1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <sound/core.h> 27 #include <sound/minors.h> 28 #include <sound/pcm.h> 29 #include <sound/control.h> 30 #include <sound/info.h> 31 32 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 34 MODULE_LICENSE("GPL"); 35 36 snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES]; 37 static LIST_HEAD(snd_pcm_notify_list); 38 static DECLARE_MUTEX(register_mutex); 39 40 static int snd_pcm_free(snd_pcm_t *pcm); 41 static int snd_pcm_dev_free(snd_device_t *device); 42 static int snd_pcm_dev_register(snd_device_t *device); 43 static int snd_pcm_dev_disconnect(snd_device_t *device); 44 static int snd_pcm_dev_unregister(snd_device_t *device); 45 46 static int snd_pcm_control_ioctl(snd_card_t * card, 47 snd_ctl_file_t * control, 48 unsigned int cmd, unsigned long arg) 49 { 50 unsigned int tmp; 51 52 tmp = card->number * SNDRV_PCM_DEVICES; 53 switch (cmd) { 54 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 55 { 56 int device; 57 58 if (get_user(device, (int __user *)arg)) 59 return -EFAULT; 60 device = device < 0 ? 0 : device + 1; 61 while (device < SNDRV_PCM_DEVICES) { 62 if (snd_pcm_devices[tmp + device]) 63 break; 64 device++; 65 } 66 if (device == SNDRV_PCM_DEVICES) 67 device = -1; 68 if (put_user(device, (int __user *)arg)) 69 return -EFAULT; 70 return 0; 71 } 72 case SNDRV_CTL_IOCTL_PCM_INFO: 73 { 74 snd_pcm_info_t __user *info; 75 unsigned int device, subdevice; 76 snd_pcm_stream_t stream; 77 snd_pcm_t *pcm; 78 snd_pcm_str_t *pstr; 79 snd_pcm_substream_t *substream; 80 info = (snd_pcm_info_t __user *)arg; 81 if (get_user(device, &info->device)) 82 return -EFAULT; 83 if (device >= SNDRV_PCM_DEVICES) 84 return -ENXIO; 85 pcm = snd_pcm_devices[tmp + device]; 86 if (pcm == NULL) 87 return -ENXIO; 88 if (get_user(stream, &info->stream)) 89 return -EFAULT; 90 if (stream < 0 || stream > 1) 91 return -EINVAL; 92 pstr = &pcm->streams[stream]; 93 if (pstr->substream_count == 0) 94 return -ENOENT; 95 if (get_user(subdevice, &info->subdevice)) 96 return -EFAULT; 97 if (subdevice >= pstr->substream_count) 98 return -ENXIO; 99 for (substream = pstr->substream; substream; substream = substream->next) 100 if (substream->number == (int)subdevice) 101 break; 102 if (substream == NULL) 103 return -ENXIO; 104 return snd_pcm_info_user(substream, info); 105 } 106 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 107 { 108 int val; 109 110 if (get_user(val, (int __user *)arg)) 111 return -EFAULT; 112 control->prefer_pcm_subdevice = val; 113 return 0; 114 } 115 } 116 return -ENOIOCTLCMD; 117 } 118 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v 119 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 120 #define READY(v) [SNDRV_PCM_READY_##v] = #v 121 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 122 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 123 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 124 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 125 #define START(v) [SNDRV_PCM_START_##v] = #v 126 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 127 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 128 129 static char *snd_pcm_stream_names[] = { 130 STREAM(PLAYBACK), 131 STREAM(CAPTURE), 132 }; 133 134 static char *snd_pcm_state_names[] = { 135 STATE(OPEN), 136 STATE(SETUP), 137 STATE(PREPARED), 138 STATE(RUNNING), 139 STATE(XRUN), 140 STATE(DRAINING), 141 STATE(PAUSED), 142 STATE(SUSPENDED), 143 }; 144 145 static char *snd_pcm_access_names[] = { 146 ACCESS(MMAP_INTERLEAVED), 147 ACCESS(MMAP_NONINTERLEAVED), 148 ACCESS(MMAP_COMPLEX), 149 ACCESS(RW_INTERLEAVED), 150 ACCESS(RW_NONINTERLEAVED), 151 }; 152 153 static char *snd_pcm_format_names[] = { 154 FORMAT(S8), 155 FORMAT(U8), 156 FORMAT(S16_LE), 157 FORMAT(S16_BE), 158 FORMAT(U16_LE), 159 FORMAT(U16_BE), 160 FORMAT(S24_LE), 161 FORMAT(S24_BE), 162 FORMAT(U24_LE), 163 FORMAT(U24_BE), 164 FORMAT(S32_LE), 165 FORMAT(S32_BE), 166 