2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/sched/signal.h>
27 #include <linux/time.h>
28 #include <linux/pm_qos.h>
30 #include <linux/dma-mapping.h>
31 #include <sound/core.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/pcm.h>
35 #include <sound/pcm_params.h>
36 #include <sound/timer.h>
37 #include <sound/minors.h>
38 #include <linux/uio.h>
39 #include <linux/delay.h>
41 #include "pcm_local.h"
43 #ifdef CONFIG_SND_DEBUG
44 #define CREATE_TRACE_POINTS
45 #include "pcm_param_trace.h"
47 #define trace_hw_mask_param_enabled() 0
48 #define trace_hw_interval_param_enabled() 0
49 #define trace_hw_mask_param(substream, type, index, prev, curr)
50 #define trace_hw_interval_param(substream, type, index, prev, curr)
57 struct snd_pcm_hw_params_old {
59 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
60 SNDRV_PCM_HW_PARAM_ACCESS + 1];
61 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
62 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
67 unsigned int rate_num;
68 unsigned int rate_den;
69 snd_pcm_uframes_t fifo_size;
70 unsigned char reserved[64];
73 #ifdef CONFIG_SND_SUPPORT_OLD_API
74 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
75 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
77 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
78 struct snd_pcm_hw_params_old __user * _oparams);
79 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
80 struct snd_pcm_hw_params_old __user * _oparams);
82 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
88 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
89 static DECLARE_RWSEM(snd_pcm_link_rwsem);
91 /* Writer in rwsem may block readers even during its waiting in queue,
92 * and this may lead to a deadlock when the code path takes read sem
93 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
94 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
95 * sleep until all the readers are completed without blocking by writer.
97 static inline void down_write_nonfifo(struct rw_semaphore *lock)
99 while (!down_write_trylock(lock))
103 #define PCM_LOCK_DEFAULT 0
104 #define PCM_LOCK_IRQ 1
105 #define PCM_LOCK_IRQSAVE 2
107 static unsigned long __snd_pcm_stream_lock_mode(struct snd_pcm_substream *substream,
110 unsigned long flags = 0;
111 if (substream->pcm->nonatomic) {
112 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
113 mutex_lock(&substream->self_group.mutex);
116 case PCM_LOCK_DEFAULT:
117 read_lock(&snd_pcm_link_rwlock);
120 read_lock_irq(&snd_pcm_link_rwlock);
122 case PCM_LOCK_IRQSAVE:
123 read_lock_irqsave(&snd_pcm_link_rwlock, flags);
126 spin_lock(&substream->self_group.lock);
131 static void __snd_pcm_stream_unlock_mode(struct snd_pcm_substream *substream,
132 unsigned int mode, unsigned long flags)
134 if (substream->pcm->nonatomic) {
135 mutex_unlock(&substream->self_group.mutex);
136 up_read(&snd_pcm_link_rwsem);
138 spin_unlock(&substream->self_group.lock);
141 case PCM_LOCK_DEFAULT:
142 read_unlock(&snd_pcm_link_rwlock);
145 read_unlock_irq(&snd_pcm_link_rwlock);
147 case PCM_LOCK_IRQSAVE:
148 read_unlock_irqrestore(&snd_pcm_link_rwlock, flags);
155 * snd_pcm_stream_lock - Lock the PCM stream
156 * @substream: PCM substream
158 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
159 * flag of the given substream. This also takes the global link rw lock
160 * (or rw sem), too, for avoiding the race with linked streams.
162 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
164 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_DEFAULT);
166 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
169 * snd_pcm_stream_lock - Unlock the PCM stream
170 * @substream: PCM substream
172 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
174 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
176 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_DEFAULT, 0);
178 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
181 * snd_pcm_stream_lock_irq - Lock the PCM stream
182 * @substream: PCM substream
184 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
185 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
186 * as snd_pcm_stream_lock().
188 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
190 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQ);
192 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
195 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
196 * @substream: PCM substream
198 * This is a counter-part of snd_pcm_stream_lock_irq().
200 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
202 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQ, 0);
204 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
206 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
208 return __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQSAVE);
210 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
213 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
214 * @substream: PCM substream
217 * This is a counter-part of snd_pcm_stream_lock_irqsave().
219 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
222 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQSAVE, flags);
224 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
226 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
228 struct snd_pcm *pcm = substream->pcm;
229 struct snd_pcm_str *pstr = substream->pstr;
231 memset(info, 0, sizeof(*info));
232 info->card = pcm->card->number;
233 info->device = pcm->device;
234 info->stream = substream->stream;
235 info->subdevice = substream->number;
236 strlcpy(info->id, pcm->id, sizeof(info->id));
237 strlcpy(info->name, pcm->name, sizeof(info->name));
238 info->dev_class = pcm->dev_class;
239 info->dev_subclass = pcm->dev_subclass;
240 info->subdevices_count = pstr->substream_count;
241 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
242 strlcpy(info->subname, substream->name, sizeof(info->subname));
247 int snd_pcm_info_user(struct snd_pcm_substream *substream,
248 struct snd_pcm_info __user * _info)
250 struct snd_pcm_info *info;
253 info = kmalloc(sizeof(*info), GFP_KERNEL);
256 err = snd_pcm_info(substream, info);
258 if (copy_to_user(_info, info, sizeof(*info)))
265 static bool hw_support_mmap(struct snd_pcm_substream *substream)
267 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
269 /* architecture supports dma_mmap_coherent()? */
270 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
271 if (!substream->ops->mmap &&
272 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
278 static int constrain_mask_params(struct snd_pcm_substream *substream,
279 struct snd_pcm_hw_params *params)
281 struct snd_pcm_hw_constraints *constrs =
282 &substream->runtime->hw_constraints;
285 struct snd_mask old_mask;
288 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
289 m = hw_param_mask(params, k);
290 if (snd_mask_empty(m))
293 /* This parameter is not requested to change by a caller. */
294 if (!(params->rmask & (1 << k)))
297 if (trace_hw_mask_param_enabled())
300 changed = snd_mask_refine(m, constrs_mask(constrs, k));
306 /* Set corresponding flag so that the caller gets it. */
307 trace_hw_mask_param(substream, k, 0, &old_mask, m);
308 params->cmask |= 1 << k;
314 static int constrain_interval_params(struct snd_pcm_substream *substream,
315 struct snd_pcm_hw_params *params)
317 struct snd_pcm_hw_constraints *constrs =
318 &substream->runtime->hw_constraints;
319 struct snd_interval *i;
321 struct snd_interval old_interval;
324 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
325 i = hw_param_interval(params, k);
326 if (snd_interval_empty(i))
329 /* This parameter is not requested to change by a caller. */
330 if (!(params->rmask & (1 << k)))
333 if (trace_hw_interval_param_enabled())
336 changed = snd_interval_refine(i, constrs_interval(constrs, k));
342 /* Set corresponding flag so that the caller gets it. */
343 trace_hw_interval_param(substream, k, 0, &old_interval, i);
344 params->cmask |= 1 << k;
350 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
351 struct snd_pcm_hw_params *params)
353 struct snd_pcm_hw_constraints *constrs =
354 &substream->runtime->hw_constraints;
356 unsigned int *rstamps;
357 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
359 struct snd_pcm_hw_rule *r;
361 struct snd_mask old_mask;
362 struct snd_interval old_interval;
364 int changed, err = 0;
367 * Each application of rule has own sequence number.
369 * Each member of 'rstamps' array represents the sequence number of
370 * recent application of corresponding rule.
372 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
377 * Each member of 'vstamps' array represents the sequence number of
378 * recent application of rule in which corresponding parameters were
381 * In initial state, elements corresponding to parameters requested by
382 * a caller is 1. For unrequested parameters, corresponding members
383 * have 0 so that the parameters are never changed anymore.
385 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
386 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
388 /* Due to the above design, actual sequence number starts at 2. */
391 /* Apply all rules in order. */
393 for (k = 0; k < constrs->rules_num; k++) {
394 r = &constrs->rules[k];
397 * Check condition bits of this rule. When the rule has
398 * some condition bits, parameter without the bits is
399 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
400 * is an example of the condition bits.
402 if (r->cond && !(r->cond & params->flags))
406 * The 'deps' array includes maximum three dependencies
407 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
408 * member of this array is a sentinel and should be
411 * This rule should be processed in this time when dependent
412 * parameters were changed at former applications of the other
415 for (d = 0; r->deps[d] >= 0; d++) {
416 if (vstamps[r->deps[d]] > rstamps[k])
422 if (trace_hw_mask_param_enabled()) {
423 if (hw_is_mask(r->var))
424 old_mask = *hw_param_mask(params, r->var);
426 if (trace_hw_interval_param_enabled()) {
427 if (hw_is_interval(r->var))
428 old_interval = *hw_param_interval(params, r->var);
431 changed = r->func(params, r);
438 * When the parameter is changed, notify it to the caller
439 * by corresponding returned bit, then preparing for next
442 if (changed && r->var >= 0) {
443 if (hw_is_mask(r->var)) {
444 trace_hw_mask_param(substream, r->var,
446 hw_param_mask(params, r->var));
448 if (hw_is_interval(r->var)) {
449 trace_hw_interval_param(substream, r->var,
450 k + 1, &old_interval,
451 hw_param_interval(params, r->var));
454 params->cmask |= (1 << r->var);
455 vstamps[r->var] = stamp;
459 rstamps[k] = stamp++;
462 /* Iterate to evaluate all rules till no parameters are changed. */
471 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
472 struct snd_pcm_hw_params *params)
474 const struct snd_interval *i;
475 const struct snd_mask *m;
478 if (!params->msbits) {
479 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
480 if (snd_interval_single(i))
481 params->msbits = snd_interval_value(i);
484 if (!params->rate_den) {
485 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
486 if (snd_interval_single(i)) {
487 params->rate_num = snd_interval_value(i);
488 params->rate_den = 1;
492 if (!params->fifo_size) {
493 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
494 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
495 if (snd_mask_single(m) && snd_interval_single(i)) {
496 err = substream->ops->ioctl(substream,
497 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
504 params->info = substream->runtime->hw.info;
505 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
506 SNDRV_PCM_INFO_DRAIN_TRIGGER);
507 if (!hw_support_mmap(substream))
508 params->info &= ~(SNDRV_PCM_INFO_MMAP |
509 SNDRV_PCM_INFO_MMAP_VALID);
515 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
516 struct snd_pcm_hw_params *params)
521 params->fifo_size = 0;
522 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
524 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
525 params->rate_num = 0;
526 params->rate_den = 0;
529 err = constrain_mask_params(substream, params);
533 err = constrain_interval_params(substream, params);
537 err = constrain_params_by_rules(substream, params);
545 EXPORT_SYMBOL(snd_pcm_hw_refine);
547 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
548 struct snd_pcm_hw_params __user * _params)
550 struct snd_pcm_hw_params *params;
553 params = memdup_user(_params, sizeof(*params));
555 return PTR_ERR(params);
557 err = snd_pcm_hw_refine(substream, params);
561 err = fixup_unreferenced_params(substream, params);
565 if (copy_to_user(_params, params, sizeof(*params)))
572 static int period_to_usecs(struct snd_pcm_runtime *runtime)
577 return -1; /* invalid */
579 /* take 75% of period time as the deadline */
580 usecs = (750000 / runtime->rate) * runtime->period_size;
581 usecs += ((750000 % runtime->rate) * runtime->period_size) /
587 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
589 snd_pcm_stream_lock_irq(substream);
590 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
591 substream->runtime->status->state = state;
592 snd_pcm_stream_unlock_irq(substream);
595 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
598 #ifdef CONFIG_SND_PCM_TIMER
599 if (substream->timer)
600 snd_timer_notify(substream->timer, event,
601 &substream->runtime->trigger_tstamp);
606 * snd_pcm_hw_param_choose - choose a configuration defined by @params
608 * @params: the hw_params instance
610 * Choose one configuration from configuration space defined by @params.
