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 if (! substream) 277 return; 278 279 info = kmalloc(sizeof(*info), GFP_KERNEL); 280 if (! info) { 281 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 282 return; 283 } 284 285 err = snd_pcm_info(substream, info); 286 if (err < 0) { 287 snd_iprintf(buffer, "error %d\n", err); 288 kfree(info); 289 return; 290 } 291 snd_iprintf(buffer, "card: %d\n", info->card); 292 snd_iprintf(buffer, "device: %d\n", info->device); 293 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 294 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 295 snd_iprintf(buffer, "id: %s\n", info->id); 296 snd_iprintf(buffer, "name: %s\n", info->name); 297 snd_iprintf(buffer, "subname: %s\n", info->subname); 298 snd_iprintf(buffer, "class: %d\n", info->dev_class); 299 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 300 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 301 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 302 kfree(info); 303 } 304 305 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 306 { 307 snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer); 308 } 309 310 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 311 { 312 snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer); 313 } 314 315 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 316 { 317 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 318 snd_pcm_runtime_t *runtime = substream->runtime; 319 if (!runtime) { 320 snd_iprintf(buffer, "closed\n"); 321 return; 322 } 323 snd_pcm_stream_lock_irq(substream); 324 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 325 snd_iprintf(buffer, "no setup\n"); 326 snd_pcm_stream_unlock_irq(substream); 327 return; 328 } 329 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 330 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 331 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 332 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 333 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 334 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 335 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 336 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time); 337 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 338 if (substream->oss.oss) { 339 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 340 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 341 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 342 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 343 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 344 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 345 } 346 #endif 347 snd_pcm_stream_unlock_irq(substream); 348 } 349 350 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 351 { 352 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 353 snd_pcm_runtime_t *runtime = substream->runtime; 354 if (!runtime) { 355 snd_iprintf(buffer, "closed\n"); 356 return; 357 } 358 snd_pcm_stream_lock_irq(substream); 359 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 360 snd_iprintf(buffer, "no setup\n"); 361 snd_pcm_stream_unlock_irq(substream); 362 return; 363 } 364 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 365 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 366 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min); 367 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 368 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align); 369 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 370 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 371 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 372 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 373 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 374 snd_pcm_stream_unlock_irq(substream); 375 } 376 377 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 378 { 379 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 380 snd_pcm_runtime_t *runtime = substream->runtime; 381 snd_pcm_status_t status; 382 int err; 383 if (!runtime) { 384 snd_iprintf(buffer, "closed\n"); 385 return; 386 } 387 memset(&status, 0, sizeof(status)); 388 err = snd_pcm_status(substream, &status); 389 if (err < 0) { 390 snd_iprintf(buffer, "error %d\n", err); 391 return; 392 } 393 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 