FORMAT(U32_LE), 167 FORMAT(U32_BE), 168 FORMAT(FLOAT_LE), 169 FORMAT(FLOAT_BE), 170 FORMAT(FLOAT64_LE), 171 FORMAT(FLOAT64_BE), 172 FORMAT(IEC958_SUBFRAME_LE), 173 FORMAT(IEC958_SUBFRAME_BE), 174 FORMAT(MU_LAW), 175 FORMAT(A_LAW), 176 FORMAT(IMA_ADPCM), 177 FORMAT(MPEG), 178 FORMAT(GSM), 179 FORMAT(SPECIAL), 180 FORMAT(S24_3LE), 181 FORMAT(S24_3BE), 182 FORMAT(U24_3LE), 183 FORMAT(U24_3BE), 184 FORMAT(S20_3LE), 185 FORMAT(S20_3BE), 186 FORMAT(U20_3LE), 187 FORMAT(U20_3BE), 188 FORMAT(S18_3LE), 189 FORMAT(S18_3BE), 190 FORMAT(U18_3LE), 191 FORMAT(U18_3BE), 192 }; 193 194 static char *snd_pcm_subformat_names[] = { 195 SUBFORMAT(STD), 196 }; 197 198 static char *snd_pcm_tstamp_mode_names[] = { 199 TSTAMP(NONE), 200 TSTAMP(MMAP), 201 }; 202 203 static const char *snd_pcm_stream_name(snd_pcm_stream_t stream) 204 { 205 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL); 206 return snd_pcm_stream_names[stream]; 207 } 208 209 static const char *snd_pcm_access_name(snd_pcm_access_t access) 210 { 211 snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL); 212 return snd_pcm_access_names[access]; 213 } 214 215 const char *snd_pcm_format_name(snd_pcm_format_t format) 216 { 217 snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL); 218 return snd_pcm_format_names[format]; 219 } 220 221 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 222 { 223 snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL); 224 return snd_pcm_subformat_names[subformat]; 225 } 226 227 static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode) 228 { 229 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL); 230 return snd_pcm_tstamp_mode_names[mode]; 231 } 232 233 static const char *snd_pcm_state_name(snd_pcm_state_t state) 234 { 235 snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL); 236 return snd_pcm_state_names[state]; 237 } 238 239 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 240 #include <linux/soundcard.h> 241 static const char *snd_pcm_oss_format_name(int format) 242 { 243 switch (format) { 244 case AFMT_MU_LAW: 245 return "MU_LAW"; 246 case AFMT_A_LAW: 247 return "A_LAW"; 248 case AFMT_IMA_ADPCM: 249 return "IMA_ADPCM"; 250 case AFMT_U8: 251 return "U8"; 252 case AFMT_S16_LE: 253 return "S16_LE"; 254 case AFMT_S16_BE: 255 return "S16_BE"; 256 case AFMT_S8: 257 return "S8"; 258 case AFMT_U16_LE: 259 return "U16_LE"; 260 case AFMT_U16_BE: 261 return "U16_BE"; 262 case AFMT_MPEG: 263 return "MPEG"; 264 default: 265 return "unknown"; 266 } 267 } 268 #endif 269 270 #ifdef CONFIG_PROC_FS 271 static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer) 272 { 273 snd_pcm_info_t *info; 274 int err; 275 276 snd_runtime_check(substream, return); 277 278 info = kmalloc(sizeof(*info), GFP_KERNEL); 279 if (! info) { 280 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 281 return; 282 } 283 284 err = snd_pcm_info(substream, info); 285 if (err < 0) { 286 snd_iprintf(buffer, "error %d\n", err); 287 kfree(info); 288 return; 289 } 290 snd_iprintf(buffer, "card: %d\n", info->card); 291 snd_iprintf(buffer, "device: %d\n", info->device); 292 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 293 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 294 snd_iprintf(buffer, "id: %s\n", info->id); 295 snd_iprintf(buffer, "name: %s\n", info->name); 296 snd_iprintf(buffer, "subname: %s\n", info->subname); 297 snd_iprintf(buffer, "class: %d\n", info->dev_class); 298 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 299 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 300 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 301 kfree(info); 302 } 303 304 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 305 { 306 snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer); 307 } 308 309 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 310 { 311 snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer); 312 } 313 314 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 