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pcm_native.c
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/*
* Digital Audio (PCM) abstract layer
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/pm_qos.h>
#include <linux/aio.h>
#include <linux/dma-mapping.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 <asm/io.h>
#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
#include <dma-coherence.h>
#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 DEFINE_RWLOCK(snd_pcm_link_rwlock);
static DECLARE_RWSEM(snd_pcm_link_rwsem);
void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
{
if (substream->pcm->nonatomic) {
down_read(&snd_pcm_link_rwsem);
mutex_lock(&substream->self_group.mutex);
} else {
read_lock(&snd_pcm_link_rwlock);
spin_lock(&substream->self_group.lock);
}
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
{
if (substream->pcm->nonatomic) {
mutex_unlock(&substream->self_group.mutex);
up_read(&snd_pcm_link_rwsem);
} else {
spin_unlock(&substream->self_group.lock);
read_unlock(&snd_pcm_link_rwlock);
}
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
{
if (!substream->pcm->nonatomic)
local_irq_disable();
snd_pcm_stream_lock(substream);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
{
snd_pcm_stream_unlock(substream);
if (!substream->pcm->nonatomic)
local_irq_enable();
}
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)
local_irq_save(flags);
snd_pcm_stream_lock(substream);
return flags;
}
EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
unsigned long flags)
{
snd_pcm_stream_unlock(substream);
if (!substream->pcm->nonatomic)
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
static inline mm_segment_t snd_enter_user(void)
{
mm_segment_t fs = get_fs();
set_fs(get_ds());
return fs;
}
static inline void snd_leave_user(mm_segment_t fs)
{
set_fs(fs);
}
int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
{
struct snd_pcm_runtime *runtime;
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));
runtime = substream->runtime;
/* AB: FIXME!!! This is definitely nonsense */
if (runtime) {
info->sync = runtime->sync;
substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
}
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;
}
#undef RULES_DEBUG
#ifdef RULES_DEBUG
#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
static const char * const snd_pcm_hw_param_names[] = {
HW_PARAM(ACCESS),
HW_PARAM(FORMAT),
HW_PARAM(SUBFORMAT),
HW_PARAM(SAMPLE_BITS),
HW_PARAM(FRAME_BITS),
HW_PARAM(CHANNELS),
HW_PARAM(RATE),
HW_PARAM(PERIOD_TIME),
HW_PARAM(PERIOD_SIZE),
HW_PARAM(PERIOD_BYTES),
HW_PARAM(PERIODS),
HW_PARAM(BUFFER_TIME),
HW_PARAM(BUFFER_SIZE),
HW_PARAM(BUFFER_BYTES),
HW_PARAM(TICK_TIME),
};
#endif
int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
unsigned int k;
struct snd_pcm_hardware *hw;
struct snd_interval *i = NULL;
struct snd_mask *m = NULL;
struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
unsigned int rstamps[constrs->rules_num];
unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
unsigned int stamp = 2;
int changed, again;
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;
}
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;
if (!(params->rmask & (1 << k)))
continue;
#ifdef RULES_DEBUG
pr_debug("%s = ", snd_pcm_hw_param_names[k]);
pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
#endif
changed = snd_mask_refine(m, constrs_mask(constrs, k));
#ifdef RULES_DEBUG
pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
#endif
if (changed)
params->cmask |= 1 << k;
if (changed < 0)
return 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;
if (!(params->rmask & (1 << k)))
continue;
#ifdef RULES_DEBUG
pr_debug("%s = ", snd_pcm_hw_param_names[k]);
if (i->empty)
pr_cont("empty");
else
pr_cont("%c%u %u%c",
i->openmin ? '(' : '[', i->min,
i->max, i->openmax ? ')' : ']');
pr_cont(" -> ");
#endif
changed = snd_interval_refine(i, constrs_interval(constrs, k));
#ifdef RULES_DEBUG
if (i->empty)
pr_cont("empty\n");
else
pr_cont("%c%u %u%c\n",
i->openmin ? '(' : '[', i->min,
i->max, i->openmax ? ')' : ']');
#endif
if (changed)
params->cmask |= 1 << k;
if (changed < 0)
return changed;
}
for (k = 0; k < constrs->rules_num; k++)
rstamps[k] = 0;
for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
do {
again = 0;
for (k = 0; k < constrs->rules_num; k++) {
