| /* |
| * Digital Audio (PCM) abstract layer |
| * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/time.h> |
| #include <linux/mutex.h> |
| #include <linux/device.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@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); |
| 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_get(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_next(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->device; |
| else if (pcm->card->number > card->number) |
| return -1; |
| } |
| return -1; |
| } |
| |
| static int snd_pcm_add(struct snd_pcm *newpcm) |
| { |
| struct snd_pcm *pcm; |
| |
| if (newpcm->internal) |
| return 0; |
| |
| list_for_each_entry(pcm, &snd_pcm_devices, list) { |
| if (pcm->card == newpcm->card && pcm->device == newpcm->device) |
| return -EBUSY; |
| if (pcm->card->number > newpcm->card->number || |
| (pcm->card == newpcm->card && |
| pcm->device > newpcm->device)) { |
| list_add(&newpcm->list, pcm->list.prev); |
| return 0; |
| } |
| } |
| list_add_tail(&newpcm->list, &snd_pcm_devices); |
| return 0; |
| } |
| |
| 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 = snd_pcm_next(card, device); |
| 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_get(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->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val; |
| return 0; |
| } |
| } |
| return -ENOIOCTLCMD; |
| } |
| |
| #define FORMAT(v) [SNDRV_PCM_FORMAT_##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), |
| FORMAT(G723_24), |
| FORMAT(G723_24_1B), |
| FORMAT(G723_40), |
| FORMAT(G723_40_1B), |
| FORMAT(DSD_U8), |
| FORMAT(DSD_U16_LE), |
| FORMAT(DSD_U32_LE), |
| FORMAT(DSD_U16_BE), |
| FORMAT(DSD_U32_BE), |
| }; |
| |
| /** |
| * snd_pcm_format_name - Return a name string for the given PCM format |
| * @format: PCM format |
| */ |
| const char *snd_pcm_format_name(snd_pcm_format_t format) |
| { |
| if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) |
| return "Unknown"; |
| return snd_pcm_format_names[(__force unsigned int)format]; |
| } |
| EXPORT_SYMBOL_GPL(snd_pcm_format_name); |
| |
| #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 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_subformat_names[] = { |
| SUBFORMAT(STD), |
| }; |
| |
| static char *snd_pcm_tstamp_mode_names[] = { |
| TSTAMP(NONE), |
| TSTAMP(ENABLE), |
| }; |
| |
| static const char *snd_pcm_stream_name(int stream) |
| { |
| return snd_pcm_stream_names[stream]; |
| } |
| |
| static const char *snd_pcm_access_name(snd_pcm_access_t access) |
| { |
| return snd_pcm_access_names[(__force int)access]; |
| } |
| |
| static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) |
| { |
| return snd_pcm_subformat_names[(__force int)subformat]; |
| } |
| |
| static const char *snd_pcm_tstamp_mode_name(int mode) |
| { |
| return snd_pcm_tstamp_mode_names[mode]; |
| } |
| |
| static const char *snd_pcm_state_name(snd_pcm_state_t state) |
| { |
| return snd_pcm_state_names[(__force int)state]; |
| } |
| |
| #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| #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 |
| |
| 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) |
| 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(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; |
| |
| mutex_lock(&substream->pcm->open_mutex); |
| runtime = substream->runtime; |
| if (!runtime) { |
| snd_iprintf(buffer, "closed\n"); |
| goto unlock; |
| } |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
| snd_iprintf(buffer, "no setup\n"); |
| goto unlock; |
| } |
| 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); |
| #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| 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 |
| unlock: |
| mutex_unlock(&substream->pcm->open_mutex); |
| } |
| |
| 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; |
| |
| mutex_lock(&substream->pcm->open_mutex); |
| runtime = substream->runtime; |
| if (!runtime) { |
| snd_iprintf(buffer, "closed\n"); |
| goto unlock; |
| } |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
| snd_iprintf(buffer, "no setup\n"); |
| goto unlock; |
| } |
| 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, "avail_min: %lu\n", runtime->control->avail_min); |
| 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); |
| unlock: |
| mutex_unlock(&substream->pcm->open_mutex); |
| } |
| |
| 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; |
| struct snd_pcm_status status; |
| int err; |
| |
| mutex_lock(&substream->pcm->open_mutex); |
| runtime = substream->runtime; |
| if (!runtime) { |
| snd_iprintf(buffer, "closed\n"); |
| goto unlock; |
| } |
| memset(&status, 0, sizeof(status)); |
| err = snd_pcm_status(substream, &status); |
| if (err < 0) { |
| snd_iprintf(buffer, "error %d\n", err); |
| goto unlock; |
| } |
| snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); |
| snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); |
| 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); |
| unlock: |
| mutex_unlock(&substream->pcm->open_mutex); |
| } |
| |
| #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| struct snd_pcm_substream *substream = entry->private_data; |
| struct snd_pcm_runtime *runtime; |
