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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 case SNDRV_PCM_STATE_SUSPENDED:
2641 err = 0;
2642 break;
2643 case SNDRV_PCM_STATE_XRUN:
2644 err = -EPIPE;
2645 break;
2646 default:
2647 __badfd:
2648 err = -EBADFD;
2649 break;
2650 }
2651 snd_pcm_stream_unlock_irq(substream);
2652 return err;
2653}
2654
2655static int snd_pcm_delay(struct snd_pcm_substream *substream,
2656 snd_pcm_sframes_t __user *res)
2657{
2658 struct snd_pcm_runtime *runtime = substream->runtime;
2659 int err;
2660 snd_pcm_sframes_t n = 0;
2661
2662 snd_pcm_stream_lock_irq(substream);
2663 switch (runtime->status->state) {
2664 case SNDRV_PCM_STATE_DRAINING:
2665 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2666 goto __badfd;
2667 /* Fall through */
2668 case SNDRV_PCM_STATE_RUNNING:
2669 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2670 break;
2671 /* Fall through */
2672 case SNDRV_PCM_STATE_PREPARED:
2673 case SNDRV_PCM_STATE_SUSPENDED:
2674 err = 0;
2675 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2676 n = snd_pcm_playback_hw_avail(runtime);
2677 else
2678 n = snd_pcm_capture_avail(runtime);
2679 n += runtime->delay;
2680 break;
2681 case SNDRV_PCM_STATE_XRUN:
2682 err = -EPIPE;
2683 break;
2684 default:
2685 __badfd:
2686 err = -EBADFD;
2687 break;
2688 }
2689 snd_pcm_stream_unlock_irq(substream);
2690 if (!err)
2691 if (put_user(n, res))
2692 err = -EFAULT;
2693 return err;
2694}
2695
2696static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2697 struct snd_pcm_sync_ptr __user *_sync_ptr)
2698{
2699 struct snd_pcm_runtime *runtime = substream->runtime;
2700 struct snd_pcm_sync_ptr sync_ptr;
2701 volatile struct snd_pcm_mmap_status *status;
2702 volatile struct snd_pcm_mmap_control *control;
2703 int err;
2704
2705 memset(&sync_ptr, 0, sizeof(sync_ptr));
2706 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2707 return -EFAULT;
2708 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2709 return -EFAULT;
2710 status = runtime->status;
2711 control = runtime->control;
2712 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2713 err = snd_pcm_hwsync(substream);
2714 if (err < 0)
2715 return err;
2716 }
2717 snd_pcm_stream_lock_irq(substream);
2718 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2719 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2720 else
2721 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2722 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2723 control->avail_min = sync_ptr.c.control.avail_min;
2724 else
2725 sync_ptr.c.control.avail_min = control->avail_min;
2726 sync_ptr.s.status.state = status->state;
2727 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2728 sync_ptr.s.status.tstamp = status->tstamp;
2729 sync_ptr.s.status.suspended_state = status->suspended_state;
2730 snd_pcm_stream_unlock_irq(substream);
2731 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2732 return -EFAULT;
2733 return 0;
2734}
2735
2736static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2737{
2738 struct snd_pcm_runtime *runtime = substream->runtime;
2739 int arg;
2740
2741 if (get_user(arg, _arg))
2742 return -EFAULT;
2743 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2744 return -EINVAL;
2745 runtime->tstamp_type = arg;
2746 return 0;
2747}
2748
2749static int snd_pcm_common_ioctl1(struct file *file,
2750 struct snd_pcm_substream *substream,
2751 unsigned int cmd, void __user *arg)
2752{
2753 switch (cmd) {
2754 case SNDRV_PCM_IOCTL_PVERSION:
2755 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2756 case SNDRV_PCM_IOCTL_INFO:
2757 return snd_pcm_info_user(substream, arg);
2758 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2759 return 0;
2760 case SNDRV_PCM_IOCTL_TTSTAMP:
2761 return snd_pcm_tstamp(substream, arg);
2762 case SNDRV_PCM_IOCTL_HW_REFINE:
2763 return snd_pcm_hw_refine_user(substream, arg);
2764 case SNDRV_PCM_IOCTL_HW_PARAMS:
2765 return snd_pcm_hw_params_user(substream, arg);
2766 case SNDRV_PCM_IOCTL_HW_FREE:
2767 return snd_pcm_hw_free(substream);
2768 case SNDRV_PCM_IOCTL_SW_PARAMS:
2769 return snd_pcm_sw_params_user(substream, arg);
2770 case SNDRV_PCM_IOCTL_STATUS:
2771 return snd_pcm_status_user(substream, arg, false);
2772 case SNDRV_PCM_IOCTL_STATUS_EXT:
2773 return snd_pcm_status_user(substream, arg, true);
2774 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2775 return snd_pcm_channel_info_user(substream, arg);
2776 case SNDRV_PCM_IOCTL_PREPARE:
2777 return snd_pcm_prepare(substream, file);
2778 case SNDRV_PCM_IOCTL_RESET:
2779 return snd_pcm_reset(substream);
2780 case SNDRV_PCM_IOCTL_START:
2781 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2782 case SNDRV_PCM_IOCTL_LINK:
2783 return snd_pcm_link(substream, (int)(unsigned long) arg);
2784 case SNDRV_PCM_IOCTL_UNLINK:
2785 return snd_pcm_unlink(substream);
2786 case SNDRV_PCM_IOCTL_RESUME:
2787 return snd_pcm_resume(substream);
2788 case SNDRV_PCM_IOCTL_XRUN:
2789 return snd_pcm_xrun(substream);
2790 case SNDRV_PCM_IOCTL_HWSYNC:
2791 return snd_pcm_hwsync(substream);
2792 case SNDRV_PCM_IOCTL_DELAY:
2793 return snd_pcm_delay(substream, arg);
2794 case SNDRV_PCM_IOCTL_SYNC_PTR:
2795 return snd_pcm_sync_ptr(substream, arg);
2796#ifdef CONFIG_SND_SUPPORT_OLD_API
2797 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2798 return snd_pcm_hw_refine_old_user(substream, arg);
2799 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2800 return snd_pcm_hw_params_old_user(substream, arg);
2801#endif
2802 case SNDRV_PCM_IOCTL_DRAIN:
2803 return snd_pcm_drain(substream, file);
2804 case SNDRV_PCM_IOCTL_DROP:
2805 return snd_pcm_drop(substream);
2806 case SNDRV_PCM_IOCTL_PAUSE:
2807 {
2808 int res;
2809 snd_pcm_stream_lock_irq(substream);
2810 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2811 snd_pcm_stream_unlock_irq(substream);
2812 return res;
2813 }
2814 }
2815 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2816 return -ENOTTY;
2817}
2818
2819static int snd_pcm_playback_ioctl1(struct file *file,
2820 struct snd_pcm_substream *substream,
2821 unsigned int cmd, void __user *arg)
2822{
2823 if (snd_BUG_ON(!substream))
2824 return -ENXIO;
2825 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2826 return -EINVAL;
2827 switch (cmd) {
2828 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2829 {
2830 struct snd_xferi xferi;
2831 struct snd_xferi __user *_xferi = arg;
2832 struct snd_pcm_runtime *runtime = substream->runtime;
2833 snd_pcm_sframes_t result;
2834 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2835 return -EBADFD;
2836 if (put_user(0, &_xferi->result))
2837 return -EFAULT;
2838 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2839 return -EFAULT;
2840 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2841 __put_user(result, &_xferi->result);
2842 return result < 0 ? result : 0;
2843 }
2844 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2845 {
2846 struct snd_xfern xfern;
2847 struct snd_xfern __user *_xfern = arg;
2848 struct snd_pcm_runtime *runtime = substream->runtime;
2849 void __user **bufs;
2850 snd_pcm_sframes_t result;
2851 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2852 return -EBADFD;
2853 if (runtime->channels > 128)
2854 return -EINVAL;
2855 if (put_user(0, &_xfern->result))
2856 return -EFAULT;
2857 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2858 return -EFAULT;
2859
2860 bufs = memdup_user(xfern.bufs,
2861 sizeof(void *) * runtime->channels);
2862 if (IS_ERR(bufs))
2863 return PTR_ERR(bufs);
2864 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2865 kfree(bufs);
2866 __put_user(result, &_xfern->result);
2867 return result < 0 ? result : 0;
2868 }
2869 case SNDRV_PCM_IOCTL_REWIND:
2870 {
2871 snd_pcm_uframes_t frames;
2872 snd_pcm_uframes_t __user *_frames = arg;
2873 snd_pcm_sframes_t result;
2874 if (get_user(frames, _frames))
2875 return -EFAULT;
2876 if (put_user(0, _frames))
2877 return -EFAULT;
2878 result = snd_pcm_playback_rewind(substream, frames);
2879 __put_user(result, _frames);
2880 return result < 0 ? result : 0;
2881 }
2882 case SNDRV_PCM_IOCTL_FORWARD:
2883 {
2884 snd_pcm_uframes_t frames;
2885 snd_pcm_uframes_t __user *_frames = arg;
2886 snd_pcm_sframes_t result;
2887 if (get_user(frames, _frames))
2888 return -EFAULT;
2889 if (put_user(0, _frames))
2890 return -EFAULT;
2891 result = snd_pcm_playback_forward(substream, frames);
2892 __put_user(result, _frames);
2893 return result < 0 ? result : 0;
2894 }
2895 }
2896 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2897}
2898
2899static int snd_pcm_capture_ioctl1(struct file *file,
2900 struct snd_pcm_substream *substream,
2901 unsigned int cmd, void __user *arg)
2902{
2903 if (snd_BUG_ON(!substream))
2904 return -ENXIO;
2905 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2906 return -EINVAL;
2907 switch (cmd) {
2908 case SNDRV_PCM_IOCTL_READI_FRAMES:
2909 {
2910 struct snd_xferi xferi;
2911 struct snd_xferi __user *_xferi = arg;
2912 struct snd_pcm_runtime *runtime = substream->runtime;
2913 snd_pcm_sframes_t result;
2914 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2915 return -EBADFD;
2916 if (put_user(0, &_xferi->result))
2917 return -EFAULT;
2918 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2919 return -EFAULT;
2920 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2921 __put_user(result, &_xferi->result);
2922 return result < 0 ? result : 0;
2923 }
2924 case SNDRV_PCM_IOCTL_READN_FRAMES:
2925 {
2926 struct snd_xfern xfern;
2927 struct snd_xfern __user *_xfern = arg;
2928 struct snd_pcm_runtime *runtime = substream->runtime;
2929 void *bufs;
2930 snd_pcm_sframes_t result;
2931 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932 return -EBADFD;
2933 if (runtime->channels > 128)
2934 return -EINVAL;
2935 if (put_user(0, &_xfern->result))
2936 return -EFAULT;
2937 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2938 return -EFAULT;
2939
2940 bufs = memdup_user(xfern.bufs,
2941 sizeof(void *) * runtime->channels);
2942 if (IS_ERR(bufs))
2943 return PTR_ERR(bufs);
2944 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2945 kfree(bufs);
2946 __put_user(result, &_xfern->result);
2947 return result < 0 ? result : 0;
2948 }
2949 case SNDRV_PCM_IOCTL_REWIND:
2950 {
2951 snd_pcm_uframes_t frames;
2952 snd_pcm_uframes_t __user *_frames = arg;
2953 snd_pcm_sframes_t result;
2954 if (get_user(frames, _frames))
2955 return -EFAULT;
2956 if (put_user(0, _frames))
2957 return -EFAULT;
2958 result = snd_pcm_capture_rewind(substream, frames);
2959 __put_user(result, _frames);
2960 return result < 0 ? result : 0;
2961 }
2962 case SNDRV_PCM_IOCTL_FORWARD:
2963 {
2964 snd_pcm_uframes_t frames;
2965 snd_pcm_uframes_t __user *_frames = arg;
2966 snd_pcm_sframes_t result;
2967 if (get_user(frames, _frames))
2968 return -EFAULT;
2969 if (put_user(0, _frames))
2970 return -EFAULT;
2971 result = snd_pcm_capture_forward(substream, frames);
2972 __put_user(result, _frames);
2973 return result < 0 ? result : 0;
2974 }
2975 }
2976 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2977}
2978
2979static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2980 unsigned long arg)
2981{
2982 struct snd_pcm_file *pcm_file;
2983
2984 pcm_file = file->private_data;
2985
2986 if (((cmd >> 8) & 0xff) != 'A')
2987 return -ENOTTY;
2988
2989 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2990 (void __user *)arg);
2991}
2992
2993static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2994 unsigned long arg)
2995{
2996 struct snd_pcm_file *pcm_file;
2997
2998 pcm_file = file->private_data;
2999
3000 if (((cmd >> 8) & 0xff) != 'A')
3001 return -ENOTTY;
3002
3003 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3004 (void __user *)arg);
3005}
3006
3007int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3008 unsigned int cmd, void *arg)
3009{
3010 mm_segment_t fs;
3011 int result;
3012
3013 fs = snd_enter_user();
3014 switch (substream->stream) {
3015 case SNDRV_PCM_STREAM_PLAYBACK:
3016 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3017 (void __user *)arg);
3018 break;
3019 case SNDRV_PCM_STREAM_CAPTURE:
3020 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3021 (void __user *)arg);
3022 break;
3023 default:
3024 result = -EINVAL;
3025 break;
3026 }
3027 snd_leave_user(fs);
3028 return result;
3029}
3030
3031EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3032
3033static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3034 loff_t * offset)
3035{
3036 struct snd_pcm_file *pcm_file;
3037 struct snd_pcm_substream *substream;
3038 struct snd_pcm_runtime *runtime;
3039 snd_pcm_sframes_t result;
3040
3041 pcm_file = file->private_data;
3042 substream = pcm_file->substream;
3043 if (PCM_RUNTIME_CHECK(substream))
3044 return -ENXIO;
3045 runtime = substream->runtime;
3046 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3047 return -EBADFD;
3048 if (!frame_aligned(runtime, count))
3049 return -EINVAL;
3050 count = bytes_to_frames(runtime, count);
3051 result = snd_pcm_lib_read(substream, buf, count);
3052 if (result > 0)
3053 result = frames_to_bytes(runtime, result);
3054 return result;
3055}
3056
3057static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3058 size_t count, loff_t * offset)
3059{
3060 struct snd_pcm_file *pcm_file;
3061 struct snd_pcm_substream *substream;
3062 struct snd_pcm_runtime *runtime;
3063 snd_pcm_sframes_t result;
3064
3065 pcm_file = file->private_data;
3066 substream = pcm_file->substream;
3067 if (PCM_RUNTIME_CHECK(substream))
3068 return -ENXIO;
3069 runtime = substream->runtime;
3070 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3071 return -EBADFD;
3072 if (!frame_aligned(runtime, count))
3073 return -EINVAL;
3074 count = bytes_to_frames(runtime, count);
3075 result = snd_pcm_lib_write(substream, buf, count);
3076 if (result > 0)
3077 result = frames_to_bytes(runtime, result);
3078 return result;
3079}
3080
3081static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3082{
3083 struct snd_pcm_file *pcm_file;
3084 struct snd_pcm_substream *substream;
3085 struct snd_pcm_runtime *runtime;
3086 snd_pcm_sframes_t result;
3087 unsigned long i;
3088 void __user **bufs;
3089 snd_pcm_uframes_t frames;
3090
3091 pcm_file = iocb->ki_filp->private_data;
3092 substream = pcm_file->substream;
3093 if (PCM_RUNTIME_CHECK(substream))
3094 return -ENXIO;
3095 runtime = substream->runtime;
3096 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3097 return -EBADFD;
3098 if (!iter_is_iovec(to))
3099 return -EINVAL;
3100 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3101 return -EINVAL;
3102 if (!frame_aligned(runtime, to->iov->iov_len))
3103 return -EINVAL;
3104 frames = bytes_to_samples(runtime, to->iov->iov_len);
3105 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3106 if (bufs == NULL)
3107 return -ENOMEM;
3108 for (i = 0; i < to->nr_segs; ++i)
3109 bufs[i] = to->iov[i].iov_base;
3110 result = snd_pcm_lib_readv(substream, bufs, frames);
3111 if (result > 0)
3112 result = frames_to_bytes(runtime, result);
3113 kfree(bufs);
3114 return result;
3115}
3116
3117static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3118{
3119 struct snd_pcm_file *pcm_file;
3120 struct snd_pcm_substream *substream;
3121 struct snd_pcm_runtime *runtime;
3122 snd_pcm_sframes_t result;
3123 unsigned long i;
3124 void __user **bufs;
3125 snd_pcm_uframes_t frames;
3126
3127 pcm_file = iocb->ki_filp->private_data;
3128 substream = pcm_file->substream;
3129 if (PCM_RUNTIME_CHECK(substream))