struct snd_pcm_hw_rule *r = &constrs->rules[k];
unsigned int d;
int doit = 0;
if (r->cond && !(r->cond & params->flags))
continue;
for (d = 0; r->deps[d] >= 0; d++) {
if (vstamps[r->deps[d]] > rstamps[k]) {
doit = 1;
break;
}
}
if (!doit)
continue;
#ifdef RULES_DEBUG
pr_debug("Rule %d [%p]: ", k, r->func);
if (r->var >= 0) {
pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
if (hw_is_mask(r->var)) {
m = hw_param_mask(params, r->var);
pr_cont("%x", *m->bits);
} else {
i = hw_param_interval(params, r->var);
if (i->empty)
pr_cont("empty");
else
pr_cont("%c%u %u%c",
i->openmin ? '(' : '[', i->min,
i->max, i->openmax ? ')' : ']');
}
}
#endif
changed = r->func(params, r);
#ifdef RULES_DEBUG
if (r->var >= 0) {
pr_cont(" -> ");
if (hw_is_mask(r->var))
pr_cont("%x", *m->bits);
else {
if (i->empty)
pr_cont("empty");
else
pr_cont("%c%u %u%c",
i->openmin ? '(' : '[', i->min,
i->max, i->openmax ? ')' : ']');
}
}
pr_cont("\n");
#endif
rstamps[k] = stamp;
if (changed && r->var >= 0) {
params->cmask |= (1 << r->var);
vstamps[r->var] = stamp;
again = 1;
}
if (changed < 0)
return changed;
stamp++;
}
} while (again);
if (!params->msbits) {
i = hw_param_interval(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(params, SNDRV_PCM_HW_PARAM_RATE);
if (snd_interval_single(i)) {
params->rate_num = snd_interval_value(i);
params->rate_den = 1;
}
}
hw = &substream->runtime->hw;
if (!params->info)
params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
if (!params->fifo_size) {
m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
if (snd_mask_min(m) == snd_mask_max(m) &&
snd_interval_min(i) == snd_interval_max(i)) {
changed = substream->ops->ioctl(substream,
SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
if (changed < 0)
return changed;
}
}
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 (copy_to_user(_params, params, sizeof(*params))) {
if (!err)
err = -EFAULT;
}
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, int 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 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;
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;
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;
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);
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 (copy_to_user(_params, params, sizeof(*params))) {
if (!err)
err = -EFAULT;
}
kfree(params);
return err;
}
static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
int result = 0;
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;
if (substream->ops->hw_free)
result = substream->ops->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 > 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(¶ms, _params, sizeof(params)))
return -EFAULT;
err = snd_pcm_sw_params(substream, ¶ms);
if (copy_to_user(_params, ¶ms, sizeof(params)))
return -EFAULT;
return err;
}
int snd_pcm_status(struct snd_pcm_substream *substream,
struct snd_pcm_status *status)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
status->state = runtime->status->state;
status->suspended_state = runtime->status->suspended_state;
if (status->state == SNDRV_PCM_STATE_OPEN)
goto _end;
status->trigger_tstamp = runtime->trigger_tstamp;
if (snd_pcm_running(substream)) {
snd_pcm_update_hw_ptr(substream);
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
status->tstamp = runtime->status->tstamp;
status->audio_tstamp =
runtime->status->audio_tstamp;
goto _tstamp_end;
}
}
snd_pcm_gettime(runtime, &status->tstamp);
_tstamp_end:
status->appl_ptr = runtime->control->appl_ptr;
status->hw_ptr = runtime->status->hw_ptr;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
status->avail = snd_pcm_playback_avail(runtime);
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
status->delay = runtime->buffer_size - status->avail;
status->delay += runtime->delay;
} else
status->delay = 0;
} else {
status->avail = snd_pcm_capture_avail(runtime);
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
status->delay = status->avail + runtime->delay;
else
status->delay = 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_user(struct snd_pcm_substream *substream,
struct snd_pcm_status __user * _status)
{
struct snd_pcm_status status;
int res;
memset(&status, 0, sizeof(status));
res = snd_pcm_status(substream, &status);
if (res < 0)
return res;
