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kernel-fxtec-pro1x/sound/core/pcm_native.c
Takashi Iwai 21cb2a2ec5 [ALSA] Fix races between PCM drain and other ops 
PCM Midlevel
Fix semaphore races between PCM drain and other ops.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2005-06-22 12:27:53 +02:00

3366 lines
91 KiB
C
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/*
* Digital Audio (PCM) abstract layer
* Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/uio.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>
/*
* Compatibility
*/
struct sndrv_pcm_hw_params_old {
unsigned int flags;
unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
SNDRV_PCM_HW_PARAM_ACCESS + 1];
struct sndrv_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;
sndrv_pcm_uframes_t fifo_size;
unsigned char reserved[64];
};
#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct sndrv_pcm_hw_params_old)
#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct sndrv_pcm_hw_params_old)
static int snd_pcm_hw_refine_old_user(snd_pcm_substream_t * substream, struct sndrv_pcm_hw_params_old __user * _oparams);
static int snd_pcm_hw_params_old_user(snd_pcm_substream_t * substream, struct sndrv_pcm_hw_params_old __user * _oparams);
/*
*
*/
DEFINE_RWLOCK(snd_pcm_link_rwlock);
static DECLARE_RWSEM(snd_pcm_link_rwsem);
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(snd_pcm_substream_t * substream, snd_pcm_info_t *info)
{
snd_pcm_runtime_t * runtime;
snd_pcm_t *pcm = substream->pcm;
snd_pcm_str_t *pstr = substream->pstr;
snd_assert(substream != NULL, return -ENXIO);
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(snd_pcm_substream_t * substream, snd_pcm_info_t __user * _info)
{
snd_pcm_info_t *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
char *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(snd_pcm_substream_t *substream,
snd_pcm_hw_params_t *params)
{
unsigned int k;
snd_pcm_hardware_t *hw;
snd_interval_t *i = NULL;
snd_mask_t *m = NULL;
snd_pcm_hw_constraints_t *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
printk("%s = ", snd_pcm_hw_param_names[k]);
printk("%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
printk("%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
printk("%s = ", snd_pcm_hw_param_names[k]);
if (i->empty)
printk("empty");
else
printk("%c%u %u%c",
i->openmin ? '(' : '[', i->min,
i->max, i->openmax ? ')' : ']');
printk(" -> ");
#endif
changed = snd_interval_refine(i, constrs_interval(constrs, k));
#ifdef RULES_DEBUG
if (i->empty)
printk("empty\n");
else
printk("%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++) {
snd_pcm_hw_rule_t *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
printk("Rule %d [%p]: ", k, r->func);
if (r->var >= 0) {
printk("%s = ", snd_pcm_hw_param_names[r->var]);
if (hw_is_mask(r->var)) {
m = hw_param_mask(params, r->var);
printk("%x", *m->bits);
} else {
i = hw_param_interval(params, r->var);
if (i->empty)
printk("empty");
else
printk("%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) {
printk(" -> ");
if (hw_is_mask(r->var))
printk("%x", *m->bits);
else {
if (i->empty)
printk("empty");
else
printk("%c%u %u%c",
i->openmin ? '(' : '[', i->min,
i->max, i->openmax ? ')' : ']');
}
}
printk("\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;
if (!params->fifo_size)
params->fifo_size = hw->fifo_size;
params->rmask = 0;
return 0;
}
static int snd_pcm_hw_refine_user(snd_pcm_substream_t * substream, snd_pcm_hw_params_t __user * _params)
{
snd_pcm_hw_params_t *params;
int err;
params = kmalloc(sizeof(*params), GFP_KERNEL);
if (!params) {
err = -ENOMEM;
goto out;
}
if (copy_from_user(params, _params, sizeof(*params))) {
err = -EFAULT;
goto out;
}
err = snd_pcm_hw_refine(substream, params);
if (copy_to_user(_params, params, sizeof(*params))) {
if (!err)
err = -EFAULT;
}
out:
kfree(params);
return err;
}
static int snd_pcm_hw_params(snd_pcm_substream_t *substream,
snd_pcm_hw_params_t *params)
{
snd_pcm_runtime_t *runtime;
int err;
unsigned int bits;
snd_pcm_uframes_t frames;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
snd_assert(runtime != NULL, return -ENXIO);
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 defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
if (!substream->oss.oss)
#endif
if (atomic_read(&runtime->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->tick_time = params_tick_time(params);
runtime->info = params->info;
runtime->rate_num = params->rate_num;
runtime->rate_den = params->rate_den;
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->sleep_min = 0;
runtime->control->avail_min = runtime->period_size;
runtime->xfer_align = 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);
runtime->status->state = SNDRV_PCM_STATE_SETUP;
return 0;
_error:
/* hardware might be unuseable from this time,
so we force application to retry to set
the correct hardware parameter settings */
runtime->status->state = SNDRV_PCM_STATE_OPEN;
if (substream->ops->hw_free != NULL)
substream->ops->hw_free(substream);
return err;
}
static int snd_pcm_hw_params_user(snd_pcm_substream_t * substream, snd_pcm_hw_params_t __user * _params)
{
snd_pcm_hw_params_t *params;
int err;
params = kmalloc(sizeof(*params), GFP_KERNEL);
if (!params) {
err = -ENOMEM;
goto out;
}
if (copy_from_user(params, _params, sizeof(*params))) {
err = -EFAULT;
goto out;
}
err = snd_pcm_hw_params(substream, params);
if (copy_to_user(_params, params, sizeof(*params))) {
if (!err)
err = -EFAULT;
}
out:
kfree(params);
return err;
}
static int snd_pcm_hw_free(snd_pcm_substream_t * substream)
{
snd_pcm_runtime_t *runtime;
int result = 0;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
snd_assert(runtime != NULL, return -ENXIO);
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(&runtime->mmap_count))
return -EBADFD;
if (substream->ops->hw_free)
result = substream->ops->hw_free(substream);
runtime->status->state = SNDRV_PCM_STATE_OPEN;
return result;
}
static int snd_pcm_sw_params(snd_pcm_substream_t * substream, snd_pcm_sw_params_t *params)
{
snd_pcm_runtime_t *runtime;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
snd_assert(runtime != NULL, return -ENXIO);
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->avail_min == 0)
return -EINVAL;
if (params->xfer_align == 0 ||
params->xfer_align % runtime->min_align != 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;
}
snd_pcm_stream_lock_irq(substream);
runtime->tstamp_mode = params->tstamp_mode;
runtime->sleep_min = params->sleep_min;
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;
runtime->xfer_align = params->xfer_align;
params->boundary = runtime->boundary;
if (snd_pcm_running(substream)) {
if (runtime->sleep_min)
snd_pcm_tick_prepare(substream);
else
snd_pcm_tick_set(substream, 0);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, ULONG_MAX);
wake_up(&runtime->sleep);
}
snd_pcm_stream_unlock_irq(substream);
return 0;
}
static int snd_pcm_sw_params_user(snd_pcm_substream_t * substream, snd_pcm_sw_params_t __user * _params)
{
snd_pcm_sw_params_t 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;
}
int snd_pcm_status(snd_pcm_substream_t *substream,
snd_pcm_status_t *status)
{
snd_pcm_runtime_t *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_MMAP)
status->tstamp = runtime->status->tstamp;
else
snd_timestamp_now(&status->tstamp, runtime->tstamp_timespec);
} else
snd_timestamp_now(&status->tstamp, runtime->tstamp_timespec);
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;
else
status->delay = 0;
} else {
status->avail = snd_pcm_capture_avail(runtime);
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
status->delay = status->avail;
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(snd_pcm_substream_t * substream, snd_pcm_status_t __user * _status)
{
snd_pcm_status_t status;
snd_pcm_runtime_t *runtime;
int res;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
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(snd_pcm_substream_t * substream, snd_pcm_channel_info_t * info)
{
snd_pcm_runtime_t *runtime;
unsigned int channel;
snd_assert(substream != NULL, return -ENXIO);
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(snd_pcm_substream_t * substream, snd_pcm_channel_info_t __user * _info)
