| 1 | /* |
| 2 | * Digital Audio (PCM) abstract layer |
| 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| 4 | * |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/time.h> |
| 26 | #include <linux/mutex.h> |
| 27 | #include <linux/device.h> |
| 28 | #include <sound/core.h> |
| 29 | #include <sound/minors.h> |
| 30 | #include <sound/pcm.h> |
| 31 | #include <sound/control.h> |
| 32 | #include <sound/info.h> |
| 33 | |
| 34 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); |
| 35 | MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); |
| 36 | MODULE_LICENSE("GPL"); |
| 37 | |
| 38 | static LIST_HEAD(snd_pcm_devices); |
| 39 | static LIST_HEAD(snd_pcm_notify_list); |
| 40 | static DEFINE_MUTEX(register_mutex); |
| 41 | |
| 42 | static int snd_pcm_free(struct snd_pcm *pcm); |
| 43 | static int snd_pcm_dev_free(struct snd_device *device); |
| 44 | static int snd_pcm_dev_register(struct snd_device *device); |
| 45 | static int snd_pcm_dev_disconnect(struct snd_device *device); |
| 46 | |
| 47 | static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) |
| 48 | { |
| 49 | struct snd_pcm *pcm; |
| 50 | |
| 51 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
| 52 | if (pcm->card == card && pcm->device == device) |
| 53 | return pcm; |
| 54 | } |
| 55 | return NULL; |
| 56 | } |
| 57 | |
| 58 | static int snd_pcm_next(struct snd_card *card, int device) |
| 59 | { |
| 60 | struct snd_pcm *pcm; |
| 61 | |
| 62 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
| 63 | if (pcm->card == card && pcm->device > device) |
| 64 | return pcm->device; |
| 65 | else if (pcm->card->number > card->number) |
| 66 | return -1; |
| 67 | } |
| 68 | return -1; |
| 69 | } |
| 70 | |
| 71 | static int snd_pcm_add(struct snd_pcm *newpcm) |
| 72 | { |
| 73 | struct snd_pcm *pcm; |
| 74 | |
| 75 | if (newpcm->internal) |
| 76 | return 0; |
| 77 | |
| 78 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
| 79 | if (pcm->card == newpcm->card && pcm->device == newpcm->device) |
| 80 | return -EBUSY; |
| 81 | if (pcm->card->number > newpcm->card->number || |
| 82 | (pcm->card == newpcm->card && |
| 83 | pcm->device > newpcm->device)) { |
| 84 | list_add(&newpcm->list, pcm->list.prev); |
| 85 | return 0; |
| 86 | } |
| 87 | } |
| 88 | list_add_tail(&newpcm->list, &snd_pcm_devices); |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static int snd_pcm_control_ioctl(struct snd_card *card, |
| 93 | struct snd_ctl_file *control, |
| 94 | unsigned int cmd, unsigned long arg) |
| 95 | { |
| 96 | switch (cmd) { |
| 97 | case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: |
| 98 | { |
| 99 | int device; |
| 100 | |
| 101 | if (get_user(device, (int __user *)arg)) |
| 102 | return -EFAULT; |
| 103 | mutex_lock(®ister_mutex); |
| 104 | device = snd_pcm_next(card, device); |
| 105 | mutex_unlock(®ister_mutex); |
| 106 | if (put_user(device, (int __user *)arg)) |
| 107 | return -EFAULT; |
| 108 | return 0; |
| 109 | } |
| 110 | case SNDRV_CTL_IOCTL_PCM_INFO: |
| 111 | { |
| 112 | struct snd_pcm_info __user *info; |
| 113 | unsigned int device, subdevice; |
| 114 | int stream; |
| 115 | struct snd_pcm *pcm; |
| 116 | struct snd_pcm_str *pstr; |
| 117 | struct snd_pcm_substream *substream; |
| 118 | int err; |
| 119 | |
| 120 | info = (struct snd_pcm_info __user *)arg; |
| 121 | if (get_user(device, &info->device)) |
| 122 | return -EFAULT; |
| 123 | if (get_user(stream, &info->stream)) |
| 124 | return -EFAULT; |
| 125 | if (stream < 0 || stream > 1) |
| 126 | return -EINVAL; |
| 127 | if (get_user(subdevice, &info->subdevice)) |
| 128 | return -EFAULT; |
| 129 | mutex_lock(®ister_mutex); |
| 130 | pcm = snd_pcm_get(card, device); |
| 131 | if (pcm == NULL) { |
| 132 | err = -ENXIO; |
| 133 | goto _error; |
| 134 | } |
| 135 | pstr = &pcm->streams[stream]; |
| 136 | if (pstr->substream_count == 0) { |
| 137 | err = -ENOENT; |
| 138 | goto _error; |
| 139 | } |
| 140 | if (subdevice >= pstr->substream_count) { |
| 141 | err = -ENXIO; |
| 142 | goto _error; |
| 143 | } |
| 144 | for (substream = pstr->substream; substream; |
| 145 | substream = substream->next) |
| 146 | if (substream->number == (int)subdevice) |
| 147 | break; |
| 148 | if (substream == NULL) { |
| 149 | err = -ENXIO; |
| 150 | goto _error; |
| 151 | } |
| 152 | err = snd_pcm_info_user(substream, info); |
| 153 | _error: |
| 154 | mutex_unlock(®ister_mutex); |
| 155 | return err; |
| 156 | } |
| 157 | case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: |
| 158 | { |
| 159 | int val; |
| 160 | |
| 161 | if (get_user(val, (int __user *)arg)) |
| 162 | return -EFAULT; |
| 163 | control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val; |
| 164 | return 0; |
| 165 | } |
| 166 | } |
| 167 | return -ENOIOCTLCMD; |
| 168 | } |
| 169 | |
| 170 | #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v |
| 171 | |
| 172 | static char *snd_pcm_format_names[] = { |
| 173 | FORMAT(S8), |
| 174 | FORMAT(U8), |
| 175 | FORMAT(S16_LE), |
| 176 | FORMAT(S16_BE), |
| 177 | FORMAT(U16_LE), |
| 178 | FORMAT(U16_BE), |
| 179 | FORMAT(S24_LE), |
| 180 | FORMAT(S24_BE), |
| 181 | FORMAT(U24_LE), |
| 182 | FORMAT(U24_BE), |
| 183 | FORMAT(S32_LE), |
| 184 | FORMAT(S32_BE), |
| 185 | FORMAT(U32_LE), |
| 186 | FORMAT(U32_BE), |
| 187 | FORMAT(FLOAT_LE), |
| 188 | FORMAT(FLOAT_BE), |
| 189 | FORMAT(FLOAT64_LE), |
| 190 | FORMAT(FLOAT64_BE), |
| 191 | FORMAT(IEC958_SUBFRAME_LE), |
| 192 | FORMAT(IEC958_SUBFRAME_BE), |
| 193 | FORMAT(MU_LAW), |
| 194 | FORMAT(A_LAW), |
