1631}
1632
1633static const struct action_ops snd_pcm_action_drain_init = {
1634 .pre_action = snd_pcm_pre_drain_init,
1635 .do_action = snd_pcm_do_drain_init,
1636 .post_action = snd_pcm_post_drain_init
1637};
1638
1639static int snd_pcm_drop(struct snd_pcm_substream *substream);
1640
1641/*
1642 * Drain the stream(s).
1643 * When the substream is linked, sync until the draining of all playback streams
1644 * is finished.
1645 * After this call, all streams are supposed to be either SETUP or DRAINING
1646 * (capture only) state.
1647 */
1648static int snd_pcm_drain(struct snd_pcm_substream *substream,
1649 struct file *file)
1650{
1651 struct snd_card *card;
1652 struct snd_pcm_runtime *runtime;
1653 struct snd_pcm_substream *s;
1654 wait_queue_t wait;
1655 int result = 0;
1656 int nonblock = 0;
1657
1658 card = substream->pcm->card;
1659 runtime = substream->runtime;
1660
1661 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1662 return -EBADFD;
1663
1664 snd_power_lock(card);
1665 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1666 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1667 if (result < 0) {
1668 snd_power_unlock(card);
1669 return result;
1670 }
1671 }
1672
1673 if (file) {
1674 if (file->f_flags & O_NONBLOCK)
1675 nonblock = 1;
1676 } else if (substream->f_flags & O_NONBLOCK)
1677 nonblock = 1;
1678
1679 down_read(&snd_pcm_link_rwsem);
1680 snd_pcm_stream_lock_irq(substream);
1681 /* resume pause */
1682 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1683 snd_pcm_pause(substream, 0);
1684
1685 /* pre-start/stop - all running streams are changed to DRAINING state */
1686 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1687 if (result < 0)
1688 goto unlock;
1689 /* in non-blocking, we don't wait in ioctl but let caller poll */
1690 if (nonblock) {
1691 result = -EAGAIN;
1692 goto unlock;
1693 }
1694
1695 for (;;) {
1696 long tout;
1697 struct snd_pcm_runtime *to_check;
1698 if (signal_pending(current)) {
1699 result = -ERESTARTSYS;
1700 break;
1701 }
1702 /* find a substream to drain */
1703 to_check = NULL;
1704 snd_pcm_group_for_each_entry(s, substream) {
1705 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1706 continue;
1707 runtime = s->runtime;
1708 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1709 to_check = runtime;
1710 break;
1711 }
1712 }
1713 if (!to_check)
1714 break; /* all drained */
1715 init_waitqueue_entry(&wait, current);
1716 add_wait_queue(&to_check->sleep, &wait);
1717 snd_pcm_stream_unlock_irq(substream);
1718 up_read(&snd_pcm_link_rwsem);
1719 snd_power_unlock(card);
1720 if (runtime->no_period_wakeup)
1721 tout = MAX_SCHEDULE_TIMEOUT;
1722 else {
1723 tout = 10;
1724 if (runtime->rate) {
1725 long t = runtime->period_size * 2 / runtime->rate;
1726 tout = max(t, tout);
1727 }
1728 tout = msecs_to_jiffies(tout * 1000);
1729 }
1730 tout = schedule_timeout_interruptible(tout);
1731 snd_power_lock(card);
1732 down_read(&snd_pcm_link_rwsem);
1733 snd_pcm_stream_lock_irq(substream);
1734 remove_wait_queue(&to_check->sleep, &wait);
1735 if (card->shutdown) {
1736 result = -ENODEV;
1737 break;
1738 }
1739 if (tout == 0) {
1740 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1741 result = -ESTRPIPE;
1742 else {
1743 dev_dbg(substream->pcm->card->dev,
1744 "playback drain error (DMA or IRQ trouble?)\n");
1745 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1746 result = -EIO;
1747 }
1748 break;
1749 }
1750 }
1751
1752 unlock:
1753 snd_pcm_stream_unlock_irq(substream);
1754 up_read(&snd_pcm_link_rwsem);
1755 snd_power_unlock(card);
1756
1757 return result;
1758}
1759
1760/*
1761 * drop ioctl
1762 *
1763 * Immediately put all linked substreams into SETUP state.
1764 */
1765static int snd_pcm_drop(struct snd_pcm_substream *substream)
1766{
1767 struct snd_pcm_runtime *runtime;
1768 int result = 0;
1769
1770 if (PCM_RUNTIME_CHECK(substream))
1771 return -ENXIO;
1772 runtime = substream->runtime;
1773
1774 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1775 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1776 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1777 return -EBADFD;
1778
1779 snd_pcm_stream_lock_irq(substream);
1780 /* resume pause */
1781 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1782 snd_pcm_pause(substream, 0);
1783
1784 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1785 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1786 snd_pcm_stream_unlock_irq(substream);
1787
1788 return result;
1789}
1790
1791
1792static bool is_pcm_file(struct file *file)
1793{
1794 struct inode *inode = file_inode(file);
1795 unsigned int minor;
1796
1797 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1798 return false;
1799 minor = iminor(inode);
1800 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1801 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1802}
1803
1804/*
1805 * PCM link handling
1806 */
1807static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1808{
1809 int res = 0;
1810 struct snd_pcm_file *pcm_file;
1811 struct snd_pcm_substream *substream1;
1812 struct snd_pcm_group *group;
1813 struct fd f = fdget(fd);
1814
1815 if (!f.file)
1816 return -EBADFD;
1817 if (!is_pcm_file(f.file)) {
1818 res = -EBADFD;
1819 goto _badf;
1820 }
1821 pcm_file = f.file->private_data;
1822 substream1 = pcm_file->substream;
1823 group = kmalloc(sizeof(*group), GFP_KERNEL);
1824 if (!group) {
1825 res = -ENOMEM;
1826 goto _nolock;
1827 }
1828 down_write_nonblock(&snd_pcm_link_rwsem);
1829 write_lock_irq(&snd_pcm_link_rwlock);
1830 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1831 substream->runtime->status->state != substream1->runtime->status->state ||
1832 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1833 res = -EBADFD;
1834 goto _end;
1835 }
1836 if (snd_pcm_stream_linked(substream1)) {
1837 res = -EALREADY;
1838 goto _end;
1839 }
1840 if (!snd_pcm_stream_linked(substream)) {
1841 substream->group = group;
1842 group = NULL;
1843 spin_lock_init(&substream->group->lock);
1844 mutex_init(&substream->group->mutex);
1845 INIT_LIST_HEAD(&substream->group->substreams);
1846 list_add_tail(&substream->link_list, &substream->group->substreams);
1847 substream->group->count = 1;
1848 }
1849 list_add_tail(&substream1->link_list, &substream->group->substreams);
1850 substream->group->count++;
1851 substream1->group = substream->group;
1852 _end:
1853 write_unlock_irq(&snd_pcm_link_rwlock);
1854 up_write(&snd_pcm_link_rwsem);
1855 _nolock:
1856 snd_card_unref(substream1->pcm->card);
1857 kfree(group);
1858 _badf:
1859 fdput(f);
1860 return res;
1861}
1862
1863static void relink_to_local(struct snd_pcm_substream *substream)
1864{
1865 substream->group = &substream->self_group;
1866 INIT_LIST_HEAD(&substream->self_group.substreams);
1867 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1868}
1869
1870static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1871{
1872 struct snd_pcm_substream *s;
1873 int res = 0;
1874
1875 down_write_nonblock(&snd_pcm_link_rwsem);
1876 write_lock_irq(&snd_pcm_link_rwlock);
1877 if (!snd_pcm_stream_linked(substream)) {
1878 res = -EALREADY;
1879 goto _end;
1880 }
1881 list_del(&substream->link_list);
1882 substream->group->count--;
1883 if (substream->group->count == 1) { /* detach the last stream, too */
1884 snd_pcm_group_for_each_entry(s, substream) {
1885 relink_to_local(s);
1886 break;
1887 }
1888 kfree(substream->group);
1889 }
1890 relink_to_local(substream);
1891 _end:
1892 write_unlock_irq(&snd_pcm_link_rwlock);
1893 up_write(&snd_pcm_link_rwsem);
1894 return res;
1895}
1896
1897/*
1898 * hw configurator
1899 */
1900static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1901 struct snd_pcm_hw_rule *rule)
1902{
1903 struct snd_interval t;
1904 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1905 hw_param_interval_c(params, rule->deps[1]), &t);
1906 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1907}
1908
1909static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1910 struct snd_pcm_hw_rule *rule)
1911{
1912 struct snd_interval t;
1913 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1914 hw_param_interval_c(params, rule->deps[1]), &t);
1915 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1916}
1917
1918static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1919 struct snd_pcm_hw_rule *rule)
1920{
1921 struct snd_interval t;
1922 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1923 hw_param_interval_c(params, rule->deps[1]),
1924 (unsigned long) rule->private, &t);
1925 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1926}
1927
1928static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1929 struct snd_pcm_hw_rule *rule)
1930{
1931 struct snd_interval t;
1932 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1933 (unsigned long) rule->private,
1934 hw_param_interval_c(params, rule->deps[1]), &t);
1935 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1936}
1937
1938static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1939 struct snd_pcm_hw_rule *rule)
1940{
1941 unsigned int k;
1942 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1943 struct snd_mask m;
1944 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1945 snd_mask_any(&m);
1946 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1947 int bits;
1948 if (! snd_mask_test(mask, k))
1949 continue;
1950 bits = snd_pcm_format_physical_width(k);
1951 if (bits <= 0)
1952 continue; /* ignore invalid formats */
1953 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1954 snd_mask_reset(&m, k);
1955 }
1956 return snd_mask_refine(mask, &m);
1957}
1958
1959static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1960 struct snd_pcm_hw_rule *rule)
1961{
1962 struct snd_interval t;
1963 unsigned int k;
1964 t.min = UINT_MAX;
1965 t.max = 0;
1966 t.openmin = 0;
1967 t.openmax = 0;
1968 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1969 int bits;
1970 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1971 continue;
1972 bits = snd_pcm_format_physical_width(k);
1973 if (bits <= 0)
1974 continue; /* ignore invalid formats */
1975 if (t.min > (unsigned)bits)
1976 t.min = bits;
1977 if (t.max < (unsigned)bits)
1978 t.max = bits;
1979 }
1980 t.integer = 1;
1981 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1982}
1983
1984#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1985#error "Change this table"
1986#endif
1987
1988static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1989 48000, 64000, 88200, 96000, 176400, 192000 };
1990
1991const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1992 .count = ARRAY_SIZE(rates),
1993 .list = rates,
1994};
1995
1996static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1997 struct snd_pcm_hw_rule *rule)
1998{
1999 struct snd_pcm_hardware *hw = rule->private;
2000 return snd_interval_list(hw_param_interval(params, rule->var),
2001 snd_pcm_known_rates.count,
2002 snd_pcm_known_rates.list, hw->rates);
2003}
2004
2005static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2006 struct snd_pcm_hw_rule *rule)
2007{
2008 struct snd_interval t;
2009 struct snd_pcm_substream *substream = rule->private;
2010 t.min = 0;
2011 t.max = substream->buffer_bytes_max;
2012 t.openmin = 0;
2013 t.openmax = 0;
2014 t.integer = 1;
2015 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2016}
2017
2018int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2019{
2020 struct snd_pcm_runtime *runtime = substream->runtime;
2021 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2022 int k, err;
2023
2024 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2025 snd_mask_any(constrs_mask(constrs, k));
2026 }
2027
2028 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2029 snd_interval_any(constrs_interval(constrs, k));
2030 }
2031
2032 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2033 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2034 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2035 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2036 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2037
2038 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2039 snd_pcm_hw_rule_format, NULL,
2040 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2041 if (err < 0)
2042 return err;
2043 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2044 snd_pcm_hw_rule_sample_bits, NULL,
2045 SNDRV_PCM_HW_PARAM_FORMAT,
2046 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2047 if (err < 0)
2048 return err;
2049 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2050 snd_pcm_hw_rule_div, NULL,
2051 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2052 if (err < 0)
2053 return err;
2054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2055 snd_pcm_hw_rule_mul, NULL,
2056 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2057 if (err < 0)
2058 return err;
2059 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2060 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2061 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2062 if (err < 0)
2063 return err;
2064 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2065 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2066 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2067 if (err < 0)
2068 return err;
2069 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2070 snd_pcm_hw_rule_div, NULL,
2071 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2072 if (err < 0)
2073 return err;
2074 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2075 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2076 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2077 if (err < 0)
2078 return err;
2079 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2080 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2081 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2082 if (err < 0)
2083 return err;
2084 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2085 snd_pcm_hw_rule_div, NULL,
2086 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2087 if (err < 0)
2088 return err;
2089 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2090 snd_pcm_hw_rule_div, NULL,
2091 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2092 if (err < 0)
2093 return err;
2094 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2095 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2096 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2097 if (err < 0)
2098 return err;
2099 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2100 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2101 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2102 if (err < 0)
2103 return err;
2104 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2105 snd_pcm_hw_rule_mul, NULL,
2106 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2107 if (err < 0)
2108 return err;
2109 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2110 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2111 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2112 if (err < 0)
2113 return err;
2114 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2115 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2116 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2117 if (err < 0)
2118 return err;
2119 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2120 snd_pcm_hw_rule_muldivk, (void*) 8,
2121 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2122 if (err < 0)
2123 return err;
2124 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2125 snd_pcm_hw_rule_muldivk, (void*) 8,
2126 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2127 if (err < 0)
2128 return err;
2129 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2130 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2131 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2132 if (err < 0)
2133 return err;
2134 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2135 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2136 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2137 if (err < 0)
2138 return err;
2139 return 0;
2140}
2141
2142int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2143{
2144 struct snd_pcm_runtime *runtime = substream->runtime;
2145 struct snd_pcm_hardware *hw = &runtime->hw;
2146 int err;
2147 unsigned int mask = 0;
2148
2149 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2150 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2151 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2152 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2153 if (hw_support_mmap(substream)) {
2154 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2155 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2156 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2157 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2158 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2159 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2160 }
2161 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2162 if (err < 0)
2163 return err;
2164
2165 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2166 if (err < 0)
2167 return err;
2168
2169 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2170 if (err < 0)
2171 return err;
2172
2173 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2174 hw->channels_min, hw->channels_max);
2175 if (err < 0)
2176 return err;
2177
2178 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2179 hw->rate_min, hw->rate_max);
2180 if (err < 0)
2181 return err;
2182
2183 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2184 hw->period_bytes_min, hw->period_bytes_max);
2185 if (err < 0)
2186 return err;
2187
2188 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2189 hw->periods_min, hw->periods_max);
2190 if (err < 0)
2191 return err;
2192
2193 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2194 hw->period_bytes_min, hw->buffer_bytes_max);
2195 if (err < 0)
2196 return err;
2197
2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2199 snd_pcm_hw_rule_buffer_bytes_max, substream,
2200 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2201 if (err < 0)
2202 return err;
2203
2204 /* FIXME: remove */
2205 if (runtime->dma_bytes) {
2206 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2207 if (err < 0)
2208 return err;
2209 }
2210
2211 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2212 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2213 snd_pcm_hw_rule_rate, hw,
2214 SNDRV_PCM_HW_PARAM_RATE, -1);
2215 if (err < 0)
2216 return err;
2217 }
2218
2219 /* FIXME: this belong to lowlevel */
2220 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2221
2222 return 0;
2223}
2224
2225static void pcm_release_private(struct snd_pcm_substream *substream)
2226{
2227 snd_pcm_unlink(substream);
2228}
2229
2230void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2231{
2232 substream->ref_count--;
2233 if (substream->ref_count > 0)
2234 return;
2235
2236 snd_pcm_drop(substream);
2237 if (substream->hw_opened) {
2238 if (substream->ops->hw_free &&
2239 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2240 substream->ops->hw_free(substream);
2241 substream->ops->close(substream);
2242 substream->hw_opened = 0;
2243 }
2244 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2245 pm_qos_remove_request(&substream->latency_pm_qos_req);
2246 if (substream->pcm_release) {
2247 substream->pcm_release(substream);
2248 substream->pcm_release = NULL;
2249 }
2250 snd_pcm_detach_substream(substream);
2251}
2252
2253EXPORT_SYMBOL(snd_pcm_release_substream);
2254
2255int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2256 struct file *file,
2257 struct snd_pcm_substream **rsubstream)
2258{
2259 struct snd_pcm_substream *substream;
2260 int err;
2261
2262 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2263 if (err < 0)
2264 return err;
2265 if (substream->ref_count > 1) {
2266 *rsubstream = substream;
2267 return 0;
2268 }
2269
2270 err = snd_pcm_hw_constraints_init(substream);
2271 if (err < 0) {
2272 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2273 goto error;
2274 }
2275
2276 if ((err = substream->ops->open(substream)) < 0)
2277 goto error;
2278
2279 substream->hw_opened = 1;
2280
2281 err = snd_pcm_hw_constraints_complete(substream);
2282 if (err < 0) {
2283 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2284 goto error;
2285 }
2286
2287 *rsubstream = substream;
2288 return 0;
2289
2290 error:
2291 snd_pcm_release_substream(substream);
2292 return err;
2293}
2294
2295EXPORT_SYMBOL(snd_pcm_open_substream);
2296
2297static int snd_pcm_open_file(struct file *file,
2298 struct snd_pcm *pcm,
2299 int stream)
2300{
2301 struct snd_pcm_file *pcm_file;
2302 struct snd_pcm_substream *substream;
2303 int err;
2304
2305 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2306 if (err < 0)
2307 return err;
2308
2309 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2310 if (pcm_file == NULL) {
2311 snd_pcm_release_substream(substream);
2312 return -ENOMEM;
2313 }
2314 pcm_file->substream = substream;
2315 if (substream->ref_count == 1) {
2316 substream->file = pcm_file;
2317 substream->pcm_release = pcm_release_private;
2318 }
2319 file->private_data = pcm_file;
2320
2321 return 0;
2322}
2323
2324static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2325{
2326 struct snd_pcm *pcm;
2327 int err = nonseekable_open(inode, file);
2328 if (err < 0)
2329 return err;
2330 pcm = snd_lookup_minor_data(iminor(inode),
2331 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2332 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2333 if (pcm)
2334 snd_card_unref(pcm->card);
2335 return err;
2336}
2337
2338static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2339{
2340 struct snd_pcm *pcm;
2341 int err = nonseekable_open(inode, file);
2342 if (err < 0)
2343 return err;
2344 pcm = snd_lookup_minor_data(iminor(inode),
2345 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2346 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2347 if (pcm)
2348 snd_card_unref(pcm->card);
2349 return err;
2350}
2351
2352static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2353{
2354 int err;
2355 wait_queue_t wait;
2356
2357 if (pcm == NULL) {
2358 err = -ENODEV;
2359 goto __error1;
2360 }
2361 err = snd_card_file_add(pcm->card, file);
2362 if (err < 0)
2363 goto __error1;
2364 if (!try_module_get(pcm->card->module)) {
2365 err = -EFAULT;
2366 goto __error2;
2367 }
2368 init_waitqueue_entry(&wait, current);
2369 add_wait_queue(&pcm->open_wait, &wait);
2370 mutex_lock(&pcm->open_mutex);
2371 while (1) {
2372 err = snd_pcm_open_file(file, pcm, stream);
2373 if (err >= 0)
2374 break;
2375 if (err == -EAGAIN) {
2376 if (file->f_flags & O_NONBLOCK) {
2377 err = -EBUSY;
2378 break;
2379 }
2380 } else
2381 break;
2382 set_current_state(TASK_INTERRUPTIBLE);
2383 mutex_unlock(&pcm->open_mutex);
2384 schedule();
2385 mutex_lock(&pcm->open_mutex);
2386 if (pcm->card->shutdown) {
2387 err = -ENODEV;
2388 break;
2389 }
2390 if (signal_pending(current)) {
2391 err = -ERESTARTSYS;
2392 break;
2393 }
2394 }
2395 remove_wait_queue(&pcm->open_wait, &wait);
2396 mutex_unlock(&pcm->open_mutex);
2397 if (err < 0)
2398 goto __error;
2399 return err;
2400
2401 __error:
2402 module_put(pcm->card->module);
2403 __error2:
2404 snd_card_file_remove(pcm->card, file);
2405 __error1:
2406 return err;
2407}
2408
2409static int snd_pcm_release(struct inode *inode, struct file *file)
2410{
2411 struct snd_pcm *pcm;
2412 struct snd_pcm_substream *substream;
2413 struct snd_pcm_file *pcm_file;
2414
2415 pcm_file = file->private_data;
2416 substream = pcm_file->substream;
2417 if (snd_BUG_ON(!substream))
2418 return -ENXIO;
2419 pcm = substream->pcm;
2420 mutex_lock(&pcm->open_mutex);
2421 snd_pcm_release_substream(substream);
2422 kfree(pcm_file);
2423 mutex_unlock(&pcm->open_mutex);
2424 wake_up(&pcm->open_wait);
2425 module_put(pcm->card->module);
2426 snd_card_file_remove(pcm->card, file);
2427 return 0;
2428}
2429
2430static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2431 snd_pcm_uframes_t frames)
2432{
2433 struct snd_pcm_runtime *runtime = substream->runtime;
2434 snd_pcm_sframes_t appl_ptr;
2435 snd_pcm_sframes_t ret;
2436 snd_pcm_sframes_t hw_avail;
2437
2438 if (frames == 0)
2439 return 0;
2440
2441 snd_pcm_stream_lock_irq(substream);
2442 switch (runtime->status->state) {
2443 case SNDRV_PCM_STATE_PREPARED:
2444 break;
2445 case SNDRV_PCM_STATE_DRAINING:
2446 case SNDRV_PCM_STATE_RUNNING:
2447 if (snd_pcm_update_hw_ptr(substream) >= 0)
2448 break;
2449 /* Fall through */
2450 case SNDRV_PCM_STATE_XRUN:
2451 ret = -EPIPE;
2452 goto __end;
2453 case SNDRV_PCM_STATE_SUSPENDED:
2454 ret = -ESTRPIPE;
2455 goto __end;
2456 default:
2457 ret = -EBADFD;
2458 goto __end;
2459 }
2460
2461 hw_avail = snd_pcm_playback_hw_avail(runtime);
2462 if (hw_avail <= 0) {
2463 ret = 0;
2464 goto __end;
2465 }
2466 if (frames > (snd_pcm_uframes_t)hw_avail)
2467 frames = hw_avail;
2468 appl_ptr = runtime->control->appl_ptr - frames;
2469 if (appl_ptr < 0)
2470 appl_ptr += runtime->boundary;
2471 runtime->control->appl_ptr = appl_ptr;
2472 ret = frames;
2473 __end:
2474 snd_pcm_stream_unlock_irq(substream);