{
snd_pcm_channel_info_t 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(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
if (runtime->trigger_master == NULL)
return;
if (runtime->trigger_master == substream) {
snd_timestamp_now(&runtime->trigger_tstamp, runtime->tstamp_timespec);
} 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)(snd_pcm_substream_t *substream, int state);
int (*do_action)(snd_pcm_substream_t *substream, int state);
void (*undo_action)(snd_pcm_substream_t *substream, int state);
void (*post_action)(snd_pcm_substream_t *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,
snd_pcm_substream_t *substream,
int state, int do_lock)
{
struct list_head *pos;
snd_pcm_substream_t *s = NULL;
snd_pcm_substream_t *s1;
int res = 0;
snd_pcm_group_for_each(pos, substream) {
s = snd_pcm_group_substream_entry(pos);
if (do_lock && s != substream)
spin_lock(&s->self_group.lock);
res = ops->pre_action(s, state);
if (res < 0)
goto _unlock;
}
snd_pcm_group_for_each(pos, substream) {
s = snd_pcm_group_substream_entry(pos);
res = ops->do_action(s, state);
if (res < 0) {
if (ops->undo_action) {
snd_pcm_group_for_each(pos, substream) {
s1 = snd_pcm_group_substream_entry(pos);
if (s1 == s) /* failed stream */
break;
ops->undo_action(s1, state);
}
}
s = NULL; /* unlock all */
goto _unlock;
}
}
snd_pcm_group_for_each(pos, substream) {
s = snd_pcm_group_substream_entry(pos);
ops->post_action(s, state);
}
_unlock:
if (do_lock) {
/* unlock streams */
snd_pcm_group_for_each(pos, substream) {
s1 = snd_pcm_group_substream_entry(pos);
if (s1 != substream)
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,
snd_pcm_substream_t *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;
}
/*
* Note: call with stream lock
*/
static int snd_pcm_action(struct action_ops *ops,
snd_pcm_substream_t *substream,
int state)
{
int res;
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;
}
/*
* Note: don't use any locks before
*/
static int snd_pcm_action_lock_irq(struct action_ops *ops,
snd_pcm_substream_t *substream,
int state)
{
int res;
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,
snd_pcm_substream_t *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(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *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(snd_pcm_substream_t *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(snd_pcm_substream_t *substream, int state)
{
if (substream->runtime->trigger_master == substream)
substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
}
static void snd_pcm_post_start(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
runtime->status->state = state;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, ULONG_MAX);
if (runtime->sleep_min)
snd_pcm_tick_prepare(substream);
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, &runtime->trigger_tstamp);
}
static 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.
*/
int snd_pcm_start(snd_pcm_substream_t *substream)
{
return snd_pcm_action(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
}
/*
* stop callbacks
*/
static int snd_pcm_pre_stop(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *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(snd_pcm_substream_t *substream, int 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(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
if (runtime->status->state != state) {
snd_pcm_trigger_tstamp(substream);
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, &runtime->trigger_tstamp);
runtime->status->state = state;
snd_pcm_tick_set(substream, 0);
}
wake_up(&runtime->sleep);
}
static 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.
* The state of each stream is changed to the given value after that unconditionally.
*/
int snd_pcm_stop(snd_pcm_substream_t *substream, int state)
{
return snd_pcm_action(&snd_pcm_action_stop, substream, state);
}
/**
* snd_pcm_drain_done
*
* Stop the DMA only when the given stream is playback.
* The state is changed to SETUP.
* Unlike snd_pcm_stop(), this affects only the given stream.
*/
int snd_pcm_drain_done(snd_pcm_substream_t *substream)
{
return snd_pcm_action_single(&snd_pcm_action_stop, substream, SNDRV_PCM_STATE_SETUP);
}
/*
* pause callbacks
*/
static int snd_pcm_pre_pause(snd_pcm_substream_t *substream, int push)
{
snd_pcm_runtime_t *runtime = substream->runtime;
if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
return -ENOSYS;
if (push) {
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(snd_pcm_substream_t *substream, int push)
{
if (substream->runtime->trigger_master != substream)
return 0;
return substream->ops->trigger(substream,
push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
}
static void snd_pcm_undo_pause(snd_pcm_substream_t *substream, int push)
{
if (substream->runtime->trigger_master == substream)
substream->ops->trigger(substream,
push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
SNDRV_PCM_TRIGGER_PAUSE_PUSH);
}
static void snd_pcm_post_pause(snd_pcm_substream_t *substream, int push)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
if (push) {
runtime->status->state = SNDRV_PCM_STATE_PAUSED;
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MPAUSE, &runtime->trigger_tstamp);
snd_pcm_tick_set(substream, 0);
wake_up(&runtime->sleep);
} else {
runtime->status->state = SNDRV_PCM_STATE_RUNNING;
if (runtime->sleep_min)
snd_pcm_tick_prepare(substream);
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MCONTINUE, &runtime->trigger_tstamp);
}
}
static 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(snd_pcm_substream_t *substream, int push)
{
return snd_pcm_action(&snd_pcm_action_pause, substream, push);
}
#ifdef CONFIG_PM
/* suspend */
static int snd_pcm_pre_suspend(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
return -EBUSY;
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_suspend(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *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(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MPAUSE, &runtime->trigger_tstamp);
runtime->status->suspended_state = runtime->status->state;
runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
snd_pcm_tick_set(substream, 0);
wake_up(&runtime->sleep);
}
static 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.
* After this call, all streams are changed to SUSPENDED state.
*/
int snd_pcm_suspend(snd_pcm_substream_t *substream)
{
int err;
unsigned long flags;
snd_pcm_stream_lock_irqsave(substream, flags);
err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
snd_pcm_stream_unlock_irqrestore(substream, flags);
return err;
}
/**
* snd_pcm_suspend_all
*
* Trigger SUSPEND to all substreams in the given pcm.
* After this call, all streams are changed to SUSPENDED state.
*/
int snd_pcm_suspend_all(snd_pcm_t *pcm)
{
snd_pcm_substream_t *substream;
int stream, err = 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;
err = snd_pcm_suspend(substream);
if (err < 0 && err != -EBUSY)
return err;
}
}
return 0;
}
/* resume */
static int snd_pcm_pre_resume(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
return -ENOSYS;
runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_resume(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *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(snd_pcm_substream_t *substream, int 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(snd_pcm_substream_t *substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MCONTINUE, &runtime->trigger_tstamp);
runtime->status->state = runtime->status->suspended_state;
if (runtime->sleep_min)
snd_pcm_tick_prepare(substream);
}
static 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(snd_pcm_substream_t *substream)
{
snd_card_t *card = substream->pcm->card;
int res;
snd_power_lock(card);
if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile)) >= 0)
res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
snd_power_unlock(card);
return res;
}
#else
static int snd_pcm_resume(snd_pcm_substream_t *substream)
{
return -ENOSYS;
}
#endif /* CONFIG_PM */
/*
* xrun ioctl
*
* Change the RUNNING stream(s) to XRUN state.
