| /* |
| * Digital Audio (PCM) abstract layer |
| * Copyright (c) by Jaroslav Kysela <perex@suse.cz> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <sound/driver.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/time.h> |
| #include <sound/core.h> |
| #include <sound/minors.h> |
| #include <sound/pcm.h> |
| #include <sound/control.h> |
| #include <sound/info.h> |
| |
| MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>"); |
| MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); |
| MODULE_LICENSE("GPL"); |
| |
| struct snd_pcm *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES]; |
| static LIST_HEAD(snd_pcm_notify_list); |
| static DECLARE_MUTEX(register_mutex); |
| |
| static int snd_pcm_free(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 int snd_pcm_dev_unregister(struct snd_device *device); |
| |
| static int snd_pcm_control_ioctl(struct snd_card *card, |
| struct snd_ctl_file *control, |
| unsigned int cmd, unsigned long arg) |
| { |
| unsigned int tmp; |
| |
| tmp = card->number * SNDRV_PCM_DEVICES; |
| switch (cmd) { |
| case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: |
| { |
| int device; |
| |
| if (get_user(device, (int __user *)arg)) |
| return -EFAULT; |
| device = device < 0 ? 0 : device + 1; |
| while (device < SNDRV_PCM_DEVICES) { |
| if (snd_pcm_devices[tmp + device]) |
| break; |
| device++; |
| } |
| if (device == SNDRV_PCM_DEVICES) |
| device = -1; |
| if (put_user(device, (int __user *)arg)) |
| return -EFAULT; |
| return 0; |
| } |
| case SNDRV_CTL_IOCTL_PCM_INFO: |
| { |
| 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; |
| info = (struct snd_pcm_info __user *)arg; |
| if (get_user(device, &info->device)) |
| return -EFAULT; |
| if (device >= SNDRV_PCM_DEVICES) |
| return -ENXIO; |
| pcm = snd_pcm_devices[tmp + device]; |
| if (pcm == NULL) |
| return -ENXIO; |
| if (get_user(stream, &info->stream)) |
| return -EFAULT; |
| if (stream < 0 || stream > 1) |
| return -EINVAL; |
| pstr = &pcm->streams[stream]; |
| if (pstr->substream_count == 0) |
| return -ENOENT; |
| if (get_user(subdevice, &info->subdevice)) |
| return -EFAULT; |
| if (subdevice >= pstr->substream_count) |
| return -ENXIO; |
| for (substream = pstr->substream; substream; substream = substream->next) |
| if (substream->number == (int)subdevice) |
| break; |
| if (substream == NULL) |
| return -ENXIO; |
| return snd_pcm_info_user(substream, info); |
| } |
| case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: |
| { |
| int val; |
| |
| if (get_user(val, (int __user *)arg)) |
| return -EFAULT; |
| control->prefer_pcm_subdevice = val; |
| return 0; |
| } |
| } |
| return -ENOIOCTLCMD; |
| } |
| #define STATE(v) [SNDRV_PCM_STATE_##v] = #v |
| #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v |
| #define READY(v) [SNDRV_PCM_READY_##v] = #v |
| #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v |
| #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v |
| #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v |
| #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v |
| #define START(v) [SNDRV_PCM_START_##v] = #v |
| #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v |
| #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v |
| |
| static char *snd_pcm_stream_names[] = { |
| STREAM(PLAYBACK), |
| STREAM(CAPTURE), |
| }; |
| |
| static char *snd_pcm_state_names[] = { |
| STATE(OPEN), |
| STATE(SETUP), |
| STATE(PREPARED), |
| STATE(RUNNING), |
| STATE(XRUN), |
| STATE(DRAINING), |
| STATE(PAUSED), |
| STATE(SUSPENDED), |
| }; |
| |
| static char *snd_pcm_access_names[] = { |
| ACCESS(MMAP_INTERLEAVED), |
| ACCESS(MMAP_NONINTERLEAVED), |
| ACCESS(MMAP_COMPLEX), |
| ACCESS(RW_INTERLEAVED), |
| ACCESS(RW_NONINTERLEAVED), |
| }; |
| |
| static char *snd_pcm_format_names[] = { |
| FORMAT(S8), |
| FORMAT(U8), |
| FORMAT(S16_LE), |
| FORMAT(S16_BE), |
| FORMAT(U16_LE), |
| FORMAT(U16_BE), |
| FORMAT(S24_LE), |
| FORMAT(S24_BE), |
| FORMAT(U24_LE), |
| FORMAT(U24_BE), |
| FORMAT(S32_LE), |
| FORMAT(S32_BE), |
| FORMAT(U32_LE), |
| FORMAT(U32_BE), |
| FORMAT(FLOAT_LE), |
| FORMAT(FLOAT_BE), |
| FORMAT(FLOAT64_LE), |
| FORMAT(FLOAT64_BE), |
| FORMAT(IEC958_SUBFRAME_LE), |
| FORMAT(IEC958_SUBFRAME_BE), |
| FORMAT(MU_LAW), |
| FORMAT(A_LAW), |
| FORMAT(IMA_ADPCM), |
