blob: d5443eeb8b6338a2a51d7a1c158e4d87c0184e16 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Digital Audio (PCM) abstract layer
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#include <linux/compat.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/time.h>
#include <linux/pm_qos.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>
#include <sound/minors.h>
#include <linux/uio.h>
#include <linux/delay.h>
#include "pcm_local.h"
#ifdef CONFIG_SND_DEBUG
#define CREATE_TRACE_POINTS
#include "pcm_param_trace.h"
#else
#define trace_hw_mask_param_enabled() 0
#define trace_hw_interval_param_enabled() 0
#define trace_hw_mask_param(substream, type, index, prev, curr)
#define trace_hw_interval_param(substream, type, index, prev, curr)
#endif
/*
* Compatibility
*/
struct snd_pcm_hw_params_old {
unsigned int flags;
unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
SNDRV_PCM_HW_PARAM_ACCESS + 1];
struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
unsigned int rmask;
unsigned int cmask;
unsigned int info;
unsigned int msbits;
unsigned int rate_num;
unsigned int rate_den;
snd_pcm_uframes_t fifo_size;
unsigned char reserved[64];
};
#ifdef CONFIG_SND_SUPPORT_OLD_API
#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params_old __user * _oparams);
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params_old __user * _oparams);
#endif
static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
/*
*
*/
static DECLARE_RWSEM(snd_pcm_link_rwsem);
void snd_pcm_group_init(struct snd_pcm_group *group)
{
spin_lock_init(&group->lock);
mutex_init(&group->mutex);
INIT_LIST_HEAD(&group->substreams);
refcount_set(&group->refs, 1);
}
/* define group lock helpers */
#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
{ \
if (nonatomic) \
mutex_ ## mutex_action(&group->mutex); \
else \
spin_ ## action(&group->lock); \
}
DEFINE_PCM_GROUP_LOCK(lock, lock);
DEFINE_PCM_GROUP_LOCK(unlock, unlock);
DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
/**
* snd_pcm_stream_lock - Lock the PCM stream
* @substream: PCM substream
*
* This locks the PCM stream's spinlock or mutex depending on the nonatomic
* flag of the given substream. This also takes the global link rw lock
* (or rw sem), too, for avoiding the race with linked streams.
*/
void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
{
snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
/**
* snd_pcm_stream_lock - Unlock the PCM stream
* @substream: PCM substream
*
* This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
*/
void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
{
snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
/**
* snd_pcm_stream_lock_irq - Lock the PCM stream
* @substream: PCM substream
*
* This locks the PCM stream like snd_pcm_stream_lock() and disables the local
* IRQ (only when nonatomic is false). In nonatomic case, this is identical
* as snd_pcm_stream_lock().
*/
void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
{
snd_pcm_group_lock_irq(&substream->self_group,
substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
/**
* snd_pcm_stream_unlock_irq - Unlock the PCM stream
* @substream: PCM substream
*
* This is a counter-part of snd_pcm_stream_lock_irq().
*/
void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
{
snd_pcm_group_unlock_irq(&substream->self_group,
substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
{
unsigned long flags = 0;
if (substream->pcm->nonatomic)
mutex_lock(&substream->self_group.mutex);
else
spin_lock_irqsave(&substream->self_group.lock, flags);
return flags;
}
EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
/**
* snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
* @substream: PCM substream
* @flags: irq flags
*
* This is a counter-part of snd_pcm_stream_lock_irqsave().
*/
void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
unsigned long flags)
{
if (substream->pcm->nonatomic)
mutex_unlock(&substream->self_group.mutex);
else
spin_unlock_irqrestore(&substream->self_group.lock, flags);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
/* Run PCM ioctl ops */
static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
unsigned cmd, void *arg)
{
if (substream->ops->ioctl)
return substream->ops->ioctl(substream, cmd, arg);
else
return snd_pcm_lib_ioctl(substream, cmd, arg);
}
int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
{
struct snd_pcm *pcm = substream->pcm;
struct snd_pcm_str *pstr = substream->pstr;
memset(info, 0, sizeof(*info));
info->card = pcm->card->number;
info->device = pcm->device;
info->stream = substream->stream;
info->subdevice = substream->number;
strlcpy(info->id, pcm->id, sizeof(info->id));
strlcpy(info->name, pcm->name, sizeof(info->name));
info->dev_class = pcm->dev_class;
info->dev_subclass = pcm->dev_subclass;
info->subdevices_count = pstr->substream_count;
info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
strlcpy(info->subname, substream->name, sizeof(info->subname));
return 0;
}
int snd_pcm_info_user(struct snd_pcm_substream *substream,
struct snd_pcm_info __user * _info)
{
struct snd_pcm_info *info;
int err;
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (! info)
return -ENOMEM;
err = snd_pcm_info(substream, info);
if (err >= 0) {
if (copy_to_user(_info, info, sizeof(*info)))
err = -EFAULT;
}
kfree(info);
return err;
}
static bool hw_support_mmap(struct snd_pcm_substream *substream)
{
if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
return false;
if (substream->ops->mmap ||
(substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV &&
substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC))
return true;
return dma_can_mmap(substream->dma_buffer.dev.dev);
}
static int constrain_mask_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_hw_constraints *constrs =
&substream->runtime->hw_constraints;
struct snd_mask *m;
unsigned int k;
struct snd_mask old_mask;
int changed;
for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
m = hw_param_mask(params, k);
if (snd_mask_empty(m))
return -EINVAL;
/* This parameter is not requested to change by a caller. */
if (!(params->rmask & (1 << k)))
continue;
if (trace_hw_mask_param_enabled())
old_mask = *m;
changed = snd_mask_refine(m, constrs_mask(constrs, k));
if (changed < 0)
return changed;
if (changed == 0)
continue;
/* Set corresponding flag so that the caller gets it. */
trace_hw_mask_param(substream, k, 0, &old_mask, m);
params->cmask |= 1 << k;
}
return 0;
}
static int constrain_interval_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_hw_constraints *constrs =
&substream->runtime->hw_constraints;
struct snd_interval *i;
unsigned int k;
struct snd_interval old_interval;
int changed;
for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
i = hw_param_interval(params, k);
if (snd_interval_empty(i))
return -EINVAL;
/* This parameter is not requested to change by a caller. */
if (!(params->rmask & (1 << k)))
continue;
if (trace_hw_interval_param_enabled())
old_interval = *i;
changed = snd_interval_refine(i, constrs_interval(constrs, k));
if (changed < 0)
return changed;
if (changed == 0)
continue;
/* Set corresponding flag so that the caller gets it. */
trace_hw_interval_param(substream, k, 0, &old_interval, i);
params->cmask |= 1 << k;
}
return 0;
}
static int constrain_params_by_rules(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_hw_constraints *constrs =
&substream->runtime->hw_constraints;
unsigned int k;
unsigned int *rstamps;
unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
unsigned int stamp;
struct snd_pcm_hw_rule *r;
unsigned int d;
struct snd_mask old_mask;
struct snd_interval old_interval;
bool again;
int changed, err = 0;
/*
* Each application of rule has own sequence number.
