diff options
Diffstat (limited to 'sound/core/pcm.c')
| -rw-r--r-- | sound/core/pcm.c | 1074 |
1 files changed, 1074 insertions, 0 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c new file mode 100644 index 00000000000..8d94325529a --- /dev/null +++ b/sound/core/pcm.c @@ -0,0 +1,1074 @@ +/* + * 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->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(®ister_mutex); + idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; + if (snd_pcm_devices[idx]) { + up(®ister_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(®ister_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(®ister_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(®ister_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(®ister_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(®ister_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(®ister_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(®ister_mutex); + if (nfree) { + list_del(¬ify->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(¬ify->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(®ister_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(®ister_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(®ister_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); +EXPORT_SYMBOL(snd_pcm_start); +#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_silence_64); +EXPORT_SYMBOL(snd_pcm_format_set_silence); +EXPORT_SYMBOL(snd_pcm_build_linear_format); +EXPORT_SYMBOL(snd_pcm_limit_hw_rates); |