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linux-sg2042/sound/core/pcm.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/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/info.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
MODULE_LICENSE("GPL");
snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
static LIST_HEAD(snd_pcm_notify_list);
static DECLARE_MUTEX(register_mutex);
static int snd_pcm_free(snd_pcm_t *pcm);
static int snd_pcm_dev_free(snd_device_t *device);
static int snd_pcm_dev_register(snd_device_t *device);
static int snd_pcm_dev_disconnect(snd_device_t *device);
static int snd_pcm_dev_unregister(snd_device_t *device);
static int snd_pcm_control_ioctl(snd_card_t * card,
snd_ctl_file_t * control,
unsigned int cmd, unsigned long arg)
{
unsigned int tmp;
tmp = card->number * SNDRV_PCM_DEVICES;
switch (cmd) {
case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
{
int device;
if (get_user(device, (int __user *)arg))
return -EFAULT;
device = device < 0 ? 0 : device + 1;
while (device < SNDRV_PCM_DEVICES) {
if (snd_pcm_devices[tmp + device])
break;
device++;
}
if (device == SNDRV_PCM_DEVICES)
device = -1;
if (put_user(device, (int __user *)arg))
return -EFAULT;
return 0;
}
case SNDRV_CTL_IOCTL_PCM_INFO:
{
snd_pcm_info_t __user *info;
unsigned int device, subdevice;
snd_pcm_stream_t stream;
snd_pcm_t *pcm;
snd_pcm_str_t *pstr;
snd_pcm_substream_t *substream;
info = (snd_pcm_info_t __user *)arg;
if (get_user(device, &info->device))
return -EFAULT;
if (device >= SNDRV_PCM_DEVICES)
return -ENXIO;
pcm = snd_pcm_devices[tmp + device];
if (pcm == NULL)
return -ENXIO;
if (get_user(stream, &info->stream))
return -EFAULT;
if (stream < 0 || stream > 1)
return -EINVAL;
pstr = &pcm->streams[stream];
if (pstr->substream_count == 0)
return -ENOENT;
if (get_user(subdevice, &info->subdevice))
return -EFAULT;
if (subdevice >= pstr->substream_count)
return -ENXIO;
for (substream = pstr->substream; substream; substream = substream->next)
if (substream->number == (int)subdevice)
break;
if (substream == NULL)
return -ENXIO;
return snd_pcm_info_user(substream, info);
}
case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
{
int val;
if (get_user(val, (int __user *)arg))
return -EFAULT;
control->prefer_pcm_subdevice = val;
return 0;
}
}
return -ENOIOCTLCMD;
}
#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
#define READY(v) [SNDRV_PCM_READY_##v] = #v
#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
#define START(v) [SNDRV_PCM_START_##v] = #v
#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
static char *snd_pcm_stream_names[] = {
STREAM(PLAYBACK),
STREAM(CAPTURE),
};
static char *snd_pcm_state_names[] = {
STATE(OPEN),
STATE(SETUP),
STATE(PREPARED),
STATE(RUNNING),
STATE(XRUN),
STATE(DRAINING),
STATE(PAUSED),
STATE(SUSPENDED),
};
static char *snd_pcm_access_names[] = {
ACCESS(MMAP_INTERLEAVED),
ACCESS(MMAP_NONINTERLEAVED),
ACCESS(MMAP_COMPLEX),
ACCESS(RW_INTERLEAVED),
ACCESS(RW_NONINTERLEAVED),
};
static char *snd_pcm_format_names[] = {
FORMAT(S8),
FORMAT(U8),
FORMAT(S16_LE),
FORMAT(S16_BE),
FORMAT(U16_LE),
FORMAT(U16_BE),
FORMAT(S24_LE),
FORMAT(S24_BE),
FORMAT(U24_LE),
FORMAT(U24_BE),
FORMAT(S32_LE),
FORMAT(S32_BE),
FORMAT(U32_LE),
FORMAT(U32_BE),
FORMAT(FLOAT_LE),
FORMAT(FLOAT_BE),
FORMAT(FLOAT64_LE),
FORMAT(FLOAT64_BE),
FORMAT(IEC958_SUBFRAME_LE),
FORMAT(IEC958_SUBFRAME_BE),
FORMAT(MU_LAW),
FORMAT(A_LAW),
FORMAT(IMA_ADPCM),
FORMAT(MPEG),
FORMAT(GSM),
FORMAT(SPECIAL),
FORMAT(S24_3LE),
FORMAT(S24_3BE),
FORMAT(U24_3LE),
FORMAT(U24_3BE),
FORMAT(S20_3LE),
FORMAT(S20_3BE),
FORMAT(U20_3LE),
FORMAT(U20_3BE),
FORMAT(S18_3LE),
FORMAT(S18_3BE),
FORMAT(U18_3LE),
FORMAT(U18_3BE),
};
static char *snd_pcm_subformat_names[] = {
SUBFORMAT(STD),
};
static char *snd_pcm_tstamp_mode_names[] = {
TSTAMP(NONE),
TSTAMP(MMAP),
};
static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
{
snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
return snd_pcm_stream_names[stream];
}
static const char *snd_pcm_access_name(snd_pcm_access_t access)
{
snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
return snd_pcm_access_names[access];
}
const char *snd_pcm_format_name(snd_pcm_format_t format)
{
snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