2475 return ret;
2476}
2477
2478static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2479 snd_pcm_uframes_t frames)
2480{
2481 struct snd_pcm_runtime *runtime = substream->runtime;
2482 snd_pcm_sframes_t appl_ptr;
2483 snd_pcm_sframes_t ret;
2484 snd_pcm_sframes_t hw_avail;
2485
2486 if (frames == 0)
2487 return 0;
2488
2489 snd_pcm_stream_lock_irq(substream);
2490 switch (runtime->status->state) {
2491 case SNDRV_PCM_STATE_PREPARED:
2492 case SNDRV_PCM_STATE_DRAINING:
2493 break;
2494 case SNDRV_PCM_STATE_RUNNING:
2495 if (snd_pcm_update_hw_ptr(substream) >= 0)
2496 break;
2497 /* Fall through */
2498 case SNDRV_PCM_STATE_XRUN:
2499 ret = -EPIPE;
2500 goto __end;
2501 case SNDRV_PCM_STATE_SUSPENDED:
2502 ret = -ESTRPIPE;
2503 goto __end;
2504 default:
2505 ret = -EBADFD;
2506 goto __end;
2507 }
2508
2509 hw_avail = snd_pcm_capture_hw_avail(runtime);
2510 if (hw_avail <= 0) {
2511 ret = 0;
2512 goto __end;
2513 }
2514 if (frames > (snd_pcm_uframes_t)hw_avail)
2515 frames = hw_avail;
2516 appl_ptr = runtime->control->appl_ptr - frames;
2517 if (appl_ptr < 0)
2518 appl_ptr += runtime->boundary;
2519 runtime->control->appl_ptr = appl_ptr;
2520 ret = frames;
2521 __end:
2522 snd_pcm_stream_unlock_irq(substream);
2523 return ret;
2524}
2525
2526static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2527 snd_pcm_uframes_t frames)
2528{
2529 struct snd_pcm_runtime *runtime = substream->runtime;
2530 snd_pcm_sframes_t appl_ptr;
2531 snd_pcm_sframes_t ret;
2532 snd_pcm_sframes_t avail;
2533
2534 if (frames == 0)
2535 return 0;
2536
2537 snd_pcm_stream_lock_irq(substream);
2538 switch (runtime->status->state) {
2539 case SNDRV_PCM_STATE_PREPARED:
2540 case SNDRV_PCM_STATE_PAUSED:
2541 break;
2542 case SNDRV_PCM_STATE_DRAINING:
2543 case SNDRV_PCM_STATE_RUNNING:
2544 if (snd_pcm_update_hw_ptr(substream) >= 0)
2545 break;
2546 /* Fall through */
2547 case SNDRV_PCM_STATE_XRUN:
2548 ret = -EPIPE;
2549 goto __end;
2550 case SNDRV_PCM_STATE_SUSPENDED:
2551 ret = -ESTRPIPE;
2552 goto __end;
2553 default:
2554 ret = -EBADFD;
2555 goto __end;
2556 }
2557
2558 avail = snd_pcm_playback_avail(runtime);
2559 if (avail <= 0) {
2560 ret = 0;
2561 goto __end;
2562 }
2563 if (frames > (snd_pcm_uframes_t)avail)
2564 frames = avail;
2565 appl_ptr = runtime->control->appl_ptr + frames;
2566 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2567 appl_ptr -= runtime->boundary;
2568 runtime->control->appl_ptr = appl_ptr;
2569 ret = frames;
2570 __end:
2571 snd_pcm_stream_unlock_irq(substream);
2572 return ret;
2573}
2574
2575static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2576 snd_pcm_uframes_t frames)
2577{
2578 struct snd_pcm_runtime *runtime = substream->runtime;
2579 snd_pcm_sframes_t appl_ptr;
2580 snd_pcm_sframes_t ret;
2581 snd_pcm_sframes_t avail;
2582
2583 if (frames == 0)
2584 return 0;
2585
2586 snd_pcm_stream_lock_irq(substream);
2587 switch (runtime->status->state) {
2588 case SNDRV_PCM_STATE_PREPARED:
2589 case SNDRV_PCM_STATE_DRAINING:
2590 case SNDRV_PCM_STATE_PAUSED:
2591 break;
2592 case SNDRV_PCM_STATE_RUNNING:
2593 if (snd_pcm_update_hw_ptr(substream) >= 0)
2594 break;
2595 /* Fall through */
2596 case SNDRV_PCM_STATE_XRUN:
2597 ret = -EPIPE;
2598 goto __end;
2599 case SNDRV_PCM_STATE_SUSPENDED:
2600 ret = -ESTRPIPE;
2601 goto __end;
2602 default:
2603 ret = -EBADFD;
2604 goto __end;
2605 }
2606
2607 avail = snd_pcm_capture_avail(runtime);
2608 if (avail <= 0) {
2609 ret = 0;
2610 goto __end;
2611 }
2612 if (frames > (snd_pcm_uframes_t)avail)
2613 frames = avail;
2614 appl_ptr = runtime->control->appl_ptr + frames;
2615 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2616 appl_ptr -= runtime->boundary;
2617 runtime->control->appl_ptr = appl_ptr;
2618 ret = frames;
2619 __end:
2620 snd_pcm_stream_unlock_irq(substream);
2621 return ret;
2622}
2623
2624static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2625{
2626 struct snd_pcm_runtime *runtime = substream->runtime;
2627 int err;
2628
2629 snd_pcm_stream_lock_irq(substream);
2630 switch (runtime->status->state) {
2631 case SNDRV_PCM_STATE_DRAINING:
2632 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2633 goto __badfd;
2634 /* Fall through */
2635 case SNDRV_PCM_STATE_RUNNING:
2636 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2637 break;
2638 /* Fall through */
2639 case SNDRV_PCM_STATE_PREPARED:
2640 err = 0;
2641 break;
2642 case SNDRV_PCM_STATE_SUSPENDED:
2643 err = -ESTRPIPE;
2644 break;
2645 case SNDRV_PCM_STATE_XRUN:
2646 err = -EPIPE;
2647 break;
2648 default:
2649 __badfd:
2650 err = -EBADFD;
2651 break;
2652 }
2653 snd_pcm_stream_unlock_irq(substream);
2654 return err;
2655}
2656
2657static int snd_pcm_delay(struct snd_pcm_substream *substream,
2658 snd_pcm_sframes_t __user *res)
2659{
2660 struct snd_pcm_runtime *runtime = substream->runtime;
2661 int err;
2662 snd_pcm_sframes_t n = 0;
2663
2664 snd_pcm_stream_lock_irq(substream);
2665 switch (runtime->status->state) {
2666 case SNDRV_PCM_STATE_DRAINING:
2667 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2668 goto __badfd;
2669 /* Fall through */
2670 case SNDRV_PCM_STATE_RUNNING:
2671 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2672 break;
2673 /* Fall through */
2674 case SNDRV_PCM_STATE_PREPARED:
2675 case SNDRV_PCM_STATE_SUSPENDED:
2676 err = 0;
2677 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2678 n = snd_pcm_playback_hw_avail(runtime);
2679 else
2680 n = snd_pcm_capture_avail(runtime);
2681 n += runtime->delay;
2682 break;
2683 case SNDRV_PCM_STATE_XRUN:
2684 err = -EPIPE;
2685 break;
2686 default:
2687 __badfd:
2688 err = -EBADFD;
2689 break;
2690 }
2691 snd_pcm_stream_unlock_irq(substream);
2692 if (!err)
2693 if (put_user(n, res))
2694 err = -EFAULT;
2695 return err;
2696}
2697
2698static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2699 struct snd_pcm_sync_ptr __user *_sync_ptr)
2700{
2701 struct snd_pcm_runtime *runtime = substream->runtime;
2702 struct snd_pcm_sync_ptr sync_ptr;
2703 volatile struct snd_pcm_mmap_status *status;
2704 volatile struct snd_pcm_mmap_control *control;
2705 int err;
2706
2707 memset(&sync_ptr, 0, sizeof(sync_ptr));
2708 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2709 return -EFAULT;
2710 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2711 return -EFAULT;
2712 status = runtime->status;
2713 control = runtime->control;
2714 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2715 err = snd_pcm_hwsync(substream);
2716 if (err < 0)
2717 return err;
2718 }
2719 snd_pcm_stream_lock_irq(substream);
2720 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2721 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2722 else
2723 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2724 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2725 control->avail_min = sync_ptr.c.control.avail_min;
2726 else
2727 sync_ptr.c.control.avail_min = control->avail_min;
2728 sync_ptr.s.status.state = status->state;
2729 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2730 sync_ptr.s.status.tstamp = status->tstamp;
2731 sync_ptr.s.status.suspended_state = status->suspended_state;
2732 snd_pcm_stream_unlock_irq(substream);
2733 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2734 return -EFAULT;
2735 return 0;
2736}
2737
2738static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2739{
2740 struct snd_pcm_runtime *runtime = substream->runtime;
2741 int arg;
2742
2743 if (get_user(arg, _arg))
2744 return -EFAULT;
2745 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2746 return -EINVAL;
2747 runtime->tstamp_type = arg;
2748 return 0;
2749}
2750
2751static int snd_pcm_common_ioctl1(struct file *file,
2752 struct snd_pcm_substream *substream,
2753 unsigned int cmd, void __user *arg)
2754{
2755 switch (cmd) {
2756 case SNDRV_PCM_IOCTL_PVERSION:
2757 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2758 case SNDRV_PCM_IOCTL_INFO:
2759 return snd_pcm_info_user(substream, arg);
2760 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2761 return 0;
2762 case SNDRV_PCM_IOCTL_TTSTAMP:
2763 return snd_pcm_tstamp(substream, arg);
2764 case SNDRV_PCM_IOCTL_HW_REFINE:
2765 return snd_pcm_hw_refine_user(substream, arg);
2766 case SNDRV_PCM_IOCTL_HW_PARAMS:
2767 return snd_pcm_hw_params_user(substream, arg);
2768 case SNDRV_PCM_IOCTL_HW_FREE:
2769 return snd_pcm_hw_free(substream);
2770 case SNDRV_PCM_IOCTL_SW_PARAMS:
2771 return snd_pcm_sw_params_user(substream, arg);
2772 case SNDRV_PCM_IOCTL_STATUS:
2773 return snd_pcm_status_user(substream, arg, false);
2774 case SNDRV_PCM_IOCTL_STATUS_EXT:
2775 return snd_pcm_status_user(substream, arg, true);
2776 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2777 return snd_pcm_channel_info_user(substream, arg);
2778 case SNDRV_PCM_IOCTL_PREPARE:
2779 return snd_pcm_prepare(substream, file);
2780 case SNDRV_PCM_IOCTL_RESET:
2781 return snd_pcm_reset(substream);
2782 case SNDRV_PCM_IOCTL_START:
2783 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2784 case SNDRV_PCM_IOCTL_LINK:
2785 return snd_pcm_link(substream, (int)(unsigned long) arg);
2786 case SNDRV_PCM_IOCTL_UNLINK:
2787 return snd_pcm_unlink(substream);
2788 case SNDRV_PCM_IOCTL_RESUME:
2789 return snd_pcm_resume(substream);
2790 case SNDRV_PCM_IOCTL_XRUN:
2791 return snd_pcm_xrun(substream);
2792 case SNDRV_PCM_IOCTL_HWSYNC:
2793 return snd_pcm_hwsync(substream);
2794 case SNDRV_PCM_IOCTL_DELAY:
2795 return snd_pcm_delay(substream, arg);
2796 case SNDRV_PCM_IOCTL_SYNC_PTR:
2797 return snd_pcm_sync_ptr(substream, arg);
2798#ifdef CONFIG_SND_SUPPORT_OLD_API
2799 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2800 return snd_pcm_hw_refine_old_user(substream, arg);
2801 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2802 return snd_pcm_hw_params_old_user(substream, arg);
2803#endif
2804 case SNDRV_PCM_IOCTL_DRAIN:
2805 return snd_pcm_drain(substream, file);
2806 case SNDRV_PCM_IOCTL_DROP:
2807 return snd_pcm_drop(substream);
2808 case SNDRV_PCM_IOCTL_PAUSE:
2809 {
2810 int res;
2811 snd_pcm_stream_lock_irq(substream);
2812 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2813 snd_pcm_stream_unlock_irq(substream);
2814 return res;
2815 }
2816 }
2817 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2818 return -ENOTTY;
2819}
2820
2821static int snd_pcm_playback_ioctl1(struct file *file,
2822 struct snd_pcm_substream *substream,
2823 unsigned int cmd, void __user *arg)
2824{
2825 if (snd_BUG_ON(!substream))
2826 return -ENXIO;
2827 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2828 return -EINVAL;
2829 switch (cmd) {
2830 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2831 {
2832 struct snd_xferi xferi;
2833 struct snd_xferi __user *_xferi = arg;
2834 struct snd_pcm_runtime *runtime = substream->runtime;
2835 snd_pcm_sframes_t result;
2836 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2837 return -EBADFD;
2838 if (put_user(0, &_xferi->result))
2839 return -EFAULT;
2840 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2841 return -EFAULT;
2842 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2843 __put_user(result, &_xferi->result);
2844 return result < 0 ? result : 0;
2845 }
2846 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2847 {
2848 struct snd_xfern xfern;
2849 struct snd_xfern __user *_xfern = arg;
2850 struct snd_pcm_runtime *runtime = substream->runtime;
2851 void __user **bufs;
2852 snd_pcm_sframes_t result;
2853 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2854 return -EBADFD;
2855 if (runtime->channels > 128)
2856 return -EINVAL;
2857 if (put_user(0, &_xfern->result))
2858 return -EFAULT;
2859 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2860 return -EFAULT;
2861
2862 bufs = memdup_user(xfern.bufs,
2863 sizeof(void *) * runtime->channels);
2864 if (IS_ERR(bufs))
2865 return PTR_ERR(bufs);
2866 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2867 kfree(bufs);
2868 __put_user(result, &_xfern->result);
2869 return result < 0 ? result : 0;
2870 }
2871 case SNDRV_PCM_IOCTL_REWIND:
2872 {
2873 snd_pcm_uframes_t frames;
2874 snd_pcm_uframes_t __user *_frames = arg;
2875 snd_pcm_sframes_t result;
2876 if (get_user(frames, _frames))
2877 return -EFAULT;
2878 if (put_user(0, _frames))
2879 return -EFAULT;
2880 result = snd_pcm_playback_rewind(substream, frames);
2881 __put_user(result, _frames);
2882 return result < 0 ? result : 0;
2883 }
2884 case SNDRV_PCM_IOCTL_FORWARD:
2885 {
2886 snd_pcm_uframes_t frames;
2887 snd_pcm_uframes_t __user *_frames = arg;
2888 snd_pcm_sframes_t result;
2889 if (get_user(frames, _frames))
2890 return -EFAULT;
2891 if (put_user(0, _frames))
2892 return -EFAULT;
2893 result = snd_pcm_playback_forward(substream, frames);
2894 __put_user(result, _frames);
2895 return result < 0 ? result : 0;
2896 }
2897 }
2898 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2899}
2900
2901static int snd_pcm_capture_ioctl1(struct file *file,
2902 struct snd_pcm_substream *substream,
2903 unsigned int cmd, void __user *arg)
2904{
2905 if (snd_BUG_ON(!substream))
2906 return -ENXIO;
2907 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2908 return -EINVAL;
2909 switch (cmd) {
2910 case SNDRV_PCM_IOCTL_READI_FRAMES:
2911 {
2912 struct snd_xferi xferi;
2913 struct snd_xferi __user *_xferi = arg;
2914 struct snd_pcm_runtime *runtime = substream->runtime;
2915 snd_pcm_sframes_t result;
2916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2917 return -EBADFD;
2918 if (put_user(0, &_xferi->result))
2919 return -EFAULT;
2920 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2921 return -EFAULT;
2922 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2923 __put_user(result, &_xferi->result);
2924 return result < 0 ? result : 0;
2925 }
2926 case SNDRV_PCM_IOCTL_READN_FRAMES:
2927 {
2928 struct snd_xfern xfern;
2929 struct snd_xfern __user *_xfern = arg;
2930 struct snd_pcm_runtime *runtime = substream->runtime;
2931 void *bufs;
2932 snd_pcm_sframes_t result;
2933 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2934 return -EBADFD;
2935 if (runtime->channels > 128)
2936 return -EINVAL;
2937 if (put_user(0, &_xfern->result))
2938 return -EFAULT;
2939 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2940 return -EFAULT;
2941
2942 bufs = memdup_user(xfern.bufs,
2943 sizeof(void *) * runtime->channels);
2944 if (IS_ERR(bufs))
2945 return PTR_ERR(bufs);
2946 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2947 kfree(bufs);
2948 __put_user(result, &_xfern->result);
2949 return result < 0 ? result : 0;
2950 }
2951 case SNDRV_PCM_IOCTL_REWIND:
2952 {
2953 snd_pcm_uframes_t frames;
2954 snd_pcm_uframes_t __user *_frames = arg;
2955 snd_pcm_sframes_t result;
2956 if (get_user(frames, _frames))
2957 return -EFAULT;
2958 if (put_user(0, _frames))
2959 return -EFAULT;
2960 result = snd_pcm_capture_rewind(substream, frames);
2961 __put_user(result, _frames);
2962 return result < 0 ? result : 0;
2963 }
2964 case SNDRV_PCM_IOCTL_FORWARD:
2965 {
2966 snd_pcm_uframes_t frames;
2967 snd_pcm_uframes_t __user *_frames = arg;
2968 snd_pcm_sframes_t result;
2969 if (get_user(frames, _frames))
2970 return -EFAULT;
2971 if (put_user(0, _frames))
2972 return -EFAULT;
2973 result = snd_pcm_capture_forward(substream, frames);
2974 __put_user(result, _frames);
2975 return result < 0 ? result : 0;
2976 }
2977 }
2978 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2979}
2980
2981static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2982 unsigned long arg)
2983{
2984 struct snd_pcm_file *pcm_file;
2985
2986 pcm_file = file->private_data;
2987
2988 if (((cmd >> 8) & 0xff) != 'A')
2989 return -ENOTTY;
2990
2991 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2992 (void __user *)arg);
2993}
2994
2995static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2996 unsigned long arg)
2997{
2998 struct snd_pcm_file *pcm_file;
2999
3000 pcm_file = file->private_data;
3001
3002 if (((cmd >> 8) & 0xff) != 'A')
3003 return -ENOTTY;
3004
3005 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3006 (void __user *)arg);
3007}
3008
3009int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3010 unsigned int cmd, void *arg)
3011{
3012 mm_segment_t fs;
3013 int result;
3014
3015 fs = snd_enter_user();
3016 switch (substream->stream) {
3017 case SNDRV_PCM_STREAM_PLAYBACK:
3018 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3019 (void __user *)arg);
3020 break;
3021 case SNDRV_PCM_STREAM_CAPTURE:
3022 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3023 (void __user *)arg);
3024 break;
3025 default:
3026 result = -EINVAL;
3027 break;
3028 }
3029 snd_leave_user(fs);
3030 return result;
3031}
3032
3033EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3034
3035static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3036 loff_t * offset)
3037{
3038 struct snd_pcm_file *pcm_file;
3039 struct snd_pcm_substream *substream;
3040 struct snd_pcm_runtime *runtime;
3041 snd_pcm_sframes_t result;
3042
3043 pcm_file = file->private_data;
3044 substream = pcm_file->substream;
3045 if (PCM_RUNTIME_CHECK(substream))
3046 return -ENXIO;
3047 runtime = substream->runtime;
3048 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3049 return -EBADFD;
3050 if (!frame_aligned(runtime, count))
3051 return -EINVAL;
3052 count = bytes_to_frames(runtime, count);
3053 result = snd_pcm_lib_read(substream, buf, count);
3054 if (result > 0)
3055 result = frames_to_bytes(runtime, result);
3056 return result;
3057}
3058
3059static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3060 size_t count, loff_t * offset)
3061{
3062 struct snd_pcm_file *pcm_file;
3063 struct snd_pcm_substream *substream;
3064 struct snd_pcm_runtime *runtime;
3065 snd_pcm_sframes_t result;
3066
3067 pcm_file = file->private_data;
3068 substream = pcm_file->substream;
3069 if (PCM_RUNTIME_CHECK(substream))
3070 return -ENXIO;
3071 runtime = substream->runtime;
3072 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3073 return -EBADFD;
3074 if (!frame_aligned(runtime, count))
3075 return -EINVAL;
3076 count = bytes_to_frames(runtime, count);
3077 result = snd_pcm_lib_write(substream, buf, count);
3078 if (result > 0)
3079 result = frames_to_bytes(runtime, result);
3080 return result;
3081}
3082
3083static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3084{
3085 struct snd_pcm_file *pcm_file;
3086 struct snd_pcm_substream *substream;
3087 struct snd_pcm_runtime *runtime;
3088 snd_pcm_sframes_t result;
3089 unsigned long i;
3090 void __user **bufs;
3091 snd_pcm_uframes_t frames;
3092
3093 pcm_file = iocb->ki_filp->private_data;
3094 substream = pcm_file->substream;
3095 if (PCM_RUNTIME_CHECK(substream))
3096 return -ENXIO;
3097 runtime = substream->runtime;
3098 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3099 return -EBADFD;
3100 if (!iter_is_iovec(to))
3101 return -EINVAL;
3102 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3103 return -EINVAL;
3104 if (!frame_aligned(runtime, to->iov->iov_len))
3105 return -EINVAL;
3106 frames = bytes_to_samples(runtime, to->iov->iov_len);
3107 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3108 if (bufs == NULL)
3109 return -ENOMEM;
3110 for (i = 0; i < to->nr_segs; ++i)
3111 bufs[i] = to->iov[i].iov_base;
3112 result = snd_pcm_lib_readv(substream, bufs, frames);
3113 if (result > 0)
3114 result = frames_to_bytes(runtime, result);
3115 kfree(bufs);
3116 return result;
3117}
3118
3119static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3120{
3121 struct snd_pcm_file *pcm_file;
3122 struct snd_pcm_substream *substream;
3123 struct snd_pcm_runtime *runtime;
3124 snd_pcm_sframes_t result;
3125 unsigned long i;
3126 void __user **bufs;
3127 snd_pcm_uframes_t frames;
3128
3129 pcm_file = iocb->ki_filp->private_data;
3130 substream = pcm_file->substream;
3131 if (PCM_RUNTIME_CHECK(substream))
3132 return -ENXIO;
3133 runtime = substream->runtime;
3134 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3135 return -EBADFD;
3136 if (!iter_is_iovec(from))
3137 return -EINVAL;
3138 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3139 !frame_aligned(runtime, from->iov->iov_len))
3140 return -EINVAL;
3141 frames = bytes_to_samples(runtime, from->iov->iov_len);
3142 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3143 if (bufs == NULL)
3144 return -ENOMEM;
3145 for (i = 0; i < from->nr_segs; ++i)
3146 bufs[i] = from->iov[i].iov_base;
3147 result = snd_pcm_lib_writev(substream, bufs, frames);
3148 if (result > 0)
3149 result = frames_to_bytes(runtime, result);
3150 kfree(bufs);
3151 return result;
3152}
3153
3154static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3155{
3156 struct snd_pcm_file *pcm_file;
3157 struct snd_pcm_substream *substream;
3158 struct snd_pcm_runtime *runtime;
3159 unsigned int mask;
3160 snd_pcm_uframes_t avail;
3161
3162 pcm_file = file->private_data;
3163
3164 substream = pcm_file->substream;
3165 if (PCM_RUNTIME_CHECK(substream))
3166 return POLLOUT | POLLWRNORM | POLLERR;
3167 runtime = substream->runtime;
3168
3169 poll_wait(file, &runtime->sleep, wait);
3170
3171 snd_pcm_stream_lock_irq(substream);
3172 avail = snd_pcm_playback_avail(runtime);
3173 switch (runtime->status->state) {
3174 case SNDRV_PCM_STATE_RUNNING:
3175 case SNDRV_PCM_STATE_PREPARED:
3176 case SNDRV_PCM_STATE_PAUSED:
3177 if (avail >= runtime->control->avail_min) {
3178 mask = POLLOUT | POLLWRNORM;
3179 break;
3180 }
3181 /* Fall through */
3182 case SNDRV_PCM_STATE_DRAINING:
3183 mask = 0;
3184 break;
3185 default:
3186 mask = POLLOUT | POLLWRNORM | POLLERR;
3187 break;
3188 }
3189 snd_pcm_stream_unlock_irq(substream);
3190 return mask;
3191}
3192
3193static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3194{
3195 struct snd_pcm_file *pcm_file;
3196 struct snd_pcm_substream *substream;
3197 struct snd_pcm_runtime *runtime;
3198 unsigned int mask;
3199 snd_pcm_uframes_t avail;
3200
3201 pcm_file = file->private_data;
3202
3203 substream = pcm_file->substream;
3204 if (PCM_RUNTIME_CHECK(substream))
3205 return POLLIN | POLLRDNORM | POLLERR;
3206 runtime = substream->runtime;
3207
3208 poll_wait(file, &runtime->sleep, wait);
3209
3210 snd_pcm_stream_lock_irq(substream);
3211 avail = snd_pcm_capture_avail(runtime);
3212 switch (runtime->status->state) {
3213 case SNDRV_PCM_STATE_RUNNING:
3214 case SNDRV_PCM_STATE_PREPARED:
3215 case SNDRV_PCM_STATE_PAUSED:
3216 if (avail >= runtime->control->avail_min) {
3217 mask = POLLIN | POLLRDNORM;
3218 break;
3219 }
3220 mask = 0;
3221 break;
3222 case SNDRV_PCM_STATE_DRAINING:
3223 if (avail > 0) {
3224 mask = POLLIN | POLLRDNORM;
3225 break;
3226 }
3227 /* Fall through */
3228 default:
3229 mask = POLLIN | POLLRDNORM | POLLERR;
3230 break;
3231 }
3232 snd_pcm_stream_unlock_irq(substream);
3233 return mask;
3234}
3235
3236/*
3237 * mmap support
3238 */
3239
3240/*
3241 * Only on coherent architectures, we can mmap the status and the control records
3242 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3243 */
3244#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3245/*
3246 * mmap status record
3247 */
3248static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3249 struct vm_fault *vmf)
3250{
3251 struct snd_pcm_substream *substream = area->vm_private_data;
3252 struct snd_pcm_runtime *runtime;
3253
3254 if (substream == NULL)
3255 return VM_FAULT_SIGBUS;
3256 runtime = substream->runtime;
3257 vmf->page = virt_to_page(runtime->status);
3258 get_page(vmf->page);
3259 return 0;
3260}
3261
3262static const struct vm_operations_struct snd_pcm_vm_ops_status =
3263{
3264 .fault = snd_pcm_mmap_status_fault,
3265};
3266
3267static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3268 struct vm_area_struct *area)
3269{
3270 long size;
3271 if (!(area->vm_flags & VM_READ))
3272 return -EINVAL;
3273 size = area->vm_end - area->vm_start;
3274 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3275 return -EINVAL;
3276 area->vm_ops = &snd_pcm_vm_ops_status;
3277 area->vm_private_data = substream;
3278 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3279 return 0;
3280}
3281
3282/*
3283 * mmap control record
3284 */
3285static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3286 struct vm_fault *vmf)
3287{
3288 struct snd_pcm_substream *substream = area->vm_private_data;
3289 struct snd_pcm_runtime *runtime;
3290
3291 if (substream == NULL)
3292 return VM_FAULT_SIGBUS;
3293 runtime = substream->runtime;
3294 vmf->page = virt_to_page(runtime->control);
3295 get_page(vmf->page);
3296 return 0;
3297}
3298
3299static const struct vm_operations_struct snd_pcm_vm_ops_control =
3300{
3301 .fault = snd_pcm_mmap_control_fault,
3302};
3303
3304static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3305 struct vm_area_struct *area)
3306{
3307 long size;
3308 if (!(area->vm_flags & VM_READ))
3309 return -EINVAL;
3310 size = area->vm_end - area->vm_start;
3311 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3312 return -EINVAL;
3313 area->vm_ops = &snd_pcm_vm_ops_control;
3314 area->vm_private_data = substream;
3315 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3316 return 0;
3317}
3318#else /* ! coherent mmap */
3319/*
3320 * don't support mmap for status and control records.