611 * The configuration chosen is that obtained fixing in this order:
612 * first access, first format, first subformat, min channels,
613 * min rate, min period time, max buffer size, min tick time
615 * Return: Zero if successful, or a negative error code on failure.
617 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
618 struct snd_pcm_hw_params *params)
620 static const int vars[] = {
621 SNDRV_PCM_HW_PARAM_ACCESS,
622 SNDRV_PCM_HW_PARAM_FORMAT,
623 SNDRV_PCM_HW_PARAM_SUBFORMAT,
624 SNDRV_PCM_HW_PARAM_CHANNELS,
625 SNDRV_PCM_HW_PARAM_RATE,
626 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
627 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
628 SNDRV_PCM_HW_PARAM_TICK_TIME,
632 struct snd_mask old_mask;
633 struct snd_interval old_interval;
636 for (v = vars; *v != -1; v++) {
637 /* Keep old parameter to trace. */
638 if (trace_hw_mask_param_enabled()) {
640 old_mask = *hw_param_mask(params, *v);
642 if (trace_hw_interval_param_enabled()) {
643 if (hw_is_interval(*v))
644 old_interval = *hw_param_interval(params, *v);
646 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
647 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
649 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
655 /* Trace the changed parameter. */
656 if (hw_is_mask(*v)) {
657 trace_hw_mask_param(pcm, *v, 0, &old_mask,
658 hw_param_mask(params, *v));
660 if (hw_is_interval(*v)) {
661 trace_hw_interval_param(pcm, *v, 0, &old_interval,
662 hw_param_interval(params, *v));
669 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
670 struct snd_pcm_hw_params *params)
672 struct snd_pcm_runtime *runtime;
675 snd_pcm_uframes_t frames;
677 if (PCM_RUNTIME_CHECK(substream))
679 runtime = substream->runtime;
680 snd_pcm_stream_lock_irq(substream);
681 switch (runtime->status->state) {
682 case SNDRV_PCM_STATE_OPEN:
683 case SNDRV_PCM_STATE_SETUP:
684 case SNDRV_PCM_STATE_PREPARED:
687 snd_pcm_stream_unlock_irq(substream);
690 snd_pcm_stream_unlock_irq(substream);
691 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
692 if (!substream->oss.oss)
694 if (atomic_read(&substream->mmap_count))
698 err = snd_pcm_hw_refine(substream, params);
702 err = snd_pcm_hw_params_choose(substream, params);
706 err = fixup_unreferenced_params(substream, params);
710 if (substream->ops->hw_params != NULL) {
711 err = substream->ops->hw_params(substream, params);
716 runtime->access = params_access(params);
717 runtime->format = params_format(params);
718 runtime->subformat = params_subformat(params);
719 runtime->channels = params_channels(params);
720 runtime->rate = params_rate(params);
721 runtime->period_size = params_period_size(params);
722 runtime->periods = params_periods(params);
723 runtime->buffer_size = params_buffer_size(params);
724 runtime->info = params->info;
725 runtime->rate_num = params->rate_num;
726 runtime->rate_den = params->rate_den;
727 runtime->no_period_wakeup =
728 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
729 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
731 bits = snd_pcm_format_physical_width(runtime->format);
732 runtime->sample_bits = bits;
733 bits *= runtime->channels;
734 runtime->frame_bits = bits;
736 while (bits % 8 != 0) {
740 runtime->byte_align = bits / 8;
741 runtime->min_align = frames;
743 /* Default sw params */
744 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
745 runtime->period_step = 1;
746 runtime->control->avail_min = runtime->period_size;
747 runtime->start_threshold = 1;
748 runtime->stop_threshold = runtime->buffer_size;
749 runtime->silence_threshold = 0;
750 runtime->silence_size = 0;
751 runtime->boundary = runtime->buffer_size;
752 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
753 runtime->boundary *= 2;
755 /* clear the buffer for avoiding possible kernel info leaks */
756 if (runtime->dma_area && !substream->ops->copy_user) {
757 size_t size = runtime->dma_bytes;
759 if (runtime->info & SNDRV_PCM_INFO_MMAP)
760 size = PAGE_ALIGN(size);
761 memset(runtime->dma_area, 0, size);
764 snd_pcm_timer_resolution_change(substream);
765 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
767 if (pm_qos_request_active(&substream->latency_pm_qos_req))
768 pm_qos_remove_request(&substream->latency_pm_qos_req);
769 if ((usecs = period_to_usecs(runtime)) >= 0)
770 pm_qos_add_request(&substream->latency_pm_qos_req,
771 PM_QOS_CPU_DMA_LATENCY, usecs);
774 /* hardware might be unusable from this time,
775 so we force application to retry to set
776 the correct hardware parameter settings */
777 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
778 if (substream->ops->hw_free != NULL)
779 substream->ops->hw_free(substream);
783 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
784 struct snd_pcm_hw_params __user * _params)
786 struct snd_pcm_hw_params *params;
789 params = memdup_user(_params, sizeof(*params));
791 return PTR_ERR(params);
793 err = snd_pcm_hw_params(substream, params);
797 if (copy_to_user(_params, params, sizeof(*params)))
804 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
806 struct snd_pcm_runtime *runtime;
809 if (PCM_RUNTIME_CHECK(substream))
811 runtime = substream->runtime;
812 snd_pcm_stream_lock_irq(substream);
813 switch (runtime->status->state) {
814 case SNDRV_PCM_STATE_SETUP:
815 case SNDRV_PCM_STATE_PREPARED:
818 snd_pcm_stream_unlock_irq(substream);
821 snd_pcm_stream_unlock_irq(substream);
822 if (atomic_read(&substream->mmap_count))
824 if (substream->ops->hw_free)
825 result = substream->ops->hw_free(substream);
826 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
827 pm_qos_remove_request(&substream->latency_pm_qos_req);
831 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
832 struct snd_pcm_sw_params *params)
834 struct snd_pcm_runtime *runtime;
837 if (PCM_RUNTIME_CHECK(substream))
839 runtime = substream->runtime;
840 snd_pcm_stream_lock_irq(substream);
841 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
842 snd_pcm_stream_unlock_irq(substream);
845 snd_pcm_stream_unlock_irq(substream);
847 if (params->tstamp_mode < 0 ||
848 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
850 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
851 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
853 if (params->avail_min == 0)
855 if (params->silence_size >= runtime->boundary) {
856 if (params->silence_threshold != 0)
859 if (params->silence_size > params->silence_threshold)
861 if (params->silence_threshold > runtime->buffer_size)
865 snd_pcm_stream_lock_irq(substream);
866 runtime->tstamp_mode = params->tstamp_mode;
867 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
868 runtime->tstamp_type = params->tstamp_type;
869 runtime->period_step = params->period_step;
870 runtime->control->avail_min = params->avail_min;
871 runtime->start_threshold = params->start_threshold;
872 runtime->stop_threshold = params->stop_threshold;
873 runtime->silence_threshold = params->silence_threshold;
874 runtime->silence_size = params->silence_size;
875 params->boundary = runtime->boundary;
876 if (snd_pcm_running(substream)) {
877 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
878 runtime->silence_size > 0)
879 snd_pcm_playback_silence(substream, ULONG_MAX);
880 err = snd_pcm_update_state(substream, runtime);
882 snd_pcm_stream_unlock_irq(substream);
886 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
887 struct snd_pcm_sw_params __user * _params)
889 struct snd_pcm_sw_params params;
891 if (copy_from_user(¶ms, _params, sizeof(params)))
893 err = snd_pcm_sw_params(substream, ¶ms);
894 if (copy_to_user(_params, ¶ms, sizeof(params)))
899 static inline snd_pcm_uframes_t
900 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
902 snd_pcm_uframes_t delay;
904 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
905 delay = snd_pcm_playback_hw_avail(substream->runtime);
907 delay = snd_pcm_capture_avail(substream->runtime);
908 return delay + substream->runtime->delay;
911 int snd_pcm_status(struct snd_pcm_substream *substream,
912 struct snd_pcm_status *status)
914 struct snd_pcm_runtime *runtime = substream->runtime;
916 snd_pcm_stream_lock_irq(substream);
918 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
919 &runtime->audio_tstamp_config);
921 /* backwards compatible behavior */
922 if (runtime->audio_tstamp_config.type_requested ==
923 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
924 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
925 runtime->audio_tstamp_config.type_requested =
926 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
928 runtime->audio_tstamp_config.type_requested =
929 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
930 runtime->audio_tstamp_report.valid = 0;
932 runtime->audio_tstamp_report.valid = 1;
934 status->state = runtime->status->state;
935 status->suspended_state = runtime->status->suspended_state;
936 if (status->state == SNDRV_PCM_STATE_OPEN)
938 status->trigger_tstamp = runtime->trigger_tstamp;
939 if (snd_pcm_running(substream)) {
940 snd_pcm_update_hw_ptr(substream);
941 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
942 status->tstamp = runtime->status->tstamp;
943 status->driver_tstamp = runtime->driver_tstamp;
944 status->audio_tstamp =
945 runtime->status->audio_tstamp;
946 if (runtime->audio_tstamp_report.valid == 1)
947 /* backwards compatibility, no report provided in COMPAT mode */
948 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
949 &status->audio_tstamp_accuracy,
950 &runtime->audio_tstamp_report);
955 /* get tstamp only in fallback mode and only if enabled */
956 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
957 snd_pcm_gettime(runtime, &status->tstamp);
960 status->appl_ptr = runtime->control->appl_ptr;
961 status->hw_ptr = runtime->status->hw_ptr;
962 status->avail = snd_pcm_avail(substream);
963 status->delay = snd_pcm_running(substream) ?