*/
static int snd_pcm_xrun(snd_pcm_substream_t *substream)
{
snd_card_t *card = substream->pcm->card;
snd_pcm_runtime_t *runtime = substream->runtime;
int result;
snd_power_lock(card);
if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
result = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile);
if (result < 0)
goto _unlock;
}
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:
result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
break;
default:
result = -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
_unlock:
snd_power_unlock(card);
return result;
}
/*
* reset ioctl
*/
static int snd_pcm_pre_reset(snd_pcm_substream_t * substream, int state)
{
snd_pcm_runtime_t *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(snd_pcm_substream_t * substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
if (err < 0)
return err;
// snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
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(snd_pcm_substream_t * substream, int state)
{
snd_pcm_runtime_t *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 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(snd_pcm_substream_t *substream)
{
return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
}
/*
* prepare ioctl
*/
static int snd_pcm_pre_prepare(snd_pcm_substream_t * substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (snd_pcm_running(substream))
return -EBUSY;
return 0;
}
static int snd_pcm_do_prepare(snd_pcm_substream_t * substream, int state)
{
int err;
err = substream->ops->prepare(substream);
if (err < 0)
return err;
return snd_pcm_do_reset(substream, 0);
}
static void snd_pcm_post_prepare(snd_pcm_substream_t * substream, int state)
{
snd_pcm_runtime_t *runtime = substream->runtime;
runtime->control->appl_ptr = runtime->status->hw_ptr;
runtime->status->state = SNDRV_PCM_STATE_PREPARED;
}
static 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
*/
int snd_pcm_prepare(snd_pcm_substream_t *substream)
{
int res;
snd_card_t *card = substream->pcm->card;
snd_power_lock(card);
if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile)) >= 0)
res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, substream, 0);
snd_power_unlock(card);
return res;
}
/*
* drain ioctl
*/
static int snd_pcm_pre_drain_init(snd_pcm_substream_t * substream, int state)
{
if (substream->ffile->f_flags & O_NONBLOCK)
return -EAGAIN;
substream->runtime->trigger_master = substream;
return 0;
}
static int snd_pcm_do_drain_init(snd_pcm_substream_t * substream, int state)
{
snd_pcm_runtime_t *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);
}
break;
case SNDRV_PCM_STATE_RUNNING:
runtime->status->state = SNDRV_PCM_STATE_DRAINING;
break;
default:
break;
}
} else {
/* stop running stream */
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
int state = snd_pcm_capture_avail(runtime) > 0 ?
SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
snd_pcm_do_stop(substream, state);
snd_pcm_post_stop(substream, state);
}
}
return 0;
}
static void snd_pcm_post_drain_init(snd_pcm_substream_t * substream, int state)
{
}
static 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
};
struct drain_rec {
snd_pcm_substream_t *substream;
wait_queue_t wait;
snd_pcm_uframes_t stop_threshold;
};
static int snd_pcm_drop(snd_pcm_substream_t *substream);
/*
* 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(snd_pcm_substream_t *substream)
{
snd_card_t *card;
snd_pcm_runtime_t *runtime;
struct list_head *pos;
int result = 0;
int i, num_drecs;
struct drain_rec *drec, drec_tmp, *d;
snd_assert(substream != NULL, return -ENXIO);
card = substream->pcm->card;
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
snd_power_lock(card);
if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
result = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile);
if (result < 0) {
snd_power_unlock(card);
return result;
}
}
/* allocate temporary record for drain sync */
down_read(&snd_pcm_link_rwsem);
if (snd_pcm_stream_linked(substream)) {
drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
if (! drec) {
up_read(&snd_pcm_link_rwsem);
snd_power_unlock(card);
return -ENOMEM;
}
} else
drec = &drec_tmp;
/* count only playback streams */
num_drecs = 0;
snd_pcm_group_for_each(pos, substream) {
snd_pcm_substream_t *s = snd_pcm_group_substream_entry(pos);
runtime = s->runtime;
if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
d = &drec[num_drecs++];
d->substream = s;
init_waitqueue_entry(&d->wait, current);
add_wait_queue(&runtime->sleep, &d->wait);
/* stop_threshold fixup to avoid endless loop when
* stop_threshold > buffer_size
*/
d->stop_threshold = runtime->stop_threshold;
if (runtime->stop_threshold > runtime->buffer_size)
runtime->stop_threshold = runtime->buffer_size;
}
}
up_read(&snd_pcm_link_rwsem);
if (! num_drecs)
goto _error;
snd_pcm_stream_lock_irq(substream);
/* resume pause */
if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
snd_pcm_pause(substream, 0);
/* pre-start/stop - all running streams are changed to DRAINING state */
result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
if (result < 0) {
snd_pcm_stream_unlock_irq(substream);
goto _error;
}
for (;;) {
long tout;
if (signal_pending(current)) {
result = -ERESTARTSYS;
break;
}
/* all finished? */
for (i = 0; i < num_drecs; i++) {
runtime = drec[i].substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
break;
}
if (i == num_drecs)
break; /* yes, all drained */
set_current_state(TASK_INTERRUPTIBLE);
snd_pcm_stream_unlock_irq(substream);
snd_power_unlock(card);
tout = schedule_timeout(10 * HZ);
snd_power_lock(card);
snd_pcm_stream_lock_irq(substream);
if (tout == 0) {
if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
result = -ESTRPIPE;
else {
snd_printd("playback drain error (DMA or IRQ trouble?)\n");
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
result = -EIO;
}
break;
}
}
snd_pcm_stream_unlock_irq(substream);
_error:
for (i = 0; i < num_drecs; i++) {
d = &drec[i];
runtime = d->substream->runtime;
remove_wait_queue(&runtime->sleep, &d->wait);
runtime->stop_threshold = d->stop_threshold;
}
if (drec != &drec_tmp)
kfree(drec);
snd_power_unlock(card);
return result;
}
/*
* drop ioctl
*
* Immediately put all linked substreams into SETUP state.
*/
static int snd_pcm_drop(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime;
snd_card_t *card;
int result = 0;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
card = substream->pcm->card;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
snd_power_lock(card);
if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
result = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile);
if (result < 0)
goto _unlock;
}
snd_pcm_stream_lock_irq(substream);
/* resume pause */
if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
snd_pcm_pause(substream, 0);
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
/* runtime->control->appl_ptr = runtime->status->hw_ptr; */
snd_pcm_stream_unlock_irq(substream);
_unlock:
snd_power_unlock(card);
return result;
}
/* WARNING: Don't forget to fput back the file */
extern int snd_major;
static struct file *snd_pcm_file_fd(int fd)
{
struct file *file;
struct inode *inode;
unsigned short minor;
file = fget(fd);
if (!file)
return NULL;
inode = file->f_dentry->d_inode;
if (!S_ISCHR(inode->i_mode) ||
imajor(inode) != snd_major) {
fput(file);
return NULL;
}
minor = iminor(inode);
if (minor >= 256 ||
minor % SNDRV_MINOR_DEVICES < SNDRV_MINOR_PCM_PLAYBACK) {
fput(file);
return NULL;
}
return file;
}
/*
* PCM link handling
*/
static int snd_pcm_link(snd_pcm_substream_t *substream, int fd)
{
int res = 0;