3130 return -ENXIO;
3131 runtime = substream->runtime;
3132 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3133 return -EBADFD;
3134 if (!iter_is_iovec(from))
3135 return -EINVAL;
3136 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3137 !frame_aligned(runtime, from->iov->iov_len))
3138 return -EINVAL;
3139 frames = bytes_to_samples(runtime, from->iov->iov_len);
3140 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3141 if (bufs == NULL)
3142 return -ENOMEM;
3143 for (i = 0; i < from->nr_segs; ++i)
3144 bufs[i] = from->iov[i].iov_base;
3145 result = snd_pcm_lib_writev(substream, bufs, frames);
3146 if (result > 0)
3147 result = frames_to_bytes(runtime, result);
3148 kfree(bufs);
3149 return result;
3150}
3151
3152static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3153{
3154 struct snd_pcm_file *pcm_file;
3155 struct snd_pcm_substream *substream;
3156 struct snd_pcm_runtime *runtime;
3157 unsigned int mask;
3158 snd_pcm_uframes_t avail;
3159
3160 pcm_file = file->private_data;
3161
3162 substream = pcm_file->substream;
3163 if (PCM_RUNTIME_CHECK(substream))
3164 return -ENXIO;
3165 runtime = substream->runtime;
3166
3167 poll_wait(file, &runtime->sleep, wait);
3168
3169 snd_pcm_stream_lock_irq(substream);
3170 avail = snd_pcm_playback_avail(runtime);
3171 switch (runtime->status->state) {
3172 case SNDRV_PCM_STATE_RUNNING:
3173 case SNDRV_PCM_STATE_PREPARED:
3174 case SNDRV_PCM_STATE_PAUSED:
3175 if (avail >= runtime->control->avail_min) {
3176 mask = POLLOUT | POLLWRNORM;
3177 break;
3178 }
3179 /* Fall through */
3180 case SNDRV_PCM_STATE_DRAINING:
3181 mask = 0;
3182 break;
3183 default:
3184 mask = POLLOUT | POLLWRNORM | POLLERR;
3185 break;
3186 }
3187 snd_pcm_stream_unlock_irq(substream);
3188 return mask;
3189}
3190
3191static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3192{
3193 struct snd_pcm_file *pcm_file;
3194 struct snd_pcm_substream *substream;
3195 struct snd_pcm_runtime *runtime;
3196 unsigned int mask;
3197 snd_pcm_uframes_t avail;
3198
3199 pcm_file = file->private_data;
3200
3201 substream = pcm_file->substream;
3202 if (PCM_RUNTIME_CHECK(substream))
3203 return -ENXIO;
3204 runtime = substream->runtime;
3205
3206 poll_wait(file, &runtime->sleep, wait);
3207
3208 snd_pcm_stream_lock_irq(substream);
3209 avail = snd_pcm_capture_avail(runtime);
3210 switch (runtime->status->state) {
3211 case SNDRV_PCM_STATE_RUNNING:
3212 case SNDRV_PCM_STATE_PREPARED:
3213 case SNDRV_PCM_STATE_PAUSED:
3214 if (avail >= runtime->control->avail_min) {
3215 mask = POLLIN | POLLRDNORM;
3216 break;
3217 }
3218 mask = 0;
3219 break;
3220 case SNDRV_PCM_STATE_DRAINING:
3221 if (avail > 0) {
3222 mask = POLLIN | POLLRDNORM;
3223 break;
3224 }
3225 /* Fall through */
3226 default:
3227 mask = POLLIN | POLLRDNORM | POLLERR;
3228 break;
3229 }
3230 snd_pcm_stream_unlock_irq(substream);
3231 return mask;
3232}
3233
3234/*
3235 * mmap support
3236 */
3237
3238/*
3239 * Only on coherent architectures, we can mmap the status and the control records
3240 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3241 */
3242#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3243/*
3244 * mmap status record
3245 */
3246static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3247 struct vm_fault *vmf)
3248{
3249 struct snd_pcm_substream *substream = area->vm_private_data;
3250 struct snd_pcm_runtime *runtime;
3251
3252 if (substream == NULL)
3253 return VM_FAULT_SIGBUS;
3254 runtime = substream->runtime;
3255 vmf->page = virt_to_page(runtime->status);
3256 get_page(vmf->page);
3257 return 0;
3258}
3259
3260static const struct vm_operations_struct snd_pcm_vm_ops_status =
3261{
3262 .fault = snd_pcm_mmap_status_fault,
3263};
3264
3265static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3266 struct vm_area_struct *area)
3267{
3268 long size;
3269 if (!(area->vm_flags & VM_READ))
3270 return -EINVAL;
3271 size = area->vm_end - area->vm_start;
3272 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3273 return -EINVAL;
3274 area->vm_ops = &snd_pcm_vm_ops_status;
3275 area->vm_private_data = substream;
3276 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3277 return 0;
3278}
3279
3280/*
3281 * mmap control record
3282 */
3283static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3284 struct vm_fault *vmf)
3285{
3286 struct snd_pcm_substream *substream = area->vm_private_data;
3287 struct snd_pcm_runtime *runtime;
3288
3289 if (substream == NULL)
3290 return VM_FAULT_SIGBUS;
3291 runtime = substream->runtime;
3292 vmf->page = virt_to_page(runtime->control);
3293 get_page(vmf->page);
3294 return 0;
3295}
3296
3297static const struct vm_operations_struct snd_pcm_vm_ops_control =
3298{
3299 .fault = snd_pcm_mmap_control_fault,
3300};
3301
3302static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3303 struct vm_area_struct *area)
3304{
3305 long size;
3306 if (!(area->vm_flags & VM_READ))
3307 return -EINVAL;
3308 size = area->vm_end - area->vm_start;
3309 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3310 return -EINVAL;
3311 area->vm_ops = &snd_pcm_vm_ops_control;
3312 area->vm_private_data = substream;
3313 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3314 return 0;
3315}
3316#else /* ! coherent mmap */
3317/*
3318 * don't support mmap for status and control records.
3319 */
3320static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3321 struct vm_area_struct *area)
3322{
3323 return -ENXIO;
3324}
3325static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3326 struct vm_area_struct *area)
3327{
3328 return -ENXIO;
3329}
3330#endif /* coherent mmap */
3331
3332static inline struct page *
3333snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3334{
3335 void *vaddr = substream->runtime->dma_area + ofs;
3336 return virt_to_page(vaddr);
3337}
3338
3339/*
3340 * fault callback for mmapping a RAM page
3341 */
3342static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3343 struct vm_fault *vmf)
3344{
3345 struct snd_pcm_substream *substream = area->vm_private_data;
3346 struct snd_pcm_runtime *runtime;
3347 unsigned long offset;
3348 struct page * page;
3349 size_t dma_bytes;
3350
3351 if (substream == NULL)
3352 return VM_FAULT_SIGBUS;
3353 runtime = substream->runtime;
3354 offset = vmf->pgoff << PAGE_SHIFT;
3355 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3356 if (offset > dma_bytes - PAGE_SIZE)
3357 return VM_FAULT_SIGBUS;
3358 if (substream->ops->page)
3359 page = substream->ops->page(substream, offset);
3360 else
3361 page = snd_pcm_default_page_ops(substream, offset);
3362 if (!page)
3363 return VM_FAULT_SIGBUS;
3364 get_page(page);
3365 vmf->page = page;
3366 return 0;
3367}
3368
3369static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3370 .open = snd_pcm_mmap_data_open,
3371 .close = snd_pcm_mmap_data_close,
3372};
3373
3374static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3375 .open = snd_pcm_mmap_data_open,
3376 .close = snd_pcm_mmap_data_close,
3377 .fault = snd_pcm_mmap_data_fault,
3378};
3379
3380/*
3381 * mmap the DMA buffer on RAM
3382 */
3383
3384/**
3385 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3386 * @substream: PCM substream
3387 * @area: VMA
3388 *
3389 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3390 * this function is invoked implicitly.
3391 */
3392int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3393 struct vm_area_struct *area)
3394{
3395 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3396#ifdef CONFIG_GENERIC_ALLOCATOR
3397 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3398 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3399 return remap_pfn_range(area, area->vm_start,
3400 substream->dma_buffer.addr >> PAGE_SHIFT,
3401 area->vm_end - area->vm_start, area->vm_page_prot);
3402 }
3403#endif /* CONFIG_GENERIC_ALLOCATOR */
3404#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3405 if (!substream->ops->page &&
3406 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3407 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3408 area,
3409 substream->runtime->dma_area,
3410 substream->runtime->dma_addr,
3411 area->vm_end - area->vm_start);
3412#endif /* CONFIG_X86 */
3413 /* mmap with fault handler */
3414 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3415 return 0;
3416}
3417EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3418
3419/*
3420 * mmap the DMA buffer on I/O memory area
3421 */
3422#if SNDRV_PCM_INFO_MMAP_IOMEM
3423/**
3424 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3425 * @substream: PCM substream
3426 * @area: VMA
3427 *
3428 * When your hardware uses the iomapped pages as the hardware buffer and
3429 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3430 * is supposed to work only on limited architectures.
3431 */
3432int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3433 struct vm_area_struct *area)
3434{
3435 struct snd_pcm_runtime *runtime = substream->runtime;;
3436
3437 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3438 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3439}
3440
3441EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3442#endif /* SNDRV_PCM_INFO_MMAP */
3443
3444/*
3445 * mmap DMA buffer
3446 */
3447int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3448 struct vm_area_struct *area)
3449{
3450 struct snd_pcm_runtime *runtime;
3451 long size;
3452 unsigned long offset;
3453 size_t dma_bytes;
3454 int err;
3455
3456 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3457 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3458 return -EINVAL;
3459 } else {
3460 if (!(area->vm_flags & VM_READ))
3461 return -EINVAL;
3462 }
3463 runtime = substream->runtime;
3464 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3465 return -EBADFD;
3466 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3467 return -ENXIO;
3468 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3469 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3470 return -EINVAL;
3471 size = area->vm_end - area->vm_start;
3472 offset = area->vm_pgoff << PAGE_SHIFT;
3473 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3474 if ((size_t)size > dma_bytes)
3475 return -EINVAL;
3476 if (offset > dma_bytes - size)
3477 return -EINVAL;
3478
3479 area->vm_ops = &snd_pcm_vm_ops_data;
3480 area->vm_private_data = substream;
3481 if (substream->ops->mmap)
3482 err = substream->ops->mmap(substream, area);
3483 else
3484 err = snd_pcm_lib_default_mmap(substream, area);
3485 if (!err)
3486 atomic_inc(&substream->mmap_count);
3487 return err;
3488}
3489
3490EXPORT_SYMBOL(snd_pcm_mmap_data);
3491
3492static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3493{
3494 struct snd_pcm_file * pcm_file;
3495 struct snd_pcm_substream *substream;
3496 unsigned long offset;
3497
3498 pcm_file = file->private_data;
3499 substream = pcm_file->substream;
3500 if (PCM_RUNTIME_CHECK(substream))
3501 return -ENXIO;
3502
3503 offset = area->vm_pgoff << PAGE_SHIFT;
3504 switch (offset) {
3505 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3506 if (pcm_file->no_compat_mmap)
3507 return -ENXIO;
3508 return snd_pcm_mmap_status(substream, file, area);
3509 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3510 if (pcm_file->no_compat_mmap)
3511 return -ENXIO;
3512 return snd_pcm_mmap_control(substream, file, area);
3513 default:
3514 return snd_pcm_mmap_data(substream, file, area);
3515 }
3516 return 0;
3517}
3518
3519static int snd_pcm_fasync(int fd, struct file * file, int on)
3520{
3521 struct snd_pcm_file * pcm_file;
3522 struct snd_pcm_substream *substream;
3523 struct snd_pcm_runtime *runtime;
3524
3525 pcm_file = file->private_data;
3526 substream = pcm_file->substream;
3527 if (PCM_RUNTIME_CHECK(substream))
3528 return -ENXIO;
3529 runtime = substream->runtime;
3530 return fasync_helper(fd, file, on, &runtime->fasync);
3531}
3532
3533/*
3534 * ioctl32 compat
3535 */
3536#ifdef CONFIG_COMPAT
3537#include "pcm_compat.c"
3538#else
3539#define snd_pcm_ioctl_compat NULL
3540#endif
3541
3542/*
3543 * To be removed helpers to keep binary compatibility
3544 */
3545
3546#ifdef CONFIG_SND_SUPPORT_OLD_API
3547#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3548#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3549
3550static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3551 struct snd_pcm_hw_params_old *oparams)
3552{
3553 unsigned int i;
3554
3555 memset(params, 0, sizeof(*params));
3556 params->flags = oparams->flags;
3557 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3558 params->masks[i].bits[0] = oparams->masks[i];
3559 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3560 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3561 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3562 params->info = oparams->info;
3563 params->msbits = oparams->msbits;
3564 params->rate_num = oparams->rate_num;
3565 params->rate_den = oparams->rate_den;
3566 params->fifo_size = oparams->fifo_size;
3567}
3568
3569static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3570 struct snd_pcm_hw_params *params)
3571{
3572 unsigned int i;
3573
3574 memset(oparams, 0, sizeof(*oparams));
3575 oparams->flags = params->flags;
3576 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3577 oparams->masks[i] = params->masks[i].bits[0];
3578 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3579 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3580 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3581 oparams->info = params->info;
3582 oparams->msbits = params->msbits;
3583 oparams->rate_num = params->rate_num;
3584 oparams->rate_den = params->rate_den;
3585 oparams->fifo_size = params->fifo_size;
3586}
3587
3588static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3589 struct snd_pcm_hw_params_old __user * _oparams)
3590{
3591 struct snd_pcm_hw_params *params;
3592 struct snd_pcm_hw_params_old *oparams = NULL;
3593 int err;
3594
3595 params = kmalloc(sizeof(*params), GFP_KERNEL);
3596 if (!params)
3597 return -ENOMEM;
3598
3599 oparams = memdup_user(_oparams, sizeof(*oparams));
3600 if (IS_ERR(oparams)) {
3601 err = PTR_ERR(oparams);
3602 goto out;
3603 }
3604 snd_pcm_hw_convert_from_old_params(params, oparams);
3605 err = snd_pcm_hw_refine(substream, params);
3606 snd_pcm_hw_convert_to_old_params(oparams, params);
3607 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3608 if (!err)
3609 err = -EFAULT;
3610 }
3611
3612 kfree(oparams);
3613out:
3614 kfree(params);
3615 return err;
3616}
3617
3618static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3619 struct snd_pcm_hw_params_old __user * _oparams)
3620{
3621 struct snd_pcm_hw_params *params;
3622 struct snd_pcm_hw_params_old *oparams = NULL;
3623 int err;
3624
3625 params = kmalloc(sizeof(*params), GFP_KERNEL);
3626 if (!params)
3627 return -ENOMEM;
3628
3629 oparams = memdup_user(_oparams, sizeof(*oparams));
3630 if (IS_ERR(oparams)) {
3631 err = PTR_ERR(oparams);
3632 goto out;
3633 }
3634 snd_pcm_hw_convert_from_old_params(params, oparams);
3635 err = snd_pcm_hw_params(substream, params);
3636 snd_pcm_hw_convert_to_old_params(oparams, params);
3637 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3638 if (!err)
3639 err = -EFAULT;
3640 }
3641
3642 kfree(oparams);
3643out:
3644 kfree(params);
3645 return err;
3646}
3647#endif /* CONFIG_SND_SUPPORT_OLD_API */
3648
3649#ifndef CONFIG_MMU
3650static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3651 unsigned long addr,
3652 unsigned long len,
3653 unsigned long pgoff,
3654 unsigned long flags)