964 snd_pcm_calc_delay(substream) : 0;
965 status->avail_max = runtime->avail_max;
966 status->overrange = runtime->overrange;
967 runtime->avail_max = 0;
968 runtime->overrange = 0;
970 snd_pcm_stream_unlock_irq(substream);
974 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
975 struct snd_pcm_status __user * _status,
978 struct snd_pcm_status status;
981 memset(&status, 0, sizeof(status));
983 * with extension, parameters are read/write,
984 * get audio_tstamp_data from user,
985 * ignore rest of status structure
987 if (ext && get_user(status.audio_tstamp_data,
988 (u32 __user *)(&_status->audio_tstamp_data)))
990 res = snd_pcm_status(substream, &status);
993 if (copy_to_user(_status, &status, sizeof(status)))
998 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
999 struct snd_pcm_channel_info * info)
1001 struct snd_pcm_runtime *runtime;
1002 unsigned int channel;
1004 channel = info->channel;
1005 runtime = substream->runtime;
1006 snd_pcm_stream_lock_irq(substream);
1007 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
1008 snd_pcm_stream_unlock_irq(substream);
1011 snd_pcm_stream_unlock_irq(substream);
1012 if (channel >= runtime->channels)
1014 memset(info, 0, sizeof(*info));
1015 info->channel = channel;
1016 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1019 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1020 struct snd_pcm_channel_info __user * _info)
1022 struct snd_pcm_channel_info info;
1025 if (copy_from_user(&info, _info, sizeof(info)))
1027 res = snd_pcm_channel_info(substream, &info);
1030 if (copy_to_user(_info, &info, sizeof(info)))
1035 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1037 struct snd_pcm_runtime *runtime = substream->runtime;
1038 if (runtime->trigger_master == NULL)
1040 if (runtime->trigger_master == substream) {
1041 if (!runtime->trigger_tstamp_latched)
1042 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1044 snd_pcm_trigger_tstamp(runtime->trigger_master);
1045 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1047 runtime->trigger_master = NULL;
1051 int (*pre_action)(struct snd_pcm_substream *substream, int state);
1052 int (*do_action)(struct snd_pcm_substream *substream, int state);
1053 void (*undo_action)(struct snd_pcm_substream *substream, int state);
1054 void (*post_action)(struct snd_pcm_substream *substream, int state);
1058 * this functions is core for handling of linked stream
1059 * Note: the stream state might be changed also on failure
1060 * Note2: call with calling stream lock + link lock
1062 static int snd_pcm_action_group(const struct action_ops *ops,
1063 struct snd_pcm_substream *substream,
1064 int state, int do_lock)
1066 struct snd_pcm_substream *s = NULL;
1067 struct snd_pcm_substream *s1;
1068 int res = 0, depth = 1;
1070 snd_pcm_group_for_each_entry(s, substream) {
1071 if (do_lock && s != substream) {
1072 if (s->pcm->nonatomic)
1073 mutex_lock_nested(&s->self_group.mutex, depth);
1075 spin_lock_nested(&s->self_group.lock, depth);
1078 res = ops->pre_action(s, state);
1082 snd_pcm_group_for_each_entry(s, substream) {
1083 res = ops->do_action(s, state);
1085 if (ops->undo_action) {
1086 snd_pcm_group_for_each_entry(s1, substream) {
1087 if (s1 == s) /* failed stream */
1089 ops->undo_action(s1, state);
1092 s = NULL; /* unlock all */
1096 snd_pcm_group_for_each_entry(s, substream) {
1097 ops->post_action(s, state);
1101 /* unlock streams */
1102 snd_pcm_group_for_each_entry(s1, substream) {
1103 if (s1 != substream) {
1104 if (s1->pcm->nonatomic)
1105 mutex_unlock(&s1->self_group.mutex);
1107 spin_unlock(&s1->self_group.lock);
1109 if (s1 == s) /* end */
1117 * Note: call with stream lock
1119 static int snd_pcm_action_single(const struct action_ops *ops,
1120 struct snd_pcm_substream *substream,
1125 res = ops->pre_action(substream, state);
1128 res = ops->do_action(substream, state);
1130 ops->post_action(substream, state);
1131 else if (ops->undo_action)
1132 ops->undo_action(substream, state);
1137 * Note: call with stream lock
1139 static int snd_pcm_action(const struct action_ops *ops,
1140 struct snd_pcm_substream *substream,
1145 if (!snd_pcm_stream_linked(substream))
1146 return snd_pcm_action_single(ops, substream, state);
1148 if (substream->pcm->nonatomic) {
1149 if (!mutex_trylock(&substream->group->mutex)) {
1150 mutex_unlock(&substream->self_group.mutex);
1151 mutex_lock(&substream->group->mutex);
1152 mutex_lock(&substream->self_group.mutex);
1154 res = snd_pcm_action_group(ops, substream, state, 1);
1155 mutex_unlock(&substream->group->mutex);
1157 if (!spin_trylock(&substream->group->lock)) {
1158 spin_unlock(&substream->self_group.lock);
1159 spin_lock(&substream->group->lock);
1160 spin_lock(&substream->self_group.lock);
1162 res = snd_pcm_action_group(ops, substream, state, 1);
1163 spin_unlock(&substream->group->lock);
1169 * Note: don't use any locks before
1171 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1172 struct snd_pcm_substream *substream,
1177 snd_pcm_stream_lock_irq(substream);
1178 res = snd_pcm_action(ops, substream, state);
1179 snd_pcm_stream_unlock_irq(substream);
1185 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1186 struct snd_pcm_substream *substream,
1191 down_read(&snd_pcm_link_rwsem);
1192 if (snd_pcm_stream_linked(substream))
1193 res = snd_pcm_action_group(ops, substream, state, 0);
1195 res = snd_pcm_action_single(ops, substream, state);
1196 up_read(&snd_pcm_link_rwsem);
1203 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1205 struct snd_pcm_runtime *runtime = substream->runtime;
1206 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1208 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1209 !snd_pcm_playback_data(substream))
1211 runtime->trigger_tstamp_latched = false;
1212 runtime->trigger_master = substream;
1216 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1218 if (substream->runtime->trigger_master != substream)
1220 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1223 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1225 if (substream->runtime->trigger_master == substream)
1226 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1229 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1231 struct snd_pcm_runtime *runtime = substream->runtime;
1232 snd_pcm_trigger_tstamp(substream);
1233 runtime->hw_ptr_jiffies = jiffies;
1234 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1236 runtime->status->state = state;
1237 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1238 runtime->silence_size > 0)
1239 snd_pcm_playback_silence(substream, ULONG_MAX);
1240 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1243 static const struct action_ops snd_pcm_action_start = {
1244 .pre_action = snd_pcm_pre_start,
1245 .do_action = snd_pcm_do_start,
1246 .undo_action = snd_pcm_undo_start,
1247 .post_action = snd_pcm_post_start
1251 * snd_pcm_start - start all linked streams
1252 * @substream: the PCM substream instance
1254 * Return: Zero if successful, or a negative error code.
1255 * The stream lock must be acquired before calling this function.
1257 int snd_pcm_start(struct snd_pcm_substream *substream)
1259 return snd_pcm_action(&snd_pcm_action_start, substream,
1260 SNDRV_PCM_STATE_RUNNING);
1263 /* take the stream lock and start the streams */
1264 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1266 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1267 SNDRV_PCM_STATE_RUNNING);
1273 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1275 struct snd_pcm_runtime *runtime = substream->runtime;
1276 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1278 runtime->trigger_master = substream;
1282 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1284 if (substream->runtime->trigger_master == substream &&
1285 snd_pcm_running(substream))
1286 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1287 return 0; /* unconditonally stop all substreams */
1290 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1292 struct snd_pcm_runtime *runtime = substream->runtime;
1293 if (runtime->status->state != state) {
1294 snd_pcm_trigger_tstamp(substream);
1295 runtime->status->state = state;
1296 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1298 wake_up(&runtime->sleep);
1299 wake_up(&runtime->tsleep);
1302 static const struct action_ops snd_pcm_action_stop = {
1303 .pre_action = snd_pcm_pre_stop,
1304 .do_action = snd_pcm_do_stop,
1305 .post_action = snd_pcm_post_stop
1309 * snd_pcm_stop - try to stop all running streams in the substream group
1310 * @substream: the PCM substream instance
1311 * @state: PCM state after stopping the stream
1313 * The state of each stream is then changed to the given state unconditionally.
1315 * Return: Zero if successful, or a negative error code.
1317 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1319 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1321 EXPORT_SYMBOL(snd_pcm_stop);
1324 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1325 * @substream: the PCM substream
1327 * After stopping, the state is changed to SETUP.