*
* Each member of 'rstamps' array represents the sequence number of
* recent application of corresponding rule.
*/
rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
if (!rstamps)
return -ENOMEM;
/*
* Each member of 'vstamps' array represents the sequence number of
* recent application of rule in which corresponding parameters were
* changed.
*
* In initial state, elements corresponding to parameters requested by
* a caller is 1. For unrequested parameters, corresponding members
* have 0 so that the parameters are never changed anymore.
*/
for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
/* Due to the above design, actual sequence number starts at 2. */
stamp = 2;
retry:
/* Apply all rules in order. */
again = false;
for (k = 0; k < constrs->rules_num; k++) {
r = &constrs->rules[k];
/*
* Check condition bits of this rule. When the rule has
* some condition bits, parameter without the bits is
* never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
* is an example of the condition bits.
*/
if (r->cond && !(r->cond & params->flags))
continue;
/*
* The 'deps' array includes maximum three dependencies
* to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
* member of this array is a sentinel and should be
* negative value.
*
* This rule should be processed in this time when dependent
* parameters were changed at former applications of the other
* rules.
*/
for (d = 0; r->deps[d] >= 0; d++) {
if (vstamps[r->deps[d]] > rstamps[k])
break;
}
if (r->deps[d] < 0)
continue;
if (trace_hw_mask_param_enabled()) {
if (hw_is_mask(r->var))
old_mask = *hw_param_mask(params, r->var);
}
if (trace_hw_interval_param_enabled()) {
if (hw_is_interval(r->var))
old_interval = *hw_param_interval(params, r->var);
}
changed = r->func(params, r);
if (changed < 0) {
err = changed;
goto out;
}
/*
* When the parameter is changed, notify it to the caller
* by corresponding returned bit, then preparing for next
* iteration.
*/
if (changed && r->var >= 0) {
if (hw_is_mask(r->var)) {
trace_hw_mask_param(substream, r->var,
k + 1, &old_mask,
hw_param_mask(params, r->var));
}
if (hw_is_interval(r->var)) {
trace_hw_interval_param(substream, r->var,
k + 1, &old_interval,
hw_param_interval(params, r->var));
}
params->cmask |= (1 << r->var);
vstamps[r->var] = stamp;
again = true;
}
rstamps[k] = stamp++;
}
/* Iterate to evaluate all rules till no parameters are changed. */
if (again)
goto retry;
out:
kfree(rstamps);
return err;
}
static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
const struct snd_interval *i;
const struct snd_mask *m;
int err;
if (!params->msbits) {
i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
if (snd_interval_single(i))
params->msbits = snd_interval_value(i);
}
if (!params->rate_den) {
i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
if (snd_interval_single(i)) {
params->rate_num = snd_interval_value(i);
params->rate_den = 1;
}
}
if (!params->fifo_size) {
m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
if (snd_mask_single(m) && snd_interval_single(i)) {
err = snd_pcm_ops_ioctl(substream,
SNDRV_PCM_IOCTL1_FIFO_SIZE,
params);
if (err < 0)
return err;
}
}
if (!params->info) {
params->info = substream->runtime->hw.info;
params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
SNDRV_PCM_INFO_DRAIN_TRIGGER);
if (!hw_support_mmap(substream))
params->info &= ~(SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID);
}
return 0;
}
int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
int err;
params->info = 0;
params->fifo_size = 0;
if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
params->msbits = 0;
if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
params->rate_num = 0;
params->rate_den = 0;
}
err = constrain_mask_params(substream, params);
if (err < 0)
return err;
err = constrain_interval_params(substream, params);
if (err < 0)
return err;
err = constrain_params_by_rules(substream, params);
if (err < 0)
return err;
params->rmask = 0;
return 0;
}
EXPORT_SYMBOL(snd_pcm_hw_refine);
static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params __user * _params)
{
struct snd_pcm_hw_params *params;
int err;
params = memdup_user(_params, sizeof(*params));
if (IS_ERR(params))
return PTR_ERR(params);
err = snd_pcm_hw_refine(substream, params);
if (err < 0)
goto end;
err = fixup_unreferenced_params(substream, params);
if (err < 0)
goto end;
if (copy_to_user(_params, params, sizeof(*params)))
err = -EFAULT;
end:
kfree(params);
return err;
}
static int period_to_usecs(struct snd_pcm_runtime *runtime)
{
int usecs;
if (! runtime->rate)
return -1; /* invalid */
/* take 75% of period time as the deadline */
usecs = (750000 / runtime->rate) * runtime->period_size;
usecs += ((750000 % runtime->rate) * runtime->period_size) /
runtime->rate;
return usecs;
}
static void snd_pcm_set_state(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
snd_pcm_stream_lock_irq(substream);
if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
substream->runtime->status->state = state;
snd_pcm_stream_unlock_irq(substream);
}
static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
int event)
{
#ifdef CONFIG_SND_PCM_TIMER
if (substream->timer)
snd_timer_notify(substream->timer, event,
&substream->runtime->trigger_tstamp);
#endif
}
static void snd_pcm_sync_stop(struct snd_pcm_substream *substream)
{
if (substream->runtime->stop_operating) {
substream->runtime->stop_operating = false;
if (substream->ops->sync_stop)
substream->ops->sync_stop(substream);
else if (substream->pcm->card->sync_irq > 0)
synchronize_irq(substream->pcm->card->sync_irq);
}
}
/**
* snd_pcm_hw_param_choose - choose a configuration defined by @params
* @pcm: PCM instance
* @params: the hw_params instance
*
* Choose one configuration from configuration space defined by @params.
* The configuration chosen is that obtained fixing in this order:
* first access, first format, first subformat, min channels,
* min rate, min period time, max buffer size, min tick time
*
* Return: Zero if successful, or a negative error code on failure.