3655{
3656 struct snd_pcm_file *pcm_file = file->private_data;
3657 struct snd_pcm_substream *substream = pcm_file->substream;
3658 struct snd_pcm_runtime *runtime = substream->runtime;
3659 unsigned long offset = pgoff << PAGE_SHIFT;
3660
3661 switch (offset) {
3662 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3663 return (unsigned long)runtime->status;
3664 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3665 return (unsigned long)runtime->control;
3666 default:
3667 return (unsigned long)runtime->dma_area + offset;
3668 }
3669}
3670#else
3671# define snd_pcm_get_unmapped_area NULL
3672#endif
3673
3674/*
3675 * Register section
3676 */
3677
3678const struct file_operations snd_pcm_f_ops[2] = {
3679 {
3680 .owner = THIS_MODULE,
3681 .write = snd_pcm_write,
3682 .write_iter = snd_pcm_writev,
3683 .open = snd_pcm_playback_open,
3684 .release = snd_pcm_release,
3685 .llseek = no_llseek,
3686 .poll = snd_pcm_playback_poll,
3687 .unlocked_ioctl = snd_pcm_playback_ioctl,
3688 .compat_ioctl = snd_pcm_ioctl_compat,
3689 .mmap = snd_pcm_mmap,
3690 .fasync = snd_pcm_fasync,
3691 .get_unmapped_area = snd_pcm_get_unmapped_area,
3692 },
3693 {
3694 .owner = THIS_MODULE,
3695 .read = snd_pcm_read,
3696 .read_iter = snd_pcm_readv,
3697 .open = snd_pcm_capture_open,
3698 .release = snd_pcm_release,
3699 .llseek = no_llseek,
3700 .poll = snd_pcm_capture_poll,
3701 .unlocked_ioctl = snd_pcm_capture_ioctl,
3702 .compat_ioctl = snd_pcm_ioctl_compat,
3703 .mmap = snd_pcm_mmap,
3704 .fasync = snd_pcm_fasync,
3705 .get_unmapped_area = snd_pcm_get_unmapped_area,
3706 }
3707};
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/aio.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 <asm/io.h>
38#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39#include <dma-coherence.h>
40#endif
41
42/*
43 * Compatibility
44 */
45
46struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60};
61
62#ifdef CONFIG_SND_SUPPORT_OLD_API
63#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70#endif
71static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73/*
74 *
75 */
76
77DEFINE_RWLOCK(snd_pcm_link_rwlock);
78EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82static inline mm_segment_t snd_enter_user(void)
83{
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87}
88
89static inline void snd_leave_user(mm_segment_t fs)
90{
91 set_fs(fs);
92}
93
94
95
96int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97{
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121}
122
123int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125{
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139}
140
141#undef RULES_DEBUG
142
143#ifdef RULES_DEBUG
144#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161};
162#endif
163
164int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166{
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192#ifdef RULES_DEBUG
193 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
194 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195#endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197#ifdef RULES_DEBUG
198 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199#endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212#ifdef RULES_DEBUG
213 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 pr_cont("empty");
216 else
217 pr_cont("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 pr_cont(" -> ");
221#endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223#ifdef RULES_DEBUG
224 if (i->empty)
225 pr_cont("empty\n");
226 else
227 pr_cont("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230#endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257#ifdef RULES_DEBUG
258 pr_debug("Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 pr_cont("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 pr_cont("empty");
268 else
269 pr_cont("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274#endif
275 changed = r->func(params, r);
276#ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 pr_cont(" -> ");
279 if (hw_is_mask(r->var))
280 pr_cont("%x", *m->bits);
281 else {
282 if (i->empty)
283 pr_cont("empty");
284 else
285 pr_cont("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 pr_cont("\n");
291#endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333}
334
335EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339{
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355}
356
357static int period_to_usecs(struct snd_pcm_runtime *runtime)
358{
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370}
371
372static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373{
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378}
379
380static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382{
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402#if IS_ENABLED(CONFIG_SND_PCM_OSS)
403 if (!substream->oss.oss)
404#endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479}
480
481static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483{
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499}
500
501static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502{
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526}
527
528static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530{
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->avail_min == 0)
547 return -EINVAL;
548 if (params->silence_size >= runtime->boundary) {
549 if (params->silence_threshold != 0)
550 return -EINVAL;
551 } else {
552 if (params->silence_size > params->silence_threshold)
553 return -EINVAL;
554 if (params->silence_threshold > runtime->buffer_size)
555 return -EINVAL;
556 }
557 err = 0;
558 snd_pcm_stream_lock_irq(substream);
559 runtime->tstamp_mode = params->tstamp_mode;
560 runtime->period_step = params->period_step;
561 runtime->control->avail_min = params->avail_min;
562 runtime->start_threshold = params->start_threshold;
563 runtime->stop_threshold = params->stop_threshold;
564 runtime->silence_threshold = params->silence_threshold;
565 runtime->silence_size = params->silence_size;
566 params->boundary = runtime->boundary;
567 if (snd_pcm_running(substream)) {
568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
569 runtime->silence_size > 0)
570 snd_pcm_playback_silence(substream, ULONG_MAX);
571 err = snd_pcm_update_state(substream, runtime);
572 }
573 snd_pcm_stream_unlock_irq(substream);
574 return err;
575}
576
577static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_sw_params __user * _params)
579{
580 struct snd_pcm_sw_params params;
581 int err;
582 if (copy_from_user(¶ms, _params, sizeof(params)))
583 return -EFAULT;
584 err = snd_pcm_sw_params(substream, ¶ms);
585 if (copy_to_user(_params, ¶ms, sizeof(params)))
586 return -EFAULT;
587 return err;
588}
589
590int snd_pcm_status(struct snd_pcm_substream *substream,
591 struct snd_pcm_status *status)
592{
593 struct snd_pcm_runtime *runtime = substream->runtime;
594
595 snd_pcm_stream_lock_irq(substream);
596 status->state = runtime->status->state;
597 status->suspended_state = runtime->status->suspended_state;
598 if (status->state == SNDRV_PCM_STATE_OPEN)
599 goto _end;
600 status->trigger_tstamp = runtime->trigger_tstamp;
601 if (snd_pcm_running(substream)) {
602 snd_pcm_update_hw_ptr(substream);
603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
604 status->tstamp = runtime->status->tstamp;
605 status->audio_tstamp =
606 runtime->status->audio_tstamp;
607 goto _tstamp_end;
608 }
609 }
610 snd_pcm_gettime(runtime, &status->tstamp);
611 _tstamp_end:
612 status->appl_ptr = runtime->control->appl_ptr;
613 status->hw_ptr = runtime->status->hw_ptr;
614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
615 status->avail = snd_pcm_playback_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
618 status->delay = runtime->buffer_size - status->avail;
619 status->delay += runtime->delay;
620 } else
621 status->delay = 0;
622 } else {
623 status->avail = snd_pcm_capture_avail(runtime);
624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
625 status->delay = status->avail + runtime->delay;
626 else
627 status->delay = 0;
628 }
629 status->avail_max = runtime->avail_max;
630 status->overrange = runtime->overrange;
631 runtime->avail_max = 0;
632 runtime->overrange = 0;
633 _end:
634 snd_pcm_stream_unlock_irq(substream);
635 return 0;
636}
637
638static int snd_pcm_status_user(struct snd_pcm_substream *substream,
639 struct snd_pcm_status __user * _status)
640{
641 struct snd_pcm_status status;
642 int res;
643
644 memset(&status, 0, sizeof(status));
645 res = snd_pcm_status(substream, &status);
646 if (res < 0)
647 return res;
648 if (copy_to_user(_status, &status, sizeof(status)))
649 return -EFAULT;
650 return 0;
651}
652
653static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
654 struct snd_pcm_channel_info * info)
655{
656 struct snd_pcm_runtime *runtime;
657 unsigned int channel;
658
659 channel = info->channel;
660 runtime = substream->runtime;
661 snd_pcm_stream_lock_irq(substream);
662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
663 snd_pcm_stream_unlock_irq(substream);
664 return -EBADFD;
665 }
666 snd_pcm_stream_unlock_irq(substream);
667 if (channel >= runtime->channels)
668 return -EINVAL;
669 memset(info, 0, sizeof(*info));
670 info->channel = channel;
671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
672}
673
674static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
675 struct snd_pcm_channel_info __user * _info)
676{
677 struct snd_pcm_channel_info info;
678 int res;
679
680 if (copy_from_user(&info, _info, sizeof(info)))
681 return -EFAULT;
682 res = snd_pcm_channel_info(substream, &info);
683 if (res < 0)
684 return res;
685 if (copy_to_user(_info, &info, sizeof(info)))
686 return -EFAULT;
687 return 0;
688}
689
690static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
691{
692 struct snd_pcm_runtime *runtime = substream->runtime;
693 if (runtime->trigger_master == NULL)
694 return;
695 if (runtime->trigger_master == substream) {
696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
697 } else {
698 snd_pcm_trigger_tstamp(runtime->trigger_master);
699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
700 }
701 runtime->trigger_master = NULL;
702}
703
704struct action_ops {
705 int (*pre_action)(struct snd_pcm_substream *substream, int state);
706 int (*do_action)(struct snd_pcm_substream *substream, int state);
707 void (*undo_action)(struct snd_pcm_substream *substream, int state);
708 void (*post_action)(struct snd_pcm_substream *substream, int state);
709};
710
711/*
712 * this functions is core for handling of linked stream
713 * Note: the stream state might be changed also on failure
714 * Note2: call with calling stream lock + link lock
715 */
716static int snd_pcm_action_group(struct action_ops *ops,
717 struct snd_pcm_substream *substream,
718 int state, int do_lock)
719{
720 struct snd_pcm_substream *s = NULL;
721 struct snd_pcm_substream *s1;
722 int res = 0;
723
724 snd_pcm_group_for_each_entry(s, substream) {
725 if (do_lock && s != substream)
726 spin_lock_nested(&s->self_group.lock,
727 SINGLE_DEPTH_NESTING);
728 res = ops->pre_action(s, state);
729 if (res < 0)
730 goto _unlock;
731 }
732 snd_pcm_group_for_each_entry(s, substream) {
733 res = ops->do_action(s, state);
734 if (res < 0) {
735 if (ops->undo_action) {
736 snd_pcm_group_for_each_entry(s1, substream) {
737 if (s1 == s) /* failed stream */
738 break;
739 ops->undo_action(s1, state);
740 }
741 }
742 s = NULL; /* unlock all */
743 goto _unlock;
744 }
745 }
746 snd_pcm_group_for_each_entry(s, substream) {
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each_entry(s1, substream) {
753 if (s1 != substream)
754 spin_unlock(&s1->self_group.lock);
755 if (s1 == s) /* end */
756 break;
757 }
758 }
759 return res;
760}
761
762/*
763 * Note: call with stream lock
764 */
765static int snd_pcm_action_single(struct action_ops *ops,
766 struct snd_pcm_substream *substream,
767 int state)
768{
769 int res;
770
771 res = ops->pre_action(substream, state);
772 if (res < 0)
773 return res;
774 res = ops->do_action(substream, state);
775 if (res == 0)
776 ops->post_action(substream, state);
777 else if (ops->undo_action)
778 ops->undo_action(substream, state);
779 return res;
780}
781
782/*
783 * Note: call with stream lock
784 */
785static int snd_pcm_action(struct action_ops *ops,
786 struct snd_pcm_substream *substream,
787 int state)
788{
789 int res;
790
791 if (snd_pcm_stream_linked(substream)) {
792 if (!spin_trylock(&substream->group->lock)) {
793 spin_unlock(&substream->self_group.lock);
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 }
797 res = snd_pcm_action_group(ops, substream, state, 1);
798 spin_unlock(&substream->group->lock);
799 } else {
800 res = snd_pcm_action_single(ops, substream, state);
801 }
802 return res;
803}
804
805/*
806 * Note: don't use any locks before
807 */
808static int snd_pcm_action_lock_irq(struct action_ops *ops,
809 struct snd_pcm_substream *substream,
810 int state)
811{
812 int res;
813
814 read_lock_irq(&snd_pcm_link_rwlock);
815 if (snd_pcm_stream_linked(substream)) {
816 spin_lock(&substream->group->lock);
817 spin_lock(&substream->self_group.lock);
818 res = snd_pcm_action_group(ops, substream, state, 1);
819 spin_unlock(&substream->self_group.lock);
820 spin_unlock(&substream->group->lock);
821 } else {
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_single(ops, substream, state);
824 spin_unlock(&substream->self_group.lock);
825 }
826 read_unlock_irq(&snd_pcm_link_rwlock);
827 return res;
828}
829
830/*
831 */
832static int snd_pcm_action_nonatomic(struct action_ops *ops,
833 struct snd_pcm_substream *substream,
834 int state)
835{
836 int res;
837
838 down_read(&snd_pcm_link_rwsem);
839 if (snd_pcm_stream_linked(substream))
840 res = snd_pcm_action_group(ops, substream, state, 0);
841 else
842 res = snd_pcm_action_single(ops, substream, state);
843 up_read(&snd_pcm_link_rwsem);
844 return res;
845}
846
847/*
848 * start callbacks
849 */
850static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
851{
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
854 return -EBADFD;
855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
856 !snd_pcm_playback_data(substream))
857 return -EPIPE;
858 runtime->trigger_master = substream;
859 return 0;
860}
861
862static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
863{
864 if (substream->runtime->trigger_master != substream)
865 return 0;
866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
867}
868
869static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
870{
871 if (substream->runtime->trigger_master == substream)
872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
873}
874
875static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
876{
877 struct snd_pcm_runtime *runtime = substream->runtime;
878 snd_pcm_trigger_tstamp(substream);
879 runtime->hw_ptr_jiffies = jiffies;
880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
881 runtime->rate;
882 runtime->status->state = state;
883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
884 runtime->silence_size > 0)
885 snd_pcm_playback_silence(substream, ULONG_MAX);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889}
890
891static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896};
897
898/**
899 * snd_pcm_start - start all linked streams
900 * @substream: the PCM substream instance
901 *
902 * Return: Zero if successful, or a negative error code.
