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