| 195 | FORMAT(IMA_ADPCM), |
| 196 | FORMAT(MPEG), |
| 197 | FORMAT(GSM), |
| 198 | FORMAT(SPECIAL), |
| 199 | FORMAT(S24_3LE), |
| 200 | FORMAT(S24_3BE), |
| 201 | FORMAT(U24_3LE), |
| 202 | FORMAT(U24_3BE), |
| 203 | FORMAT(S20_3LE), |
| 204 | FORMAT(S20_3BE), |
| 205 | FORMAT(U20_3LE), |
| 206 | FORMAT(U20_3BE), |
| 207 | FORMAT(S18_3LE), |
| 208 | FORMAT(S18_3BE), |
| 209 | FORMAT(U18_3LE), |
| 210 | FORMAT(U18_3BE), |
| 211 | FORMAT(G723_24), |
| 212 | FORMAT(G723_24_1B), |
| 213 | FORMAT(G723_40), |
| 214 | FORMAT(G723_40_1B), |
| 215 | FORMAT(DSD_U8), |
| 216 | FORMAT(DSD_U16_LE), |
| 217 | FORMAT(DSD_U32_LE), |
| 218 | FORMAT(DSD_U16_BE), |
| 219 | FORMAT(DSD_U32_BE), |
| 220 | }; |
| 221 | |
| 222 | /** |
| 223 | * snd_pcm_format_name - Return a name string for the given PCM format |
| 224 | * @format: PCM format |
| 225 | */ |
| 226 | const char *snd_pcm_format_name(snd_pcm_format_t format) |
| 227 | { |
| 228 | if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) |
| 229 | return "Unknown"; |
| 230 | return snd_pcm_format_names[(__force unsigned int)format]; |
| 231 | } |
| 232 | EXPORT_SYMBOL_GPL(snd_pcm_format_name); |
| 233 | |
| 234 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
| 235 | |
| 236 | #define STATE(v) [SNDRV_PCM_STATE_##v] = #v |
| 237 | #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v |
| 238 | #define READY(v) [SNDRV_PCM_READY_##v] = #v |
| 239 | #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v |
| 240 | #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v |
| 241 | #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v |
| 242 | #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v |
| 243 | #define START(v) [SNDRV_PCM_START_##v] = #v |
| 244 | #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v |
| 245 | |
| 246 | static char *snd_pcm_stream_names[] = { |
| 247 | STREAM(PLAYBACK), |
| 248 | STREAM(CAPTURE), |
| 249 | }; |
| 250 | |
| 251 | static char *snd_pcm_state_names[] = { |
| 252 | STATE(OPEN), |
| 253 | STATE(SETUP), |
| 254 | STATE(PREPARED), |
| 255 | STATE(RUNNING), |
| 256 | STATE(XRUN), |
| 257 | STATE(DRAINING), |
| 258 | STATE(PAUSED), |
| 259 | STATE(SUSPENDED), |
| 260 | }; |
| 261 | |
| 262 | static char *snd_pcm_access_names[] = { |
| 263 | ACCESS(MMAP_INTERLEAVED), |
| 264 | ACCESS(MMAP_NONINTERLEAVED), |
| 265 | ACCESS(MMAP_COMPLEX), |
| 266 | ACCESS(RW_INTERLEAVED), |
| 267 | ACCESS(RW_NONINTERLEAVED), |
| 268 | }; |
| 269 | |
| 270 | static char *snd_pcm_subformat_names[] = { |
| 271 | SUBFORMAT(STD), |
| 272 | }; |
| 273 | |
| 274 | static char *snd_pcm_tstamp_mode_names[] = { |
| 275 | TSTAMP(NONE), |
| 276 | TSTAMP(ENABLE), |
| 277 | }; |
| 278 | |
| 279 | static const char *snd_pcm_stream_name(int stream) |
| 280 | { |
| 281 | return snd_pcm_stream_names[stream]; |
| 282 | } |
| 283 | |
| 284 | static const char *snd_pcm_access_name(snd_pcm_access_t access) |
| 285 | { |
| 286 | return snd_pcm_access_names[(__force int)access]; |
| 287 | } |
| 288 | |
| 289 | static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) |
| 290 | { |
| 291 | return snd_pcm_subformat_names[(__force int)subformat]; |
| 292 | } |
| 293 | |
| 294 | static const char *snd_pcm_tstamp_mode_name(int mode) |
| 295 | { |
| 296 | return snd_pcm_tstamp_mode_names[mode]; |
| 297 | } |
| 298 | |
| 299 | static const char *snd_pcm_state_name(snd_pcm_state_t state) |
| 300 | { |
| 301 | return snd_pcm_state_names[(__force int)state]; |
| 302 | } |
| 303 | |
| 304 | #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| 305 | #include <linux/soundcard.h> |
| 306 | |
| 307 | static const char *snd_pcm_oss_format_name(int format) |
| 308 | { |
| 309 | switch (format) { |
| 310 | case AFMT_MU_LAW: |
| 311 | return "MU_LAW"; |
| 312 | case AFMT_A_LAW: |
| 313 | return "A_LAW"; |
| 314 | case AFMT_IMA_ADPCM: |
| 315 | return "IMA_ADPCM"; |
| 316 | case AFMT_U8: |
| 317 | return "U8"; |
| 318 | case AFMT_S16_LE: |
| 319 | return "S16_LE"; |
| 320 | case AFMT_S16_BE: |
| 321 | return "S16_BE"; |
| 322 | case AFMT_S8: |
| 323 | return "S8"; |
| 324 | case AFMT_U16_LE: |
| 325 | return "U16_LE"; |
| 326 | case AFMT_U16_BE: |
| 327 | return "U16_BE"; |
| 328 | case AFMT_MPEG: |
| 329 | return "MPEG"; |
| 330 | default: |
| 331 | return "unknown"; |
| 332 | } |
| 333 | } |
| 334 | #endif |
| 335 | |
| 336 | static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, |
| 337 | struct snd_info_buffer *buffer) |
| 338 | { |
| 339 | struct snd_pcm_info *info; |
| 340 | int err; |
| 341 | |
| 342 | if (! substream) |
| 343 | return; |
| 344 | |
| 345 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
| 346 | if (!info) |
| 347 | return; |
| 348 | |
| 349 | err = snd_pcm_info(substream, info); |
| 350 | if (err < 0) { |
| 351 | snd_iprintf(buffer, "error %d\n", err); |
| 352 | kfree(info); |
| 353 | return; |
| 354 | } |
| 355 | snd_iprintf(buffer, "card: %d\n", info->card); |
| 356 | snd_iprintf(buffer, "device: %d\n", info->device); |
| 357 | snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); |
| 358 | snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); |
| 359 | snd_iprintf(buffer, "id: %s\n", info->id); |
| 360 | snd_iprintf(buffer, "name: %s\n", info->name); |
| 361 | snd_iprintf(buffer, "subname: %s\n", info->subname); |
| 362 | snd_iprintf(buffer, "class: %d\n", info->dev_class); |
| 363 | snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); |
| 364 | snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); |