903 */
904int snd_pcm_start(struct snd_pcm_substream *substream)
905{
906 return snd_pcm_action(&snd_pcm_action_start, substream,
907 SNDRV_PCM_STATE_RUNNING);
908}
909
910/*
911 * stop callbacks
912 */
913static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
914{
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
917 return -EBADFD;
918 runtime->trigger_master = substream;
919 return 0;
920}
921
922static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
923{
924 if (substream->runtime->trigger_master == substream &&
925 snd_pcm_running(substream))
926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
927 return 0; /* unconditonally stop all substreams */
928}
929
930static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
931{
932 struct snd_pcm_runtime *runtime = substream->runtime;
933 if (runtime->status->state != state) {
934 snd_pcm_trigger_tstamp(substream);
935 if (substream->timer)
936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
937 &runtime->trigger_tstamp);
938 runtime->status->state = state;
939 }
940 wake_up(&runtime->sleep);
941 wake_up(&runtime->tsleep);
942}
943
944static struct action_ops snd_pcm_action_stop = {
945 .pre_action = snd_pcm_pre_stop,
946 .do_action = snd_pcm_do_stop,
947 .post_action = snd_pcm_post_stop
948};
949
950/**
951 * snd_pcm_stop - try to stop all running streams in the substream group
952 * @substream: the PCM substream instance
953 * @state: PCM state after stopping the stream
954 *
955 * The state of each stream is then changed to the given state unconditionally.
956 *
957 * Return: Zero if successful, or a negative error code.
958 */
959int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
960{
961 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
962}
963
964EXPORT_SYMBOL(snd_pcm_stop);
965
966/**
967 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
968 * @substream: the PCM substream
969 *
970 * After stopping, the state is changed to SETUP.
971 * Unlike snd_pcm_stop(), this affects only the given stream.
972 *
973 * Return: Zero if succesful, or a negative error code.
974 */
975int snd_pcm_drain_done(struct snd_pcm_substream *substream)
976{
977 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
978 SNDRV_PCM_STATE_SETUP);
979}
980
981/*
982 * pause callbacks
983 */
984static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
985{
986 struct snd_pcm_runtime *runtime = substream->runtime;
987 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
988 return -ENOSYS;
989 if (push) {
990 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
991 return -EBADFD;
992 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
993 return -EBADFD;
994 runtime->trigger_master = substream;
995 return 0;
996}
997
998static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
999{
1000 if (substream->runtime->trigger_master != substream)
1001 return 0;
1002 /* some drivers might use hw_ptr to recover from the pause -
1003 update the hw_ptr now */
1004 if (push)
1005 snd_pcm_update_hw_ptr(substream);
1006 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1007 * a delta between the current jiffies, this gives a large enough
1008 * delta, effectively to skip the check once.
1009 */
1010 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1011 return substream->ops->trigger(substream,
1012 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1013 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1014}
1015
1016static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1017{
1018 if (substream->runtime->trigger_master == substream)
1019 substream->ops->trigger(substream,
1020 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1021 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1022}
1023
1024static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1025{
1026 struct snd_pcm_runtime *runtime = substream->runtime;
1027 snd_pcm_trigger_tstamp(substream);
1028 if (push) {
1029 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1030 if (substream->timer)
1031 snd_timer_notify(substream->timer,
1032 SNDRV_TIMER_EVENT_MPAUSE,
1033 &runtime->trigger_tstamp);
1034 wake_up(&runtime->sleep);
1035 wake_up(&runtime->tsleep);
1036 } else {
1037 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1038 if (substream->timer)
1039 snd_timer_notify(substream->timer,
1040 SNDRV_TIMER_EVENT_MCONTINUE,
1041 &runtime->trigger_tstamp);
1042 }
1043}
1044
1045static struct action_ops snd_pcm_action_pause = {
1046 .pre_action = snd_pcm_pre_pause,
1047 .do_action = snd_pcm_do_pause,
1048 .undo_action = snd_pcm_undo_pause,
1049 .post_action = snd_pcm_post_pause
1050};
1051
1052/*
1053 * Push/release the pause for all linked streams.
1054 */
1055static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1056{
1057 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1058}
1059
1060#ifdef CONFIG_PM
1061/* suspend */
1062
1063static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1064{
1065 struct snd_pcm_runtime *runtime = substream->runtime;
1066 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1067 return -EBUSY;
1068 runtime->trigger_master = substream;
1069 return 0;
1070}
1071
1072static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1073{
1074 struct snd_pcm_runtime *runtime = substream->runtime;
1075 if (runtime->trigger_master != substream)
1076 return 0;
1077 if (! snd_pcm_running(substream))
1078 return 0;
1079 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1080 return 0; /* suspend unconditionally */
1081}
1082
1083static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1084{
1085 struct snd_pcm_runtime *runtime = substream->runtime;
1086 snd_pcm_trigger_tstamp(substream);
1087 if (substream->timer)
1088 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1089 &runtime->trigger_tstamp);
1090 runtime->status->suspended_state = runtime->status->state;
1091 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1092 wake_up(&runtime->sleep);
1093 wake_up(&runtime->tsleep);
1094}
1095
1096static struct action_ops snd_pcm_action_suspend = {
1097 .pre_action = snd_pcm_pre_suspend,
1098 .do_action = snd_pcm_do_suspend,
1099 .post_action = snd_pcm_post_suspend
1100};
1101
1102/**
1103 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1104 * @substream: the PCM substream
1105 *
1106 * After this call, all streams are changed to SUSPENDED state.
1107 *
1108 * Return: Zero if successful (or @substream is %NULL), or a negative error
1109 * code.
1110 */
1111int snd_pcm_suspend(struct snd_pcm_substream *substream)
1112{
1113 int err;
1114 unsigned long flags;
1115
1116 if (! substream)
1117 return 0;
1118
1119 snd_pcm_stream_lock_irqsave(substream, flags);
1120 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1121 snd_pcm_stream_unlock_irqrestore(substream, flags);
1122 return err;
1123}
1124
1125EXPORT_SYMBOL(snd_pcm_suspend);
1126
1127/**
1128 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1129 * @pcm: the PCM instance
1130 *
1131 * After this call, all streams are changed to SUSPENDED state.
1132 *
1133 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1134 */
1135int snd_pcm_suspend_all(struct snd_pcm *pcm)
1136{
1137 struct snd_pcm_substream *substream;
1138 int stream, err = 0;
1139
1140 if (! pcm)
1141 return 0;
1142
1143 for (stream = 0; stream < 2; stream++) {
1144 for (substream = pcm->streams[stream].substream;
1145 substream; substream = substream->next) {
1146 /* FIXME: the open/close code should lock this as well */
1147 if (substream->runtime == NULL)
1148 continue;
1149 err = snd_pcm_suspend(substream);
1150 if (err < 0 && err != -EBUSY)
1151 return err;
1152 }
1153 }
1154 return 0;
1155}
1156
1157EXPORT_SYMBOL(snd_pcm_suspend_all);
1158
1159/* resume */
1160
1161static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1162{
1163 struct snd_pcm_runtime *runtime = substream->runtime;
1164 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1165 return -ENOSYS;
1166 runtime->trigger_master = substream;
1167 return 0;
1168}
1169
1170static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1171{
1172 struct snd_pcm_runtime *runtime = substream->runtime;
1173 if (runtime->trigger_master != substream)
1174 return 0;
1175 /* DMA not running previously? */
1176 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1177 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1178 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1179 return 0;
1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1181}
1182
1183static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1184{
1185 if (substream->runtime->trigger_master == substream &&
1186 snd_pcm_running(substream))
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1188}
1189
1190static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1191{
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 if (substream->timer)
1195 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1196 &runtime->trigger_tstamp);
1197 runtime->status->state = runtime->status->suspended_state;
1198}
1199
1200static struct action_ops snd_pcm_action_resume = {
1201 .pre_action = snd_pcm_pre_resume,
1202 .do_action = snd_pcm_do_resume,
1203 .undo_action = snd_pcm_undo_resume,
1204 .post_action = snd_pcm_post_resume
1205};
1206
1207static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208{
1209 struct snd_card *card = substream->pcm->card;
1210 int res;
1211
1212 snd_power_lock(card);
1213 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1214 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1215 snd_power_unlock(card);
1216 return res;
1217}
1218
1219#else
1220
1221static int snd_pcm_resume(struct snd_pcm_substream *substream)
1222{
1223 return -ENOSYS;
1224}
1225
1226#endif /* CONFIG_PM */
1227
1228/*
1229 * xrun ioctl
1230 *
1231 * Change the RUNNING stream(s) to XRUN state.
1232 */
1233static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1234{
1235 struct snd_card *card = substream->pcm->card;
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 int result;
1238
1239 snd_power_lock(card);
1240 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1241 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1242 if (result < 0)
1243 goto _unlock;
1244 }
1245
1246 snd_pcm_stream_lock_irq(substream);
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_XRUN:
1249 result = 0; /* already there */
1250 break;
1251 case SNDRV_PCM_STATE_RUNNING:
1252 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1253 break;
1254 default:
1255 result = -EBADFD;
1256 }
1257 snd_pcm_stream_unlock_irq(substream);
1258 _unlock:
1259 snd_power_unlock(card);
1260 return result;
1261}
1262
1263/*
1264 * reset ioctl
1265 */
1266static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1267{
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 switch (runtime->status->state) {
1270 case SNDRV_PCM_STATE_RUNNING:
1271 case SNDRV_PCM_STATE_PREPARED:
1272 case SNDRV_PCM_STATE_PAUSED:
1273 case SNDRV_PCM_STATE_SUSPENDED:
1274 return 0;
1275 default:
1276 return -EBADFD;
1277 }
1278}
1279
1280static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1281{
1282 struct snd_pcm_runtime *runtime = substream->runtime;
1283 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1284 if (err < 0)
1285 return err;
1286 runtime->hw_ptr_base = 0;
1287 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1288 runtime->status->hw_ptr % runtime->period_size;
1289 runtime->silence_start = runtime->status->hw_ptr;
1290 runtime->silence_filled = 0;
1291 return 0;
1292}
1293
1294static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1295{
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 runtime->control->appl_ptr = runtime->status->hw_ptr;
1298 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1299 runtime->silence_size > 0)
1300 snd_pcm_playback_silence(substream, ULONG_MAX);
1301}
1302
1303static struct action_ops snd_pcm_action_reset = {
1304 .pre_action = snd_pcm_pre_reset,
1305 .do_action = snd_pcm_do_reset,
1306 .post_action = snd_pcm_post_reset
1307};
1308
1309static int snd_pcm_reset(struct snd_pcm_substream *substream)
1310{
1311 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1312}
1313
1314/*
1315 * prepare ioctl
1316 */
1317/* we use the second argument for updating f_flags */
1318static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1319 int f_flags)
1320{
1321 struct snd_pcm_runtime *runtime = substream->runtime;
1322 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1323 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1324 return -EBADFD;
1325 if (snd_pcm_running(substream))
1326 return -EBUSY;
1327 substream->f_flags = f_flags;
1328 return 0;
1329}
1330
1331static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1332{
1333 int err;
1334 err = substream->ops->prepare(substream);
1335 if (err < 0)
1336 return err;
1337 return snd_pcm_do_reset(substream, 0);
1338}
1339
1340static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1341{
1342 struct snd_pcm_runtime *runtime = substream->runtime;
1343 runtime->control->appl_ptr = runtime->status->hw_ptr;
1344 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1345}
1346
1347static struct action_ops snd_pcm_action_prepare = {
1348 .pre_action = snd_pcm_pre_prepare,
1349 .do_action = snd_pcm_do_prepare,
1350 .post_action = snd_pcm_post_prepare
1351};
1352
1353/**
1354 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1355 * @substream: the PCM substream instance
1356 * @file: file to refer f_flags
1357 *
1358 * Return: Zero if successful, or a negative error code.
1359 */
1360static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1361 struct file *file)
1362{
1363 int res;
1364 struct snd_card *card = substream->pcm->card;
1365 int f_flags;
1366
1367 if (file)
1368 f_flags = file->f_flags;
1369 else
1370 f_flags = substream->f_flags;
1371
1372 snd_power_lock(card);
1373 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1374 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1375 substream, f_flags);
1376 snd_power_unlock(card);
1377 return res;
1378}
1379
1380/*
1381 * drain ioctl
1382 */
1383
1384static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1385{
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 switch (runtime->status->state) {
1388 case SNDRV_PCM_STATE_OPEN:
1389 case SNDRV_PCM_STATE_DISCONNECTED:
1390 case SNDRV_PCM_STATE_SUSPENDED:
1391 return -EBADFD;
1392 }
1393 runtime->trigger_master = substream;
1394 return 0;
1395}
1396
1397static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1398{
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1401 switch (runtime->status->state) {
1402 case SNDRV_PCM_STATE_PREPARED:
1403 /* start playback stream if possible */
1404 if (! snd_pcm_playback_empty(substream)) {
1405 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1406 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1407 }
1408 break;
1409 case SNDRV_PCM_STATE_RUNNING:
1410 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1411 break;
1412 case SNDRV_PCM_STATE_XRUN:
1413 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1414 break;
1415 default:
1416 break;
1417 }
1418 } else {
1419 /* stop running stream */
1420 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1421 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1422 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1423 snd_pcm_do_stop(substream, new_state);
1424 snd_pcm_post_stop(substream, new_state);
1425 }
1426 }
1427 return 0;
1428}
1429
1430static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1431{
1432}
1433
1434static struct action_ops snd_pcm_action_drain_init = {
1435 .pre_action = snd_pcm_pre_drain_init,
1436 .do_action = snd_pcm_do_drain_init,
1437 .post_action = snd_pcm_post_drain_init
1438};
1439
1440static int snd_pcm_drop(struct snd_pcm_substream *substream);
1441
1442/*
1443 * Drain the stream(s).
1444 * When the substream is linked, sync until the draining of all playback streams
1445 * is finished.
1446 * After this call, all streams are supposed to be either SETUP or DRAINING
1447 * (capture only) state.