return snd_pcm_format_names[format];
}
static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
{
snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
return snd_pcm_subformat_names[subformat];
}
static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
{
snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
return snd_pcm_tstamp_mode_names[mode];
}
static const char *snd_pcm_state_name(snd_pcm_state_t state)
{
snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
return snd_pcm_state_names[state];
}
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
#include <linux/soundcard.h>
static const char *snd_pcm_oss_format_name(int format)
{
switch (format) {
case AFMT_MU_LAW:
return "MU_LAW";
case AFMT_A_LAW:
return "A_LAW";
case AFMT_IMA_ADPCM:
return "IMA_ADPCM";
case AFMT_U8:
return "U8";
case AFMT_S16_LE:
return "S16_LE";
case AFMT_S16_BE:
return "S16_BE";
case AFMT_S8:
return "S8";
case AFMT_U16_LE:
return "U16_LE";
case AFMT_U16_BE:
return "U16_BE";
case AFMT_MPEG:
return "MPEG";
default:
return "unknown";
}
}
#endif
#ifdef CONFIG_PROC_FS
static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
{
snd_pcm_info_t *info;
int err;
snd_runtime_check(substream, return);
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (! info) {
printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
return;
}
err = snd_pcm_info(substream, info);
if (err < 0) {
snd_iprintf(buffer, "error %d\n", err);
kfree(info);
return;
}
snd_iprintf(buffer, "card: %d\n", info->card);
snd_iprintf(buffer, "device: %d\n", info->device);
snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
snd_iprintf(buffer, "id: %s\n", info->id);
snd_iprintf(buffer, "name: %s\n", info->name);
snd_iprintf(buffer, "subname: %s\n", info->subname);
snd_iprintf(buffer, "class: %d\n", info->dev_class);
snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
kfree(info);
}
static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
}
static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
}
static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
return;
}
snd_pcm_stream_lock_irq(substream);
if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
snd_iprintf(buffer, "no setup\n");
snd_pcm_stream_unlock_irq(substream);
return;
}
snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
snd_iprintf(buffer, "channels: %u\n", runtime->channels);
snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
if (substream->oss.oss) {
snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
}
#endif
snd_pcm_stream_unlock_irq(substream);
}
static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
return;
}
snd_pcm_stream_lock_irq(substream);
if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
snd_iprintf(buffer, "no setup\n");
snd_pcm_stream_unlock_irq(substream);
return;
}
snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
snd_pcm_stream_unlock_irq(substream);
}
static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_status_t status;
int err;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
return;
}
memset(&status, 0, sizeof(status));
err = snd_pcm_status(substream, &status);
if (err < 0) {
snd_iprintf(buffer, "error %d\n", err);
return;
}
snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
status.tstamp.tv_sec, status.tstamp.tv_nsec);
snd_iprintf(buffer, "delay : %ld\n", status.delay);
snd_iprintf(buffer, "avail : %ld\n", status.avail);
snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
snd_iprintf(buffer, "-----\n");
snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
}
#endif
#ifdef CONFIG_SND_DEBUG
static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
}
static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
char line[64];
if (!snd_info_get_line(buffer, line, sizeof(line)))
pstr->xrun_debug = simple_strtoul(line, NULL, 10);
}
#endif
static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
{
snd_pcm_t *pcm = pstr->pcm;
snd_info_entry_t *entry;
char name[16];
sprintf(name, "pcm%i%c", pcm->device,
pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
return -ENOMEM;
entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
return -ENOMEM;
}
pstr->proc_root = entry;
if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
pstr->proc_info_entry = entry;
#ifdef CONFIG_SND_DEBUG