1328 * Unlike snd_pcm_stop(), this affects only the given stream.
1330 * Return: Zero if succesful, or a negative error code.
1332 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1334 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1335 SNDRV_PCM_STATE_SETUP);
1339 * snd_pcm_stop_xrun - stop the running streams as XRUN
1340 * @substream: the PCM substream instance
1342 * This stops the given running substream (and all linked substreams) as XRUN.
1343 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1345 * Return: Zero if successful, or a negative error code.
1347 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1349 unsigned long flags;
1351 snd_pcm_stream_lock_irqsave(substream, flags);
1352 if (substream->runtime && snd_pcm_running(substream))
1353 __snd_pcm_xrun(substream);
1354 snd_pcm_stream_unlock_irqrestore(substream, flags);
1357 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1362 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1364 struct snd_pcm_runtime *runtime = substream->runtime;
1365 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1368 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1370 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1372 runtime->trigger_master = substream;
1376 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1378 if (substream->runtime->trigger_master != substream)
1380 /* some drivers might use hw_ptr to recover from the pause -
1381 update the hw_ptr now */
1383 snd_pcm_update_hw_ptr(substream);
1384 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1385 * a delta between the current jiffies, this gives a large enough
1386 * delta, effectively to skip the check once.
1388 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1389 return substream->ops->trigger(substream,
1390 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1391 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1394 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1396 if (substream->runtime->trigger_master == substream)
1397 substream->ops->trigger(substream,
1398 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1399 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1402 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1404 struct snd_pcm_runtime *runtime = substream->runtime;
1405 snd_pcm_trigger_tstamp(substream);
1407 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1408 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1409 wake_up(&runtime->sleep);
1410 wake_up(&runtime->tsleep);
1412 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1413 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1417 static const struct action_ops snd_pcm_action_pause = {
1418 .pre_action = snd_pcm_pre_pause,
1419 .do_action = snd_pcm_do_pause,
1420 .undo_action = snd_pcm_undo_pause,
1421 .post_action = snd_pcm_post_pause
1425 * Push/release the pause for all linked streams.
1427 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1429 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1435 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1437 struct snd_pcm_runtime *runtime = substream->runtime;
1438 switch (runtime->status->state) {
1439 case SNDRV_PCM_STATE_SUSPENDED:
1441 /* unresumable PCM state; return -EBUSY for skipping suspend */
1442 case SNDRV_PCM_STATE_OPEN:
1443 case SNDRV_PCM_STATE_SETUP:
1444 case SNDRV_PCM_STATE_DISCONNECTED:
1447 runtime->trigger_master = substream;
1451 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1453 struct snd_pcm_runtime *runtime = substream->runtime;
1454 if (runtime->trigger_master != substream)
1456 if (! snd_pcm_running(substream))
1458 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1459 return 0; /* suspend unconditionally */
1462 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1464 struct snd_pcm_runtime *runtime = substream->runtime;
1465 snd_pcm_trigger_tstamp(substream);
1466 runtime->status->suspended_state = runtime->status->state;
1467 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1468 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1469 wake_up(&runtime->sleep);
1470 wake_up(&runtime->tsleep);
1473 static const struct action_ops snd_pcm_action_suspend = {
1474 .pre_action = snd_pcm_pre_suspend,
1475 .do_action = snd_pcm_do_suspend,
1476 .post_action = snd_pcm_post_suspend
1480 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1481 * @substream: the PCM substream
1483 * After this call, all streams are changed to SUSPENDED state.
1485 * Return: Zero if successful (or @substream is %NULL), or a negative error
1488 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1491 unsigned long flags;
1496 snd_pcm_stream_lock_irqsave(substream, flags);
1497 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1498 snd_pcm_stream_unlock_irqrestore(substream, flags);
1501 EXPORT_SYMBOL(snd_pcm_suspend);
1504 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1505 * @pcm: the PCM instance
1507 * After this call, all streams are changed to SUSPENDED state.
1509 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1511 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1513 struct snd_pcm_substream *substream;
1514 int stream, err = 0;
1519 for (stream = 0; stream < 2; stream++) {
1520 for (substream = pcm->streams[stream].substream;
1521 substream; substream = substream->next) {
1522 /* FIXME: the open/close code should lock this as well */
1523 if (substream->runtime == NULL)
1527 * Skip BE dai link PCM's that are internal and may
1528 * not have their substream ops set.
1530 if (!substream->ops)
1533 err = snd_pcm_suspend(substream);
1534 if (err < 0 && err != -EBUSY)
1540 EXPORT_SYMBOL(snd_pcm_suspend_all);
1544 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1546 struct snd_pcm_runtime *runtime = substream->runtime;
1547 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1549 runtime->trigger_master = substream;
1553 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1555 struct snd_pcm_runtime *runtime = substream->runtime;
1556 if (runtime->trigger_master != substream)
1558 /* DMA not running previously? */
1559 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1560 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1561 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1563 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1566 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1568 if (substream->runtime->trigger_master == substream &&
1569 snd_pcm_running(substream))
1570 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1573 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1575 struct snd_pcm_runtime *runtime = substream->runtime;
1576 snd_pcm_trigger_tstamp(substream);
1577 runtime->status->state = runtime->status->suspended_state;
1578 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1581 static const struct action_ops snd_pcm_action_resume = {
1582 .pre_action = snd_pcm_pre_resume,
1583 .do_action = snd_pcm_do_resume,
1584 .undo_action = snd_pcm_undo_resume,
1585 .post_action = snd_pcm_post_resume
1588 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1590 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1595 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1600 #endif /* CONFIG_PM */
1605 * Change the RUNNING stream(s) to XRUN state.
1607 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1609 struct snd_pcm_runtime *runtime = substream->runtime;
1612 snd_pcm_stream_lock_irq(substream);
1613 switch (runtime->status->state) {
1614 case SNDRV_PCM_STATE_XRUN:
1615 result = 0; /* already there */
1617 case SNDRV_PCM_STATE_RUNNING:
1618 __snd_pcm_xrun(substream);
1624 snd_pcm_stream_unlock_irq(substream);
1631 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1633 struct snd_pcm_runtime *runtime = substream->runtime;
1634 switch (runtime->status->state) {
1635 case SNDRV_PCM_STATE_RUNNING:
1636 case SNDRV_PCM_STATE_PREPARED:
1637 case SNDRV_PCM_STATE_PAUSED:
1638 case SNDRV_PCM_STATE_SUSPENDED:
1645 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1647 struct snd_pcm_runtime *runtime = substream->runtime;
1648 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1651 snd_pcm_stream_lock_irq(substream);
1652 runtime->hw_ptr_base = 0;
1653 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1654 runtime->status->hw_ptr % runtime->period_size;
1655 runtime->silence_start = runtime->status->hw_ptr;
1656 runtime->silence_filled = 0;
1657 snd_pcm_stream_unlock_irq(substream);
1661 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1663 struct snd_pcm_runtime *runtime = substream->runtime;
1664 snd_pcm_stream_lock_irq(substream);
1665 runtime->control->appl_ptr = runtime->status->hw_ptr;
1666 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1667 runtime->silence_size > 0)
1668 snd_pcm_playback_silence(substream, ULONG_MAX);
1669 snd_pcm_stream_unlock_irq(substream);
1672 static const struct action_ops snd_pcm_action_reset = {
1673 .pre_action = snd_pcm_pre_reset,
1674 .do_action = snd_pcm_do_reset,
1675 .post_action = snd_pcm_post_reset
1678 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1680 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1686 /* we use the second argument for updating f_flags */
1687 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1690 struct snd_pcm_runtime *runtime = substream->runtime;
1691 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1692 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1694 if (snd_pcm_running(substream))
1696 substream->f_flags = f_flags;
1700 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1703 err = substream->ops->prepare(substream);
1706 return snd_pcm_do_reset(substream, 0);
1709 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1711 struct snd_pcm_runtime *runtime = substream->runtime;
1712 runtime->control->appl_ptr = runtime->status->hw_ptr;
1713 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1716 static const struct action_ops snd_pcm_action_prepare = {
1717 .pre_action = snd_pcm_pre_prepare,
1718 .do_action = snd_pcm_do_prepare,
1719 .post_action = snd_pcm_post_prepare
1723 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1724 * @substream: the PCM substream instance
1725 * @file: file to refer f_flags
1727 * Return: Zero if successful, or a negative error code.
1729 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1735 f_flags = file->f_flags;
1737 f_flags = substream->f_flags;
1739 snd_pcm_stream_lock_irq(substream);
1740 switch (substream->runtime->status->state) {
1741 case SNDRV_PCM_STATE_PAUSED:
1742 snd_pcm_pause(substream, 0);
1744 case SNDRV_PCM_STATE_SUSPENDED:
1745 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1748 snd_pcm_stream_unlock_irq(substream);
1750 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1751 substream, f_flags);
1758 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1760 struct snd_pcm_runtime *runtime = substream->runtime;
1761 switch (runtime->status->state) {
1762 case SNDRV_PCM_STATE_OPEN:
1763 case SNDRV_PCM_STATE_DISCONNECTED:
1764 case SNDRV_PCM_STATE_SUSPENDED:
1767 runtime->trigger_master = substream;
1771 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1773 struct snd_pcm_runtime *runtime = substream->runtime;
1774 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1775 switch (runtime->status->state) {
1776 case SNDRV_PCM_STATE_PREPARED:
1777 /* start playback stream if possible */
1778 if (! snd_pcm_playback_empty(substream)) {
1779 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1780 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1782 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1785 case SNDRV_PCM_STATE_RUNNING:
1786 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1788 case SNDRV_PCM_STATE_XRUN:
1789 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1795 /* stop running stream */
1796 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1797 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1798 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1799 snd_pcm_do_stop(substream, new_state);
1800 snd_pcm_post_stop(substream, new_state);
1804 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1805 runtime->trigger_master == substream &&
1806 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1807 return substream->ops->trigger(substream,
1808 SNDRV_PCM_TRIGGER_DRAIN);
1813 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1817 static const struct action_ops snd_pcm_action_drain_init = {
1818 .pre_action = snd_pcm_pre_drain_init,
1819 .do_action = snd_pcm_do_drain_init,
1820 .post_action = snd_pcm_post_drain_init
1823 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1826 * Drain the stream(s).
