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 DECLARE_RWSEM(snd_pcm_link_rwsem);
90 void snd_pcm_group_init(struct snd_pcm_group *group)
92 spin_lock_init(&group->lock);
93 mutex_init(&group->mutex);
94 INIT_LIST_HEAD(&group->substreams);
95 refcount_set(&group->refs, 0);
98 /* define group lock helpers */
99 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
100 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
103 mutex_ ## mutex_action(&group->mutex); \
105 spin_ ## action(&group->lock); \
108 DEFINE_PCM_GROUP_LOCK(lock, lock);
109 DEFINE_PCM_GROUP_LOCK(unlock, unlock);
110 DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
111 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
114 * snd_pcm_stream_lock - Lock the PCM stream
115 * @substream: PCM substream
117 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
118 * flag of the given substream. This also takes the global link rw lock
119 * (or rw sem), too, for avoiding the race with linked streams.
121 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
123 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
125 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
128 * snd_pcm_stream_lock - Unlock the PCM stream
129 * @substream: PCM substream
131 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
133 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
135 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
137 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
140 * snd_pcm_stream_lock_irq - Lock the PCM stream
141 * @substream: PCM substream
143 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
144 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
145 * as snd_pcm_stream_lock().
147 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
149 snd_pcm_group_lock_irq(&substream->self_group,
150 substream->pcm->nonatomic);
152 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
155 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
156 * @substream: PCM substream
158 * This is a counter-part of snd_pcm_stream_lock_irq().
160 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
162 snd_pcm_group_unlock_irq(&substream->self_group,
163 substream->pcm->nonatomic);
165 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
167 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
169 unsigned long flags = 0;
170 if (substream->pcm->nonatomic)
171 mutex_lock(&substream->self_group.mutex);
173 spin_lock_irqsave(&substream->self_group.lock, flags);
176 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
179 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
180 * @substream: PCM substream
183 * This is a counter-part of snd_pcm_stream_lock_irqsave().
185 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
188 if (substream->pcm->nonatomic)
189 mutex_unlock(&substream->self_group.mutex);
191 spin_unlock_irqrestore(&substream->self_group.lock, flags);
193 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
195 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
197 struct snd_pcm *pcm = substream->pcm;
198 struct snd_pcm_str *pstr = substream->pstr;
200 memset(info, 0, sizeof(*info));
201 info->card = pcm->card->number;
202 info->device = pcm->device;
203 info->stream = substream->stream;
204 info->subdevice = substream->number;
205 strlcpy(info->id, pcm->id, sizeof(info->id));
206 strlcpy(info->name, pcm->name, sizeof(info->name));
207 info->dev_class = pcm->dev_class;
208 info->dev_subclass = pcm->dev_subclass;
209 info->subdevices_count = pstr->substream_count;
210 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
211 strlcpy(info->subname, substream->name, sizeof(info->subname));
216 int snd_pcm_info_user(struct snd_pcm_substream *substream,
217 struct snd_pcm_info __user * _info)
219 struct snd_pcm_info *info;
222 info = kmalloc(sizeof(*info), GFP_KERNEL);
225 err = snd_pcm_info(substream, info);
227 if (copy_to_user(_info, info, sizeof(*info)))
234 static bool hw_support_mmap(struct snd_pcm_substream *substream)
236 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
238 /* architecture supports dma_mmap_coherent()? */
239 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
240 if (!substream->ops->mmap &&
241 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
247 static int constrain_mask_params(struct snd_pcm_substream *substream,
248 struct snd_pcm_hw_params *params)
250 struct snd_pcm_hw_constraints *constrs =
251 &substream->runtime->hw_constraints;
254 struct snd_mask old_mask;
257 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
258 m = hw_param_mask(params, k);
259 if (snd_mask_empty(m))
262 /* This parameter is not requested to change by a caller. */
263 if (!(params->rmask & (1 << k)))
266 if (trace_hw_mask_param_enabled())
269 changed = snd_mask_refine(m, constrs_mask(constrs, k));
275 /* Set corresponding flag so that the caller gets it. */
276 trace_hw_mask_param(substream, k, 0, &old_mask, m);
277 params->cmask |= 1 << k;
283 static int constrain_interval_params(struct snd_pcm_substream *substream,
284 struct snd_pcm_hw_params *params)
286 struct snd_pcm_hw_constraints *constrs =
287 &substream->runtime->hw_constraints;
288 struct snd_interval *i;
290 struct snd_interval old_interval;
293 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
294 i = hw_param_interval(params, k);
295 if (snd_interval_empty(i))
298 /* This parameter is not requested to change by a caller. */
299 if (!(params->rmask & (1 << k)))
302 if (trace_hw_interval_param_enabled())
305 changed = snd_interval_refine(i, constrs_interval(constrs, k));
311 /* Set corresponding flag so that the caller gets it. */
312 trace_hw_interval_param(substream, k, 0, &old_interval, i);
313 params->cmask |= 1 << k;
319 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
320 struct snd_pcm_hw_params *params)
322 struct snd_pcm_hw_constraints *constrs =
323 &substream->runtime->hw_constraints;
325 unsigned int *rstamps;
326 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
328 struct snd_pcm_hw_rule *r;
330 struct snd_mask old_mask;
331 struct snd_interval old_interval;
333 int changed, err = 0;
336 * Each application of rule has own sequence number.
338 * Each member of 'rstamps' array represents the sequence number of
339 * recent application of corresponding rule.
341 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
346 * Each member of 'vstamps' array represents the sequence number of
347 * recent application of rule in which corresponding parameters were
350 * In initial state, elements corresponding to parameters requested by
351 * a caller is 1. For unrequested parameters, corresponding members
352 * have 0 so that the parameters are never changed anymore.
354 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
355 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357 /* Due to the above design, actual sequence number starts at 2. */
360 /* Apply all rules in order. */
362 for (k = 0; k < constrs->rules_num; k++) {
363 r = &constrs->rules[k];
366 * Check condition bits of this rule. When the rule has
367 * some condition bits, parameter without the bits is
368 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
369 * is an example of the condition bits.
371 if (r->cond && !(r->cond & params->flags))
375 * The 'deps' array includes maximum three dependencies
376 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
377 * member of this array is a sentinel and should be
380 * This rule should be processed in this time when dependent
381 * parameters were changed at former applications of the other
384 for (d = 0; r->deps[d] >= 0; d++) {
385 if (vstamps[r->deps[d]] > rstamps[k])
391 if (trace_hw_mask_param_enabled()) {
392 if (hw_is_mask(r->var))
393 old_mask = *hw_param_mask(params, r->var);
395 if (trace_hw_interval_param_enabled()) {
396 if (hw_is_interval(r->var))
397 old_interval = *hw_param_interval(params, r->var);
400 changed = r->func(params, r);
407 * When the parameter is changed, notify it to the caller
408 * by corresponding returned bit, then preparing for next
411 if (changed && r->var >= 0) {
412 if (hw_is_mask(r->var)) {
413 trace_hw_mask_param(substream, r->var,
415 hw_param_mask(params, r->var));
417 if (hw_is_interval(r->var)) {
418 trace_hw_interval_param(substream, r->var,
419 k + 1, &old_interval,
420 hw_param_interval(params, r->var));
423 params->cmask |= (1 << r->var);
424 vstamps[r->var] = stamp;
428 rstamps[k] = stamp++;
431 /* Iterate to evaluate all rules till no parameters are changed. */
440 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
441 struct snd_pcm_hw_params *params)
443 const struct snd_interval *i;
444 const struct snd_mask *m;
447 if (!params->msbits) {
448 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
449 if (snd_interval_single(i))
450 params->msbits = snd_interval_value(i);
453 if (!params->rate_den) {
454 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
455 if (snd_interval_single(i)) {
456 params->rate_num = snd_interval_value(i);
457 params->rate_den = 1;
461 if (!params->fifo_size) {
462 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
463 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
464 if (snd_mask_single(m) && snd_interval_single(i)) {
465 err = substream->ops->ioctl(substream,
466 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
473 params->info = substream->runtime->hw.info;
474 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
475 SNDRV_PCM_INFO_DRAIN_TRIGGER);
476 if (!hw_support_mmap(substream))
477 params->info &= ~(SNDRV_PCM_INFO_MMAP |
478 SNDRV_PCM_INFO_MMAP_VALID);
484 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
485 struct snd_pcm_hw_params *params)
490 params->fifo_size = 0;
491 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
493 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
494 params->rate_num = 0;
495 params->rate_den = 0;
498 err = constrain_mask_params(substream, params);
502 err = constrain_interval_params(substream, params);
506 err = constrain_params_by_rules(substream, params);
514 EXPORT_SYMBOL(snd_pcm_hw_refine);
516 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
517 struct snd_pcm_hw_params __user * _params)
519 struct snd_pcm_hw_params *params;
522 params = memdup_user(_params, sizeof(*params));
524 return PTR_ERR(params);
526 err = snd_pcm_hw_refine(substream, params);
530 err = fixup_unreferenced_params(substream, params);
534 if (copy_to_user(_params, params, sizeof(*params)))
541 static int period_to_usecs(struct snd_pcm_runtime *runtime)
546 return -1; /* invalid */
548 /* take 75% of period time as the deadline */
549 usecs = (750000 / runtime->rate) * runtime->period_size;
550 usecs += ((750000 % runtime->rate) * runtime->period_size) /
556 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
558 snd_pcm_stream_lock_irq(substream);
559 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
560 substream->runtime->status->state = state;
561 snd_pcm_stream_unlock_irq(substream);
564 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
567 #ifdef CONFIG_SND_PCM_TIMER
568 if (substream->timer)
569 snd_timer_notify(substream->timer, event,
570 &substream->runtime->trigger_tstamp);
575 * snd_pcm_hw_param_choose - choose a configuration defined by @params
577 * @params: the hw_params instance
579 * Choose one configuration from configuration space defined by @params.