| FORMAT(MPEG), |
| FORMAT(GSM), |
| FORMAT(SPECIAL), |
| FORMAT(S24_3LE), |
| FORMAT(S24_3BE), |
| FORMAT(U24_3LE), |
| FORMAT(U24_3BE), |
| FORMAT(S20_3LE), |
| FORMAT(S20_3BE), |
| FORMAT(U20_3LE), |
| FORMAT(U20_3BE), |
| FORMAT(S18_3LE), |
| FORMAT(S18_3BE), |
| FORMAT(U18_3LE), |
| FORMAT(U18_3BE), |
| }; |
| |
| static char *snd_pcm_subformat_names[] = { |
| SUBFORMAT(STD), |
| }; |
| |
| static char *snd_pcm_tstamp_mode_names[] = { |
| TSTAMP(NONE), |
| TSTAMP(MMAP), |
| }; |
| |
| static const char *snd_pcm_stream_name(int stream) |
| { |
| snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL); |
| return snd_pcm_stream_names[stream]; |
| } |
| |
| static const char *snd_pcm_access_name(snd_pcm_access_t access) |
| { |
| return snd_pcm_access_names[access]; |
| } |
| |
| const char *snd_pcm_format_name(snd_pcm_format_t format) |
| { |
| return snd_pcm_format_names[format]; |
| } |
| |
| static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) |
| { |
| return snd_pcm_subformat_names[subformat]; |
| } |
| |
| static const char *snd_pcm_tstamp_mode_name(int mode) |
| { |
| snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL); |
| return snd_pcm_tstamp_mode_names[mode]; |
| } |
| |
| static const char *snd_pcm_state_name(snd_pcm_state_t state) |
| { |
| return snd_pcm_state_names[state]; |
| } |
| |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| #include <linux/soundcard.h> |
| static const char *snd_pcm_oss_format_name(int format) |
| { |
| switch (format) { |
| case AFMT_MU_LAW: |
| return "MU_LAW"; |
| case AFMT_A_LAW: |
| return "A_LAW"; |
| case AFMT_IMA_ADPCM: |
| return "IMA_ADPCM"; |
| case AFMT_U8: |
| return "U8"; |
| case AFMT_S16_LE: |
| return "S16_LE"; |
| case AFMT_S16_BE: |
| return "S16_BE"; |
| case AFMT_S8: |
| return "S8"; |
| case AFMT_U16_LE: |
| return "U16_LE"; |
| case AFMT_U16_BE: |
| return "U16_BE"; |
| case AFMT_MPEG: |
| return "MPEG"; |
| default: |
| return "unknown"; |
| } |
| } |
| #endif |
| |
| #ifdef CONFIG_PROC_FS |
| static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, |
| struct snd_info_buffer *buffer) |
| { |
| struct snd_pcm_info *info; |
| int err; |
| |
| if (! substream) |
| return; |
| |
| info = kmalloc(sizeof(*info), GFP_KERNEL); |
| if (! info) { |
| printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); |
| return; |
| } |
| |
| err = snd_pcm_info(substream, info); |
| if (err < 0) { |
| snd_iprintf(buffer, "error %d\n", err); |
| kfree(info); |
| return; |
| } |
| snd_iprintf(buffer, "card: %d\n", info->card); |
| snd_iprintf(buffer, "device: %d\n", info->device); |
| snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); |
| snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); |
| snd_iprintf(buffer, "id: %s\n", info->id); |
| snd_iprintf(buffer, "name: %s\n", info->name); |
| snd_iprintf(buffer, "subname: %s\n", info->subname); |
| snd_iprintf(buffer, "class: %d\n", info->dev_class); |
| snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); |
| snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); |
| snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); |
| kfree(info); |
| } |
| |
| static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, |
| buffer); |
| } |
| |
| static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data, |
| buffer); |
| } |
| |
| static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| struct snd_pcm_substream *substream = entry->private_data; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| if (!runtime) { |
| snd_iprintf(buffer, "closed\n"); |
| return; |
| } |
| snd_pcm_stream_lock_irq(substream); |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
| snd_iprintf(buffer, "no setup\n"); |
| snd_pcm_stream_unlock_irq(substream); |
| return; |
| } |
| snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); |
| snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); |
| snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); |
| snd_iprintf(buffer, "channels: %u\n", runtime->channels); |
| snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); |
| snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); |
| snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); |
| snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time); |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| if (substream->oss.oss) { |
| snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); |
| snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); |
| snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); |
| snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); |
| snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); |
| snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); |
| } |
| #endif |
| snd_pcm_stream_unlock_irq(substream); |
| } |
| |
| static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| struct snd_pcm_substream *substream = entry->private_data; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| if (!runtime) { |
| snd_iprintf(buffer, "closed\n"); |
| return; |
| } |
| snd_pcm_stream_lock_irq(substream); |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
| snd_iprintf(buffer, "no setup\n"); |
| snd_pcm_stream_unlock_irq(substream); |
| return; |
| } |
| snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); |
| snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); |
| snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min); |
| snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); |
| snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align); |
| snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); |
| snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); |
| snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); |
| snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); |
| snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); |
| snd_pcm_stream_unlock_irq(substream); |
| } |
| |
| static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| struct snd_pcm_substream *substream = entry->private_data; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct snd_pcm_status status; |
| int err; |
| if (!runtime) { |
| snd_iprintf(buffer, "closed\n"); |
| return; |
| } |
| memset(&status, 0, sizeof(status)); |
| err = snd_pcm_status(substream, &status); |
| if (err < 0) { |
| snd_iprintf(buffer, "error %d\n", err); |
| return; |
| } |
| snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); |
| snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", |
| status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); |
| snd_iprintf(buffer, "tstamp : %ld.%09ld\n", |
| status.tstamp.tv_sec, status.tstamp.tv_nsec); |
| snd_iprintf(buffer, "delay : %ld\n", status.delay); |
| snd_iprintf(buffer, "avail : %ld\n", status.avail); |
| snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); |
| snd_iprintf(buffer, "-----\n"); |
| snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); |
| snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); |
| } |
| #endif |
| |
| #ifdef CONFIG_SND_DEBUG |
| static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| struct snd_pcm_str *pstr = entry->private_data; |
| snd_iprintf(buffer, "%d\n", pstr->xrun_debug); |
| } |
| |
| static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| struct snd_pcm_str *pstr = entry->private_data; |
| char line[64]; |
| if (!snd_info_get_line(buffer, line, sizeof(line))) |
| pstr->xrun_debug = simple_strtoul(line, NULL, 10); |
| } |
| #endif |
| |
| static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) |
| { |
| struct snd_pcm *pcm = pstr->pcm; |
| struct snd_info_entry *entry; |
| char name[16]; |
| |
| sprintf(name, "pcm%i%c", pcm->device, |
| pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); |
| if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) |
| return -ENOMEM; |
| entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| return -ENOMEM; |
| } |
| pstr->proc_root = entry; |
| |
| if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { |
| snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read); |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| pstr->proc_info_entry = entry; |
| |
| #ifdef CONFIG_SND_DEBUG |
| if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", |
| pstr->proc_root)) != NULL) { |
| entry->c.text.read_size = 64; |
| entry->c.text.read = snd_pcm_xrun_debug_read; |
| entry->c.text.write_size = 64; |
| entry->c.text.write = snd_pcm_xrun_debug_write; |
| entry->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_DEBUG |
| if (pstr->proc_xrun_debug_entry) { |
| snd_info_unregister(pstr->proc_xrun_debug_entry); |