| 365 | snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); |
| 366 | kfree(info); |
| 367 | } |
| 368 | |
| 369 | static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, |
| 370 | struct snd_info_buffer *buffer) |
| 371 | { |
| 372 | snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, |
| 373 | buffer); |
| 374 | } |
| 375 | |
| 376 | static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, |
| 377 | struct snd_info_buffer *buffer) |
| 378 | { |
| 379 | snd_pcm_proc_info_read(entry->private_data, buffer); |
| 380 | } |
| 381 | |
| 382 | static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, |
| 383 | struct snd_info_buffer *buffer) |
| 384 | { |
| 385 | struct snd_pcm_substream *substream = entry->private_data; |
| 386 | struct snd_pcm_runtime *runtime; |
| 387 | |
| 388 | mutex_lock(&substream->pcm->open_mutex); |
| 389 | runtime = substream->runtime; |
| 390 | if (!runtime) { |
| 391 | snd_iprintf(buffer, "closed\n"); |
| 392 | goto unlock; |
| 393 | } |
| 394 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
| 395 | snd_iprintf(buffer, "no setup\n"); |
| 396 | goto unlock; |
| 397 | } |
| 398 | snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); |
| 399 | snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); |
| 400 | snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); |
| 401 | snd_iprintf(buffer, "channels: %u\n", runtime->channels); |
| 402 | snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); |
| 403 | snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); |
| 404 | snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); |
| 405 | #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| 406 | if (substream->oss.oss) { |
| 407 | snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); |
| 408 | snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); |
| 409 | snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); |
| 410 | snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); |
| 411 | snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); |
| 412 | snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); |
| 413 | } |
| 414 | #endif |
| 415 | unlock: |
| 416 | mutex_unlock(&substream->pcm->open_mutex); |
| 417 | } |
| 418 | |
| 419 | static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, |
| 420 | struct snd_info_buffer *buffer) |
| 421 | { |
| 422 | struct snd_pcm_substream *substream = entry->private_data; |
| 423 | struct snd_pcm_runtime *runtime; |
| 424 | |
| 425 | mutex_lock(&substream->pcm->open_mutex); |
| 426 | runtime = substream->runtime; |
| 427 | if (!runtime) { |
| 428 | snd_iprintf(buffer, "closed\n"); |
| 429 | goto unlock; |
| 430 | } |
| 431 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
| 432 | snd_iprintf(buffer, "no setup\n"); |
| 433 | goto unlock; |
| 434 | } |
| 435 | snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); |
| 436 | snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); |
| 437 | snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); |
| 438 | snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); |
| 439 | snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); |
| 440 | snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); |
| 441 | snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); |
| 442 | snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); |
| 443 | unlock: |
| 444 | mutex_unlock(&substream->pcm->open_mutex); |
| 445 | } |
| 446 | |
| 447 | static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, |
| 448 | struct snd_info_buffer *buffer) |
| 449 | { |
| 450 | struct snd_pcm_substream *substream = entry->private_data; |
| 451 | struct snd_pcm_runtime *runtime; |
| 452 | struct snd_pcm_status status; |
| 453 | int err; |
| 454 | |
| 455 | mutex_lock(&substream->pcm->open_mutex); |
| 456 | runtime = substream->runtime; |
| 457 | if (!runtime) { |
| 458 | snd_iprintf(buffer, "closed\n"); |
| 459 | goto unlock; |
| 460 | } |
| 461 | memset(&status, 0, sizeof(status)); |
| 462 | err = snd_pcm_status(substream, &status); |
| 463 | if (err < 0) { |
| 464 | snd_iprintf(buffer, "error %d\n", err); |
| 465 | goto unlock; |
| 466 | } |
| 467 | snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); |
| 468 | snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); |
| 469 | snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", |
| 470 | status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); |
| 471 | snd_iprintf(buffer, "tstamp : %ld.%09ld\n", |
| 472 | status.tstamp.tv_sec, status.tstamp.tv_nsec); |
| 473 | snd_iprintf(buffer, "delay : %ld\n", status.delay); |
| 474 | snd_iprintf(buffer, "avail : %ld\n", status.avail); |
| 475 | snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); |
| 476 | snd_iprintf(buffer, "-----\n"); |
| 477 | snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); |
| 478 | snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); |
| 479 | unlock: |
| 480 | mutex_unlock(&substream->pcm->open_mutex); |
| 481 | } |
| 482 | |
| 483 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| 484 | static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry, |
| 485 | struct snd_info_buffer *buffer) |
| 486 | { |
| 487 | struct snd_pcm_substream *substream = entry->private_data; |
| 488 | struct snd_pcm_runtime *runtime; |
| 489 | |
| 490 | snd_pcm_stream_lock_irq(substream); |
| 491 | runtime = substream->runtime; |
| 492 | if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| 493 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| 494 | snd_pcm_stream_unlock_irq(substream); |