struct file *file;
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream1;
file = snd_pcm_file_fd(fd);
if (!file)
return -EBADFD;
pcm_file = file->private_data;
substream1 = pcm_file->substream;
down_write(&snd_pcm_link_rwsem);
write_lock_irq(&snd_pcm_link_rwlock);
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
substream->runtime->status->state != substream1->runtime->status->state) {
res = -EBADFD;
goto _end;
}
if (snd_pcm_stream_linked(substream1)) {
res = -EALREADY;
goto _end;
}
if (!snd_pcm_stream_linked(substream)) {
substream->group = kmalloc(sizeof(snd_pcm_group_t), GFP_ATOMIC);
if (substream->group == NULL) {
res = -ENOMEM;
goto _end;
}
spin_lock_init(&substream->group->lock);
INIT_LIST_HEAD(&substream->group->substreams);
list_add_tail(&substream->link_list, &substream->group->substreams);
substream->group->count = 1;
}
list_add_tail(&substream1->link_list, &substream->group->substreams);
substream->group->count++;
substream1->group = substream->group;
_end:
write_unlock_irq(&snd_pcm_link_rwlock);
up_write(&snd_pcm_link_rwsem);
fput(file);
return res;
}
static void relink_to_local(snd_pcm_substream_t *substream)
{
substream->group = &substream->self_group;
INIT_LIST_HEAD(&substream->self_group.substreams);
list_add_tail(&substream->link_list, &substream->self_group.substreams);
}
static int snd_pcm_unlink(snd_pcm_substream_t *substream)
{
struct list_head *pos;
int res = 0;
down_write(&snd_pcm_link_rwsem);
write_lock_irq(&snd_pcm_link_rwlock);
if (!snd_pcm_stream_linked(substream)) {
res = -EALREADY;
goto _end;
}
list_del(&substream->link_list);
substream->group->count--;
if (substream->group->count == 1) { /* detach the last stream, too */
snd_pcm_group_for_each(pos, substream) {
relink_to_local(snd_pcm_group_substream_entry(pos));
break;
}
kfree(substream->group);
}
relink_to_local(substream);
_end:
write_unlock_irq(&snd_pcm_link_rwlock);
up_write(&snd_pcm_link_rwsem);
return res;
}
/*
* hw configurator
*/
static int snd_pcm_hw_rule_mul(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
snd_interval_t 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(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
snd_interval_t 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(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
snd_interval_t 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(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
snd_interval_t 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(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
unsigned int k;
snd_interval_t *i = hw_param_interval(params, rule->deps[0]);
snd_mask_t m;
snd_mask_t *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(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
snd_interval_t 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 unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
48000, 64000, 88200, 96000, 176400, 192000 };
static int snd_pcm_hw_rule_rate(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
snd_pcm_hardware_t *hw = rule->private;
return snd_interval_list(hw_param_interval(params, rule->var),
ARRAY_SIZE(rates), rates, hw->rates);
}
static int snd_pcm_hw_rule_buffer_bytes_max(snd_pcm_hw_params_t *params,
snd_pcm_hw_rule_t *rule)
{
snd_interval_t t;
snd_pcm_substream_t *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);
}
int snd_pcm_hw_constraints_init(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_hw_constraints_t *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;
}
int snd_pcm_hw_constraints_complete(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_hardware_t *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->info & SNDRV_PCM_INFO_MMAP) {
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);
snd_assert(err >= 0, return -EINVAL);
err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
snd_assert(err >= 0, return -EINVAL);
err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
snd_assert(err >= 0, return -EINVAL);
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
hw->channels_min, hw->channels_max);
snd_assert(err >= 0, return -EINVAL);
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
hw->rate_min, hw->rate_max);
snd_assert(err >= 0, return -EINVAL);
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
hw->period_bytes_min, hw->period_bytes_max);
snd_assert(err >= 0, return -EINVAL);
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
hw->periods_min, hw->periods_max);
snd_assert(err >= 0, return -EINVAL);
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
hw->period_bytes_min, hw->buffer_bytes_max);
snd_assert(err >= 0, return -EINVAL);
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);
snd_assert(err >= 0, return -EINVAL);
}
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_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME,
1000000 / HZ, 1000000 / HZ);
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
return 0;
}
static void snd_pcm_add_file(snd_pcm_str_t *str,
snd_pcm_file_t *pcm_file)
{
pcm_file->next = str->files;
str->files = pcm_file;
}
static void snd_pcm_remove_file(snd_pcm_str_t *str,
snd_pcm_file_t *pcm_file)
{
snd_pcm_file_t * pcm_file1;
if (str->files == pcm_file) {
str->files = pcm_file->next;
} else {
pcm_file1 = str->files;
while (pcm_file1 && pcm_file1->next != pcm_file)
pcm_file1 = pcm_file1->next;
if (pcm_file1 != NULL)
pcm_file1->next = pcm_file->next;
}
}
static int snd_pcm_release_file(snd_pcm_file_t * pcm_file)
{
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
snd_pcm_str_t * str;
snd_assert(pcm_file != NULL, return -ENXIO);
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
str = substream->pstr;
snd_pcm_unlink(substream);
if (substream->open_flag) {
if (substream->ops->hw_free != NULL)
substream->ops->hw_free(substream);
substream->ops->close(substream);
substream->open_flag = 0;
}
substream->ffile = NULL;
snd_pcm_remove_file(str, pcm_file);
snd_pcm_release_substream(substream);
kfree(pcm_file);
return 0;
}
static int snd_pcm_open_file(struct file *file,
snd_pcm_t *pcm,
int stream,
snd_pcm_file_t **rpcm_file)
{
int err = 0;
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_str_t *str;
snd_assert(rpcm_file != NULL, return -EINVAL);
*rpcm_file = NULL;
pcm_file = kcalloc(1, sizeof(*pcm_file), GFP_KERNEL);
if (pcm_file == NULL) {
return -ENOMEM;
}
if ((err = snd_pcm_open_substream(pcm, stream, &substream)) < 0) {
kfree(pcm_file);
return err;
}
str = substream->pstr;
substream->file = pcm_file;
substream->no_mmap_ctrl = 0;
pcm_file->substream = substream;
snd_pcm_add_file(str, pcm_file);
err = snd_pcm_hw_constraints_init(substream);
if (err < 0) {
snd_printd("snd_pcm_hw_constraints_init failed\n");
snd_pcm_release_file(pcm_file);
return err;
}
if ((err = substream->ops->open(substream)) < 0) {
snd_pcm_release_file(pcm_file);
return err;
}
substream->open_flag = 1;
err = snd_pcm_hw_constraints_complete(substream);
if (err < 0) {
snd_printd("snd_pcm_hw_constraints_complete failed\n");
substream->ops->close(substream);
snd_pcm_release_file(pcm_file);
return err;
}
substream->ffile = file;
file->private_data = pcm_file;
*rpcm_file = pcm_file;
return 0;
}
static int snd_pcm_open(struct inode *inode, struct file *file)
{
int cardnum = SNDRV_MINOR_CARD(iminor(inode));
int device = SNDRV_MINOR_DEVICE(iminor(inode));
int err;
snd_pcm_t *pcm;
snd_pcm_file_t *pcm_file;
wait_queue_t wait;
snd_runtime_check(device >= SNDRV_MINOR_PCM_PLAYBACK && device < SNDRV_MINOR_DEVICES, return -ENXIO);
pcm = snd_pcm_devices[(cardnum * SNDRV_PCM_DEVICES) + (device % SNDRV_MINOR_PCMS)];
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;