1827 * When the substream is linked, sync until the draining of all playback streams
1829 * After this call, all streams are supposed to be either SETUP or DRAINING
1830 * (capture only) state.
1832 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1835 struct snd_card *card;
1836 struct snd_pcm_runtime *runtime;
1837 struct snd_pcm_substream *s;
1838 wait_queue_entry_t wait;
1842 card = substream->pcm->card;
1843 runtime = substream->runtime;
1845 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1849 if (file->f_flags & O_NONBLOCK)
1851 } else if (substream->f_flags & O_NONBLOCK)
1854 down_read(&snd_pcm_link_rwsem);
1855 snd_pcm_stream_lock_irq(substream);
1857 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1858 snd_pcm_pause(substream, 0);
1860 /* pre-start/stop - all running streams are changed to DRAINING state */
1861 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1864 /* in non-blocking, we don't wait in ioctl but let caller poll */
1872 struct snd_pcm_runtime *to_check;
1873 if (signal_pending(current)) {
1874 result = -ERESTARTSYS;
1877 /* find a substream to drain */
1879 snd_pcm_group_for_each_entry(s, substream) {
1880 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1882 runtime = s->runtime;
1883 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1889 break; /* all drained */
1890 init_waitqueue_entry(&wait, current);
1891 add_wait_queue(&to_check->sleep, &wait);
1892 snd_pcm_stream_unlock_irq(substream);
1893 up_read(&snd_pcm_link_rwsem);
1894 if (runtime->no_period_wakeup)
1895 tout = MAX_SCHEDULE_TIMEOUT;
1898 if (runtime->rate) {
1899 long t = runtime->period_size * 2 / runtime->rate;
1900 tout = max(t, tout);
1902 tout = msecs_to_jiffies(tout * 1000);
1904 tout = schedule_timeout_interruptible(tout);
1905 down_read(&snd_pcm_link_rwsem);
1906 snd_pcm_stream_lock_irq(substream);
1907 remove_wait_queue(&to_check->sleep, &wait);
1908 if (card->shutdown) {
1913 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1916 dev_dbg(substream->pcm->card->dev,
1917 "playback drain error (DMA or IRQ trouble?)\n");
1918 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1926 snd_pcm_stream_unlock_irq(substream);
1927 up_read(&snd_pcm_link_rwsem);
1935 * Immediately put all linked substreams into SETUP state.
1937 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1939 struct snd_pcm_runtime *runtime;
1942 if (PCM_RUNTIME_CHECK(substream))
1944 runtime = substream->runtime;
1946 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1947 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1950 snd_pcm_stream_lock_irq(substream);
1952 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1953 snd_pcm_pause(substream, 0);
1955 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1956 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1957 snd_pcm_stream_unlock_irq(substream);
1963 static bool is_pcm_file(struct file *file)
1965 struct inode *inode = file_inode(file);
1968 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1970 minor = iminor(inode);
1971 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1972 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1978 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1981 struct snd_pcm_file *pcm_file;
1982 struct snd_pcm_substream *substream1;
1983 struct snd_pcm_group *group;
1984 struct fd f = fdget(fd);
1988 if (!is_pcm_file(f.file)) {
1992 pcm_file = f.file->private_data;
1993 substream1 = pcm_file->substream;
1994 if (substream == substream1) {
1999 group = kmalloc(sizeof(*group), GFP_KERNEL);
2004 down_write_nonfifo(&snd_pcm_link_rwsem);
2005 write_lock_irq(&snd_pcm_link_rwlock);
2006 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2007 substream->runtime->status->state != substream1->runtime->status->state ||
2008 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2012 if (snd_pcm_stream_linked(substream1)) {
2016 if (!snd_pcm_stream_linked(substream)) {
2017 substream->group = group;
2019 spin_lock_init(&substream->group->lock);
2020 mutex_init(&substream->group->mutex);
2021 INIT_LIST_HEAD(&substream->group->substreams);
2022 list_add_tail(&substream->link_list, &substream->group->substreams);
2023 substream->group->count = 1;
2025 list_add_tail(&substream1->link_list, &substream->group->substreams);
2026 substream->group->count++;
2027 substream1->group = substream->group;
2029 write_unlock_irq(&snd_pcm_link_rwlock);
2030 up_write(&snd_pcm_link_rwsem);
2032 snd_card_unref(substream1->pcm->card);
2039 static void relink_to_local(struct snd_pcm_substream *substream)
2041 substream->group = &substream->self_group;
2042 INIT_LIST_HEAD(&substream->self_group.substreams);
2043 list_add_tail(&substream->link_list, &substream->self_group.substreams);
2046 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2048 struct snd_pcm_substream *s;
2051 down_write_nonfifo(&snd_pcm_link_rwsem);
2052 write_lock_irq(&snd_pcm_link_rwlock);
2053 if (!snd_pcm_stream_linked(substream)) {
2057 list_del(&substream->link_list);
2058 substream->group->count--;
2059 if (substream->group->count == 1) { /* detach the last stream, too */
2060 snd_pcm_group_for_each_entry(s, substream) {
2064 kfree(substream->group);
2066 relink_to_local(substream);
2068 write_unlock_irq(&snd_pcm_link_rwlock);
2069 up_write(&snd_pcm_link_rwsem);
2076 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2077 struct snd_pcm_hw_rule *rule)
2079 struct snd_interval t;
2080 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2081 hw_param_interval_c(params, rule->deps[1]), &t);
2082 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2085 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2086 struct snd_pcm_hw_rule *rule)
2088 struct snd_interval t;
2089 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2090 hw_param_interval_c(params, rule->deps[1]), &t);
2091 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2094 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2095 struct snd_pcm_hw_rule *rule)
2097 struct snd_interval t;
2098 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2099 hw_param_interval_c(params, rule->deps[1]),
2100 (unsigned long) rule->private, &t);
2101 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2104 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2105 struct snd_pcm_hw_rule *rule)
2107 struct snd_interval t;
2108 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2109 (unsigned long) rule->private,
2110 hw_param_interval_c(params, rule->deps[1]), &t);
2111 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2114 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2115 struct snd_pcm_hw_rule *rule)
2118 const struct snd_interval *i =
2119 hw_param_interval_c(params, rule->deps[0]);
2121 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2123 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2125 if (! snd_mask_test(mask, k))
2127 bits = snd_pcm_format_physical_width(k);
2129 continue; /* ignore invalid formats */
2130 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2131 snd_mask_reset(&m, k);
2133 return snd_mask_refine(mask, &m);
2136 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2137 struct snd_pcm_hw_rule *rule)
2139 struct snd_interval t;
2145 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2147 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2149 bits = snd_pcm_format_physical_width(k);
2151 continue; /* ignore invalid formats */
2152 if (t.min > (unsigned)bits)
2154 if (t.max < (unsigned)bits)
2158 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2161 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2162 #error "Change this table"
2165 static const unsigned int rates[] = {
2166 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2167 48000, 64000, 88200, 96000, 176400, 192000
2170 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2171 .count = ARRAY_SIZE(rates),
2175 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2176 struct snd_pcm_hw_rule *rule)
2178 struct snd_pcm_hardware *hw = rule->private;
2179 return snd_interval_list(hw_param_interval(params, rule->var),
2180 snd_pcm_known_rates.count,
2181 snd_pcm_known_rates.list, hw->rates);
2184 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2185 struct snd_pcm_hw_rule *rule)
2187 struct snd_interval t;
2188 struct snd_pcm_substream *substream = rule->private;
2190 t.max = substream->buffer_bytes_max;
2194 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2197 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2199 struct snd_pcm_runtime *runtime = substream->runtime;
2200 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2203 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2204 snd_mask_any(constrs_mask(constrs, k));
2207 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2208 snd_interval_any(constrs_interval(constrs, k));
2211 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2212 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2213 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2214 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2215 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2217 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2218 snd_pcm_hw_rule_format, NULL,
2219 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2222 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2223 snd_pcm_hw_rule_sample_bits, NULL,
2224 SNDRV_PCM_HW_PARAM_FORMAT,
2225 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2228 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2229 snd_pcm_hw_rule_div, NULL,
2230 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2234 snd_pcm_hw_rule_mul, NULL,
2235 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2238 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2239 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2240 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
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_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2248 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2249 snd_pcm_hw_rule_div, NULL,
2250 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2253 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2254 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2255 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
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_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2263 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2264 snd_pcm_hw_rule_div, NULL,
2265 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2268 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2269 snd_pcm_hw_rule_div, NULL,
2270 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2273 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2274 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2275 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2278 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2279 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2280 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2283 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2284 snd_pcm_hw_rule_mul, NULL,
2285 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2288 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2289 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2290 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2293 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2294 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2295 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2298 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2299 snd_pcm_hw_rule_muldivk, (void*) 8,
2300 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2303 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2304 snd_pcm_hw_rule_muldivk, (void*) 8,