| 495 | } |
| 496 | |
| 497 | static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, |
| 498 | struct snd_info_buffer *buffer) |
| 499 | { |
| 500 | struct snd_pcm_str *pstr = entry->private_data; |
| 501 | snd_iprintf(buffer, "%d\n", pstr->xrun_debug); |
| 502 | } |
| 503 | |
| 504 | static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, |
| 505 | struct snd_info_buffer *buffer) |
| 506 | { |
| 507 | struct snd_pcm_str *pstr = entry->private_data; |
| 508 | char line[64]; |
| 509 | if (!snd_info_get_line(buffer, line, sizeof(line))) |
| 510 | pstr->xrun_debug = simple_strtoul(line, NULL, 10); |
| 511 | } |
| 512 | #endif |
| 513 | |
| 514 | static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) |
| 515 | { |
| 516 | struct snd_pcm *pcm = pstr->pcm; |
| 517 | struct snd_info_entry *entry; |
| 518 | char name[16]; |
| 519 | |
| 520 | sprintf(name, "pcm%i%c", pcm->device, |
| 521 | pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); |
| 522 | if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) |
| 523 | return -ENOMEM; |
| 524 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
| 525 | if (snd_info_register(entry) < 0) { |
| 526 | snd_info_free_entry(entry); |
| 527 | return -ENOMEM; |
| 528 | } |
| 529 | pstr->proc_root = entry; |
| 530 | |
| 531 | if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { |
| 532 | snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); |
| 533 | if (snd_info_register(entry) < 0) { |
| 534 | snd_info_free_entry(entry); |
| 535 | entry = NULL; |
| 536 | } |
| 537 | } |
| 538 | pstr->proc_info_entry = entry; |
| 539 | |
| 540 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| 541 | if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", |
| 542 | pstr->proc_root)) != NULL) { |
| 543 | entry->c.text.read = snd_pcm_xrun_debug_read; |
| 544 | entry->c.text.write = snd_pcm_xrun_debug_write; |
| 545 | entry->mode |= S_IWUSR; |
| 546 | entry->private_data = pstr; |
| 547 | if (snd_info_register(entry) < 0) { |
| 548 | snd_info_free_entry(entry); |
| 549 | entry = NULL; |
| 550 | } |
| 551 | } |
| 552 | pstr->proc_xrun_debug_entry = entry; |
| 553 | #endif |
| 554 | return 0; |
| 555 | } |
| 556 | |
| 557 | static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) |
| 558 | { |
| 559 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| 560 | snd_info_free_entry(pstr->proc_xrun_debug_entry); |
| 561 | pstr->proc_xrun_debug_entry = NULL; |
| 562 | #endif |
| 563 | snd_info_free_entry(pstr->proc_info_entry); |
| 564 | pstr->proc_info_entry = NULL; |
| 565 | snd_info_free_entry(pstr->proc_root); |
| 566 | pstr->proc_root = NULL; |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) |
| 571 | { |
| 572 | struct snd_info_entry *entry; |
| 573 | struct snd_card *card; |
| 574 | char name[16]; |
| 575 | |
| 576 | card = substream->pcm->card; |
| 577 | |
| 578 | sprintf(name, "sub%i", substream->number); |
| 579 | if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) |
| 580 | return -ENOMEM; |
| 581 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
| 582 | if (snd_info_register(entry) < 0) { |
| 583 | snd_info_free_entry(entry); |
| 584 | return -ENOMEM; |
| 585 | } |
| 586 | substream->proc_root = entry; |
| 587 | |
| 588 | if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { |
| 589 | snd_info_set_text_ops(entry, substream, |
| 590 | snd_pcm_substream_proc_info_read); |
| 591 | if (snd_info_register(entry) < 0) { |
| 592 | snd_info_free_entry(entry); |
| 593 | entry = NULL; |
| 594 | } |
| 595 | } |
| 596 | substream->proc_info_entry = entry; |
| 597 | |
| 598 | if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { |
| 599 | snd_info_set_text_ops(entry, substream, |
| 600 | snd_pcm_substream_proc_hw_params_read); |
| 601 | if (snd_info_register(entry) < 0) { |
| 602 | snd_info_free_entry(entry); |
| 603 | entry = NULL; |
| 604 | } |
| 605 | } |
| 606 | substream->proc_hw_params_entry = entry; |
| 607 | |
| 608 | if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { |
| 609 | snd_info_set_text_ops(entry, substream, |
| 610 | snd_pcm_substream_proc_sw_params_read); |
| 611 | if (snd_info_register(entry) < 0) { |
| 612 | snd_info_free_entry(entry); |
| 613 | entry = NULL; |
| 614 | } |
| 615 | } |
| 616 | substream->proc_sw_params_entry = entry; |
| 617 | |
| 618 | if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { |
| 619 | snd_info_set_text_ops(entry, substream, |
| 620 | snd_pcm_substream_proc_status_read); |
| 621 | if (snd_info_register(entry) < 0) { |
| 622 | snd_info_free_entry(entry); |
| 623 | entry = NULL; |
| 624 | } |
| 625 | } |
| 626 | substream->proc_status_entry = entry; |
| 627 | |
| 628 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| 629 | entry = snd_info_create_card_entry(card, "xrun_injection", |
| 630 | substream->proc_root); |
| 631 | if (entry) { |
| 632 | entry->private_data = substream; |
| 633 | entry->c.text.read = NULL; |
| 634 | entry->c.text.write = snd_pcm_xrun_injection_write; |
| 635 | entry->mode = S_IFREG | S_IWUSR; |
| 636 | if (snd_info_register(entry) < 0) { |
| 637 | snd_info_free_entry(entry); |
| 638 | entry = NULL; |
| 639 | } |
| 640 | } |
| 641 | substream->proc_xrun_injection_entry = entry; |
| 642 | #endif /* CONFIG_SND_PCM_XRUN_DEBUG */ |
| 643 | |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) |
| 648 | { |
| 649 | snd_info_free_entry(substream->proc_info_entry); |
| 650 | substream->proc_info_entry = NULL; |