| |
| snd_pcm_stream_lock_irq(substream); |
| runtime = substream->runtime; |
| if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| snd_pcm_stream_unlock_irq(substream); |
| } |
| |
| 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; |
| |
| #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| entry = snd_info_create_card_entry(card, "xrun_injection", |
| substream->proc_root); |
| if (entry) { |
| entry->private_data = substream; |
| entry->c.text.read = NULL; |
| entry->c.text.write = snd_pcm_xrun_injection_write; |
| entry->mode = S_IFREG | S_IWUSR; |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| substream->proc_xrun_injection_entry = entry; |
| #endif /* CONFIG_SND_PCM_XRUN_DEBUG */ |
| |
| 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; |
| #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| snd_info_free_entry(substream->proc_xrun_injection_entry); |
| substream->proc_xrun_injection_entry = NULL; |
| #endif |
| 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 */ |
| |
| static const struct attribute_group *pcm_dev_attr_groups[]; |
| |
| /** |
| * 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(). |
| * |
| * Return: 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 IS_ENABLED(CONFIG_SND_PCM_OSS) |
| mutex_init(&pstr->oss.setup_mutex); |
| #endif |
| pstr->stream = stream; |
| pstr->pcm = pcm; |
| pstr->substream_count = substream_count; |
| if (!substream_count) |
| return 0; |
| |
| snd_device_initialize(&pstr->dev, pcm->card); |
| pstr->dev.groups = pcm_dev_attr_groups; |
| dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device, |
| stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); |
| |
| if (!pcm->internal) { |
| err = snd_pcm_stream_proc_init(pstr); |
| if (err < 0) { |
| pcm_err(pcm, "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) |
| 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; |
| |
| if (!pcm->internal) { |
| err = snd_pcm_substream_proc_init(substream); |
| if (err < 0) { |
| pcm_err(pcm, |
| "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); |
| mutex_init(&substream->self_group.mutex); |
| INIT_LIST_HEAD(&substream->self_group.substreams); |
| list_add_tail(&substream->link_list, &substream->self_group.substreams); |
| atomic_set(&substream->mmap_count, 0); |
| prev = substream; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(snd_pcm_new_stream); |
| |
| static int _snd_pcm_new(struct snd_card *card, const char *id, int device, |
| int playback_count, int capture_count, bool internal, |
| 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, |
| }; |
| |
| if (snd_BUG_ON(!card)) |
| return -ENXIO; |
| if (rpcm) |
| *rpcm = NULL; |
| pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
| if (!pcm) |
| return -ENOMEM; |
| pcm->card = card; |
| pcm->device = device; |
| pcm->internal = internal; |
| mutex_init(&pcm->open_mutex); |
| init_waitqueue_head(&pcm->open_wait); |
| INIT_LIST_HEAD(&pcm->list); |
| 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; |
| } |
| if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { |
| snd_pcm_free(pcm); |
| return err; |
| } |
| if (rpcm) |
| *rpcm = pcm; |
| 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(). |
| * |
| * Return: Zero if successful, or a negative error code on failure. |
| */ |
| int snd_pcm_new(struct snd_card *card, const char *id, int device, |
| int playback_count, int capture_count, struct snd_pcm **rpcm) |
| { |
| return _snd_pcm_new(card, id, device, playback_count, capture_count, |
| false, rpcm); |
| } |
| EXPORT_SYMBOL(snd_pcm_new); |
| |
| /** |
| * snd_pcm_new_internal - create a new internal PCM instance |
| * @card: the card instance |
| * @id: the id string |
| * @device: the device index (zero based - shared with normal PCMs) |
| * @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 internal PCM instance with no userspace device or procfs |
| * entries. This is used by ASoC Back End PCMs in order to create a PCM that |
| * will only be used internally by kernel drivers. i.e. it cannot be opened |
| * by userspace. It provides existing ASoC components drivers with a substream |
| * and access to any private data. |
| * |
| * The pcm operators have to be set afterwards to the new instance |
| * via snd_pcm_set_ops(). |
| * |
| * Return: Zero if successful, or a negative error code on failure. |
| */ |
| int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, |
| int playback_count, int capture_count, |
| struct snd_pcm **rpcm) |
| { |
| return _snd_pcm_new(card, id, device, playback_count, capture_count, |
| true, rpcm); |
| } |
| EXPORT_SYMBOL(snd_pcm_new_internal); |
| |
| static void snd_pcm_free_stream(struct snd_pcm_str * pstr) |
| { |
| struct snd_pcm_substream *substream, *substream_next; |
| #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| 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 IS_ENABLED(CONFIG_SND_PCM_OSS) |
| for (setup = pstr->oss.setup_list; setup; setup = setupn) { |
| setupn = setup->next; |
| kfree(setup->task_name); |
| kfree(setup); |
| } |
| #endif |
| if (pstr->substream_count) |
| put_device(&pstr->dev); |
| } |
| |
| static int snd_pcm_free(struct snd_pcm *pcm) |
| { |
| struct snd_pcm_notify *notify; |
| |
| if (!pcm) |