if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
entry->c.text.read_size = 64;
entry->c.text.read = snd_pcm_xrun_debug_read;
entry->c.text.write_size = 64;
entry->c.text.write = snd_pcm_xrun_debug_write;
entry->mode |= S_IWUSR;
entry->private_data = pstr;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
pstr->proc_xrun_debug_entry = entry;
#endif
return 0;
}
static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
{
#ifdef CONFIG_SND_DEBUG
if (pstr->proc_xrun_debug_entry) {
snd_info_unregister(pstr->proc_xrun_debug_entry);
pstr->proc_xrun_debug_entry = NULL;
}
#endif
if (pstr->proc_info_entry) {
snd_info_unregister(pstr->proc_info_entry);
pstr->proc_info_entry = NULL;
}
if (pstr->proc_root) {
snd_info_unregister(pstr->proc_root);
pstr->proc_root = NULL;
}
return 0;
}
static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
{
snd_info_entry_t *entry;
snd_card_t *card;
char name[16];
card = substream->pcm->card;
sprintf(name, "sub%i", substream->number);
if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
return -ENOMEM;
entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
return -ENOMEM;
}
substream->proc_root = entry;
if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
substream->proc_info_entry = entry;
if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
substream->proc_hw_params_entry = entry;
if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
substream->proc_sw_params_entry = entry;
if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
substream->proc_status_entry = entry;
return 0;
}
static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
{
if (substream->proc_info_entry) {
snd_info_unregister(substream->proc_info_entry);
substream->proc_info_entry = NULL;
}
if (substream->proc_hw_params_entry) {
snd_info_unregister(substream->proc_hw_params_entry);
substream->proc_hw_params_entry = NULL;
}
if (substream->proc_sw_params_entry) {
snd_info_unregister(substream->proc_sw_params_entry);
substream->proc_sw_params_entry = NULL;
}
if (substream->proc_status_entry) {
snd_info_unregister(substream->proc_status_entry);
substream->proc_status_entry = NULL;
}
if (substream->proc_root) {
snd_info_unregister(substream->proc_root);
substream->proc_root = NULL;
}
return 0;
}
/**
* snd_pcm_new_stream - create a new PCM stream
* @pcm: the pcm instance
* @stream: the stream direction, SNDRV_PCM_STREAM_XXX
* @substream_count: the number of substreams
*
* Creates a new stream for the pcm.
* The corresponding stream on the pcm must have been empty before
* calling this, i.e. zero must be given to the argument of
* snd_pcm_new().
*
* Returns zero if successful, or a negative error code on failure.
*/
int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
{
int idx, err;
snd_pcm_str_t *pstr = &pcm->streams[stream];
snd_pcm_substream_t *substream, *prev;
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
init_MUTEX(&pstr->oss.setup_mutex);
#endif
pstr->stream = stream;
pstr->pcm = pcm;
pstr->substream_count = substream_count;
pstr->reg = &snd_pcm_reg[stream];
if (substream_count > 0) {
err = snd_pcm_stream_proc_init(pstr);
if (err < 0)
return err;
}
prev = NULL;
for (idx = 0, prev = NULL; idx < substream_count; idx++) {
substream = kcalloc(1, sizeof(*substream), GFP_KERNEL);
if (substream == NULL)
return -ENOMEM;
substream->pcm = pcm;
substream->pstr = pstr;
substream->number = idx;
substream->stream = stream;
sprintf(substream->name, "subdevice #%i", idx);
substream->buffer_bytes_max = UINT_MAX;
if (prev == NULL)
pstr->substream = substream;
else
prev->next = substream;
err = snd_pcm_substream_proc_init(substream);
if (err < 0) {
kfree(substream);
return err;
}
substream->group = &substream->self_group;
spin_lock_init(&substream->self_group.lock);
INIT_LIST_HEAD(&substream->self_group.substreams);
list_add_tail(&substream->link_list, &substream->self_group.substreams);
spin_lock_init(&substream->timer_lock);
prev = substream;
}
return 0;
}
/**
* snd_pcm_new - create a new PCM instance
* @card: the card instance
* @id: the id string
* @device: the device index (zero based)
* @playback_count: the number of substreams for playback
* @capture_count: the number of substreams for capture
* @rpcm: the pointer to store the new pcm instance
*
* Creates a new PCM instance.