| 651 | snd_info_free_entry(substream->proc_hw_params_entry); |
| 652 | substream->proc_hw_params_entry = NULL; |
| 653 | snd_info_free_entry(substream->proc_sw_params_entry); |
| 654 | substream->proc_sw_params_entry = NULL; |
| 655 | snd_info_free_entry(substream->proc_status_entry); |
| 656 | substream->proc_status_entry = NULL; |
| 657 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| 658 | snd_info_free_entry(substream->proc_xrun_injection_entry); |
| 659 | substream->proc_xrun_injection_entry = NULL; |
| 660 | #endif |
| 661 | snd_info_free_entry(substream->proc_root); |
| 662 | substream->proc_root = NULL; |
| 663 | return 0; |
| 664 | } |
| 665 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
| 666 | static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } |
| 667 | static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } |
| 668 | static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } |
| 669 | static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } |
| 670 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
| 671 | |
| 672 | static const struct attribute_group *pcm_dev_attr_groups[]; |
| 673 | |
| 674 | /** |
| 675 | * snd_pcm_new_stream - create a new PCM stream |
| 676 | * @pcm: the pcm instance |
| 677 | * @stream: the stream direction, SNDRV_PCM_STREAM_XXX |
| 678 | * @substream_count: the number of substreams |
| 679 | * |
| 680 | * Creates a new stream for the pcm. |
| 681 | * The corresponding stream on the pcm must have been empty before |
| 682 | * calling this, i.e. zero must be given to the argument of |
| 683 | * snd_pcm_new(). |
| 684 | * |
| 685 | * Return: Zero if successful, or a negative error code on failure. |
| 686 | */ |
| 687 | int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) |
| 688 | { |
| 689 | int idx, err; |
| 690 | struct snd_pcm_str *pstr = &pcm->streams[stream]; |
| 691 | struct snd_pcm_substream *substream, *prev; |
| 692 | |
| 693 | #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| 694 | mutex_init(&pstr->oss.setup_mutex); |
| 695 | #endif |
| 696 | pstr->stream = stream; |
| 697 | pstr->pcm = pcm; |
| 698 | pstr->substream_count = substream_count; |
| 699 | if (!substream_count) |
| 700 | return 0; |
| 701 | |
| 702 | snd_device_initialize(&pstr->dev, pcm->card); |
| 703 | pstr->dev.groups = pcm_dev_attr_groups; |
| 704 | dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device, |
| 705 | stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); |
| 706 | |
| 707 | if (!pcm->internal) { |
| 708 | err = snd_pcm_stream_proc_init(pstr); |
| 709 | if (err < 0) { |
| 710 | pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n"); |
| 711 | return err; |
| 712 | } |
| 713 | } |
| 714 | prev = NULL; |
| 715 | for (idx = 0, prev = NULL; idx < substream_count; idx++) { |
| 716 | substream = kzalloc(sizeof(*substream), GFP_KERNEL); |
| 717 | if (!substream) |
| 718 | return -ENOMEM; |
| 719 | substream->pcm = pcm; |
| 720 | substream->pstr = pstr; |
| 721 | substream->number = idx; |
| 722 | substream->stream = stream; |
| 723 | sprintf(substream->name, "subdevice #%i", idx); |
| 724 | substream->buffer_bytes_max = UINT_MAX; |
| 725 | if (prev == NULL) |
| 726 | pstr->substream = substream; |
| 727 | else |
| 728 | prev->next = substream; |
| 729 | |
| 730 | if (!pcm->internal) { |
| 731 | err = snd_pcm_substream_proc_init(substream); |
| 732 | if (err < 0) { |
| 733 | pcm_err(pcm, |
| 734 | "Error in snd_pcm_stream_proc_init\n"); |
| 735 | if (prev == NULL) |
| 736 | pstr->substream = NULL; |
| 737 | else |
| 738 | prev->next = NULL; |
| 739 | kfree(substream); |
| 740 | return err; |
| 741 | } |
| 742 | } |
| 743 | substream->group = &substream->self_group; |
| 744 | spin_lock_init(&substream->self_group.lock); |
| 745 | mutex_init(&substream->self_group.mutex); |
| 746 | INIT_LIST_HEAD(&substream->self_group.substreams); |
| 747 | list_add_tail(&substream->link_list, &substream->self_group.substreams); |
| 748 | atomic_set(&substream->mmap_count, 0); |
| 749 | prev = substream; |
| 750 | } |
| 751 | return 0; |
| 752 | } |
| 753 | EXPORT_SYMBOL(snd_pcm_new_stream); |
| 754 | |
| 755 | static int _snd_pcm_new(struct snd_card *card, const char *id, int device, |
| 756 | int playback_count, int capture_count, bool internal, |
| 757 | struct snd_pcm **rpcm) |
| 758 | { |
| 759 | struct snd_pcm *pcm; |
| 760 | int err; |
| 761 | static struct snd_device_ops ops = { |
| 762 | .dev_free = snd_pcm_dev_free, |
| 763 | .dev_register = snd_pcm_dev_register, |
| 764 | .dev_disconnect = snd_pcm_dev_disconnect, |
| 765 | }; |
| 766 | |
| 767 | if (snd_BUG_ON(!card)) |
| 768 | return -ENXIO; |
| 769 | if (rpcm) |
| 770 | *rpcm = NULL; |
| 771 | pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
| 772 | if (!pcm) |
| 773 | return -ENOMEM; |
| 774 | pcm->card = card; |
| 775 | pcm->device = device; |
| 776 | pcm->internal = internal; |
| 777 | mutex_init(&pcm->open_mutex); |
| 778 | init_waitqueue_head(&pcm->open_wait); |
| 779 | INIT_LIST_HEAD(&pcm->list); |
| 780 | if (id) |
| 781 | strlcpy(pcm->id, id, sizeof(pcm->id)); |
| 782 | if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { |
| 783 | snd_pcm_free(pcm); |
| 784 | return err; |
| 785 | } |
| 786 | if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { |
| 787 | snd_pcm_free(pcm); |
| 788 | return err; |
| 789 | } |
| 790 | if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { |
| 791 | snd_pcm_free(pcm); |
| 792 | return err; |
| 793 | } |
| 794 | if (rpcm) |
| 795 | *rpcm = pcm; |
