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