2305 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2308 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2309 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2310 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2313 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2314 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2315 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2321 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2323 struct snd_pcm_runtime *runtime = substream->runtime;
2324 struct snd_pcm_hardware *hw = &runtime->hw;
2326 unsigned int mask = 0;
2328 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2329 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2330 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2331 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2332 if (hw_support_mmap(substream)) {
2333 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2334 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2335 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2336 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2337 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2338 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2340 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2344 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2348 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2352 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2353 hw->channels_min, hw->channels_max);
2357 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2358 hw->rate_min, hw->rate_max);
2362 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2363 hw->period_bytes_min, hw->period_bytes_max);
2367 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2368 hw->periods_min, hw->periods_max);
2372 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2373 hw->period_bytes_min, hw->buffer_bytes_max);
2377 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2378 snd_pcm_hw_rule_buffer_bytes_max, substream,
2379 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2384 if (runtime->dma_bytes) {
2385 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2390 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2391 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2392 snd_pcm_hw_rule_rate, hw,
2393 SNDRV_PCM_HW_PARAM_RATE, -1);
2398 /* FIXME: this belong to lowlevel */
2399 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2404 static void pcm_release_private(struct snd_pcm_substream *substream)
2406 if (snd_pcm_stream_linked(substream))
2407 snd_pcm_unlink(substream);
2410 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2412 substream->ref_count--;
2413 if (substream->ref_count > 0)
2416 snd_pcm_drop(substream);
2417 if (substream->hw_opened) {
2418 if (substream->ops->hw_free &&
2419 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2420 substream->ops->hw_free(substream);
2421 substream->ops->close(substream);
2422 substream->hw_opened = 0;
2424 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2425 pm_qos_remove_request(&substream->latency_pm_qos_req);
2426 if (substream->pcm_release) {
2427 substream->pcm_release(substream);
2428 substream->pcm_release = NULL;
2430 snd_pcm_detach_substream(substream);
2432 EXPORT_SYMBOL(snd_pcm_release_substream);
2434 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2436 struct snd_pcm_substream **rsubstream)
2438 struct snd_pcm_substream *substream;
2441 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2444 if (substream->ref_count > 1) {
2445 *rsubstream = substream;
2449 err = snd_pcm_hw_constraints_init(substream);
2451 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2455 if ((err = substream->ops->open(substream)) < 0)
2458 substream->hw_opened = 1;
2460 err = snd_pcm_hw_constraints_complete(substream);
2462 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2466 *rsubstream = substream;
2470 snd_pcm_release_substream(substream);
2473 EXPORT_SYMBOL(snd_pcm_open_substream);
2475 static int snd_pcm_open_file(struct file *file,
2476 struct snd_pcm *pcm,
2479 struct snd_pcm_file *pcm_file;
2480 struct snd_pcm_substream *substream;
2483 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2487 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2488 if (pcm_file == NULL) {
2489 snd_pcm_release_substream(substream);
2492 pcm_file->substream = substream;
2493 if (substream->ref_count == 1) {
2494 substream->file = pcm_file;
2495 substream->pcm_release = pcm_release_private;
2497 file->private_data = pcm_file;
2502 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2504 struct snd_pcm *pcm;
2505 int err = nonseekable_open(inode, file);
2508 pcm = snd_lookup_minor_data(iminor(inode),
2509 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2510 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2512 snd_card_unref(pcm->card);
2516 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2518 struct snd_pcm *pcm;
2519 int err = nonseekable_open(inode, file);
2522 pcm = snd_lookup_minor_data(iminor(inode),
2523 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2524 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2526 snd_card_unref(pcm->card);
2530 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2533 wait_queue_entry_t wait;
2539 err = snd_card_file_add(pcm->card, file);
2542 if (!try_module_get(pcm->card->module)) {
2546 init_waitqueue_entry(&wait, current);
2547 add_wait_queue(&pcm->open_wait, &wait);
2548 mutex_lock(&pcm->open_mutex);
2550 err = snd_pcm_open_file(file, pcm, stream);
2553 if (err == -EAGAIN) {
2554 if (file->f_flags & O_NONBLOCK) {
2560 set_current_state(TASK_INTERRUPTIBLE);
2561 mutex_unlock(&pcm->open_mutex);
2563 mutex_lock(&pcm->open_mutex);
2564 if (pcm->card->shutdown) {
2568 if (signal_pending(current)) {
2573 remove_wait_queue(&pcm->open_wait, &wait);
2574 mutex_unlock(&pcm->open_mutex);
2580 module_put(pcm->card->module);
2582 snd_card_file_remove(pcm->card, file);
2587 static int snd_pcm_release(struct inode *inode, struct file *file)
2589 struct snd_pcm *pcm;
2590 struct snd_pcm_substream *substream;
2591 struct snd_pcm_file *pcm_file;
2593 pcm_file = file->private_data;
2594 substream = pcm_file->substream;
2595 if (snd_BUG_ON(!substream))
2597 pcm = substream->pcm;
2598 mutex_lock(&pcm->open_mutex);
2599 snd_pcm_release_substream(substream);
2601 mutex_unlock(&pcm->open_mutex);
2602 wake_up(&pcm->open_wait);
2603 module_put(pcm->card->module);
2604 snd_card_file_remove(pcm->card, file);
2608 /* check and update PCM state; return 0 or a negative error
2609 * call this inside PCM lock
2611 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2613 switch (substream->runtime->status->state) {
2614 case SNDRV_PCM_STATE_DRAINING:
2615 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2618 case SNDRV_PCM_STATE_RUNNING:
2619 return snd_pcm_update_hw_ptr(substream);
2620 case SNDRV_PCM_STATE_PREPARED:
2621 case SNDRV_PCM_STATE_PAUSED:
2623 case SNDRV_PCM_STATE_SUSPENDED:
2625 case SNDRV_PCM_STATE_XRUN:
2632 /* increase the appl_ptr; returns the processed frames or a negative error */
2633 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2634 snd_pcm_uframes_t frames,
2635 snd_pcm_sframes_t avail)
2637 struct snd_pcm_runtime *runtime = substream->runtime;
2638 snd_pcm_sframes_t appl_ptr;
2643 if (frames > (snd_pcm_uframes_t)avail)
2645 appl_ptr = runtime->control->appl_ptr + frames;
2646 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2647 appl_ptr -= runtime->boundary;
2648 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2649 return ret < 0 ? ret : frames;
2652 /* decrease the appl_ptr; returns the processed frames or zero for error */
2653 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2654 snd_pcm_uframes_t frames,
2655 snd_pcm_sframes_t avail)
2657 struct snd_pcm_runtime *runtime = substream->runtime;
2658 snd_pcm_sframes_t appl_ptr;
2663 if (frames > (snd_pcm_uframes_t)avail)
2665 appl_ptr = runtime->control->appl_ptr - frames;
2667 appl_ptr += runtime->boundary;
2668 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2669 /* NOTE: we return zero for errors because PulseAudio gets depressed
2670 * upon receiving an error from rewind ioctl and stops processing
2671 * any longer. Returning zero means that no rewind is done, so
2672 * it's not absolutely wrong to answer like that.
2674 return ret < 0 ? 0 : frames;
2677 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2678 snd_pcm_uframes_t frames)
2680 snd_pcm_sframes_t ret;
2685 snd_pcm_stream_lock_irq(substream);
2686 ret = do_pcm_hwsync(substream);
2688 ret = rewind_appl_ptr(substream, frames,
2689 snd_pcm_hw_avail(substream));
2690 snd_pcm_stream_unlock_irq(substream);
2694 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2695 snd_pcm_uframes_t frames)
2697 snd_pcm_sframes_t ret;
2702 snd_pcm_stream_lock_irq(substream);
2703 ret = do_pcm_hwsync(substream);
2705 ret = forward_appl_ptr(substream, frames,
2706 snd_pcm_avail(substream));
2707 snd_pcm_stream_unlock_irq(substream);
2711 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2715 snd_pcm_stream_lock_irq(substream);
2716 err = do_pcm_hwsync(substream);
2717 snd_pcm_stream_unlock_irq(substream);
2721 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2722 snd_pcm_sframes_t *delay)
2725 snd_pcm_sframes_t n = 0;
2727 snd_pcm_stream_lock_irq(substream);
2728 err = do_pcm_hwsync(substream);
2730 n = snd_pcm_calc_delay(substream);
2731 snd_pcm_stream_unlock_irq(substream);
2737 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2738 struct snd_pcm_sync_ptr __user *_sync_ptr)
2740 struct snd_pcm_runtime *runtime = substream->runtime;
2741 struct snd_pcm_sync_ptr sync_ptr;
2742 volatile struct snd_pcm_mmap_status *status;
2743 volatile struct snd_pcm_mmap_control *control;
2746 memset(&sync_ptr, 0, sizeof(sync_ptr));
2747 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2749 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2751 status = runtime->status;
2752 control = runtime->control;
2753 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2754 err = snd_pcm_hwsync(substream);
2758 snd_pcm_stream_lock_irq(substream);
2759 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2760 err = pcm_lib_apply_appl_ptr(substream,
2761 sync_ptr.c.control.appl_ptr);
2763 snd_pcm_stream_unlock_irq(substream);
2767 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2769 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2770 control->avail_min = sync_ptr.c.control.avail_min;
2772 sync_ptr.c.control.avail_min = control->avail_min;
2773 sync_ptr.s.status.state = status->state;
2774 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2775 sync_ptr.s.status.tstamp = status->tstamp;
2776 sync_ptr.s.status.suspended_state = status->suspended_state;
2777 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2778 snd_pcm_stream_unlock_irq(substream);
2779 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2784 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2786 struct snd_pcm_runtime *runtime = substream->runtime;
2789 if (get_user(arg, _arg))
2791 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2793 runtime->tstamp_type = arg;
2797 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2798 struct snd_xferi __user *_xferi)
2800 struct snd_xferi xferi;
2801 struct snd_pcm_runtime *runtime = substream->runtime;
2802 snd_pcm_sframes_t result;
2804 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2806 if (put_user(0, &_xferi->result))
2808 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2810 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2811 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2813 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2814 __put_user(result, &_xferi->result);
2815 return result < 0 ? result : 0;
2818 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2819 struct snd_xfern __user *_xfern)
2821 struct snd_xfern xfern;
2822 struct snd_pcm_runtime *runtime = substream->runtime;
2824 snd_pcm_sframes_t result;
2826 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2828 if (runtime->channels > 128)
2830 if (put_user(0, &_xfern->result))