*/
static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params)
{
static const int vars[] = {
SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_SUBFORMAT,
SNDRV_PCM_HW_PARAM_CHANNELS,
SNDRV_PCM_HW_PARAM_RATE,
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
SNDRV_PCM_HW_PARAM_TICK_TIME,
-1
};
const int *v;
struct snd_mask old_mask;
struct snd_interval old_interval;
int changed;
for (v = vars; *v != -1; v++) {
/* Keep old parameter to trace. */
if (trace_hw_mask_param_enabled()) {
if (hw_is_mask(*v))
old_mask = *hw_param_mask(params, *v);
}
if (trace_hw_interval_param_enabled()) {
if (hw_is_interval(*v))
old_interval = *hw_param_interval(params, *v);
}
if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
else
changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
if (changed < 0)
return changed;
if (changed == 0)
continue;
/* Trace the changed parameter. */
if (hw_is_mask(*v)) {
trace_hw_mask_param(pcm, *v, 0, &old_mask,
hw_param_mask(params, *v));
}
if (hw_is_interval(*v)) {
trace_hw_interval_param(pcm, *v, 0, &old_interval,
hw_param_interval(params, *v));
}
}
return 0;
}
static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime;
int err, usecs;
unsigned int bits;
snd_pcm_uframes_t frames;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_PREPARED:
break;
default:
snd_pcm_stream_unlock_irq(substream);
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
if (!substream->oss.oss)
#endif
if (atomic_read(&substream->mmap_count))
return -EBADFD;
snd_pcm_sync_stop(substream);
params->rmask = ~0U;
err = snd_pcm_hw_refine(substream, params);
if (err < 0)
goto _error;
err = snd_pcm_hw_params_choose(substream, params);
if (err < 0)
goto _error;
err = fixup_unreferenced_params(substream, params);
if (err < 0)
goto _error;
if (substream->managed_buffer_alloc) {
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(params));
if (err < 0)
goto _error;
runtime->buffer_changed = err > 0;
}
if (substream->ops->hw_params != NULL) {
err = substream->ops->hw_params(substream, params);
if (err < 0)
goto _error;
}
runtime->access = params_access(params);
runtime->format = params_format(params);
runtime->subformat = params_subformat(params);
runtime->channels = params_channels(params);
runtime->rate = params_rate(params);
runtime->period_size = params_period_size(params);
runtime->periods = params_periods(params);
runtime->buffer_size = params_buffer_size(params);
runtime->info = params->info;
runtime->rate_num = params->rate_num;
runtime->rate_den = params->rate_den;
runtime->no_period_wakeup =
(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
bits = snd_pcm_format_physical_width(runtime->format);
runtime->sample_bits = bits;
bits *= runtime->channels;
runtime->frame_bits = bits;
frames = 1;
while (bits % 8 != 0) {
bits *= 2;
frames *= 2;
}
runtime->byte_align = bits / 8;
runtime->min_align = frames;
/* Default sw params */
runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
runtime->period_step = 1;
runtime->control->avail_min = runtime->period_size;
runtime->start_threshold = 1;
runtime->stop_threshold = runtime->buffer_size;
runtime->silence_threshold = 0;
runtime->silence_size = 0;
runtime->boundary = runtime->buffer_size;
while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
runtime->boundary *= 2;
/* clear the buffer for avoiding possible kernel info leaks */
if (runtime->dma_area && !substream->ops->copy_user)
memset(runtime->dma_area, 0, runtime->dma_bytes);
snd_pcm_timer_resolution_change(substream);
snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
if (pm_qos_request_active(&substream->latency_pm_qos_req))
pm_qos_remove_request(&substream->latency_pm_qos_req);
if ((usecs = period_to_usecs(runtime)) >= 0)
pm_qos_add_request(&substream->latency_pm_qos_req,
PM_QOS_CPU_DMA_LATENCY, usecs);
return 0;
_error:
/* hardware might be unusable from this time,
so we force application to retry to set
the correct hardware parameter settings */
snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
if (substream->ops->hw_free != NULL)
substream->ops->hw_free(substream);
if (substream->managed_buffer_alloc)
snd_pcm_lib_free_pages(substream);
return err;
}
static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params __user * _params)
{
struct snd_pcm_hw_params *params;
int err;
params = memdup_user(_params, sizeof(*params));
if (IS_ERR(params))
return PTR_ERR(params);
err = snd_pcm_hw_params(substream, params);
if (err < 0)
goto end;
if (copy_to_user(_params, params, sizeof(*params)))
err = -EFAULT;
end:
kfree(params);
return err;
}
static int do_hw_free(struct snd_pcm_substream *substream)
{
int result = 0;
snd_pcm_sync_stop(substream);
if (substream->ops->hw_free)
result = substream->ops->hw_free(substream);
if (substream->managed_buffer_alloc)
snd_pcm_lib_free_pages(substream);
return result;
}
static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
int result;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_PREPARED:
break;
default:
snd_pcm_stream_unlock_irq(substream);
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
if (atomic_read(&substream->mmap_count))
return -EBADFD;
result = do_hw_free(substream);
snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
pm_qos_remove_request(&substream->latency_pm_qos_req);
return result;
}
static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
struct snd_pcm_sw_params *params)
{
struct snd_pcm_runtime *runtime;
int err;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
snd_pcm_stream_unlock_irq(substream);
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
if (params->tstamp_mode < 0 ||
params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
return -EINVAL;
if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
return -EINVAL;
if (params->avail_min == 0)
return -EINVAL;
if (params->silence_size >= runtime->boundary) {
if (params->silence_threshold != 0)
return -EINVAL;
} else {
if (params->silence_size > params->silence_threshold)
return -EINVAL;
if (params->silence_threshold > runtime->buffer_size)
return -EINVAL;
}
err = 0;
snd_pcm_stream_lock_irq(substream);
runtime->tstamp_mode = params->tstamp_mode;
if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
runtime->tstamp_type = params->tstamp_type;
runtime->period_step = params->period_step;
runtime->control->avail_min = params->avail_min;
runtime->start_threshold = params->start_threshold;
runtime->stop_threshold = params->stop_threshold;
runtime->silence_threshold = params->silence_threshold;
runtime->silence_size = params->silence_size;
params->boundary = runtime->boundary;
if (snd_pcm_running(substream)) {
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, ULONG_MAX);
err = snd_pcm_update_state(substream, runtime);
}
snd_pcm_stream_unlock_irq(substream);
return err;
}
static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
struct snd_pcm_sw_params __user * _params)
{
struct snd_pcm_sw_params params;
int err;
if (copy_from_user(&params, _params, sizeof(params)))
return -EFAULT;
err = snd_pcm_sw_params(substream, &params);
if (copy_to_user(_params, &params, sizeof(params)))
return -EFAULT;
return err;
}
static inline snd_pcm_uframes_t
snd_pcm_calc_delay(struct snd_pcm_substream *substream)
{
snd_pcm_uframes_t delay;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
delay = snd_pcm_playback_hw_avail(substream->runtime);
else
delay = snd_pcm_capture_avail(substream->runtime);
return delay + substream->runtime->delay;
}
int snd_pcm_status64(struct snd_pcm_substream *substream,
struct snd_pcm_status64 *status)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
&runtime->audio_tstamp_config);
/* backwards compatible behavior */
if (runtime->audio_tstamp_config.type_requested ==
SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
runtime->audio_tstamp_config.type_requested =
SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
else
runtime->audio_tstamp_config.type_requested =
SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
runtime->audio_tstamp_report.valid = 0;
} else
runtime->audio_tstamp_report.valid = 1;
status->state = runtime->status->state;
status->suspended_state = runtime->status->suspended_state;
if (status->state == SNDRV_PCM_STATE_OPEN)
goto _end;
status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
if (snd_pcm_running(substream)) {
snd_pcm_update_hw_ptr(substream);
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
status->tstamp_sec = runtime->status->tstamp.tv_sec;
status->tstamp_nsec =
runtime->status->tstamp.tv_nsec;
status->driver_tstamp_sec =
runtime->driver_tstamp.tv_sec;
status->driver_tstamp_nsec =
runtime->driver_tstamp.tv_nsec;
status->audio_tstamp_sec =
runtime->status->audio_tstamp.tv_sec;
status->audio_tstamp_nsec =
runtime->status->audio_tstamp.tv_nsec;
if (runtime->audio_tstamp_report.valid == 1)
/* backwards compatibility, no report provided in COMPAT mode */
snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
&status->audio_tstamp_accuracy,
&runtime->audio_tstamp_report);
goto _tstamp_end;
}
} else {
/* get tstamp only in fallback mode and only if enabled */
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
struct timespec64 tstamp;
snd_pcm_gettime(runtime, &tstamp);
status->tstamp_sec = tstamp.tv_sec;
status->tstamp_nsec = tstamp.tv_nsec;
}
}
_tstamp_end:
status->appl_ptr = runtime->control->appl_ptr;
status->hw_ptr = runtime->status->hw_ptr;
status->avail = snd_pcm_avail(substream);
status->delay = snd_pcm_running(substream) ?