394 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 395 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 396 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 397 status.tstamp.tv_sec, status.tstamp.tv_nsec); 398 snd_iprintf(buffer, "delay : %ld\n", status.delay); 399 snd_iprintf(buffer, "avail : %ld\n", status.avail); 400 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 401 snd_iprintf(buffer, "-----\n"); 402 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 403 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 404 } 405 #endif 406 407 #ifdef CONFIG_SND_DEBUG 408 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 409 { 410 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data; 411 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 412 } 413 414 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 415 { 416 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data; 417 char line[64]; 418 if (!snd_info_get_line(buffer, line, sizeof(line))) 419 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 420 } 421 #endif 422 423 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr) 424 { 425 snd_pcm_t *pcm = pstr->pcm; 426 snd_info_entry_t *entry; 427 char name[16]; 428 429 sprintf(name, "pcm%i%c", pcm->device, 430 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 431 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 432 return -ENOMEM; 433 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 434 if (snd_info_register(entry) < 0) { 435 snd_info_free_entry(entry); 436 return -ENOMEM; 437 } 438 pstr->proc_root = entry; 439 440 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 441 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read); 442 if (snd_info_register(entry) < 0) { 443 snd_info_free_entry(entry); 444 entry = NULL; 445 } 446 } 447 pstr->proc_info_entry = entry; 448 449 #ifdef CONFIG_SND_DEBUG 450 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) { 451 entry->c.text.read_size = 64; 452 entry->c.text.read = snd_pcm_xrun_debug_read; 453 entry->c.text.write_size = 64; 454 entry->c.text.write = snd_pcm_xrun_debug_write; 455 entry->mode |= S_IWUSR; 456 entry->private_data = pstr; 457 if (snd_info_register(entry) < 0) { 458 snd_info_free_entry(entry); 459 entry = NULL; 460 } 461 } 462 pstr->proc_xrun_debug_entry = entry; 463 #endif 464 return 0; 465 } 466 467 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr) 468 { 469 #ifdef CONFIG_SND_DEBUG 470 if (pstr->proc_xrun_debug_entry) { 471 snd_info_unregister(pstr->proc_xrun_debug_entry); 472 pstr->proc_xrun_debug_entry = NULL; 473 } 474 #endif 475 if (pstr->proc_info_entry) { 476 snd_info_unregister(pstr->proc_info_entry); 477 pstr->proc_info_entry = NULL; 478 } 479 if (pstr->proc_root) { 480 snd_info_unregister(pstr->proc_root); 481 pstr->proc_root = NULL; 482 } 483 return 0; 484 } 485 486 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream) 487 { 488 snd_info_entry_t *entry; 489 snd_card_t *card; 490 char name[16]; 491 492 card = substream->pcm->card; 493 494 sprintf(name, "sub%i", substream->number); 495 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 496 return -ENOMEM; 497 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 498 if (snd_info_register(entry) < 0) { 499 snd_info_free_entry(entry); 500 return -ENOMEM; 501 } 502 substream->proc_root = entry; 503 504 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 505 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read); 506 if (snd_info_register(entry) < 0) { 507 snd_info_free_entry(entry); 508 entry = NULL; 509 } 510 } 511 substream->proc_info_entry = entry; 512 513 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 514 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read); 515 if (snd_info_register(entry) < 0) { 516 snd_info_free_entry(entry); 517 entry = NULL; 518 } 519 } 520 substream->proc_hw_params_entry = entry; 521 522 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 523 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read); 524 if (snd_info_register(entry) < 0) { 525 snd_info_free_entry(entry); 526 entry = NULL; 527 } 528 } 529 substream->proc_sw_params_entry = entry; 530 531 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 532 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read); 