3321 */
3322static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3323 struct vm_area_struct *area)
3324{
3325 return -ENXIO;
3326}
3327static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3328 struct vm_area_struct *area)
3329{
3330 return -ENXIO;
3331}
3332#endif /* coherent mmap */
3333
3334static inline struct page *
3335snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3336{
3337 void *vaddr = substream->runtime->dma_area + ofs;
3338 return virt_to_page(vaddr);
3339}
3340
3341/*
3342 * fault callback for mmapping a RAM page
3343 */
3344static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3345 struct vm_fault *vmf)
3346{
3347 struct snd_pcm_substream *substream = area->vm_private_data;
3348 struct snd_pcm_runtime *runtime;
3349 unsigned long offset;
3350 struct page * page;
3351 size_t dma_bytes;
3352
3353 if (substream == NULL)
3354 return VM_FAULT_SIGBUS;
3355 runtime = substream->runtime;
3356 offset = vmf->pgoff << PAGE_SHIFT;
3357 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3358 if (offset > dma_bytes - PAGE_SIZE)
3359 return VM_FAULT_SIGBUS;
3360 if (substream->ops->page)
3361 page = substream->ops->page(substream, offset);
3362 else
3363 page = snd_pcm_default_page_ops(substream, offset);
3364 if (!page)
3365 return VM_FAULT_SIGBUS;
3366 get_page(page);
3367 vmf->page = page;
3368 return 0;
3369}
3370
3371static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3372 .open = snd_pcm_mmap_data_open,
3373 .close = snd_pcm_mmap_data_close,
3374};
3375
3376static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3377 .open = snd_pcm_mmap_data_open,
3378 .close = snd_pcm_mmap_data_close,
3379 .fault = snd_pcm_mmap_data_fault,
3380};
3381
3382/*
3383 * mmap the DMA buffer on RAM
3384 */
3385
3386/**
3387 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3388 * @substream: PCM substream
3389 * @area: VMA
3390 *
3391 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3392 * this function is invoked implicitly.
3393 */
3394int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3395 struct vm_area_struct *area)
3396{
3397 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3398#ifdef CONFIG_GENERIC_ALLOCATOR
3399 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3400 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3401 return remap_pfn_range(area, area->vm_start,
3402 substream->dma_buffer.addr >> PAGE_SHIFT,
3403 area->vm_end - area->vm_start, area->vm_page_prot);
3404 }
3405#endif /* CONFIG_GENERIC_ALLOCATOR */
3406#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3407 if (!substream->ops->page &&
3408 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3409 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3410 area,
3411 substream->runtime->dma_area,
3412 substream->runtime->dma_addr,
3413 area->vm_end - area->vm_start);
3414#endif /* CONFIG_X86 */
3415 /* mmap with fault handler */
3416 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3417 return 0;
3418}
3419EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3420
3421/*
3422 * mmap the DMA buffer on I/O memory area
3423 */
3424#if SNDRV_PCM_INFO_MMAP_IOMEM
3425/**
3426 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3427 * @substream: PCM substream
3428 * @area: VMA
3429 *
3430 * When your hardware uses the iomapped pages as the hardware buffer and
3431 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3432 * is supposed to work only on limited architectures.
3433 */
3434int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3435 struct vm_area_struct *area)
3436{
3437 struct snd_pcm_runtime *runtime = substream->runtime;;
3438
3439 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3440 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3441}
3442
3443EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3444#endif /* SNDRV_PCM_INFO_MMAP */
3445
3446/*
3447 * mmap DMA buffer
3448 */
3449int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3450 struct vm_area_struct *area)
3451{
3452 struct snd_pcm_runtime *runtime;
3453 long size;
3454 unsigned long offset;
3455 size_t dma_bytes;
3456 int err;
3457
3458 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3459 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3460 return -EINVAL;
3461 } else {
3462 if (!(area->vm_flags & VM_READ))
3463 return -EINVAL;
3464 }
3465 runtime = substream->runtime;
3466 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3467 return -EBADFD;
3468 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3469 return -ENXIO;
3470 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3471 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3472 return -EINVAL;
3473 size = area->vm_end - area->vm_start;
3474 offset = area->vm_pgoff << PAGE_SHIFT;
3475 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3476 if ((size_t)size > dma_bytes)
3477 return -EINVAL;
3478 if (offset > dma_bytes - size)
3479 return -EINVAL;
3480
3481 area->vm_ops = &snd_pcm_vm_ops_data;
3482 area->vm_private_data = substream;
3483 if (substream->ops->mmap)
3484 err = substream->ops->mmap(substream, area);
3485 else
3486 err = snd_pcm_lib_default_mmap(substream, area);
3487 if (!err)
3488 atomic_inc(&substream->mmap_count);
3489 return err;
3490}
3491
3492EXPORT_SYMBOL(snd_pcm_mmap_data);
3493
3494static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3495{
3496 struct snd_pcm_file * pcm_file;
3497 struct snd_pcm_substream *substream;
3498 unsigned long offset;
3499
3500 pcm_file = file->private_data;
3501 substream = pcm_file->substream;
3502 if (PCM_RUNTIME_CHECK(substream))
3503 return -ENXIO;
3504
3505 offset = area->vm_pgoff << PAGE_SHIFT;
3506 switch (offset) {
3507 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3508 if (pcm_file->no_compat_mmap)
3509 return -ENXIO;
3510 return snd_pcm_mmap_status(substream, file, area);
3511 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3512 if (pcm_file->no_compat_mmap)
3513 return -ENXIO;
3514 return snd_pcm_mmap_control(substream, file, area);
3515 default:
3516 return snd_pcm_mmap_data(substream, file, area);
3517 }
3518 return 0;
3519}
3520
3521static int snd_pcm_fasync(int fd, struct file * file, int on)
3522{
3523 struct snd_pcm_file * pcm_file;
3524 struct snd_pcm_substream *substream;
3525 struct snd_pcm_runtime *runtime;
3526
3527 pcm_file = file->private_data;
3528 substream = pcm_file->substream;
3529 if (PCM_RUNTIME_CHECK(substream))
3530 return -ENXIO;
3531 runtime = substream->runtime;
3532 return fasync_helper(fd, file, on, &runtime->fasync);
3533}
3534
3535/*
3536 * ioctl32 compat
3537 */
3538#ifdef CONFIG_COMPAT
3539#include "pcm_compat.c"
3540#else
3541#define snd_pcm_ioctl_compat NULL
3542#endif
3543
3544/*
3545 * To be removed helpers to keep binary compatibility
3546 */
3547
3548#ifdef CONFIG_SND_SUPPORT_OLD_API
3549#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3550#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3551
3552static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3553 struct snd_pcm_hw_params_old *oparams)
3554{
3555 unsigned int i;
3556
3557 memset(params, 0, sizeof(*params));
3558 params->flags = oparams->flags;
3559 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3560 params->masks[i].bits[0] = oparams->masks[i];
3561 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3562 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3563 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3564 params->info = oparams->info;
3565 params->msbits = oparams->msbits;
3566 params->rate_num = oparams->rate_num;
3567 params->rate_den = oparams->rate_den;
3568 params->fifo_size = oparams->fifo_size;
3569}
3570
3571static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3572 struct snd_pcm_hw_params *params)
3573{
3574 unsigned int i;
3575
3576 memset(oparams, 0, sizeof(*oparams));
3577 oparams->flags = params->flags;
3578 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3579 oparams->masks[i] = params->masks[i].bits[0];
3580 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3581 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3582 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3583 oparams->info = params->info;
3584 oparams->msbits = params->msbits;
3585 oparams->rate_num = params->rate_num;
3586 oparams->rate_den = params->rate_den;
3587 oparams->fifo_size = params->fifo_size;
3588}
3589
3590static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3591 struct snd_pcm_hw_params_old __user * _oparams)
3592{
3593 struct snd_pcm_hw_params *params;
3594 struct snd_pcm_hw_params_old *oparams = NULL;
3595 int err;
3596
3597 params = kmalloc(sizeof(*params), GFP_KERNEL);
3598 if (!params)
3599 return -ENOMEM;
3600
3601 oparams = memdup_user(_oparams, sizeof(*oparams));
3602 if (IS_ERR(oparams)) {
3603 err = PTR_ERR(oparams);
3604 goto out;
3605 }
3606 snd_pcm_hw_convert_from_old_params(params, oparams);
3607 err = snd_pcm_hw_refine(substream, params);
3608 snd_pcm_hw_convert_to_old_params(oparams, params);
3609 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3610 if (!err)
3611 err = -EFAULT;
3612 }
3613
3614 kfree(oparams);
3615out:
3616 kfree(params);
3617 return err;
3618}
3619
3620static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3621 struct snd_pcm_hw_params_old __user * _oparams)
3622{
3623 struct snd_pcm_hw_params *params;
3624 struct snd_pcm_hw_params_old *oparams = NULL;
3625 int err;
3626
3627 params = kmalloc(sizeof(*params), GFP_KERNEL);
3628 if (!params)
3629 return -ENOMEM;
3630
3631 oparams = memdup_user(_oparams, sizeof(*oparams));
3632 if (IS_ERR(oparams)) {
3633 err = PTR_ERR(oparams);
3634 goto out;
3635 }
3636 snd_pcm_hw_convert_from_old_params(params, oparams);
3637 err = snd_pcm_hw_params(substream, params);
3638 snd_pcm_hw_convert_to_old_params(oparams, params);
3639 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3640 if (!err)
3641 err = -EFAULT;
3642 }
3643
3644 kfree(oparams);
3645out:
3646 kfree(params);
3647 return err;
3648}
3649#endif /* CONFIG_SND_SUPPORT_OLD_API */
3650
3651#ifndef CONFIG_MMU
3652static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3653 unsigned long addr,
3654 unsigned long len,
3655 unsigned long pgoff,
3656 unsigned long flags)
3657{
3658 struct snd_pcm_file *pcm_file = file->private_data;
3659 struct snd_pcm_substream *substream = pcm_file->substream;
3660 struct snd_pcm_runtime *runtime = substream->runtime;
3661 unsigned long offset = pgoff << PAGE_SHIFT;
3662
3663 switch (offset) {
3664 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3665 return (unsigned long)runtime->status;
3666 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3667 return (unsigned long)runtime->control;
3668 default:
3669 return (unsigned long)runtime->dma_area + offset;
3670 }
3671}
3672#else
3673# define snd_pcm_get_unmapped_area NULL
3674#endif
3675
3676/*
3677 * Register section
3678 */
3679
3680const struct file_operations snd_pcm_f_ops[2] = {
3681 {
3682 .owner = THIS_MODULE,
3683 .write = snd_pcm_write,
3684 .write_iter = snd_pcm_writev,
3685 .open = snd_pcm_playback_open,
3686 .release = snd_pcm_release,
3687 .llseek = no_llseek,
3688 .poll = snd_pcm_playback_poll,
3689 .unlocked_ioctl = snd_pcm_playback_ioctl,
3690 .compat_ioctl = snd_pcm_ioctl_compat,
3691 .mmap = snd_pcm_mmap,
3692 .fasync = snd_pcm_fasync,
3693 .get_unmapped_area = snd_pcm_get_unmapped_area,
3694 },
3695 {
3696 .owner = THIS_MODULE,
3697 .read = snd_pcm_read,
3698 .read_iter = snd_pcm_readv,
3699 .open = snd_pcm_capture_open,
3700 .release = snd_pcm_release,
3701 .llseek = no_llseek,
3702 .poll = snd_pcm_capture_poll,
3703 .unlocked_ioctl = snd_pcm_capture_ioctl,
3704 .compat_ioctl = snd_pcm_ioctl_compat,
3705 .mmap = snd_pcm_mmap,
3706 .fasync = snd_pcm_fasync,
3707 .get_unmapped_area = snd_pcm_get_unmapped_area,
3708 }
3709};
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/compat.h>
8#include <linux/mm.h>
9#include <linux/module.h>
10#include <linux/file.h>
11#include <linux/slab.h>
12#include <linux/sched/signal.h>
13#include <linux/time.h>
14#include <linux/pm_qos.h>
15#include <linux/io.h>
16#include <linux/dma-mapping.h>
17#include <linux/vmalloc.h>
18#include <sound/core.h>
19#include <sound/control.h>
20#include <sound/info.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/timer.h>
24#include <sound/minors.h>
25#include <linux/uio.h>
26#include <linux/delay.h>
27
28#include "pcm_local.h"
29
30#ifdef CONFIG_SND_DEBUG
31#define CREATE_TRACE_POINTS
32#include "pcm_param_trace.h"
33#else
34#define trace_hw_mask_param_enabled() 0
35#define trace_hw_interval_param_enabled() 0
36#define trace_hw_mask_param(substream, type, index, prev, curr)
37#define trace_hw_interval_param(substream, type, index, prev, curr)
38#endif
39
40/*
41 * Compatibility
42 */
43
44struct snd_pcm_hw_params_old {
45 unsigned int flags;
46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
47 SNDRV_PCM_HW_PARAM_ACCESS + 1];
48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
50 unsigned int rmask;
51 unsigned int cmask;
52 unsigned int info;
53 unsigned int msbits;
54 unsigned int rate_num;
55 unsigned int rate_den;
56 snd_pcm_uframes_t fifo_size;
57 unsigned char reserved[64];
58};
59
60#ifdef CONFIG_SND_SUPPORT_OLD_API
61#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
62#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
63
64static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68#endif
69static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
70
71/*
72 *
73 */
74
75static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77void snd_pcm_group_init(struct snd_pcm_group *group)
78{
79 spin_lock_init(&group->lock);
80 mutex_init(&group->mutex);
81 INIT_LIST_HEAD(&group->substreams);
82 refcount_set(&group->refs, 1);
83}
84
85/* define group lock helpers */
86#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
87static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
88{ \
89 if (nonatomic) \
90 mutex_ ## mutex_action(&group->mutex); \
91 else \
92 spin_ ## action(&group->lock); \
93}
94
95DEFINE_PCM_GROUP_LOCK(lock, lock);
96DEFINE_PCM_GROUP_LOCK(unlock, unlock);
97DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
98DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
99
100/**
101 * snd_pcm_stream_lock - Lock the PCM stream
102 * @substream: PCM substream
103 *
104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
105 * flag of the given substream. This also takes the global link rw lock
106 * (or rw sem), too, for avoiding the race with linked streams.
107 */
108void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
109{
110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
111}
112EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
113
114/**
115 * snd_pcm_stream_unlock - Unlock the PCM stream
116 * @substream: PCM substream
117 *
118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
119 */
120void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
121{
122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
123}
124EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
125
126/**
127 * snd_pcm_stream_lock_irq - Lock the PCM stream
128 * @substream: PCM substream
129 *
130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
132 * as snd_pcm_stream_lock().
133 */
134void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
135{
136 snd_pcm_group_lock_irq(&substream->self_group,
137 substream->pcm->nonatomic);
138}
139EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
140
141static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
142{
143 struct snd_pcm_group *group = &substream->self_group;
144
145 if (substream->pcm->nonatomic)
146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
147 else
148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
149}
150
151/**
152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
153 * @substream: PCM substream
154 *
155 * This is a counter-part of snd_pcm_stream_lock_irq().
156 */
157void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
158{
159 snd_pcm_group_unlock_irq(&substream->self_group,
160 substream->pcm->nonatomic);
161}
162EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
163
164unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
165{
166 unsigned long flags = 0;
167 if (substream->pcm->nonatomic)
168 mutex_lock(&substream->self_group.mutex);
169 else
170 spin_lock_irqsave(&substream->self_group.lock, flags);
171 return flags;
172}
173EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
174
175unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
176{
177 unsigned long flags = 0;
178 if (substream->pcm->nonatomic)
179 mutex_lock_nested(&substream->self_group.mutex,
180 SINGLE_DEPTH_NESTING);
181 else
182 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
183 SINGLE_DEPTH_NESTING);
184 return flags;
185}
186EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
187
188/**
189 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
190 * @substream: PCM substream
191 * @flags: irq flags
192 *
193 * This is a counter-part of snd_pcm_stream_lock_irqsave().
