| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jaroslav Kysela | 3567 | 58.93% | 33 | 18.75% |
| Takashi Iwai | 1453 | 24.00% | 55 | 31.25% |
| Linus Torvalds (pre-git) | 259 | 4.28% | 48 | 27.27% |
| Clemens Ladisch | 221 | 3.65% | 4 | 2.27% |
| Pawel Moll | 141 | 2.33% | 1 | 0.57% |
| Liam Girdwood | 117 | 1.93% | 1 | 0.57% |
| SF Markus Elfring | 53 | 0.88% | 2 | 1.14% |
| Johannes Berg | 34 | 0.56% | 2 | 1.14% |
| Dan Carpenter | 32 | 0.53% | 1 | 0.57% |
| Linus Torvalds | 20 | 0.33% | 4 | 2.27% |
| Ingo Molnar | 19 | 0.31% | 1 | 0.57% |
| Akinobu Mita | 19 | 0.31% | 1 | 0.57% |
| Gustavo A. R. Silva | 12 | 0.20% | 1 | 0.57% |
| Al Viro | 12 | 0.20% | 1 | 0.57% |
| Pierre-Louis Bossart | 11 | 0.18% | 1 | 0.57% |
| Jussi Laako | 10 | 0.17% | 1 | 0.57% |
| Daniel Mack | 10 | 0.17% | 1 | 0.57% |
| Julia Lawall | 9 | 0.15% | 1 | 0.57% |
| Baolin Wang | 8 | 0.13% | 1 | 0.57% |
| Greg Kroah-Hartman | 7 | 0.12% | 1 | 0.57% |
| Paul Gortmaker | 6 | 0.10% | 2 | 1.14% |
| Jurgen Kramer | 5 | 0.08% | 1 | 0.57% |
| Jason Zhang | 5 | 0.08% | 1 | 0.57% |
| Joe Perches | 5 | 0.08% | 2 | 1.14% |
| Takashi Sakamoto | 3 | 0.05% | 1 | 0.57% |
| Yacine Belkadi | 3 | 0.05% | 1 | 0.57% |
| Jie Yang | 3 | 0.05% | 1 | 0.57% |
| Thomas Gleixner | 2 | 0.03% | 1 | 0.57% |
| Yue haibing | 2 | 0.03% | 1 | 0.57% |
| Russell King | 2 | 0.03% | 1 | 0.57% |
| Arvind Yadav | 1 | 0.02% | 1 | 0.57% |
| Arnd Bergmann | 1 | 0.02% | 1 | 0.57% |
| Tim Blechmann | 1 | 0.02% | 1 | 0.57% |
| Total | 6053 | 176 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Digital Audio (PCM) abstract layer * Copyright (c) by Jaroslav Kysela <perex@perex.cz> */ #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 <linux/nospec.h> #include <sound/core.h> #include <sound/minors.h> #include <sound/pcm.h> #include <sound/timer.h> #include <sound/control.h> #include <sound/info.h> #include "pcm_local.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 DEFINE_MUTEX(register_mutex); #if IS_ENABLED(CONFIG_SND_PCM_OSS) static LIST_HEAD(snd_pcm_notify_list); #endif 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; stream = array_index_nospec(stream, 2); 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; } mutex_lock(&pcm->open_mutex); err = snd_pcm_info_user(substream, info); mutex_unlock(&pcm->open_mutex); _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 const char * const 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 * * Return: the format name string */ 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 const char * const snd_pcm_stream_names[] = { STREAM(PLAYBACK), STREAM(CAPTURE), }; static const char * const snd_pcm_state_names[] = { STATE(OPEN), STATE(SETUP), STATE(PREPARED), STATE(RUNNING), STATE(XRUN), STATE(DRAINING), STATE(PAUSED), STATE(SUSPENDED), STATE(DISCONNECTED), }; static const char * const snd_pcm_access_names[] = { ACCESS(MMAP_INTERLEAVED), ACCESS(MMAP_NONINTERLEAVED), ACCESS(MMAP_COMPLEX), ACCESS(RW_INTERLEAVED), ACCESS(RW_NONINTERLEAVED), }; static const char * const snd_pcm_subformat_names[] = { SUBFORMAT(STD), }; static const char * const 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->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->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_status64 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_status64(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: %lld.%09lld\n", status.trigger_tstamp_sec, status.trigger_tstamp_nsec); snd_iprintf(buffer, "tstamp : %lld.