1448 */
1449static int snd_pcm_drain(struct snd_pcm_substream *substream,
1450 struct file *file)
1451{
1452 struct snd_card *card;
1453 struct snd_pcm_runtime *runtime;
1454 struct snd_pcm_substream *s;
1455 wait_queue_t wait;
1456 int result = 0;
1457 int nonblock = 0;
1458
1459 card = substream->pcm->card;
1460 runtime = substream->runtime;
1461
1462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1463 return -EBADFD;
1464
1465 snd_power_lock(card);
1466 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1467 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1468 if (result < 0) {
1469 snd_power_unlock(card);
1470 return result;
1471 }
1472 }
1473
1474 if (file) {
1475 if (file->f_flags & O_NONBLOCK)
1476 nonblock = 1;
1477 } else if (substream->f_flags & O_NONBLOCK)
1478 nonblock = 1;
1479
1480 down_read(&snd_pcm_link_rwsem);
1481 snd_pcm_stream_lock_irq(substream);
1482 /* resume pause */
1483 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1484 snd_pcm_pause(substream, 0);
1485
1486 /* pre-start/stop - all running streams are changed to DRAINING state */
1487 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1488 if (result < 0)
1489 goto unlock;
1490 /* in non-blocking, we don't wait in ioctl but let caller poll */
1491 if (nonblock) {
1492 result = -EAGAIN;
1493 goto unlock;
1494 }
1495
1496 for (;;) {
1497 long tout;
1498 struct snd_pcm_runtime *to_check;
1499 if (signal_pending(current)) {
1500 result = -ERESTARTSYS;
1501 break;
1502 }
1503 /* find a substream to drain */
1504 to_check = NULL;
1505 snd_pcm_group_for_each_entry(s, substream) {
1506 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1507 continue;
1508 runtime = s->runtime;
1509 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1510 to_check = runtime;
1511 break;
1512 }
1513 }
1514 if (!to_check)
1515 break; /* all drained */
1516 init_waitqueue_entry(&wait, current);
1517 add_wait_queue(&to_check->sleep, &wait);
1518 snd_pcm_stream_unlock_irq(substream);
1519 up_read(&snd_pcm_link_rwsem);
1520 snd_power_unlock(card);
1521 if (runtime->no_period_wakeup)
1522 tout = MAX_SCHEDULE_TIMEOUT;
1523 else {
1524 tout = 10;
1525 if (runtime->rate) {
1526 long t = runtime->period_size * 2 / runtime->rate;
1527 tout = max(t, tout);
1528 }
1529 tout = msecs_to_jiffies(tout * 1000);
1530 }
1531 tout = schedule_timeout_interruptible(tout);
1532 snd_power_lock(card);
1533 down_read(&snd_pcm_link_rwsem);
1534 snd_pcm_stream_lock_irq(substream);
1535 remove_wait_queue(&to_check->sleep, &wait);
1536 if (card->shutdown) {
1537 result = -ENODEV;
1538 break;
1539 }
1540 if (tout == 0) {
1541 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1542 result = -ESTRPIPE;
1543 else {
1544 dev_dbg(substream->pcm->card->dev,
1545 "playback drain error (DMA or IRQ trouble?)\n");
1546 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547 result = -EIO;
1548 }
1549 break;
1550 }
1551 }
1552
1553 unlock:
1554 snd_pcm_stream_unlock_irq(substream);
1555 up_read(&snd_pcm_link_rwsem);
1556 snd_power_unlock(card);
1557
1558 return result;
1559}
1560
1561/*
1562 * drop ioctl
1563 *
1564 * Immediately put all linked substreams into SETUP state.
1565 */
1566static int snd_pcm_drop(struct snd_pcm_substream *substream)
1567{
1568 struct snd_pcm_runtime *runtime;
1569 int result = 0;
1570
1571 if (PCM_RUNTIME_CHECK(substream))
1572 return -ENXIO;
1573 runtime = substream->runtime;
1574
1575 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1576 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1577 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1578 return -EBADFD;
1579
1580 snd_pcm_stream_lock_irq(substream);
1581 /* resume pause */
1582 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1583 snd_pcm_pause(substream, 0);
1584
1585 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1586 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1587 snd_pcm_stream_unlock_irq(substream);
1588
1589 return result;
1590}
1591
1592
1593static bool is_pcm_file(struct file *file)
1594{
1595 struct inode *inode = file_inode(file);
1596 unsigned int minor;
1597
1598 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1599 return false;
1600 minor = iminor(inode);
1601 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1602 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1603}
1604
1605/*
1606 * PCM link handling
1607 */
1608static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1609{
1610 int res = 0;
1611 struct snd_pcm_file *pcm_file;
1612 struct snd_pcm_substream *substream1;
1613 struct snd_pcm_group *group;
1614 struct fd f = fdget(fd);
1615
1616 if (!f.file)
1617 return -EBADFD;
1618 if (!is_pcm_file(f.file)) {
1619 res = -EBADFD;
1620 goto _badf;
1621 }
1622 pcm_file = f.file->private_data;
1623 substream1 = pcm_file->substream;
1624 group = kmalloc(sizeof(*group), GFP_KERNEL);
1625 if (!group) {
1626 res = -ENOMEM;
1627 goto _nolock;
1628 }
1629 down_write(&snd_pcm_link_rwsem);
1630 write_lock_irq(&snd_pcm_link_rwlock);
1631 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1632 substream->runtime->status->state != substream1->runtime->status->state) {
1633 res = -EBADFD;
1634 goto _end;
1635 }
1636 if (snd_pcm_stream_linked(substream1)) {
1637 res = -EALREADY;
1638 goto _end;
1639 }
1640 if (!snd_pcm_stream_linked(substream)) {
1641 substream->group = group;
1642 group = NULL;
1643 spin_lock_init(&substream->group->lock);
1644 INIT_LIST_HEAD(&substream->group->substreams);
1645 list_add_tail(&substream->link_list, &substream->group->substreams);
1646 substream->group->count = 1;
1647 }
1648 list_add_tail(&substream1->link_list, &substream->group->substreams);
1649 substream->group->count++;
1650 substream1->group = substream->group;
1651 _end:
1652 write_unlock_irq(&snd_pcm_link_rwlock);
1653 up_write(&snd_pcm_link_rwsem);
1654 _nolock:
1655 snd_card_unref(substream1->pcm->card);
1656 kfree(group);
1657 _badf:
1658 fdput(f);
1659 return res;
1660}
1661
1662static void relink_to_local(struct snd_pcm_substream *substream)
1663{
1664 substream->group = &substream->self_group;
1665 INIT_LIST_HEAD(&substream->self_group.substreams);
1666 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1667}
1668
1669static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1670{
1671 struct snd_pcm_substream *s;
1672 int res = 0;
1673
1674 down_write(&snd_pcm_link_rwsem);
1675 write_lock_irq(&snd_pcm_link_rwlock);
1676 if (!snd_pcm_stream_linked(substream)) {
1677 res = -EALREADY;
1678 goto _end;
1679 }
1680 list_del(&substream->link_list);
1681 substream->group->count--;
1682 if (substream->group->count == 1) { /* detach the last stream, too */
1683 snd_pcm_group_for_each_entry(s, substream) {
1684 relink_to_local(s);
1685 break;
1686 }
1687 kfree(substream->group);
1688 }
1689 relink_to_local(substream);
1690 _end:
1691 write_unlock_irq(&snd_pcm_link_rwlock);
1692 up_write(&snd_pcm_link_rwsem);
1693 return res;
1694}
1695
1696/*
1697 * hw configurator
1698 */
1699static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1700 struct snd_pcm_hw_rule *rule)
1701{
1702 struct snd_interval t;
1703 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1704 hw_param_interval_c(params, rule->deps[1]), &t);
1705 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1706}
1707
1708static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1709 struct snd_pcm_hw_rule *rule)
1710{
1711 struct snd_interval t;
1712 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1713 hw_param_interval_c(params, rule->deps[1]), &t);
1714 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715}
1716
1717static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1718 struct snd_pcm_hw_rule *rule)
1719{
1720 struct snd_interval t;
1721 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1722 hw_param_interval_c(params, rule->deps[1]),
1723 (unsigned long) rule->private, &t);
1724 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1725}
1726
1727static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1728 struct snd_pcm_hw_rule *rule)
1729{
1730 struct snd_interval t;
1731 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1732 (unsigned long) rule->private,
1733 hw_param_interval_c(params, rule->deps[1]), &t);
1734 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1735}
1736
1737static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1738 struct snd_pcm_hw_rule *rule)
1739{
1740 unsigned int k;
1741 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1742 struct snd_mask m;
1743 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1744 snd_mask_any(&m);
1745 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1746 int bits;
1747 if (! snd_mask_test(mask, k))
1748 continue;
1749 bits = snd_pcm_format_physical_width(k);
1750 if (bits <= 0)
1751 continue; /* ignore invalid formats */
1752 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1753 snd_mask_reset(&m, k);
1754 }
1755 return snd_mask_refine(mask, &m);
1756}
1757
1758static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1759 struct snd_pcm_hw_rule *rule)
1760{
1761 struct snd_interval t;
1762 unsigned int k;
1763 t.min = UINT_MAX;
1764 t.max = 0;
1765 t.openmin = 0;
1766 t.openmax = 0;
1767 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1768 int bits;
1769 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1770 continue;
1771 bits = snd_pcm_format_physical_width(k);
1772 if (bits <= 0)
1773 continue; /* ignore invalid formats */
1774 if (t.min > (unsigned)bits)
1775 t.min = bits;
1776 if (t.max < (unsigned)bits)
1777 t.max = bits;
1778 }
1779 t.integer = 1;
1780 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1781}
1782
1783#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1784#error "Change this table"
1785#endif
1786
1787static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1788 48000, 64000, 88200, 96000, 176400, 192000 };
1789
1790const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1791 .count = ARRAY_SIZE(rates),
1792 .list = rates,
1793};
1794
1795static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1796 struct snd_pcm_hw_rule *rule)
1797{
1798 struct snd_pcm_hardware *hw = rule->private;
1799 return snd_interval_list(hw_param_interval(params, rule->var),
1800 snd_pcm_known_rates.count,
1801 snd_pcm_known_rates.list, hw->rates);
1802}
1803
1804static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1805 struct snd_pcm_hw_rule *rule)
1806{
1807 struct snd_interval t;
1808 struct snd_pcm_substream *substream = rule->private;
1809 t.min = 0;
1810 t.max = substream->buffer_bytes_max;
1811 t.openmin = 0;
1812 t.openmax = 0;
1813 t.integer = 1;
1814 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1815}
1816
1817int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1818{
1819 struct snd_pcm_runtime *runtime = substream->runtime;
1820 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1821 int k, err;
1822
1823 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1824 snd_mask_any(constrs_mask(constrs, k));
1825 }
1826
1827 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1828 snd_interval_any(constrs_interval(constrs, k));
1829 }
1830
1831 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1832 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1833 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1834 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1835 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1836
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1838 snd_pcm_hw_rule_format, NULL,
1839 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1843 snd_pcm_hw_rule_sample_bits, NULL,
1844 SNDRV_PCM_HW_PARAM_FORMAT,
1845 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1846 if (err < 0)
1847 return err;
1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1849 snd_pcm_hw_rule_div, NULL,
1850 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1854 snd_pcm_hw_rule_mul, NULL,
1855 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856 if (err < 0)
1857 return err;
1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1860 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1861 if (err < 0)
1862 return err;
1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1866 if (err < 0)
1867 return err;
1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1869 snd_pcm_hw_rule_div, NULL,
1870 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1871 if (err < 0)
1872 return err;
1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1874 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1875 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1876 if (err < 0)
1877 return err;
1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1881 if (err < 0)
1882 return err;
1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1884 snd_pcm_hw_rule_div, NULL,
1885 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1886 if (err < 0)
1887 return err;
1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1889 snd_pcm_hw_rule_div, NULL,
1890 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1891 if (err < 0)
1892 return err;
1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1895 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896 if (err < 0)
1897 return err;
1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1900 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1901 if (err < 0)
1902 return err;
1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1904 snd_pcm_hw_rule_mul, NULL,
1905 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1906 if (err < 0)
1907 return err;
1908 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1910 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1911 if (err < 0)
1912 return err;
1913 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1915 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1916 if (err < 0)
1917 return err;
1918 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1919 snd_pcm_hw_rule_muldivk, (void*) 8,
1920 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1921 if (err < 0)
1922 return err;
1923 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1924 snd_pcm_hw_rule_muldivk, (void*) 8,
1925 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926 if (err < 0)
1927 return err;
1928 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1929 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1930 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1931 if (err < 0)
1932 return err;
1933 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1934 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936 if (err < 0)
1937 return err;
1938 return 0;
1939}
1940
1941int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1942{
1943 struct snd_pcm_runtime *runtime = substream->runtime;
1944 struct snd_pcm_hardware *hw = &runtime->hw;
1945 int err;
1946 unsigned int mask = 0;
1947
1948 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1949 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1950 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1951 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1952 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1953 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1955 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1957 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1958 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1959 }
1960 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1961 if (err < 0)
1962 return err;
1963
1964 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1965 if (err < 0)
1966 return err;
1967
1968 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1969 if (err < 0)
1970 return err;
1971
1972 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1973 hw->channels_min, hw->channels_max);
1974 if (err < 0)
1975 return err;
1976
1977 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1978 hw->rate_min, hw->rate_max);
1979 if (err < 0)
1980 return err;
1981
1982 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1983 hw->period_bytes_min, hw->period_bytes_max);
1984 if (err < 0)
1985 return err;
1986
1987 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1988 hw->periods_min, hw->periods_max);
1989 if (err < 0)
1990 return err;
1991