*
* The pcm operators have to be set afterwards to the new instance
* via snd_pcm_set_ops().
*
* Returns zero if successful, or a negative error code on failure.
*/
int snd_pcm_new(snd_card_t * card, char *id, int device,
int playback_count, int capture_count,
snd_pcm_t ** rpcm)
{
snd_pcm_t *pcm;
int err;
static snd_device_ops_t ops = {
.dev_free = snd_pcm_dev_free,
.dev_register = snd_pcm_dev_register,
.dev_disconnect = snd_pcm_dev_disconnect,
.dev_unregister = snd_pcm_dev_unregister
};
snd_assert(rpcm != NULL, return -EINVAL);
*rpcm = NULL;
snd_assert(card != NULL, return -ENXIO);
pcm = kcalloc(1, sizeof(*pcm), GFP_KERNEL);
if (pcm == NULL)
return -ENOMEM;
pcm->card = card;
pcm->device = device;
if (id) {
strlcpy(pcm->id, id, sizeof(pcm->id));
}
if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
snd_pcm_free(pcm);
return err;
}
if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
snd_pcm_free(pcm);
return err;
}
init_MUTEX(&pcm->open_mutex);
init_waitqueue_head(&pcm->open_wait);
if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
snd_pcm_free(pcm);
return err;
}
*rpcm = pcm;
return 0;
}
static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
{
snd_pcm_substream_t *substream, *substream_next;
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
snd_pcm_oss_setup_t *setup, *setupn;
#endif
substream = pstr->substream;
while (substream) {
substream_next = substream->next;
snd_pcm_substream_proc_done(substream);
kfree(substream);
substream = substream_next;
}
snd_pcm_stream_proc_done(pstr);
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
for (setup = pstr->oss.setup_list; setup; setup = setupn) {
setupn = setup->next;
kfree(setup->task_name);
kfree(setup);
}
#endif
}
static int snd_pcm_free(snd_pcm_t *pcm)
{
snd_assert(pcm != NULL, return -ENXIO);
if (pcm->private_free)
pcm->private_free(pcm);
snd_pcm_lib_preallocate_free_for_all(pcm);
snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
kfree(pcm);
return 0;
}
static int snd_pcm_dev_free(snd_device_t *device)
{
snd_pcm_t *pcm = device->device_data;
return snd_pcm_free(pcm);
}
static void snd_pcm_tick_timer_func(unsigned long data)
{
snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
snd_pcm_tick_elapsed(substream);
}
int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
snd_pcm_substream_t **rsubstream)
{
snd_pcm_str_t * pstr;
snd_pcm_substream_t * substream;
snd_pcm_runtime_t * runtime;
snd_ctl_file_t *kctl;
snd_card_t *card;
struct list_head *list;
int prefer_subdevice = -1;
size_t size;
snd_assert(rsubstream != NULL, return -EINVAL);
*rsubstream = NULL;
snd_assert(pcm != NULL, return -ENXIO);
pstr = &pcm->streams[stream];
if (pstr->substream == NULL)
return -ENODEV;
card = pcm->card;
down_read(&card->controls_rwsem);
list_for_each(list, &card->ctl_files) {
kctl = snd_ctl_file(list);
if (kctl->pid == current->pid) {
prefer_subdevice = kctl->prefer_pcm_subdevice;
break;
}
}
up_read(&card->controls_rwsem);
if (pstr->substream_count == 0)
return -ENODEV;
switch (stream) {
case SNDRV_PCM_STREAM_PLAYBACK:
if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
if (SUBSTREAM_BUSY(substream))
return -EAGAIN;
}
}
break;
case SNDRV_PCM_STREAM_CAPTURE:
if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
if (SUBSTREAM_BUSY(substream))
return -EAGAIN;
}
}
break;
default:
return -EINVAL;
}
if (prefer_subdevice >= 0) {
for (substream = pstr->substream; substream; substream = substream->next)
if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
