diff options
Diffstat (limited to 'sound/core/pcm.c')
| -rw-r--r-- | sound/core/pcm.c | 1247 |
1 files changed, 1247 insertions, 0 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c new file mode 100644 index 000000000..2415a3c3a --- /dev/null +++ b/sound/core/pcm.c @@ -0,0 +1,1247 @@ +// 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 = container_of(dev, struct snd_pcm_str, 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; + + snd_device_initialize(&pstr->dev, pcm->card); + pstr->dev.groups = pcm_dev_attr_groups; + pstr->dev.type = &pcm_dev_type; + 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; + 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; + + down_write(&card->controls_rwsem); + snd_ctl_remove(card, pstr->chmap_kctl); + up_write(&card->controls_rwsem); + 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 = 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 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++) { + 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) |