| pstr->proc_xrun_debug_entry = NULL; |
| } |
| #endif |
| if (pstr->proc_info_entry) { |
| snd_info_unregister(pstr->proc_info_entry); |
| pstr->proc_info_entry = NULL; |
| } |
| if (pstr->proc_root) { |
| snd_info_unregister(pstr->proc_root); |
| pstr->proc_root = NULL; |
| } |
| return 0; |
| } |
| |
| static int snd_pcm_substream_proc_init(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, 256, snd_pcm_substream_proc_info_read); |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| substream->proc_info_entry = entry; |
| |
| if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { |
| snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read); |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| substream->proc_hw_params_entry = entry; |
| |
| if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { |
| snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read); |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| substream->proc_sw_params_entry = entry; |
| |
| if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { |
| snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read); |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| substream->proc_status_entry = entry; |
| |
| return 0; |
| } |
| |
| static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) |
| { |
| if (substream->proc_info_entry) { |
| snd_info_unregister(substream->proc_info_entry); |
| substream->proc_info_entry = NULL; |
| } |
| if (substream->proc_hw_params_entry) { |
| snd_info_unregister(substream->proc_hw_params_entry); |
| substream->proc_hw_params_entry = NULL; |
| } |
| if (substream->proc_sw_params_entry) { |
| snd_info_unregister(substream->proc_sw_params_entry); |
| substream->proc_sw_params_entry = NULL; |
| } |
| if (substream->proc_status_entry) { |
| snd_info_unregister(substream->proc_status_entry); |
| substream->proc_status_entry = NULL; |
| } |
| if (substream->proc_root) { |
| snd_info_unregister(substream->proc_root); |
| substream->proc_root = NULL; |
| } |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_new_stream - create a new PCM stream |
| * @pcm: the pcm instance |
| * @stream: the stream direction, SNDRV_PCM_STREAM_XXX |
| * @substream_count: the number of substreams |
| * |
| * Creates a new stream for the pcm. |
| * The corresponding stream on the pcm must have been empty before |
| * calling this, i.e. zero must be given to the argument of |
| * snd_pcm_new(). |
| * |
| * Returns zero if successful, or a negative error code on failure. |
| */ |
| int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) |
| { |
| int idx, err; |
| struct snd_pcm_str *pstr = &pcm->streams[stream]; |
| struct snd_pcm_substream *substream, *prev; |
| |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| init_MUTEX(&pstr->oss.setup_mutex); |
| #endif |
| pstr->stream = stream; |
| pstr->pcm = pcm; |
| pstr->substream_count = substream_count; |
| pstr->reg = &snd_pcm_reg[stream]; |
| if (substream_count > 0) { |
| err = snd_pcm_stream_proc_init(pstr); |
| if (err < 0) |
| return err; |
| } |
| prev = NULL; |
| for (idx = 0, prev = NULL; idx < substream_count; idx++) { |
| substream = kzalloc(sizeof(*substream), GFP_KERNEL); |
| if (substream == NULL) |
| return -ENOMEM; |
| substream->pcm = pcm; |
| substream->pstr = pstr; |
| substream->number = idx; |
| substream->stream = stream; |
| sprintf(substream->name, "subdevice #%i", idx); |
| substream->buffer_bytes_max = UINT_MAX; |
| if (prev == NULL) |
| pstr->substream = substream; |
| else |
| prev->next = substream; |
| err = snd_pcm_substream_proc_init(substream); |
| if (err < 0) { |
| kfree(substream); |
| return err; |
| } |
| substream->group = &substream->self_group; |
| spin_lock_init(&substream->self_group.lock); |
| INIT_LIST_HEAD(&substream->self_group.substreams); |
| list_add_tail(&substream->link_list, &substream->self_group.substreams); |
| spin_lock_init(&substream->timer_lock); |
| prev = substream; |
| } |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_new - create a new PCM instance |
| * @card: the card instance |
| * @id: the id string |
| * @device: the device index (zero based) |
| * @playback_count: the number of substreams for playback |
| * @capture_count: the number of substreams for capture |