315 { 316 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 317 snd_pcm_runtime_t *runtime = substream->runtime; 318 if (!runtime) { 319 snd_iprintf(buffer, "closed\n"); 320 return; 321 } 322 snd_pcm_stream_lock_irq(substream); 323 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 324 snd_iprintf(buffer, "no setup\n"); 325 snd_pcm_stream_unlock_irq(substream); 326 return; 327 } 328 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 329 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 330 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 331 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 332 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 333 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 334 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 335 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time); 336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 337 if (substream->oss.oss) { 338 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 339 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 340 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 341 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 342 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 343 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 344 } 345 #endif 346 snd_pcm_stream_unlock_irq(substream); 347 } 348 349 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 350 { 351 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 352 snd_pcm_runtime_t *runtime = substream->runtime; 353 if (!runtime) { 354 snd_iprintf(buffer, "closed\n"); 355 return; 356 } 357 snd_pcm_stream_lock_irq(substream); 358 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 359 snd_iprintf(buffer, "no setup\n"); 360 snd_pcm_stream_unlock_irq(substream); 361 return; 362 } 363 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 364 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 365 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min); 366 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 367 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align); 368 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 369 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 370 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 371 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 372 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 373 snd_pcm_stream_unlock_irq(substream); 374 } 375 376 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 377 { 378 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 379 snd_pcm_runtime_t *runtime = substream->runtime; 380 snd_pcm_status_t status; 381 int err; 382 if (!runtime) { 383 snd_iprintf(buffer, "closed\n"); 384 return; 385 } 386 memset(&status, 0, sizeof(status)); 387 err = snd_pcm_status(substream, &status); 388 if (err < 0) { 389 snd_iprintf(buffer, "error %d\n", err); 390 return; 391 } 392 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 393 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 394 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 395 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 396 status.tstamp.tv_sec, status.tstamp.tv_nsec); 397 snd_iprintf(buffer, "delay : %ld\n", status.delay); 398 snd_iprintf(buffer, "avail : %ld\n", status.avail); 399 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 400 snd_iprintf(buffer, "-----\n"); 401 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 402 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 403 } 404 #endif 405 406 #ifdef CONFIG_SND_DEBUG 407 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 408 { 409 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data; 410 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 411 } 412 413 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 414 { 415 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data; 416 char line[64]; 417 if (!snd_info_get_line(buffer, line, sizeof(line))) 418 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 419 } 420 #endif 421 422 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr) 423 { 424 snd_pcm_t *pcm = pstr->pcm; 425 snd_info_entry_t *entry; 426 char name[16]; 427 428 sprintf(name, "pcm%i%c", pcm->device, 429 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 430 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 431 return -ENOMEM; 432 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 433 if (snd_info_register(entry) < 0) { 434 snd_info_free_entry(entry); 435 return -ENOMEM; 436 } 437 pstr->proc_root = entry; 438 439 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 440 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read); 441 if (snd_info_register(entry) < 0) { 442 snd_info_free_entry(entry); 443 entry = NULL; 444 } 445 } 446 pstr->proc_info_entry = entry; 447 448 #ifdef CONFIG_SND_DEBUG 449 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) { 450 entry->c.text.read_size = 64; 451 entry->c.text.read = snd_pcm_xrun_debug_read; 452 entry->c.text.write_size = 64; 453 entry->c.text.write = snd_pcm_xrun_debug_write; 454 entry->mode |= S_IWUSR; 455 entry->private_data = pstr; 456 if (snd_info_register(entry) < 0) { 457 snd_info_free_entry(entry); 458 entry = NULL; 459 } 460 } 461 pstr->proc_xrun_debug_entry = entry; 462 #endif 463 return 0; 464 } 465 466 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr) 467 { 468 #ifdef CONFIG_SND_DEBUG 469 if (pstr->proc_xrun_debug_entry) { 470 snd_info_unregister(pstr->proc_xrun_debug_entry); 471 pstr->proc_xrun_debug_entry = NULL; 472 } 473 #endif 474 if (pstr->proc_info_entry) { 475 snd_info_unregister(pstr->proc_info_entry); 476 pstr->proc_info_entry = NULL; 477 } 478 if (pstr->proc_root) { 479 snd_info_unregister(pstr->proc_root); 480 pstr->proc_root = NULL; 481 } 482 return 0; 483 } 484 485 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream) 486 { 487 snd_info_entry_t *entry; 488 snd_card_t *card; 489 char name[16]; 490 491 card = substream->pcm->card; 492 493 sprintf(name, "sub%i", substream->number); 494 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 495 return -ENOMEM; 496 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 497 if (snd_info_register(entry) < 0) { 498 snd_info_free_entry(entry); 499 return -ENOMEM; 500 } 501 substream->proc_root = entry; 502 503 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 504 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read); 505 if (snd_info_register(entry) < 0) { 506 snd_info_free_entry(entry); 507 entry = NULL; 508 } 509 } 510 substream->proc_info_entry = entry; 511 512 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 513 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read); 514 if (snd_info_register(entry) < 0) { 515 snd_info_free_entry(entry); 516 entry = NULL; 517 } 518 } 519 substream->proc_hw_params_entry = entry; 520 521 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 522 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read); 523 if (snd_info_register(entry) < 0) { 524 snd_info_free_entry(entry); 525 entry = NULL; 526 } 527 } 528 substream->proc_sw_params_entry = entry; 529 530 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 531 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read); 532 if (snd_info_register(entry) < 0) { 533 snd_info_free_entry(entry); 534 entry = NULL; 535 } 536 } 537 substream->proc_status_entry = entry; 538 539 return 0; 540 } 541 542 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream) 543 { 544 if (substream->proc_info_entry) { 545 snd_info_unregister(substream->proc_info_entry); 546 substream->proc_info_entry = NULL; 547 } 548 if (substream->proc_hw_params_entry) { 549 snd_info_unregister(substream->proc_hw_params_entry); 550 substream->proc_hw_params_entry = NULL; 551 } 552 if (substream->proc_sw_params_entry) { 553 snd_info_unregister(substream->proc_sw_params_entry); 