533 if (snd_info_register(entry) < 0) { 534 snd_info_free_entry(entry); 535 entry = NULL; 536 } 537 } 538 substream->proc_status_entry = entry; 539 540 return 0; 541 } 542 543 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream) 544 { 545 if (substream->proc_info_entry) { 546 snd_info_unregister(substream->proc_info_entry); 547 substream->proc_info_entry = NULL; 548 } 549 if (substream->proc_hw_params_entry) { 550 snd_info_unregister(substream->proc_hw_params_entry); 551 substream->proc_hw_params_entry = NULL; 552 } 553 if (substream->proc_sw_params_entry) { 554 snd_info_unregister(substream->proc_sw_params_entry); 555 substream->proc_sw_params_entry = NULL; 556 } 557 if (substream->proc_status_entry) { 558 snd_info_unregister(substream->proc_status_entry); 559 substream->proc_status_entry = NULL; 560 } 561 if (substream->proc_root) { 562 snd_info_unregister(substream->proc_root); 563 substream->proc_root = NULL; 564 } 565 return 0; 566 } 567 568 /** 569 * snd_pcm_new_stream - create a new PCM stream 570 * @pcm: the pcm instance 571 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 572 * @substream_count: the number of substreams 573 * 574 * Creates a new stream for the pcm. 575 * The corresponding stream on the pcm must have been empty before 576 * calling this, i.e. zero must be given to the argument of 577 * snd_pcm_new(). 578 * 579 * Returns zero if successful, or a negative error code on failure. 580 */ 581 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count) 582 { 583 int idx, err; 584 snd_pcm_str_t *pstr = &pcm->streams[stream]; 585 snd_pcm_substream_t *substream, *prev; 586 587 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 588 init_MUTEX(&pstr->oss.setup_mutex); 589 #endif 590 pstr->stream = stream; 591 pstr->pcm = pcm; 592 pstr->substream_count = substream_count; 593 pstr->reg = &snd_pcm_reg[stream]; 594 if (substream_count > 0) { 595 err = snd_pcm_stream_proc_init(pstr); 596 if (err < 0) 597 return err; 598 } 599 prev = NULL; 600 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 601 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 602 if (substream == NULL) 603 return -ENOMEM; 604 substream->pcm = pcm; 605 substream->pstr = pstr; 606 substream->number = idx; 607 substream->stream = stream; 608 sprintf(substream->name, "subdevice #%i", idx); 609 substream->buffer_bytes_max = UINT_MAX; 610 if (prev == NULL) 611 pstr->substream = substream; 612 else 613 prev->next = substream; 614 err = snd_pcm_substream_proc_init(substream); 615 if (err < 0) { 616 kfree(substream); 617 return err; 618 } 619 substream->group = &substream->self_group; 620 spin_lock_init(&substream->self_group.lock); 621 INIT_LIST_HEAD(&substream->self_group.substreams); 622 list_add_tail(&substream->link_list, &substream->self_group.substreams); 623 spin_lock_init(&substream->timer_lock); 624 prev = substream; 625 } 626 return 0; 627 } 628 629 /** 630 * snd_pcm_new - create a new PCM instance 631 * @card: the card instance 632 * @id: the id string 633 * @device: the device index (zero based) 634 * @playback_count: the number of substreams for playback 635 * @capture_count: the number of substreams for capture 636 * @rpcm: the pointer to store the new pcm instance 637 * 638 * Creates a new PCM instance. 639 * 640 * The pcm operators have to be set afterwards to the new instance 641 * via snd_pcm_set_ops(). 642 * 643 * Returns zero if successful, or a negative error code on failure. 644 */ 645 int snd_pcm_new(snd_card_t * card, char *id, int device, 646 int playback_count, int capture_count, 647 snd_pcm_t ** rpcm) 648 { 649 snd_pcm_t *pcm; 650 int err; 651 static snd_device_ops_t ops = { 652 .dev_free = snd_pcm_dev_free, 653 .dev_register = snd_pcm_dev_register, 654 .dev_disconnect = snd_pcm_dev_disconnect, 655 .dev_unregister = snd_pcm_dev_unregister 656 }; 657 658 snd_assert(rpcm != NULL, return -EINVAL); 659 *rpcm = NULL; 660 snd_assert(card != NULL, return -ENXIO); 661 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 662 if (pcm == NULL) 663 return -ENOMEM; 664 pcm->card = card; 665 pcm->device = device; 666 if (id) { 667 strlcpy(pcm->id, id, sizeof(pcm->id)); 668 } 669 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 670 snd_pcm_free(pcm); 671 return err; 672 } 673 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 