}
init_waitqueue_entry(&wait, current);
add_wait_queue(&pcm->open_wait, &wait);
down(&pcm->open_mutex);
while (1) {
err = snd_pcm_open_file(file, pcm, device >= SNDRV_MINOR_PCM_CAPTURE ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK, &pcm_file);
if (err >= 0)
break;
if (err == -EAGAIN) {
if (file->f_flags & O_NONBLOCK) {
err = -EBUSY;
break;
}
} else
break;
set_current_state(TASK_INTERRUPTIBLE);
up(&pcm->open_mutex);
schedule();
down(&pcm->open_mutex);
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
}
}
remove_wait_queue(&pcm->open_wait, &wait);
up(&pcm->open_mutex);
if (err < 0)
goto __error;
return err;
__error:
module_put(pcm->card->module);
__error2:
snd_card_file_remove(pcm->card, file);
__error1:
return err;
}
static int snd_pcm_release(struct inode *inode, struct file *file)
{
snd_pcm_t *pcm;
snd_pcm_substream_t *substream;
snd_pcm_file_t *pcm_file;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
snd_assert(!atomic_read(&substream->runtime->mmap_count), );
pcm = substream->pcm;
snd_pcm_drop(substream);
fasync_helper(-1, file, 0, &substream->runtime->fasync);
down(&pcm->open_mutex);
snd_pcm_release_file(pcm_file);
up(&pcm->open_mutex);
wake_up(&pcm->open_wait);
module_put(pcm->card->module);
snd_card_file_remove(pcm->card, file);
return 0;
}
static snd_pcm_sframes_t snd_pcm_playback_rewind(snd_pcm_substream_t *substream, snd_pcm_uframes_t frames)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_sframes_t appl_ptr;
snd_pcm_sframes_t ret;
snd_pcm_sframes_t hw_avail;
if (frames == 0)
return 0;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_PREPARED:
break;
case SNDRV_PCM_STATE_DRAINING:
case SNDRV_PCM_STATE_RUNNING:
if (snd_pcm_update_hw_ptr(substream) >= 0)
break;
/* Fall through */
case SNDRV_PCM_STATE_XRUN:
ret = -EPIPE;
goto __end;
default:
ret = -EBADFD;
goto __end;
}
hw_avail = snd_pcm_playback_hw_avail(runtime);
if (hw_avail <= 0) {
ret = 0;
goto __end;
}
if (frames > (snd_pcm_uframes_t)hw_avail)
frames = hw_avail;
else
frames -= frames % runtime->xfer_align;
appl_ptr = runtime->control->appl_ptr - frames;
if (appl_ptr < 0)
appl_ptr += runtime->boundary;
runtime->control->appl_ptr = appl_ptr;
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
runtime->sleep_min)
snd_pcm_tick_prepare(substream);
ret = frames;
__end:
snd_pcm_stream_unlock_irq(substream);
return ret;
}
static snd_pcm_sframes_t snd_pcm_capture_rewind(snd_pcm_substream_t *substream, snd_pcm_uframes_t frames)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_sframes_t appl_ptr;
snd_pcm_sframes_t ret;
snd_pcm_sframes_t hw_avail;
if (frames == 0)
return 0;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_DRAINING:
break;
case SNDRV_PCM_STATE_RUNNING:
if (snd_pcm_update_hw_ptr(substream) >= 0)
break;
/* Fall through */
case SNDRV_PCM_STATE_XRUN:
ret = -EPIPE;
goto __end;
default:
ret = -EBADFD;
goto __end;
}
hw_avail = snd_pcm_capture_hw_avail(runtime);
if (hw_avail <= 0) {
ret = 0;
goto __end;
}
if (frames > (snd_pcm_uframes_t)hw_avail)
frames = hw_avail;
else
frames -= frames % runtime->xfer_align;
appl_ptr = runtime->control->appl_ptr - frames;
if (appl_ptr < 0)
appl_ptr += runtime->boundary;
runtime->control->appl_ptr = appl_ptr;
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
runtime->sleep_min)
snd_pcm_tick_prepare(substream);
ret = frames;
__end:
snd_pcm_stream_unlock_irq(substream);
return ret;
}
static snd_pcm_sframes_t snd_pcm_playback_forward(snd_pcm_substream_t *substream, snd_pcm_uframes_t frames)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_sframes_t appl_ptr;
snd_pcm_sframes_t ret;
snd_pcm_sframes_t avail;
if (frames == 0)
return 0;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_PAUSED:
break;
case SNDRV_PCM_STATE_DRAINING:
case SNDRV_PCM_STATE_RUNNING:
if (snd_pcm_update_hw_ptr(substream) >= 0)
break;
/* Fall through */
case SNDRV_PCM_STATE_XRUN:
ret = -EPIPE;
goto __end;
default:
ret = -EBADFD;
goto __end;
}
avail = snd_pcm_playback_avail(runtime);
if (avail <= 0) {
ret = 0;
goto __end;
}
if (frames > (snd_pcm_uframes_t)avail)
frames = avail;
else
frames -= frames % runtime->xfer_align;
appl_ptr = runtime->control->appl_ptr + frames;
if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
appl_ptr -= runtime->boundary;
runtime->control->appl_ptr = appl_ptr;
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
runtime->sleep_min)
snd_pcm_tick_prepare(substream);
ret = frames;
__end:
snd_pcm_stream_unlock_irq(substream);
return ret;
}
static snd_pcm_sframes_t snd_pcm_capture_forward(snd_pcm_substream_t *substream, snd_pcm_uframes_t frames)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_sframes_t appl_ptr;
snd_pcm_sframes_t ret;
snd_pcm_sframes_t avail;
if (frames == 0)
return 0;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_DRAINING:
case SNDRV_PCM_STATE_PAUSED:
break;
case SNDRV_PCM_STATE_RUNNING:
if (snd_pcm_update_hw_ptr(substream) >= 0)
break;
/* Fall through */
case SNDRV_PCM_STATE_XRUN:
ret = -EPIPE;
goto __end;
default:
ret = -EBADFD;
goto __end;
}
avail = snd_pcm_capture_avail(runtime);
if (avail <= 0) {
ret = 0;
goto __end;
}
if (frames > (snd_pcm_uframes_t)avail)
frames = avail;
else
frames -= frames % runtime->xfer_align;
appl_ptr = runtime->control->appl_ptr + frames;
if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
appl_ptr -= runtime->boundary;
runtime->control->appl_ptr = appl_ptr;
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
runtime->sleep_min)
snd_pcm_tick_prepare(substream);
ret = frames;
__end:
snd_pcm_stream_unlock_irq(substream);
return ret;
}
static int snd_pcm_hwsync(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
int err;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_DRAINING:
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
goto __badfd;
case SNDRV_PCM_STATE_RUNNING:
if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
break;
/* Fall through */
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_SUSPENDED:
err = 0;
break;
case SNDRV_PCM_STATE_XRUN:
err = -EPIPE;
break;
default:
__badfd:
err = -EBADFD;
break;
}
snd_pcm_stream_unlock_irq(substream);
return err;
}
static int snd_pcm_delay(snd_pcm_substream_t *substream, snd_pcm_sframes_t __user *res)
{
snd_pcm_runtime_t *runtime = substream->runtime;
int err;
snd_pcm_sframes_t n = 0;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_DRAINING:
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
goto __badfd;
case SNDRV_PCM_STATE_RUNNING:
if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
break;
/* Fall through */
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_SUSPENDED:
err = 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
n = snd_pcm_playback_hw_avail(runtime);
else
n = snd_pcm_capture_avail(runtime);
break;
case SNDRV_PCM_STATE_XRUN:
err = -EPIPE;
break;
default:
__badfd:
err = -EBADFD;
break;
}
snd_pcm_stream_unlock_irq(substream);
if (!err)
if (put_user(n, res))
err = -EFAULT;
return err;
}
static int snd_pcm_sync_ptr(snd_pcm_substream_t *substream, struct sndrv_pcm_sync_ptr __user *_sync_ptr)
{
snd_pcm_runtime_t *runtime = substream->runtime;
struct sndrv_pcm_sync_ptr sync_ptr;
volatile struct sndrv_pcm_mmap_status *status;
volatile struct sndrv_pcm_mmap_control *control;
int err;
memset(&sync_ptr, 0, sizeof(sync_ptr));
if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
return -EFAULT;
if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct sndrv_pcm_mmap_control)))
return -EFAULT;
status = runtime->status;
control = runtime->control;
if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
err = snd_pcm_hwsync(substream);
if (err < 0)