snd_pcm_calc_delay(substream) : 0;
status->avail_max = runtime->avail_max;
status->overrange = runtime->overrange;
runtime->avail_max = 0;
runtime->overrange = 0;
_end:
snd_pcm_stream_unlock_irq(substream);
return 0;
}
static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
struct snd_pcm_status64 __user * _status,
bool ext)
{
struct snd_pcm_status64 status;
int res;
memset(&status, 0, sizeof(status));
/*
* with extension, parameters are read/write,
* get audio_tstamp_data from user,
* ignore rest of status structure
*/
if (ext && get_user(status.audio_tstamp_data,
(u32 __user *)(&_status->audio_tstamp_data)))
return -EFAULT;
res = snd_pcm_status64(substream, &status);
if (res < 0)
return res;
if (copy_to_user(_status, &status, sizeof(status)))
return -EFAULT;
return 0;
}
static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
struct snd_pcm_status32 __user * _status,
bool ext)
{
struct snd_pcm_status64 status64;
struct snd_pcm_status32 status32;
int res;
memset(&status64, 0, sizeof(status64));
memset(&status32, 0, sizeof(status32));
/*
* with extension, parameters are read/write,
* get audio_tstamp_data from user,
* ignore rest of status structure
*/
if (ext && get_user(status64.audio_tstamp_data,
(u32 __user *)(&_status->audio_tstamp_data)))
return -EFAULT;
res = snd_pcm_status64(substream, &status64);
if (res < 0)
return res;
status32 = (struct snd_pcm_status32) {
.state = status64.state,
.trigger_tstamp_sec = status64.trigger_tstamp_sec,
.trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
.tstamp_sec = status64.tstamp_sec,
.tstamp_nsec = status64.tstamp_nsec,
.appl_ptr = status64.appl_ptr,
.hw_ptr = status64.hw_ptr,
.delay = status64.delay,
.avail = status64.avail,
.avail_max = status64.avail_max,
.overrange = status64.overrange,
.suspended_state = status64.suspended_state,
.audio_tstamp_data = status64.audio_tstamp_data,
.audio_tstamp_sec = status64.audio_tstamp_sec,
.audio_tstamp_nsec = status64.audio_tstamp_nsec,
.driver_tstamp_sec = status64.audio_tstamp_sec,
.driver_tstamp_nsec = status64.audio_tstamp_nsec,
.audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
};
if (copy_to_user(_status, &status32, sizeof(status32)))
return -EFAULT;
return 0;
}
static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
struct snd_pcm_channel_info * info)
{
struct snd_pcm_runtime *runtime;
unsigned int channel;
channel = info->channel;
runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
snd_pcm_stream_unlock_irq(substream);
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
if (channel >= runtime->channels)
return -EINVAL;
memset(info, 0, sizeof(*info));
info->channel = channel;
return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
}
static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
struct snd_pcm_channel_info __user * _info)
{
struct snd_pcm_channel_info info;
int res;
if (copy_from_user(&info, _info, sizeof(info)))
return -EFAULT;
res = snd_pcm_channel_info(substream, &info);
if (res < 0)
return res;
if (copy_to_user(_info, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->trigger_master == NULL)
return;
if (runtime->trigger_master == substream) {
if (!runtime->trigger_tstamp_latched)
snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
} else {
snd_pcm_trigger_tstamp(runtime->trigger_master);
runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
}
runtime->trigger_master = NULL;
}
#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
struct action_ops {
int (*pre_action)(struct snd_pcm_substream *substream,
snd_pcm_state_t state);
int (*do_action)(struct snd_pcm_substream *substream,
snd_pcm_state_t state);
void (*undo_action)(struct snd_pcm_substream *substream,
snd_pcm_state_t state);
void (*post_action)(struct snd_pcm_substream *substream,
snd_pcm_state_t state);
};
/*
* this functions is core for handling of linked stream
* Note: the stream state might be changed also on failure
* Note2: call with calling stream lock + link lock
*/
static int snd_pcm_action_group(const struct action_ops *ops,
struct snd_pcm_substream *substream,
snd_pcm_state_t state,
bool do_lock)
{
struct snd_pcm_substream *s = NULL;
struct snd_pcm_substream *s1;
int res = 0, depth = 1;
snd_pcm_group_for_each_entry(s, substream) {
if (do_lock && s != substream) {
if (s->pcm->nonatomic)
mutex_lock_nested(&s->self_group.mutex, depth);
else
spin_lock_nested(&s->self_group.lock, depth);
depth++;
}
res = ops->pre_action(s, state);
if (res < 0)
goto _unlock;
}
snd_pcm_group_for_each_entry(s, substream) {
res = ops->do_action(s, state);
if (res < 0) {
if (ops->undo_action) {
snd_pcm_group_for_each_entry(s1, substream) {
if (s1 == s) /* failed stream */
break;
ops->undo_action(s1, state);
}
}
s = NULL; /* unlock all */
goto _unlock;
}
}
snd_pcm_group_for_each_entry(s, substream) {
ops->post_action(s, state);
}
_unlock:
if (do_lock) {
/* unlock streams */
snd_pcm_group_for_each_entry(s1, substream) {
if (s1 != substream) {
if (s1->pcm->nonatomic)
mutex_unlock(&s1->self_group.mutex);
else
spin_unlock(&s1->self_group.lock);
}
if (s1 == s) /* end */
break;
}
}
return res;
}
/*
* Note: call with stream lock
*/
static int snd_pcm_action_single(const struct action_ops *ops,
struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
int res;
res = ops->pre_action(substream, state);
if (res < 0)
return res;
res = ops->do_action(substream, state);
if (res == 0)
ops->post_action(substream, state);
else if (ops->undo_action)
ops->undo_action(substream, state);
return res;
}
static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
struct snd_pcm_group *new_group)
{
substream->group = new_group;
list_move(&substream->link_list, &new_group->substreams);
}
/*
* Unref and unlock the group, but keep the stream lock;
* when the group becomes empty and no longer referred, destroy itself
*/
static void snd_pcm_group_unref(struct snd_pcm_group *group,
struct snd_pcm_substream *substream)
{
bool do_free;
if (!group)
return;
do_free = refcount_dec_and_test(&group->refs);
snd_pcm_group_unlock(group, substream->pcm->nonatomic);
if (do_free)
kfree(group);
}
/*
* Lock the group inside a stream lock and reference it;
* return the locked group object, or NULL if not linked
*/
static struct snd_pcm_group *
snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
{
bool nonatomic = substream->pcm->nonatomic;
struct snd_pcm_group *group;
bool trylock;
for (;;) {
if (!snd_pcm_stream_linked(substream))
return NULL;
group = substream->group;
/* block freeing the group object */
refcount_inc(&group->refs);
trylock = nonatomic ? mutex_trylock(&group->mutex) :
spin_trylock(&group->lock);
if (trylock)
break; /* OK */
/* re-lock for avoiding ABBA deadlock */
snd_pcm_stream_unlock(substream);
snd_pcm_group_lock(group, nonatomic);
snd_pcm_stream_lock(substream);
/* check the group again; the above opens a small race window */
if (substream->group == group)
break; /* OK */
/* group changed, try again */
snd_pcm_group_unref(group, substream);
}
return group;
}
/*
* Note: call with stream lock
*/