194 */
195void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
196 unsigned long flags)
197{
198 if (substream->pcm->nonatomic)
199 mutex_unlock(&substream->self_group.mutex);
200 else
201 spin_unlock_irqrestore(&substream->self_group.lock, flags);
202}
203EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
204
205/* Run PCM ioctl ops */
206static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
207 unsigned cmd, void *arg)
208{
209 if (substream->ops->ioctl)
210 return substream->ops->ioctl(substream, cmd, arg);
211 else
212 return snd_pcm_lib_ioctl(substream, cmd, arg);
213}
214
215int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
216{
217 struct snd_pcm *pcm = substream->pcm;
218 struct snd_pcm_str *pstr = substream->pstr;
219
220 memset(info, 0, sizeof(*info));
221 info->card = pcm->card->number;
222 info->device = pcm->device;
223 info->stream = substream->stream;
224 info->subdevice = substream->number;
225 strscpy(info->id, pcm->id, sizeof(info->id));
226 strscpy(info->name, pcm->name, sizeof(info->name));
227 info->dev_class = pcm->dev_class;
228 info->dev_subclass = pcm->dev_subclass;
229 info->subdevices_count = pstr->substream_count;
230 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
231 strscpy(info->subname, substream->name, sizeof(info->subname));
232
233 return 0;
234}
235
236int snd_pcm_info_user(struct snd_pcm_substream *substream,
237 struct snd_pcm_info __user * _info)
238{
239 struct snd_pcm_info *info __free(kfree) = NULL;
240 int err;
241
242 info = kmalloc(sizeof(*info), GFP_KERNEL);
243 if (! info)
244 return -ENOMEM;
245 err = snd_pcm_info(substream, info);
246 if (err >= 0) {
247 if (copy_to_user(_info, info, sizeof(*info)))
248 err = -EFAULT;
249 }
250 return err;
251}
252
253/* macro for simplified cast */
254#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
255
256static bool hw_support_mmap(struct snd_pcm_substream *substream)
257{
258 struct snd_dma_buffer *dmabuf;
259
260 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
261 return false;
262
263 if (substream->ops->mmap || substream->ops->page)
264 return true;
265
266 dmabuf = snd_pcm_get_dma_buf(substream);
267 if (!dmabuf)
268 dmabuf = &substream->dma_buffer;
269 switch (dmabuf->dev.type) {
270 case SNDRV_DMA_TYPE_UNKNOWN:
271 /* we can't know the device, so just assume that the driver does
272 * everything right
273 */
274 return true;
275 case SNDRV_DMA_TYPE_CONTINUOUS:
276 case SNDRV_DMA_TYPE_VMALLOC:
277 return true;
278 default:
279 return dma_can_mmap(dmabuf->dev.dev);
280 }
281}
282
283static int constrain_mask_params(struct snd_pcm_substream *substream,
284 struct snd_pcm_hw_params *params)
285{
286 struct snd_pcm_hw_constraints *constrs =
287 &substream->runtime->hw_constraints;
288 struct snd_mask *m;
289 unsigned int k;
290 struct snd_mask old_mask __maybe_unused;
291 int changed;
292
293 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
294 m = hw_param_mask(params, k);
295 if (snd_mask_empty(m))
296 return -EINVAL;
297
298 /* This parameter is not requested to change by a caller. */
299 if (!(params->rmask & PARAM_MASK_BIT(k)))
300 continue;
301
302 if (trace_hw_mask_param_enabled())
303 old_mask = *m;
304
305 changed = snd_mask_refine(m, constrs_mask(constrs, k));
306 if (changed < 0)
307 return changed;
308 if (changed == 0)
309 continue;
310
311 /* Set corresponding flag so that the caller gets it. */
312 trace_hw_mask_param(substream, k, 0, &old_mask, m);
313 params->cmask |= PARAM_MASK_BIT(k);
314 }
315
316 return 0;
317}
318
319static int constrain_interval_params(struct snd_pcm_substream *substream,
320 struct snd_pcm_hw_params *params)
321{
322 struct snd_pcm_hw_constraints *constrs =
323 &substream->runtime->hw_constraints;
324 struct snd_interval *i;
325 unsigned int k;
326 struct snd_interval old_interval __maybe_unused;
327 int changed;
328
329 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
330 i = hw_param_interval(params, k);
331 if (snd_interval_empty(i))
332 return -EINVAL;
333
334 /* This parameter is not requested to change by a caller. */
335 if (!(params->rmask & PARAM_MASK_BIT(k)))
336 continue;
337
338 if (trace_hw_interval_param_enabled())
339 old_interval = *i;
340
341 changed = snd_interval_refine(i, constrs_interval(constrs, k));
342 if (changed < 0)
343 return changed;
344 if (changed == 0)
345 continue;
346
347 /* Set corresponding flag so that the caller gets it. */
348 trace_hw_interval_param(substream, k, 0, &old_interval, i);
349 params->cmask |= PARAM_MASK_BIT(k);
350 }
351
352 return 0;
353}
354
355static int constrain_params_by_rules(struct snd_pcm_substream *substream,
356 struct snd_pcm_hw_params *params)
357{
358 struct snd_pcm_hw_constraints *constrs =
359 &substream->runtime->hw_constraints;
360 unsigned int k;
361 unsigned int *rstamps __free(kfree) = NULL;
362 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
363 unsigned int stamp;
364 struct snd_pcm_hw_rule *r;
365 unsigned int d;
366 struct snd_mask old_mask __maybe_unused;
367 struct snd_interval old_interval __maybe_unused;
368 bool again;
369 int changed, err = 0;
370
371 /*
372 * Each application of rule has own sequence number.
373 *
374 * Each member of 'rstamps' array represents the sequence number of
375 * recent application of corresponding rule.
376 */
377 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
378 if (!rstamps)
379 return -ENOMEM;
380
381 /*
382 * Each member of 'vstamps' array represents the sequence number of
383 * recent application of rule in which corresponding parameters were
384 * changed.
385 *
386 * In initial state, elements corresponding to parameters requested by
387 * a caller is 1. For unrequested parameters, corresponding members
388 * have 0 so that the parameters are never changed anymore.
389 */
390 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
391 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
392
393 /* Due to the above design, actual sequence number starts at 2. */
394 stamp = 2;
395retry:
396 /* Apply all rules in order. */
397 again = false;
398 for (k = 0; k < constrs->rules_num; k++) {
399 r = &constrs->rules[k];
400
401 /*
402 * Check condition bits of this rule. When the rule has
403 * some condition bits, parameter without the bits is
404 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
405 * is an example of the condition bits.
406 */
407 if (r->cond && !(r->cond & params->flags))
408 continue;
409
410 /*
411 * The 'deps' array includes maximum four dependencies
412 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
413 * member of this array is a sentinel and should be
414 * negative value.
415 *
416 * This rule should be processed in this time when dependent
417 * parameters were changed at former applications of the other
418 * rules.
419 */
420 for (d = 0; r->deps[d] >= 0; d++) {
421 if (vstamps[r->deps[d]] > rstamps[k])
422 break;
423 }
424 if (r->deps[d] < 0)
425 continue;
426
427 if (trace_hw_mask_param_enabled()) {
428 if (hw_is_mask(r->var))
429 old_mask = *hw_param_mask(params, r->var);
430 }
431 if (trace_hw_interval_param_enabled()) {
432 if (hw_is_interval(r->var))
433 old_interval = *hw_param_interval(params, r->var);
434 }
435
436 changed = r->func(params, r);
437 if (changed < 0)
438 return changed;
439
440 /*
441 * When the parameter is changed, notify it to the caller
442 * by corresponding returned bit, then preparing for next
443 * iteration.
444 */
445 if (changed && r->var >= 0) {
446 if (hw_is_mask(r->var)) {
447 trace_hw_mask_param(substream, r->var,
448 k + 1, &old_mask,
449 hw_param_mask(params, r->var));
450 }
451 if (hw_is_interval(r->var)) {
452 trace_hw_interval_param(substream, r->var,
453 k + 1, &old_interval,
454 hw_param_interval(params, r->var));
455 }
456
457 params->cmask |= PARAM_MASK_BIT(r->var);
458 vstamps[r->var] = stamp;
459 again = true;
460 }
461
462 rstamps[k] = stamp++;
463 }
464
465 /* Iterate to evaluate all rules till no parameters are changed. */
466 if (again)
467 goto retry;
468
469 return err;
470}
471
472static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
473 struct snd_pcm_hw_params *params)
474{
475 const struct snd_interval *i;
476 const struct snd_mask *m;
477 struct snd_mask *m_rw;
478 int err;
479
480 if (!params->msbits) {
481 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
482 if (snd_interval_single(i))
483 params->msbits = snd_interval_value(i);
484 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
485 if (snd_mask_single(m)) {
486 snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
487 params->msbits = snd_pcm_format_width(format);
488 }
489 }
490
491 if (params->msbits) {
492 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
493 if (snd_mask_single(m)) {
494 snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
495
496 if (snd_pcm_format_linear(format) &&
497 snd_pcm_format_width(format) != params->msbits) {
498 m_rw = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
499 snd_mask_reset(m_rw,
500 (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
501 if (snd_mask_empty(m_rw))
502 return -EINVAL;
503 }
504 }
505 }
506
507 if (!params->rate_den) {
508 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
509 if (snd_interval_single(i)) {
510 params->rate_num = snd_interval_value(i);
511 params->rate_den = 1;
512 }
513 }
514
515 if (!params->fifo_size) {
516 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
517 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
518 if (snd_mask_single(m) && snd_interval_single(i)) {
519 err = snd_pcm_ops_ioctl(substream,
520 SNDRV_PCM_IOCTL1_FIFO_SIZE,
521 params);
522 if (err < 0)
523 return err;
524 }
525 }
526
527 if (!params->info) {
528 params->info = substream->runtime->hw.info;
529 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
530 SNDRV_PCM_INFO_DRAIN_TRIGGER);
531 if (!hw_support_mmap(substream))
532 params->info &= ~(SNDRV_PCM_INFO_MMAP |
533 SNDRV_PCM_INFO_MMAP_VALID);
534 }
535
536 err = snd_pcm_ops_ioctl(substream,
537 SNDRV_PCM_IOCTL1_SYNC_ID,
538 params);
539 if (err < 0)
540 return err;
541
542 return 0;
543}
544
545int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
546 struct snd_pcm_hw_params *params)
547{
548 int err;
549
550 params->info = 0;
551 params->fifo_size = 0;
552 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
553 params->msbits = 0;
554 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
555 params->rate_num = 0;
556 params->rate_den = 0;
557 }
558
559 err = constrain_mask_params(substream, params);
560 if (err < 0)
561 return err;
562
563 err = constrain_interval_params(substream, params);
564 if (err < 0)
565 return err;
566
567 err = constrain_params_by_rules(substream, params);
568 if (err < 0)
569 return err;
570
571 params->rmask = 0;
572
573 return 0;
574}
575EXPORT_SYMBOL(snd_pcm_hw_refine);
576
577static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_hw_params __user * _params)
579{
580 struct snd_pcm_hw_params *params __free(kfree) = NULL;
581 int err;
582
583 params = memdup_user(_params, sizeof(*params));
584 if (IS_ERR(params))
585 return PTR_ERR(params);
586
587 err = snd_pcm_hw_refine(substream, params);
588 if (err < 0)
589 return err;
590
591 err = fixup_unreferenced_params(substream, params);
592 if (err < 0)
593 return err;
594
595 if (copy_to_user(_params, params, sizeof(*params)))
596 return -EFAULT;
597 return 0;
598}
599
600static int period_to_usecs(struct snd_pcm_runtime *runtime)
601{
602 int usecs;
603
604 if (! runtime->rate)
605 return -1; /* invalid */
606
607 /* take 75% of period time as the deadline */
608 usecs = (750000 / runtime->rate) * runtime->period_size;
609 usecs += ((750000 % runtime->rate) * runtime->period_size) /
610 runtime->rate;
611
612 return usecs;
613}
614
615static void snd_pcm_set_state(struct snd_pcm_substream *substream,
616 snd_pcm_state_t state)
617{
618 guard(pcm_stream_lock_irq)(substream);
619 if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
620 __snd_pcm_set_state(substream->runtime, state);
621}
622
623static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
624 int event)
625{
626#ifdef CONFIG_SND_PCM_TIMER
627 if (substream->timer)
628 snd_timer_notify(substream->timer, event,
629 &substream->runtime->trigger_tstamp);
630#endif
631}
632
633void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
634{
635 if (substream->runtime && substream->runtime->stop_operating) {
636 substream->runtime->stop_operating = false;
637 if (substream->ops && substream->ops->sync_stop)
638 substream->ops->sync_stop(substream);
639 else if (sync_irq && substream->pcm->card->sync_irq > 0)
640 synchronize_irq(substream->pcm->card->sync_irq);
641 }
642}
643
644/**
645 * snd_pcm_hw_params_choose - choose a configuration defined by @params
646 * @pcm: PCM instance
647 * @params: the hw_params instance
648 *
649 * Choose one configuration from configuration space defined by @params.
650 * The configuration chosen is that obtained fixing in this order:
651 * first access, first format, first subformat, min channels,
652 * min rate, min period time, max buffer size, min tick time
653 *
654 * Return: Zero if successful, or a negative error code on failure.
655 */
656static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
657 struct snd_pcm_hw_params *params)
658{
659 static const int vars[] = {
660 SNDRV_PCM_HW_PARAM_ACCESS,
661 SNDRV_PCM_HW_PARAM_FORMAT,
662 SNDRV_PCM_HW_PARAM_SUBFORMAT,
663 SNDRV_PCM_HW_PARAM_CHANNELS,
664 SNDRV_PCM_HW_PARAM_RATE,
665 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
666 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
667 SNDRV_PCM_HW_PARAM_TICK_TIME,
668 -1
669 };
670 const int *v;
671 struct snd_mask old_mask __maybe_unused;
672 struct snd_interval old_interval __maybe_unused;
673 int changed;
674
675 for (v = vars; *v != -1; v++) {
676 /* Keep old parameter to trace. */
677 if (trace_hw_mask_param_enabled()) {
678 if (hw_is_mask(*v))
679 old_mask = *hw_param_mask(params, *v);
680 }
681 if (trace_hw_interval_param_enabled()) {
682 if (hw_is_interval(*v))
683 old_interval = *hw_param_interval(params, *v);
684 }
685 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
686 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
687 else
688 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
689 if (changed < 0)
690 return changed;
691 if (changed == 0)
692 continue;
693
694 /* Trace the changed parameter. */
695 if (hw_is_mask(*v)) {
696 trace_hw_mask_param(pcm, *v, 0, &old_mask,
697 hw_param_mask(params, *v));
698 }
699 if (hw_is_interval(*v)) {
700 trace_hw_interval_param(pcm, *v, 0, &old_interval,
701 hw_param_interval(params, *v));
702 }
703 }
704
705 return 0;
706}
707
708/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
709 * block the further r/w operations
710 */
711static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
712{
713 if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
714 return -EBUSY;
715 mutex_lock(&runtime->buffer_mutex);
716 return 0; /* keep buffer_mutex, unlocked by below */
717}
718
719/* release buffer_mutex and clear r/w access flag */
720static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
721{
722 mutex_unlock(&runtime->buffer_mutex);
723 atomic_inc(&runtime->buffer_accessing);
724}
725
726#if IS_ENABLED(CONFIG_SND_PCM_OSS)
727#define is_oss_stream(substream) ((substream)->oss.oss)
728#else
729#define is_oss_stream(substream) false
730#endif
731
732static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
733 struct snd_pcm_hw_params *params)
734{
735 struct snd_pcm_runtime *runtime;
736 int err, usecs;
737 unsigned int bits;
738 snd_pcm_uframes_t frames;
739
740 if (PCM_RUNTIME_CHECK(substream))
741 return -ENXIO;
742 runtime = substream->runtime;
743 err = snd_pcm_buffer_access_lock(runtime);
744 if (err < 0)
745 return err;
746 scoped_guard(pcm_stream_lock_irq, substream) {
747 switch (runtime->state) {
748 case SNDRV_PCM_STATE_OPEN:
749 case SNDRV_PCM_STATE_SETUP:
750 case SNDRV_PCM_STATE_PREPARED:
751 if (!is_oss_stream(substream) &&
752 atomic_read(&substream->mmap_count))
753 err = -EBADFD;
754 break;
755 default:
756 err = -EBADFD;
757 break;
758 }
759 }
760 if (err)
761 goto unlock;
762
763 snd_pcm_sync_stop(substream, true);
764
765 params->rmask = ~0U;
766 err = snd_pcm_hw_refine(substream, params);
767 if (err < 0)
768 goto _error;
769
770 err = snd_pcm_hw_params_choose(substream, params);
771 if (err < 0)
772 goto _error;
773
774 err = fixup_unreferenced_params(substream, params);
775 if (err < 0)
776 goto _error;
777
778 if (substream->managed_buffer_alloc) {
779 err = snd_pcm_lib_malloc_pages(substream,
780 params_buffer_bytes(params));
781 if (err < 0)
782 goto _error;
783 runtime->buffer_changed = err > 0;
784 }
785
786 if (substream->ops->hw_params != NULL) {
787 err = substream->ops->hw_params(substream, params);
788 if (err < 0)
789 goto _error;
790 }
791
792 runtime->access = params_access(params);
793 runtime->format = params_format(params);
794 runtime->subformat = params_subformat(params);
795 runtime->channels = params_channels(params);
796 runtime->rate = params_rate(params);
797 runtime->period_size = params_period_size(params);
798 runtime->periods = params_periods(params);
799 runtime->buffer_size = params_buffer_size(params);
800 runtime->info = params->info;
801 runtime->rate_num = params->rate_num;
802 runtime->rate_den = params->rate_den;
803 runtime->no_period_wakeup =
804 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
805 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
806
807 bits = snd_pcm_format_physical_width(runtime->format);
808 runtime->sample_bits = bits;
809 bits *= runtime->channels;
810 runtime->frame_bits = bits;
811 frames = 1;
812 while (bits % 8 != 0) {
813 bits *= 2;
814 frames *= 2;
815 }
816 runtime->byte_align = bits / 8;
817 runtime->min_align = frames;
818
819 /* Default sw params */
820 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
821 runtime->period_step = 1;
822 runtime->control->avail_min = runtime->period_size;
823 runtime->start_threshold = 1;
824 runtime->stop_threshold = runtime->buffer_size;
825 runtime->silence_threshold = 0;
826 runtime->silence_size = 0;
827 runtime->boundary = runtime->buffer_size;
828 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
829 runtime->boundary *= 2;
830
831 /* clear the buffer for avoiding possible kernel info leaks */
832 if (runtime->dma_area && !substream->ops->copy) {
833 size_t size = runtime->dma_bytes;
834
835 if (runtime->info & SNDRV_PCM_INFO_MMAP)
836 size = PAGE_ALIGN(size);
837 memset(runtime->dma_area, 0, size);
838 }
839
840 snd_pcm_timer_resolution_change(substream);
841 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
842
843 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
844 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
845 usecs = period_to_usecs(runtime);
846 if (usecs >= 0)
847 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
848 usecs);
849 err = 0;
850 _error:
851 if (err) {
852 /* hardware might be unusable from this time,
853 * so we force application to retry to set
854 * the correct hardware parameter settings
855 */
856 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
857 if (substream->ops->hw_free != NULL)
858 substream->ops->hw_free(substream);
859 if (substream->managed_buffer_alloc)
860 snd_pcm_lib_free_pages(substream);
861 }
862 unlock:
863 snd_pcm_buffer_access_unlock(runtime);
864 return err;
865}
866
867static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
868 struct snd_pcm_hw_params __user * _params)
869{
870 struct snd_pcm_hw_params *params __free(kfree) = NULL;
871 int err;
872
873 params = memdup_user(_params, sizeof(*params));
874 if (IS_ERR(params))
875 return PTR_ERR(params);
876
877 err = snd_pcm_hw_params(substream, params);
878 if (err < 0)
879 return err;
880
881 if (copy_to_user(_params, params, sizeof(*params)))
882 return -EFAULT;
883 return err;
884}
885
886static int do_hw_free(struct snd_pcm_substream *substream)
887{
888 int result = 0;
889
890 snd_pcm_sync_stop(substream, true);
891 if (substream->ops->hw_free)
892 result = substream->ops->hw_free(substream);
893 if (substream->managed_buffer_alloc)
894 snd_pcm_lib_free_pages(substream);
895 return result;
896}
897
898static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
899{
900 struct snd_pcm_runtime *runtime;
901 int result = 0;
902
903 if (PCM_RUNTIME_CHECK(substream))
904 return -ENXIO;
905 runtime = substream->runtime;
906 result = snd_pcm_buffer_access_lock(runtime);
907 if (result < 0)
908 return result;
909 scoped_guard(pcm_stream_lock_irq, substream) {
910 switch (runtime->state) {
911 case SNDRV_PCM_STATE_SETUP:
912 case SNDRV_PCM_STATE_PREPARED:
913 if (atomic_read(&substream->mmap_count))
914 result = -EBADFD;
915 break;
916 default:
917 result = -EBADFD;
918 break;
919 }
920 }
921 if (result)
922 goto unlock;
923 result = do_hw_free(substream);
924 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
925 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
926 unlock:
927 snd_pcm_buffer_access_unlock(runtime);
928 return result;
929}
930
931static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
932 struct snd_pcm_sw_params *params)
933{
934 struct snd_pcm_runtime *runtime;
935 int err;
936
937 if (PCM_RUNTIME_CHECK(substream))
938 return -ENXIO;
939 runtime = substream->runtime;
940 scoped_guard(pcm_stream_lock_irq, substream) {
941 if (runtime->state == SNDRV_PCM_STATE_OPEN)
942 return -EBADFD;
943 }
944
945 if (params->tstamp_mode < 0 ||
946 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
947 return -EINVAL;
948 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
949 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
950 return -EINVAL;
951 if (params->avail_min == 0)
952 return -EINVAL;
953 if (params->silence_size >= runtime->boundary) {
954 if (params->silence_threshold != 0)
955 return -EINVAL;
956 } else {
957 if (params->silence_size > params->silence_threshold)
958 return -EINVAL;
959 if (params->silence_threshold > runtime->buffer_size)
960 return -EINVAL;
961 }
962 err = 0;
963 scoped_guard(pcm_stream_lock_irq, substream) {
964 runtime->tstamp_mode = params->tstamp_mode;
965 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
966 runtime->tstamp_type = params->tstamp_type;
967 runtime->period_step = params->period_step;
968 runtime->control->avail_min = params->avail_min;
969 runtime->start_threshold = params->start_threshold;
970 runtime->stop_threshold = params->stop_threshold;
971 runtime->silence_threshold = params->silence_threshold;
972 runtime->silence_size = params->silence_size;
973 params->boundary = runtime->boundary;
974 if (snd_pcm_running(substream)) {
975 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
976 runtime->silence_size > 0)
977 snd_pcm_playback_silence(substream, ULONG_MAX);
978 err = snd_pcm_update_state(substream, runtime);
979 }
980 }
981 return err;
982}
983
984static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
985 struct snd_pcm_sw_params __user * _params)
986{
987 struct snd_pcm_sw_params params;
988 int err;
989 if (copy_from_user(¶ms, _params, sizeof(params)))
990 return -EFAULT;
991 err = snd_pcm_sw_params(substream, ¶ms);
992 if (copy_to_user(_params, ¶ms, sizeof(params)))
993 return -EFAULT;
994 return err;
995}
996
997static inline snd_pcm_uframes_t
998snd_pcm_calc_delay(struct snd_pcm_substream *substream)
999{
1000 snd_pcm_uframes_t delay;
1001
1002 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1003 delay = snd_pcm_playback_hw_avail(substream->runtime);
1004 else
1005 delay = snd_pcm_capture_avail(substream->runtime);
1006 return delay + substream->runtime->delay;
1007}
1008
1009int snd_pcm_status64(struct snd_pcm_substream *substream,
1010 struct snd_pcm_status64 *status)
1011{
1012 struct snd_pcm_runtime *runtime = substream->runtime;
1013
1014 guard(pcm_stream_lock_irq)(substream);
1015
1016 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1017 &runtime->audio_tstamp_config);
1018
1019 /* backwards compatible behavior */
1020 if (runtime->audio_tstamp_config.type_requested ==
1021 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1022 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1023 runtime->audio_tstamp_config.type_requested =
1024 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1025 else
1026 runtime->audio_tstamp_config.type_requested =
1027 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1028 runtime->audio_tstamp_report.valid = 0;
1029 } else
1030 runtime->audio_tstamp_report.valid = 1;
1031
1032 status->state = runtime->state;
1033 status->suspended_state = runtime->suspended_state;
1034 if (status->state == SNDRV_PCM_STATE_OPEN)
1035 return 0;
1036 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1037 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1038 if (snd_pcm_running(substream)) {
1039 snd_pcm_update_hw_ptr(substream);
1040 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1041 status->tstamp_sec = runtime->status->tstamp.tv_sec;
1042 status->tstamp_nsec =
1043 runtime->status->tstamp.tv_nsec;
1044 status->driver_tstamp_sec =
1045 runtime->driver_tstamp.tv_sec;
1046 status->driver_tstamp_nsec =
1047 runtime->driver_tstamp.tv_nsec;
1048 status->audio_tstamp_sec =
1049 runtime->status->audio_tstamp.tv_sec;
1050 status->audio_tstamp_nsec =
1051 runtime->status->audio_tstamp.tv_nsec;
1052 if (runtime->audio_tstamp_report.valid == 1)
1053 /* backwards compatibility, no report provided in COMPAT mode */
1054 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1055 &status->audio_tstamp_accuracy,
1056 &runtime->audio_tstamp_report);
1057
1058 goto _tstamp_end;
1059 }
1060 } else {
1061 /* get tstamp only in fallback mode and only if enabled */
1062 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1063 struct timespec64 tstamp;
1064
1065 snd_pcm_gettime(runtime, &tstamp);
1066 status->tstamp_sec = tstamp.tv_sec;
1067 status->tstamp_nsec = tstamp.tv_nsec;
1068 }
1069 }
1070 _tstamp_end:
1071 status->appl_ptr = runtime->control->appl_ptr;
1072 status->hw_ptr = runtime->status->hw_ptr;
1073 status->avail = snd_pcm_avail(substream);
1074 status->delay = snd_pcm_running(substream) ?