| 796 | return 0; |
| 797 | } |
| 798 | |
| 799 | /** |
| 800 | * snd_pcm_new - create a new PCM instance |
| 801 | * @card: the card instance |
| 802 | * @id: the id string |
| 803 | * @device: the device index (zero based) |
| 804 | * @playback_count: the number of substreams for playback |
| 805 | * @capture_count: the number of substreams for capture |
| 806 | * @rpcm: the pointer to store the new pcm instance |
| 807 | * |
| 808 | * Creates a new PCM instance. |
| 809 | * |
| 810 | * The pcm operators have to be set afterwards to the new instance |
| 811 | * via snd_pcm_set_ops(). |
| 812 | * |
| 813 | * Return: Zero if successful, or a negative error code on failure. |
| 814 | */ |
| 815 | int snd_pcm_new(struct snd_card *card, const char *id, int device, |
| 816 | int playback_count, int capture_count, struct snd_pcm **rpcm) |
| 817 | { |
| 818 | return _snd_pcm_new(card, id, device, playback_count, capture_count, |
| 819 | false, rpcm); |
| 820 | } |
| 821 | EXPORT_SYMBOL(snd_pcm_new); |
| 822 | |
| 823 | /** |
| 824 | * snd_pcm_new_internal - create a new internal PCM instance |
| 825 | * @card: the card instance |
| 826 | * @id: the id string |
| 827 | * @device: the device index (zero based - shared with normal PCMs) |
| 828 | * @playback_count: the number of substreams for playback |
| 829 | * @capture_count: the number of substreams for capture |
| 830 | * @rpcm: the pointer to store the new pcm instance |
| 831 | * |
| 832 | * Creates a new internal PCM instance with no userspace device or procfs |
| 833 | * entries. This is used by ASoC Back End PCMs in order to create a PCM that |
| 834 | * will only be used internally by kernel drivers. i.e. it cannot be opened |
| 835 | * by userspace. It provides existing ASoC components drivers with a substream |
| 836 | * and access to any private data. |
| 837 | * |
| 838 | * The pcm operators have to be set afterwards to the new instance |
| 839 | * via snd_pcm_set_ops(). |
| 840 | * |
| 841 | * Return: Zero if successful, or a negative error code on failure. |
| 842 | */ |
| 843 | int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, |
| 844 | int playback_count, int capture_count, |
| 845 | struct snd_pcm **rpcm) |
| 846 | { |
| 847 | return _snd_pcm_new(card, id, device, playback_count, capture_count, |
| 848 | true, rpcm); |
| 849 | } |
| 850 | EXPORT_SYMBOL(snd_pcm_new_internal); |
| 851 | |
| 852 | static void snd_pcm_free_stream(struct snd_pcm_str * pstr) |
| 853 | { |
| 854 | struct snd_pcm_substream *substream, *substream_next; |
| 855 | #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| 856 | struct snd_pcm_oss_setup *setup, *setupn; |
| 857 | #endif |
| 858 | substream = pstr->substream; |
| 859 | while (substream) { |
| 860 | substream_next = substream->next; |
| 861 | snd_pcm_timer_done(substream); |
| 862 | snd_pcm_substream_proc_done(substream); |
| 863 | kfree(substream); |
| 864 | substream = substream_next; |
| 865 | } |
| 866 | snd_pcm_stream_proc_done(pstr); |
| 867 | #if IS_ENABLED(CONFIG_SND_PCM_OSS) |
| 868 | for (setup = pstr->oss.setup_list; setup; setup = setupn) { |
| 869 | setupn = setup->next; |
| 870 | kfree(setup->task_name); |
| 871 | kfree(setup); |
| 872 | } |
| 873 | #endif |
| 874 | if (pstr->substream_count) |
| 875 | put_device(&pstr->dev); |
| 876 | } |
| 877 | |
| 878 | static int snd_pcm_free(struct snd_pcm *pcm) |
| 879 | { |
| 880 | struct snd_pcm_notify *notify; |
| 881 | |
| 882 | if (!pcm) |
| 883 | return 0; |
| 884 | if (!pcm->internal) { |
| 885 | list_for_each_entry(notify, &snd_pcm_notify_list, list) |
| 886 | notify->n_unregister(pcm); |
| 887 | } |
| 888 | if (pcm->private_free) |
| 889 | pcm->private_free(pcm); |
| 890 | snd_pcm_lib_preallocate_free_for_all(pcm); |
| 891 | snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); |
| 892 | snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); |
| 893 | kfree(pcm); |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | static int snd_pcm_dev_free(struct snd_device *device) |
| 898 | { |
| 899 | struct snd_pcm *pcm = device->device_data; |
| 900 | return snd_pcm_free(pcm); |
| 901 | } |
| 902 | |
| 903 | int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, |
| 904 | struct file *file, |
| 905 | struct snd_pcm_substream **rsubstream) |
| 906 | { |
| 907 | struct snd_pcm_str * pstr; |
| 908 | struct snd_pcm_substream *substream; |
| 909 | struct snd_pcm_runtime *runtime; |
| 910 | struct snd_card *card; |
| 911 | int prefer_subdevice; |
| 912 | size_t size; |
| 913 | |
| 914 | if (snd_BUG_ON(!pcm || !rsubstream)) |
| 915 | return -ENXIO; |
| 916 | if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK && |
| 917 | stream != SNDRV_PCM_STREAM_CAPTURE)) |
| 918 | return -EINVAL; |
| 919 | *rsubstream = NULL; |
| 920 | pstr = &pcm->streams[stream]; |
| 921 | if (pstr->substream == NULL || pstr->substream_count == 0) |
| 922 | return -ENODEV; |
| 923 | |
| 924 | card = pcm->card; |
| 925 | prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM); |
| 926 | |
| 927 | if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
| 928 | int opposite = !stream; |
| 929 | |
| 930 | for (substream = pcm->streams[opposite].substream; substream; |
| 931 | substream = substream->next) { |
| 932 | if (SUBSTREAM_BUSY(substream)) |
| 933 | return -EAGAIN; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | if (file->f_flags & O_APPEND) { |
| 938 | if (prefer_subdevice < 0) { |
| 939 | if (pstr->substream_count > 1) |
| 940 | return -EINVAL; /* must be unique */ |
