/* * Digital Audio (PCM) abstract layer * Copyright (c) by Jaroslav Kysela * * * 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 #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Jaroslav Kysela , Abramo Bagnara "); MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); MODULE_LICENSE("GPL"); static LIST_HEAD(snd_pcm_devices); static LIST_HEAD(snd_pcm_notify_list); static DEFINE_MUTEX(register_mutex); static int snd_pcm_free(struct snd_pcm *pcm); static int snd_pcm_dev_free(struct snd_device *device); static int snd_pcm_dev_register(struct snd_device *device); static int snd_pcm_dev_disconnect(struct snd_device *device); static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device) { struct snd_pcm *pcm; list_for_each_entry(pcm, &snd_pcm_devices, list) { if (pcm->card == card && pcm->device == device) return pcm; } return NULL; } static int snd_pcm_control_ioctl(struct snd_card *card, struct snd_ctl_file *control, unsigned int cmd, unsigned long arg) { switch (cmd) { case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: { int device; if (get_user(device, (int __user *)arg)) return -EFAULT; mutex_lock(®ister_mutex); device = device < 0 ? 0 : device + 1; while (device < SNDRV_PCM_DEVICES) { if (snd_pcm_search(card, device)) break; device++; } if (device == SNDRV_PCM_DEVICES) device = -1; mutex_unlock(®ister_mutex); if (put_user(device, (int __user *)arg)) return -EFAULT; return 0; } case SNDRV_CTL_IOCTL_PCM_INFO: { struct snd_pcm_info __user *info; unsigned int device, subdevice; int stream; struct snd_pcm *pcm; struct snd_pcm_str *pstr; struct snd_pcm_substream *substream; int err; info = (struct snd_pcm_info __user *)arg; if (get_user(device, &info->device)) return -EFAULT; if (get_user(stream, &info->stream)) return -EFAULT; if (stream < 0 || stream > 1) return -EINVAL; if (get_user(subdevice, &info->subdevice)) return -EFAULT; mutex_lock(®ister_mutex); pcm = snd_pcm_search(card, device); if (pcm == NULL) { err = -ENXIO; goto _error; } pstr = &pcm->streams[stream]; if (pstr->substream_count == 0) { err = -ENOENT; goto _error; } if (subdevice >= pstr->substream_count) { err = -ENXIO; goto _error; } for (substream = pstr->substream; substream; substream = substream->next) if (substream->number == (int)subdevice) break; if (substream == NULL) { err = -ENXIO; goto _error; } err = snd_pcm_info_user(substream, info); _error: mutex_unlock(®ister_mutex); return err; } 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; } #ifdef CONFIG_SND_VERBOSE_PROCFS #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_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 const char *snd_pcm_format_name(snd_pcm_format_t format) { return snd_pcm_format_names[format]; } 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_subformat_names[] = { SUBFORMAT(STD), }; static char *snd_pcm_tstamp_mode_names[] = { TSTAMP(NONE), TSTAMP(MMAP), }; static const char *snd_pcm_stream_name(int 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) { return snd_pcm_access_names[access]; } static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) { return snd_pcm_subformat_names[subformat]; } static const char *snd_pcm_tstamp_mode_name(int 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) { return snd_pcm_state_names[state]; } #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) #include 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 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, struct snd_info_buffer *buffer) { struct snd_pcm_info *info; int err; if (! 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(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, buffer); } static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data, buffer); } static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_pcm_substream *substream = entry->private_data; struct snd_pcm_runtime *runtime = substream->runtime; if (!runtime) { snd_iprintf(buffer, "closed\n"); return; } if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { snd_iprintf(buffer, "no setup\n"); 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 } static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_pcm_substream *substream = entry->private_data; struct snd_pcm_runtime *runtime = substream->runtime; if (!runtime) { snd_iprintf(buffer, "closed\n"); return; } if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { snd_iprintf(buffer, "no setup\n"); 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); } static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_pcm_substream *substream = entry->private_data; struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_status 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); } #ifdef CONFIG_SND_PCM_XRUN_DEBUG static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_pcm_str *pstr = entry->private_data; snd_iprintf(buffer, "%d\n", pstr->xrun_debug); } static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_pcm_str *pstr = 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(struct snd_pcm_str *pstr) { struct snd_pcm *pcm = pstr->pcm; struct snd_info_entry *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, 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_PCM_XRUN_DEBUG if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) { entry->c.text.read = snd_pcm_xrun_debug_read; 