2832 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2835 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2837 return PTR_ERR(bufs);
2838 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2839 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2841 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2843 __put_user(result, &_xfern->result);
2844 return result < 0 ? result : 0;
2847 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2848 snd_pcm_uframes_t __user *_frames)
2850 snd_pcm_uframes_t frames;
2851 snd_pcm_sframes_t result;
2853 if (get_user(frames, _frames))
2855 if (put_user(0, _frames))
2857 result = snd_pcm_rewind(substream, frames);
2858 __put_user(result, _frames);
2859 return result < 0 ? result : 0;
2862 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2863 snd_pcm_uframes_t __user *_frames)
2865 snd_pcm_uframes_t frames;
2866 snd_pcm_sframes_t result;
2868 if (get_user(frames, _frames))
2870 if (put_user(0, _frames))
2872 result = snd_pcm_forward(substream, frames);
2873 __put_user(result, _frames);
2874 return result < 0 ? result : 0;
2877 static int snd_pcm_common_ioctl(struct file *file,
2878 struct snd_pcm_substream *substream,
2879 unsigned int cmd, void __user *arg)
2881 struct snd_pcm_file *pcm_file = file->private_data;
2884 if (PCM_RUNTIME_CHECK(substream))
2887 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2892 case SNDRV_PCM_IOCTL_PVERSION:
2893 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2894 case SNDRV_PCM_IOCTL_INFO:
2895 return snd_pcm_info_user(substream, arg);
2896 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2898 case SNDRV_PCM_IOCTL_TTSTAMP:
2899 return snd_pcm_tstamp(substream, arg);
2900 case SNDRV_PCM_IOCTL_USER_PVERSION:
2901 if (get_user(pcm_file->user_pversion,
2902 (unsigned int __user *)arg))
2905 case SNDRV_PCM_IOCTL_HW_REFINE:
2906 return snd_pcm_hw_refine_user(substream, arg);
2907 case SNDRV_PCM_IOCTL_HW_PARAMS:
2908 return snd_pcm_hw_params_user(substream, arg);
2909 case SNDRV_PCM_IOCTL_HW_FREE:
2910 return snd_pcm_hw_free(substream);
2911 case SNDRV_PCM_IOCTL_SW_PARAMS:
2912 return snd_pcm_sw_params_user(substream, arg);
2913 case SNDRV_PCM_IOCTL_STATUS:
2914 return snd_pcm_status_user(substream, arg, false);
2915 case SNDRV_PCM_IOCTL_STATUS_EXT:
2916 return snd_pcm_status_user(substream, arg, true);
2917 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2918 return snd_pcm_channel_info_user(substream, arg);
2919 case SNDRV_PCM_IOCTL_PREPARE:
2920 return snd_pcm_prepare(substream, file);
2921 case SNDRV_PCM_IOCTL_RESET:
2922 return snd_pcm_reset(substream);
2923 case SNDRV_PCM_IOCTL_START:
2924 return snd_pcm_start_lock_irq(substream);
2925 case SNDRV_PCM_IOCTL_LINK:
2926 return snd_pcm_link(substream, (int)(unsigned long) arg);
2927 case SNDRV_PCM_IOCTL_UNLINK:
2928 return snd_pcm_unlink(substream);
2929 case SNDRV_PCM_IOCTL_RESUME:
2930 return snd_pcm_resume(substream);
2931 case SNDRV_PCM_IOCTL_XRUN:
2932 return snd_pcm_xrun(substream);
2933 case SNDRV_PCM_IOCTL_HWSYNC:
2934 return snd_pcm_hwsync(substream);
2935 case SNDRV_PCM_IOCTL_DELAY:
2937 snd_pcm_sframes_t delay;
2938 snd_pcm_sframes_t __user *res = arg;
2941 err = snd_pcm_delay(substream, &delay);
2944 if (put_user(delay, res))
2948 case SNDRV_PCM_IOCTL_SYNC_PTR:
2949 return snd_pcm_sync_ptr(substream, arg);
2950 #ifdef CONFIG_SND_SUPPORT_OLD_API
2951 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2952 return snd_pcm_hw_refine_old_user(substream, arg);
2953 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2954 return snd_pcm_hw_params_old_user(substream, arg);
2956 case SNDRV_PCM_IOCTL_DRAIN:
2957 return snd_pcm_drain(substream, file);
2958 case SNDRV_PCM_IOCTL_DROP:
2959 return snd_pcm_drop(substream);
2960 case SNDRV_PCM_IOCTL_PAUSE:
2961 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2963 (int)(unsigned long)arg);
2964 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2965 case SNDRV_PCM_IOCTL_READI_FRAMES:
2966 return snd_pcm_xferi_frames_ioctl(substream, arg);
2967 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2968 case SNDRV_PCM_IOCTL_READN_FRAMES:
2969 return snd_pcm_xfern_frames_ioctl(substream, arg);
2970 case SNDRV_PCM_IOCTL_REWIND:
2971 return snd_pcm_rewind_ioctl(substream, arg);
2972 case SNDRV_PCM_IOCTL_FORWARD:
2973 return snd_pcm_forward_ioctl(substream, arg);
2975 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2979 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2982 struct snd_pcm_file *pcm_file;
2984 pcm_file = file->private_data;
2986 if (((cmd >> 8) & 0xff) != 'A')
2989 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2990 (void __user *)arg);
2994 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2995 * @substream: PCM substream
2997 * @arg: IOCTL argument
2999 * The function is provided primarily for OSS layer and USB gadget drivers,
3000 * and it allows only the limited set of ioctls (hw_params, sw_params,
3001 * prepare, start, drain, drop, forward).
3003 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3004 unsigned int cmd, void *arg)
3006 snd_pcm_uframes_t *frames = arg;
3007 snd_pcm_sframes_t result;
3010 case SNDRV_PCM_IOCTL_FORWARD:
3012 /* provided only for OSS; capture-only and no value returned */
3013 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3015 result = snd_pcm_forward(substream, *frames);
3016 return result < 0 ? result : 0;
3018 case SNDRV_PCM_IOCTL_HW_PARAMS:
3019 return snd_pcm_hw_params(substream, arg);
3020 case SNDRV_PCM_IOCTL_SW_PARAMS:
3021 return snd_pcm_sw_params(substream, arg);
3022 case SNDRV_PCM_IOCTL_PREPARE:
3023 return snd_pcm_prepare(substream, NULL);
3024 case SNDRV_PCM_IOCTL_START:
3025 return snd_pcm_start_lock_irq(substream);
3026 case SNDRV_PCM_IOCTL_DRAIN:
3027 return snd_pcm_drain(substream, NULL);
3028 case SNDRV_PCM_IOCTL_DROP:
3029 return snd_pcm_drop(substream);
3030 case SNDRV_PCM_IOCTL_DELAY:
3031 return snd_pcm_delay(substream, frames);
3036 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3038 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3041 struct snd_pcm_file *pcm_file;
3042 struct snd_pcm_substream *substream;
3043 struct snd_pcm_runtime *runtime;
3044 snd_pcm_sframes_t result;
3046 pcm_file = file->private_data;
3047 substream = pcm_file->substream;
3048 if (PCM_RUNTIME_CHECK(substream))
3050 runtime = substream->runtime;
3051 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3053 if (!frame_aligned(runtime, count))
3055 count = bytes_to_frames(runtime, count);
3056 result = snd_pcm_lib_read(substream, buf, count);
3058 result = frames_to_bytes(runtime, result);
3062 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3063 size_t count, loff_t * offset)
3065 struct snd_pcm_file *pcm_file;
3066 struct snd_pcm_substream *substream;
3067 struct snd_pcm_runtime *runtime;
3068 snd_pcm_sframes_t result;
3070 pcm_file = file->private_data;
3071 substream = pcm_file->substream;
3072 if (PCM_RUNTIME_CHECK(substream))
3074 runtime = substream->runtime;
3075 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3077 if (!frame_aligned(runtime, count))
3079 count = bytes_to_frames(runtime, count);
3080 result = snd_pcm_lib_write(substream, buf, count);
3082 result = frames_to_bytes(runtime, result);
3086 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3088 struct snd_pcm_file *pcm_file;
3089 struct snd_pcm_substream *substream;
3090 struct snd_pcm_runtime *runtime;
3091 snd_pcm_sframes_t result;
3094 snd_pcm_uframes_t frames;
3096 pcm_file = iocb->ki_filp->private_data;
3097 substream = pcm_file->substream;
3098 if (PCM_RUNTIME_CHECK(substream))
3100 runtime = substream->runtime;
3101 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3103 if (!iter_is_iovec(to))
3105 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3107 if (!frame_aligned(runtime, to->iov->iov_len))
3109 frames = bytes_to_samples(runtime, to->iov->iov_len);
3110 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3113 for (i = 0; i < to->nr_segs; ++i)
3114 bufs[i] = to->iov[i].iov_base;
3115 result = snd_pcm_lib_readv(substream, bufs, frames);
3117 result = frames_to_bytes(runtime, result);
3122 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3124 struct snd_pcm_file *pcm_file;
3125 struct snd_pcm_substream *substream;
3126 struct snd_pcm_runtime *runtime;
3127 snd_pcm_sframes_t result;
3130 snd_pcm_uframes_t frames;
3132 pcm_file = iocb->ki_filp->private_data;
3133 substream = pcm_file->substream;
3134 if (PCM_RUNTIME_CHECK(substream))
3136 runtime = substream->runtime;
3137 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3139 if (!iter_is_iovec(from))
3141 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3142 !frame_aligned(runtime, from->iov->iov_len))
3144 frames = bytes_to_samples(runtime, from->iov->iov_len);
3145 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3148 for (i = 0; i < from->nr_segs; ++i)
3149 bufs[i] = from->iov[i].iov_base;
3150 result = snd_pcm_lib_writev(substream, bufs, frames);
3152 result = frames_to_bytes(runtime, result);
3157 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3159 struct snd_pcm_file *pcm_file;
3160 struct snd_pcm_substream *substream;
3161 struct snd_pcm_runtime *runtime;
3163 snd_pcm_uframes_t avail;
3165 pcm_file = file->private_data;
3167 substream = pcm_file->substream;
3168 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3169 ok = EPOLLOUT | EPOLLWRNORM;
3171 ok = EPOLLIN | EPOLLRDNORM;
3172 if (PCM_RUNTIME_CHECK(substream))
3173 return ok | EPOLLERR;
3175 runtime = substream->runtime;
3176 poll_wait(file, &runtime->sleep, wait);
3179 snd_pcm_stream_lock_irq(substream);
3180 avail = snd_pcm_avail(substream);
3181 switch (runtime->status->state) {
3182 case SNDRV_PCM_STATE_RUNNING:
3183 case SNDRV_PCM_STATE_PREPARED:
3184 case SNDRV_PCM_STATE_PAUSED:
3185 if (avail >= runtime->control->avail_min)
3188 case SNDRV_PCM_STATE_DRAINING:
3189 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3196 mask = ok | EPOLLERR;
3199 snd_pcm_stream_unlock_irq(substream);
3208 * Only on coherent architectures, we can mmap the status and the control records
3209 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3211 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3213 * mmap status record
3215 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3217 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3218 struct snd_pcm_runtime *runtime;
3220 if (substream == NULL)
3221 return VM_FAULT_SIGBUS;
3222 runtime = substream->runtime;
3223 vmf->page = virt_to_page(runtime->status);
3224 get_page(vmf->page);
3228 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3230 .fault = snd_pcm_mmap_status_fault,
3233 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3234 struct vm_area_struct *area)
3237 if (!(area->vm_flags & VM_READ))
3239 size = area->vm_end - area->vm_start;
3240 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3242 area->vm_ops = &snd_pcm_vm_ops_status;
3243 area->vm_private_data = substream;
3244 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3249 * mmap control record
3251 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3253 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3254 struct snd_pcm_runtime *runtime;
3256 if (substream == NULL)
3257 return VM_FAULT_SIGBUS;
3258 runtime = substream->runtime;
3259 vmf->page = virt_to_page(runtime->control);
3260 get_page(vmf->page);
3264 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3266 .fault = snd_pcm_mmap_control_fault,
3269 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3270 struct vm_area_struct *area)
3273 if (!(area->vm_flags & VM_READ))
3275 size = area->vm_end - area->vm_start;
3276 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3278 area->vm_ops = &snd_pcm_vm_ops_control;
3279 area->vm_private_data = substream;
3280 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3284 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3286 if (pcm_file->no_compat_mmap)
3288 /* See pcm_control_mmap_allowed() below.