580 * The configuration chosen is that obtained fixing in this order:
581 * first access, first format, first subformat, min channels,
582 * min rate, min period time, max buffer size, min tick time
584 * Return: Zero if successful, or a negative error code on failure.
586 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
587 struct snd_pcm_hw_params *params)
589 static const int vars[] = {
590 SNDRV_PCM_HW_PARAM_ACCESS,
591 SNDRV_PCM_HW_PARAM_FORMAT,
592 SNDRV_PCM_HW_PARAM_SUBFORMAT,
593 SNDRV_PCM_HW_PARAM_CHANNELS,
594 SNDRV_PCM_HW_PARAM_RATE,
595 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
596 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
597 SNDRV_PCM_HW_PARAM_TICK_TIME,
601 struct snd_mask old_mask;
602 struct snd_interval old_interval;
605 for (v = vars; *v != -1; v++) {
606 /* Keep old parameter to trace. */
607 if (trace_hw_mask_param_enabled()) {
609 old_mask = *hw_param_mask(params, *v);
611 if (trace_hw_interval_param_enabled()) {
612 if (hw_is_interval(*v))
613 old_interval = *hw_param_interval(params, *v);
615 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
616 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
618 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
624 /* Trace the changed parameter. */
625 if (hw_is_mask(*v)) {
626 trace_hw_mask_param(pcm, *v, 0, &old_mask,
627 hw_param_mask(params, *v));
629 if (hw_is_interval(*v)) {
630 trace_hw_interval_param(pcm, *v, 0, &old_interval,
631 hw_param_interval(params, *v));
638 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
639 struct snd_pcm_hw_params *params)
641 struct snd_pcm_runtime *runtime;
644 snd_pcm_uframes_t frames;
646 if (PCM_RUNTIME_CHECK(substream))
648 runtime = substream->runtime;
649 snd_pcm_stream_lock_irq(substream);
650 switch (runtime->status->state) {
651 case SNDRV_PCM_STATE_OPEN:
652 case SNDRV_PCM_STATE_SETUP:
653 case SNDRV_PCM_STATE_PREPARED:
656 snd_pcm_stream_unlock_irq(substream);
659 snd_pcm_stream_unlock_irq(substream);
660 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
661 if (!substream->oss.oss)
663 if (atomic_read(&substream->mmap_count))
667 err = snd_pcm_hw_refine(substream, params);
671 err = snd_pcm_hw_params_choose(substream, params);
675 err = fixup_unreferenced_params(substream, params);
679 if (substream->ops->hw_params != NULL) {
680 err = substream->ops->hw_params(substream, params);
685 runtime->access = params_access(params);
686 runtime->format = params_format(params);
687 runtime->subformat = params_subformat(params);
688 runtime->channels = params_channels(params);
689 runtime->rate = params_rate(params);
690 runtime->period_size = params_period_size(params);
691 runtime->periods = params_periods(params);
692 runtime->buffer_size = params_buffer_size(params);
693 runtime->info = params->info;
694 runtime->rate_num = params->rate_num;
695 runtime->rate_den = params->rate_den;
696 runtime->no_period_wakeup =
697 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
698 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
700 bits = snd_pcm_format_physical_width(runtime->format);
701 runtime->sample_bits = bits;
702 bits *= runtime->channels;
703 runtime->frame_bits = bits;
705 while (bits % 8 != 0) {
709 runtime->byte_align = bits / 8;
710 runtime->min_align = frames;
712 /* Default sw params */
713 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
714 runtime->period_step = 1;
715 runtime->control->avail_min = runtime->period_size;
716 runtime->start_threshold = 1;
717 runtime->stop_threshold = runtime->buffer_size;
718 runtime->silence_threshold = 0;
719 runtime->silence_size = 0;
720 runtime->boundary = runtime->buffer_size;
721 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
722 runtime->boundary *= 2;
724 snd_pcm_timer_resolution_change(substream);
725 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
727 if (pm_qos_request_active(&substream->latency_pm_qos_req))
728 pm_qos_remove_request(&substream->latency_pm_qos_req);
729 if ((usecs = period_to_usecs(runtime)) >= 0)
730 pm_qos_add_request(&substream->latency_pm_qos_req,
731 PM_QOS_CPU_DMA_LATENCY, usecs);
734 /* hardware might be unusable from this time,
735 so we force application to retry to set
736 the correct hardware parameter settings */
737 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
738 if (substream->ops->hw_free != NULL)
739 substream->ops->hw_free(substream);
743 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
744 struct snd_pcm_hw_params __user * _params)
746 struct snd_pcm_hw_params *params;
749 params = memdup_user(_params, sizeof(*params));
751 return PTR_ERR(params);
753 err = snd_pcm_hw_params(substream, params);
757 if (copy_to_user(_params, params, sizeof(*params)))
764 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
766 struct snd_pcm_runtime *runtime;
769 if (PCM_RUNTIME_CHECK(substream))
771 runtime = substream->runtime;
772 snd_pcm_stream_lock_irq(substream);
773 switch (runtime->status->state) {
774 case SNDRV_PCM_STATE_SETUP:
775 case SNDRV_PCM_STATE_PREPARED:
778 snd_pcm_stream_unlock_irq(substream);
781 snd_pcm_stream_unlock_irq(substream);
782 if (atomic_read(&substream->mmap_count))
784 if (substream->ops->hw_free)
785 result = substream->ops->hw_free(substream);
786 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
787 pm_qos_remove_request(&substream->latency_pm_qos_req);
791 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
792 struct snd_pcm_sw_params *params)
794 struct snd_pcm_runtime *runtime;
797 if (PCM_RUNTIME_CHECK(substream))
799 runtime = substream->runtime;
800 snd_pcm_stream_lock_irq(substream);
801 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
802 snd_pcm_stream_unlock_irq(substream);
805 snd_pcm_stream_unlock_irq(substream);
807 if (params->tstamp_mode < 0 ||
808 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
810 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
811 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
813 if (params->avail_min == 0)
815 if (params->silence_size >= runtime->boundary) {
816 if (params->silence_threshold != 0)
819 if (params->silence_size > params->silence_threshold)
821 if (params->silence_threshold > runtime->buffer_size)
825 snd_pcm_stream_lock_irq(substream);
826 runtime->tstamp_mode = params->tstamp_mode;
827 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
828 runtime->tstamp_type = params->tstamp_type;
829 runtime->period_step = params->period_step;
830 runtime->control->avail_min = params->avail_min;
831 runtime->start_threshold = params->start_threshold;
832 runtime->stop_threshold = params->stop_threshold;
833 runtime->silence_threshold = params->silence_threshold;
834 runtime->silence_size = params->silence_size;
835 params->boundary = runtime->boundary;
836 if (snd_pcm_running(substream)) {
837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
838 runtime->silence_size > 0)
839 snd_pcm_playback_silence(substream, ULONG_MAX);
840 err = snd_pcm_update_state(substream, runtime);
842 snd_pcm_stream_unlock_irq(substream);
846 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
847 struct snd_pcm_sw_params __user * _params)
849 struct snd_pcm_sw_params params;
851 if (copy_from_user(¶ms, _params, sizeof(params)))
853 err = snd_pcm_sw_params(substream, ¶ms);
854 if (copy_to_user(_params, ¶ms, sizeof(params)))
859 static inline snd_pcm_uframes_t
860 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
862 snd_pcm_uframes_t delay;
864 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
865 delay = snd_pcm_playback_hw_avail(substream->runtime);
867 delay = snd_pcm_capture_avail(substream->runtime);
868 return delay + substream->runtime->delay;
871 int snd_pcm_status(struct snd_pcm_substream *substream,
872 struct snd_pcm_status *status)
874 struct snd_pcm_runtime *runtime = substream->runtime;
876 snd_pcm_stream_lock_irq(substream);
878 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
879 &runtime->audio_tstamp_config);
881 /* backwards compatible behavior */
882 if (runtime->audio_tstamp_config.type_requested ==
883 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
884 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
885 runtime->audio_tstamp_config.type_requested =
886 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
888 runtime->audio_tstamp_config.type_requested =
889 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
890 runtime->audio_tstamp_report.valid = 0;
892 runtime->audio_tstamp_report.valid = 1;
894 status->state = runtime->status->state;
895 status->suspended_state = runtime->status->suspended_state;
896 if (status->state == SNDRV_PCM_STATE_OPEN)
898 status->trigger_tstamp = runtime->trigger_tstamp;
899 if (snd_pcm_running(substream)) {
900 snd_pcm_update_hw_ptr(substream);
901 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
902 status->tstamp = runtime->status->tstamp;
903 status->driver_tstamp = runtime->driver_tstamp;
904 status->audio_tstamp =
905 runtime->status->audio_tstamp;
906 if (runtime->audio_tstamp_report.valid == 1)
907 /* backwards compatibility, no report provided in COMPAT mode */
908 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
909 &status->audio_tstamp_accuracy,
910 &runtime->audio_tstamp_report);
915 /* get tstamp only in fallback mode and only if enabled */
916 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
917 snd_pcm_gettime(runtime, &status->tstamp);
920 status->appl_ptr = runtime->control->appl_ptr;
921 status->hw_ptr = runtime->status->hw_ptr;
922 status->avail = snd_pcm_avail(substream);
923 status->delay = snd_pcm_running(substream) ?