| * @rpcm: the pointer to store the new pcm instance |
| * |
| * Creates a new PCM instance. |
| * |
| * The pcm operators have to be set afterwards to the new instance |
| * via snd_pcm_set_ops(). |
| * |
| * Returns zero if successful, or a negative error code on failure. |
| */ |
| int snd_pcm_new(struct snd_card *card, char *id, int device, |
| int playback_count, int capture_count, |
| struct snd_pcm ** rpcm) |
| { |
| struct snd_pcm *pcm; |
| int err; |
| static struct snd_device_ops ops = { |
| .dev_free = snd_pcm_dev_free, |
| .dev_register = snd_pcm_dev_register, |
| .dev_disconnect = snd_pcm_dev_disconnect, |
| .dev_unregister = snd_pcm_dev_unregister |
| }; |
| |
| snd_assert(rpcm != NULL, return -EINVAL); |
| *rpcm = NULL; |
| snd_assert(card != NULL, return -ENXIO); |
| pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
| if (pcm == NULL) |
| return -ENOMEM; |
| pcm->card = card; |
| pcm->device = device; |
| if (id) { |
| strlcpy(pcm->id, id, sizeof(pcm->id)); |
| } |
| if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { |
| snd_pcm_free(pcm); |
| return err; |
| } |
| if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { |
| snd_pcm_free(pcm); |
| return err; |
| } |
| init_MUTEX(&pcm->open_mutex); |
| init_waitqueue_head(&pcm->open_wait); |
| if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { |
| snd_pcm_free(pcm); |
| return err; |
| } |
| *rpcm = pcm; |
| return 0; |
| } |
| |
| static void snd_pcm_free_stream(struct snd_pcm_str * pstr) |
| { |
| struct snd_pcm_substream *substream, *substream_next; |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| struct snd_pcm_oss_setup *setup, *setupn; |
| #endif |
| substream = pstr->substream; |
| while (substream) { |
| substream_next = substream->next; |
| snd_pcm_substream_proc_done(substream); |
| kfree(substream); |
| substream = substream_next; |
| } |
| snd_pcm_stream_proc_done(pstr); |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| for (setup = pstr->oss.setup_list; setup; setup = setupn) { |
| setupn = setup->next; |
| kfree(setup->task_name); |
| kfree(setup); |
| } |
| #endif |
| } |
| |
| static int snd_pcm_free(struct snd_pcm *pcm) |
| { |
| snd_assert(pcm != NULL, return -ENXIO); |
| if (pcm->private_free) |
| pcm->private_free(pcm); |
| snd_pcm_lib_preallocate_free_for_all(pcm); |
| snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); |
| snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); |
| kfree(pcm); |
| return 0; |
| } |
| |
| static int snd_pcm_dev_free(struct snd_device *device) |
| { |
| struct snd_pcm *pcm = device->device_data; |
| return snd_pcm_free(pcm); |
| } |
| |
| static void snd_pcm_tick_timer_func(unsigned long data) |
| { |
| struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data; |
| snd_pcm_tick_elapsed(substream); |
| } |
| |
| int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, |
| struct snd_pcm_substream **rsubstream) |
| { |
| struct snd_pcm_str * pstr; |
| struct snd_pcm_substream *substream; |
| struct snd_pcm_runtime *runtime; |
| struct snd_ctl_file *kctl; |
| struct snd_card *card; |
| struct list_head *list; |
| int prefer_subdevice = -1; |
| size_t size; |
| |
| snd_assert(rsubstream != NULL, return -EINVAL); |
| *rsubstream = NULL; |
| snd_assert(pcm != NULL, return -ENXIO); |
| pstr = &pcm->streams[stream]; |
| if (pstr->substream == NULL) |
| return -ENODEV; |
| |
| card = pcm->card; |
| down_read(&card->controls_rwsem); |
| list_for_each(list, &card->ctl_files) { |
| kctl = snd_ctl_file(list); |
| if (kctl->pid == current->pid) { |
| prefer_subdevice = kctl->prefer_pcm_subdevice; |
| break; |
| } |
| } |
| up_read(&card->controls_rwsem); |
| |
| if (pstr->substream_count == 0) |
| return -ENODEV; |
| switch (stream) { |
| case SNDRV_PCM_STREAM_PLAYBACK: |
| if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
| for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { |
| if (SUBSTREAM_BUSY(substream)) |
| return -EAGAIN; |
| } |
| } |
| break; |
| case SNDRV_PCM_STREAM_CAPTURE: |
| if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
| for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { |
| if (SUBSTREAM_BUSY(substream)) |
| return -EAGAIN; |
| } |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (prefer_subdevice >= 0) { |