return err;
}
snd_pcm_stream_lock_irq(substream);
if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
control->appl_ptr = sync_ptr.c.control.appl_ptr;
else
sync_ptr.c.control.appl_ptr = control->appl_ptr;
if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
control->avail_min = sync_ptr.c.control.avail_min;
else
sync_ptr.c.control.avail_min = control->avail_min;
sync_ptr.s.status.state = status->state;
sync_ptr.s.status.hw_ptr = status->hw_ptr;
sync_ptr.s.status.tstamp = status->tstamp;
sync_ptr.s.status.suspended_state = status->suspended_state;
snd_pcm_stream_unlock_irq(substream);
if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
return -EFAULT;
return 0;
}
static int snd_pcm_playback_ioctl1(snd_pcm_substream_t *substream,
unsigned int cmd, void __user *arg);
static int snd_pcm_capture_ioctl1(snd_pcm_substream_t *substream,
unsigned int cmd, void __user *arg);
static int snd_pcm_common_ioctl1(snd_pcm_substream_t *substream,
unsigned int cmd, void __user *arg)
{
snd_assert(substream != NULL, return -ENXIO);
switch (cmd) {
case SNDRV_PCM_IOCTL_PVERSION:
return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
case SNDRV_PCM_IOCTL_INFO:
return snd_pcm_info_user(substream, arg);
case SNDRV_PCM_IOCTL_TSTAMP:
{
int xarg;
if (get_user(xarg, (int __user *)arg))
return -EFAULT;
substream->runtime->tstamp_timespec = xarg ? 1 : 0;
return 0;
}
case SNDRV_PCM_IOCTL_HW_REFINE:
return snd_pcm_hw_refine_user(substream, arg);
case SNDRV_PCM_IOCTL_HW_PARAMS:
return snd_pcm_hw_params_user(substream, arg);
case SNDRV_PCM_IOCTL_HW_FREE:
return snd_pcm_hw_free(substream);
case SNDRV_PCM_IOCTL_SW_PARAMS:
return snd_pcm_sw_params_user(substream, arg);
case SNDRV_PCM_IOCTL_STATUS:
return snd_pcm_status_user(substream, arg);
case SNDRV_PCM_IOCTL_CHANNEL_INFO:
return snd_pcm_channel_info_user(substream, arg);
case SNDRV_PCM_IOCTL_PREPARE:
return snd_pcm_prepare(substream);
case SNDRV_PCM_IOCTL_RESET:
return snd_pcm_reset(substream);
case SNDRV_PCM_IOCTL_START:
return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
case SNDRV_PCM_IOCTL_LINK:
return snd_pcm_link(substream, (int)(unsigned long) arg);
case SNDRV_PCM_IOCTL_UNLINK:
return snd_pcm_unlink(substream);
case SNDRV_PCM_IOCTL_RESUME:
return snd_pcm_resume(substream);
case SNDRV_PCM_IOCTL_XRUN:
return snd_pcm_xrun(substream);
case SNDRV_PCM_IOCTL_HWSYNC:
return snd_pcm_hwsync(substream);
case SNDRV_PCM_IOCTL_DELAY:
return snd_pcm_delay(substream, arg);
case SNDRV_PCM_IOCTL_SYNC_PTR:
return snd_pcm_sync_ptr(substream, arg);
case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
return snd_pcm_hw_refine_old_user(substream, arg);
case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
return snd_pcm_hw_params_old_user(substream, arg);
case SNDRV_PCM_IOCTL_DRAIN:
return snd_pcm_drain(substream);
case SNDRV_PCM_IOCTL_DROP:
return snd_pcm_drop(substream);
}
snd_printd("unknown ioctl = 0x%x\n", cmd);
return -ENOTTY;
}
static int snd_pcm_playback_ioctl1(snd_pcm_substream_t *substream,
unsigned int cmd, void __user *arg)
{
snd_assert(substream != NULL, return -ENXIO);
snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
switch (cmd) {
case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
{
snd_xferi_t xferi;
snd_xferi_t __user *_xferi = arg;
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_sframes_t result;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (put_user(0, &_xferi->result))
return -EFAULT;
if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
return -EFAULT;
result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
__put_user(result, &_xferi->result);
return result < 0 ? result : 0;
}
case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
{
snd_xfern_t xfern;
snd_xfern_t __user *_xfern = arg;
snd_pcm_runtime_t *runtime = substream->runtime;
void __user **bufs;
snd_pcm_sframes_t result;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (runtime->channels > 128)
return -EINVAL;
if (put_user(0, &_xfern->result))
return -EFAULT;
if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
return -EFAULT;
bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
if (bufs == NULL)
return -ENOMEM;
if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
kfree(bufs);
return -EFAULT;
}
result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
kfree(bufs);
__put_user(result, &_xfern->result);
return result < 0 ? result : 0;
}
case SNDRV_PCM_IOCTL_REWIND:
{
snd_pcm_uframes_t frames;
snd_pcm_uframes_t __user *_frames = arg;
snd_pcm_sframes_t result;
if (get_user(frames, _frames))
return -EFAULT;
if (put_user(0, _frames))
return -EFAULT;
result = snd_pcm_playback_rewind(substream, frames);
__put_user(result, _frames);
return result < 0 ? result : 0;
}
case SNDRV_PCM_IOCTL_FORWARD:
{
snd_pcm_uframes_t frames;
snd_pcm_uframes_t __user *_frames = arg;
snd_pcm_sframes_t result;
if (get_user(frames, _frames))
return -EFAULT;
if (put_user(0, _frames))
return -EFAULT;
result = snd_pcm_playback_forward(substream, frames);
__put_user(result, _frames);
return result < 0 ? result : 0;
}
case SNDRV_PCM_IOCTL_PAUSE:
{
int res;
snd_pcm_stream_lock_irq(substream);
res = snd_pcm_pause(substream, (int)(unsigned long)arg);
snd_pcm_stream_unlock_irq(substream);
return res;
}
}
return snd_pcm_common_ioctl1(substream, cmd, arg);
}
static int snd_pcm_capture_ioctl1(snd_pcm_substream_t *substream,
unsigned int cmd, void __user *arg)
{
snd_assert(substream != NULL, return -ENXIO);
snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
switch (cmd) {
case SNDRV_PCM_IOCTL_READI_FRAMES:
{
snd_xferi_t xferi;
snd_xferi_t __user *_xferi = arg;
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_sframes_t result;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (put_user(0, &_xferi->result))
return -EFAULT;
if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
return -EFAULT;
result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
__put_user(result, &_xferi->result);
return result < 0 ? result : 0;
}
case SNDRV_PCM_IOCTL_READN_FRAMES:
{
snd_xfern_t xfern;
snd_xfern_t __user *_xfern = arg;
snd_pcm_runtime_t *runtime = substream->runtime;
void *bufs;
snd_pcm_sframes_t result;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (runtime->channels > 128)
return -EINVAL;
if (put_user(0, &_xfern->result))
return -EFAULT;
if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
return -EFAULT;
bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
if (bufs == NULL)
return -ENOMEM;
if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
kfree(bufs);
return -EFAULT;
}
result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
kfree(bufs);
__put_user(result, &_xfern->result);
return result < 0 ? result : 0;
}
case SNDRV_PCM_IOCTL_REWIND:
{
snd_pcm_uframes_t frames;
snd_pcm_uframes_t __user *_frames = arg;
snd_pcm_sframes_t result;
if (get_user(frames, _frames))
return -EFAULT;
if (put_user(0, _frames))
return -EFAULT;
result = snd_pcm_capture_rewind(substream, frames);
__put_user(result, _frames);
return result < 0 ? result : 0;
}
case SNDRV_PCM_IOCTL_FORWARD:
{
snd_pcm_uframes_t frames;
snd_pcm_uframes_t __user *_frames = arg;
snd_pcm_sframes_t result;
if (get_user(frames, _frames))
return -EFAULT;
if (put_user(0, _frames))
return -EFAULT;
result = snd_pcm_capture_forward(substream, frames);
__put_user(result, _frames);
return result < 0 ? result : 0;
}
}
return snd_pcm_common_ioctl1(substream, cmd, arg);
}
static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
snd_pcm_file_t *pcm_file;
pcm_file = file->private_data;
if (((cmd >> 8) & 0xff) != 'A')
return -ENOTTY;
return snd_pcm_playback_ioctl1(pcm_file->substream, cmd, (void __user *)arg);