924 snd_pcm_calc_delay(substream) : 0;
925 status->avail_max = runtime->avail_max;
926 status->overrange = runtime->overrange;
927 runtime->avail_max = 0;
928 runtime->overrange = 0;
930 snd_pcm_stream_unlock_irq(substream);
934 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
935 struct snd_pcm_status __user * _status,
938 struct snd_pcm_status status;
941 memset(&status, 0, sizeof(status));
943 * with extension, parameters are read/write,
944 * get audio_tstamp_data from user,
945 * ignore rest of status structure
947 if (ext && get_user(status.audio_tstamp_data,
948 (u32 __user *)(&_status->audio_tstamp_data)))
950 res = snd_pcm_status(substream, &status);
953 if (copy_to_user(_status, &status, sizeof(status)))
958 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
959 struct snd_pcm_channel_info * info)
961 struct snd_pcm_runtime *runtime;
962 unsigned int channel;
964 channel = info->channel;
965 runtime = substream->runtime;
966 snd_pcm_stream_lock_irq(substream);
967 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
968 snd_pcm_stream_unlock_irq(substream);
971 snd_pcm_stream_unlock_irq(substream);
972 if (channel >= runtime->channels)
974 memset(info, 0, sizeof(*info));
975 info->channel = channel;
976 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
979 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
980 struct snd_pcm_channel_info __user * _info)
982 struct snd_pcm_channel_info info;
985 if (copy_from_user(&info, _info, sizeof(info)))
987 res = snd_pcm_channel_info(substream, &info);
990 if (copy_to_user(_info, &info, sizeof(info)))
995 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
997 struct snd_pcm_runtime *runtime = substream->runtime;
998 if (runtime->trigger_master == NULL)
1000 if (runtime->trigger_master == substream) {
1001 if (!runtime->trigger_tstamp_latched)
1002 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1004 snd_pcm_trigger_tstamp(runtime->trigger_master);
1005 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1007 runtime->trigger_master = NULL;
1011 int (*pre_action)(struct snd_pcm_substream *substream, int state);
1012 int (*do_action)(struct snd_pcm_substream *substream, int state);
1013 void (*undo_action)(struct snd_pcm_substream *substream, int state);
1014 void (*post_action)(struct snd_pcm_substream *substream, int state);
1018 * this functions is core for handling of linked stream
1019 * Note: the stream state might be changed also on failure
1020 * Note2: call with calling stream lock + link lock
1022 static int snd_pcm_action_group(const struct action_ops *ops,
1023 struct snd_pcm_substream *substream,
1024 int state, int do_lock)
1026 struct snd_pcm_substream *s = NULL;
1027 struct snd_pcm_substream *s1;
1028 int res = 0, depth = 1;
1030 snd_pcm_group_for_each_entry(s, substream) {
1031 if (do_lock && s != substream) {
1032 if (s->pcm->nonatomic)
1033 mutex_lock_nested(&s->self_group.mutex, depth);
1035 spin_lock_nested(&s->self_group.lock, depth);
1038 res = ops->pre_action(s, state);
1042 snd_pcm_group_for_each_entry(s, substream) {
1043 res = ops->do_action(s, state);
1045 if (ops->undo_action) {
1046 snd_pcm_group_for_each_entry(s1, substream) {
1047 if (s1 == s) /* failed stream */
1049 ops->undo_action(s1, state);
1052 s = NULL; /* unlock all */
1056 snd_pcm_group_for_each_entry(s, substream) {
1057 ops->post_action(s, state);
1061 /* unlock streams */
1062 snd_pcm_group_for_each_entry(s1, substream) {
1063 if (s1 != substream) {
1064 if (s1->pcm->nonatomic)
1065 mutex_unlock(&s1->self_group.mutex);
1067 spin_unlock(&s1->self_group.lock);
1069 if (s1 == s) /* end */
1077 * Note: call with stream lock
1079 static int snd_pcm_action_single(const struct action_ops *ops,
1080 struct snd_pcm_substream *substream,
1085 res = ops->pre_action(substream, state);
1088 res = ops->do_action(substream, state);
1090 ops->post_action(substream, state);
1091 else if (ops->undo_action)
1092 ops->undo_action(substream, state);
1096 static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1097 struct snd_pcm_group *new_group)
1099 substream->group = new_group;
1100 list_move(&substream->link_list, &new_group->substreams);
1104 * Unref and unlock the group, but keep the stream lock;
1105 * when the group becomes empty and no longer referred, destroy itself
1107 static void snd_pcm_group_unref(struct snd_pcm_group *group,
1108 struct snd_pcm_substream *substream)
1114 do_free = refcount_dec_and_test(&group->refs) &&
1115 list_empty(&group->substreams);
1116 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1122 * Lock the group inside a stream lock and reference it;
1123 * return the locked group object, or NULL if not linked
1125 static struct snd_pcm_group *
1126 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1128 bool nonatomic = substream->pcm->nonatomic;
1129 struct snd_pcm_group *group;
1133 if (!snd_pcm_stream_linked(substream))
1135 group = substream->group;
1136 /* block freeing the group object */
1137 refcount_inc(&group->refs);
1139 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1140 spin_trylock(&group->lock);
1144 /* re-lock for avoiding ABBA deadlock */
1145 snd_pcm_stream_unlock(substream);
1146 snd_pcm_group_lock(group, nonatomic);
1147 snd_pcm_stream_lock(substream);
1149 /* check the group again; the above opens a small race window */
1150 if (substream->group == group)
1152 /* group changed, try again */
1153 snd_pcm_group_unref(group, substream);
1159 * Note: call with stream lock
1161 static int snd_pcm_action(const struct action_ops *ops,
1162 struct snd_pcm_substream *substream,
1165 struct snd_pcm_group *group;
1168 group = snd_pcm_stream_group_ref(substream);
1170 res = snd_pcm_action_group(ops, substream, state, 1);
1172 res = snd_pcm_action_single(ops, substream, state);
1173 snd_pcm_group_unref(group, substream);
1178 * Note: don't use any locks before
1180 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1181 struct snd_pcm_substream *substream,
1186 snd_pcm_stream_lock_irq(substream);
1187 res = snd_pcm_action(ops, substream, state);
1188 snd_pcm_stream_unlock_irq(substream);
1194 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1195 struct snd_pcm_substream *substream,
1200 /* Guarantee the group members won't change during non-atomic action */
1201 down_read(&snd_pcm_link_rwsem);
1202 if (snd_pcm_stream_linked(substream))
1203 res = snd_pcm_action_group(ops, substream, state, 0);
1205 res = snd_pcm_action_single(ops, substream, state);
1206 up_read(&snd_pcm_link_rwsem);
1213 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1215 struct snd_pcm_runtime *runtime = substream->runtime;
1216 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1219 !snd_pcm_playback_data(substream))
1221 runtime->trigger_tstamp_latched = false;
1222 runtime->trigger_master = substream;
1226 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1228 if (substream->runtime->trigger_master != substream)
1230 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1233 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1235 if (substream->runtime->trigger_master == substream)
1236 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1239 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1241 struct snd_pcm_runtime *runtime = substream->runtime;
1242 snd_pcm_trigger_tstamp(substream);
1243 runtime->hw_ptr_jiffies = jiffies;
1244 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1246 runtime->status->state = state;
1247 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1248 runtime->silence_size > 0)
1249 snd_pcm_playback_silence(substream, ULONG_MAX);
1250 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1253 static const struct action_ops snd_pcm_action_start = {
1254 .pre_action = snd_pcm_pre_start,
1255 .do_action = snd_pcm_do_start,
1256 .undo_action = snd_pcm_undo_start,
1257 .post_action = snd_pcm_post_start
1261 * snd_pcm_start - start all linked streams
1262 * @substream: the PCM substream instance
1264 * Return: Zero if successful, or a negative error code.
1265 * The stream lock must be acquired before calling this function.
1267 int snd_pcm_start(struct snd_pcm_substream *substream)
1269 return snd_pcm_action(&snd_pcm_action_start, substream,
1270 SNDRV_PCM_STATE_RUNNING);
1273 /* take the stream lock and start the streams */
1274 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1276 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1277 SNDRV_PCM_STATE_RUNNING);
1283 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1285 struct snd_pcm_runtime *runtime = substream->runtime;
1286 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1288 runtime->trigger_master = substream;
1292 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1294 if (substream->runtime->trigger_master == substream &&
1295 snd_pcm_running(substream))
1296 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1297 return 0; /* unconditonally stop all substreams */
1300 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1302 struct snd_pcm_runtime *runtime = substream->runtime;
1303 if (runtime->status->state != state) {
1304 snd_pcm_trigger_tstamp(substream);
1305 runtime->status->state = state;
1306 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1308 wake_up(&runtime->sleep);
1309 wake_up(&runtime->tsleep);
1312 static const struct action_ops snd_pcm_action_stop = {
1313 .pre_action = snd_pcm_pre_stop,
1314 .do_action = snd_pcm_do_stop,
1315 .post_action = snd_pcm_post_stop
1319 * snd_pcm_stop - try to stop all running streams in the substream group
1320 * @substream: the PCM substream instance
1321 * @state: PCM state after stopping the stream
1323 * The state of each stream is then changed to the given state unconditionally.
1325 * Return: Zero if successful, or a negative error code.
1327 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1329 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1331 EXPORT_SYMBOL(snd_pcm_stop);
1334 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1335 * @substream: the PCM substream
1337 * After stopping, the state is changed to SETUP.
1338 * Unlike snd_pcm_stop(), this affects only the given stream.
1340 * Return: Zero if succesful, or a negative error code.
1342 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1344 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1345 SNDRV_PCM_STATE_SETUP);
1349 * snd_pcm_stop_xrun - stop the running streams as XRUN
1350 * @substream: the PCM substream instance
1352 * This stops the given running substream (and all linked substreams) as XRUN.
1353 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1355 * Return: Zero if successful, or a negative error code.
1357 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1359 unsigned long flags;
1361 snd_pcm_stream_lock_irqsave(substream, flags);
1362 if (substream->runtime && snd_pcm_running(substream))
1363 __snd_pcm_xrun(substream);
1364 snd_pcm_stream_unlock_irqrestore(substream, flags);
1367 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1372 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1374 struct snd_pcm_runtime *runtime = substream->runtime;
1375 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1378 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1380 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1382 runtime->trigger_master = substream;
1386 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1388 if (substream->runtime->trigger_master != substream)
1390 /* some drivers might use hw_ptr to recover from the pause -
1391 update the hw_ptr now */
1393 snd_pcm_update_hw_ptr(substream);
1394 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1395 * a delta between the current jiffies, this gives a large enough
1396 * delta, effectively to skip the check once.