static int snd_pcm_action(const struct action_ops *ops,
struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_group *group;
int res;
group = snd_pcm_stream_group_ref(substream);
if (group)
res = snd_pcm_action_group(ops, substream, state, true);
else
res = snd_pcm_action_single(ops, substream, state);
snd_pcm_group_unref(group, substream);
return res;
}
/*
* Note: don't use any locks before
*/
static int snd_pcm_action_lock_irq(const struct action_ops *ops,
struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
int res;
snd_pcm_stream_lock_irq(substream);
res = snd_pcm_action(ops, substream, state);
snd_pcm_stream_unlock_irq(substream);
return res;
}
/*
*/
static int snd_pcm_action_nonatomic(const struct action_ops *ops,
struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
int res;
/* Guarantee the group members won't change during non-atomic action */
down_read(&snd_pcm_link_rwsem);
if (snd_pcm_stream_linked(substream))
res = snd_pcm_action_group(ops, substream, state, false);
else
res = snd_pcm_action_single(ops, substream, state);
up_read(&snd_pcm_link_rwsem);
return res;
}
/*
* start callbacks
*/
static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
return -EBADFD;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
!snd_pcm_playback_data(substream))
return -EPIPE;
runtime->trigger_tstamp_latched = false;
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_start(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
if (substream->runtime->trigger_master != substream)
return 0;
return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
}
static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
if (substream->runtime->trigger_master == substream)
substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
}
static void snd_pcm_post_start(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
runtime->hw_ptr_jiffies = jiffies;
runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
runtime->rate;
runtime->status->state = state;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, ULONG_MAX);
snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
}
static const struct action_ops snd_pcm_action_start = {
.pre_action = snd_pcm_pre_start,
.do_action = snd_pcm_do_start,
.undo_action = snd_pcm_undo_start,
.post_action = snd_pcm_post_start
};
/**
* snd_pcm_start - start all linked streams
* @substream: the PCM substream instance
*
* Return: Zero if successful, or a negative error code.
* The stream lock must be acquired before calling this function.
*/
int snd_pcm_start(struct snd_pcm_substream *substream)
{
return snd_pcm_action(&snd_pcm_action_start, substream,
SNDRV_PCM_STATE_RUNNING);
}
/* take the stream lock and start the streams */
static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
{
return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
SNDRV_PCM_STATE_RUNNING);
}
/*
* stop callbacks
*/
static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
if (substream->runtime->trigger_master == substream &&
snd_pcm_running(substream))
substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
return 0; /* unconditonally stop all substreams */
}
static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->status->state != state) {
snd_pcm_trigger_tstamp(substream);
runtime->status->state = state;
snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
}
runtime->stop_operating = true;
wake_up(&runtime->sleep);
wake_up(&runtime->tsleep);
}
static const struct action_ops snd_pcm_action_stop = {
.pre_action = snd_pcm_pre_stop,
.do_action = snd_pcm_do_stop,
.post_action = snd_pcm_post_stop
};
/**
* snd_pcm_stop - try to stop all running streams in the substream group
* @substream: the PCM substream instance
* @state: PCM state after stopping the stream
*
* The state of each stream is then changed to the given state unconditionally.
*
* Return: Zero if successful, or a negative error code.
*/
int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
{
return snd_pcm_action(&snd_pcm_action_stop, substream, state);
}
EXPORT_SYMBOL(snd_pcm_stop);
/**
* snd_pcm_drain_done - stop the DMA only when the given stream is playback
* @substream: the PCM substream
*
* After stopping, the state is changed to SETUP.
* Unlike snd_pcm_stop(), this affects only the given stream.
*
* Return: Zero if succesful, or a negative error code.
*/
int snd_pcm_drain_done(struct snd_pcm_substream *substream)
{
return snd_pcm_action_single(&snd_pcm_action_stop, substream,
SNDRV_PCM_STATE_SETUP);
}
/**
* snd_pcm_stop_xrun - stop the running streams as XRUN
* @substream: the PCM substream instance
*
* This stops the given running substream (and all linked substreams) as XRUN.
* Unlike snd_pcm_stop(), this function takes the substream lock by itself.
*
* Return: Zero if successful, or a negative error code.
*/
int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
{
unsigned long flags;
snd_pcm_stream_lock_irqsave(substream, flags);
if (substream->runtime && snd_pcm_running(substream))
__snd_pcm_xrun(substream);
snd_pcm_stream_unlock_irqrestore(substream, flags);
return 0;
}
EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
/*
* pause callbacks: pass boolean (to start pause or resume) as state argument
*/
#define pause_pushed(state) (__force bool)(state)
static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
return -ENOSYS;
if (pause_pushed(state)) {
if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
return -EBADFD;
} else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
return -EBADFD;
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
if (substream->runtime->trigger_master != substream)
return 0;
/* some drivers might use hw_ptr to recover from the pause -
update the hw_ptr now */
if (pause_pushed(state))
snd_pcm_update_hw_ptr(substream);
/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
* a delta between the current jiffies, this gives a large enough
* delta, effectively to skip the check once.
*/
substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
return substream->ops->trigger(substream,
pause_pushed(state) ?
SNDRV_PCM_TRIGGER_PAUSE_PUSH :
SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
}
static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
if (substream->runtime->trigger_master == substream)
substream->ops->trigger(substream,
pause_pushed(state) ?
SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
SNDRV_PCM_TRIGGER_PAUSE_PUSH);
}
static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
if (pause_pushed(state)) {
runtime->status->state = SNDRV_PCM_STATE_PAUSED;
snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
wake_up(&runtime->sleep);
wake_up(&runtime->tsleep);
} else {
runtime->status->state = SNDRV_PCM_STATE_RUNNING;
snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
}
}
static const struct action_ops snd_pcm_action_pause = {
.pre_action = snd_pcm_pre_pause,
.do_action = snd_pcm_do_pause,
.undo_action = snd_pcm_undo_pause,
.post_action = snd_pcm_post_pause
};
/*
* Push/release the pause for all linked streams.