}
static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
snd_pcm_file_t *pcm_file;
pcm_file = file->private_data;
if (((cmd >> 8) & 0xff) != 'A')
return -ENOTTY;
return snd_pcm_capture_ioctl1(pcm_file->substream, cmd, (void __user *)arg);
}
int snd_pcm_kernel_playback_ioctl(snd_pcm_substream_t *substream,
unsigned int cmd, void *arg)
{
mm_segment_t fs;
int result;
fs = snd_enter_user();
result = snd_pcm_playback_ioctl1(substream, cmd, (void __user *)arg);
snd_leave_user(fs);
return result;
}
int snd_pcm_kernel_capture_ioctl(snd_pcm_substream_t *substream,
unsigned int cmd, void *arg)
{
mm_segment_t fs;
int result;
fs = snd_enter_user();
result = snd_pcm_capture_ioctl1(substream, cmd, (void __user *)arg);
snd_leave_user(fs);
return result;
}
int snd_pcm_kernel_ioctl(snd_pcm_substream_t *substream,
unsigned int cmd, void *arg)
{
switch (substream->stream) {
case SNDRV_PCM_STREAM_PLAYBACK:
return snd_pcm_kernel_playback_ioctl(substream, cmd, arg);
case SNDRV_PCM_STREAM_CAPTURE:
return snd_pcm_kernel_capture_ioctl(substream, cmd, arg);
default:
return -EINVAL;
}
}
static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, loff_t * offset)
{
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
snd_pcm_sframes_t result;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (!frame_aligned(runtime, count))
return -EINVAL;
count = bytes_to_frames(runtime, count);
result = snd_pcm_lib_read(substream, buf, count);
if (result > 0)
result = frames_to_bytes(runtime, result);
return result;
}
static ssize_t snd_pcm_write(struct file *file, const char __user *buf, size_t count, loff_t * offset)
{
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
snd_pcm_sframes_t result;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, result = -ENXIO; goto end);
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
result = -EBADFD;
goto end;
}
if (!frame_aligned(runtime, count)) {
result = -EINVAL;
goto end;
}
count = bytes_to_frames(runtime, count);
result = snd_pcm_lib_write(substream, buf, count);
if (result > 0)
result = frames_to_bytes(runtime, result);
end:
return result;
}
static ssize_t snd_pcm_readv(struct file *file, const struct iovec *_vector,
unsigned long count, loff_t * offset)
{
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
snd_pcm_sframes_t result;
unsigned long i;
void __user **bufs;
snd_pcm_uframes_t frames;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (count > 1024 || count != runtime->channels)
return -EINVAL;
if (!frame_aligned(runtime, _vector->iov_len))
return -EINVAL;
frames = bytes_to_samples(runtime, _vector->iov_len);
bufs = kmalloc(sizeof(void *) * count, GFP_KERNEL);
if (bufs == NULL)
return -ENOMEM;
for (i = 0; i < count; ++i)
bufs[i] = _vector[i].iov_base;
result = snd_pcm_lib_readv(substream, bufs, frames);
if (result > 0)
result = frames_to_bytes(runtime, result);
kfree(bufs);
return result;
}
static ssize_t snd_pcm_writev(struct file *file, const struct iovec *_vector,
unsigned long count, loff_t * offset)
{
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
snd_pcm_sframes_t result;
unsigned long i;
void __user **bufs;
snd_pcm_uframes_t frames;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, result = -ENXIO; goto end);
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
result = -EBADFD;
goto end;
}
if (count > 128 || count != runtime->channels ||
!frame_aligned(runtime, _vector->iov_len)) {
result = -EINVAL;
goto end;
}
frames = bytes_to_samples(runtime, _vector->iov_len);
bufs = kmalloc(sizeof(void *) * count, GFP_KERNEL);
if (bufs == NULL)
return -ENOMEM;
for (i = 0; i < count; ++i)
bufs[i] = _vector[i].iov_base;
result = snd_pcm_lib_writev(substream, bufs, frames);
if (result > 0)
result = frames_to_bytes(runtime, result);
kfree(bufs);
end:
return result;
}
static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
{
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
unsigned int mask;
snd_pcm_uframes_t avail;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
poll_wait(file, &runtime->sleep, wait);
snd_pcm_stream_lock_irq(substream);
avail = snd_pcm_playback_avail(runtime);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_PAUSED:
if (avail >= runtime->control->avail_min) {
mask = POLLOUT | POLLWRNORM;
break;
}
/* Fall through */
case SNDRV_PCM_STATE_DRAINING:
mask = 0;
break;
default:
mask = POLLOUT | POLLWRNORM | POLLERR;
break;
}
snd_pcm_stream_unlock_irq(substream);
return mask;
}
static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
{
snd_pcm_file_t *pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
unsigned int mask;
snd_pcm_uframes_t avail;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
poll_wait(file, &runtime->sleep, wait);
snd_pcm_stream_lock_irq(substream);
avail = snd_pcm_capture_avail(runtime);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_PAUSED:
if (avail >= runtime->control->avail_min) {
mask = POLLIN | POLLRDNORM;
break;
}
mask = 0;
break;
case SNDRV_PCM_STATE_DRAINING:
if (avail > 0) {
mask = POLLIN | POLLRDNORM;
break;
}
/* Fall through */
default:
mask = POLLIN | POLLRDNORM | POLLERR;
break;
}
snd_pcm_stream_unlock_irq(substream);
return mask;
}
/*
* mmap support
*/
/*
* Only on coherent architectures, we can mmap the status and the control records
* for effcient data transfer. On others, we have to use HWSYNC ioctl...
*/
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
/*
* mmap status record
*/
static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area, unsigned long address, int *type)
{
snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
snd_pcm_runtime_t *runtime;
struct page * page;
if (substream == NULL)
return NOPAGE_OOM;
runtime = substream->runtime;
page = virt_to_page(runtime->status);
if (!PageReserved(page))
get_page(page);
if (type)
*type = VM_FAULT_MINOR;
return page;
}
static struct vm_operations_struct snd_pcm_vm_ops_status =
{
.nopage = snd_pcm_mmap_status_nopage,
};
static int snd_pcm_mmap_status(snd_pcm_substream_t *substream, struct file *file,
struct vm_area_struct *area)
{
snd_pcm_runtime_t *runtime;
long size;
if (!(area->vm_flags & VM_READ))
return -EINVAL;
runtime = substream->runtime;
snd_assert(runtime != NULL, return -EAGAIN);
size = area->vm_end - area->vm_start;
if (size != PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)))
return -EINVAL;
area->vm_ops = &snd_pcm_vm_ops_status;
area->vm_private_data = substream;
area->vm_flags |= VM_RESERVED;
return 0;
}
/*
* mmap control record
*/
static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area, unsigned long address, int *type)
{
snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
snd_pcm_runtime_t *runtime;
struct page * page;
if (substream == NULL)
return NOPAGE_OOM;
runtime = substream->runtime;
page = virt_to_page(runtime->control);
if (!PageReserved(page))
get_page(page);
if (type)
*type = VM_FAULT_MINOR;
return page;
}
static struct vm_operations_struct snd_pcm_vm_ops_control =
{
.nopage = snd_pcm_mmap_control_nopage,
};
static int snd_pcm_mmap_control(snd_pcm_substream_t *substream, struct file *file,
struct vm_area_struct *area)
{
snd_pcm_runtime_t *runtime;
long size;
if (!(area->vm_flags & VM_READ))
return -EINVAL;
runtime = substream->runtime;
snd_assert(runtime != NULL, return -EAGAIN);
size = area->vm_end - area->vm_start;
if (size != PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)))
return -EINVAL;
area->vm_ops = &snd_pcm_vm_ops_control;
area->vm_private_data = substream;
area->vm_flags |= VM_RESERVED;
return 0;
}
#else /* ! coherent mmap */
/*
* don't support mmap for status and control records.