1398 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1399 return substream->ops->trigger(substream,
1400 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1401 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1404 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1406 if (substream->runtime->trigger_master == substream)
1407 substream->ops->trigger(substream,
1408 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1409 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1412 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1414 struct snd_pcm_runtime *runtime = substream->runtime;
1415 snd_pcm_trigger_tstamp(substream);
1417 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1418 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1419 wake_up(&runtime->sleep);
1420 wake_up(&runtime->tsleep);
1422 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1423 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1427 static const struct action_ops snd_pcm_action_pause = {
1428 .pre_action = snd_pcm_pre_pause,
1429 .do_action = snd_pcm_do_pause,
1430 .undo_action = snd_pcm_undo_pause,
1431 .post_action = snd_pcm_post_pause
1435 * Push/release the pause for all linked streams.
1437 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1439 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1445 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1447 struct snd_pcm_runtime *runtime = substream->runtime;
1448 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1450 runtime->trigger_master = substream;
1454 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1456 struct snd_pcm_runtime *runtime = substream->runtime;
1457 if (runtime->trigger_master != substream)
1459 if (! snd_pcm_running(substream))
1461 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1462 return 0; /* suspend unconditionally */
1465 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1467 struct snd_pcm_runtime *runtime = substream->runtime;
1468 snd_pcm_trigger_tstamp(substream);
1469 runtime->status->suspended_state = runtime->status->state;
1470 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1471 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1472 wake_up(&runtime->sleep);
1473 wake_up(&runtime->tsleep);
1476 static const struct action_ops snd_pcm_action_suspend = {
1477 .pre_action = snd_pcm_pre_suspend,
1478 .do_action = snd_pcm_do_suspend,
1479 .post_action = snd_pcm_post_suspend
1483 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1484 * @substream: the PCM substream
1486 * After this call, all streams are changed to SUSPENDED state.
1488 * Return: Zero if successful, or a negative error code.
1490 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1493 unsigned long flags;
1495 snd_pcm_stream_lock_irqsave(substream, flags);
1496 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1497 snd_pcm_stream_unlock_irqrestore(substream, flags);
1502 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1503 * @pcm: the PCM instance
1505 * After this call, all streams are changed to SUSPENDED state.
1507 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1509 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1511 struct snd_pcm_substream *substream;
1512 int stream, err = 0;
1517 for (stream = 0; stream < 2; stream++) {
1518 for (substream = pcm->streams[stream].substream;
1519 substream; substream = substream->next) {
1520 /* FIXME: the open/close code should lock this as well */
1521 if (substream->runtime == NULL)
1525 * Skip BE dai link PCM's that are internal and may
1526 * not have their substream ops set.
1528 if (!substream->ops)
1531 err = snd_pcm_suspend(substream);
1532 if (err < 0 && err != -EBUSY)
1538 EXPORT_SYMBOL(snd_pcm_suspend_all);
1542 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1544 struct snd_pcm_runtime *runtime = substream->runtime;
1545 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1547 runtime->trigger_master = substream;
1551 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1553 struct snd_pcm_runtime *runtime = substream->runtime;
1554 if (runtime->trigger_master != substream)
1556 /* DMA not running previously? */
1557 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1558 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1559 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1561 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1564 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1566 if (substream->runtime->trigger_master == substream &&
1567 snd_pcm_running(substream))
1568 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1571 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1573 struct snd_pcm_runtime *runtime = substream->runtime;
1574 snd_pcm_trigger_tstamp(substream);
1575 runtime->status->state = runtime->status->suspended_state;
1576 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1579 static const struct action_ops snd_pcm_action_resume = {
1580 .pre_action = snd_pcm_pre_resume,
1581 .do_action = snd_pcm_do_resume,
1582 .undo_action = snd_pcm_undo_resume,
1583 .post_action = snd_pcm_post_resume
1586 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1588 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1593 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1598 #endif /* CONFIG_PM */
1603 * Change the RUNNING stream(s) to XRUN state.
1605 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1607 struct snd_pcm_runtime *runtime = substream->runtime;
1610 snd_pcm_stream_lock_irq(substream);
1611 switch (runtime->status->state) {
1612 case SNDRV_PCM_STATE_XRUN:
1613 result = 0; /* already there */
1615 case SNDRV_PCM_STATE_RUNNING:
1616 __snd_pcm_xrun(substream);
1622 snd_pcm_stream_unlock_irq(substream);
1629 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1631 struct snd_pcm_runtime *runtime = substream->runtime;
1632 switch (runtime->status->state) {
1633 case SNDRV_PCM_STATE_RUNNING:
1634 case SNDRV_PCM_STATE_PREPARED:
1635 case SNDRV_PCM_STATE_PAUSED:
1636 case SNDRV_PCM_STATE_SUSPENDED:
1643 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1645 struct snd_pcm_runtime *runtime = substream->runtime;
1646 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1649 runtime->hw_ptr_base = 0;
1650 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1651 runtime->status->hw_ptr % runtime->period_size;
1652 runtime->silence_start = runtime->status->hw_ptr;
1653 runtime->silence_filled = 0;
1657 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1659 struct snd_pcm_runtime *runtime = substream->runtime;
1660 runtime->control->appl_ptr = runtime->status->hw_ptr;
1661 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1662 runtime->silence_size > 0)
1663 snd_pcm_playback_silence(substream, ULONG_MAX);
1666 static const struct action_ops snd_pcm_action_reset = {
1667 .pre_action = snd_pcm_pre_reset,
1668 .do_action = snd_pcm_do_reset,
1669 .post_action = snd_pcm_post_reset
1672 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1674 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1680 /* we use the second argument for updating f_flags */
1681 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1684 struct snd_pcm_runtime *runtime = substream->runtime;
1685 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1686 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1688 if (snd_pcm_running(substream))
1690 substream->f_flags = f_flags;
1694 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1697 err = substream->ops->prepare(substream);
1700 return snd_pcm_do_reset(substream, 0);
1703 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1705 struct snd_pcm_runtime *runtime = substream->runtime;
1706 runtime->control->appl_ptr = runtime->status->hw_ptr;
1707 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1710 static const struct action_ops snd_pcm_action_prepare = {
1711 .pre_action = snd_pcm_pre_prepare,
1712 .do_action = snd_pcm_do_prepare,
1713 .post_action = snd_pcm_post_prepare
1717 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1718 * @substream: the PCM substream instance
1719 * @file: file to refer f_flags
1721 * Return: Zero if successful, or a negative error code.
1723 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1729 f_flags = file->f_flags;
1731 f_flags = substream->f_flags;
1733 snd_pcm_stream_lock_irq(substream);
1734 switch (substream->runtime->status->state) {
1735 case SNDRV_PCM_STATE_PAUSED:
1736 snd_pcm_pause(substream, 0);
1738 case SNDRV_PCM_STATE_SUSPENDED:
1739 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1742 snd_pcm_stream_unlock_irq(substream);
1744 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1745 substream, f_flags);
1752 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1754 struct snd_pcm_runtime *runtime = substream->runtime;
1755 switch (runtime->status->state) {
1756 case SNDRV_PCM_STATE_OPEN:
1757 case SNDRV_PCM_STATE_DISCONNECTED:
1758 case SNDRV_PCM_STATE_SUSPENDED:
1761 runtime->trigger_master = substream;
1765 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1767 struct snd_pcm_runtime *runtime = substream->runtime;
1768 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1769 switch (runtime->status->state) {
1770 case SNDRV_PCM_STATE_PREPARED:
1771 /* start playback stream if possible */
1772 if (! snd_pcm_playback_empty(substream)) {
1773 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1774 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1776 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1779 case SNDRV_PCM_STATE_RUNNING:
1780 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1782 case SNDRV_PCM_STATE_XRUN:
1783 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1789 /* stop running stream */
1790 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1791 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1792 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1793 snd_pcm_do_stop(substream, new_state);
1794 snd_pcm_post_stop(substream, new_state);
1798 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1799 runtime->trigger_master == substream &&
1800 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1801 return substream->ops->trigger(substream,
1802 SNDRV_PCM_TRIGGER_DRAIN);
1807 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1811 static const struct action_ops snd_pcm_action_drain_init = {
1812 .pre_action = snd_pcm_pre_drain_init,
1813 .do_action = snd_pcm_do_drain_init,
1814 .post_action = snd_pcm_post_drain_init
1818 * Drain the stream(s).
1819 * When the substream is linked, sync until the draining of all playback streams
1821 * After this call, all streams are supposed to be either SETUP or DRAINING
1822 * (capture only) state.