| 941 | substream = pstr->substream; |
| 942 | } else { |
| 943 | for (substream = pstr->substream; substream; |
| 944 | substream = substream->next) |
| 945 | if (substream->number == prefer_subdevice) |
| 946 | break; |
| 947 | } |
| 948 | if (! substream) |
| 949 | return -ENODEV; |
| 950 | if (! SUBSTREAM_BUSY(substream)) |
| 951 | return -EBADFD; |
| 952 | substream->ref_count++; |
| 953 | *rsubstream = substream; |
| 954 | return 0; |
| 955 | } |
| 956 | |
| 957 | for (substream = pstr->substream; substream; substream = substream->next) { |
| 958 | if (!SUBSTREAM_BUSY(substream) && |
| 959 | (prefer_subdevice == -1 || |
| 960 | substream->number == prefer_subdevice)) |
| 961 | break; |
| 962 | } |
| 963 | if (substream == NULL) |
| 964 | return -EAGAIN; |
| 965 | |
| 966 | runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); |
| 967 | if (runtime == NULL) |
| 968 | return -ENOMEM; |
| 969 | |
| 970 | size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); |
| 971 | runtime->status = snd_malloc_pages(size, GFP_KERNEL); |
| 972 | if (runtime->status == NULL) { |
| 973 | kfree(runtime); |
| 974 | return -ENOMEM; |
| 975 | } |
| 976 | memset((void*)runtime->status, 0, size); |
| 977 | |
| 978 | size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); |
| 979 | runtime->control = snd_malloc_pages(size, GFP_KERNEL); |
| 980 | if (runtime->control == NULL) { |
| 981 | snd_free_pages((void*)runtime->status, |
| 982 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); |
| 983 | kfree(runtime); |
| 984 | return -ENOMEM; |
| 985 | } |
| 986 | memset((void*)runtime->control, 0, size); |
| 987 | |
| 988 | init_waitqueue_head(&runtime->sleep); |
| 989 | init_waitqueue_head(&runtime->tsleep); |
| 990 | |
| 991 | runtime->status->state = SNDRV_PCM_STATE_OPEN; |
| 992 | |
| 993 | substream->runtime = runtime; |
| 994 | substream->private_data = pcm->private_data; |
| 995 | substream->ref_count = 1; |
| 996 | substream->f_flags = file->f_flags; |
| 997 | substream->pid = get_pid(task_pid(current)); |
| 998 | pstr->substream_opened++; |
| 999 | *rsubstream = substream; |
| 1000 | return 0; |
| 1001 | } |
| 1002 | |
| 1003 | void snd_pcm_detach_substream(struct snd_pcm_substream *substream) |
| 1004 | { |
| 1005 | struct snd_pcm_runtime *runtime; |
| 1006 | |
| 1007 | if (PCM_RUNTIME_CHECK(substream)) |
| 1008 | return; |
| 1009 | runtime = substream->runtime; |
| 1010 | if (runtime->private_free != NULL) |
| 1011 | runtime->private_free(runtime); |
| 1012 | snd_free_pages((void*)runtime->status, |
| 1013 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); |
| 1014 | snd_free_pages((void*)runtime->control, |
| 1015 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); |
| 1016 | kfree(runtime->hw_constraints.rules); |
| 1017 | kfree(runtime); |
| 1018 | substream->runtime = NULL; |
| 1019 | put_pid(substream->pid); |
| 1020 | substream->pid = NULL; |
| 1021 | substream->pstr->substream_opened--; |
| 1022 | } |
| 1023 | |
| 1024 | static ssize_t show_pcm_class(struct device *dev, |
| 1025 | struct device_attribute *attr, char *buf) |
| 1026 | { |
| 1027 | struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev); |
| 1028 | struct snd_pcm *pcm = pstr->pcm; |
| 1029 | const char *str; |
| 1030 | static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { |
| 1031 | [SNDRV_PCM_CLASS_GENERIC] = "generic", |
| 1032 | [SNDRV_PCM_CLASS_MULTI] = "multi", |
| 1033 | [SNDRV_PCM_CLASS_MODEM] = "modem", |
| 1034 | [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", |
| 1035 | }; |
| 1036 | |
| 1037 | if (pcm->dev_class > SNDRV_PCM_CLASS_LAST) |
| 1038 | str = "none"; |
| 1039 | else |
| 1040 | str = strs[pcm->dev_class]; |
| 1041 | return snprintf(buf, PAGE_SIZE, "%s\n", str); |
| 1042 | } |
| 1043 | |
| 1044 | static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); |
| 1045 | static struct attribute *pcm_dev_attrs[] = { |
| 1046 | &dev_attr_pcm_class.attr, |
| 1047 | NULL |
| 1048 | }; |
| 1049 | |
| 1050 | static struct attribute_group pcm_dev_attr_group = { |
| 1051 | .attrs = pcm_dev_attrs, |
| 1052 | }; |
| 1053 | |
| 1054 | static const struct attribute_group *pcm_dev_attr_groups[] = { |
| 1055 | &pcm_dev_attr_group, |
| 1056 | NULL |
| 1057 | }; |
| 1058 | |
| 1059 | static int snd_pcm_dev_register(struct snd_device *device) |
| 1060 | { |
| 1061 | int cidx, err; |
| 1062 | struct snd_pcm_substream *substream; |
| 1063 | struct snd_pcm_notify *notify; |
| 1064 | struct snd_pcm *pcm; |
| 1065 | |
| 1066 | if (snd_BUG_ON(!device || !device->device_data)) |
| 1067 | return -ENXIO; |
| 1068 | pcm = device->device_data; |
| 1069 | if (pcm->internal) |
| 1070 | return 0; |
| 1071 | |
| 1072 | mutex_lock(®ister_mutex); |
| 1073 | err = snd_pcm_add(pcm); |
| 1074 | if (err) |
| 1075 | goto unlock; |
| 1076 | for (cidx = 0; cidx < 2; cidx++) { |
| 1077 | int devtype = -1; |
| 1078 | if (pcm->streams[cidx].substream == NULL) |
| 1079 | continue; |
| 1080 | switch (cidx) { |
| 1081 | case SNDRV_PCM_STREAM_PLAYBACK: |
| 1082 | devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; |
| 1083 | break; |
| 1084 | case SNDRV_PCM_STREAM_CAPTURE: |
| 1085 | devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; |
| 1086 | break; |
| 1087 | } |
| 1088 | /* register pcm */ |
| 1089 | err = snd_register_device(devtype, pcm->card, pcm->device, |
| 1090 | &snd_pcm_f_ops[cidx], pcm, |
| 1091 | &pcm->streams[cidx].dev); |
| 1092 | if (err < 0) { |
| 1093 | list_del_init(&pcm->list); |
| 1094 | goto unlock; |