%09lld\n", status.tstamp_sec, status.tstamp_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; snd_pcm_stop_xrun(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'); entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root); if (!entry) return -ENOMEM; entry->mode = S_IFDIR | 0555; pstr->proc_root = entry; entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root); if (entry) snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); #ifdef CONFIG_SND_PCM_XRUN_DEBUG entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root); if (entry) { snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read); entry->c.text.write = snd_pcm_xrun_debug_write; entry->mode |= 0200; } #endif return 0; } static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { snd_info_free_entry(pstr->proc_root); pstr->proc_root = NULL; return 0; } static struct snd_info_entry * create_substream_info_entry(struct snd_pcm_substream *substream, const char *name, void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) { struct snd_info_entry *entry; entry = snd_info_create_card_entry(substream->pcm->card, name, substream->proc_root); if (entry) snd_info_set_text_ops(entry, substream, read); return entry; } 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); entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root); if (!entry) return -ENOMEM; entry->mode = S_IFDIR | 0555; substream->proc_root = entry; create_substream_info_entry(substream, "info", snd_pcm_substream_proc_info_read); create_substream_info_entry(substream, "hw_params", snd_pcm_substream_proc_hw_params_read); create_substream_info_entry(substream, "sw_params", snd_pcm_substream_proc_sw_params_read); create_substream_info_entry(substream, "status", snd_pcm_substream_proc_status_read); #ifdef CONFIG_SND_PCM_XRUN_DEBUG entry = create_substream_info_entry(substream, "xrun_injection", NULL); if (entry) { entry->c.text.write = snd_pcm_xrun_injection_write; entry->mode = S_IFREG | 0200; } #endif /* CONFIG_SND_PCM_XRUN_DEBUG */ 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; } #endif /* CONFIG_SND_VERBOSE_PROCFS */ static const struct attribute_group *pcm_dev_attr_groups[]; /* * PM callbacks: we need to deal only with suspend here, as the resume is * triggered either from user-space or the driver's resume callback */ #ifdef CONFIG_PM_SLEEP static int do_pcm_suspend(struct device *dev) { struct snd_pcm_str *pstr = dev_get_drvdata(dev); if (!pstr->pcm->no_device_suspend) snd_pcm_suspend_all(pstr->pcm); return 0; } #endif static const struct dev_pm_ops pcm_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL) }; /* device type for PCM -- basically only for passing PM callbacks */ static const struct device_type pcm_dev_type = { .name = "pcm", .pm = &pcm_dev_pm_ops, }; /** * 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; err = snd_device_alloc(&pstr->dev, pcm->card); if (err < 0) return err; dev_set_name(pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device, stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); pstr->dev->groups = pcm_dev_attr_groups; pstr->dev->type = &pcm_dev_type; dev_set_drvdata(pstr->dev, pstr); 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; snd_pcm_group_init(&substream->self_group); 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 const struct snd_device_ops ops = { .dev_free = snd_pcm_dev_free, .dev_register = snd_pcm_dev_register, .dev_disconnect = snd_pcm_dev_disconnect, }; static const struct snd_device_ops internal_ops = { .dev_free = snd_pcm_dev_free, }; 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) strscpy(pcm->id, id, sizeof(pcm->id)); err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count); if (err < 0) goto free_pcm; err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count); if (err < 0) goto free_pcm; err = snd_device_new(card, SNDRV_DEV_PCM, pcm, internal ? &internal_ops : &ops); if (err < 0) goto free_pcm; if (rpcm) *rpcm = pcm; return 0; free_pcm: snd_pcm_free(pcm); return err; } /** * 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 free_chmap(struct snd_pcm_str *pstr) { if (pstr->chmap_kctl) { struct snd_card *card = pstr->pcm->card; snd_ctl_remove(card, pstr->chmap_kctl); pstr->chmap_kctl = NULL; } } 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 /* free all proc files under the stream */ snd_pcm_stream_proc_done(pstr); substream = pstr->substream; while (substream) { substream_next = substream->next; snd_pcm_timer_done(substream); kfree(substream); substream = substream_next; } #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 free_chmap(pstr); if (pstr->substream_count) put_device(pstr->dev); } #if IS_ENABLED(CONFIG_SND_PCM_OSS) #define pcm_call_notify(pcm, call) \ do { \ struct snd_pcm_notify *_notify; \ list_for_each_entry(_notify, &snd_pcm_notify_list, list) \ _notify->call(pcm); \ } while (0) #else #define pcm_call_notify(pcm, call) do {} while (0) #endif static int snd_pcm_free(struct snd_pcm *pcm) { if (!pcm) return 0; if (!pcm->internal) pcm_call_notify(pcm, n_unregister); 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 = alloc_pages_exact(size, GFP_KERNEL); if (runtime->status == NULL) { kfree(runtime); return -ENOMEM; } memset(runtime->status, 0, size); size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); runtime->control = alloc_pages_exact(size, GFP_KERNEL); if (runtime->control == NULL) { free_pages_exact(runtime->status, PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); kfree(runtime); return -ENOMEM; } memset(runtime->control, 0, size); init_waitqueue_head(&runtime->sleep); init_waitqueue_head(&runtime->tsleep); __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_OPEN); mutex_init(&runtime->buffer_mutex); atomic_set(&runtime->buffer_accessing, 0); 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); free_pages_exact(runtime->status, PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); free_pages_exact(runtime->control, PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); kfree(runtime->hw_constraints.rules); /* Avoid concurrent access to runtime via PCM timer interface */ if (substream->timer) { spin_lock_irq(&substream->timer->lock); substream->runtime = NULL; spin_unlock_irq(&substream->timer->lock); } else { substream->runtime = NULL; } mutex_destroy(&runtime->buffer_mutex); snd_fasync_free(runtime->fasync); kfree(runtime); put_pid(substream->pid); substream->pid = NULL; substream->pstr->substream_opened--; } static ssize_t pcm_class_show(struct device *dev, struct device_attribute *attr, char *buf) { struct snd_pcm_str *pstr = dev_get_drvdata(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 sysfs_emit(buf, "%s\n", str); } static DEVICE_ATTR_RO(pcm_class); static struct attribute *pcm_dev_attrs[] = { &dev_attr_pcm_class.attr, NULL }; static const 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 *pcm; if (snd_BUG_ON(!device || !device->device_data)) return -ENXIO; pcm = device->device_data; 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); } pcm_call_notify(pcm, n_register); 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_substream *substream; int cidx; mutex_lock(®ister_mutex); mutex_lock(&pcm->open_mutex); wake_up(&pcm->open_wait); list_del_init(&pcm->list); for_each_pcm_substream(pcm, cidx, substream) { snd_pcm_stream_lock_irq(substream); if (substream->runtime) { if (snd_pcm_running(substream)) snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED); /* to be sure, set the state unconditionally */ __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_DISCONNECTED); wake_up(&substream->runtime->sleep); wake_up(&substream->runtime->tsleep); } snd_pcm_stream_unlock_irq(substream); } for_each_pcm_substream(pcm, cidx, substream) snd_pcm_sync_stop(substream, false); pcm_call_notify(pcm, n_disconnect); for (cidx = 0; cidx < 2; cidx++) { if (pcm->streams[cidx].dev) snd_unregister_device(pcm->streams[cidx].dev); free_chmap(&pcm->streams[cidx]); } mutex_unlock(&pcm->open_mutex); mutex_unlock(®ister_mutex); return 0; } #if IS_ENABLED(CONFIG_SND_PCM_OSS) /** * 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. * * Return: zero if successful, or a negative error code */ 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); #endif /* CONFIG_SND_PCM_OSS */ #ifdef CONFIG_SND_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; entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL); if (entry) { 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_SND_PROC_FS */ #define snd_pcm_proc_init() #define snd_pcm_proc_done() #endif /* CONFIG_SND_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)
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