1824 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1827 struct snd_card *card;
1828 struct snd_pcm_runtime *runtime;
1829 struct snd_pcm_substream *s;
1830 struct snd_pcm_group *group;
1831 wait_queue_entry_t wait;
1835 card = substream->pcm->card;
1836 runtime = substream->runtime;
1838 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1842 if (file->f_flags & O_NONBLOCK)
1844 } else if (substream->f_flags & O_NONBLOCK)
1847 snd_pcm_stream_lock_irq(substream);
1849 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1850 snd_pcm_pause(substream, 0);
1852 /* pre-start/stop - all running streams are changed to DRAINING state */
1853 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1856 /* in non-blocking, we don't wait in ioctl but let caller poll */
1864 struct snd_pcm_runtime *to_check;
1865 if (signal_pending(current)) {
1866 result = -ERESTARTSYS;
1869 /* find a substream to drain */
1871 group = snd_pcm_stream_group_ref(substream);
1872 snd_pcm_group_for_each_entry(s, substream) {
1873 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1875 runtime = s->runtime;
1876 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1881 snd_pcm_group_unref(group, substream);
1883 break; /* all drained */
1884 init_waitqueue_entry(&wait, current);
1885 add_wait_queue(&to_check->sleep, &wait);
1886 snd_pcm_stream_unlock_irq(substream);
1887 if (runtime->no_period_wakeup)
1888 tout = MAX_SCHEDULE_TIMEOUT;
1891 if (runtime->rate) {
1892 long t = runtime->period_size * 2 / runtime->rate;
1893 tout = max(t, tout);
1895 tout = msecs_to_jiffies(tout * 1000);
1897 tout = schedule_timeout_interruptible(tout);
1899 snd_pcm_stream_lock_irq(substream);
1900 group = snd_pcm_stream_group_ref(substream);
1901 snd_pcm_group_for_each_entry(s, substream) {
1902 if (s->runtime == to_check) {
1903 remove_wait_queue(&to_check->sleep, &wait);
1907 snd_pcm_group_unref(group, substream);
1909 if (card->shutdown) {
1914 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1917 dev_dbg(substream->pcm->card->dev,
1918 "playback drain error (DMA or IRQ trouble?)\n");
1919 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1927 snd_pcm_stream_unlock_irq(substream);
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);
1966 struct snd_pcm *pcm;
1969 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1971 minor = iminor(inode);
1972 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
1974 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1977 snd_card_unref(pcm->card);
1984 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1987 struct snd_pcm_file *pcm_file;
1988 struct snd_pcm_substream *substream1;
1989 struct snd_pcm_group *group, *target_group;
1990 bool nonatomic = substream->pcm->nonatomic;
1991 struct fd f = fdget(fd);
1995 if (!is_pcm_file(f.file)) {
1999 pcm_file = f.file->private_data;
2000 substream1 = pcm_file->substream;
2001 group = kzalloc(sizeof(*group), GFP_KERNEL);
2006 snd_pcm_group_init(group);
2008 down_write(&snd_pcm_link_rwsem);
2009 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2010 substream->runtime->status->state != substream1->runtime->status->state ||
2011 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2015 if (snd_pcm_stream_linked(substream1)) {
2020 snd_pcm_stream_lock_irq(substream);
2021 if (!snd_pcm_stream_linked(substream)) {
2022 snd_pcm_group_assign(substream, group);
2023 group = NULL; /* assigned, don't free this one below */
2025 target_group = substream->group;
2026 snd_pcm_stream_unlock_irq(substream);
2028 snd_pcm_group_lock_irq(target_group, nonatomic);
2029 snd_pcm_stream_lock(substream1);
2030 snd_pcm_group_assign(substream1, target_group);
2031 snd_pcm_stream_unlock(substream1);
2032 snd_pcm_group_unlock_irq(target_group, nonatomic);
2034 up_write(&snd_pcm_link_rwsem);
2042 static void relink_to_local(struct snd_pcm_substream *substream)
2044 snd_pcm_stream_lock(substream);
2045 snd_pcm_group_assign(substream, &substream->self_group);
2046 snd_pcm_stream_unlock(substream);
2049 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2051 struct snd_pcm_group *group;
2052 bool nonatomic = substream->pcm->nonatomic;
2053 bool do_free = false;
2056 down_write(&snd_pcm_link_rwsem);
2058 if (!snd_pcm_stream_linked(substream)) {
2063 group = substream->group;
2064 snd_pcm_group_lock_irq(group, nonatomic);
2066 relink_to_local(substream);
2068 /* detach the last stream, too */
2069 if (list_is_singular(&group->substreams)) {
2070 relink_to_local(list_first_entry(&group->substreams,
2071 struct snd_pcm_substream,
2073 do_free = !refcount_read(&group->refs);
2076 snd_pcm_group_unlock_irq(group, nonatomic);
2081 up_write(&snd_pcm_link_rwsem);
2088 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2089 struct snd_pcm_hw_rule *rule)
2091 struct snd_interval t;
2092 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2093 hw_param_interval_c(params, rule->deps[1]), &t);
2094 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2097 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2098 struct snd_pcm_hw_rule *rule)
2100 struct snd_interval t;
2101 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2102 hw_param_interval_c(params, rule->deps[1]), &t);
2103 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2106 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2107 struct snd_pcm_hw_rule *rule)
2109 struct snd_interval t;
2110 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2111 hw_param_interval_c(params, rule->deps[1]),
2112 (unsigned long) rule->private, &t);
2113 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2116 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2117 struct snd_pcm_hw_rule *rule)
2119 struct snd_interval t;
2120 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2121 (unsigned long) rule->private,
2122 hw_param_interval_c(params, rule->deps[1]), &t);
2123 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2126 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2127 struct snd_pcm_hw_rule *rule)
2130 const struct snd_interval *i =
2131 hw_param_interval_c(params, rule->deps[0]);
2133 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2135 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2137 if (! snd_mask_test(mask, k))
2139 bits = snd_pcm_format_physical_width(k);
2141 continue; /* ignore invalid formats */
2142 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2143 snd_mask_reset(&m, k);
2145 return snd_mask_refine(mask, &m);
2148 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2149 struct snd_pcm_hw_rule *rule)
2151 struct snd_interval t;
2157 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2159 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2161 bits = snd_pcm_format_physical_width(k);
2163 continue; /* ignore invalid formats */
2164 if (t.min > (unsigned)bits)
2166 if (t.max < (unsigned)bits)
2170 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2173 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2174 #error "Change this table"
2177 static const unsigned int rates[] = {
2178 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2179 48000, 64000, 88200, 96000, 176400, 192000
2182 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2183 .count = ARRAY_SIZE(rates),
2187 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2188 struct snd_pcm_hw_rule *rule)
2190 struct snd_pcm_hardware *hw = rule->private;
2191 return snd_interval_list(hw_param_interval(params, rule->var),
2192 snd_pcm_known_rates.count,
2193 snd_pcm_known_rates.list, hw->rates);
2196 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2197 struct snd_pcm_hw_rule *rule)
2199 struct snd_interval t;
2200 struct snd_pcm_substream *substream = rule->private;
2202 t.max = substream->buffer_bytes_max;
2206 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2209 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2211 struct snd_pcm_runtime *runtime = substream->runtime;
2212 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2215 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2216 snd_mask_any(constrs_mask(constrs, k));
2219 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2220 snd_interval_any(constrs_interval(constrs, k));
2223 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2224 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2225 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2226 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2227 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2229 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2230 snd_pcm_hw_rule_format, NULL,
2231 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2234 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2235 snd_pcm_hw_rule_sample_bits, NULL,
2236 SNDRV_PCM_HW_PARAM_FORMAT,
2237 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2240 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2241 snd_pcm_hw_rule_div, NULL,
2242 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2245 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2246 snd_pcm_hw_rule_mul, NULL,
2247 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2250 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2251 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2252 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2255 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2256 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2257 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2260 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2261 snd_pcm_hw_rule_div, NULL,
2262 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2265 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2266 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2267 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2270 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2271 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2272 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2275 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2276 snd_pcm_hw_rule_div, NULL,
2277 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2280 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2281 snd_pcm_hw_rule_div, NULL,
2282 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2285 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2286 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2287 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2290 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2291 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2292 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2295 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2296 snd_pcm_hw_rule_mul, NULL,
2297 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2300 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2301 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2302 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2305 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2306 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2307 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2310 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2311 snd_pcm_hw_rule_muldivk, (void*) 8,
2312 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2315 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2316 snd_pcm_hw_rule_muldivk, (void*) 8,
2317 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2320 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2321 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2322 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2325 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2326 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2327 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2333 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2335 struct snd_pcm_runtime *runtime = substream->runtime;