554 substream->proc_sw_params_entry = NULL; 555 } 556 if (substream->proc_status_entry) { 557 snd_info_unregister(substream->proc_status_entry); 558 substream->proc_status_entry = NULL; 559 } 560 if (substream->proc_root) { 561 snd_info_unregister(substream->proc_root); 562 substream->proc_root = NULL; 563 } 564 return 0; 565 } 566 567 /** 568 * snd_pcm_new_stream - create a new PCM stream 569 * @pcm: the pcm instance 570 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 571 * @substream_count: the number of substreams 572 * 573 * Creates a new stream for the pcm. 574 * The corresponding stream on the pcm must have been empty before 575 * calling this, i.e. zero must be given to the argument of 576 * snd_pcm_new(). 577 * 578 * Returns zero if successful, or a negative error code on failure. 579 */ 580 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count) 581 { 582 int idx, err; 583 snd_pcm_str_t *pstr = &pcm->streams[stream]; 584 snd_pcm_substream_t *substream, *prev; 585 586 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 587 init_MUTEX(&pstr->oss.setup_mutex); 588 #endif 589 pstr->stream = stream; 590 pstr->pcm = pcm; 591 pstr->substream_count = substream_count; 592 pstr->reg = &snd_pcm_reg[stream]; 593 if (substream_count > 0) { 594 err = snd_pcm_stream_proc_init(pstr); 595 if (err < 0) 596 return err; 597 } 598 prev = NULL; 599 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 600 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 601 if (substream == NULL) 602 return -ENOMEM; 603 substream->pcm = pcm; 604 substream->pstr = pstr; 605 substream->number = idx; 606 substream->stream = stream; 607 sprintf(substream->name, "subdevice #%i", idx); 608 substream->buffer_bytes_max = UINT_MAX; 609 if (prev == NULL) 610 pstr->substream = substream; 611 else 612 prev->next = substream; 613 err = snd_pcm_substream_proc_init(substream); 614 if (err < 0) { 615 kfree(substream); 616 return err; 617 } 618 substream->group = &substream->self_group; 619 spin_lock_init(&substream->self_group.lock); 620 INIT_LIST_HEAD(&substream->self_group.substreams); 621 list_add_tail(&substream->link_list, &substream->self_group.substreams); 622 spin_lock_init(&substream->timer_lock); 623 prev = substream; 624 } 625 return 0; 626 } 627 628 /** 629 * snd_pcm_new - create a new PCM instance 630 * @card: the card instance 631 * @id: the id string 632 * @device: the device index (zero based) 633 * @playback_count: the number of substreams for playback 634 * @capture_count: the number of substreams for capture 635 * @rpcm: the pointer to store the new pcm instance 636 * 637 * Creates a new PCM instance. 638 * 639 * The pcm operators have to be set afterwards to the new instance 640 * via snd_pcm_set_ops(). 641 * 642 * Returns zero if successful, or a negative error code on failure. 643 */ 644 int snd_pcm_new(snd_card_t * card, char *id, int device, 645 int playback_count, int capture_count, 646 snd_pcm_t ** rpcm) 647 { 648 snd_pcm_t *pcm; 649 int err; 650 static snd_device_ops_t ops = { 651 .dev_free = snd_pcm_dev_free, 652 .dev_register = snd_pcm_dev_register, 653 .dev_disconnect = snd_pcm_dev_disconnect, 654 .dev_unregister = snd_pcm_dev_unregister 655 }; 656 657 snd_assert(rpcm != NULL, return -EINVAL); 658 *rpcm = NULL; 659 snd_assert(card != NULL, return -ENXIO); 660 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 661 if (pcm == NULL) 662 return -ENOMEM; 663 pcm->card = card; 664 pcm->device = device; 665 if (id) { 666 strlcpy(pcm->id, id, sizeof(pcm->id)); 667 } 668 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 669 snd_pcm_free(pcm); 670 return err; 671 } 672 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 673 snd_pcm_free(pcm); 674 return err; 675 } 676 init_MUTEX(&pcm->open_mutex); 677 init_waitqueue_head(&pcm->open_wait); 678 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 679 snd_pcm_free(pcm); 680 return err; 681 } 682 *rpcm = pcm; 683 return 0; 684 } 685 686 static void snd_pcm_free_stream(snd_pcm_str_t * pstr) 687 { 688 snd_pcm_substream_t *substream, *substream_next; 689 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 690 snd_pcm_oss_setup_t *setup, *setupn; 691 #endif 692 substream = pstr->substream; 693 while (substream) { 694 substream_next = substream->next; 695 snd_pcm_substream_proc_done(substream); 696 kfree(substream); 697 substream = substream_next; 698 } 699 snd_pcm_stream_proc_done(pstr); 700 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 701 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 702 setupn = setup->next; 703 kfree(setup->task_name); 704 kfree(setup); 705 } 706 #endif 707 } 708 709 static int snd_pcm_free(snd_pcm_t *pcm) 710 { 711 snd_assert(pcm != NULL, return -ENXIO); 712 if (pcm->private_free) 713 pcm->private_free(pcm); 714 snd_pcm_lib_preallocate_free_for_all(pcm); 715 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 716 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 717 kfree(pcm); 718 return 0; 719 } 720 721 static int snd_pcm_dev_free(snd_device_t *device) 722 { 723 snd_pcm_t *pcm = device->device_data; 724 return snd_pcm_free(pcm); 725 } 726 727 static void snd_pcm_tick_timer_func(unsigned long data) 728 { 729 snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data; 730 snd_pcm_tick_elapsed(substream); 731 } 732 733 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream, 734 snd_pcm_substream_t **rsubstream) 735 { 736 snd_pcm_str_t * pstr; 737 snd_pcm_substream_t * substream; 738 snd_pcm_runtime_t * runtime; 739 snd_ctl_file_t *kctl; 740 snd_card_t *card; 741 struct list_head *list; 742 int prefer_subdevice = -1; 743 size_t size; 744 745 snd_assert(rsubstream != NULL, return -EINVAL); 746 *rsubstream = NULL; 747 snd_assert(pcm != NULL, return -ENXIO); 748 pstr = &pcm->streams[stream]; 749 if (pstr->substream == NULL) 750 return -ENODEV; 751 752 card = pcm->card; 753 down_read(&card->controls_rwsem); 754 list_for_each(list, &card->ctl_files) { 755 kctl = snd_ctl_file(list); 756 if (kctl->pid == current->pid) { 757 prefer_subdevice = kctl->prefer_pcm_subdevice; 758 break; 759 } 760 } 761 up_read(&card->controls_rwsem); 762 763 if (pstr->substream_count == 0) 764 return -ENODEV; 765 switch (stream) { 766 case SNDRV_PCM_STREAM_PLAYBACK: 767 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 768 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 769 if (SUBSTREAM_BUSY(substream)) 770 return -EAGAIN; 771 } 772 } 773 break; 774 case SNDRV_PCM_STREAM_CAPTURE: 775 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 776 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 777 if (SUBSTREAM_BUSY(substream)) 778 return -EAGAIN; 779 } 780 } 781 break; 782 default: 783 return -EINVAL; 784 } 785 786 if (prefer_subdevice >= 0) { 787 for (substream = pstr->substream; substream; substream = substream->next) 788 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 789 goto __ok; 790 } 791 for (substream = pstr->substream; substream; substream = substream->next) 792 if (!SUBSTREAM_BUSY(substream)) 793 break; 794 __ok: 795 if (substream == NULL) 796 return -EAGAIN; 797 798 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 799 if (runtime == NULL) 800 return -ENOMEM; 801 802 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)); 803 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 804 if (runtime->status == NULL) { 805 kfree(runtime); 806 return -ENOMEM; 807 } 808 memset((void*)runtime->status, 0, size); 809 810 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)); 811 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 812 if (runtime->control == NULL) { 813 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t))); 814 kfree(runtime); 815 return -ENOMEM; 816 } 817 memset((void*)runtime->control, 0, size); 818 819 init_waitqueue_head(&runtime->sleep); 820 atomic_set(&runtime->mmap_count, 0); 821 init_timer(&runtime->tick_timer); 