1075 snd_pcm_calc_delay(substream) : 0;
1076 status->avail_max = runtime->avail_max;
1077 status->overrange = runtime->overrange;
1078 runtime->avail_max = 0;
1079 runtime->overrange = 0;
1080 return 0;
1081}
1082
1083static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1084 struct snd_pcm_status64 __user * _status,
1085 bool ext)
1086{
1087 struct snd_pcm_status64 status;
1088 int res;
1089
1090 memset(&status, 0, sizeof(status));
1091 /*
1092 * with extension, parameters are read/write,
1093 * get audio_tstamp_data from user,
1094 * ignore rest of status structure
1095 */
1096 if (ext && get_user(status.audio_tstamp_data,
1097 (u32 __user *)(&_status->audio_tstamp_data)))
1098 return -EFAULT;
1099 res = snd_pcm_status64(substream, &status);
1100 if (res < 0)
1101 return res;
1102 if (copy_to_user(_status, &status, sizeof(status)))
1103 return -EFAULT;
1104 return 0;
1105}
1106
1107static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1108 struct snd_pcm_status32 __user * _status,
1109 bool ext)
1110{
1111 struct snd_pcm_status64 status64;
1112 struct snd_pcm_status32 status32;
1113 int res;
1114
1115 memset(&status64, 0, sizeof(status64));
1116 memset(&status32, 0, sizeof(status32));
1117 /*
1118 * with extension, parameters are read/write,
1119 * get audio_tstamp_data from user,
1120 * ignore rest of status structure
1121 */
1122 if (ext && get_user(status64.audio_tstamp_data,
1123 (u32 __user *)(&_status->audio_tstamp_data)))
1124 return -EFAULT;
1125 res = snd_pcm_status64(substream, &status64);
1126 if (res < 0)
1127 return res;
1128
1129 status32 = (struct snd_pcm_status32) {
1130 .state = status64.state,
1131 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1132 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1133 .tstamp_sec = status64.tstamp_sec,
1134 .tstamp_nsec = status64.tstamp_nsec,
1135 .appl_ptr = status64.appl_ptr,
1136 .hw_ptr = status64.hw_ptr,
1137 .delay = status64.delay,
1138 .avail = status64.avail,
1139 .avail_max = status64.avail_max,
1140 .overrange = status64.overrange,
1141 .suspended_state = status64.suspended_state,
1142 .audio_tstamp_data = status64.audio_tstamp_data,
1143 .audio_tstamp_sec = status64.audio_tstamp_sec,
1144 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1145 .driver_tstamp_sec = status64.audio_tstamp_sec,
1146 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1147 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1148 };
1149
1150 if (copy_to_user(_status, &status32, sizeof(status32)))
1151 return -EFAULT;
1152
1153 return 0;
1154}
1155
1156static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1157 struct snd_pcm_channel_info * info)
1158{
1159 struct snd_pcm_runtime *runtime;
1160 unsigned int channel;
1161
1162 channel = info->channel;
1163 runtime = substream->runtime;
1164 scoped_guard(pcm_stream_lock_irq, substream) {
1165 if (runtime->state == SNDRV_PCM_STATE_OPEN)
1166 return -EBADFD;
1167 }
1168 if (channel >= runtime->channels)
1169 return -EINVAL;
1170 memset(info, 0, sizeof(*info));
1171 info->channel = channel;
1172 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1173}
1174
1175static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1176 struct snd_pcm_channel_info __user * _info)
1177{
1178 struct snd_pcm_channel_info info;
1179 int res;
1180
1181 if (copy_from_user(&info, _info, sizeof(info)))
1182 return -EFAULT;
1183 res = snd_pcm_channel_info(substream, &info);
1184 if (res < 0)
1185 return res;
1186 if (copy_to_user(_info, &info, sizeof(info)))
1187 return -EFAULT;
1188 return 0;
1189}
1190
1191static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1192{
1193 struct snd_pcm_runtime *runtime = substream->runtime;
1194 if (runtime->trigger_master == NULL)
1195 return;
1196 if (runtime->trigger_master == substream) {
1197 if (!runtime->trigger_tstamp_latched)
1198 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1199 } else {
1200 snd_pcm_trigger_tstamp(runtime->trigger_master);
1201 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1202 }
1203 runtime->trigger_master = NULL;
1204}
1205
1206#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
1207
1208struct action_ops {
1209 int (*pre_action)(struct snd_pcm_substream *substream,
1210 snd_pcm_state_t state);
1211 int (*do_action)(struct snd_pcm_substream *substream,
1212 snd_pcm_state_t state);
1213 void (*undo_action)(struct snd_pcm_substream *substream,
1214 snd_pcm_state_t state);
1215 void (*post_action)(struct snd_pcm_substream *substream,
1216 snd_pcm_state_t state);
1217};
1218
1219/*
1220 * this functions is core for handling of linked stream
1221 * Note: the stream state might be changed also on failure
1222 * Note2: call with calling stream lock + link lock
1223 */
1224static int snd_pcm_action_group(const struct action_ops *ops,
1225 struct snd_pcm_substream *substream,
1226 snd_pcm_state_t state,
1227 bool stream_lock)
1228{
1229 struct snd_pcm_substream *s = NULL;
1230 struct snd_pcm_substream *s1;
1231 int res = 0, depth = 1;
1232
1233 snd_pcm_group_for_each_entry(s, substream) {
1234 if (s != substream) {
1235 if (!stream_lock)
1236 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1237 else if (s->pcm->nonatomic)
1238 mutex_lock_nested(&s->self_group.mutex, depth);
1239 else
1240 spin_lock_nested(&s->self_group.lock, depth);
1241 depth++;
1242 }
1243 res = ops->pre_action(s, state);
1244 if (res < 0)
1245 goto _unlock;
1246 }
1247 snd_pcm_group_for_each_entry(s, substream) {
1248 res = ops->do_action(s, state);
1249 if (res < 0) {
1250 if (ops->undo_action) {
1251 snd_pcm_group_for_each_entry(s1, substream) {
1252 if (s1 == s) /* failed stream */
1253 break;
1254 ops->undo_action(s1, state);
1255 }
1256 }
1257 s = NULL; /* unlock all */
1258 goto _unlock;
1259 }
1260 }
1261 snd_pcm_group_for_each_entry(s, substream) {
1262 ops->post_action(s, state);
1263 }
1264 _unlock:
1265 /* unlock streams */
1266 snd_pcm_group_for_each_entry(s1, substream) {
1267 if (s1 != substream) {
1268 if (!stream_lock)
1269 mutex_unlock(&s1->runtime->buffer_mutex);
1270 else if (s1->pcm->nonatomic)
1271 mutex_unlock(&s1->self_group.mutex);
1272 else
1273 spin_unlock(&s1->self_group.lock);
1274 }
1275 if (s1 == s) /* end */
1276 break;
1277 }
1278 return res;
1279}
1280
1281/*
1282 * Note: call with stream lock
1283 */
1284static int snd_pcm_action_single(const struct action_ops *ops,
1285 struct snd_pcm_substream *substream,
1286 snd_pcm_state_t state)
1287{
1288 int res;
1289
1290 res = ops->pre_action(substream, state);
1291 if (res < 0)
1292 return res;
1293 res = ops->do_action(substream, state);
1294 if (res == 0)
1295 ops->post_action(substream, state);
1296 else if (ops->undo_action)
1297 ops->undo_action(substream, state);
1298 return res;
1299}
1300
1301static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1302 struct snd_pcm_group *new_group)
1303{
1304 substream->group = new_group;
1305 list_move(&substream->link_list, &new_group->substreams);
1306}
1307
1308/*
1309 * Unref and unlock the group, but keep the stream lock;
1310 * when the group becomes empty and no longer referred, destroy itself
1311 */
1312static void snd_pcm_group_unref(struct snd_pcm_group *group,
1313 struct snd_pcm_substream *substream)
1314{
1315 bool do_free;
1316
1317 if (!group)
1318 return;
1319 do_free = refcount_dec_and_test(&group->refs);
1320 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1321 if (do_free)
1322 kfree(group);
1323}
1324
1325/*
1326 * Lock the group inside a stream lock and reference it;
1327 * return the locked group object, or NULL if not linked
1328 */
1329static struct snd_pcm_group *
1330snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1331{
1332 bool nonatomic = substream->pcm->nonatomic;
1333 struct snd_pcm_group *group;
1334 bool trylock;
1335
1336 for (;;) {
1337 if (!snd_pcm_stream_linked(substream))
1338 return NULL;
1339 group = substream->group;
1340 /* block freeing the group object */
1341 refcount_inc(&group->refs);
1342
1343 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1344 spin_trylock(&group->lock);
1345 if (trylock)
1346 break; /* OK */
1347
1348 /* re-lock for avoiding ABBA deadlock */
1349 snd_pcm_stream_unlock(substream);
1350 snd_pcm_group_lock(group, nonatomic);
1351 snd_pcm_stream_lock(substream);
1352
1353 /* check the group again; the above opens a small race window */
1354 if (substream->group == group)
1355 break; /* OK */
1356 /* group changed, try again */
1357 snd_pcm_group_unref(group, substream);
1358 }
1359 return group;
1360}
1361
1362/*
1363 * Note: call with stream lock
1364 */
1365static int snd_pcm_action(const struct action_ops *ops,
1366 struct snd_pcm_substream *substream,
1367 snd_pcm_state_t state)
1368{
1369 struct snd_pcm_group *group;
1370 int res;
1371
1372 group = snd_pcm_stream_group_ref(substream);
1373 if (group)
1374 res = snd_pcm_action_group(ops, substream, state, true);
1375 else
1376 res = snd_pcm_action_single(ops, substream, state);
1377 snd_pcm_group_unref(group, substream);
1378 return res;
1379}
1380
1381/*
1382 * Note: don't use any locks before
1383 */
1384static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1385 struct snd_pcm_substream *substream,
1386 snd_pcm_state_t state)
1387{
1388 guard(pcm_stream_lock_irq)(substream);
1389 return snd_pcm_action(ops, substream, state);
1390}
1391
1392/*
1393 */
1394static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1395 struct snd_pcm_substream *substream,
1396 snd_pcm_state_t state)
1397{
1398 int res;
1399
1400 /* Guarantee the group members won't change during non-atomic action */
1401 guard(rwsem_read)(&snd_pcm_link_rwsem);
1402 res = snd_pcm_buffer_access_lock(substream->runtime);
1403 if (res < 0)
1404 return res;
1405 if (snd_pcm_stream_linked(substream))
1406 res = snd_pcm_action_group(ops, substream, state, false);
1407 else
1408 res = snd_pcm_action_single(ops, substream, state);
1409 snd_pcm_buffer_access_unlock(substream->runtime);
1410 return res;
1411}
1412
1413/*
1414 * start callbacks
1415 */
1416static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1417 snd_pcm_state_t state)
1418{
1419 struct snd_pcm_runtime *runtime = substream->runtime;
1420 if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1421 return -EBADFD;
1422 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1423 !snd_pcm_playback_data(substream))
1424 return -EPIPE;
1425 runtime->trigger_tstamp_latched = false;
1426 runtime->trigger_master = substream;
1427 return 0;
1428}
1429
1430static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1431 snd_pcm_state_t state)
1432{
1433 int err;
1434
1435 if (substream->runtime->trigger_master != substream)
1436 return 0;
1437 err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1438 /* XRUN happened during the start */
1439 if (err == -EPIPE)
1440 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN);
1441 return err;
1442}
1443
1444static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1445 snd_pcm_state_t state)
1446{
1447 if (substream->runtime->trigger_master == substream) {
1448 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1449 substream->runtime->stop_operating = true;
1450 }
1451}
1452
1453static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1454 snd_pcm_state_t state)
1455{
1456 struct snd_pcm_runtime *runtime = substream->runtime;
1457 snd_pcm_trigger_tstamp(substream);
1458 runtime->hw_ptr_jiffies = jiffies;
1459 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1460 runtime->rate;
1461 __snd_pcm_set_state(runtime, state);
1462 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1463 runtime->silence_size > 0)
1464 snd_pcm_playback_silence(substream, ULONG_MAX);
1465 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1466}
1467
1468static const struct action_ops snd_pcm_action_start = {
1469 .pre_action = snd_pcm_pre_start,
1470 .do_action = snd_pcm_do_start,
1471 .undo_action = snd_pcm_undo_start,
1472 .post_action = snd_pcm_post_start
1473};
1474
1475/**
1476 * snd_pcm_start - start all linked streams
1477 * @substream: the PCM substream instance
1478 *
1479 * Return: Zero if successful, or a negative error code.
1480 * The stream lock must be acquired before calling this function.
1481 */
1482int snd_pcm_start(struct snd_pcm_substream *substream)
1483{
1484 return snd_pcm_action(&snd_pcm_action_start, substream,
1485 SNDRV_PCM_STATE_RUNNING);
1486}
1487
1488/* take the stream lock and start the streams */
1489static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1490{
1491 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1492 SNDRV_PCM_STATE_RUNNING);
1493}
1494
1495/*
1496 * stop callbacks
1497 */
1498static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1499 snd_pcm_state_t state)
1500{
1501 struct snd_pcm_runtime *runtime = substream->runtime;
1502 if (runtime->state == SNDRV_PCM_STATE_OPEN)
1503 return -EBADFD;
1504 runtime->trigger_master = substream;
1505 return 0;
1506}
1507
1508static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1509 snd_pcm_state_t state)
1510{
1511 if (substream->runtime->trigger_master == substream &&
1512 snd_pcm_running(substream)) {
1513 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1514 substream->runtime->stop_operating = true;
1515 }
1516 return 0; /* unconditionally stop all substreams */
1517}
1518
1519static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1520 snd_pcm_state_t state)
1521{
1522 struct snd_pcm_runtime *runtime = substream->runtime;
1523 if (runtime->state != state) {
1524 snd_pcm_trigger_tstamp(substream);
1525 __snd_pcm_set_state(runtime, state);
1526 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1527 }
1528 wake_up(&runtime->sleep);
1529 wake_up(&runtime->tsleep);
1530}
1531
1532static const struct action_ops snd_pcm_action_stop = {
1533 .pre_action = snd_pcm_pre_stop,
1534 .do_action = snd_pcm_do_stop,
1535 .post_action = snd_pcm_post_stop
1536};
1537
1538/**
1539 * snd_pcm_stop - try to stop all running streams in the substream group
1540 * @substream: the PCM substream instance
1541 * @state: PCM state after stopping the stream
1542 *
1543 * The state of each stream is then changed to the given state unconditionally.
1544 *
1545 * Return: Zero if successful, or a negative error code.
1546 */
1547int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1548{
1549 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1550}
1551EXPORT_SYMBOL(snd_pcm_stop);
1552
1553/**
1554 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1555 * @substream: the PCM substream
1556 *
1557 * After stopping, the state is changed to SETUP.
1558 * Unlike snd_pcm_stop(), this affects only the given stream.
1559 *
1560 * Return: Zero if successful, or a negative error code.
1561 */
1562int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1563{
1564 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1565 SNDRV_PCM_STATE_SETUP);
1566}
1567
1568/**
1569 * snd_pcm_stop_xrun - stop the running streams as XRUN
1570 * @substream: the PCM substream instance
1571 *
1572 * This stops the given running substream (and all linked substreams) as XRUN.
1573 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1574 *
1575 * Return: Zero if successful, or a negative error code.
1576 */
1577int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1578{
1579 guard(pcm_stream_lock_irqsave)(substream);
1580 if (substream->runtime && snd_pcm_running(substream))
1581 __snd_pcm_xrun(substream);
1582 return 0;
1583}
1584EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1585
1586/*
1587 * pause callbacks: pass boolean (to start pause or resume) as state argument
1588 */
1589#define pause_pushed(state) (__force bool)(state)
1590
1591static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1592 snd_pcm_state_t state)
1593{
1594 struct snd_pcm_runtime *runtime = substream->runtime;
1595 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1596 return -ENOSYS;
1597 if (pause_pushed(state)) {
1598 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1599 return -EBADFD;
1600 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1601 return -EBADFD;
1602 runtime->trigger_master = substream;
1603 return 0;
1604}
1605
1606static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1607 snd_pcm_state_t state)
1608{
1609 if (substream->runtime->trigger_master != substream)
1610 return 0;
1611 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1612 * a delta between the current jiffies, this gives a large enough
1613 * delta, effectively to skip the check once.
1614 */
1615 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1616 return substream->ops->trigger(substream,
1617 pause_pushed(state) ?
1618 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1619 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1620}
1621
1622static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1623 snd_pcm_state_t state)
1624{
1625 if (substream->runtime->trigger_master == substream)
1626 substream->ops->trigger(substream,
1627 pause_pushed(state) ?
1628 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1629 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1630}
1631
1632static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1633 snd_pcm_state_t state)
1634{
1635 struct snd_pcm_runtime *runtime = substream->runtime;
1636 snd_pcm_trigger_tstamp(substream);
1637 if (pause_pushed(state)) {
1638 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1639 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1640 wake_up(&runtime->sleep);
1641 wake_up(&runtime->tsleep);
1642 } else {
1643 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1644 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1645 }
1646}
1647
1648static const struct action_ops snd_pcm_action_pause = {
1649 .pre_action = snd_pcm_pre_pause,
1650 .do_action = snd_pcm_do_pause,
1651 .undo_action = snd_pcm_undo_pause,
1652 .post_action = snd_pcm_post_pause
1653};
1654
1655/*
1656 * Push/release the pause for all linked streams.
1657 */
1658static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1659{
1660 return snd_pcm_action(&snd_pcm_action_pause, substream,
1661 (__force snd_pcm_state_t)push);
1662}
1663
1664static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1665 bool push)
1666{
1667 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1668 (__force snd_pcm_state_t)push);
1669}
1670
1671#ifdef CONFIG_PM
1672/* suspend callback: state argument ignored */
1673
1674static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1675 snd_pcm_state_t state)
1676{
1677 struct snd_pcm_runtime *runtime = substream->runtime;
1678 switch (runtime->state) {
1679 case SNDRV_PCM_STATE_SUSPENDED:
1680 return -EBUSY;
1681 /* unresumable PCM state; return -EBUSY for skipping suspend */
1682 case SNDRV_PCM_STATE_OPEN:
1683 case SNDRV_PCM_STATE_SETUP:
1684 case SNDRV_PCM_STATE_DISCONNECTED:
1685 return -EBUSY;
1686 }
1687 runtime->trigger_master = substream;
1688 return 0;
1689}
1690
1691static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1692 snd_pcm_state_t state)
1693{
1694 struct snd_pcm_runtime *runtime = substream->runtime;
1695 if (runtime->trigger_master != substream)
1696 return 0;
1697 if (! snd_pcm_running(substream))
1698 return 0;
1699 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1700 runtime->stop_operating = true;
1701 return 0; /* suspend unconditionally */
1702}
1703
1704static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1705 snd_pcm_state_t state)
1706{
1707 struct snd_pcm_runtime *runtime = substream->runtime;
1708 snd_pcm_trigger_tstamp(substream);
1709 runtime->suspended_state = runtime->state;
1710 runtime->status->suspended_state = runtime->suspended_state;
1711 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1712 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1713 wake_up(&runtime->sleep);
1714 wake_up(&runtime->tsleep);
1715}
1716
1717static const struct action_ops snd_pcm_action_suspend = {
1718 .pre_action = snd_pcm_pre_suspend,
1719 .do_action = snd_pcm_do_suspend,
1720 .post_action = snd_pcm_post_suspend
1721};
1722
1723/*
1724 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1725 * @substream: the PCM substream
1726 *
1727 * After this call, all streams are changed to SUSPENDED state.
1728 *
1729 * Return: Zero if successful, or a negative error code.
1730 */
1731static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1732{
1733 guard(pcm_stream_lock_irqsave)(substream);
1734 return snd_pcm_action(&snd_pcm_action_suspend, substream,
1735 ACTION_ARG_IGNORE);
1736}
1737
1738/**
1739 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1740 * @pcm: the PCM instance
1741 *
1742 * After this call, all streams are changed to SUSPENDED state.
1743 *
1744 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1745 */
1746int snd_pcm_suspend_all(struct snd_pcm *pcm)
1747{
1748 struct snd_pcm_substream *substream;
1749 int stream, err = 0;
1750
1751 if (! pcm)
1752 return 0;
1753
1754 for_each_pcm_substream(pcm, stream, substream) {
1755 /* FIXME: the open/close code should lock this as well */
1756 if (!substream->runtime)
1757 continue;
1758
1759 /*
1760 * Skip BE dai link PCM's that are internal and may
1761 * not have their substream ops set.
1762 */
1763 if (!substream->ops)
1764 continue;
1765
1766 err = snd_pcm_suspend(substream);
1767 if (err < 0 && err != -EBUSY)
1768 return err;
1769 }
1770
1771 for_each_pcm_substream(pcm, stream, substream)
1772 snd_pcm_sync_stop(substream, false);
1773
1774 return 0;
1775}
1776EXPORT_SYMBOL(snd_pcm_suspend_all);
1777
1778/* resume callbacks: state argument ignored */
1779
1780static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1781 snd_pcm_state_t state)
1782{
1783 struct snd_pcm_runtime *runtime = substream->runtime;
1784 if (runtime->state != SNDRV_PCM_STATE_SUSPENDED)
1785 return -EBADFD;
1786 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1787 return -ENOSYS;
1788 runtime->trigger_master = substream;
1789 return 0;
1790}
1791
1792static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1793 snd_pcm_state_t state)
1794{
1795 struct snd_pcm_runtime *runtime = substream->runtime;
1796 if (runtime->trigger_master != substream)
1797 return 0;
1798 /* DMA not running previously? */
1799 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1800 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1801 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1802 return 0;
1803 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1804}
1805
1806static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1807 snd_pcm_state_t state)
1808{
1809 if (substream->runtime->trigger_master == substream &&
1810 snd_pcm_running(substream))
1811 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1812}
1813
1814static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1815 snd_pcm_state_t state)
1816{
1817 struct snd_pcm_runtime *runtime = substream->runtime;
1818 snd_pcm_trigger_tstamp(substream);
1819 __snd_pcm_set_state(runtime, runtime->suspended_state);
1820 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1821}
1822
1823static const struct action_ops snd_pcm_action_resume = {
1824 .pre_action = snd_pcm_pre_resume,
1825 .do_action = snd_pcm_do_resume,
1826 .undo_action = snd_pcm_undo_resume,
1827 .post_action = snd_pcm_post_resume
1828};
1829
1830static int snd_pcm_resume(struct snd_pcm_substream *substream)
1831{
1832 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1833 ACTION_ARG_IGNORE);
1834}
1835
1836#else
1837
1838static int snd_pcm_resume(struct snd_pcm_substream *substream)
1839{
1840 return -ENOSYS;
1841}
1842
1843#endif /* CONFIG_PM */
1844
1845/*
1846 * xrun ioctl
1847 *
1848 * Change the RUNNING stream(s) to XRUN state.