| return 0; |
| if (!pcm->internal) { |
| 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); |
| } |
| |
| 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_card *card; |
| int prefer_subdevice; |
| size_t size; |
| |
| if (snd_BUG_ON(!pcm || !rsubstream)) |
| return -ENXIO; |
| if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK && |
| stream != SNDRV_PCM_STREAM_CAPTURE)) |
| return -EINVAL; |
| *rsubstream = NULL; |
| pstr = &pcm->streams[stream]; |
| if (pstr->substream == NULL || pstr->substream_count == 0) |
| return -ENODEV; |
| |
| card = pcm->card; |
| prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM); |
| |
| if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
| int opposite = !stream; |
| |
| for (substream = pcm->streams[opposite].substream; substream; |
| substream = substream->next) { |
| if (SUBSTREAM_BUSY(substream)) |
| return -EAGAIN; |
| } |
| } |
| |
| 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; |
| } |
| |
| for (substream = pstr->substream; substream; substream = substream->next) { |
| if (!SUBSTREAM_BUSY(substream) && |
| (prefer_subdevice == -1 || |
| substream->number == prefer_subdevice)) |
| break; |
| } |
| 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_waitqueue_head(&runtime->tsleep); |
| |
| 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; |
| substream->pid = get_pid(task_pid(current)); |
| pstr->substream_opened++; |
| *rsubstream = substream; |
| return 0; |
| } |
| |
| void snd_pcm_detach_substream(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime; |
| |
| if (PCM_RUNTIME_CHECK(substream)) |
| return; |
| runtime = substream->runtime; |
| 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); |
| #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| kfree(runtime->hwptr_log); |
| #endif |
| kfree(runtime); |
| substream->runtime = NULL; |
| put_pid(substream->pid); |
| substream->pid = NULL; |
| substream->pstr->substream_opened--; |
| } |
| |
| static ssize_t show_pcm_class(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev); |
| struct snd_pcm *pcm = pstr->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_class > SNDRV_PCM_CLASS_LAST) |
| str = "none"; |
| else |
| str = strs[pcm->dev_class]; |
| return snprintf(buf, PAGE_SIZE, "%s\n", str); |
| } |
| |
| static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); |
| static struct attribute *pcm_dev_attrs[] = { |
| &dev_attr_pcm_class.attr, |
| NULL |
| }; |
| |
| static struct attribute_group pcm_dev_attr_group = { |
| .attrs = pcm_dev_attrs, |
| }; |
| |
| static const struct attribute_group *pcm_dev_attr_groups[] = { |
| &pcm_dev_attr_group, |
| NULL |
| }; |
| |
| static int snd_pcm_dev_register(struct snd_device *device) |
| { |
| int cidx, err; |
| struct snd_pcm_substream *substream; |
| struct snd_pcm_notify *notify; |
| struct snd_pcm *pcm; |
| |
| if (snd_BUG_ON(!device || !device->device_data)) |
| return -ENXIO; |
| pcm = device->device_data; |
| if (pcm->internal) |
| return 0; |
| |
| mutex_lock(®ister_mutex); |
| err = snd_pcm_add(pcm); |
| if (err) |
| goto unlock; |
| for (cidx = 0; cidx < 2; cidx++) { |
| int devtype = -1; |
| if (pcm->streams[cidx].substream == NULL) |
| continue; |
| 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; |
| } |
| /* register pcm */ |
| err = snd_register_device(devtype, pcm->card, pcm->device, |
| &snd_pcm_f_ops[cidx], pcm, |
| &pcm->streams[cidx].dev); |
| if (err < 0) { |
| list_del_init(&pcm->list); |
| goto unlock; |
| } |
| |
| 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); |
| |
| unlock: |
| mutex_unlock(®ister_mutex); |
| return err; |
| } |
| |
| 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; |
| |
| mutex_lock(®ister_mutex); |
| mutex_lock(&pcm->open_mutex); |
| wake_up(&pcm->open_wait); |
| list_del_init(&pcm->list); |
| for (cidx = 0; cidx < 2; cidx++) { |
| for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { |
| snd_pcm_stream_lock_irq(substream); |
| if (substream->runtime) { |
| substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; |
| wake_up(&substream->runtime->sleep); |
| wake_up(&substream->runtime->tsleep); |
| } |
| snd_pcm_stream_unlock_irq(substream); |
| } |
| } |
| if (!pcm->internal) { |
| list_for_each_entry(notify, &snd_pcm_notify_list, list) |
| notify->n_disconnect(pcm); |
| } |
| for (cidx = 0; cidx < 2; cidx++) { |
| if (!pcm->internal) |
| snd_unregister_device(&pcm->streams[cidx].dev); |
| if (pcm->streams[cidx].chmap_kctl) { |
| snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl); |
| pcm->streams[cidx].chmap_kctl = NULL; |
| } |
| } |
| mutex_unlock(&pcm->open_mutex); |
| mutex_unlock(®ister_mutex); |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_notify - Add/remove the notify list |
| * @notify: PCM notify list |
| * @nfree: 0 = register, 1 = unregister |
| * |
| * This adds the given notifier to the global list so that the callback is |
| * called for each registered PCM devices. This exists only for PCM OSS |
| * emulation, so far. |
| */ |
| int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) |
| { |
| struct snd_pcm *pcm; |
| |
| if (snd_BUG_ON(!notify || |
| !notify->n_register || |
| !notify->n_unregister || |
| !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) |