2336 struct snd_pcm_hardware *hw = &runtime->hw;
2338 unsigned int mask = 0;
2340 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2341 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2342 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2343 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2344 if (hw_support_mmap(substream)) {
2345 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2346 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2347 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2348 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2349 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2350 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2352 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2356 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2360 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2364 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2365 hw->channels_min, hw->channels_max);
2369 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2370 hw->rate_min, hw->rate_max);
2374 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2375 hw->period_bytes_min, hw->period_bytes_max);
2379 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2380 hw->periods_min, hw->periods_max);
2384 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2385 hw->period_bytes_min, hw->buffer_bytes_max);
2389 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2390 snd_pcm_hw_rule_buffer_bytes_max, substream,
2391 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2396 if (runtime->dma_bytes) {
2397 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2402 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2403 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2404 snd_pcm_hw_rule_rate, hw,
2405 SNDRV_PCM_HW_PARAM_RATE, -1);
2410 /* FIXME: this belong to lowlevel */
2411 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2416 static void pcm_release_private(struct snd_pcm_substream *substream)
2418 if (snd_pcm_stream_linked(substream))
2419 snd_pcm_unlink(substream);
2422 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2424 substream->ref_count--;
2425 if (substream->ref_count > 0)
2428 snd_pcm_drop(substream);
2429 if (substream->hw_opened) {
2430 if (substream->ops->hw_free &&
2431 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2432 substream->ops->hw_free(substream);
2433 substream->ops->close(substream);
2434 substream->hw_opened = 0;
2436 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2437 pm_qos_remove_request(&substream->latency_pm_qos_req);
2438 if (substream->pcm_release) {
2439 substream->pcm_release(substream);
2440 substream->pcm_release = NULL;
2442 snd_pcm_detach_substream(substream);
2444 EXPORT_SYMBOL(snd_pcm_release_substream);
2446 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2448 struct snd_pcm_substream **rsubstream)
2450 struct snd_pcm_substream *substream;
2453 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2456 if (substream->ref_count > 1) {
2457 *rsubstream = substream;
2461 err = snd_pcm_hw_constraints_init(substream);
2463 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2467 if ((err = substream->ops->open(substream)) < 0)
2470 substream->hw_opened = 1;
2472 err = snd_pcm_hw_constraints_complete(substream);
2474 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2478 *rsubstream = substream;
2482 snd_pcm_release_substream(substream);
2485 EXPORT_SYMBOL(snd_pcm_open_substream);
2487 static int snd_pcm_open_file(struct file *file,
2488 struct snd_pcm *pcm,
2491 struct snd_pcm_file *pcm_file;
2492 struct snd_pcm_substream *substream;
2495 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2499 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2500 if (pcm_file == NULL) {
2501 snd_pcm_release_substream(substream);
2504 pcm_file->substream = substream;
2505 if (substream->ref_count == 1)
2506 substream->pcm_release = pcm_release_private;
2507 file->private_data = pcm_file;
2512 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2514 struct snd_pcm *pcm;
2515 int err = nonseekable_open(inode, file);
2518 pcm = snd_lookup_minor_data(iminor(inode),
2519 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2520 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2522 snd_card_unref(pcm->card);
2526 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2528 struct snd_pcm *pcm;
2529 int err = nonseekable_open(inode, file);
2532 pcm = snd_lookup_minor_data(iminor(inode),
2533 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2534 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2536 snd_card_unref(pcm->card);
2540 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2543 wait_queue_entry_t wait;
2549 err = snd_card_file_add(pcm->card, file);
2552 if (!try_module_get(pcm->card->module)) {
2556 init_waitqueue_entry(&wait, current);
2557 add_wait_queue(&pcm->open_wait, &wait);
2558 mutex_lock(&pcm->open_mutex);
2560 err = snd_pcm_open_file(file, pcm, stream);
2563 if (err == -EAGAIN) {
2564 if (file->f_flags & O_NONBLOCK) {
2570 set_current_state(TASK_INTERRUPTIBLE);
2571 mutex_unlock(&pcm->open_mutex);
2573 mutex_lock(&pcm->open_mutex);
2574 if (pcm->card->shutdown) {
2578 if (signal_pending(current)) {
2583 remove_wait_queue(&pcm->open_wait, &wait);
2584 mutex_unlock(&pcm->open_mutex);
2590 module_put(pcm->card->module);
2592 snd_card_file_remove(pcm->card, file);
2597 static int snd_pcm_release(struct inode *inode, struct file *file)
2599 struct snd_pcm *pcm;
2600 struct snd_pcm_substream *substream;
2601 struct snd_pcm_file *pcm_file;
2603 pcm_file = file->private_data;
2604 substream = pcm_file->substream;
2605 if (snd_BUG_ON(!substream))
2607 pcm = substream->pcm;
2608 mutex_lock(&pcm->open_mutex);
2609 snd_pcm_release_substream(substream);
2611 mutex_unlock(&pcm->open_mutex);
2612 wake_up(&pcm->open_wait);
2613 module_put(pcm->card->module);
2614 snd_card_file_remove(pcm->card, file);
2618 /* check and update PCM state; return 0 or a negative error
2619 * call this inside PCM lock
2621 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2623 switch (substream->runtime->status->state) {
2624 case SNDRV_PCM_STATE_DRAINING:
2625 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2628 case SNDRV_PCM_STATE_RUNNING:
2629 return snd_pcm_update_hw_ptr(substream);
2630 case SNDRV_PCM_STATE_PREPARED:
2631 case SNDRV_PCM_STATE_PAUSED:
2633 case SNDRV_PCM_STATE_SUSPENDED:
2635 case SNDRV_PCM_STATE_XRUN:
2642 /* increase the appl_ptr; returns the processed frames or a negative error */
2643 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2644 snd_pcm_uframes_t frames,
2645 snd_pcm_sframes_t avail)
2647 struct snd_pcm_runtime *runtime = substream->runtime;
2648 snd_pcm_sframes_t appl_ptr;
2653 if (frames > (snd_pcm_uframes_t)avail)
2655 appl_ptr = runtime->control->appl_ptr + frames;
2656 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2657 appl_ptr -= runtime->boundary;
2658 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2659 return ret < 0 ? ret : frames;
2662 /* decrease the appl_ptr; returns the processed frames or zero for error */
2663 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2664 snd_pcm_uframes_t frames,
2665 snd_pcm_sframes_t avail)
2667 struct snd_pcm_runtime *runtime = substream->runtime;
2668 snd_pcm_sframes_t appl_ptr;
2673 if (frames > (snd_pcm_uframes_t)avail)
2675 appl_ptr = runtime->control->appl_ptr - frames;
2677 appl_ptr += runtime->boundary;
2678 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2679 /* NOTE: we return zero for errors because PulseAudio gets depressed
2680 * upon receiving an error from rewind ioctl and stops processing
2681 * any longer. Returning zero means that no rewind is done, so
2682 * it's not absolutely wrong to answer like that.
2684 return ret < 0 ? 0 : frames;
2687 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2688 snd_pcm_uframes_t frames)
2690 snd_pcm_sframes_t ret;
2695 snd_pcm_stream_lock_irq(substream);
2696 ret = do_pcm_hwsync(substream);
2698 ret = rewind_appl_ptr(substream, frames,
2699 snd_pcm_hw_avail(substream));
2700 snd_pcm_stream_unlock_irq(substream);
2704 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2705 snd_pcm_uframes_t frames)
2707 snd_pcm_sframes_t ret;
2712 snd_pcm_stream_lock_irq(substream);
2713 ret = do_pcm_hwsync(substream);
2715 ret = forward_appl_ptr(substream, frames,
2716 snd_pcm_avail(substream));
2717 snd_pcm_stream_unlock_irq(substream);
2721 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2725 snd_pcm_stream_lock_irq(substream);
2726 err = do_pcm_hwsync(substream);
2727 snd_pcm_stream_unlock_irq(substream);
2731 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2732 snd_pcm_sframes_t *delay)
2735 snd_pcm_sframes_t n = 0;
2737 snd_pcm_stream_lock_irq(substream);
2738 err = do_pcm_hwsync(substream);
2740 n = snd_pcm_calc_delay(substream);
2741 snd_pcm_stream_unlock_irq(substream);
2747 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2748 struct snd_pcm_sync_ptr __user *_sync_ptr)
2750 struct snd_pcm_runtime *runtime = substream->runtime;
2751 struct snd_pcm_sync_ptr sync_ptr;
2752 volatile struct snd_pcm_mmap_status *status;
2753 volatile struct snd_pcm_mmap_control *control;
2756 memset(&sync_ptr, 0, sizeof(sync_ptr));
2757 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2759 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2761 status = runtime->status;
2762 control = runtime->control;
2763 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2764 err = snd_pcm_hwsync(substream);
2768 snd_pcm_stream_lock_irq(substream);
2769 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2770 err = pcm_lib_apply_appl_ptr(substream,
2771 sync_ptr.c.control.appl_ptr);
2773 snd_pcm_stream_unlock_irq(substream);
2777 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2779 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2780 control->avail_min = sync_ptr.c.control.avail_min;
2782 sync_ptr.c.control.avail_min = control->avail_min;
2783 sync_ptr.s.status.state = status->state;
2784 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2785 sync_ptr.s.status.tstamp = status->tstamp;
2786 sync_ptr.s.status.suspended_state = status->suspended_state;
2787 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2788 snd_pcm_stream_unlock_irq(substream);
2789 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2794 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2796 struct snd_pcm_runtime *runtime = substream->runtime;
2799 if (get_user(arg, _arg))
2801 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2803 runtime->tstamp_type = arg;
2807 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2808 struct snd_xferi __user *_xferi)
2810 struct snd_xferi xferi;
2811 struct snd_pcm_runtime *runtime = substream->runtime;
2812 snd_pcm_sframes_t result;
2814 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2816 if (put_user(0, &_xferi->result))
2818 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2820 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2821 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2823 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2824 __put_user(result, &_xferi->result);
2825 return result < 0 ? result : 0;
2828 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2829 struct snd_xfern __user *_xfern)
2831 struct snd_xfern xfern;
2832 struct snd_pcm_runtime *runtime = substream->runtime;
2834 snd_pcm_sframes_t result;
2836 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2838 if (runtime->channels > 128)
2840 if (put_user(0, &_xfern->result))
2842 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2845 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2847 return PTR_ERR(bufs);