1849 */
1850static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1851{
1852 struct snd_pcm_runtime *runtime = substream->runtime;
1853
1854 guard(pcm_stream_lock_irq)(substream);
1855 switch (runtime->state) {
1856 case SNDRV_PCM_STATE_XRUN:
1857 return 0; /* already there */
1858 case SNDRV_PCM_STATE_RUNNING:
1859 __snd_pcm_xrun(substream);
1860 return 0;
1861 default:
1862 return -EBADFD;
1863 }
1864}
1865
1866/*
1867 * reset ioctl
1868 */
1869/* reset callbacks: state argument ignored */
1870static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1871 snd_pcm_state_t state)
1872{
1873 struct snd_pcm_runtime *runtime = substream->runtime;
1874 switch (runtime->state) {
1875 case SNDRV_PCM_STATE_RUNNING:
1876 case SNDRV_PCM_STATE_PREPARED:
1877 case SNDRV_PCM_STATE_PAUSED:
1878 case SNDRV_PCM_STATE_SUSPENDED:
1879 return 0;
1880 default:
1881 return -EBADFD;
1882 }
1883}
1884
1885static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1886 snd_pcm_state_t state)
1887{
1888 struct snd_pcm_runtime *runtime = substream->runtime;
1889 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1890 if (err < 0)
1891 return err;
1892 guard(pcm_stream_lock_irq)(substream);
1893 runtime->hw_ptr_base = 0;
1894 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1895 runtime->status->hw_ptr % runtime->period_size;
1896 runtime->silence_start = runtime->status->hw_ptr;
1897 runtime->silence_filled = 0;
1898 return 0;
1899}
1900
1901static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1902 snd_pcm_state_t state)
1903{
1904 struct snd_pcm_runtime *runtime = substream->runtime;
1905 guard(pcm_stream_lock_irq)(substream);
1906 runtime->control->appl_ptr = runtime->status->hw_ptr;
1907 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1908 runtime->silence_size > 0)
1909 snd_pcm_playback_silence(substream, ULONG_MAX);
1910}
1911
1912static const struct action_ops snd_pcm_action_reset = {
1913 .pre_action = snd_pcm_pre_reset,
1914 .do_action = snd_pcm_do_reset,
1915 .post_action = snd_pcm_post_reset
1916};
1917
1918static int snd_pcm_reset(struct snd_pcm_substream *substream)
1919{
1920 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1921 ACTION_ARG_IGNORE);
1922}
1923
1924/*
1925 * prepare ioctl
1926 */
1927/* pass f_flags as state argument */
1928static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1929 snd_pcm_state_t state)
1930{
1931 struct snd_pcm_runtime *runtime = substream->runtime;
1932 int f_flags = (__force int)state;
1933
1934 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1935 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1936 return -EBADFD;
1937 if (snd_pcm_running(substream))
1938 return -EBUSY;
1939 substream->f_flags = f_flags;
1940 return 0;
1941}
1942
1943static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1944 snd_pcm_state_t state)
1945{
1946 int err;
1947 snd_pcm_sync_stop(substream, true);
1948 err = substream->ops->prepare(substream);
1949 if (err < 0)
1950 return err;
1951 return snd_pcm_do_reset(substream, state);
1952}
1953
1954static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1955 snd_pcm_state_t state)
1956{
1957 struct snd_pcm_runtime *runtime = substream->runtime;
1958 runtime->control->appl_ptr = runtime->status->hw_ptr;
1959 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1960}
1961
1962static const struct action_ops snd_pcm_action_prepare = {
1963 .pre_action = snd_pcm_pre_prepare,
1964 .do_action = snd_pcm_do_prepare,
1965 .post_action = snd_pcm_post_prepare
1966};
1967
1968/**
1969 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1970 * @substream: the PCM substream instance
1971 * @file: file to refer f_flags
1972 *
1973 * Return: Zero if successful, or a negative error code.
1974 */
1975static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1976 struct file *file)
1977{
1978 int f_flags;
1979
1980 if (file)
1981 f_flags = file->f_flags;
1982 else
1983 f_flags = substream->f_flags;
1984
1985 scoped_guard(pcm_stream_lock_irq, substream) {
1986 switch (substream->runtime->state) {
1987 case SNDRV_PCM_STATE_PAUSED:
1988 snd_pcm_pause(substream, false);
1989 fallthrough;
1990 case SNDRV_PCM_STATE_SUSPENDED:
1991 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1992 break;
1993 }
1994 }
1995
1996 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1997 substream,
1998 (__force snd_pcm_state_t)f_flags);
1999}
2000
2001/*
2002 * drain ioctl
2003 */
2004
2005/* drain init callbacks: state argument ignored */
2006static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2007 snd_pcm_state_t state)
2008{
2009 struct snd_pcm_runtime *runtime = substream->runtime;
2010 switch (runtime->state) {
2011 case SNDRV_PCM_STATE_OPEN:
2012 case SNDRV_PCM_STATE_DISCONNECTED:
2013 case SNDRV_PCM_STATE_SUSPENDED:
2014 return -EBADFD;
2015 }
2016 runtime->trigger_master = substream;
2017 return 0;
2018}
2019
2020static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2021 snd_pcm_state_t state)
2022{
2023 struct snd_pcm_runtime *runtime = substream->runtime;
2024 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2025 switch (runtime->state) {
2026 case SNDRV_PCM_STATE_PREPARED:
2027 /* start playback stream if possible */
2028 if (! snd_pcm_playback_empty(substream)) {
2029 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2030 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2031 } else {
2032 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2033 }
2034 break;
2035 case SNDRV_PCM_STATE_RUNNING:
2036 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2037 break;
2038 case SNDRV_PCM_STATE_XRUN:
2039 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2040 break;
2041 default:
2042 break;
2043 }
2044 } else {
2045 /* stop running stream */
2046 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2047 snd_pcm_state_t new_state;
2048
2049 new_state = snd_pcm_capture_avail(runtime) > 0 ?
2050 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2051 snd_pcm_do_stop(substream, new_state);
2052 snd_pcm_post_stop(substream, new_state);
2053 }
2054 }
2055
2056 if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2057 runtime->trigger_master == substream &&
2058 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2059 return substream->ops->trigger(substream,
2060 SNDRV_PCM_TRIGGER_DRAIN);
2061
2062 return 0;
2063}
2064
2065static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2066 snd_pcm_state_t state)
2067{
2068}
2069
2070static const struct action_ops snd_pcm_action_drain_init = {
2071 .pre_action = snd_pcm_pre_drain_init,
2072 .do_action = snd_pcm_do_drain_init,
2073 .post_action = snd_pcm_post_drain_init
2074};
2075
2076/*
2077 * Drain the stream(s).
2078 * When the substream is linked, sync until the draining of all playback streams
2079 * is finished.
2080 * After this call, all streams are supposed to be either SETUP or DRAINING
2081 * (capture only) state.
2082 */
2083static int snd_pcm_drain(struct snd_pcm_substream *substream,
2084 struct file *file)
2085{
2086 struct snd_card *card;
2087 struct snd_pcm_runtime *runtime;
2088 struct snd_pcm_substream *s;
2089 struct snd_pcm_group *group;
2090 wait_queue_entry_t wait;
2091 int result = 0;
2092 int nonblock = 0;
2093
2094 card = substream->pcm->card;
2095 runtime = substream->runtime;
2096
2097 if (runtime->state == SNDRV_PCM_STATE_OPEN)
2098 return -EBADFD;
2099
2100 if (file) {
2101 if (file->f_flags & O_NONBLOCK)
2102 nonblock = 1;
2103 } else if (substream->f_flags & O_NONBLOCK)
2104 nonblock = 1;
2105
2106 snd_pcm_stream_lock_irq(substream);
2107 /* resume pause */
2108 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2109 snd_pcm_pause(substream, false);
2110
2111 /* pre-start/stop - all running streams are changed to DRAINING state */
2112 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2113 ACTION_ARG_IGNORE);
2114 if (result < 0)
2115 goto unlock;
2116 /* in non-blocking, we don't wait in ioctl but let caller poll */
2117 if (nonblock) {
2118 result = -EAGAIN;
2119 goto unlock;
2120 }
2121
2122 for (;;) {
2123 long tout;
2124 struct snd_pcm_runtime *to_check;
2125 if (signal_pending(current)) {
2126 result = -ERESTARTSYS;
2127 break;
2128 }
2129 /* find a substream to drain */
2130 to_check = NULL;
2131 group = snd_pcm_stream_group_ref(substream);
2132 snd_pcm_group_for_each_entry(s, substream) {
2133 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2134 continue;
2135 runtime = s->runtime;
2136 if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2137 to_check = runtime;
2138 break;
2139 }
2140 }
2141 snd_pcm_group_unref(group, substream);
2142 if (!to_check)
2143 break; /* all drained */
2144 init_waitqueue_entry(&wait, current);
2145 set_current_state(TASK_INTERRUPTIBLE);
2146 add_wait_queue(&to_check->sleep, &wait);
2147 snd_pcm_stream_unlock_irq(substream);
2148 if (runtime->no_period_wakeup)
2149 tout = MAX_SCHEDULE_TIMEOUT;
2150 else {
2151 tout = 100;
2152 if (runtime->rate) {
2153 long t = runtime->buffer_size * 1100 / runtime->rate;
2154 tout = max(t, tout);
2155 }
2156 tout = msecs_to_jiffies(tout);
2157 }
2158 tout = schedule_timeout(tout);
2159
2160 snd_pcm_stream_lock_irq(substream);
2161 group = snd_pcm_stream_group_ref(substream);
2162 snd_pcm_group_for_each_entry(s, substream) {
2163 if (s->runtime == to_check) {
2164 remove_wait_queue(&to_check->sleep, &wait);
2165 break;
2166 }
2167 }
2168 snd_pcm_group_unref(group, substream);
2169
2170 if (card->shutdown) {
2171 result = -ENODEV;
2172 break;
2173 }
2174 if (tout == 0) {
2175 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2176 result = -ESTRPIPE;
2177 else {
2178 dev_dbg(substream->pcm->card->dev,
2179 "playback drain timeout (DMA or IRQ trouble?)\n");
2180 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2181 result = -EIO;
2182 }
2183 break;
2184 }
2185 }
2186
2187 unlock:
2188 snd_pcm_stream_unlock_irq(substream);
2189
2190 return result;
2191}
2192
2193/*
2194 * drop ioctl
2195 *
2196 * Immediately put all linked substreams into SETUP state.
2197 */
2198static int snd_pcm_drop(struct snd_pcm_substream *substream)
2199{
2200 struct snd_pcm_runtime *runtime;
2201 int result = 0;
2202
2203 if (PCM_RUNTIME_CHECK(substream))
2204 return -ENXIO;
2205 runtime = substream->runtime;
2206
2207 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2208 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2209 return -EBADFD;
2210
2211 guard(pcm_stream_lock_irq)(substream);
2212 /* resume pause */
2213 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2214 snd_pcm_pause(substream, false);
2215
2216 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2217 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2218
2219 return result;
2220}
2221
2222
2223static bool is_pcm_file(struct file *file)
2224{
2225 struct inode *inode = file_inode(file);
2226 struct snd_pcm *pcm;
2227 unsigned int minor;
2228
2229 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2230 return false;
2231 minor = iminor(inode);
2232 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2233 if (!pcm)
2234 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2235 if (!pcm)
2236 return false;
2237 snd_card_unref(pcm->card);
2238 return true;
2239}
2240
2241/*
2242 * PCM link handling
2243 */
2244static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2245{
2246 struct snd_pcm_file *pcm_file;
2247 struct snd_pcm_substream *substream1;
2248 struct snd_pcm_group *group __free(kfree) = NULL;
2249 struct snd_pcm_group *target_group;
2250 bool nonatomic = substream->pcm->nonatomic;
2251 CLASS(fd, f)(fd);
2252
2253 if (fd_empty(f))
2254 return -EBADFD;
2255 if (!is_pcm_file(fd_file(f)))
2256 return -EBADFD;
2257
2258 pcm_file = fd_file(f)->private_data;
2259 substream1 = pcm_file->substream;
2260
2261 if (substream == substream1)
2262 return -EINVAL;
2263
2264 group = kzalloc(sizeof(*group), GFP_KERNEL);
2265 if (!group)
2266 return -ENOMEM;
2267 snd_pcm_group_init(group);
2268
2269 guard(rwsem_write)(&snd_pcm_link_rwsem);
2270 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2271 substream->runtime->state != substream1->runtime->state ||
2272 substream->pcm->nonatomic != substream1->pcm->nonatomic)
2273 return -EBADFD;
2274 if (snd_pcm_stream_linked(substream1))
2275 return -EALREADY;
2276
2277 scoped_guard(pcm_stream_lock_irq, substream) {
2278 if (!snd_pcm_stream_linked(substream)) {
2279 snd_pcm_group_assign(substream, group);
2280 group = NULL; /* assigned, don't free this one below */
2281 }
2282 target_group = substream->group;
2283 }
2284
2285 snd_pcm_group_lock_irq(target_group, nonatomic);
2286 snd_pcm_stream_lock_nested(substream1);
2287 snd_pcm_group_assign(substream1, target_group);
2288 refcount_inc(&target_group->refs);
2289 snd_pcm_stream_unlock(substream1);
2290 snd_pcm_group_unlock_irq(target_group, nonatomic);
2291 return 0;
2292}
2293
2294static void relink_to_local(struct snd_pcm_substream *substream)
2295{
2296 snd_pcm_stream_lock_nested(substream);
2297 snd_pcm_group_assign(substream, &substream->self_group);
2298 snd_pcm_stream_unlock(substream);
2299}
2300
2301static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2302{
2303 struct snd_pcm_group *group;
2304 bool nonatomic = substream->pcm->nonatomic;
2305 bool do_free = false;
2306
2307 guard(rwsem_write)(&snd_pcm_link_rwsem);
2308
2309 if (!snd_pcm_stream_linked(substream))
2310 return -EALREADY;
2311
2312 group = substream->group;
2313 snd_pcm_group_lock_irq(group, nonatomic);
2314
2315 relink_to_local(substream);
2316 refcount_dec(&group->refs);
2317
2318 /* detach the last stream, too */
2319 if (list_is_singular(&group->substreams)) {
2320 relink_to_local(list_first_entry(&group->substreams,
2321 struct snd_pcm_substream,
2322 link_list));
2323 do_free = refcount_dec_and_test(&group->refs);
2324 }
2325
2326 snd_pcm_group_unlock_irq(group, nonatomic);
2327 if (do_free)
2328 kfree(group);
2329 return 0;
2330}
2331
2332/*
2333 * hw configurator
2334 */
2335static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2336 struct snd_pcm_hw_rule *rule)
2337{
2338 struct snd_interval t;
2339 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2340 hw_param_interval_c(params, rule->deps[1]), &t);
2341 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2342}
2343
2344static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2345 struct snd_pcm_hw_rule *rule)
2346{
2347 struct snd_interval t;
2348 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2349 hw_param_interval_c(params, rule->deps[1]), &t);
2350 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2351}
2352
2353static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2354 struct snd_pcm_hw_rule *rule)
2355{
2356 struct snd_interval t;
2357 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2358 hw_param_interval_c(params, rule->deps[1]),
2359 (unsigned long) rule->private, &t);
2360 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2361}
2362
2363static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2364 struct snd_pcm_hw_rule *rule)
2365{
2366 struct snd_interval t;
2367 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2368 (unsigned long) rule->private,
2369 hw_param_interval_c(params, rule->deps[1]), &t);
2370 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2371}
2372
2373static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2374 struct snd_pcm_hw_rule *rule)
2375{
2376 snd_pcm_format_t k;
2377 const struct snd_interval *i =
2378 hw_param_interval_c(params, rule->deps[0]);
2379 struct snd_mask m;
2380 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2381 snd_mask_any(&m);
2382 pcm_for_each_format(k) {
2383 int bits;
2384 if (!snd_mask_test_format(mask, k))
2385 continue;
2386 bits = snd_pcm_format_physical_width(k);
2387 if (bits <= 0)
2388 continue; /* ignore invalid formats */
2389 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2390 snd_mask_reset(&m, (__force unsigned)k);
2391 }
2392 return snd_mask_refine(mask, &m);
2393}
2394
2395static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2396 struct snd_pcm_hw_rule *rule)
2397{
2398 struct snd_interval t;
2399 snd_pcm_format_t k;
2400
2401 t.min = UINT_MAX;
2402 t.max = 0;
2403 t.openmin = 0;
2404 t.openmax = 0;
2405 pcm_for_each_format(k) {
2406 int bits;
2407 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2408 continue;
2409 bits = snd_pcm_format_physical_width(k);
2410 if (bits <= 0)
2411 continue; /* ignore invalid formats */
2412 if (t.min > (unsigned)bits)
2413 t.min = bits;
2414 if (t.max < (unsigned)bits)
2415 t.max = bits;
2416 }
2417 t.integer = 1;
2418 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2419}
2420
2421#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 ||\
2422 SNDRV_PCM_RATE_128000 != 1 << 19
2423#error "Change this table"
2424#endif
2425
2426/* NOTE: the list is unsorted! */
2427static const unsigned int rates[] = {
2428 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2429 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000,
2430 /* extended */
2431 12000, 24000, 128000
2432};
2433
2434const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2435 .count = ARRAY_SIZE(rates),
2436 .list = rates,
2437};
2438
2439static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2440 struct snd_pcm_hw_rule *rule)
2441{
2442 struct snd_pcm_hardware *hw = rule->private;
2443 return snd_interval_list(hw_param_interval(params, rule->var),
2444 snd_pcm_known_rates.count,
2445 snd_pcm_known_rates.list, hw->rates);
2446}
2447
2448static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2449 struct snd_pcm_hw_rule *rule)
2450{
2451 struct snd_interval t;
2452 struct snd_pcm_substream *substream = rule->private;
2453 t.min = 0;
2454 t.max = substream->buffer_bytes_max;
2455 t.openmin = 0;
2456 t.openmax = 0;
2457 t.integer = 1;
2458 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2459}
2460
2461static int snd_pcm_hw_rule_subformats(struct snd_pcm_hw_params *params,
2462 struct snd_pcm_hw_rule *rule)
2463{
2464 struct snd_mask *sfmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
2465 struct snd_mask *fmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2466 u32 *subformats = rule->private;
2467 snd_pcm_format_t f;
2468 struct snd_mask m;
2469
2470 snd_mask_none(&m);
2471 /* All PCMs support at least the default STD subformat. */
2472 snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_STD);
2473
2474 pcm_for_each_format(f) {
2475 if (!snd_mask_test(fmask, (__force unsigned)f))
2476 continue;
2477
2478 if (f == SNDRV_PCM_FORMAT_S32_LE && *subformats)
2479 m.bits[0] |= *subformats;
2480 else if (snd_pcm_format_linear(f))
2481 snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
2482 }
2483
2484 return snd_mask_refine(sfmask, &m);
2485}
2486
2487static int snd_pcm_hw_constraint_subformats(struct snd_pcm_runtime *runtime,
2488 unsigned int cond, u32 *subformats)
2489{
2490 return snd_pcm_hw_rule_add(runtime, cond, -1,
2491 snd_pcm_hw_rule_subformats, (void *)subformats,
2492 SNDRV_PCM_HW_PARAM_SUBFORMAT,
2493 SNDRV_PCM_HW_PARAM_FORMAT, -1);
2494}
2495
2496static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2497{
2498 struct snd_pcm_runtime *runtime = substream->runtime;
2499 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2500 int k, err;
2501
2502 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2503 snd_mask_any(constrs_mask(constrs, k));
2504 }
2505
2506 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2507 snd_interval_any(constrs_interval(constrs, k));
2508 }
2509
2510 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2511 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2512 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2513 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2514 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2515
2516 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2517 snd_pcm_hw_rule_format, NULL,
2518 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2519 if (err < 0)
2520 return err;
2521 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2522 snd_pcm_hw_rule_sample_bits, NULL,
2523 SNDRV_PCM_HW_PARAM_FORMAT,
2524 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2525 if (err < 0)
2526 return err;
2527 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2528 snd_pcm_hw_rule_div, NULL,
2529 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2530 if (err < 0)
2531 return err;
2532 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2533 snd_pcm_hw_rule_mul, NULL,
2534 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2535 if (err < 0)
2536 return err;
2537 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2538 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2539 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2540 if (err < 0)
2541 return err;
2542 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2543 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2544 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2545 if (err < 0)
2546 return err;
2547 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2548 snd_pcm_hw_rule_div, NULL,
2549 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2550 if (err < 0)
2551 return err;
2552 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2553 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2554 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2555 if (err < 0)
2556 return err;
2557 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2558 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2559 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2560 if (err < 0)
2561 return err;
2562 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2563 snd_pcm_hw_rule_div, NULL,
2564 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2565 if (err < 0)
2566 return err;
2567 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2568 snd_pcm_hw_rule_div, NULL,
2569 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2570 if (err < 0)
2571 return err;
2572 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2573 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2574 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2575 if (err < 0)
2576 return err;
2577 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2578 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2579 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2580 if (err < 0)
2581 return err;
2582 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2583 snd_pcm_hw_rule_mul, NULL,
2584 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2585 if (err < 0)
2586 return err;
2587 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2588 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2589 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2590 if (err < 0)
2591 return err;
2592 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2593 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2594 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2595 if (err < 0)
2596 return err;
2597 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2598 snd_pcm_hw_rule_muldivk, (void*) 8,
2599 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2600 if (err < 0)
2601 return err;
2602 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2603 snd_pcm_hw_rule_muldivk, (void*) 8,
2604 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2605 if (err < 0)
2606 return err;
2607 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2608 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2609 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2610 if (err < 0)
2611 return err;
2612 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2613 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2614 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2615 if (err < 0)
2616 return err;
2617 return 0;
2618}
2619
2620static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2621{
2622 struct snd_pcm_runtime *runtime = substream->runtime;
2623 struct snd_pcm_hardware *hw = &runtime->hw;
2624 int err;
2625 unsigned int mask = 0;
2626
2627 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2628 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2629 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2630 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2631 if (hw_support_mmap(substream)) {