| 1095 | } |
| 1096 | |
| 1097 | for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) |
| 1098 | snd_pcm_timer_init(substream); |
| 1099 | } |
| 1100 | |
| 1101 | list_for_each_entry(notify, &snd_pcm_notify_list, list) |
| 1102 | notify->n_register(pcm); |
| 1103 | |
| 1104 | unlock: |
| 1105 | mutex_unlock(®ister_mutex); |
| 1106 | return err; |
| 1107 | } |
| 1108 | |
| 1109 | static int snd_pcm_dev_disconnect(struct snd_device *device) |
| 1110 | { |
| 1111 | struct snd_pcm *pcm = device->device_data; |
| 1112 | struct snd_pcm_notify *notify; |
| 1113 | struct snd_pcm_substream *substream; |
| 1114 | int cidx; |
| 1115 | |
| 1116 | mutex_lock(®ister_mutex); |
| 1117 | mutex_lock(&pcm->open_mutex); |
| 1118 | wake_up(&pcm->open_wait); |
| 1119 | list_del_init(&pcm->list); |
| 1120 | for (cidx = 0; cidx < 2; cidx++) { |
| 1121 | for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { |
| 1122 | snd_pcm_stream_lock_irq(substream); |
| 1123 | if (substream->runtime) { |
| 1124 | substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; |
| 1125 | wake_up(&substream->runtime->sleep); |
| 1126 | wake_up(&substream->runtime->tsleep); |
| 1127 | } |
| 1128 | snd_pcm_stream_unlock_irq(substream); |
| 1129 | } |
| 1130 | } |
| 1131 | if (!pcm->internal) { |
| 1132 | list_for_each_entry(notify, &snd_pcm_notify_list, list) |
| 1133 | notify->n_disconnect(pcm); |
| 1134 | } |
| 1135 | for (cidx = 0; cidx < 2; cidx++) { |
| 1136 | if (!pcm->internal) |
| 1137 | snd_unregister_device(&pcm->streams[cidx].dev); |
| 1138 | if (pcm->streams[cidx].chmap_kctl) { |
| 1139 | snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl); |
| 1140 | pcm->streams[cidx].chmap_kctl = NULL; |
| 1141 | } |
| 1142 | } |
| 1143 | mutex_unlock(&pcm->open_mutex); |
| 1144 | mutex_unlock(®ister_mutex); |
| 1145 | return 0; |
| 1146 | } |
| 1147 | |
| 1148 | /** |
| 1149 | * snd_pcm_notify - Add/remove the notify list |
| 1150 | * @notify: PCM notify list |
| 1151 | * @nfree: 0 = register, 1 = unregister |
| 1152 | * |
| 1153 | * This adds the given notifier to the global list so that the callback is |
| 1154 | * called for each registered PCM devices. This exists only for PCM OSS |
| 1155 | * emulation, so far. |
| 1156 | */ |
| 1157 | int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) |
| 1158 | { |
| 1159 | struct snd_pcm *pcm; |
| 1160 | |
| 1161 | if (snd_BUG_ON(!notify || |
| 1162 | !notify->n_register || |
| 1163 | !notify->n_unregister || |
| 1164 | !notify->n_disconnect)) |
| 1165 | return -EINVAL; |
| 1166 | mutex_lock(®ister_mutex); |
| 1167 | if (nfree) { |
| 1168 | list_del(¬ify->list); |
| 1169 | list_for_each_entry(pcm, &snd_pcm_devices, list) |
| 1170 | notify->n_unregister(pcm); |
| 1171 | } else { |
| 1172 | list_add_tail(¬ify->list, &snd_pcm_notify_list); |
| 1173 | list_for_each_entry(pcm, &snd_pcm_devices, list) |
| 1174 | notify->n_register(pcm); |
| 1175 | } |
| 1176 | mutex_unlock(®ister_mutex); |
| 1177 | return 0; |
| 1178 | } |
| 1179 | EXPORT_SYMBOL(snd_pcm_notify); |
| 1180 | |
| 1181 | #ifdef CONFIG_SND_PROC_FS |
| 1182 | /* |
| 1183 | * Info interface |
| 1184 | */ |
| 1185 | |
| 1186 | static void snd_pcm_proc_read(struct snd_info_entry *entry, |
| 1187 | struct snd_info_buffer *buffer) |
| 1188 | { |
| 1189 | struct snd_pcm *pcm; |
| 1190 | |
| 1191 | mutex_lock(®ister_mutex); |
| 1192 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
| 1193 | snd_iprintf(buffer, "%02i-%02i: %s : %s", |
| 1194 | pcm->card->number, pcm->device, pcm->id, pcm->name); |
| 1195 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) |
| 1196 | snd_iprintf(buffer, " : playback %i", |
| 1197 | pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); |
| 1198 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) |
| 1199 | snd_iprintf(buffer, " : capture %i", |
| 1200 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); |
| 1201 | snd_iprintf(buffer, "\n"); |
| 1202 | } |
| 1203 | mutex_unlock(®ister_mutex); |
| 1204 | } |
| 1205 | |
| 1206 | static struct snd_info_entry *snd_pcm_proc_entry; |
| 1207 | |
| 1208 | static void snd_pcm_proc_init(void) |
| 1209 | { |
| 1210 | struct snd_info_entry *entry; |
| 1211 | |
| 1212 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { |
| 1213 | snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); |
| 1214 | if (snd_info_register(entry) < 0) { |
| 1215 | snd_info_free_entry(entry); |
| 1216 | entry = NULL; |
| 1217 | } |
| 1218 | } |
| 1219 | snd_pcm_proc_entry = entry; |
| 1220 | } |
| 1221 | |
| 1222 | static void snd_pcm_proc_done(void) |
| 1223 | { |
| 1224 | snd_info_free_entry(snd_pcm_proc_entry); |
| 1225 | } |
| 1226 | |
| 1227 | #else /* !CONFIG_SND_PROC_FS */ |
| 1228 | #define snd_pcm_proc_init() |
| 1229 | #define snd_pcm_proc_done() |
| 1230 | #endif /* CONFIG_SND_PROC_FS */ |
| 1231 | |
| 1232 | |
| 1233 | /* |
| 1234 | * ENTRY functions |
| 1235 | */ |
| 1236 | |
| 1237 | static int __init alsa_pcm_init(void) |
| 1238 | { |
| 1239 | snd_ctl_register_ioctl(snd_pcm_control_ioctl); |
| 1240 | snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); |
| 1241 | snd_pcm_proc_init(); |
| 1242 | return 0; |
| 1243 | } |
| 1244 | |
| 1245 | static void __exit alsa_pcm_exit(void) |
| 1246 | { |
| 1247 | snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); |
| 1248 | snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); |
| 1249 | snd_pcm_proc_done(); |
| 1250 | } |
| 1251 | |
| 1252 | module_init(alsa_pcm_init) |
| 1253 | module_exit(alsa_pcm_exit) |