2848 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2849 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2851 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2853 __put_user(result, &_xfern->result);
2854 return result < 0 ? result : 0;
2857 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2858 snd_pcm_uframes_t __user *_frames)
2860 snd_pcm_uframes_t frames;
2861 snd_pcm_sframes_t result;
2863 if (get_user(frames, _frames))
2865 if (put_user(0, _frames))
2867 result = snd_pcm_rewind(substream, frames);
2868 __put_user(result, _frames);
2869 return result < 0 ? result : 0;
2872 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2873 snd_pcm_uframes_t __user *_frames)
2875 snd_pcm_uframes_t frames;
2876 snd_pcm_sframes_t result;
2878 if (get_user(frames, _frames))
2880 if (put_user(0, _frames))
2882 result = snd_pcm_forward(substream, frames);
2883 __put_user(result, _frames);
2884 return result < 0 ? result : 0;
2887 static int snd_pcm_common_ioctl(struct file *file,
2888 struct snd_pcm_substream *substream,
2889 unsigned int cmd, void __user *arg)
2891 struct snd_pcm_file *pcm_file = file->private_data;
2894 if (PCM_RUNTIME_CHECK(substream))
2897 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2902 case SNDRV_PCM_IOCTL_PVERSION:
2903 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2904 case SNDRV_PCM_IOCTL_INFO:
2905 return snd_pcm_info_user(substream, arg);
2906 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2908 case SNDRV_PCM_IOCTL_TTSTAMP:
2909 return snd_pcm_tstamp(substream, arg);
2910 case SNDRV_PCM_IOCTL_USER_PVERSION:
2911 if (get_user(pcm_file->user_pversion,
2912 (unsigned int __user *)arg))
2915 case SNDRV_PCM_IOCTL_HW_REFINE:
2916 return snd_pcm_hw_refine_user(substream, arg);
2917 case SNDRV_PCM_IOCTL_HW_PARAMS:
2918 return snd_pcm_hw_params_user(substream, arg);
2919 case SNDRV_PCM_IOCTL_HW_FREE:
2920 return snd_pcm_hw_free(substream);
2921 case SNDRV_PCM_IOCTL_SW_PARAMS:
2922 return snd_pcm_sw_params_user(substream, arg);
2923 case SNDRV_PCM_IOCTL_STATUS:
2924 return snd_pcm_status_user(substream, arg, false);
2925 case SNDRV_PCM_IOCTL_STATUS_EXT:
2926 return snd_pcm_status_user(substream, arg, true);
2927 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2928 return snd_pcm_channel_info_user(substream, arg);
2929 case SNDRV_PCM_IOCTL_PREPARE:
2930 return snd_pcm_prepare(substream, file);
2931 case SNDRV_PCM_IOCTL_RESET:
2932 return snd_pcm_reset(substream);
2933 case SNDRV_PCM_IOCTL_START:
2934 return snd_pcm_start_lock_irq(substream);
2935 case SNDRV_PCM_IOCTL_LINK:
2936 return snd_pcm_link(substream, (int)(unsigned long) arg);
2937 case SNDRV_PCM_IOCTL_UNLINK:
2938 return snd_pcm_unlink(substream);
2939 case SNDRV_PCM_IOCTL_RESUME:
2940 return snd_pcm_resume(substream);
2941 case SNDRV_PCM_IOCTL_XRUN:
2942 return snd_pcm_xrun(substream);
2943 case SNDRV_PCM_IOCTL_HWSYNC:
2944 return snd_pcm_hwsync(substream);
2945 case SNDRV_PCM_IOCTL_DELAY:
2947 snd_pcm_sframes_t delay;
2948 snd_pcm_sframes_t __user *res = arg;
2951 err = snd_pcm_delay(substream, &delay);
2954 if (put_user(delay, res))
2958 case SNDRV_PCM_IOCTL_SYNC_PTR:
2959 return snd_pcm_sync_ptr(substream, arg);
2960 #ifdef CONFIG_SND_SUPPORT_OLD_API
2961 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2962 return snd_pcm_hw_refine_old_user(substream, arg);
2963 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2964 return snd_pcm_hw_params_old_user(substream, arg);
2966 case SNDRV_PCM_IOCTL_DRAIN:
2967 return snd_pcm_drain(substream, file);
2968 case SNDRV_PCM_IOCTL_DROP:
2969 return snd_pcm_drop(substream);
2970 case SNDRV_PCM_IOCTL_PAUSE:
2971 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2973 (int)(unsigned long)arg);
2974 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2975 case SNDRV_PCM_IOCTL_READI_FRAMES:
2976 return snd_pcm_xferi_frames_ioctl(substream, arg);
2977 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2978 case SNDRV_PCM_IOCTL_READN_FRAMES:
2979 return snd_pcm_xfern_frames_ioctl(substream, arg);
2980 case SNDRV_PCM_IOCTL_REWIND:
2981 return snd_pcm_rewind_ioctl(substream, arg);
2982 case SNDRV_PCM_IOCTL_FORWARD:
2983 return snd_pcm_forward_ioctl(substream, arg);
2985 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2989 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2992 struct snd_pcm_file *pcm_file;
2994 pcm_file = file->private_data;
2996 if (((cmd >> 8) & 0xff) != 'A')
2999 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3000 (void __user *)arg);
3004 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3005 * @substream: PCM substream
3007 * @arg: IOCTL argument
3009 * The function is provided primarily for OSS layer and USB gadget drivers,
3010 * and it allows only the limited set of ioctls (hw_params, sw_params,
3011 * prepare, start, drain, drop, forward).
3013 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3014 unsigned int cmd, void *arg)
3016 snd_pcm_uframes_t *frames = arg;
3017 snd_pcm_sframes_t result;
3020 case SNDRV_PCM_IOCTL_FORWARD:
3022 /* provided only for OSS; capture-only and no value returned */
3023 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3025 result = snd_pcm_forward(substream, *frames);
3026 return result < 0 ? result : 0;
3028 case SNDRV_PCM_IOCTL_HW_PARAMS:
3029 return snd_pcm_hw_params(substream, arg);
3030 case SNDRV_PCM_IOCTL_SW_PARAMS:
3031 return snd_pcm_sw_params(substream, arg);
3032 case SNDRV_PCM_IOCTL_PREPARE:
3033 return snd_pcm_prepare(substream, NULL);
3034 case SNDRV_PCM_IOCTL_START:
3035 return snd_pcm_start_lock_irq(substream);
3036 case SNDRV_PCM_IOCTL_DRAIN:
3037 return snd_pcm_drain(substream, NULL);
3038 case SNDRV_PCM_IOCTL_DROP:
3039 return snd_pcm_drop(substream);
3040 case SNDRV_PCM_IOCTL_DELAY:
3041 return snd_pcm_delay(substream, frames);
3046 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3048 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3051 struct snd_pcm_file *pcm_file;
3052 struct snd_pcm_substream *substream;
3053 struct snd_pcm_runtime *runtime;
3054 snd_pcm_sframes_t result;
3056 pcm_file = file->private_data;
3057 substream = pcm_file->substream;
3058 if (PCM_RUNTIME_CHECK(substream))
3060 runtime = substream->runtime;
3061 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3063 if (!frame_aligned(runtime, count))
3065 count = bytes_to_frames(runtime, count);
3066 result = snd_pcm_lib_read(substream, buf, count);
3068 result = frames_to_bytes(runtime, result);
3072 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3073 size_t count, loff_t * offset)
3075 struct snd_pcm_file *pcm_file;
3076 struct snd_pcm_substream *substream;
3077 struct snd_pcm_runtime *runtime;
3078 snd_pcm_sframes_t result;
3080 pcm_file = file->private_data;
3081 substream = pcm_file->substream;
3082 if (PCM_RUNTIME_CHECK(substream))
3084 runtime = substream->runtime;
3085 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3087 if (!frame_aligned(runtime, count))
3089 count = bytes_to_frames(runtime, count);
3090 result = snd_pcm_lib_write(substream, buf, count);
3092 result = frames_to_bytes(runtime, result);
3096 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3098 struct snd_pcm_file *pcm_file;
3099 struct snd_pcm_substream *substream;
3100 struct snd_pcm_runtime *runtime;
3101 snd_pcm_sframes_t result;
3104 snd_pcm_uframes_t frames;
3106 pcm_file = iocb->ki_filp->private_data;
3107 substream = pcm_file->substream;
3108 if (PCM_RUNTIME_CHECK(substream))
3110 runtime = substream->runtime;
3111 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3113 if (!iter_is_iovec(to))
3115 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3117 if (!frame_aligned(runtime, to->iov->iov_len))
3119 frames = bytes_to_samples(runtime, to->iov->iov_len);
3120 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3123 for (i = 0; i < to->nr_segs; ++i)
3124 bufs[i] = to->iov[i].iov_base;
3125 result = snd_pcm_lib_readv(substream, bufs, frames);
3127 result = frames_to_bytes(runtime, result);
3132 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3134 struct snd_pcm_file *pcm_file;
3135 struct snd_pcm_substream *substream;
3136 struct snd_pcm_runtime *runtime;
3137 snd_pcm_sframes_t result;
3140 snd_pcm_uframes_t frames;
3142 pcm_file = iocb->ki_filp->private_data;
3143 substream = pcm_file->substream;
3144 if (PCM_RUNTIME_CHECK(substream))
3146 runtime = substream->runtime;
3147 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3149 if (!iter_is_iovec(from))
3151 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3152 !frame_aligned(runtime, from->iov->iov_len))
3154 frames = bytes_to_samples(runtime, from->iov->iov_len);
3155 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3158 for (i = 0; i < from->nr_segs; ++i)
3159 bufs[i] = from->iov[i].iov_base;
3160 result = snd_pcm_lib_writev(substream, bufs, frames);
3162 result = frames_to_bytes(runtime, result);
3167 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3169 struct snd_pcm_file *pcm_file;
3170 struct snd_pcm_substream *substream;
3171 struct snd_pcm_runtime *runtime;
3173 snd_pcm_uframes_t avail;
3175 pcm_file = file->private_data;
3177 substream = pcm_file->substream;
3178 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3179 ok = EPOLLOUT | EPOLLWRNORM;
3181 ok = EPOLLIN | EPOLLRDNORM;
3182 if (PCM_RUNTIME_CHECK(substream))
3183 return ok | EPOLLERR;
3185 runtime = substream->runtime;
3186 poll_wait(file, &runtime->sleep, wait);
3189 snd_pcm_stream_lock_irq(substream);
3190 avail = snd_pcm_avail(substream);
3191 switch (runtime->status->state) {
3192 case SNDRV_PCM_STATE_RUNNING:
3193 case SNDRV_PCM_STATE_PREPARED:
3194 case SNDRV_PCM_STATE_PAUSED:
3195 if (avail >= runtime->control->avail_min)
3198 case SNDRV_PCM_STATE_DRAINING:
3199 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3206 mask = ok | EPOLLERR;
3209 snd_pcm_stream_unlock_irq(substream);
3218 * Only on coherent architectures, we can mmap the status and the control records
3219 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3221 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3223 * mmap status record
3225 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3227 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3228 struct snd_pcm_runtime *runtime;
3230 if (substream == NULL)
3231 return VM_FAULT_SIGBUS;
3232 runtime = substream->runtime;
3233 vmf->page = virt_to_page(runtime->status);
3234 get_page(vmf->page);
3238 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3240 .fault = snd_pcm_mmap_status_fault,
3243 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3244 struct vm_area_struct *area)
3247 if (!(area->vm_flags & VM_READ))
3249 size = area->vm_end - area->vm_start;
3250 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3252 area->vm_ops = &snd_pcm_vm_ops_status;
3253 area->vm_private_data = substream;
3254 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3259 * mmap control record
3261 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3263 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3264 struct snd_pcm_runtime *runtime;
3266 if (substream == NULL)
3267 return VM_FAULT_SIGBUS;
3268 runtime = substream->runtime;
3269 vmf->page = virt_to_page(runtime->control);
3270 get_page(vmf->page);
3274 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3276 .fault = snd_pcm_mmap_control_fault,
3279 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3280 struct vm_area_struct *area)
3283 if (!(area->vm_flags & VM_READ))
3285 size = area->vm_end - area->vm_start;
3286 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3288 area->vm_ops = &snd_pcm_vm_ops_control;
3289 area->vm_private_data = substream;
3290 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3294 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3296 if (pcm_file->no_compat_mmap)
3298 /* See pcm_control_mmap_allowed() below.