goto __ok;
}
for (substream = pstr->substream; substream; substream = substream->next)
if (!SUBSTREAM_BUSY(substream))
break;
__ok:
if (substream == NULL)
return -EAGAIN;
runtime = kcalloc(1, sizeof(*runtime), GFP_KERNEL);
if (runtime == NULL)
return -ENOMEM;
size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
runtime->status = snd_malloc_pages(size, GFP_KERNEL);
if (runtime->status == NULL) {
kfree(runtime);
return -ENOMEM;
}
memset((void*)runtime->status, 0, size);
size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
runtime->control = snd_malloc_pages(size, GFP_KERNEL);
if (runtime->control == NULL) {
snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
kfree(runtime);
return -ENOMEM;
}
memset((void*)runtime->control, 0, size);
init_waitqueue_head(&runtime->sleep);
atomic_set(&runtime->mmap_count, 0);
init_timer(&runtime->tick_timer);
runtime->tick_timer.function = snd_pcm_tick_timer_func;
runtime->tick_timer.data = (unsigned long) substream;
runtime->status->state = SNDRV_PCM_STATE_OPEN;
substream->runtime = runtime;
substream->private_data = pcm->private_data;
pstr->substream_opened++;
*rsubstream = substream;
return 0;
}
void snd_pcm_release_substream(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t * runtime;
substream->file = NULL;
runtime = substream->runtime;
snd_assert(runtime != NULL, return);
if (runtime->private_free != NULL)
runtime->private_free(runtime);
snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
kfree(runtime->hw_constraints.rules);
kfree(runtime);
substream->runtime = NULL;
substream->pstr->substream_opened--;
}
static int snd_pcm_dev_register(snd_device_t *device)
{
int idx, cidx, err;
unsigned short minor;
snd_pcm_substream_t *substream;
struct list_head *list;
char str[16];
snd_pcm_t *pcm = device->device_data;
snd_assert(pcm != NULL && device != NULL, return -ENXIO);
down(&register_mutex);
idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
if (snd_pcm_devices[idx]) {
up(&register_mutex);
return -EBUSY;
}
snd_pcm_devices[idx] = pcm;
for (cidx = 0; cidx < 2; cidx++) {
int devtype = -1;
if (pcm->streams[cidx].substream == NULL)
continue;
switch (cidx) {
case SNDRV_PCM_STREAM_PLAYBACK:
sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
break;
case SNDRV_PCM_STREAM_CAPTURE:
sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
minor = SNDRV_MINOR_PCM_CAPTURE + idx;
devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
break;
}
if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
snd_pcm_devices[idx] = NULL;
up(&register_mutex);
return err;
}
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
snd_pcm_timer_init(substream);
}
list_for_each(list, &snd_pcm_notify_list) {
snd_pcm_notify_t *notify;
notify = list_entry(list, snd_pcm_notify_t, list);
notify->n_register(pcm);
}
up(&register_mutex);
return 0;
}
static int snd_pcm_dev_disconnect(snd_device_t *device)
{
snd_pcm_t *pcm = device->device_data;
struct list_head *list;
snd_pcm_substream_t *substream;
int idx, cidx;
down(&register_mutex);
idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
snd_pcm_devices[idx] = NULL;
for (cidx = 0; cidx < 2; cidx++)
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
if (substream->runtime)
substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
list_for_each(list, &snd_pcm_notify_list) {
snd_pcm_notify_t *notify;
notify = list_entry(list, snd_pcm_notify_t, list);
notify->n_disconnect(pcm);
}
up(&register_mutex);
return 0;
}
static int snd_pcm_dev_unregister(snd_device_t *device)