if (copy_to_user(_status, &status, sizeof(status)))
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 substream->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) {
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;
}
struct action_ops {
int (*pre_action)(struct snd_pcm_substream *substream, int state);
int (*do_action)(struct snd_pcm_substream *substream, int state);
void (*undo_action)(struct snd_pcm_substream *substream, int state);
void (*post_action)(struct snd_pcm_substream *substream, int 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(struct action_ops *ops,
struct snd_pcm_substream *substream,
int state, int do_lock)
{
struct snd_pcm_substream *s = NULL;
struct snd_pcm_substream *s1;
int res = 0;
snd_pcm_group_for_each_entry(s, substream) {
if (do_lock && s != substream) {
if (s->pcm->nonatomic)
mutex_lock_nested(&s->self_group.mutex,
SINGLE_DEPTH_NESTING);
else
spin_lock_nested(&s->self_group.lock,
SINGLE_DEPTH_NESTING);
}
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(struct action_ops *ops,
struct snd_pcm_substream *substream,
int 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;
}
/* call in mutex-protected context */
static int snd_pcm_action_mutex(struct action_ops *ops,
struct snd_pcm_substream *substream,
int state)
{
int res;
if (snd_pcm_stream_linked(substream)) {
if (!mutex_trylock(&substream->group->mutex)) {
mutex_unlock(&substream->self_group.mutex);
mutex_lock(&substream->group->mutex);
mutex_lock(&substream->self_group.mutex);
}
res = snd_pcm_action_group(ops, substream, state, 1);
mutex_unlock(&substream->group->mutex);
} else {
res = snd_pcm_action_single(ops, substream, state);
}
return res;
}
/*
* Note: call with stream lock
*/
static int snd_pcm_action(struct action_ops *ops,
struct snd_pcm_substream *substream,
int state)
{
int res;
if (substream->pcm->nonatomic)
return snd_pcm_action_mutex(ops, substream, state);
if (snd_pcm_stream_linked(substream)) {
if (!spin_trylock(&substream->group->lock)) {
spin_unlock(&substream->self_group.lock);
spin_lock(&substream->group->lock);
spin_lock(&substream->self_group.lock);
}
res = snd_pcm_action_group(ops, substream, state, 1);
spin_unlock(&substream->group->lock);
} else {
res = snd_pcm_action_single(ops, substream, state);
}
return res;
}
static int snd_pcm_action_lock_mutex(struct action_ops *ops,
struct snd_pcm_substream *substream,
int state)
{
int res;
down_read(&snd_pcm_link_rwsem);
if (snd_pcm_stream_linked(substream)) {
mutex_lock(&substream->group->mutex);
mutex_lock_nested(&substream->self_group.mutex,
SINGLE_DEPTH_NESTING);
res = snd_pcm_action_group(ops, substream, state, 1);
mutex_unlock(&substream->self_group.mutex);
mutex_unlock(&substream->group->mutex);
} else {
mutex_lock(&substream->self_group.mutex);
res = snd_pcm_action_single(ops, substream, state);
mutex_unlock(&substream->self_group.mutex);
}
up_read(&snd_pcm_link_rwsem);
return res;
}
/*
* Note: don't use any locks before
*/
static int snd_pcm_action_lock_irq(struct action_ops *ops,
struct snd_pcm_substream *substream,
int state)
{
int res;
if (substream->pcm->nonatomic)
return snd_pcm_action_lock_mutex(ops, substream, state);
read_lock_irq(&snd_pcm_link_rwlock);
if (snd_pcm_stream_linked(substream)) {
spin_lock(&substream->group->lock);
spin_lock(&substream->self_group.lock);
res = snd_pcm_action_group(ops, substream, state, 1);
spin_unlock(&substream->self_group.lock);
spin_unlock(&substream->group->lock);
} else {
spin_lock(&substream->self_group.lock);
res = snd_pcm_action_single(ops, substream, state);
spin_unlock(&substream->self_group.lock);
}
read_unlock_irq(&snd_pcm_link_rwlock);
return res;
}
/*
*/
static int snd_pcm_action_nonatomic(struct action_ops *ops,
struct snd_pcm_substream *substream,
int state)
{
int res;
down_read(&snd_pcm_link_rwsem);
if (snd_pcm_stream_linked(substream))
res = snd_pcm_action_group(ops, substream, state, 0);
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, int 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_master = substream;
return 0;
}
static int snd_pcm_do_start(struct snd_pcm_substream *substream, int 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, int 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, int state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
runtime->hw_ptr_jiffies = jiffies;