*/
static int snd_pcm_mmap_status(snd_pcm_substream_t *substream, struct file *file,
struct vm_area_struct *area)
{
return -ENXIO;
}
static int snd_pcm_mmap_control(snd_pcm_substream_t *substream, struct file *file,
struct vm_area_struct *area)
{
return -ENXIO;
}
#endif /* coherent mmap */
/*
* nopage callback for mmapping a RAM page
*/
static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area, unsigned long address, int *type)
{
snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
snd_pcm_runtime_t *runtime;
unsigned long offset;
struct page * page;
void *vaddr;
size_t dma_bytes;
if (substream == NULL)
return NOPAGE_OOM;
runtime = substream->runtime;
offset = area->vm_pgoff << PAGE_SHIFT;
offset += address - area->vm_start;
snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_OOM);
dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
if (offset > dma_bytes - PAGE_SIZE)
return NOPAGE_SIGBUS;
if (substream->ops->page) {
page = substream->ops->page(substream, offset);
if (! page)
return NOPAGE_OOM;
} else {
vaddr = runtime->dma_area + offset;
page = virt_to_page(vaddr);
}
if (!PageReserved(page))
get_page(page);
if (type)
*type = VM_FAULT_MINOR;
return page;
}
static struct vm_operations_struct snd_pcm_vm_ops_data =
{
.open = snd_pcm_mmap_data_open,
.close = snd_pcm_mmap_data_close,
.nopage = snd_pcm_mmap_data_nopage,
};
/*
* mmap the DMA buffer on RAM
*/
static int snd_pcm_default_mmap(snd_pcm_substream_t *substream, struct vm_area_struct *area)
{
area->vm_ops = &snd_pcm_vm_ops_data;
area->vm_private_data = substream;
area->vm_flags |= VM_RESERVED;
atomic_inc(&substream->runtime->mmap_count);
return 0;
}
/*
* mmap the DMA buffer on I/O memory area
*/
#if SNDRV_PCM_INFO_MMAP_IOMEM
static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
{
.open = snd_pcm_mmap_data_open,
.close = snd_pcm_mmap_data_close,
};
int snd_pcm_lib_mmap_iomem(snd_pcm_substream_t *substream, struct vm_area_struct *area)
{
long size;
unsigned long offset;
#ifdef pgprot_noncached
area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
#endif
area->vm_ops = &snd_pcm_vm_ops_data_mmio;
area->vm_private_data = substream;
area->vm_flags |= VM_IO;
size = area->vm_end - area->vm_start;
offset = area->vm_pgoff << PAGE_SHIFT;
if (io_remap_pfn_range(area, area->vm_start,
(substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
size, area->vm_page_prot))
return -EAGAIN;
atomic_inc(&substream->runtime->mmap_count);
return 0;
}
#endif /* SNDRV_PCM_INFO_MMAP */
/*
* mmap DMA buffer
*/
int snd_pcm_mmap_data(snd_pcm_substream_t *substream, struct file *file,
struct vm_area_struct *area)
{
snd_pcm_runtime_t *runtime;
long size;
unsigned long offset;
size_t dma_bytes;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (!(area->vm_flags & (VM_WRITE|VM_READ)))
return -EINVAL;
} else {
if (!(area->vm_flags & VM_READ))
return -EINVAL;
}
runtime = substream->runtime;
snd_assert(runtime != NULL, return -EAGAIN);
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
return -ENXIO;
if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
return -EINVAL;
size = area->vm_end - area->vm_start;
offset = area->vm_pgoff << PAGE_SHIFT;
dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
if ((size_t)size > dma_bytes)
return -EINVAL;
if (offset > dma_bytes - size)
return -EINVAL;
if (substream->ops->mmap)
return substream->ops->mmap(substream, area);
else
return snd_pcm_default_mmap(substream, area);
}
static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
{
snd_pcm_file_t * pcm_file;
snd_pcm_substream_t *substream;
unsigned long offset;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
offset = area->vm_pgoff << PAGE_SHIFT;
switch (offset) {
case SNDRV_PCM_MMAP_OFFSET_STATUS:
if (substream->no_mmap_ctrl)
return -ENXIO;
return snd_pcm_mmap_status(substream, file, area);
case SNDRV_PCM_MMAP_OFFSET_CONTROL:
if (substream->no_mmap_ctrl)
return -ENXIO;
return snd_pcm_mmap_control(substream, file, area);
default:
return snd_pcm_mmap_data(substream, file, area);
}
return 0;
}
static int snd_pcm_fasync(int fd, struct file * file, int on)
{
snd_pcm_file_t * pcm_file;
snd_pcm_substream_t *substream;
snd_pcm_runtime_t *runtime;
int err;
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
runtime = substream->runtime;
err = fasync_helper(fd, file, on, &runtime->fasync);
if (err < 0)
return err;
return 0;
}
/*
* ioctl32 compat
*/
#ifdef CONFIG_COMPAT
#include "pcm_compat.c"
#else
#define snd_pcm_ioctl_compat NULL
#endif
/*
* To be removed helpers to keep binary compatibility
*/
#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
static void snd_pcm_hw_convert_from_old_params(snd_pcm_hw_params_t *params, struct sndrv_pcm_hw_params_old *oparams)
{
unsigned int i;
memset(params, 0, sizeof(*params));
params->flags = oparams->flags;
for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
params->masks[i].bits[0] = oparams->masks[i];
memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
params->info = oparams->info;
params->msbits = oparams->msbits;
params->rate_num = oparams->rate_num;
params->rate_den = oparams->rate_den;
params->fifo_size = oparams->fifo_size;
}
static void snd_pcm_hw_convert_to_old_params(struct sndrv_pcm_hw_params_old *oparams, snd_pcm_hw_params_t *params)
{
unsigned int i;
memset(oparams, 0, sizeof(*oparams));
oparams->flags = params->flags;
for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
oparams->masks[i] = params->masks[i].bits[0];
memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
oparams->info = params->info;
oparams->msbits = params->msbits;
oparams->rate_num = params->rate_num;
oparams->rate_den = params->rate_den;
oparams->fifo_size = params->fifo_size;
}
static int snd_pcm_hw_refine_old_user(snd_pcm_substream_t * substream, struct sndrv_pcm_hw_params_old __user * _oparams)
{
snd_pcm_hw_params_t *params;
struct sndrv_pcm_hw_params_old *oparams = NULL;
int err;
params = kmalloc(sizeof(*params), GFP_KERNEL);
if (!params) {
err = -ENOMEM;
goto out;
}
oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
if (!oparams) {
err = -ENOMEM;
goto out;
}
if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
err = -EFAULT;
goto out;
}
snd_pcm_hw_convert_from_old_params(params, oparams);
err = snd_pcm_hw_refine(substream, params);
snd_pcm_hw_convert_to_old_params(oparams, params);
if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
if (!err)
err = -EFAULT;
}
out:
kfree(params);
kfree(oparams);
return err;
}
static int snd_pcm_hw_params_old_user(snd_pcm_substream_t * substream, struct sndrv_pcm_hw_params_old __user * _oparams)
{
snd_pcm_hw_params_t *params;
struct sndrv_pcm_hw_params_old *oparams = NULL;
int err;
params = kmalloc(sizeof(*params), GFP_KERNEL);
if (!params) {
err = -ENOMEM;
goto out;
}
oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
if (!oparams) {
err = -ENOMEM;
goto out;
}
if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
err = -EFAULT;
goto out;
}
snd_pcm_hw_convert_from_old_params(params, oparams);
err = snd_pcm_hw_params(substream, params);
snd_pcm_hw_convert_to_old_params(oparams, params);
if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
if (!err)
err = -EFAULT;
}
out:
kfree(params);
kfree(oparams);
return err;
}
/*
* Register section
*/
static struct file_operations snd_pcm_f_ops_playback = {
.owner = THIS_MODULE,
.write = snd_pcm_write,
.writev = snd_pcm_writev,
.open = snd_pcm_open,
.release = snd_pcm_release,
.poll = snd_pcm_playback_poll,
.unlocked_ioctl = snd_pcm_playback_ioctl,
.compat_ioctl = snd_pcm_ioctl_compat,
.mmap = snd_pcm_mmap,
.fasync = snd_pcm_fasync,
};
static struct file_operations snd_pcm_f_ops_capture = {
.owner = THIS_MODULE,
.read = snd_pcm_read,
.readv = snd_pcm_readv,
.open = snd_pcm_open,
.release = snd_pcm_release,
.poll = snd_pcm_capture_poll,
.unlocked_ioctl = snd_pcm_capture_ioctl,
.compat_ioctl = snd_pcm_ioctl_compat,
.mmap = snd_pcm_mmap,
.fasync = snd_pcm_fasync,
};
snd_minor_t snd_pcm_reg[2] =
{
{
.comment = "digital audio playback",
.f_ops = &snd_pcm_f_ops_playback,
},
{
.comment = "digital audio capture",
.f_ops = &snd_pcm_f_ops_capture,
}
};
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