822 runtime->tick_timer.function = snd_pcm_tick_timer_func; 823 runtime->tick_timer.data = (unsigned long) substream; 824 825 runtime->status->state = SNDRV_PCM_STATE_OPEN; 826 827 substream->runtime = runtime; 828 substream->private_data = pcm->private_data; 829 pstr->substream_opened++; 830 *rsubstream = substream; 831 return 0; 832 } 833 834 void snd_pcm_release_substream(snd_pcm_substream_t *substream) 835 { 836 snd_pcm_runtime_t * runtime; 837 substream->file = NULL; 838 runtime = substream->runtime; 839 snd_assert(runtime != NULL, return); 840 if (runtime->private_free != NULL) 841 runtime->private_free(runtime); 842 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t))); 843 snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t))); 844 kfree(runtime->hw_constraints.rules); 845 kfree(runtime); 846 substream->runtime = NULL; 847 substream->pstr->substream_opened--; 848 } 849 850 static int snd_pcm_dev_register(snd_device_t *device) 851 { 852 int idx, cidx, err; 853 unsigned short minor; 854 snd_pcm_substream_t *substream; 855 struct list_head *list; 856 char str[16]; 857 snd_pcm_t *pcm = device->device_data; 858 859 snd_assert(pcm != NULL && device != NULL, return -ENXIO); 860 down(®ister_mutex); 861 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 862 if (snd_pcm_devices[idx]) { 863 up(®ister_mutex); 864 return -EBUSY; 865 } 866 snd_pcm_devices[idx] = pcm; 867 for (cidx = 0; cidx < 2; cidx++) { 868 int devtype = -1; 869 if (pcm->streams[cidx].substream == NULL) 870 continue; 871 switch (cidx) { 872 case SNDRV_PCM_STREAM_PLAYBACK: 873 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 874 minor = SNDRV_MINOR_PCM_PLAYBACK + idx; 875 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 876 break; 877 case SNDRV_PCM_STREAM_CAPTURE: 878 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 879 minor = SNDRV_MINOR_PCM_CAPTURE + idx; 880 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 881 break; 882 } 883 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) { 884 snd_pcm_devices[idx] = NULL; 885 up(®ister_mutex); 886 return err; 887 } 888 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 889 snd_pcm_timer_init(substream); 890 } 891 list_for_each(list, &snd_pcm_notify_list) { 892 snd_pcm_notify_t *notify; 893 notify = list_entry(list, snd_pcm_notify_t, list); 894 notify->n_register(pcm); 895 } 896 up(®ister_mutex); 897 return 0; 898 } 899 900 static int snd_pcm_dev_disconnect(snd_device_t *device) 901 { 902 snd_pcm_t *pcm = device->device_data; 903 struct list_head *list; 904 snd_pcm_substream_t *substream; 905 int idx, cidx; 906 907 down(®ister_mutex); 908 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 909 snd_pcm_devices[idx] = NULL; 910 for (cidx = 0; cidx < 2; cidx++) 911 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 912 if (substream->runtime) 913 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 914 list_for_each(list, &snd_pcm_notify_list) { 915 snd_pcm_notify_t *notify; 916 notify = list_entry(list, snd_pcm_notify_t, list); 917 notify->n_disconnect(pcm); 918 } 919 up(®ister_mutex); 920 return 0; 921 } 922 923 static int snd_pcm_dev_unregister(snd_device_t *device) 924 { 925 int idx, cidx, devtype; 926 snd_pcm_substream_t *substream; 927 struct list_head *list; 928 snd_pcm_t *pcm = device->device_data; 929 930 snd_assert(pcm != NULL, return -ENXIO); 931 down(®ister_mutex); 932 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 933 snd_pcm_devices[idx] = NULL; 934 for (cidx = 0; cidx < 2; cidx++) { 935 devtype = -1; 936 switch (cidx) { 937 case SNDRV_PCM_STREAM_PLAYBACK: 938 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 939 break; 940 case SNDRV_PCM_STREAM_CAPTURE: 941 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 942 break; 943 } 944 snd_unregister_device(devtype, pcm->card, pcm->device); 945 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 946 snd_pcm_timer_done(substream); 