2632 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2633 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2634 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2635 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2636 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2637 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2638 }
2639 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2640 if (err < 0)
2641 return err;
2642
2643 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2644 if (err < 0)
2645 return err;
2646
2647 err = snd_pcm_hw_constraint_subformats(runtime, 0, &hw->subformats);
2648 if (err < 0)
2649 return err;
2650
2651 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2652 hw->channels_min, hw->channels_max);
2653 if (err < 0)
2654 return err;
2655
2656 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2657 hw->rate_min, hw->rate_max);
2658 if (err < 0)
2659 return err;
2660
2661 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2662 hw->period_bytes_min, hw->period_bytes_max);
2663 if (err < 0)
2664 return err;
2665
2666 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2667 hw->periods_min, hw->periods_max);
2668 if (err < 0)
2669 return err;
2670
2671 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2672 hw->period_bytes_min, hw->buffer_bytes_max);
2673 if (err < 0)
2674 return err;
2675
2676 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2677 snd_pcm_hw_rule_buffer_bytes_max, substream,
2678 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2679 if (err < 0)
2680 return err;
2681
2682 /* FIXME: remove */
2683 if (runtime->dma_bytes) {
2684 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2685 if (err < 0)
2686 return err;
2687 }
2688
2689 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2690 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2691 snd_pcm_hw_rule_rate, hw,
2692 SNDRV_PCM_HW_PARAM_RATE, -1);
2693 if (err < 0)
2694 return err;
2695 }
2696
2697 /* FIXME: this belong to lowlevel */
2698 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2699
2700 return 0;
2701}
2702
2703static void pcm_release_private(struct snd_pcm_substream *substream)
2704{
2705 if (snd_pcm_stream_linked(substream))
2706 snd_pcm_unlink(substream);
2707}
2708
2709void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2710{
2711 substream->ref_count--;
2712 if (substream->ref_count > 0)
2713 return;
2714
2715 snd_pcm_drop(substream);
2716 if (substream->hw_opened) {
2717 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2718 do_hw_free(substream);
2719 substream->ops->close(substream);
2720 substream->hw_opened = 0;
2721 }
2722 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2723 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2724 if (substream->pcm_release) {
2725 substream->pcm_release(substream);
2726 substream->pcm_release = NULL;
2727 }
2728 snd_pcm_detach_substream(substream);
2729}
2730EXPORT_SYMBOL(snd_pcm_release_substream);
2731
2732int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2733 struct file *file,
2734 struct snd_pcm_substream **rsubstream)
2735{
2736 struct snd_pcm_substream *substream;
2737 int err;
2738
2739 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2740 if (err < 0)
2741 return err;
2742 if (substream->ref_count > 1) {
2743 *rsubstream = substream;
2744 return 0;
2745 }
2746
2747 err = snd_pcm_hw_constraints_init(substream);
2748 if (err < 0) {
2749 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2750 goto error;
2751 }
2752
2753 err = substream->ops->open(substream);
2754 if (err < 0)
2755 goto error;
2756
2757 substream->hw_opened = 1;
2758
2759 err = snd_pcm_hw_constraints_complete(substream);
2760 if (err < 0) {
2761 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2762 goto error;
2763 }
2764
2765 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2766 * the DMA buffer requires it
2767 */
2768 if (substream->managed_buffer_alloc &&
2769 substream->dma_buffer.dev.need_sync)
2770 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2771
2772 *rsubstream = substream;
2773 return 0;
2774
2775 error:
2776 snd_pcm_release_substream(substream);
2777 return err;
2778}
2779EXPORT_SYMBOL(snd_pcm_open_substream);
2780
2781static int snd_pcm_open_file(struct file *file,
2782 struct snd_pcm *pcm,
2783 int stream)
2784{
2785 struct snd_pcm_file *pcm_file;
2786 struct snd_pcm_substream *substream;
2787 int err;
2788
2789 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2790 if (err < 0)
2791 return err;
2792
2793 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2794 if (pcm_file == NULL) {
2795 snd_pcm_release_substream(substream);
2796 return -ENOMEM;
2797 }
2798 pcm_file->substream = substream;
2799 if (substream->ref_count == 1)
2800 substream->pcm_release = pcm_release_private;
2801 file->private_data = pcm_file;
2802
2803 return 0;
2804}
2805
2806static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2807{
2808 struct snd_pcm *pcm;
2809 int err = nonseekable_open(inode, file);
2810 if (err < 0)
2811 return err;
2812 pcm = snd_lookup_minor_data(iminor(inode),
2813 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2814 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2815 if (pcm)
2816 snd_card_unref(pcm->card);
2817 return err;
2818}
2819
2820static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2821{
2822 struct snd_pcm *pcm;
2823 int err = nonseekable_open(inode, file);
2824 if (err < 0)
2825 return err;
2826 pcm = snd_lookup_minor_data(iminor(inode),
2827 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2828 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2829 if (pcm)
2830 snd_card_unref(pcm->card);
2831 return err;
2832}
2833
2834static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2835{
2836 int err;
2837 wait_queue_entry_t wait;
2838
2839 if (pcm == NULL) {
2840 err = -ENODEV;
2841 goto __error1;
2842 }
2843 err = snd_card_file_add(pcm->card, file);
2844 if (err < 0)
2845 goto __error1;
2846 if (!try_module_get(pcm->card->module)) {
2847 err = -EFAULT;
2848 goto __error2;
2849 }
2850 init_waitqueue_entry(&wait, current);
2851 add_wait_queue(&pcm->open_wait, &wait);
2852 mutex_lock(&pcm->open_mutex);
2853 while (1) {
2854 err = snd_pcm_open_file(file, pcm, stream);
2855 if (err >= 0)
2856 break;
2857 if (err == -EAGAIN) {
2858 if (file->f_flags & O_NONBLOCK) {
2859 err = -EBUSY;
2860 break;
2861 }
2862 } else
2863 break;
2864 set_current_state(TASK_INTERRUPTIBLE);
2865 mutex_unlock(&pcm->open_mutex);
2866 schedule();
2867 mutex_lock(&pcm->open_mutex);
2868 if (pcm->card->shutdown) {
2869 err = -ENODEV;
2870 break;
2871 }
2872 if (signal_pending(current)) {
2873 err = -ERESTARTSYS;
2874 break;
2875 }
2876 }
2877 remove_wait_queue(&pcm->open_wait, &wait);
2878 mutex_unlock(&pcm->open_mutex);
2879 if (err < 0)
2880 goto __error;
2881 return err;
2882
2883 __error:
2884 module_put(pcm->card->module);
2885 __error2:
2886 snd_card_file_remove(pcm->card, file);
2887 __error1:
2888 return err;
2889}
2890
2891static int snd_pcm_release(struct inode *inode, struct file *file)
2892{
2893 struct snd_pcm *pcm;
2894 struct snd_pcm_substream *substream;
2895 struct snd_pcm_file *pcm_file;
2896
2897 pcm_file = file->private_data;
2898 substream = pcm_file->substream;
2899 if (snd_BUG_ON(!substream))
2900 return -ENXIO;
2901 pcm = substream->pcm;
2902
2903 /* block until the device gets woken up as it may touch the hardware */
2904 snd_power_wait(pcm->card);
2905
2906 scoped_guard(mutex, &pcm->open_mutex) {
2907 snd_pcm_release_substream(substream);
2908 kfree(pcm_file);
2909 }
2910 wake_up(&pcm->open_wait);
2911 module_put(pcm->card->module);
2912 snd_card_file_remove(pcm->card, file);
2913 return 0;
2914}
2915
2916/* check and update PCM state; return 0 or a negative error
2917 * call this inside PCM lock
2918 */
2919static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2920{
2921 switch (substream->runtime->state) {
2922 case SNDRV_PCM_STATE_DRAINING:
2923 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2924 return -EBADFD;
2925 fallthrough;
2926 case SNDRV_PCM_STATE_RUNNING:
2927 return snd_pcm_update_hw_ptr(substream);
2928 case SNDRV_PCM_STATE_PREPARED:
2929 case SNDRV_PCM_STATE_PAUSED:
2930 return 0;
2931 case SNDRV_PCM_STATE_SUSPENDED:
2932 return -ESTRPIPE;
2933 case SNDRV_PCM_STATE_XRUN:
2934 return -EPIPE;
2935 default:
2936 return -EBADFD;
2937 }
2938}
2939
2940/* increase the appl_ptr; returns the processed frames or a negative error */
2941static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2942 snd_pcm_uframes_t frames,
2943 snd_pcm_sframes_t avail)
2944{
2945 struct snd_pcm_runtime *runtime = substream->runtime;
2946 snd_pcm_sframes_t appl_ptr;
2947 int ret;
2948
2949 if (avail <= 0)
2950 return 0;
2951 if (frames > (snd_pcm_uframes_t)avail)
2952 frames = avail;
2953 appl_ptr = runtime->control->appl_ptr + frames;
2954 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2955 appl_ptr -= runtime->boundary;
2956 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2957 return ret < 0 ? ret : frames;
2958}
2959
2960/* decrease the appl_ptr; returns the processed frames or zero for error */
2961static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2962 snd_pcm_uframes_t frames,
2963 snd_pcm_sframes_t avail)
2964{
2965 struct snd_pcm_runtime *runtime = substream->runtime;
2966 snd_pcm_sframes_t appl_ptr;
2967 int ret;
2968
2969 if (avail <= 0)
2970 return 0;
2971 if (frames > (snd_pcm_uframes_t)avail)
2972 frames = avail;
2973 appl_ptr = runtime->control->appl_ptr - frames;
2974 if (appl_ptr < 0)
2975 appl_ptr += runtime->boundary;
2976 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2977 /* NOTE: we return zero for errors because PulseAudio gets depressed
2978 * upon receiving an error from rewind ioctl and stops processing
2979 * any longer. Returning zero means that no rewind is done, so
2980 * it's not absolutely wrong to answer like that.
2981 */
2982 return ret < 0 ? 0 : frames;
2983}
2984
2985static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2986 snd_pcm_uframes_t frames)
2987{
2988 snd_pcm_sframes_t ret;
2989
2990 if (frames == 0)
2991 return 0;
2992
2993 scoped_guard(pcm_stream_lock_irq, substream) {
2994 ret = do_pcm_hwsync(substream);
2995 if (!ret)
2996 ret = rewind_appl_ptr(substream, frames,
2997 snd_pcm_hw_avail(substream));
2998 }
2999 if (ret >= 0)
3000 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3001 return ret;
3002}
3003
3004static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
3005 snd_pcm_uframes_t frames)
3006{
3007 snd_pcm_sframes_t ret;
3008
3009 if (frames == 0)
3010 return 0;
3011
3012 scoped_guard(pcm_stream_lock_irq, substream) {
3013 ret = do_pcm_hwsync(substream);
3014 if (!ret)
3015 ret = forward_appl_ptr(substream, frames,
3016 snd_pcm_avail(substream));
3017 }
3018 if (ret >= 0)
3019 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3020 return ret;
3021}
3022
3023static int snd_pcm_delay(struct snd_pcm_substream *substream,
3024 snd_pcm_sframes_t *delay)
3025{
3026 int err;
3027
3028 scoped_guard(pcm_stream_lock_irq, substream) {
3029 err = do_pcm_hwsync(substream);
3030 if (delay && !err)
3031 *delay = snd_pcm_calc_delay(substream);
3032 }
3033 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3034
3035 return err;
3036}
3037
3038static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3039{
3040 return snd_pcm_delay(substream, NULL);
3041}
3042
3043static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3044 struct snd_pcm_sync_ptr __user *_sync_ptr)
3045{
3046 struct snd_pcm_runtime *runtime = substream->runtime;
3047 struct snd_pcm_sync_ptr sync_ptr;
3048 volatile struct snd_pcm_mmap_status *status;
3049 volatile struct snd_pcm_mmap_control *control;
3050 int err;
3051
3052 memset(&sync_ptr, 0, sizeof(sync_ptr));
3053 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3054 return -EFAULT;
3055 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3056 return -EFAULT;
3057 status = runtime->status;
3058 control = runtime->control;
3059 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3060 err = snd_pcm_hwsync(substream);
3061 if (err < 0)
3062 return err;
3063 }
3064 scoped_guard(pcm_stream_lock_irq, substream) {
3065 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3066 err = pcm_lib_apply_appl_ptr(substream,
3067 sync_ptr.c.control.appl_ptr);
3068 if (err < 0)
3069 return err;
3070 } else {
3071 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3072 }
3073 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3074 control->avail_min = sync_ptr.c.control.avail_min;
3075 else
3076 sync_ptr.c.control.avail_min = control->avail_min;
3077 sync_ptr.s.status.state = status->state;
3078 sync_ptr.s.status.hw_ptr = status->hw_ptr;
3079 sync_ptr.s.status.tstamp = status->tstamp;
3080 sync_ptr.s.status.suspended_state = status->suspended_state;
3081 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3082 }
3083 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3084 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3085 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3086 return -EFAULT;
3087 return 0;
3088}
3089
3090struct snd_pcm_mmap_status32 {
3091 snd_pcm_state_t state;
3092 s32 pad1;
3093 u32 hw_ptr;
3094 s32 tstamp_sec;
3095 s32 tstamp_nsec;
3096 snd_pcm_state_t suspended_state;
3097 s32 audio_tstamp_sec;
3098 s32 audio_tstamp_nsec;
3099} __packed;
3100
3101struct snd_pcm_mmap_control32 {
3102 u32 appl_ptr;
3103 u32 avail_min;
3104};
3105
3106struct snd_pcm_sync_ptr32 {
3107 u32 flags;
3108 union {
3109 struct snd_pcm_mmap_status32 status;
3110 unsigned char reserved[64];
3111 } s;
3112 union {
3113 struct snd_pcm_mmap_control32 control;
3114 unsigned char reserved[64];
3115 } c;
3116} __packed;
3117
3118/* recalculate the boundary within 32bit */
3119static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3120{
3121 snd_pcm_uframes_t boundary;
3122
3123 if (! runtime->buffer_size)
3124 return 0;
3125 boundary = runtime->buffer_size;
3126 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3127 boundary *= 2;
3128 return boundary;
3129}
3130
3131static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3132 struct snd_pcm_sync_ptr32 __user *src)
3133{
3134 struct snd_pcm_runtime *runtime = substream->runtime;
3135 volatile struct snd_pcm_mmap_status *status;
3136 volatile struct snd_pcm_mmap_control *control;
3137 u32 sflags;
3138 struct snd_pcm_mmap_control scontrol;
3139 struct snd_pcm_mmap_status sstatus;
3140 snd_pcm_uframes_t boundary;
3141 int err;
3142
3143 if (snd_BUG_ON(!runtime))
3144 return -EINVAL;
3145
3146 if (get_user(sflags, &src->flags) ||
3147 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3148 get_user(scontrol.avail_min, &src->c.control.avail_min))
3149 return -EFAULT;
3150 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3151 err = snd_pcm_hwsync(substream);
3152 if (err < 0)
3153 return err;
3154 }
3155 status = runtime->status;
3156 control = runtime->control;
3157 boundary = recalculate_boundary(runtime);
3158 if (! boundary)
3159 boundary = 0x7fffffff;
3160 scoped_guard(pcm_stream_lock_irq, substream) {
3161 /* FIXME: we should consider the boundary for the sync from app */
3162 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3163 err = pcm_lib_apply_appl_ptr(substream,
3164 scontrol.appl_ptr);
3165 if (err < 0)
3166 return err;
3167 } else
3168 scontrol.appl_ptr = control->appl_ptr % boundary;
3169 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3170 control->avail_min = scontrol.avail_min;
3171 else
3172 scontrol.avail_min = control->avail_min;
3173 sstatus.state = status->state;
3174 sstatus.hw_ptr = status->hw_ptr % boundary;
3175 sstatus.tstamp = status->tstamp;
3176 sstatus.suspended_state = status->suspended_state;
3177 sstatus.audio_tstamp = status->audio_tstamp;
3178 }
3179 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3180 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3181 if (put_user(sstatus.state, &src->s.status.state) ||
3182 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3183 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3184 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3185 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3186 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3187 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3188 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3189 put_user(scontrol.avail_min, &src->c.control.avail_min))
3190 return -EFAULT;
3191
3192 return 0;
3193}
3194#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3195
3196static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3197{
3198 struct snd_pcm_runtime *runtime = substream->runtime;
3199 int arg;
3200
3201 if (get_user(arg, _arg))
3202 return -EFAULT;
3203 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3204 return -EINVAL;
3205 runtime->tstamp_type = arg;
3206 return 0;
3207}
3208
3209static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3210 struct snd_xferi __user *_xferi)
3211{
3212 struct snd_xferi xferi;
3213 struct snd_pcm_runtime *runtime = substream->runtime;
3214 snd_pcm_sframes_t result;
3215
3216 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3217 return -EBADFD;
3218 if (put_user(0, &_xferi->result))
3219 return -EFAULT;
3220 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3221 return -EFAULT;
3222 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3223 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3224 else
3225 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3226 if (put_user(result, &_xferi->result))
3227 return -EFAULT;
3228 return result < 0 ? result : 0;
3229}
3230
3231static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3232 struct snd_xfern __user *_xfern)
3233{
3234 struct snd_xfern xfern;
3235 struct snd_pcm_runtime *runtime = substream->runtime;
3236 void *bufs __free(kfree) = NULL;
3237 snd_pcm_sframes_t result;
3238
3239 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3240 return -EBADFD;
3241 if (runtime->channels > 128)
3242 return -EINVAL;
3243 if (put_user(0, &_xfern->result))
3244 return -EFAULT;
3245 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3246 return -EFAULT;
3247
3248 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3249 if (IS_ERR(bufs))
3250 return PTR_ERR(bufs);
3251 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3252 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3253 else
3254 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3255 if (put_user(result, &_xfern->result))
3256 return -EFAULT;
3257 return result < 0 ? result : 0;
3258}
3259
3260static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3261 snd_pcm_uframes_t __user *_frames)
3262{
3263 snd_pcm_uframes_t frames;
3264 snd_pcm_sframes_t result;
3265
3266 if (get_user(frames, _frames))
3267 return -EFAULT;
3268 if (put_user(0, _frames))
3269 return -EFAULT;
3270 result = snd_pcm_rewind(substream, frames);
3271 if (put_user(result, _frames))
3272 return -EFAULT;
3273 return result < 0 ? result : 0;
3274}
3275
3276static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3277 snd_pcm_uframes_t __user *_frames)
3278{
3279 snd_pcm_uframes_t frames;
3280 snd_pcm_sframes_t result;
3281
3282 if (get_user(frames, _frames))
3283 return -EFAULT;
3284 if (put_user(0, _frames))
3285 return -EFAULT;
3286 result = snd_pcm_forward(substream, frames);
3287 if (put_user(result, _frames))
3288 return -EFAULT;
3289 return result < 0 ? result : 0;
3290}
3291
3292static int snd_pcm_common_ioctl(struct file *file,
3293 struct snd_pcm_substream *substream,
3294 unsigned int cmd, void __user *arg)
3295{
3296 struct snd_pcm_file *pcm_file = file->private_data;
3297 int res;
3298
3299 if (PCM_RUNTIME_CHECK(substream))
3300 return -ENXIO;
3301
3302 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3303 return -EBADFD;
3304
3305 res = snd_power_wait(substream->pcm->card);
3306 if (res < 0)
3307 return res;
3308
3309 switch (cmd) {
3310 case SNDRV_PCM_IOCTL_PVERSION:
3311 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3312 case SNDRV_PCM_IOCTL_INFO:
3313 return snd_pcm_info_user(substream, arg);
3314 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3315 return 0;
3316 case SNDRV_PCM_IOCTL_TTSTAMP:
3317 return snd_pcm_tstamp(substream, arg);
3318 case SNDRV_PCM_IOCTL_USER_PVERSION:
3319 if (get_user(pcm_file->user_pversion,
3320 (unsigned int __user *)arg))
3321 return -EFAULT;
3322 return 0;
3323 case SNDRV_PCM_IOCTL_HW_REFINE:
3324 return snd_pcm_hw_refine_user(substream, arg);
3325 case SNDRV_PCM_IOCTL_HW_PARAMS:
3326 return snd_pcm_hw_params_user(substream, arg);
3327 case SNDRV_PCM_IOCTL_HW_FREE:
3328 return snd_pcm_hw_free(substream);
3329 case SNDRV_PCM_IOCTL_SW_PARAMS:
3330 return snd_pcm_sw_params_user(substream, arg);
3331 case SNDRV_PCM_IOCTL_STATUS32:
3332 return snd_pcm_status_user32(substream, arg, false);
3333 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3334 return snd_pcm_status_user32(substream, arg, true);
3335 case SNDRV_PCM_IOCTL_STATUS64:
3336 return snd_pcm_status_user64(substream, arg, false);
3337 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3338 return snd_pcm_status_user64(substream, arg, true);
3339 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3340 return snd_pcm_channel_info_user(substream, arg);
3341 case SNDRV_PCM_IOCTL_PREPARE:
3342 return snd_pcm_prepare(substream, file);
3343 case SNDRV_PCM_IOCTL_RESET:
3344 return snd_pcm_reset(substream);
3345 case SNDRV_PCM_IOCTL_START:
3346 return snd_pcm_start_lock_irq(substream);
3347 case SNDRV_PCM_IOCTL_LINK:
3348 return snd_pcm_link(substream, (int)(unsigned long) arg);
3349 case SNDRV_PCM_IOCTL_UNLINK:
3350 return snd_pcm_unlink(substream);
3351 case SNDRV_PCM_IOCTL_RESUME:
3352 return snd_pcm_resume(substream);
3353 case SNDRV_PCM_IOCTL_XRUN:
3354 return snd_pcm_xrun(substream);
3355 case SNDRV_PCM_IOCTL_HWSYNC:
3356 return snd_pcm_hwsync(substream);
3357 case SNDRV_PCM_IOCTL_DELAY:
3358 {
3359 snd_pcm_sframes_t delay = 0;
3360 snd_pcm_sframes_t __user *res = arg;
3361 int err;
3362
3363 err = snd_pcm_delay(substream, &delay);
3364 if (err)
3365 return err;
3366 if (put_user(delay, res))
3367 return -EFAULT;
3368 return 0;
3369 }
3370 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3371 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3372 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3373 return snd_pcm_sync_ptr(substream, arg);
3374#ifdef CONFIG_SND_SUPPORT_OLD_API
3375 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3376 return snd_pcm_hw_refine_old_user(substream, arg);
3377 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3378 return snd_pcm_hw_params_old_user(substream, arg);
3379#endif
3380 case SNDRV_PCM_IOCTL_DRAIN:
3381 return snd_pcm_drain(substream, file);
3382 case SNDRV_PCM_IOCTL_DROP:
3383 return snd_pcm_drop(substream);
3384 case SNDRV_PCM_IOCTL_PAUSE:
3385 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3386 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3387 case SNDRV_PCM_IOCTL_READI_FRAMES:
3388 return snd_pcm_xferi_frames_ioctl(substream, arg);
3389 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3390 case SNDRV_PCM_IOCTL_READN_FRAMES:
3391 return snd_pcm_xfern_frames_ioctl(substream, arg);
3392 case SNDRV_PCM_IOCTL_REWIND:
3393 return snd_pcm_rewind_ioctl(substream, arg);
3394 case SNDRV_PCM_IOCTL_FORWARD:
3395 return snd_pcm_forward_ioctl(substream, arg);
3396 }
3397 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3398 return -ENOTTY;
3399}
3400
3401static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3402 unsigned long arg)
3403{
3404 struct snd_pcm_file *pcm_file;
3405
3406 pcm_file = file->private_data;
3407
3408 if (((cmd >> 8) & 0xff) != 'A')
3409 return -ENOTTY;
3410
3411 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3412 (void __user *)arg);
3413}
3414
3415/**
3416 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3417 * @substream: PCM substream
3418 * @cmd: IOCTL cmd
3419 * @arg: IOCTL argument
3420 *
3421 * The function is provided primarily for OSS layer and USB gadget drivers,
3422 * and it allows only the limited set of ioctls (hw_params, sw_params,
3423 * prepare, start, drain, drop, forward).