3289 * Since older alsa-lib requires both status and control mmaps to be
3290 * coupled, we have to disable the status mmap for old alsa-lib, too.
3292 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3293 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3298 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3300 if (pcm_file->no_compat_mmap)
3302 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3303 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3304 * thus it effectively assures the manual update of appl_ptr.
3306 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3311 #else /* ! coherent mmap */
3313 * don't support mmap for status and control records.
3315 #define pcm_status_mmap_allowed(pcm_file) false
3316 #define pcm_control_mmap_allowed(pcm_file) false
3318 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3319 struct vm_area_struct *area)
3323 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3324 struct vm_area_struct *area)
3328 #endif /* coherent mmap */
3330 static inline struct page *
3331 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3333 void *vaddr = substream->runtime->dma_area + ofs;
3334 return virt_to_page(vaddr);
3338 * fault callback for mmapping a RAM page
3340 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3342 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3343 struct snd_pcm_runtime *runtime;
3344 unsigned long offset;
3348 if (substream == NULL)
3349 return VM_FAULT_SIGBUS;
3350 runtime = substream->runtime;
3351 offset = vmf->pgoff << PAGE_SHIFT;
3352 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3353 if (offset > dma_bytes - PAGE_SIZE)
3354 return VM_FAULT_SIGBUS;
3355 if (substream->ops->page)
3356 page = substream->ops->page(substream, offset);
3358 page = snd_pcm_default_page_ops(substream, offset);
3360 return VM_FAULT_SIGBUS;
3366 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3367 .open = snd_pcm_mmap_data_open,
3368 .close = snd_pcm_mmap_data_close,
3371 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3372 .open = snd_pcm_mmap_data_open,
3373 .close = snd_pcm_mmap_data_close,
3374 .fault = snd_pcm_mmap_data_fault,
3378 * mmap the DMA buffer on RAM
3382 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3383 * @substream: PCM substream
3386 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3387 * this function is invoked implicitly.
3389 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3390 struct vm_area_struct *area)
3392 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3393 #ifdef CONFIG_GENERIC_ALLOCATOR
3394 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3395 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3396 return remap_pfn_range(area, area->vm_start,
3397 substream->dma_buffer.addr >> PAGE_SHIFT,
3398 area->vm_end - area->vm_start, area->vm_page_prot);
3400 #endif /* CONFIG_GENERIC_ALLOCATOR */
3401 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3402 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3403 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3404 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3406 substream->runtime->dma_area,
3407 substream->runtime->dma_addr,
3408 substream->runtime->dma_bytes);
3409 #endif /* CONFIG_X86 */
3410 /* mmap with fault handler */
3411 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3414 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3417 * mmap the DMA buffer on I/O memory area
3419 #if SNDRV_PCM_INFO_MMAP_IOMEM
3421 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3422 * @substream: PCM substream
3425 * When your hardware uses the iomapped pages as the hardware buffer and
3426 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3427 * is supposed to work only on limited architectures.
3429 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3430 struct vm_area_struct *area)
3432 struct snd_pcm_runtime *runtime = substream->runtime;
3434 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3435 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3437 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3438 #endif /* SNDRV_PCM_INFO_MMAP */
3443 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3444 struct vm_area_struct *area)
3446 struct snd_pcm_runtime *runtime;
3448 unsigned long offset;
3452 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3453 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3456 if (!(area->vm_flags & VM_READ))
3459 runtime = substream->runtime;
3460 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3462 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3464 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3465 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3467 size = area->vm_end - area->vm_start;
3468 offset = area->vm_pgoff << PAGE_SHIFT;
3469 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3470 if ((size_t)size > dma_bytes)
3472 if (offset > dma_bytes - size)
3475 area->vm_ops = &snd_pcm_vm_ops_data;
3476 area->vm_private_data = substream;
3477 if (substream->ops->mmap)
3478 err = substream->ops->mmap(substream, area);
3480 err = snd_pcm_lib_default_mmap(substream, area);
3482 atomic_inc(&substream->mmap_count);
3485 EXPORT_SYMBOL(snd_pcm_mmap_data);
3487 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3489 struct snd_pcm_file * pcm_file;
3490 struct snd_pcm_substream *substream;
3491 unsigned long offset;
3493 pcm_file = file->private_data;
3494 substream = pcm_file->substream;
3495 if (PCM_RUNTIME_CHECK(substream))
3498 offset = area->vm_pgoff << PAGE_SHIFT;
3500 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3501 if (!pcm_status_mmap_allowed(pcm_file))
3503 return snd_pcm_mmap_status(substream, file, area);
3504 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3505 if (!pcm_control_mmap_allowed(pcm_file))
3507 return snd_pcm_mmap_control(substream, file, area);
3509 return snd_pcm_mmap_data(substream, file, area);
3514 static int snd_pcm_fasync(int fd, struct file * file, int on)
3516 struct snd_pcm_file * pcm_file;
3517 struct snd_pcm_substream *substream;
3518 struct snd_pcm_runtime *runtime;
3520 pcm_file = file->private_data;
3521 substream = pcm_file->substream;
3522 if (PCM_RUNTIME_CHECK(substream))
3524 runtime = substream->runtime;
3525 return fasync_helper(fd, file, on, &runtime->fasync);
3531 #ifdef CONFIG_COMPAT
3532 #include "pcm_compat.c"
3534 #define snd_pcm_ioctl_compat NULL
3538 * To be removed helpers to keep binary compatibility
3541 #ifdef CONFIG_SND_SUPPORT_OLD_API
3542 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3543 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3545 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3546 struct snd_pcm_hw_params_old *oparams)
3550 memset(params, 0, sizeof(*params));
3551 params->flags = oparams->flags;
3552 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3553 params->masks[i].bits[0] = oparams->masks[i];
3554 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3555 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3556 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3557 params->info = oparams->info;
3558 params->msbits = oparams->msbits;
3559 params->rate_num = oparams->rate_num;
3560 params->rate_den = oparams->rate_den;
3561 params->fifo_size = oparams->fifo_size;
3564 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3565 struct snd_pcm_hw_params *params)
3569 memset(oparams, 0, sizeof(*oparams));
3570 oparams->flags = params->flags;
3571 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3572 oparams->masks[i] = params->masks[i].bits[0];
3573 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3574 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3575 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3576 oparams->info = params->info;
3577 oparams->msbits = params->msbits;
3578 oparams->rate_num = params->rate_num;
3579 oparams->rate_den = params->rate_den;
3580 oparams->fifo_size = params->fifo_size;
3583 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3584 struct snd_pcm_hw_params_old __user * _oparams)
3586 struct snd_pcm_hw_params *params;
3587 struct snd_pcm_hw_params_old *oparams = NULL;
3590 params = kmalloc(sizeof(*params), GFP_KERNEL);
3594 oparams = memdup_user(_oparams, sizeof(*oparams));
3595 if (IS_ERR(oparams)) {
3596 err = PTR_ERR(oparams);
3599 snd_pcm_hw_convert_from_old_params(params, oparams);
3600 err = snd_pcm_hw_refine(substream, params);
3604 err = fixup_unreferenced_params(substream, params);
3608 snd_pcm_hw_convert_to_old_params(oparams, params);
3609 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3618 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3619 struct snd_pcm_hw_params_old __user * _oparams)
3621 struct snd_pcm_hw_params *params;
3622 struct snd_pcm_hw_params_old *oparams = NULL;
3625 params = kmalloc(sizeof(*params), GFP_KERNEL);
3629 oparams = memdup_user(_oparams, sizeof(*oparams));
3630 if (IS_ERR(oparams)) {
3631 err = PTR_ERR(oparams);
3635 snd_pcm_hw_convert_from_old_params(params, oparams);
3636 err = snd_pcm_hw_params(substream, params);
3640 snd_pcm_hw_convert_to_old_params(oparams, params);
3641 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3649 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3652 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3655 unsigned long pgoff,
3656 unsigned long flags)
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;
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;
3669 return (unsigned long)runtime->dma_area + offset;
3673 # define snd_pcm_get_unmapped_area NULL
3680 const struct file_operations snd_pcm_f_ops[2] = {
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_poll,
3689 .unlocked_ioctl = snd_pcm_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,
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_poll,
3703 .unlocked_ioctl = snd_pcm_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,