| for (substream = pstr->substream; substream; substream = substream->next) |
| if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) |
| goto __ok; |
| } |
| for (substream = pstr->substream; substream; substream = substream->next) |
| if (!SUBSTREAM_BUSY(substream)) |
| break; |
| __ok: |
| if (substream == NULL) |
| return -EAGAIN; |
| |
| runtime = 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); |
| atomic_set(&runtime->mmap_count, 0); |
| init_timer(&runtime->tick_timer); |
| runtime->tick_timer.function = snd_pcm_tick_timer_func; |
| runtime->tick_timer.data = (unsigned long) substream; |
| |
| runtime->status->state = SNDRV_PCM_STATE_OPEN; |
| |
| substream->runtime = runtime; |
| substream->private_data = pcm->private_data; |
| pstr->substream_opened++; |
| *rsubstream = substream; |
| return 0; |
| } |
| |
| void snd_pcm_release_substream(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime; |
| substream->file = NULL; |
| runtime = substream->runtime; |
| snd_assert(runtime != NULL, return); |
| if (runtime->private_free != NULL) |
| runtime->private_free(runtime); |
| snd_free_pages((void*)runtime->status, |
| PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); |
| snd_free_pages((void*)runtime->control, |
| PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); |
| kfree(runtime->hw_constraints.rules); |
| kfree(runtime); |
| substream->runtime = NULL; |
| substream->pstr->substream_opened--; |
| } |
| |
| static int snd_pcm_dev_register(struct snd_device *device) |
| { |
| int idx, cidx, err; |
| unsigned short minor; |
| struct snd_pcm_substream *substream; |
| struct list_head *list; |
| char str[16]; |
| struct snd_pcm *pcm = device->device_data; |
| |
| snd_assert(pcm != NULL && device != NULL, return -ENXIO); |
| down(®ister_mutex); |
| idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; |
| if (snd_pcm_devices[idx]) { |
| up(®ister_mutex); |
| return -EBUSY; |
| } |
| snd_pcm_devices[idx] = pcm; |
| for (cidx = 0; cidx < 2; cidx++) { |
| int devtype = -1; |
| if (pcm->streams[cidx].substream == NULL) |
| continue; |
| switch (cidx) { |
| case SNDRV_PCM_STREAM_PLAYBACK: |
| sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); |
| minor = SNDRV_MINOR_PCM_PLAYBACK + idx; |
| devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; |
| break; |
| case SNDRV_PCM_STREAM_CAPTURE: |
| sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); |
| minor = SNDRV_MINOR_PCM_CAPTURE + idx; |
| devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; |
| break; |
| } |
| if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) { |
| snd_pcm_devices[idx] = NULL; |
| up(®ister_mutex); |
| return err; |
| } |
| for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) |
| snd_pcm_timer_init(substream); |
| } |
| list_for_each(list, &snd_pcm_notify_list) { |
| struct snd_pcm_notify *notify; |
| notify = list_entry(list, struct snd_pcm_notify, list); |
| notify->n_register(pcm); |
| } |
| up(®ister_mutex); |
| return 0; |
| } |
| |
| static int snd_pcm_dev_disconnect(struct snd_device *device) |
| { |
| struct snd_pcm *pcm = device->device_data; |
| struct list_head *list; |
| struct snd_pcm_substream *substream; |
| int idx, cidx; |
| |
| down(®ister_mutex); |
| idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; |
| snd_pcm_devices[idx] = NULL; |
| for (cidx = 0; cidx < 2; cidx++) |
| for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) |
| if (substream->runtime) |
| substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; |
| list_for_each(list, &snd_pcm_notify_list) { |
| struct snd_pcm_notify *notify; |
| notify = list_entry(list, struct snd_pcm_notify, list); |
| notify->n_disconnect(pcm); |
| } |
| up(®ister_mutex); |
| return 0; |
| } |
| |
| static int snd_pcm_dev_unregister(struct snd_device *device) |
| { |
| int idx, cidx, devtype; |
| struct snd_pcm_substream *substream; |
| struct list_head *list; |
| struct snd_pcm *pcm = device->device_data; |
| |
| snd_assert(pcm != NULL, return -ENXIO); |
| down(®ister_mutex); |
| idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; |
| snd_pcm_devices[idx] = NULL; |
| for (cidx = 0; cidx < 2; cidx++) { |
| devtype = -1; |
| switch (cidx) { |
| case SNDRV_PCM_STREAM_PLAYBACK: |
| devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; |