*/
static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
{
return snd_pcm_action(&snd_pcm_action_pause, substream,
(__force snd_pcm_state_t)push);
}
static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
bool push)
{
return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
(__force snd_pcm_state_t)push);
}
#ifdef CONFIG_PM
/* suspend callback: state argument ignored */
static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
switch (runtime->status->state) {
case SNDRV_PCM_STATE_SUSPENDED:
return -EBUSY;
/* unresumable PCM state; return -EBUSY for skipping suspend */
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_DISCONNECTED:
return -EBUSY;
}
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->trigger_master != substream)
return 0;
if (! snd_pcm_running(substream))
return 0;
substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
return 0; /* suspend unconditionally */
}
static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
runtime->status->suspended_state = runtime->status->state;
runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
wake_up(&runtime->sleep);
wake_up(&runtime->tsleep);
}
static const struct action_ops snd_pcm_action_suspend = {
.pre_action = snd_pcm_pre_suspend,
.do_action = snd_pcm_do_suspend,
.post_action = snd_pcm_post_suspend
};
/*
* snd_pcm_suspend - trigger SUSPEND to all linked streams
* @substream: the PCM substream
*
* After this call, all streams are changed to SUSPENDED state.
*
* Return: Zero if successful, or a negative error code.
*/
static int snd_pcm_suspend(struct snd_pcm_substream *substream)
{
int err;
unsigned long flags;
snd_pcm_stream_lock_irqsave(substream, flags);
err = snd_pcm_action(&snd_pcm_action_suspend, substream,
ACTION_ARG_IGNORE);
snd_pcm_stream_unlock_irqrestore(substream, flags);
return err;
}
/**
* snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
* @pcm: the PCM instance
*
* After this call, all streams are changed to SUSPENDED state.
*
* Return: Zero if successful (or @pcm is %NULL), or a negative error code.
*/
int snd_pcm_suspend_all(struct snd_pcm *pcm)
{
struct snd_pcm_substream *substream;
int stream, err = 0;
if (! pcm)
return 0;
for (stream = 0; stream < 2; stream++) {
for (substream = pcm->streams[stream].substream;
substream; substream = substream->next) {
/* FIXME: the open/close code should lock this as well */
if (substream->runtime == NULL)
continue;
/*
* Skip BE dai link PCM's that are internal and may
* not have their substream ops set.
*/
if (!substream->ops)
continue;
err = snd_pcm_suspend(substream);
if (err < 0 && err != -EBUSY)
return err;
}
}
return 0;
}
EXPORT_SYMBOL(snd_pcm_suspend_all);
/* resume callbacks: state argument ignored */
static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
return -ENOSYS;
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->trigger_master != substream)
return 0;
/* DMA not running previously? */
if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
(runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
return 0;
return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
}
static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
if (substream->runtime->trigger_master == substream &&
snd_pcm_running(substream))
substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
}
static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
runtime->status->state = runtime->status->suspended_state;
snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
snd_pcm_sync_stop(substream);
}
static const struct action_ops snd_pcm_action_resume = {
.pre_action = snd_pcm_pre_resume,
.do_action = snd_pcm_do_resume,
.undo_action = snd_pcm_undo_resume,
.post_action = snd_pcm_post_resume
};
static int snd_pcm_resume(struct snd_pcm_substream *substream)
{
return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
ACTION_ARG_IGNORE);
}
#else
static int snd_pcm_resume(struct snd_pcm_substream *substream)
{
return -ENOSYS;
}
#endif /* CONFIG_PM */
/*
* xrun ioctl
*
* Change the RUNNING stream(s) to XRUN state.
*/
static int snd_pcm_xrun(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int result;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_XRUN:
result = 0; /* already there */
break;
case SNDRV_PCM_STATE_RUNNING:
__snd_pcm_xrun(substream);
result = 0;
break;
default:
result = -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
return result;
}
/*
* reset ioctl
*/
/* reset callbacks: state argument ignored */
static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
switch (runtime->status->state) {
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_PAUSED:
case SNDRV_PCM_STATE_SUSPENDED:
return 0;
default:
return -EBADFD;
}
}
static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
if (err < 0)
return err;
runtime->hw_ptr_base = 0;
runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
runtime->status->hw_ptr % runtime->period_size;
runtime->silence_start = runtime->status->hw_ptr;
runtime->silence_filled = 0;
return 0;
}
static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->control->appl_ptr = runtime->status->hw_ptr;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, ULONG_MAX);
}
static const struct action_ops snd_pcm_action_reset = {
.pre_action = snd_pcm_pre_reset,
.do_action = snd_pcm_do_reset,
.post_action = snd_pcm_post_reset
};
static int snd_pcm_reset(struct snd_pcm_substream *substream)
{
return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
ACTION_ARG_IGNORE);
}
/*
* prepare ioctl
*/
/* pass f_flags as state argument */
static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int f_flags = (__force int)state;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
return -EBADFD;
if (snd_pcm_running(substream))
return -EBUSY;
substream->f_flags = f_flags;
return 0;
}
static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
int err;
snd_pcm_sync_stop(substream);
err = substream->ops->prepare(substream);
if (err < 0)
return err;
return snd_pcm_do_reset(substream, state);
}
static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->control->appl_ptr = runtime->status->hw_ptr;
snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
}
static const struct action_ops snd_pcm_action_prepare = {
.pre_action = snd_pcm_pre_prepare,
.do_action = snd_pcm_do_prepare,
.post_action = snd_pcm_post_prepare
};
/**
* snd_pcm_prepare - prepare the PCM substream to be triggerable
* @substream: the PCM substream instance
* @file: file to refer f_flags
*
* Return: Zero if successful, or a negative error code.
*/
static int snd_pcm_prepare(struct snd_pcm_substream *substream,
struct file *file)
{
int f_flags;
if (file)
f_flags = file->f_flags;
else
f_flags = substream->f_flags;
snd_pcm_stream_lock_irq(substream);
switch (substream->runtime->status->state) {
case SNDRV_PCM_STATE_PAUSED:
snd_pcm_pause(substream, false);
/* fallthru */
case SNDRV_PCM_STATE_SUSPENDED:
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
break;
}
snd_pcm_stream_unlock_irq(substream);
return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
substream,
(__force snd_pcm_state_t)f_flags);
}
/*
* drain ioctl
*/
/* drain init callbacks: state argument ignored */
static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
switch (runtime->status->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_DISCONNECTED:
case SNDRV_PCM_STATE_SUSPENDED:
return -EBADFD;
}
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
switch (runtime->status->state) {
case SNDRV_PCM_STATE_PREPARED:
/* start playback stream if possible */
if (! snd_pcm_playback_empty(substream)) {
snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
} else {
runtime->status->state = SNDRV_PCM_STATE_SETUP;
}
break;
case SNDRV_PCM_STATE_RUNNING:
runtime->status->state = SNDRV_PCM_STATE_DRAINING;
break;
case SNDRV_PCM_STATE_XRUN:
runtime->status->state = SNDRV_PCM_STATE_SETUP;
break;
default:
break;
}
} else {
/* stop running stream */
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
snd_pcm_state_t new_state;
new_state = snd_pcm_capture_avail(runtime) > 0 ?
SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
snd_pcm_do_stop(substream, new_state);
snd_pcm_post_stop(substream, new_state);
}
}
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
runtime->trigger_master == substream &&
(runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
return substream->ops->trigger(substream,
SNDRV_PCM_TRIGGER_DRAIN);
return 0;
}
static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
}
static const struct action_ops snd_pcm_action_drain_init = {
.pre_action = snd_pcm_pre_drain_init,
.do_action = snd_pcm_do_drain_init,
.post_action = snd_pcm_post_drain_init
};
/*
* Drain the stream(s).
* When the substream is linked, sync until the draining of all playback streams
* is finished.
* After this call, all streams are supposed to be either SETUP or DRAINING
* (capture only) state.
*/
static int snd_pcm_drain(struct snd_pcm_substream *substream,
struct file *file)
{
struct snd_card *card;
struct snd_pcm_runtime *runtime;
struct snd_pcm_substream *s;
struct snd_pcm_group *group;
wait_queue_entry_t wait;
int result = 0;
int nonblock = 0;
card = substream->pcm->card;
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (file) {
if (file->f_flags & O_NONBLOCK)
nonblock = 1;
} else if (substream->f_flags & O_NONBLOCK)
nonblock = 1;
snd_pcm_stream_lock_irq(substream);
/* resume pause */
if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
snd_pcm_pause(substream, false);
/* pre-start/stop - all running streams are changed to DRAINING state */
result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
ACTION_ARG_IGNORE);
if (result < 0)
goto unlock;
/* in non-blocking, we don't wait in ioctl but let caller poll */
if (nonblock) {
result = -EAGAIN;
goto unlock;
}
for (;;) {
long tout;
struct snd_pcm_runtime *to_check;
if (signal_pending(current)) {
result = -ERESTARTSYS;
break;
}
/* find a substream to drain */
to_check = NULL;
group = snd_pcm_stream_group_ref(substream);
snd_pcm_group_for_each_entry(s, substream) {
if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
continue;
runtime = s->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
to_check = runtime;
break;
}
}
snd_pcm_group_unref(group, substream);
if (!to_check)
break; /* all drained */
init_waitqueue_entry(&wait, current);
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&to_check->sleep, &wait);
snd_pcm_stream_unlock_irq(substream);
if (runtime->no_period_wakeup)
tout = MAX_SCHEDULE_TIMEOUT;
else {
tout = 10;
if (runtime->rate) {
long t = runtime->period_size * 2 / runtime->rate;
tout = max(t, tout);
}
tout = msecs_to_jiffies(tout * 1000);
}
tout = schedule_timeout(tout);
snd_pcm_stream_lock_irq(substream);
group = snd_pcm_stream_group_ref(substream);
snd_pcm_group_for_each_entry(s, substream) {
if (s->runtime == to_check) {
remove_wait_queue(&to_check->sleep, &wait);
break;
}
}
snd_pcm_group_unref(group, substream);
if (card->shutdown) {
result = -ENODEV;
break;
}
if (tout == 0) {
if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
result = -ESTRPIPE;
else {
dev_dbg(substream->pcm->card->dev,
"playback drain error (DMA or IRQ trouble?)\n");
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
result = -EIO;
}
break;
}
}
unlock:
snd_pcm_stream_unlock_irq(substream);
return result;
}
/*
* drop ioctl
*
* Immediately put all linked substreams into SETUP state.
*/
static int snd_pcm_drop(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
int result = 0;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
return -EBADFD;
snd_pcm_stream_lock_irq(substream);
/* resume pause */
if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
snd_pcm_pause(substream, false);
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
/* runtime->control->appl_ptr = runtime->status->hw_ptr; */
snd_pcm_stream_unlock_irq(substream);
return result;
}
static bool is_pcm_file(struct file *file)
{
struct inode *inode = file_inode(file);
struct snd_pcm *pcm;
unsigned int minor;
if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
return false;
minor = iminor(inode);
pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
if (!pcm)
pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
if (!pcm)
return false;
snd_card_unref(pcm->card);
return true;
}
/*
* PCM link handling
*/
static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
{
int res = 0;
struct snd_pcm_file *pcm_file;
struct snd_pcm_substream *substream1;
struct snd_pcm_group *group, *target_group;
bool nonatomic = substream->pcm->nonatomic;
struct fd f = fdget(fd);
if (!f.file)
return -EBADFD;
if (!is_pcm_file(f.file)) {
res = -EBADFD;
goto _badf;
}
pcm_file = f.file->private_data;
substream1 = pcm_file->substream;
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group) {
res = -ENOMEM;
goto _nolock;
}
snd_pcm_group_init(group);
down_write(&snd_pcm_link_rwsem);
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
substream->runtime->status->state != substream1->runtime->status->state ||
substream->pcm->nonatomic != substream1->pcm->nonatomic) {
res = -EBADFD;
goto _end;
}
if (snd_pcm_stream_linked(substream1)) {
res = -EALREADY;
goto _end;
}
snd_pcm_stream_lock_irq(substream);
if (!snd_pcm_stream_linked(substream)) {
snd_pcm_group_assign(substream, group);
group = NULL; /* assigned, don't free this one below */
}
target_group = substream->group;
snd_pcm_stream_unlock_irq(substream);
snd_pcm_group_lock_irq(target_group, nonatomic);
snd_pcm_stream_lock(substream1);
snd_pcm_group_assign(substream1, target_group);
refcount_inc(&target_group->refs);
snd_pcm_stream_unlock(substream1);
snd_pcm_group_unlock_irq(target_group, nonatomic);
_end:
up_write(&snd_pcm_link_rwsem);
_nolock:
kfree(group);
_badf:
fdput(f);
return res;
}
static void relink_to_local(struct snd_pcm_substream *substream)
{
snd_pcm_stream_lock(substream);
snd_pcm_group_assign(substream, &substream->self_group);
snd_pcm_stream_unlock(substream);
}
static int snd_pcm_unlink(struct snd_pcm_substream *substream)
{
struct snd_pcm_group *group;
bool nonatomic = substream->pcm->nonatomic;
bool do_free = false;
int res = 0;
down_write(&snd_pcm_link_rwsem);
if (!snd_pcm_stream_linked(substream)) {
res = -EALREADY;
goto _end;
}
group = substream->group;
snd_pcm_group_lock_irq(group, nonatomic);
relink_to_local(substream);
refcount_dec(&group->refs);
/* detach the last stream, too */
if (list_is_singular(&group->substreams)) {
relink_to_local(list_first_entry(&group->substreams,
struct snd_pcm_substream,
link_list));
do_free = refcount_dec_and_test(&group->refs);
}
snd_pcm_group_unlock_irq(group, nonatomic);
if (do_free)
kfree(group);
_end:
up_write(&snd_pcm_link_rwsem);
return res;
}
/*
* hw configurator
*/
static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval t;
snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
hw_param_interval_c(params, rule->deps[1]), &t);
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval t;
snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
hw_param_interval_c(params, rule->deps[1]), &t);
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval t;
snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
hw_param_interval_c(params, rule->deps[1]),
(unsigned long) rule->private, &t);
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval t;
snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
(unsigned long) rule->private,
hw_param_interval_c(params, rule->deps[1]), &t);
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
unsigned int k;
const struct snd_interval *i =
hw_param_interval_c(params, rule->deps[0]);
struct snd_mask m;
struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
snd_mask_any(&m);
for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