947 } 948 list_for_each(list, &snd_pcm_notify_list) { 949 snd_pcm_notify_t *notify; 950 notify = list_entry(list, snd_pcm_notify_t, list); 951 notify->n_unregister(pcm); 952 } 953 up(®ister_mutex); 954 return snd_pcm_free(pcm); 955 } 956 957 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree) 958 { 959 int idx; 960 961 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); 962 down(®ister_mutex); 963 if (nfree) { 964 list_del(¬ify->list); 965 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 966 if (snd_pcm_devices[idx] == NULL) 967 continue; 968 notify->n_unregister(snd_pcm_devices[idx]); 969 } 970 } else { 971 list_add_tail(¬ify->list, &snd_pcm_notify_list); 972 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 973 if (snd_pcm_devices[idx] == NULL) 974 continue; 975 notify->n_register(snd_pcm_devices[idx]); 976 } 977 } 978 up(®ister_mutex); 979 return 0; 980 } 981 982 /* 983 * Info interface 984 */ 985 986 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 987 { 988 int idx; 989 snd_pcm_t *pcm; 990 991 down(®ister_mutex); 992 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 993 pcm = snd_pcm_devices[idx]; 994 if (pcm == NULL) 995 continue; 996 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES, 997 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name); 998 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 999 snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1000 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1001 snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1002 snd_iprintf(buffer, "\n"); 1003 } 1004 up(®ister_mutex); 1005 } 1006 1007 /* 1008 * ENTRY functions 1009 */ 1010 1011 static snd_info_entry_t *snd_pcm_proc_entry = NULL; 1012 1013 static int __init alsa_pcm_init(void) 1014 { 1015 snd_info_entry_t *entry; 1016 1017 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1018 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1019 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1020 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read); 1021 if (snd_info_register(entry) < 0) { 1022 snd_info_free_entry(entry); 1023 entry = NULL; 1024 } 1025 } 1026 snd_pcm_proc_entry = entry; 1027 return 0; 1028 } 1029 1030 static void __exit alsa_pcm_exit(void) 1031 { 1032 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1033 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1034 if (snd_pcm_proc_entry) { 1035 snd_info_unregister(snd_pcm_proc_entry); 1036 snd_pcm_proc_entry = NULL; 1037 } 1038 } 1039 1040 module_init(alsa_pcm_init) 1041 module_exit(alsa_pcm_exit) 1042 1043 EXPORT_SYMBOL(snd_pcm_devices); 1044 EXPORT_SYMBOL(snd_pcm_new); 1045 EXPORT_SYMBOL(snd_pcm_new_stream); 1046 EXPORT_SYMBOL(snd_pcm_notify); 1047 EXPORT_SYMBOL(snd_pcm_open_substream); 1048 EXPORT_SYMBOL(snd_pcm_release_substream); 1049 EXPORT_SYMBOL(snd_pcm_format_name); 1050 /* pcm_native.c */ 1051 EXPORT_SYMBOL(snd_pcm_link_rwlock); 1052 #ifdef CONFIG_PM 1053 EXPORT_SYMBOL(snd_pcm_suspend); 1054 EXPORT_SYMBOL(snd_pcm_suspend_all); 1055 #endif 1056 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl); 1057 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl); 1058 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 1059 EXPORT_SYMBOL(snd_pcm_mmap_data); 1060 #if SNDRV_PCM_INFO_MMAP_IOMEM 1061 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 1062 #endif 1063 /* pcm_misc.c */ 1064 EXPORT_SYMBOL(snd_pcm_format_signed); 1065 EXPORT_SYMBOL(snd_pcm_format_unsigned); 1066 EXPORT_SYMBOL(snd_pcm_format_linear); 1067 EXPORT_SYMBOL(snd_pcm_format_little_endian); 1068 EXPORT_SYMBOL(snd_pcm_format_big_endian); 1069 EXPORT_SYMBOL(snd_pcm_format_width); 1070 EXPORT_SYMBOL(snd_pcm_format_physical_width); 1071 EXPORT_SYMBOL(snd_pcm_format_size); 1072 EXPORT_SYMBOL(snd_pcm_format_silence_64); 1073 EXPORT_SYMBOL(snd_pcm_format_set_silence); 1074 EXPORT_SYMBOL(snd_pcm_build_linear_format); 1075 EXPORT_SYMBOL(snd_pcm_limit_hw_rates); 1076