1992 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1993 hw->period_bytes_min, hw->buffer_bytes_max);
1994 if (err < 0)
1995 return err;
1996
1997 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1998 snd_pcm_hw_rule_buffer_bytes_max, substream,
1999 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2000 if (err < 0)
2001 return err;
2002
2003 /* FIXME: remove */
2004 if (runtime->dma_bytes) {
2005 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2006 if (err < 0)
2007 return err;
2008 }
2009
2010 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2011 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2012 snd_pcm_hw_rule_rate, hw,
2013 SNDRV_PCM_HW_PARAM_RATE, -1);
2014 if (err < 0)
2015 return err;
2016 }
2017
2018 /* FIXME: this belong to lowlevel */
2019 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2020
2021 return 0;
2022}
2023
2024static void pcm_release_private(struct snd_pcm_substream *substream)
2025{
2026 snd_pcm_unlink(substream);
2027}
2028
2029void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2030{
2031 substream->ref_count--;
2032 if (substream->ref_count > 0)
2033 return;
2034
2035 snd_pcm_drop(substream);
2036 if (substream->hw_opened) {
2037 if (substream->ops->hw_free != NULL)
2038 substream->ops->hw_free(substream);
2039 substream->ops->close(substream);
2040 substream->hw_opened = 0;
2041 }
2042 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2043 pm_qos_remove_request(&substream->latency_pm_qos_req);
2044 if (substream->pcm_release) {
2045 substream->pcm_release(substream);
2046 substream->pcm_release = NULL;
2047 }
2048 snd_pcm_detach_substream(substream);
2049}
2050
2051EXPORT_SYMBOL(snd_pcm_release_substream);
2052
2053int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2054 struct file *file,
2055 struct snd_pcm_substream **rsubstream)
2056{
2057 struct snd_pcm_substream *substream;
2058 int err;
2059
2060 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2061 if (err < 0)
2062 return err;
2063 if (substream->ref_count > 1) {
2064 *rsubstream = substream;
2065 return 0;
2066 }
2067
2068 err = snd_pcm_hw_constraints_init(substream);
2069 if (err < 0) {
2070 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2071 goto error;
2072 }
2073
2074 if ((err = substream->ops->open(substream)) < 0)
2075 goto error;
2076
2077 substream->hw_opened = 1;
2078
2079 err = snd_pcm_hw_constraints_complete(substream);
2080 if (err < 0) {
2081 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2082 goto error;
2083 }
2084
2085 *rsubstream = substream;
2086 return 0;
2087
2088 error:
2089 snd_pcm_release_substream(substream);
2090 return err;
2091}
2092
2093EXPORT_SYMBOL(snd_pcm_open_substream);
2094
2095static int snd_pcm_open_file(struct file *file,
2096 struct snd_pcm *pcm,
2097 int stream)
2098{
2099 struct snd_pcm_file *pcm_file;
2100 struct snd_pcm_substream *substream;
2101 int err;
2102
2103 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2104 if (err < 0)
2105 return err;
2106
2107 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2108 if (pcm_file == NULL) {
2109 snd_pcm_release_substream(substream);
2110 return -ENOMEM;
2111 }
2112 pcm_file->substream = substream;
2113 if (substream->ref_count == 1) {
2114 substream->file = pcm_file;
2115 substream->pcm_release = pcm_release_private;
2116 }
2117 file->private_data = pcm_file;
2118
2119 return 0;
2120}
2121
2122static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2123{
2124 struct snd_pcm *pcm;
2125 int err = nonseekable_open(inode, file);
2126 if (err < 0)
2127 return err;
2128 pcm = snd_lookup_minor_data(iminor(inode),
2129 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2130 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2131 if (pcm)
2132 snd_card_unref(pcm->card);
2133 return err;
2134}
2135
2136static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2137{
2138 struct snd_pcm *pcm;
2139 int err = nonseekable_open(inode, file);
2140 if (err < 0)
2141 return err;
2142 pcm = snd_lookup_minor_data(iminor(inode),
2143 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2144 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2145 if (pcm)
2146 snd_card_unref(pcm->card);
2147 return err;
2148}
2149
2150static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2151{
2152 int err;
2153 wait_queue_t wait;
2154
2155 if (pcm == NULL) {
2156 err = -ENODEV;
2157 goto __error1;
2158 }
2159 err = snd_card_file_add(pcm->card, file);
2160 if (err < 0)
2161 goto __error1;
2162 if (!try_module_get(pcm->card->module)) {
2163 err = -EFAULT;
2164 goto __error2;
2165 }
2166 init_waitqueue_entry(&wait, current);
2167 add_wait_queue(&pcm->open_wait, &wait);
2168 mutex_lock(&pcm->open_mutex);
2169 while (1) {
2170 err = snd_pcm_open_file(file, pcm, stream);
2171 if (err >= 0)
2172 break;
2173 if (err == -EAGAIN) {
2174 if (file->f_flags & O_NONBLOCK) {
2175 err = -EBUSY;
2176 break;
2177 }
2178 } else
2179 break;
2180 set_current_state(TASK_INTERRUPTIBLE);
2181 mutex_unlock(&pcm->open_mutex);
2182 schedule();
2183 mutex_lock(&pcm->open_mutex);
2184 if (pcm->card->shutdown) {
2185 err = -ENODEV;
2186 break;
2187 }
2188 if (signal_pending(current)) {
2189 err = -ERESTARTSYS;
2190 break;
2191 }
2192 }
2193 remove_wait_queue(&pcm->open_wait, &wait);
2194 mutex_unlock(&pcm->open_mutex);
2195 if (err < 0)
2196 goto __error;
2197 return err;
2198
2199 __error:
2200 module_put(pcm->card->module);
2201 __error2:
2202 snd_card_file_remove(pcm->card, file);
2203 __error1:
2204 return err;
2205}
2206
2207static int snd_pcm_release(struct inode *inode, struct file *file)
2208{
2209 struct snd_pcm *pcm;
2210 struct snd_pcm_substream *substream;
2211 struct snd_pcm_file *pcm_file;
2212
2213 pcm_file = file->private_data;
2214 substream = pcm_file->substream;
2215 if (snd_BUG_ON(!substream))
2216 return -ENXIO;
2217 pcm = substream->pcm;
2218 mutex_lock(&pcm->open_mutex);
2219 snd_pcm_release_substream(substream);
2220 kfree(pcm_file);
2221 mutex_unlock(&pcm->open_mutex);
2222 wake_up(&pcm->open_wait);
2223 module_put(pcm->card->module);
2224 snd_card_file_remove(pcm->card, file);
2225 return 0;
2226}
2227
2228static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2229 snd_pcm_uframes_t frames)
2230{
2231 struct snd_pcm_runtime *runtime = substream->runtime;
2232 snd_pcm_sframes_t appl_ptr;
2233 snd_pcm_sframes_t ret;
2234 snd_pcm_sframes_t hw_avail;
2235
2236 if (frames == 0)
2237 return 0;
2238
2239 snd_pcm_stream_lock_irq(substream);
2240 switch (runtime->status->state) {
2241 case SNDRV_PCM_STATE_PREPARED:
2242 break;
2243 case SNDRV_PCM_STATE_DRAINING:
2244 case SNDRV_PCM_STATE_RUNNING:
2245 if (snd_pcm_update_hw_ptr(substream) >= 0)
2246 break;
2247 /* Fall through */
2248 case SNDRV_PCM_STATE_XRUN:
2249 ret = -EPIPE;
2250 goto __end;
2251 case SNDRV_PCM_STATE_SUSPENDED:
2252 ret = -ESTRPIPE;
2253 goto __end;
2254 default:
2255 ret = -EBADFD;
2256 goto __end;
2257 }
2258
2259 hw_avail = snd_pcm_playback_hw_avail(runtime);
2260 if (hw_avail <= 0) {
2261 ret = 0;
2262 goto __end;
2263 }
2264 if (frames > (snd_pcm_uframes_t)hw_avail)
2265 frames = hw_avail;
2266 appl_ptr = runtime->control->appl_ptr - frames;
2267 if (appl_ptr < 0)
2268 appl_ptr += runtime->boundary;
2269 runtime->control->appl_ptr = appl_ptr;
2270 ret = frames;
2271 __end:
2272 snd_pcm_stream_unlock_irq(substream);
2273 return ret;
2274}
2275
2276static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2277 snd_pcm_uframes_t frames)
2278{
2279 struct snd_pcm_runtime *runtime = substream->runtime;
2280 snd_pcm_sframes_t appl_ptr;
2281 snd_pcm_sframes_t ret;
2282 snd_pcm_sframes_t hw_avail;
2283
2284 if (frames == 0)
2285 return 0;
2286
2287 snd_pcm_stream_lock_irq(substream);
2288 switch (runtime->status->state) {
2289 case SNDRV_PCM_STATE_PREPARED:
2290 case SNDRV_PCM_STATE_DRAINING:
2291 break;
2292 case SNDRV_PCM_STATE_RUNNING:
2293 if (snd_pcm_update_hw_ptr(substream) >= 0)
2294 break;
2295 /* Fall through */
2296 case SNDRV_PCM_STATE_XRUN:
2297 ret = -EPIPE;
2298 goto __end;
2299 case SNDRV_PCM_STATE_SUSPENDED:
2300 ret = -ESTRPIPE;
2301 goto __end;
2302 default:
2303 ret = -EBADFD;
2304 goto __end;
2305 }
2306
2307 hw_avail = snd_pcm_capture_hw_avail(runtime);
2308 if (hw_avail <= 0) {
2309 ret = 0;
2310 goto __end;
2311 }
2312 if (frames > (snd_pcm_uframes_t)hw_avail)
2313 frames = hw_avail;
2314 appl_ptr = runtime->control->appl_ptr - frames;
2315 if (appl_ptr < 0)
2316 appl_ptr += runtime->boundary;
2317 runtime->control->appl_ptr = appl_ptr;
2318 ret = frames;
2319 __end:
2320 snd_pcm_stream_unlock_irq(substream);
2321 return ret;
2322}
2323
2324static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2325 snd_pcm_uframes_t frames)
2326{
2327 struct snd_pcm_runtime *runtime = substream->runtime;
2328 snd_pcm_sframes_t appl_ptr;
2329 snd_pcm_sframes_t ret;
2330 snd_pcm_sframes_t avail;
2331
2332 if (frames == 0)
2333 return 0;
2334
2335 snd_pcm_stream_lock_irq(substream);
2336 switch (runtime->status->state) {
2337 case SNDRV_PCM_STATE_PREPARED:
2338 case SNDRV_PCM_STATE_PAUSED:
2339 break;
2340 case SNDRV_PCM_STATE_DRAINING:
2341 case SNDRV_PCM_STATE_RUNNING:
2342 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343 break;
2344 /* Fall through */
2345 case SNDRV_PCM_STATE_XRUN:
2346 ret = -EPIPE;
2347 goto __end;
2348 case SNDRV_PCM_STATE_SUSPENDED:
2349 ret = -ESTRPIPE;
2350 goto __end;
2351 default:
2352 ret = -EBADFD;
2353 goto __end;
2354 }
2355
2356 avail = snd_pcm_playback_avail(runtime);
2357 if (avail <= 0) {
2358 ret = 0;
2359 goto __end;
2360 }
2361 if (frames > (snd_pcm_uframes_t)avail)
2362 frames = avail;
2363 appl_ptr = runtime->control->appl_ptr + frames;
2364 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365 appl_ptr -= runtime->boundary;
2366 runtime->control->appl_ptr = appl_ptr;
2367 ret = frames;
2368 __end:
2369 snd_pcm_stream_unlock_irq(substream);
2370 return ret;
2371}
2372
2373static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2374 snd_pcm_uframes_t frames)
2375{
2376 struct snd_pcm_runtime *runtime = substream->runtime;
2377 snd_pcm_sframes_t appl_ptr;
2378 snd_pcm_sframes_t ret;
2379 snd_pcm_sframes_t avail;
2380
2381 if (frames == 0)
2382 return 0;
2383
2384 snd_pcm_stream_lock_irq(substream);
2385 switch (runtime->status->state) {
2386 case SNDRV_PCM_STATE_PREPARED:
2387 case SNDRV_PCM_STATE_DRAINING:
2388 case SNDRV_PCM_STATE_PAUSED:
2389 break;
2390 case SNDRV_PCM_STATE_RUNNING:
2391 if (snd_pcm_update_hw_ptr(substream) >= 0)
2392 break;
2393 /* Fall through */
2394 case SNDRV_PCM_STATE_XRUN:
2395 ret = -EPIPE;
2396 goto __end;
2397 case SNDRV_PCM_STATE_SUSPENDED:
2398 ret = -ESTRPIPE;
2399 goto __end;
2400 default:
2401 ret = -EBADFD;
2402 goto __end;
2403 }
2404
2405 avail = snd_pcm_capture_avail(runtime);
2406 if (avail <= 0) {
2407 ret = 0;
2408 goto __end;
2409 }
2410 if (frames > (snd_pcm_uframes_t)avail)
2411 frames = avail;
2412 appl_ptr = runtime->control->appl_ptr + frames;
2413 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2414 appl_ptr -= runtime->boundary;
2415 runtime->control->appl_ptr = appl_ptr;
2416 ret = frames;
2417 __end:
2418 snd_pcm_stream_unlock_irq(substream);
2419 return ret;
2420}
2421
2422static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2423{
2424 struct snd_pcm_runtime *runtime = substream->runtime;
2425 int err;
2426
2427 snd_pcm_stream_lock_irq(substream);
2428 switch (runtime->status->state) {
2429 case SNDRV_PCM_STATE_DRAINING:
2430 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2431 goto __badfd;
2432 /* Fall through */
2433 case SNDRV_PCM_STATE_RUNNING:
2434 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2435 break;
2436 /* Fall through */
2437 case SNDRV_PCM_STATE_PREPARED:
2438 case SNDRV_PCM_STATE_SUSPENDED:
2439 err = 0;
2440 break;
2441 case SNDRV_PCM_STATE_XRUN:
2442 err = -EPIPE;
2443 break;
2444 default:
2445 __badfd:
2446 err = -EBADFD;
2447 break;
2448 }
2449 snd_pcm_stream_unlock_irq(substream);
2450 return err;
2451}
2452
2453static int snd_pcm_delay(struct snd_pcm_substream *substream,
2454 snd_pcm_sframes_t __user *res)
2455{
2456 struct snd_pcm_runtime *runtime = substream->runtime;
2457 int err;
2458 snd_pcm_sframes_t n = 0;
2459
2460 snd_pcm_stream_lock_irq(substream);
2461 switch (runtime->status->state) {
2462 case SNDRV_PCM_STATE_DRAINING:
2463 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2464 goto __badfd;
2465 /* Fall through */
2466 case SNDRV_PCM_STATE_RUNNING:
2467 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2468 break;
2469 /* Fall through */
2470 case SNDRV_PCM_STATE_PREPARED:
2471 case SNDRV_PCM_STATE_SUSPENDED:
2472 err = 0;
2473 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2474 n = snd_pcm_playback_hw_avail(runtime);
2475 else
2476 n = snd_pcm_capture_avail(runtime);
2477 n += runtime->delay;
2478 break;
2479 case SNDRV_PCM_STATE_XRUN:
2480 err = -EPIPE;
2481 break;
2482 default:
2483 __badfd:
2484 err = -EBADFD;
2485 break;
2486 }
2487 snd_pcm_stream_unlock_irq(substream);
2488 if (!err)
2489 if (put_user(n, res))
2490 err = -EFAULT;
2491 return err;
2492}
2493
2494static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2495 struct snd_pcm_sync_ptr __user *_sync_ptr)
2496{
2497 struct snd_pcm_runtime *runtime = substream->runtime;
2498 struct snd_pcm_sync_ptr sync_ptr;
2499 volatile struct snd_pcm_mmap_status *status;
2500 volatile struct snd_pcm_mmap_control *control;
2501 int err;
2502
2503 memset(&sync_ptr, 0, sizeof(sync_ptr));
2504 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2505 return -EFAULT;
2506 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2507 return -EFAULT;
2508 status = runtime->status;
2509 control = runtime->control;
2510 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2511 err = snd_pcm_hwsync(substream);
2512 if (err < 0)
2513 return err;
2514 }
2515 snd_pcm_stream_lock_irq(substream);
2516 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2517 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2518 else
2519 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2520 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2521 control->avail_min = sync_ptr.c.control.avail_min;
2522 else
2523 sync_ptr.c.control.avail_min = control->avail_min;
2524 sync_ptr.s.status.state = status->state;
2525 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2526 sync_ptr.s.status.tstamp = status->tstamp;
2527 sync_ptr.s.status.suspended_state = status->suspended_state;
2528 snd_pcm_stream_unlock_irq(substream);
2529 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2530 return -EFAULT;
2531 return 0;
2532}
2533
2534static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2535{
2536 struct snd_pcm_runtime *runtime = substream->runtime;
2537 int arg;
2538
2539 if (get_user(arg, _arg))
2540 return -EFAULT;
2541 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2542 return -EINVAL;
2543 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2544 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2545 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2546 return 0;
2547}
2548
2549static int snd_pcm_common_ioctl1(struct file *file,
2550 struct snd_pcm_substream *substream,
2551 unsigned int cmd, void __user *arg)
2552{
2553 switch (cmd) {
2554 case SNDRV_PCM_IOCTL_PVERSION:
2555 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2556 case SNDRV_PCM_IOCTL_INFO:
2557 return snd_pcm_info_user(substream, arg);
2558 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2559 return 0;
2560 case SNDRV_PCM_IOCTL_TTSTAMP:
2561 return snd_pcm_tstamp(substream, arg);
2562 case SNDRV_PCM_IOCTL_HW_REFINE:
2563 return snd_pcm_hw_refine_user(substream, arg);
2564 case SNDRV_PCM_IOCTL_HW_PARAMS:
2565 return snd_pcm_hw_params_user(substream, arg);
2566 case SNDRV_PCM_IOCTL_HW_FREE:
2567 return snd_pcm_hw_free(substream);
2568 case SNDRV_PCM_IOCTL_SW_PARAMS:
2569 return snd_pcm_sw_params_user(substream, arg);
2570 case SNDRV_PCM_IOCTL_STATUS:
2571 return snd_pcm_status_user(substream, arg);
2572 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2573 return snd_pcm_channel_info_user(substream, arg);
2574 case SNDRV_PCM_IOCTL_PREPARE:
2575 return snd_pcm_prepare(substream, file);
2576 case SNDRV_PCM_IOCTL_RESET:
2577 return snd_pcm_reset(substream);
2578 case SNDRV_PCM_IOCTL_START:
2579 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2580 case SNDRV_PCM_IOCTL_LINK:
2581 return snd_pcm_link(substream, (int)(unsigned long) arg);
2582 case SNDRV_PCM_IOCTL_UNLINK:
2583 return snd_pcm_unlink(substream);
2584 case SNDRV_PCM_IOCTL_RESUME:
2585 return snd_pcm_resume(substream);
2586 case SNDRV_PCM_IOCTL_XRUN:
2587 return snd_pcm_xrun(substream);
2588 case SNDRV_PCM_IOCTL_HWSYNC:
2589 return snd_pcm_hwsync(substream);
2590 case SNDRV_PCM_IOCTL_DELAY:
2591 return snd_pcm_delay(substream, arg);
2592 case SNDRV_PCM_IOCTL_SYNC_PTR:
2593 return snd_pcm_sync_ptr(substream, arg);
2594#ifdef CONFIG_SND_SUPPORT_OLD_API
2595 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2596 return snd_pcm_hw_refine_old_user(substream, arg);
2597 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2598 return snd_pcm_hw_params_old_user(substream, arg);
2599#endif
2600 case SNDRV_PCM_IOCTL_DRAIN:
2601 return snd_pcm_drain(substream, file);
2602 case SNDRV_PCM_IOCTL_DROP:
2603 return snd_pcm_drop(substream);
2604 case SNDRV_PCM_IOCTL_PAUSE:
2605 {
2606 int res;
2607 snd_pcm_stream_lock_irq(substream);
2608 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2609 snd_pcm_stream_unlock_irq(substream);
2610 return res;
2611 }
2612 }
2613 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2614 return -ENOTTY;
2615}
2616
2617static int snd_pcm_playback_ioctl1(struct file *file,
2618 struct snd_pcm_substream *substream,
2619 unsigned int cmd, void __user *arg)
2620{
2621 if (snd_BUG_ON(!substream))
2622 return -ENXIO;
2623 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2624 return -EINVAL;
2625 switch (cmd) {
2626 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2627 {
2628 struct snd_xferi xferi;
2629 struct snd_xferi __user *_xferi = arg;
2630 struct snd_pcm_runtime *runtime = substream->runtime;
2631 snd_pcm_sframes_t result;
2632 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2633 return -EBADFD;
2634 if (put_user(0, &_xferi->result))
2635 return -EFAULT;
2636 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2637 return -EFAULT;
2638 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2639 __put_user(result, &_xferi->result);
2640 return result < 0 ? result : 0;
2641 }
2642 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2643 {
2644 struct snd_xfern xfern;
2645 struct snd_xfern __user *_xfern = arg;
2646 struct snd_pcm_runtime *runtime = substream->runtime;
2647 void __user **bufs;
2648 snd_pcm_sframes_t result;
2649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2650 return -EBADFD;
2651 if (runtime->channels > 128)
2652 return -EINVAL;
2653 if (put_user(0, &_xfern->result))
2654 return -EFAULT;
2655 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2656 return -EFAULT;
2657
2658 bufs = memdup_user(xfern.bufs,
2659 sizeof(void *) * runtime->channels);
2660 if (IS_ERR(bufs))
2661 return PTR_ERR(bufs);
2662 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2663 kfree(bufs);
2664 __put_user(result, &_xfern->result);
2665 return result < 0 ? result : 0;
2666 }
2667 case SNDRV_PCM_IOCTL_REWIND:
2668 {
2669 snd_pcm_uframes_t frames;
2670 snd_pcm_uframes_t __user *_frames = arg;
2671 snd_pcm_sframes_t result;
2672 if (get_user(frames, _frames))
2673 return -EFAULT;
2674 if (put_user(0, _frames))
2675 return -EFAULT;
2676 result = snd_pcm_playback_rewind(substream, frames);
2677 __put_user(result, _frames);
2678 return result < 0 ? result : 0;
2679 }
2680 case SNDRV_PCM_IOCTL_FORWARD:
2681 {
2682 snd_pcm_uframes_t frames;
2683 snd_pcm_uframes_t __user *_frames = arg;
2684 snd_pcm_sframes_t result;
2685 if (get_user(frames, _frames))
2686 return -EFAULT;
2687 if (put_user(0, _frames))
2688 return -EFAULT;
2689 result = snd_pcm_playback_forward(substream, frames);
2690 __put_user(result, _frames);
2691 return result < 0 ? result : 0;
2692 }
2693 }
2694 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2695}
2696
2697static int snd_pcm_capture_ioctl1(struct file *file,
2698 struct snd_pcm_substream *substream,
2699 unsigned int cmd, void __user *arg)
2700{
2701 if (snd_BUG_ON(!substream))
2702 return -ENXIO;
2703 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2704 return -EINVAL;
2705 switch (cmd) {
2706 case SNDRV_PCM_IOCTL_READI_FRAMES:
2707 {
2708 struct snd_xferi xferi;
2709 struct snd_xferi __user *_xferi = arg;
2710 struct snd_pcm_runtime *runtime = substream->runtime;
2711 snd_pcm_sframes_t result;
2712 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2713 return -EBADFD;
2714 if (put_user(0, &_xferi->result))
2715 return -EFAULT;
2716 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2717 return -EFAULT;
2718 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2719 __put_user(result, &_xferi->result);
2720 return result < 0 ? result : 0;
2721 }
2722 case SNDRV_PCM_IOCTL_READN_FRAMES:
2723 {
2724 struct snd_xfern xfern;
2725 struct snd_xfern __user *_xfern = arg;
2726 struct snd_pcm_runtime *runtime = substream->runtime;
2727 void *bufs;
2728 snd_pcm_sframes_t result;
2729 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2730 return -EBADFD;
2731 if (runtime->channels > 128)
2732 return -EINVAL;
2733 if (put_user(0, &_xfern->result))
2734 return -EFAULT;
2735 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2736 return -EFAULT;
2737
2738 bufs = memdup_user(xfern.bufs,
2739 sizeof(void *) * runtime->channels);
2740 if (IS_ERR(bufs))
2741 return PTR_ERR(bufs);
2742 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2743 kfree(bufs);
2744 __put_user(result, &_xfern->result);
2745 return result < 0 ? result : 0;
2746 }
2747 case SNDRV_PCM_IOCTL_REWIND:
2748 {
2749 snd_pcm_uframes_t frames;
2750 snd_pcm_uframes_t __user *_frames = arg;
2751 snd_pcm_sframes_t result;
2752 if (get_user(frames, _frames))
2753 return -EFAULT;
2754 if (put_user(0, _frames))
2755 return -EFAULT;
2756 result = snd_pcm_capture_rewind(substream, frames);
2757 __put_user(result, _frames);
2758 return result < 0 ? result : 0;
2759 }
2760 case SNDRV_PCM_IOCTL_FORWARD:
2761 {
2762 snd_pcm_uframes_t frames;
2763 snd_pcm_uframes_t __user *_frames = arg;
2764 snd_pcm_sframes_t result;
2765 if (get_user(frames, _frames))
2766 return -EFAULT;
2767 if (put_user(0, _frames))
2768 return -EFAULT;
2769 result = snd_pcm_capture_forward(substream, frames);
2770 __put_user(result, _frames);
2771 return result < 0 ? result : 0;
2772 }
2773 }
2774 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2775}
2776
2777static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2778 unsigned long arg)
2779{
2780 struct snd_pcm_file *pcm_file;
2781
2782 pcm_file = file->private_data;
2783
2784 if (((cmd >> 8) & 0xff) != 'A')
2785 return -ENOTTY;
2786
2787 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2788 (void __user *)arg);
2789}
2790
2791static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2792 unsigned long arg)
2793{
2794 struct snd_pcm_file *pcm_file;
2795
2796 pcm_file = file->private_data;
2797
2798 if (((cmd >> 8) & 0xff) != 'A')
2799 return -ENOTTY;
2800
2801 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2802 (void __user *)arg);
2803}
2804
2805int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2806 unsigned int cmd, void *arg)
2807{
2808 mm_segment_t fs;
2809 int result;
2810
2811 fs = snd_enter_user();
2812 switch (substream->stream) {
2813 case SNDRV_PCM_STREAM_PLAYBACK:
2814 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2815 (void __user *)arg);
2816 break;
2817 case SNDRV_PCM_STREAM_CAPTURE:
2818 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2819 (void __user *)arg);
2820 break;
2821 default:
2822 result = -EINVAL;
2823 break;
2824 }
2825 snd_leave_user(fs);
2826 return result;
2827}
2828
2829EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2830
2831static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2832 loff_t * offset)
2833{
2834 struct snd_pcm_file *pcm_file;
2835 struct snd_pcm_substream *substream;
2836 struct snd_pcm_runtime *runtime;
2837 snd_pcm_sframes_t result;
2838
2839 pcm_file = file->private_data;
2840 substream = pcm_file->substream;
2841 if (PCM_RUNTIME_CHECK(substream))
2842 return -ENXIO;
2843 runtime = substream->runtime;
2844 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2845 return -EBADFD;
2846 if (!frame_aligned(runtime, count))
2847 return -EINVAL;
2848 count = bytes_to_frames(runtime, count);
2849 result = snd_pcm_lib_read(substream, buf, count);
2850 if (result > 0)
2851 result = frames_to_bytes(runtime, result);
2852 return result;
2853}
2854
2855static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2856 size_t count, loff_t * offset)
2857{
2858 struct snd_pcm_file *pcm_file;
2859 struct snd_pcm_substream *substream;
2860 struct snd_pcm_runtime *runtime;
2861 snd_pcm_sframes_t result;
2862
2863 pcm_file = file->private_data;
2864 substream = pcm_file->substream;
2865 if (PCM_RUNTIME_CHECK(substream))
2866 return -ENXIO;
2867 runtime = substream->runtime;
2868 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2869 return -EBADFD;
2870 if (!frame_aligned(runtime, count))
2871 return -EINVAL;
2872 count = bytes_to_frames(runtime, count);
2873 result = snd_pcm_lib_write(substream, buf, count);
2874 if (result > 0)
2875 result = frames_to_bytes(runtime, result);
2876 return result;
2877}
2878
2879static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2880 unsigned long nr_segs, loff_t pos)
2881
2882{
2883 struct snd_pcm_file *pcm_file;
2884 struct snd_pcm_substream *substream;
2885 struct snd_pcm_runtime *runtime;
2886 snd_pcm_sframes_t result;
2887 unsigned long i;
2888 void __user **bufs;
2889 snd_pcm_uframes_t frames;
2890
2891 pcm_file = iocb->ki_filp->private_data;
2892 substream = pcm_file->substream;
2893 if (PCM_RUNTIME_CHECK(substream))
2894 return -ENXIO;
2895 runtime = substream->runtime;
2896 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2897 return -EBADFD;
2898 if (nr_segs > 1024 || nr_segs != runtime->channels)
2899 return -EINVAL;
2900 if (!frame_aligned(runtime, iov->iov_len))
2901 return -EINVAL;
2902 frames = bytes_to_samples(runtime, iov->iov_len);
2903 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2904 if (bufs == NULL)
2905 return -ENOMEM;
2906 for (i = 0; i < nr_segs; ++i)
2907 bufs[i] = iov[i].iov_base;
2908 result = snd_pcm_lib_readv(substream, bufs, frames);
2909 if (result > 0)
2910 result = frames_to_bytes(runtime, result);
2911 kfree(bufs);
2912 return result;
2913}
2914
2915static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2916 unsigned long nr_segs, loff_t pos)
2917{
2918 struct snd_pcm_file *pcm_file;
2919 struct snd_pcm_substream *substream;
2920 struct snd_pcm_runtime *runtime;
2921 snd_pcm_sframes_t result;
2922 unsigned long i;
2923 void __user **bufs;
2924 snd_pcm_uframes_t frames;
2925
2926 pcm_file = iocb->ki_filp->private_data;
2927 substream = pcm_file->substream;
2928 if (PCM_RUNTIME_CHECK(substream))
2929 return -ENXIO;
2930 runtime = substream->runtime;
2931 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932 return -EBADFD;
2933 if (nr_segs > 128 || nr_segs != runtime->channels ||
2934 !frame_aligned(runtime, iov->iov_len))
2935 return -EINVAL;
2936 frames = bytes_to_samples(runtime, iov->iov_len);
2937 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2938 if (bufs == NULL)
2939 return -ENOMEM;
2940 for (i = 0; i < nr_segs; ++i)
2941 bufs[i] = iov[i].iov_base;
2942 result = snd_pcm_lib_writev(substream, bufs, frames);
2943 if (result > 0)
2944 result = frames_to_bytes(runtime, result);
2945 kfree(bufs);
2946 return result;
2947}
2948
2949static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2950{
2951 struct snd_pcm_file *pcm_file;
2952 struct snd_pcm_substream *substream;
2953 struct snd_pcm_runtime *runtime;
2954 unsigned int mask;
2955 snd_pcm_uframes_t avail;
2956
2957 pcm_file = file->private_data;
2958
2959 substream = pcm_file->substream;
2960 if (PCM_RUNTIME_CHECK(substream))
2961 return -ENXIO;
2962 runtime = substream->runtime;
2963
2964 poll_wait(file, &runtime->sleep, wait);
2965
2966 snd_pcm_stream_lock_irq(substream);
2967 avail = snd_pcm_playback_avail(runtime);
2968 switch (runtime->status->state) {
2969 case SNDRV_PCM_STATE_RUNNING:
2970 case SNDRV_PCM_STATE_PREPARED:
2971 case SNDRV_PCM_STATE_PAUSED:
2972 if (avail >= runtime->control->avail_min) {
2973 mask = POLLOUT | POLLWRNORM;
2974 break;
2975 }
2976 /* Fall through */
2977 case SNDRV_PCM_STATE_DRAINING:
2978 mask = 0;
2979 break;
2980 default:
2981 mask = POLLOUT | POLLWRNORM | POLLERR;
2982 break;
2983 }
2984 snd_pcm_stream_unlock_irq(substream);
2985 return mask;
2986}
2987
2988static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2989{
2990 struct snd_pcm_file *pcm_file;
2991 struct snd_pcm_substream *substream;
2992 struct snd_pcm_runtime *runtime;
2993 unsigned int mask;
2994 snd_pcm_uframes_t avail;
2995
2996 pcm_file = file->private_data;
2997
2998 substream = pcm_file->substream;
2999 if (PCM_RUNTIME_CHECK(substream))
3000 return -ENXIO;
3001 runtime = substream->runtime;
3002
3003 poll_wait(file, &runtime->sleep, wait);
3004
3005 snd_pcm_stream_lock_irq(substream);
3006 avail = snd_pcm_capture_avail(runtime);
3007 switch (runtime->status->state) {
3008 case SNDRV_PCM_STATE_RUNNING:
3009 case SNDRV_PCM_STATE_PREPARED:
3010 case SNDRV_PCM_STATE_PAUSED:
3011 if (avail >= runtime->control->avail_min) {
3012 mask = POLLIN | POLLRDNORM;
3013 break;
3014 }
3015 mask = 0;
3016 break;
3017 case SNDRV_PCM_STATE_DRAINING:
3018 if (avail > 0) {
3019 mask = POLLIN | POLLRDNORM;
3020 break;
3021 }
3022 /* Fall through */
3023 default:
3024 mask = POLLIN | POLLRDNORM | POLLERR;
3025 break;
3026 }
3027 snd_pcm_stream_unlock_irq(substream);
3028 return mask;
3029}
3030
3031/*
3032 * mmap support
3033 */
3034
3035/*
3036 * Only on coherent architectures, we can mmap the status and the control records
3037 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3038 */
3039#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3040/*
3041 * mmap status record
3042 */
3043static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3044 struct vm_fault *vmf)
3045{
3046 struct snd_pcm_substream *substream = area->vm_private_data;
3047 struct snd_pcm_runtime *runtime;
3048
3049 if (substream == NULL)
3050 return VM_FAULT_SIGBUS;
3051 runtime = substream->runtime;
3052 vmf->page = virt_to_page(runtime->status);
3053 get_page(vmf->page);
3054 return 0;
3055}
3056
3057static const struct vm_operations_struct snd_pcm_vm_ops_status =
3058{
3059 .fault = snd_pcm_mmap_status_fault,
3060};
3061
3062static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3063 struct vm_area_struct *area)
3064{
3065 long size;
3066 if (!(area->vm_flags & VM_READ))
3067 return -EINVAL;
3068 size = area->vm_end - area->vm_start;
3069 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3070 return -EINVAL;
3071 area->vm_ops = &snd_pcm_vm_ops_status;
3072 area->vm_private_data = substream;
3073 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3074 return 0;
3075}
3076
3077/*
3078 * mmap control record
3079 */
3080static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3081 struct vm_fault *vmf)
3082{
3083 struct snd_pcm_substream *substream = area->vm_private_data;
3084 struct snd_pcm_runtime *runtime;
3085
3086 if (substream == NULL)
3087 return VM_FAULT_SIGBUS;
3088 runtime = substream->runtime;
3089 vmf->page = virt_to_page(runtime->control);
3090 get_page(vmf->page);
3091 return 0;
3092}
3093
3094static const struct vm_operations_struct snd_pcm_vm_ops_control =
3095{
3096 .fault = snd_pcm_mmap_control_fault,
3097};
3098
3099static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3100 struct vm_area_struct *area)
3101{
3102 long size;
3103 if (!(area->vm_flags & VM_READ))
3104 return -EINVAL;
3105 size = area->vm_end - area->vm_start;
3106 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3107 return -EINVAL;
3108 area->vm_ops = &snd_pcm_vm_ops_control;
3109 area->vm_private_data = substream;
3110 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3111 return 0;
3112}
3113#else /* ! coherent mmap */
3114/*
3115 * don't support mmap for status and control records.