int bits;
if (! snd_mask_test(mask, k))
continue;
bits = snd_pcm_format_physical_width(k);
if (bits <= 0)
continue; /* ignore invalid formats */
if ((unsigned)bits < i->min || (unsigned)bits > i->max)
snd_mask_reset(&m, k);
}
return snd_mask_refine(mask, &m);
}
static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval t;
unsigned int k;
t.min = UINT_MAX;
t.max = 0;
t.openmin = 0;
t.openmax = 0;
for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
int bits;
if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
continue;
bits = snd_pcm_format_physical_width(k);
if (bits <= 0)
continue; /* ignore invalid formats */
if (t.min > (unsigned)bits)
t.min = bits;
if (t.max < (unsigned)bits)
t.max = bits;
}
t.integer = 1;
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
#error "Change this table"
#endif
static const unsigned int rates[] = {
5512, 8000, 11025, 16000, 22050, 32000, 44100,
48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
};
const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
.count = ARRAY_SIZE(rates),
.list = rates,
};
static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_pcm_hardware *hw = rule->private;
return snd_interval_list(hw_param_interval(params, rule->var),
snd_pcm_known_rates.count,
snd_pcm_known_rates.list, hw->rates);
}
static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval t;
struct snd_pcm_substream *substream = rule->private;
t.min = 0;
t.max = substream->buffer_bytes_max;
t.openmin = 0;
t.openmax = 0;
t.integer = 1;
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
int k, err;
for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
snd_mask_any(constrs_mask(constrs, k));
}
for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
snd_interval_any(constrs_interval(constrs, k));
}
snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
snd_pcm_hw_rule_format, NULL,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
snd_pcm_hw_rule_sample_bits, NULL,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
snd_pcm_hw_rule_div, NULL,
SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
snd_pcm_hw_rule_mul, NULL,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
snd_pcm_hw_rule_mulkdiv, (void*) 8,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
snd_pcm_hw_rule_mulkdiv, (void*) 8,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
snd_pcm_hw_rule_div, NULL,
SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
snd_pcm_hw_rule_div, NULL,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
snd_pcm_hw_rule_div, NULL,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
snd_pcm_hw_rule_mulkdiv, (void*) 8,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
snd_pcm_hw_rule_muldivk, (void*) 1000000,
SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
snd_pcm_hw_rule_mul, NULL,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
snd_pcm_hw_rule_mulkdiv, (void*) 8,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
snd_pcm_hw_rule_muldivk, (void*) 1000000,
SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
snd_pcm_hw_rule_muldivk, (void*) 8,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
snd_pcm_hw_rule_muldivk, (void*) 8,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
return 0;
}
static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hardware *hw = &runtime->hw;
int err;
unsigned int mask = 0;
if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
if (hw_support_mmap(substream)) {
if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
if (hw->info & SNDRV_PCM_INFO_COMPLEX)
mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
}
err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
hw->channels_min, hw->channels_max);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
hw->rate_min, hw->rate_max);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
hw->period_bytes_min, hw->period_bytes_max);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
hw->periods_min, hw->periods_max);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
hw->period_bytes_min, hw->buffer_bytes_max);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
snd_pcm_hw_rule_buffer_bytes_max, substream,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
if (err < 0)
return err;
/* FIXME: remove */
if (runtime->dma_bytes) {
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
if (err < 0)
return err;
}
if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
snd_pcm_hw_rule_rate, hw,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
}
/* FIXME: this belong to lowlevel */
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
return 0;
}
static void pcm_release_private(struct snd_pcm_substream *substream)
{
if (snd_pcm_stream_linked(substream))
snd_pcm_unlink(substream);
}
void snd_pcm_release_substream(struct snd_pcm_substream *substream)
{
substream->ref_count--;
if (substream->ref_count > 0)
return;
snd_pcm_drop(substream);
if (substream->hw_opened) {
if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
do_hw_free(substream);
substream->ops->close(substream);
substream->hw_opened = 0;
}
if (pm_qos_request_active(&substream->latency_pm_qos_req))
pm_qos_remove_request(&substream->latency_pm_qos_req);
if (substream->pcm_release) {
substream->pcm_release(substream);
substream->pcm_release = NULL;
}
snd_pcm_detach_substream(substream);
}
EXPORT_SYMBOL(snd_pcm_release_substream);
int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
struct file *file,
struct snd_pcm_substream **rsubstream)
{
struct snd_pcm_substream *substream;
int err;
err = snd_pcm_attach_substream(pcm, stream, file, &substream);
if (err < 0)
return err;
if (substream->ref_count > 1) {
*rsubstream = substream;
return 0;
}
err = snd_pcm_hw_constraints_init(substream);
if (err < 0) {
pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
goto error;
}
if ((err = substream->ops->open(substream)) < 0)
goto error;
substream->hw_opened = 1;
err = snd_pcm_hw_constraints_complete(substream);
if (err < 0) {
pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
goto error;
}
*rsubstream = substream;
return 0;
error:
snd_pcm_release_substream(substream);
return err;
}
EXPORT_SYMBOL(snd_pcm_open_substream);
static int snd_pcm_open_file(struct file *file,
struct snd_pcm *pcm,
int stream)
{
struct snd_pcm_file *pcm_file;
struct snd_pcm_substream *substream;
int err;
err = snd_pcm_open_substream(pcm, stream, file, &substream);
if (err < 0)
return err;
pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
if (pcm_file == NULL) {
snd_pcm_release_substream(substream);
return -ENOMEM;
}
pcm_file->substream = substream;
if (substream->ref_count == 1)
substream->pcm_release = pcm_release_private;
file->private_data = pcm_file;
return 0;
}
static int snd_pcm_playback_open(struct inode *inode, struct file *file)
{
struct snd_pcm *pcm;
int err = nonseekable_open(inode, file);
if (err < 0)
return err;
pcm = snd_lookup_minor_data(iminor(inode),
SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
if (pcm)
snd_card_unref(pcm->card);
return err;
}
static int snd_pcm_capture_open(struct inode *inode, struct file *file)
{
struct snd_pcm *pcm;
int err = nonseekable_open(inode, file);
if (err < 0)
return err;
pcm = snd_lookup_minor_data(iminor(inode),
SNDRV_DEVICE_TYPE_PCM_CAPTURE);
err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
if (pcm)
snd_card_unref(pcm->card);
return err;
}
static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
{
int err;
wait_queue_entry_t wait;
if (pcm == NULL) {
err = -ENODEV;
goto __error1;
}
err = snd_card_file_add(pcm->card, file);
if (err < 0)
goto __error1;
if (!try_module_get(pcm->card->module)) {
err = -EFAULT;
goto __error2;