{
int idx, cidx, devtype;
snd_pcm_substream_t *substream;
struct list_head *list;
snd_pcm_t *pcm = device->device_data;
snd_assert(pcm != NULL, return -ENXIO);
down(&register_mutex);
idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
snd_pcm_devices[idx] = NULL;
for (cidx = 0; cidx < 2; cidx++) {
devtype = -1;
switch (cidx) {
case SNDRV_PCM_STREAM_PLAYBACK:
devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
break;
case SNDRV_PCM_STREAM_CAPTURE:
devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
break;
}
snd_unregister_device(devtype, pcm->card, pcm->device);
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
snd_pcm_timer_done(substream);
}
list_for_each(list, &snd_pcm_notify_list) {
snd_pcm_notify_t *notify;
notify = list_entry(list, snd_pcm_notify_t, list);
notify->n_unregister(pcm);
}
up(&register_mutex);
return snd_pcm_free(pcm);
}
int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
{
int idx;
snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
down(&register_mutex);
if (nfree) {
list_del(&notify->list);
for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
if (snd_pcm_devices[idx] == NULL)
continue;
notify->n_unregister(snd_pcm_devices[idx]);
}
} else {
list_add_tail(&notify->list, &snd_pcm_notify_list);
for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
if (snd_pcm_devices[idx] == NULL)
continue;
notify->n_register(snd_pcm_devices[idx]);
}
}
up(&register_mutex);
return 0;
}
/*
* Info interface
*/
static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
{
int idx;
snd_pcm_t *pcm;
down(&register_mutex);
for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
pcm = snd_pcm_devices[idx];
if (pcm == NULL)
continue;
snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
snd_iprintf(buffer, "\n");
}
up(&register_mutex);
}
/*
* ENTRY functions
*/
static snd_info_entry_t *snd_pcm_proc_entry = NULL;
static int __init alsa_pcm_init(void)
{
snd_info_entry_t *entry;
snd_ctl_register_ioctl(snd_pcm_control_ioctl);
snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
snd_pcm_proc_entry = entry;
return 0;
}
static void __exit alsa_pcm_exit(void)
{
snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
if (snd_pcm_proc_entry) {
snd_info_unregister(snd_pcm_proc_entry);
snd_pcm_proc_entry = NULL;
}
}
module_init(alsa_pcm_init)
module_exit(alsa_pcm_exit)
EXPORT_SYMBOL(snd_pcm_devices);
EXPORT_SYMBOL(snd_pcm_new);
EXPORT_SYMBOL(snd_pcm_new_stream);
EXPORT_SYMBOL(snd_pcm_notify);
EXPORT_SYMBOL(snd_pcm_open_substream);
EXPORT_SYMBOL(snd_pcm_release_substream);
EXPORT_SYMBOL(snd_pcm_format_name);
/* pcm_native.c */
EXPORT_SYMBOL(snd_pcm_link_rwlock);
#ifdef CONFIG_PM
EXPORT_SYMBOL(snd_pcm_suspend);
EXPORT_SYMBOL(snd_pcm_suspend_all);
#endif
EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
EXPORT_SYMBOL(snd_pcm_mmap_data);
#if SNDRV_PCM_INFO_MMAP_IOMEM
EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
#endif
/* pcm_misc.c */
EXPORT_SYMBOL(snd_pcm_format_signed);
EXPORT_SYMBOL(snd_pcm_format_unsigned);
EXPORT_SYMBOL(snd_pcm_format_linear);
EXPORT_SYMBOL(snd_pcm_format_little_endian);
EXPORT_SYMBOL(snd_pcm_format_big_endian);
EXPORT_SYMBOL(snd_pcm_format_width);
EXPORT_SYMBOL(snd_pcm_format_physical_width);
EXPORT_SYMBOL(snd_pcm_format_size);
EXPORT_SYMBOL(snd_pcm_format_silence_64);
EXPORT_SYMBOL(snd_pcm_format_set_silence);
EXPORT_SYMBOL(snd_pcm_build_linear_format);
EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
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