| break; |
| case SNDRV_PCM_STREAM_CAPTURE: |
| devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; |
| break; |
| } |
| snd_unregister_device(devtype, pcm->card, pcm->device); |
| for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) |
| snd_pcm_timer_done(substream); |
| } |
| list_for_each(list, &snd_pcm_notify_list) { |
| struct snd_pcm_notify *notify; |
| notify = list_entry(list, struct snd_pcm_notify, list); |
| notify->n_unregister(pcm); |
| } |
| up(®ister_mutex); |
| return snd_pcm_free(pcm); |
| } |
| |
| int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) |
| { |
| int idx; |
| |
| snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); |
| down(®ister_mutex); |
| if (nfree) { |
| list_del(¬ify->list); |
| for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { |
| if (snd_pcm_devices[idx] == NULL) |
| continue; |
| notify->n_unregister(snd_pcm_devices[idx]); |
| } |
| } else { |
| list_add_tail(¬ify->list, &snd_pcm_notify_list); |
| for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { |
| if (snd_pcm_devices[idx] == NULL) |
| continue; |
| notify->n_register(snd_pcm_devices[idx]); |
| } |
| } |
| up(®ister_mutex); |
| return 0; |
| } |
| |
| /* |
| * Info interface |
| */ |
| |
| static void snd_pcm_proc_read(struct snd_info_entry *entry, |
| struct snd_info_buffer *buffer) |
| { |
| int idx; |
| struct snd_pcm *pcm; |
| |
| down(®ister_mutex); |
| for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { |
| pcm = snd_pcm_devices[idx]; |
| if (pcm == NULL) |
| continue; |
| snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES, |
| idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name); |
| if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) |
| snd_iprintf(buffer, " : playback %i", |
| pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); |
| if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) |
| snd_iprintf(buffer, " : capture %i", |
| pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); |
| snd_iprintf(buffer, "\n"); |
| } |
| up(®ister_mutex); |
| } |
| |
| /* |
| * ENTRY functions |
| */ |
| |
| static struct snd_info_entry *snd_pcm_proc_entry = NULL; |
| |
| static int __init alsa_pcm_init(void) |
| { |
| struct snd_info_entry *entry; |
| |
| snd_ctl_register_ioctl(snd_pcm_control_ioctl); |
| snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); |
| if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { |
| snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, |
| snd_pcm_proc_read); |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| snd_pcm_proc_entry = entry; |
| return 0; |
| } |
| |
| static void __exit alsa_pcm_exit(void) |
| { |
| snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); |
| snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); |
| if (snd_pcm_proc_entry) { |
| snd_info_unregister(snd_pcm_proc_entry); |
| snd_pcm_proc_entry = NULL; |
| } |
| } |
| |
| module_init(alsa_pcm_init) |
| module_exit(alsa_pcm_exit) |
| |
| EXPORT_SYMBOL(snd_pcm_devices); |
| EXPORT_SYMBOL(snd_pcm_new); |
| EXPORT_SYMBOL(snd_pcm_new_stream); |
| EXPORT_SYMBOL(snd_pcm_notify); |
| EXPORT_SYMBOL(snd_pcm_open_substream); |
| EXPORT_SYMBOL(snd_pcm_release_substream); |
| EXPORT_SYMBOL(snd_pcm_format_name); |
| /* pcm_native.c */ |
| EXPORT_SYMBOL(snd_pcm_link_rwlock); |
| #ifdef CONFIG_PM |
| EXPORT_SYMBOL(snd_pcm_suspend); |
| EXPORT_SYMBOL(snd_pcm_suspend_all); |
| #endif |
| EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl); |
| EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl); |
| EXPORT_SYMBOL(snd_pcm_kernel_ioctl); |
| EXPORT_SYMBOL(snd_pcm_mmap_data); |
| #if SNDRV_PCM_INFO_MMAP_IOMEM |
| EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); |
| #endif |
| /* pcm_misc.c */ |
| EXPORT_SYMBOL(snd_pcm_format_signed); |
| EXPORT_SYMBOL(snd_pcm_format_unsigned); |
| EXPORT_SYMBOL(snd_pcm_format_linear); |
| EXPORT_SYMBOL(snd_pcm_format_little_endian); |
| EXPORT_SYMBOL(snd_pcm_format_big_endian); |
| EXPORT_SYMBOL(snd_pcm_format_width); |
| EXPORT_SYMBOL(snd_pcm_format_physical_width); |
| EXPORT_SYMBOL(snd_pcm_format_size); |
| EXPORT_SYMBOL(snd_pcm_format_silence_64); |
| EXPORT_SYMBOL(snd_pcm_format_set_silence); |
| EXPORT_SYMBOL(snd_pcm_build_linear_format); |
| EXPORT_SYMBOL(snd_pcm_limit_hw_rates); |