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(struct snd_pcm_str *pstr) { #ifdef CONFIG_SND_PCM_XRUN_DEBUG snd_info_free_entry(pstr->proc_xrun_debug_entry); pstr->proc_xrun_debug_entry = NULL; #endif snd_info_free_entry(pstr->proc_info_entry); pstr->proc_info_entry = NULL; snd_info_free_entry(pstr->proc_root); pstr->proc_root = NULL; return 0; } static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { struct snd_info_entry *entry; struct snd_card *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, 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, 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, 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, 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(struct snd_pcm_substream *substream) { snd_info_free_entry(substream->proc_info_entry); substream->proc_info_entry = NULL; snd_info_free_entry(substream->proc_hw_params_entry); substream->proc_hw_params_entry = NULL; snd_info_free_entry(substream->proc_sw_params_entry); substream->proc_sw_params_entry = NULL; snd_info_free_entry(substream->proc_status_entry); substream->proc_status_entry = NULL; snd_info_free_entry(substream->proc_root); substream->proc_root = NULL; return 0; } #else /* !CONFIG_SND_VERBOSE_PROCFS */ static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } #endif /* CONFIG_SND_VERBOSE_PROCFS */ /** * 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(struct snd_pcm *pcm, int stream, int substream_count) { int idx, err; struct snd_pcm_str *pstr = &pcm->streams[stream]; struct snd_pcm_substream *substream, *prev; #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) mutex_init(&pstr->oss.setup_mutex); #endif pstr->stream = stream; pstr->pcm = pcm; pstr->substream_count = substream_count; if (substream_count > 0) { err = snd_pcm_stream_proc_init(pstr); if (err < 0) { snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); return err; } } prev = NULL; for (idx = 0, prev = NULL; idx < substream_count; idx++) { substream = kzalloc(sizeof(*substream), GFP_KERNEL); if (substream == NULL) { snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); return -ENOMEM; } substream->pcm = pcm; substream->pstr = pstr; substream->number = idx; substream->stream = stream; sprintf(substream->name, "subdevice #%i", idx); snprintf(substream->latency_id, sizeof(substream->latency_id), "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device, (stream ? 'c' : 'p'), 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) { snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); if (prev == NULL) pstr->substream = NULL; else prev->next = NULL; 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); atomic_set(&substream->mmap_count, 0); prev = substream; } return 0; } EXPORT_SYMBOL(snd_pcm_new_stream); /** * 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(struct snd_card *card, char *id, int device, int playback_count, int capture_count, struct snd_pcm ** rpcm) { struct snd_pcm *pcm; int err; static struct snd_device_ops ops = { .dev_free = snd_pcm_dev_free, .dev_register = snd_pcm_dev_register, .dev_disconnect = snd_pcm_dev_disconnect, }; snd_assert(rpcm != NULL, return -EINVAL); *rpcm = NULL; snd_assert(card != NULL, return -ENXIO); pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); if (pcm == NULL) { snd_printk(KERN_ERR "Cannot allocate PCM\n"); 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; } mutex_init(&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; } EXPORT_SYMBOL(snd_pcm_new); static void snd_pcm_free_stream(struct snd_pcm_str * pstr) { struct snd_pcm_substream *substream, *substream_next; #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) struct snd_pcm_oss_setup *setup, *setupn; #endif substream = pstr->substream; while (substream) { substream_next = substream->next; snd_pcm_timer_done(substream); 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(struct snd_pcm *pcm) { struct snd_pcm_notify *notify; snd_assert(pcm != NULL, return -ENXIO); list_for_each_entry(notify, &snd_pcm_notify_list, list) { notify->n_unregister(pcm); } 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(struct snd_device *device) { struct snd_pcm *pcm = device->device_data; return snd_pcm_free(pcm); } static void snd_pcm_tick_timer_func(unsigned long data) { struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data; snd_pcm_tick_elapsed(substream); } int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, struct snd_pcm_substream **rsubstream) { struct snd_pcm_str * pstr; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; struct snd_ctl_file *kctl; struct snd_card *card; 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 || pstr->substream_count == 0) return -ENODEV; card = pcm->card; down_read(&card->controls_rwsem); list_for_each_entry(kctl, &card->ctl_files, list) { if (kctl->pid == current->pid) { prefer_subdevice = kctl->prefer_pcm_subdevice; if (prefer_subdevice != -1) break; } } up_read(&card->controls_rwsem); 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 (file->f_flags & O_APPEND) { if (prefer_subdevice < 0) { if (pstr->substream_count > 1) return -EINVAL; /* must be unique */ substream = pstr->substream; } else { for (substream = pstr->substream; substream; substream = substream->next) if (substream->number == prefer_subdevice) break; } if (! substream) return -ENODEV; if (! SUBSTREAM_BUSY(substream)) return -EBADFD; substream->ref_count++; *rsubstream = substream; return 0; } 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 = kzalloc(sizeof(*runtime), GFP_KERNEL); if (runtime == NULL) return -ENOMEM; size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 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(struct snd_pcm_mmap_control)); runtime->control = snd_malloc_pages(size, GFP_KERNEL); if (runtime->control == NULL) { snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); kfree(runtime); return -ENOMEM; } memset((void*)runtime->control, 0, size); init_waitqueue_head(&runtime->sleep); 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; substream->ref_count = 1; substream->f_flags = file->f_flags; pstr->substream_opened++; *rsubstream = substream; return 0; } void snd_pcm_detach_substream(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime; 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(struct snd_pcm_mmap_status))); snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); kfree(runtime->hw_constraints.rules); kfree(runtime); substream->runtime = NULL; substream->pstr->substream_opened--; } static ssize_t show_pcm_class(struct device *dev, struct device_attribute *attr, char *buf) { struct snd_pcm *pcm; const char *str; static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { [SNDRV_PCM_CLASS_GENERIC] = "generic", [SNDRV_PCM_CLASS_MULTI] = "multi", [SNDRV_PCM_CLASS_MODEM] = "modem", [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", }; if (! (pcm = dev_get_drvdata(dev)) || pcm->dev_class > SNDRV_PCM_CLASS_LAST) str = "none"; else str = strs[pcm->dev_class]; return snprintf(buf, PAGE_SIZE, "%s\n", str); } static struct device_attribute pcm_attrs = __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); static int snd_pcm_dev_register(struct snd_device *device) { int cidx, err; struct snd_pcm_substream *substream; struct snd_pcm_notify *notify; char str[16]; struct snd_pcm *pcm = device->device_data; struct device *dev; snd_assert(pcm != NULL && device != NULL, return -ENXIO); mutex_lock(®ister_mutex); if (snd_pcm_search(pcm->card, pcm->device)) { mutex_unlock(®ister_mutex); return -EBUSY; } list_add_tail(&pcm->list, &snd_pcm_devices); 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); devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; break; case SNDRV_PCM_STREAM_CAPTURE: sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; break; } /* device pointer to use, pcm->dev takes precedence if * it is assigned, otherwise fall back to card's device * if possible */ dev = pcm->dev; if (!dev) dev = snd_card_get_device_link(pcm->card); /* register pcm */ err = snd_register_device_for_dev(devtype, pcm->card, pcm->device, &snd_pcm_f_ops[cidx], pcm, str, dev); if (err < 0) { list_del(&pcm->list); mutex_unlock(®ister_mutex); return err; } snd_add_device_sysfs_file(devtype, pcm->card, pcm->device, &pcm_attrs); for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) snd_pcm_timer_init(substream); } list_for_each_entry(notify, &snd_pcm_notify_list, list) notify->n_register(pcm); mutex_unlock(®ister_mutex); return 0; } static int snd_pcm_dev_disconnect(struct snd_device *device) { struct snd_pcm *pcm = device->device_data; struct snd_pcm_notify *notify; struct snd_pcm_substream *substream; int cidx, devtype; mutex_lock(®ister_mutex); if (list_empty(&pcm->list)) goto unlock; list_del_init(&pcm->list); 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_entry(notify, &snd_pcm_notify_list, list) { notify->n_disconnect(pcm); } 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); } unlock: mutex_unlock(®ister_mutex); return 0; } int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) { struct snd_pcm *pcm; snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL && notify->n_disconnect, return -EINVAL); mutex_lock(®ister_mutex); if (nfree) { list_del(¬ify->list); list_for_each_entry(pcm, &snd_pcm_devices, list) notify->n_unregister(pcm); } else { list_add_tail(¬ify->list, &snd_pcm_notify_list); list_for_each_entry(pcm, &snd_pcm_devices, list) notify->n_register(pcm); } mutex_unlock(®ister_mutex); return 0; } EXPORT_SYMBOL(snd_pcm_notify); #ifdef CONFIG_PROC_FS /* * Info interface */ static void snd_pcm_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_pcm *pcm; mutex_lock(®ister_mutex); list_for_each_entry(pcm, &snd_pcm_devices, list) { snd_iprintf(buffer, "%02i-%02i: %s : %s", pcm->card->number, pcm->device, 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"); } mutex_unlock(®ister_mutex); } static struct snd_info_entry *snd_pcm_proc_entry; static void snd_pcm_proc_init(void) { struct snd_info_entry *entry; if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); if (snd_info_register(entry) < 0) { snd_info_free_entry(entry); entry = NULL; } } snd_pcm_proc_entry = entry; } static void snd_pcm_proc_done(void) { snd_info_free_entry(snd_pcm_proc_entry); } #else /* !CONFIG_PROC_FS */ #define snd_pcm_proc_init() #define snd_pcm_proc_done() #endif /* CONFIG_PROC_FS */ /* * ENTRY functions */ static int __init alsa_pcm_init(void) { snd_ctl_register_ioctl(snd_pcm_control_ioctl); snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); snd_pcm_proc_init(); 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); snd_pcm_proc_done(); } module_init(alsa_pcm_init) module_exit(alsa_pcm_exit)