3116 */
3117static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3118 struct vm_area_struct *area)
3119{
3120 return -ENXIO;
3121}
3122static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3123 struct vm_area_struct *area)
3124{
3125 return -ENXIO;
3126}
3127#endif /* coherent mmap */
3128
3129static inline struct page *
3130snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3131{
3132 void *vaddr = substream->runtime->dma_area + ofs;
3133#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3134 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3135 return virt_to_page(CAC_ADDR(vaddr));
3136#endif
3137#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3138 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3139 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3140 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3141 /* assume dma_handle set via pfn_to_phys() in
3142 * mm/dma-noncoherent.c
3143 */
3144 return pfn_to_page(addr >> PAGE_SHIFT);
3145 }
3146#endif
3147 return virt_to_page(vaddr);
3148}
3149
3150/*
3151 * fault callback for mmapping a RAM page
3152 */
3153static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3154 struct vm_fault *vmf)
3155{
3156 struct snd_pcm_substream *substream = area->vm_private_data;
3157 struct snd_pcm_runtime *runtime;
3158 unsigned long offset;
3159 struct page * page;
3160 size_t dma_bytes;
3161
3162 if (substream == NULL)
3163 return VM_FAULT_SIGBUS;
3164 runtime = substream->runtime;
3165 offset = vmf->pgoff << PAGE_SHIFT;
3166 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3167 if (offset > dma_bytes - PAGE_SIZE)
3168 return VM_FAULT_SIGBUS;
3169 if (substream->ops->page)
3170 page = substream->ops->page(substream, offset);
3171 else
3172 page = snd_pcm_default_page_ops(substream, offset);
3173 if (!page)
3174 return VM_FAULT_SIGBUS;
3175 get_page(page);
3176 vmf->page = page;
3177 return 0;
3178}
3179
3180static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3181 .open = snd_pcm_mmap_data_open,
3182 .close = snd_pcm_mmap_data_close,
3183};
3184
3185static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3186 .open = snd_pcm_mmap_data_open,
3187 .close = snd_pcm_mmap_data_close,
3188 .fault = snd_pcm_mmap_data_fault,
3189};
3190
3191#ifndef ARCH_HAS_DMA_MMAP_COHERENT
3192/* This should be defined / handled globally! */
3193#ifdef CONFIG_ARM
3194#define ARCH_HAS_DMA_MMAP_COHERENT
3195#endif
3196#endif
3197
3198/*
3199 * mmap the DMA buffer on RAM
3200 */
3201int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3202 struct vm_area_struct *area)
3203{
3204 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3205#ifdef CONFIG_GENERIC_ALLOCATOR
3206 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3207 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3208 return remap_pfn_range(area, area->vm_start,
3209 substream->dma_buffer.addr >> PAGE_SHIFT,
3210 area->vm_end - area->vm_start, area->vm_page_prot);
3211 }
3212#endif /* CONFIG_GENERIC_ALLOCATOR */
3213#ifdef ARCH_HAS_DMA_MMAP_COHERENT
3214 if (!substream->ops->page &&
3215 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3216 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3217 area,
3218 substream->runtime->dma_area,
3219 substream->runtime->dma_addr,
3220 area->vm_end - area->vm_start);
3221#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3222 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3223 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3224 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3225#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3226 /* mmap with fault handler */
3227 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3228 return 0;
3229}
3230EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3231
3232/*
3233 * mmap the DMA buffer on I/O memory area
3234 */
3235#if SNDRV_PCM_INFO_MMAP_IOMEM
3236int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3237 struct vm_area_struct *area)
3238{
3239 struct snd_pcm_runtime *runtime = substream->runtime;;
3240
3241 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3242 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3243}
3244
3245EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3246#endif /* SNDRV_PCM_INFO_MMAP */
3247
3248/*
3249 * mmap DMA buffer
3250 */
3251int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3252 struct vm_area_struct *area)
3253{
3254 struct snd_pcm_runtime *runtime;
3255 long size;
3256 unsigned long offset;
3257 size_t dma_bytes;
3258 int err;
3259
3260 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3261 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3262 return -EINVAL;
3263 } else {
3264 if (!(area->vm_flags & VM_READ))
3265 return -EINVAL;
3266 }
3267 runtime = substream->runtime;
3268 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3269 return -EBADFD;
3270 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3271 return -ENXIO;
3272 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3273 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3274 return -EINVAL;
3275 size = area->vm_end - area->vm_start;
3276 offset = area->vm_pgoff << PAGE_SHIFT;
3277 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3278 if ((size_t)size > dma_bytes)
3279 return -EINVAL;
3280 if (offset > dma_bytes - size)
3281 return -EINVAL;
3282
3283 area->vm_ops = &snd_pcm_vm_ops_data;
3284 area->vm_private_data = substream;
3285 if (substream->ops->mmap)
3286 err = substream->ops->mmap(substream, area);
3287 else
3288 err = snd_pcm_lib_default_mmap(substream, area);
3289 if (!err)
3290 atomic_inc(&substream->mmap_count);
3291 return err;
3292}
3293
3294EXPORT_SYMBOL(snd_pcm_mmap_data);
3295
3296static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3297{
3298 struct snd_pcm_file * pcm_file;
3299 struct snd_pcm_substream *substream;
3300 unsigned long offset;
3301
3302 pcm_file = file->private_data;
3303 substream = pcm_file->substream;
3304 if (PCM_RUNTIME_CHECK(substream))
3305 return -ENXIO;
3306
3307 offset = area->vm_pgoff << PAGE_SHIFT;
3308 switch (offset) {
3309 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3310 if (pcm_file->no_compat_mmap)
3311 return -ENXIO;
3312 return snd_pcm_mmap_status(substream, file, area);
3313 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3314 if (pcm_file->no_compat_mmap)
3315 return -ENXIO;
3316 return snd_pcm_mmap_control(substream, file, area);
3317 default:
3318 return snd_pcm_mmap_data(substream, file, area);
3319 }
3320 return 0;
3321}
3322
3323static int snd_pcm_fasync(int fd, struct file * file, int on)
3324{
3325 struct snd_pcm_file * pcm_file;
3326 struct snd_pcm_substream *substream;
3327 struct snd_pcm_runtime *runtime;
3328
3329 pcm_file = file->private_data;
3330 substream = pcm_file->substream;
3331 if (PCM_RUNTIME_CHECK(substream))
3332 return -ENXIO;
3333 runtime = substream->runtime;
3334 return fasync_helper(fd, file, on, &runtime->fasync);
3335}
3336
3337/*
3338 * ioctl32 compat
3339 */
3340#ifdef CONFIG_COMPAT
3341#include "pcm_compat.c"
3342#else
3343#define snd_pcm_ioctl_compat NULL
3344#endif
3345
3346/*
3347 * To be removed helpers to keep binary compatibility
3348 */
3349
3350#ifdef CONFIG_SND_SUPPORT_OLD_API
3351#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3352#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3353
3354static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3355 struct snd_pcm_hw_params_old *oparams)
3356{
3357 unsigned int i;
3358
3359 memset(params, 0, sizeof(*params));
3360 params->flags = oparams->flags;
3361 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3362 params->masks[i].bits[0] = oparams->masks[i];
3363 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3364 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3365 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3366 params->info = oparams->info;
3367 params->msbits = oparams->msbits;
3368 params->rate_num = oparams->rate_num;
3369 params->rate_den = oparams->rate_den;
3370 params->fifo_size = oparams->fifo_size;
3371}
3372
3373static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3374 struct snd_pcm_hw_params *params)
3375{
3376 unsigned int i;
3377
3378 memset(oparams, 0, sizeof(*oparams));
3379 oparams->flags = params->flags;
3380 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3381 oparams->masks[i] = params->masks[i].bits[0];
3382 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3383 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3384 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3385 oparams->info = params->info;
3386 oparams->msbits = params->msbits;
3387 oparams->rate_num = params->rate_num;
3388 oparams->rate_den = params->rate_den;
3389 oparams->fifo_size = params->fifo_size;
3390}
3391
3392static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3393 struct snd_pcm_hw_params_old __user * _oparams)
3394{
3395 struct snd_pcm_hw_params *params;
3396 struct snd_pcm_hw_params_old *oparams = NULL;
3397 int err;
3398
3399 params = kmalloc(sizeof(*params), GFP_KERNEL);
3400 if (!params)
3401 return -ENOMEM;
3402
3403 oparams = memdup_user(_oparams, sizeof(*oparams));
3404 if (IS_ERR(oparams)) {
3405 err = PTR_ERR(oparams);
3406 goto out;
3407 }
3408 snd_pcm_hw_convert_from_old_params(params, oparams);
3409 err = snd_pcm_hw_refine(substream, params);
3410 snd_pcm_hw_convert_to_old_params(oparams, params);
3411 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3412 if (!err)
3413 err = -EFAULT;
3414 }
3415
3416 kfree(oparams);
3417out:
3418 kfree(params);
3419 return err;
3420}
3421
3422static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3423 struct snd_pcm_hw_params_old __user * _oparams)
3424{
3425 struct snd_pcm_hw_params *params;
3426 struct snd_pcm_hw_params_old *oparams = NULL;
3427 int err;
3428
3429 params = kmalloc(sizeof(*params), GFP_KERNEL);
3430 if (!params)
3431 return -ENOMEM;
3432
3433 oparams = memdup_user(_oparams, sizeof(*oparams));
3434 if (IS_ERR(oparams)) {
3435 err = PTR_ERR(oparams);
3436 goto out;
3437 }
3438 snd_pcm_hw_convert_from_old_params(params, oparams);
3439 err = snd_pcm_hw_params(substream, params);
3440 snd_pcm_hw_convert_to_old_params(oparams, params);
3441 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3442 if (!err)
3443 err = -EFAULT;
3444 }
3445
3446 kfree(oparams);
3447out:
3448 kfree(params);
3449 return err;
3450}
3451#endif /* CONFIG_SND_SUPPORT_OLD_API */
3452
3453#ifndef CONFIG_MMU
3454static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3455 unsigned long addr,
3456 unsigned long len,
3457 unsigned long pgoff,
3458 unsigned long flags)
3459{
3460 struct snd_pcm_file *pcm_file = file->private_data;
3461 struct snd_pcm_substream *substream = pcm_file->substream;
3462 struct snd_pcm_runtime *runtime = substream->runtime;
3463 unsigned long offset = pgoff << PAGE_SHIFT;
3464
3465 switch (offset) {
3466 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3467 return (unsigned long)runtime->status;
3468 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3469 return (unsigned long)runtime->control;
3470 default:
3471 return (unsigned long)runtime->dma_area + offset;
3472 }
3473}
3474#else
3475# define snd_pcm_get_unmapped_area NULL
3476#endif
3477
3478/*
3479 * Register section
3480 */
3481
3482const struct file_operations snd_pcm_f_ops[2] = {
3483 {
3484 .owner = THIS_MODULE,
3485 .write = snd_pcm_write,
3486 .aio_write = snd_pcm_aio_write,
3487 .open = snd_pcm_playback_open,
3488 .release = snd_pcm_release,
3489 .llseek = no_llseek,
3490 .poll = snd_pcm_playback_poll,
3491 .unlocked_ioctl = snd_pcm_playback_ioctl,
3492 .compat_ioctl = snd_pcm_ioctl_compat,
3493 .mmap = snd_pcm_mmap,
3494 .fasync = snd_pcm_fasync,
3495 .get_unmapped_area = snd_pcm_get_unmapped_area,
3496 },
3497 {
3498 .owner = THIS_MODULE,
3499 .read = snd_pcm_read,
3500 .aio_read = snd_pcm_aio_read,
3501 .open = snd_pcm_capture_open,
3502 .release = snd_pcm_release,
3503 .llseek = no_llseek,
3504 .poll = snd_pcm_capture_poll,
3505 .unlocked_ioctl = snd_pcm_capture_ioctl,
3506 .compat_ioctl = snd_pcm_ioctl_compat,
3507 .mmap = snd_pcm_mmap,
3508 .fasync = snd_pcm_fasync,
3509 .get_unmapped_area = snd_pcm_get_unmapped_area,
3510 }
3511};