3424 *
3425 * Return: zero if successful, or a negative error code
3426 */
3427int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3428 unsigned int cmd, void *arg)
3429{
3430 snd_pcm_uframes_t *frames = arg;
3431 snd_pcm_sframes_t result;
3432
3433 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3434 return -EBADFD;
3435
3436 switch (cmd) {
3437 case SNDRV_PCM_IOCTL_FORWARD:
3438 {
3439 /* provided only for OSS; capture-only and no value returned */
3440 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3441 return -EINVAL;
3442 result = snd_pcm_forward(substream, *frames);
3443 return result < 0 ? result : 0;
3444 }
3445 case SNDRV_PCM_IOCTL_HW_PARAMS:
3446 return snd_pcm_hw_params(substream, arg);
3447 case SNDRV_PCM_IOCTL_SW_PARAMS:
3448 return snd_pcm_sw_params(substream, arg);
3449 case SNDRV_PCM_IOCTL_PREPARE:
3450 return snd_pcm_prepare(substream, NULL);
3451 case SNDRV_PCM_IOCTL_START:
3452 return snd_pcm_start_lock_irq(substream);
3453 case SNDRV_PCM_IOCTL_DRAIN:
3454 return snd_pcm_drain(substream, NULL);
3455 case SNDRV_PCM_IOCTL_DROP:
3456 return snd_pcm_drop(substream);
3457 case SNDRV_PCM_IOCTL_DELAY:
3458 return snd_pcm_delay(substream, frames);
3459 default:
3460 return -EINVAL;
3461 }
3462}
3463EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3464
3465static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3466 loff_t * offset)
3467{
3468 struct snd_pcm_file *pcm_file;
3469 struct snd_pcm_substream *substream;
3470 struct snd_pcm_runtime *runtime;
3471 snd_pcm_sframes_t result;
3472
3473 pcm_file = file->private_data;
3474 substream = pcm_file->substream;
3475 if (PCM_RUNTIME_CHECK(substream))
3476 return -ENXIO;
3477 runtime = substream->runtime;
3478 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3479 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3480 return -EBADFD;
3481 if (!frame_aligned(runtime, count))
3482 return -EINVAL;
3483 count = bytes_to_frames(runtime, count);
3484 result = snd_pcm_lib_read(substream, buf, count);
3485 if (result > 0)
3486 result = frames_to_bytes(runtime, result);
3487 return result;
3488}
3489
3490static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3491 size_t count, loff_t * offset)
3492{
3493 struct snd_pcm_file *pcm_file;
3494 struct snd_pcm_substream *substream;
3495 struct snd_pcm_runtime *runtime;
3496 snd_pcm_sframes_t result;
3497
3498 pcm_file = file->private_data;
3499 substream = pcm_file->substream;
3500 if (PCM_RUNTIME_CHECK(substream))
3501 return -ENXIO;
3502 runtime = substream->runtime;
3503 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3504 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3505 return -EBADFD;
3506 if (!frame_aligned(runtime, count))
3507 return -EINVAL;
3508 count = bytes_to_frames(runtime, count);
3509 result = snd_pcm_lib_write(substream, buf, count);
3510 if (result > 0)
3511 result = frames_to_bytes(runtime, result);
3512 return result;
3513}
3514
3515static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3516{
3517 struct snd_pcm_file *pcm_file;
3518 struct snd_pcm_substream *substream;
3519 struct snd_pcm_runtime *runtime;
3520 snd_pcm_sframes_t result;
3521 unsigned long i;
3522 void __user **bufs __free(kfree) = NULL;
3523 snd_pcm_uframes_t frames;
3524 const struct iovec *iov = iter_iov(to);
3525
3526 pcm_file = iocb->ki_filp->private_data;
3527 substream = pcm_file->substream;
3528 if (PCM_RUNTIME_CHECK(substream))
3529 return -ENXIO;
3530 runtime = substream->runtime;
3531 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3532 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3533 return -EBADFD;
3534 if (!user_backed_iter(to))
3535 return -EINVAL;
3536 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3537 return -EINVAL;
3538 if (!frame_aligned(runtime, iov->iov_len))
3539 return -EINVAL;
3540 frames = bytes_to_samples(runtime, iov->iov_len);
3541 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3542 if (bufs == NULL)
3543 return -ENOMEM;
3544 for (i = 0; i < to->nr_segs; ++i) {
3545 bufs[i] = iov->iov_base;
3546 iov++;
3547 }
3548 result = snd_pcm_lib_readv(substream, bufs, frames);
3549 if (result > 0)
3550 result = frames_to_bytes(runtime, result);
3551 return result;
3552}
3553
3554static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3555{
3556 struct snd_pcm_file *pcm_file;
3557 struct snd_pcm_substream *substream;
3558 struct snd_pcm_runtime *runtime;
3559 snd_pcm_sframes_t result;
3560 unsigned long i;
3561 void __user **bufs __free(kfree) = NULL;
3562 snd_pcm_uframes_t frames;
3563 const struct iovec *iov = iter_iov(from);
3564
3565 pcm_file = iocb->ki_filp->private_data;
3566 substream = pcm_file->substream;
3567 if (PCM_RUNTIME_CHECK(substream))
3568 return -ENXIO;
3569 runtime = substream->runtime;
3570 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3571 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3572 return -EBADFD;
3573 if (!user_backed_iter(from))
3574 return -EINVAL;
3575 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3576 !frame_aligned(runtime, iov->iov_len))
3577 return -EINVAL;
3578 frames = bytes_to_samples(runtime, iov->iov_len);
3579 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3580 if (bufs == NULL)
3581 return -ENOMEM;
3582 for (i = 0; i < from->nr_segs; ++i) {
3583 bufs[i] = iov->iov_base;
3584 iov++;
3585 }
3586 result = snd_pcm_lib_writev(substream, bufs, frames);
3587 if (result > 0)
3588 result = frames_to_bytes(runtime, result);
3589 return result;
3590}
3591
3592static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3593{
3594 struct snd_pcm_file *pcm_file;
3595 struct snd_pcm_substream *substream;
3596 struct snd_pcm_runtime *runtime;
3597 __poll_t mask, ok;
3598 snd_pcm_uframes_t avail;
3599
3600 pcm_file = file->private_data;
3601
3602 substream = pcm_file->substream;
3603 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3604 ok = EPOLLOUT | EPOLLWRNORM;
3605 else
3606 ok = EPOLLIN | EPOLLRDNORM;
3607 if (PCM_RUNTIME_CHECK(substream))
3608 return ok | EPOLLERR;
3609
3610 runtime = substream->runtime;
3611 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3612 return ok | EPOLLERR;
3613
3614 poll_wait(file, &runtime->sleep, wait);
3615
3616 mask = 0;
3617 guard(pcm_stream_lock_irq)(substream);
3618 avail = snd_pcm_avail(substream);
3619 switch (runtime->state) {
3620 case SNDRV_PCM_STATE_RUNNING:
3621 case SNDRV_PCM_STATE_PREPARED:
3622 case SNDRV_PCM_STATE_PAUSED:
3623 if (avail >= runtime->control->avail_min)
3624 mask = ok;
3625 break;
3626 case SNDRV_PCM_STATE_DRAINING:
3627 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3628 mask = ok;
3629 if (!avail)
3630 mask |= EPOLLERR;
3631 }
3632 break;
3633 default:
3634 mask = ok | EPOLLERR;
3635 break;
3636 }
3637 return mask;
3638}
3639
3640/*
3641 * mmap support
3642 */
3643
3644/*
3645 * Only on coherent architectures, we can mmap the status and the control records
3646 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3647 */
3648#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3649/*
3650 * mmap status record
3651 */
3652static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3653{
3654 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3655 struct snd_pcm_runtime *runtime;
3656
3657 if (substream == NULL)
3658 return VM_FAULT_SIGBUS;
3659 runtime = substream->runtime;
3660 vmf->page = virt_to_page(runtime->status);
3661 get_page(vmf->page);
3662 return 0;
3663}
3664
3665static const struct vm_operations_struct snd_pcm_vm_ops_status =
3666{
3667 .fault = snd_pcm_mmap_status_fault,
3668};
3669
3670static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3671 struct vm_area_struct *area)
3672{
3673 long size;
3674 if (!(area->vm_flags & VM_READ))
3675 return -EINVAL;
3676 size = area->vm_end - area->vm_start;
3677 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3678 return -EINVAL;
3679 area->vm_ops = &snd_pcm_vm_ops_status;
3680 area->vm_private_data = substream;
3681 vm_flags_mod(area, VM_DONTEXPAND | VM_DONTDUMP,
3682 VM_WRITE | VM_MAYWRITE);
3683
3684 return 0;
3685}
3686
3687/*
3688 * mmap control record
3689 */
3690static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3691{
3692 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3693 struct snd_pcm_runtime *runtime;
3694
3695 if (substream == NULL)
3696 return VM_FAULT_SIGBUS;
3697 runtime = substream->runtime;
3698 vmf->page = virt_to_page(runtime->control);
3699 get_page(vmf->page);
3700 return 0;
3701}
3702
3703static const struct vm_operations_struct snd_pcm_vm_ops_control =
3704{
3705 .fault = snd_pcm_mmap_control_fault,
3706};
3707
3708static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3709 struct vm_area_struct *area)
3710{
3711 long size;
3712 if (!(area->vm_flags & VM_READ))
3713 return -EINVAL;
3714 size = area->vm_end - area->vm_start;
3715 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3716 return -EINVAL;
3717 area->vm_ops = &snd_pcm_vm_ops_control;
3718 area->vm_private_data = substream;
3719 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3720 return 0;
3721}
3722
3723static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3724{
3725 /* If drivers require the explicit sync (typically for non-coherent
3726 * pages), we have to disable the mmap of status and control data
3727 * to enforce the control via SYNC_PTR ioctl.
3728 */
3729 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3730 return false;
3731 /* See pcm_control_mmap_allowed() below.
3732 * Since older alsa-lib requires both status and control mmaps to be
3733 * coupled, we have to disable the status mmap for old alsa-lib, too.
3734 */
3735 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3736 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3737 return false;
3738 return true;
3739}
3740
3741static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3742{
3743 if (pcm_file->no_compat_mmap)
3744 return false;
3745 /* see above */
3746 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3747 return false;
3748 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3749 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3750 * thus it effectively assures the manual update of appl_ptr.
3751 */
3752 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3753 return false;
3754 return true;
3755}
3756
3757#else /* ! coherent mmap */
3758/*
3759 * don't support mmap for status and control records.
3760 */
3761#define pcm_status_mmap_allowed(pcm_file) false
3762#define pcm_control_mmap_allowed(pcm_file) false
3763
3764static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3765 struct vm_area_struct *area)
3766{
3767 return -ENXIO;
3768}
3769static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3770 struct vm_area_struct *area)
3771{
3772 return -ENXIO;
3773}
3774#endif /* coherent mmap */
3775
3776/*
3777 * snd_pcm_mmap_data_open - increase the mmap counter
3778 */
3779static void snd_pcm_mmap_data_open(struct vm_area_struct *area)
3780{
3781 struct snd_pcm_substream *substream = area->vm_private_data;
3782
3783 atomic_inc(&substream->mmap_count);
3784}
3785
3786/*
3787 * snd_pcm_mmap_data_close - decrease the mmap counter
3788 */
3789static void snd_pcm_mmap_data_close(struct vm_area_struct *area)
3790{
3791 struct snd_pcm_substream *substream = area->vm_private_data;
3792
3793 atomic_dec(&substream->mmap_count);
3794}
3795
3796/*
3797 * fault callback for mmapping a RAM page
3798 */
3799static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3800{
3801 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3802 struct snd_pcm_runtime *runtime;
3803 unsigned long offset;
3804 struct page * page;
3805 size_t dma_bytes;
3806
3807 if (substream == NULL)
3808 return VM_FAULT_SIGBUS;
3809 runtime = substream->runtime;
3810 offset = vmf->pgoff << PAGE_SHIFT;
3811 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3812 if (offset > dma_bytes - PAGE_SIZE)
3813 return VM_FAULT_SIGBUS;
3814 if (substream->ops->page)
3815 page = substream->ops->page(substream, offset);
3816 else if (!snd_pcm_get_dma_buf(substream)) {
3817 if (WARN_ON_ONCE(!runtime->dma_area))
3818 return VM_FAULT_SIGBUS;
3819 page = virt_to_page(runtime->dma_area + offset);
3820 } else
3821 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3822 if (!page)
3823 return VM_FAULT_SIGBUS;
3824 get_page(page);
3825 vmf->page = page;
3826 return 0;
3827}
3828
3829static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3830 .open = snd_pcm_mmap_data_open,
3831 .close = snd_pcm_mmap_data_close,
3832};
3833
3834static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3835 .open = snd_pcm_mmap_data_open,
3836 .close = snd_pcm_mmap_data_close,
3837 .fault = snd_pcm_mmap_data_fault,
3838};
3839
3840/*
3841 * mmap the DMA buffer on RAM
3842 */
3843
3844/**
3845 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3846 * @substream: PCM substream
3847 * @area: VMA
3848 *
3849 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3850 * this function is invoked implicitly.
3851 *
3852 * Return: zero if successful, or a negative error code
3853 */
3854int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3855 struct vm_area_struct *area)
3856{
3857 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3858 if (!substream->ops->page &&
3859 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3860 return 0;
3861 /* mmap with fault handler */
3862 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3863 return 0;
3864}
3865EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3866
3867/*
3868 * mmap the DMA buffer on I/O memory area
3869 */
3870#if SNDRV_PCM_INFO_MMAP_IOMEM
3871/**
3872 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3873 * @substream: PCM substream
3874 * @area: VMA
3875 *
3876 * When your hardware uses the iomapped pages as the hardware buffer and
3877 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3878 * is supposed to work only on limited architectures.
3879 *
3880 * Return: zero if successful, or a negative error code
3881 */
3882int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3883 struct vm_area_struct *area)
3884{
3885 struct snd_pcm_runtime *runtime = substream->runtime;
3886
3887 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3888 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3889}
3890EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3891#endif /* SNDRV_PCM_INFO_MMAP */
3892
3893/*
3894 * mmap DMA buffer
3895 */
3896int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3897 struct vm_area_struct *area)
3898{
3899 struct snd_pcm_runtime *runtime;
3900 long size;
3901 unsigned long offset;
3902 size_t dma_bytes;
3903 int err;
3904
3905 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3906 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3907 return -EINVAL;
3908 } else {
3909 if (!(area->vm_flags & VM_READ))
3910 return -EINVAL;
3911 }
3912 runtime = substream->runtime;
3913 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3914 return -EBADFD;
3915 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3916 return -ENXIO;
3917 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3918 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3919 return -EINVAL;
3920 size = area->vm_end - area->vm_start;
3921 offset = area->vm_pgoff << PAGE_SHIFT;
3922 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3923 if ((size_t)size > dma_bytes)
3924 return -EINVAL;
3925 if (offset > dma_bytes - size)
3926 return -EINVAL;
3927
3928 area->vm_ops = &snd_pcm_vm_ops_data;
3929 area->vm_private_data = substream;
3930 if (substream->ops->mmap)
3931 err = substream->ops->mmap(substream, area);
3932 else
3933 err = snd_pcm_lib_default_mmap(substream, area);
3934 if (!err)
3935 atomic_inc(&substream->mmap_count);
3936 return err;
3937}
3938EXPORT_SYMBOL(snd_pcm_mmap_data);
3939
3940static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3941{
3942 struct snd_pcm_file * pcm_file;
3943 struct snd_pcm_substream *substream;
3944 unsigned long offset;
3945
3946 pcm_file = file->private_data;
3947 substream = pcm_file->substream;
3948 if (PCM_RUNTIME_CHECK(substream))
3949 return -ENXIO;
3950 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3951 return -EBADFD;
3952
3953 offset = area->vm_pgoff << PAGE_SHIFT;
3954 switch (offset) {
3955 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3956 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3957 return -ENXIO;
3958 fallthrough;
3959 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3960 if (!pcm_status_mmap_allowed(pcm_file))
3961 return -ENXIO;
3962 return snd_pcm_mmap_status(substream, file, area);
3963 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3964 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3965 return -ENXIO;
3966 fallthrough;
3967 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3968 if (!pcm_control_mmap_allowed(pcm_file))
3969 return -ENXIO;
3970 return snd_pcm_mmap_control(substream, file, area);
3971 default:
3972 return snd_pcm_mmap_data(substream, file, area);
3973 }
3974 return 0;
3975}
3976
3977static int snd_pcm_fasync(int fd, struct file * file, int on)
3978{
3979 struct snd_pcm_file * pcm_file;
3980 struct snd_pcm_substream *substream;
3981 struct snd_pcm_runtime *runtime;
3982
3983 pcm_file = file->private_data;
3984 substream = pcm_file->substream;
3985 if (PCM_RUNTIME_CHECK(substream))
3986 return -ENXIO;
3987 runtime = substream->runtime;
3988 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3989 return -EBADFD;
3990 return snd_fasync_helper(fd, file, on, &runtime->fasync);
3991}
3992
3993/*
3994 * ioctl32 compat
3995 */
3996#ifdef CONFIG_COMPAT
3997#include "pcm_compat.c"
3998#else
3999#define snd_pcm_ioctl_compat NULL
4000#endif
4001
4002/*
4003 * To be removed helpers to keep binary compatibility
4004 */
4005
4006#ifdef CONFIG_SND_SUPPORT_OLD_API
4007#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
4008#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
4009
4010static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
4011 struct snd_pcm_hw_params_old *oparams)
4012{
4013 unsigned int i;
4014
4015 memset(params, 0, sizeof(*params));
4016 params->flags = oparams->flags;
4017 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4018 params->masks[i].bits[0] = oparams->masks[i];
4019 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
4020 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
4021 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
4022 params->info = oparams->info;
4023 params->msbits = oparams->msbits;
4024 params->rate_num = oparams->rate_num;
4025 params->rate_den = oparams->rate_den;
4026 params->fifo_size = oparams->fifo_size;
4027}
4028
4029static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
4030 struct snd_pcm_hw_params *params)
4031{
4032 unsigned int i;
4033
4034 memset(oparams, 0, sizeof(*oparams));
4035 oparams->flags = params->flags;
4036 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4037 oparams->masks[i] = params->masks[i].bits[0];
4038 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4039 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4040 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4041 oparams->info = params->info;
4042 oparams->msbits = params->msbits;
4043 oparams->rate_num = params->rate_num;
4044 oparams->rate_den = params->rate_den;
4045 oparams->fifo_size = params->fifo_size;
4046}
4047
4048static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4049 struct snd_pcm_hw_params_old __user * _oparams)
4050{
4051 struct snd_pcm_hw_params *params __free(kfree) = NULL;
4052 struct snd_pcm_hw_params_old *oparams __free(kfree) = NULL;
4053 int err;
4054
4055 params = kmalloc(sizeof(*params), GFP_KERNEL);
4056 if (!params)
4057 return -ENOMEM;
4058
4059 oparams = memdup_user(_oparams, sizeof(*oparams));
4060 if (IS_ERR(oparams))
4061 return PTR_ERR(oparams);
4062 snd_pcm_hw_convert_from_old_params(params, oparams);
4063 err = snd_pcm_hw_refine(substream, params);
4064 if (err < 0)
4065 return err;
4066
4067 err = fixup_unreferenced_params(substream, params);
4068 if (err < 0)
4069 return err;
4070
4071 snd_pcm_hw_convert_to_old_params(oparams, params);
4072 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4073 return -EFAULT;
4074 return 0;
4075}
4076
4077static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4078 struct snd_pcm_hw_params_old __user * _oparams)
4079{
4080 struct snd_pcm_hw_params *params __free(kfree) = NULL;
4081 struct snd_pcm_hw_params_old *oparams __free(kfree) = NULL;
4082 int err;
4083
4084 params = kmalloc(sizeof(*params), GFP_KERNEL);
4085 if (!params)
4086 return -ENOMEM;
4087
4088 oparams = memdup_user(_oparams, sizeof(*oparams));
4089 if (IS_ERR(oparams))
4090 return PTR_ERR(oparams);
4091
4092 snd_pcm_hw_convert_from_old_params(params, oparams);
4093 err = snd_pcm_hw_params(substream, params);
4094 if (err < 0)
4095 return err;
4096
4097 snd_pcm_hw_convert_to_old_params(oparams, params);
4098 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4099 return -EFAULT;
4100 return 0;
4101}
4102#endif /* CONFIG_SND_SUPPORT_OLD_API */
4103
4104#ifndef CONFIG_MMU
4105static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4106 unsigned long addr,
4107 unsigned long len,
4108 unsigned long pgoff,
4109 unsigned long flags)
4110{
4111 struct snd_pcm_file *pcm_file = file->private_data;
4112 struct snd_pcm_substream *substream = pcm_file->substream;
4113 struct snd_pcm_runtime *runtime = substream->runtime;
4114 unsigned long offset = pgoff << PAGE_SHIFT;
4115
4116 switch (offset) {
4117 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4118 return (unsigned long)runtime->status;
4119 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4120 return (unsigned long)runtime->control;
4121 default:
4122 return (unsigned long)runtime->dma_area + offset;
4123 }
4124}
4125#else
4126# define snd_pcm_get_unmapped_area NULL
4127#endif
4128
4129/*
4130 * Register section
4131 */
4132
4133const struct file_operations snd_pcm_f_ops[2] = {
4134 {
4135 .owner = THIS_MODULE,
4136 .write = snd_pcm_write,
4137 .write_iter = snd_pcm_writev,
4138 .open = snd_pcm_playback_open,
4139 .release = snd_pcm_release,
4140 .poll = snd_pcm_poll,
4141 .unlocked_ioctl = snd_pcm_ioctl,
4142 .compat_ioctl = snd_pcm_ioctl_compat,
4143 .mmap = snd_pcm_mmap,
4144 .fasync = snd_pcm_fasync,
4145 .get_unmapped_area = snd_pcm_get_unmapped_area,
4146 },
4147 {
4148 .owner = THIS_MODULE,
4149 .read = snd_pcm_read,
4150 .read_iter = snd_pcm_readv,
4151 .open = snd_pcm_capture_open,
4152 .release = snd_pcm_release,
4153 .poll = snd_pcm_poll,
4154 .unlocked_ioctl = snd_pcm_ioctl,
4155 .compat_ioctl = snd_pcm_ioctl_compat,
4156 .mmap = snd_pcm_mmap,
4157 .fasync = snd_pcm_fasync,
4158 .get_unmapped_area = snd_pcm_get_unmapped_area,
4159 }
4160};