3299 * Since older alsa-lib requires both status and control mmaps to be
3300 * coupled, we have to disable the status mmap for old alsa-lib, too.
3302 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3303 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3308 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3310 if (pcm_file->no_compat_mmap)
3312 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3313 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3314 * thus it effectively assures the manual update of appl_ptr.
3316 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3321 #else /* ! coherent mmap */
3323 * don't support mmap for status and control records.
3325 #define pcm_status_mmap_allowed(pcm_file) false
3326 #define pcm_control_mmap_allowed(pcm_file) false
3328 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3329 struct vm_area_struct *area)
3333 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3334 struct vm_area_struct *area)
3338 #endif /* coherent mmap */
3340 static inline struct page *
3341 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3343 void *vaddr = substream->runtime->dma_area + ofs;
3344 return virt_to_page(vaddr);
3348 * fault callback for mmapping a RAM page
3350 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3352 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3353 struct snd_pcm_runtime *runtime;
3354 unsigned long offset;
3358 if (substream == NULL)
3359 return VM_FAULT_SIGBUS;
3360 runtime = substream->runtime;
3361 offset = vmf->pgoff << PAGE_SHIFT;
3362 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3363 if (offset > dma_bytes - PAGE_SIZE)
3364 return VM_FAULT_SIGBUS;
3365 if (substream->ops->page)
3366 page = substream->ops->page(substream, offset);
3368 page = snd_pcm_default_page_ops(substream, offset);
3370 return VM_FAULT_SIGBUS;
3376 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3377 .open = snd_pcm_mmap_data_open,
3378 .close = snd_pcm_mmap_data_close,
3381 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3382 .open = snd_pcm_mmap_data_open,
3383 .close = snd_pcm_mmap_data_close,
3384 .fault = snd_pcm_mmap_data_fault,
3388 * mmap the DMA buffer on RAM
3392 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3393 * @substream: PCM substream
3396 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3397 * this function is invoked implicitly.
3399 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3400 struct vm_area_struct *area)
3402 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3403 #ifdef CONFIG_GENERIC_ALLOCATOR
3404 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3405 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3406 return remap_pfn_range(area, area->vm_start,
3407 substream->dma_buffer.addr >> PAGE_SHIFT,
3408 area->vm_end - area->vm_start, area->vm_page_prot);
3410 #endif /* CONFIG_GENERIC_ALLOCATOR */
3411 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3412 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3413 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3414 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3416 substream->runtime->dma_area,
3417 substream->runtime->dma_addr,
3418 substream->runtime->dma_bytes);
3419 #endif /* CONFIG_X86 */
3420 /* mmap with fault handler */
3421 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3424 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3427 * mmap the DMA buffer on I/O memory area
3429 #if SNDRV_PCM_INFO_MMAP_IOMEM
3431 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3432 * @substream: PCM substream
3435 * When your hardware uses the iomapped pages as the hardware buffer and
3436 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3437 * is supposed to work only on limited architectures.
3439 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3440 struct vm_area_struct *area)
3442 struct snd_pcm_runtime *runtime = substream->runtime;
3444 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3445 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3447 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3448 #endif /* SNDRV_PCM_INFO_MMAP */
3453 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3454 struct vm_area_struct *area)
3456 struct snd_pcm_runtime *runtime;
3458 unsigned long offset;
3462 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3463 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3466 if (!(area->vm_flags & VM_READ))
3469 runtime = substream->runtime;
3470 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3472 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3474 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3475 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3477 size = area->vm_end - area->vm_start;
3478 offset = area->vm_pgoff << PAGE_SHIFT;
3479 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3480 if ((size_t)size > dma_bytes)
3482 if (offset > dma_bytes - size)
3485 area->vm_ops = &snd_pcm_vm_ops_data;
3486 area->vm_private_data = substream;
3487 if (substream->ops->mmap)
3488 err = substream->ops->mmap(substream, area);
3490 err = snd_pcm_lib_default_mmap(substream, area);
3492 atomic_inc(&substream->mmap_count);
3495 EXPORT_SYMBOL(snd_pcm_mmap_data);
3497 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3499 struct snd_pcm_file * pcm_file;
3500 struct snd_pcm_substream *substream;
3501 unsigned long offset;
3503 pcm_file = file->private_data;
3504 substream = pcm_file->substream;
3505 if (PCM_RUNTIME_CHECK(substream))
3508 offset = area->vm_pgoff << PAGE_SHIFT;
3510 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3511 if (!pcm_status_mmap_allowed(pcm_file))
3513 return snd_pcm_mmap_status(substream, file, area);
3514 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3515 if (!pcm_control_mmap_allowed(pcm_file))
3517 return snd_pcm_mmap_control(substream, file, area);
3519 return snd_pcm_mmap_data(substream, file, area);
3524 static int snd_pcm_fasync(int fd, struct file * file, int on)
3526 struct snd_pcm_file * pcm_file;
3527 struct snd_pcm_substream *substream;
3528 struct snd_pcm_runtime *runtime;
3530 pcm_file = file->private_data;
3531 substream = pcm_file->substream;
3532 if (PCM_RUNTIME_CHECK(substream))
3534 runtime = substream->runtime;
3535 return fasync_helper(fd, file, on, &runtime->fasync);
3541 #ifdef CONFIG_COMPAT
3542 #include "pcm_compat.c"
3544 #define snd_pcm_ioctl_compat NULL
3548 * To be removed helpers to keep binary compatibility
3551 #ifdef CONFIG_SND_SUPPORT_OLD_API
3552 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3553 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3555 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3556 struct snd_pcm_hw_params_old *oparams)
3560 memset(params, 0, sizeof(*params));
3561 params->flags = oparams->flags;
3562 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3563 params->masks[i].bits[0] = oparams->masks[i];
3564 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3565 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3566 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3567 params->info = oparams->info;
3568 params->msbits = oparams->msbits;
3569 params->rate_num = oparams->rate_num;
3570 params->rate_den = oparams->rate_den;
3571 params->fifo_size = oparams->fifo_size;
3574 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3575 struct snd_pcm_hw_params *params)
3579 memset(oparams, 0, sizeof(*oparams));
3580 oparams->flags = params->flags;
3581 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3582 oparams->masks[i] = params->masks[i].bits[0];
3583 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3584 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3585 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3586 oparams->info = params->info;
3587 oparams->msbits = params->msbits;
3588 oparams->rate_num = params->rate_num;
3589 oparams->rate_den = params->rate_den;
3590 oparams->fifo_size = params->fifo_size;
3593 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3594 struct snd_pcm_hw_params_old __user * _oparams)
3596 struct snd_pcm_hw_params *params;
3597 struct snd_pcm_hw_params_old *oparams = NULL;
3600 params = kmalloc(sizeof(*params), GFP_KERNEL);
3604 oparams = memdup_user(_oparams, sizeof(*oparams));
3605 if (IS_ERR(oparams)) {
3606 err = PTR_ERR(oparams);
3609 snd_pcm_hw_convert_from_old_params(params, oparams);
3610 err = snd_pcm_hw_refine(substream, params);
3614 err = fixup_unreferenced_params(substream, params);
3618 snd_pcm_hw_convert_to_old_params(oparams, params);
3619 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3628 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3629 struct snd_pcm_hw_params_old __user * _oparams)
3631 struct snd_pcm_hw_params *params;
3632 struct snd_pcm_hw_params_old *oparams = NULL;
3635 params = kmalloc(sizeof(*params), GFP_KERNEL);
3639 oparams = memdup_user(_oparams, sizeof(*oparams));
3640 if (IS_ERR(oparams)) {
3641 err = PTR_ERR(oparams);
3645 snd_pcm_hw_convert_from_old_params(params, oparams);
3646 err = snd_pcm_hw_params(substream, params);
3650 snd_pcm_hw_convert_to_old_params(oparams, params);
3651 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3659 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3662 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3665 unsigned long pgoff,
3666 unsigned long flags)
3668 struct snd_pcm_file *pcm_file = file->private_data;
3669 struct snd_pcm_substream *substream = pcm_file->substream;
3670 struct snd_pcm_runtime *runtime = substream->runtime;
3671 unsigned long offset = pgoff << PAGE_SHIFT;
3674 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3675 return (unsigned long)runtime->status;
3676 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3677 return (unsigned long)runtime->control;
3679 return (unsigned long)runtime->dma_area + offset;
3683 # define snd_pcm_get_unmapped_area NULL
3690 const struct file_operations snd_pcm_f_ops[2] = {
3692 .owner = THIS_MODULE,
3693 .write = snd_pcm_write,
3694 .write_iter = snd_pcm_writev,
3695 .open = snd_pcm_playback_open,
3696 .release = snd_pcm_release,
3697 .llseek = no_llseek,
3698 .poll = snd_pcm_poll,
3699 .unlocked_ioctl = snd_pcm_ioctl,
3700 .compat_ioctl = snd_pcm_ioctl_compat,
3701 .mmap = snd_pcm_mmap,
3702 .fasync = snd_pcm_fasync,
3703 .get_unmapped_area = snd_pcm_get_unmapped_area,
3706 .owner = THIS_MODULE,
3707 .read = snd_pcm_read,
3708 .read_iter = snd_pcm_readv,
3709 .open = snd_pcm_capture_open,
3710 .release = snd_pcm_release,
3711 .llseek = no_llseek,
3712 .poll = snd_pcm_poll,
3713 .unlocked_ioctl = snd_pcm_ioctl,
3714 .compat_ioctl = snd_pcm_ioctl_compat,
3715 .mmap = snd_pcm_mmap,
3716 .fasync = snd_pcm_fasync,
3717 .get_unmapped_area = snd_pcm_get_unmapped_area,