674 snd_pcm_free(pcm); 675 return err; 676 } 677 init_MUTEX(&pcm->open_mutex); 678 init_waitqueue_head(&pcm->open_wait); 679 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 680 snd_pcm_free(pcm); 681 return err; 682 } 683 *rpcm = pcm; 684 return 0; 685 } 686 687 static void snd_pcm_free_stream(snd_pcm_str_t * pstr) 688 { 689 snd_pcm_substream_t *substream, *substream_next; 690 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 691 snd_pcm_oss_setup_t *setup, *setupn; 692 #endif 693 substream = pstr->substream; 694 while (substream) { 695 substream_next = substream->next; 696 snd_pcm_substream_proc_done(substream); 697 kfree(substream); 698 substream = substream_next; 699 } 700 snd_pcm_stream_proc_done(pstr); 701 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 702 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 703 setupn = setup->next; 704 kfree(setup->task_name); 705 kfree(setup); 706 } 707 #endif 708 } 709 710 static int snd_pcm_free(snd_pcm_t *pcm) 711 { 712 snd_assert(pcm != NULL, return -ENXIO); 713 if (pcm->private_free) 714 pcm->private_free(pcm); 715 snd_pcm_lib_preallocate_free_for_all(pcm); 716 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 717 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 718 kfree(pcm); 719 return 0; 720 } 721 722 static int snd_pcm_dev_free(snd_device_t *device) 723 { 724 snd_pcm_t *pcm = device->device_data; 725 return snd_pcm_free(pcm); 726 } 727 728 static void snd_pcm_tick_timer_func(unsigned long data) 729 { 730 snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data; 731 snd_pcm_tick_elapsed(substream); 732 } 733 734 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream, 735 snd_pcm_substream_t **rsubstream) 736 { 737 snd_pcm_str_t * pstr; 738 snd_pcm_substream_t * substream; 739 snd_pcm_runtime_t * runtime; 740 snd_ctl_file_t *kctl; 741 snd_card_t *card; 742 struct list_head *list; 743 int prefer_subdevice = -1; 744 size_t size; 745 746 snd_assert(rsubstream != NULL, return -EINVAL); 747 *rsubstream = NULL; 748 snd_assert(pcm != NULL, return -ENXIO); 749 pstr = &pcm->streams[stream]; 750 if (pstr->substream == NULL) 751 return -ENODEV; 752 753 card = pcm->card; 754 down_read(&card->controls_rwsem); 755 list_for_each(list, &card->ctl_files) { 756 kctl = snd_ctl_file(list); 757 if (kctl->pid == current->pid) { 758 prefer_subdevice = kctl->prefer_pcm_subdevice; 759 break; 760 } 761 } 762 up_read(&card->controls_rwsem); 763 764 if (pstr->substream_count == 0) 765 return -ENODEV; 766 switch (stream) { 767 case SNDRV_PCM_STREAM_PLAYBACK: 768 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 769 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 770 if (SUBSTREAM_BUSY(substream)) 771 return -EAGAIN; 772 } 773 } 774 break; 775 case SNDRV_PCM_STREAM_CAPTURE: 776 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 777 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 778 if (SUBSTREAM_BUSY(substream)) 779 return -EAGAIN; 780 } 781 } 782 break; 783 default: 784 return -EINVAL; 785 } 786 787 if (prefer_subdevice >= 0) { 788 for (substream = pstr->substream; substream; substream = substream->next) 789 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 790 goto __ok; 791 } 792 for (substream = pstr->substream; substream; substream = substream->next) 793 if (!SUBSTREAM_BUSY(substream)) 794 break; 795 __ok: 796 if (substream == NULL) 797 return -EAGAIN; 798 799 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 800 if (runtime == NULL) 801 return -ENOMEM; 802 803 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)); 804 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 805 if (runtime->status == NULL) { 806 kfree(runtime); 807 return -ENOMEM; 808 } 809 memset((void*)runtime->status, 0, size); 810 811 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)); 812 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 813 if (runtime->control == NULL) { 814 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t))); 815 kfree(runtime); 816 return -ENOMEM; 817 } 818 memset((void*)runtime->control, 0, size); 819 820 init_waitqueue_head(&runtime->sleep); 821 atomic_set(&runtime->mmap_count, 0); 822 init_timer(&runtime->tick_timer); 823 runtime->tick_timer.function = snd_pcm_tick_timer_func; 824 runtime->tick_timer.data = (unsigned long) substream; 825 826 runtime->status->state = SNDRV_PCM_STATE_OPEN; 827 828 substream->runtime = runtime; 829 substream->private_data = pcm->private_data; 830 pstr->substream_opened++; 831 *rsubstream = substream; 832 return 0; 833 } 834 835 void snd_pcm_release_substream(snd_pcm_substream_t *substream) 836 { 837 snd_pcm_runtime_t * runtime; 838 substream->file = NULL; 839 runtime = substream->runtime; 840 snd_assert(runtime != NULL, return); 841 if (runtime->private_free != NULL) 842 runtime->private_free(runtime); 843 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t))); 844 snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t))); 845 kfree(runtime->hw_constraints.rules); 846 kfree(runtime); 847 substream->runtime = NULL; 848 substream->pstr->substream_opened--; 849 } 850 851 static int snd_pcm_dev_register(snd_device_t *device) 852 { 853 int idx, cidx, err; 854 unsigned short minor; 855 snd_pcm_substream_t *substream; 856 struct list_head *list; 857 char str[16]; 858 snd_pcm_t *pcm = device->device_data; 859 860 snd_assert(pcm != NULL && device != NULL, return -ENXIO); 861 down(®ister_mutex); 862 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 863 if (snd_pcm_devices[idx]) { 864 up(®ister_mutex); 865 return -EBUSY; 866 } 867 snd_pcm_devices[idx] = pcm; 868 for (cidx = 0; cidx < 2; cidx++) { 869 int devtype = -1; 870 if (pcm->streams[cidx].substream == NULL) 871 continue; 872 switch (cidx) { 873 case SNDRV_PCM_STREAM_PLAYBACK: 874 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 875 minor = SNDRV_MINOR_PCM_PLAYBACK + idx; 876 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 877 break; 878 case SNDRV_PCM_STREAM_CAPTURE: 879 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 880 minor = SNDRV_MINOR_PCM_CAPTURE + idx; 881 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 882 break; 883 } 884 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) { 885 snd_pcm_devices[idx] = NULL; 886 up(®ister_mutex); 887 return err; 888 } 889 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 890 snd_pcm_timer_init(substream); 891 } 892 list_for_each(list, &snd_pcm_notify_list) { 893 snd_pcm_notify_t *notify; 894 notify = list_entry(list, snd_pcm_notify_t, list); 895 notify->n_register(pcm); 896 } 897 up(®ister_mutex); 898 return 0; 899 } 900 901 static int snd_pcm_dev_disconnect(snd_device_t *device) 902 { 903 snd_pcm_t *pcm = device->device_data; 904 struct list_head *list; 905 snd_pcm_substream_t *substream; 906 int idx, cidx; 907 908 down(®ister_mutex); 909 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 910 snd_pcm_devices[idx] = NULL; 911 for (cidx = 0; cidx < 2; cidx++) 912 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 913 if (substream->runtime) 914 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 915 list_for_each(list, &snd_pcm_notify_list) { 916 snd_pcm_notify_t *notify; 917 notify = list_entry(list, snd_pcm_notify_t, list); 918 notify->n_disconnect(pcm); 919 } 920 up(®ister_mutex); 921 return 0; 922 } 923 924 static int snd_pcm_dev_unregister(snd_device_t *device) 925 { 926 int idx, cidx, devtype; 927 snd_pcm_substream_t *substream; 928 struct list_head *list; 929 snd_pcm_t *pcm = device->device_data; 930 931 snd_assert(pcm != NULL, return -ENXIO); 932 down(®ister_mutex); 933 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 934 snd_pcm_devices[idx] = NULL; 935 for (cidx = 0; cidx < 2; cidx++) { 936 devtype = -1; 937 switch (cidx) { 938 case SNDRV_PCM_STREAM_PLAYBACK: 939 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 940 break; 941 case SNDRV_PCM_STREAM_CAPTURE: 942 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 943 break; 944 } 945 snd_unregister_device(devtype, pcm->card, pcm->device); 946 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 947 snd_pcm_timer_done(substream); 948 } 949 list_for_each(list, &snd_pcm_notify_list) { 950 snd_pcm_notify_t *notify; 951 notify = list_entry(list, snd_pcm_notify_t, list); 952 notify->n_unregister(pcm); 953 } 954 up(®ister_mutex); 955 return snd_pcm_free(pcm); 956 } 957 958 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree) 959 { 960 int idx; 961 962 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); 963 down(®ister_mutex); 964 if (nfree) { 965 list_del(¬ify->list); 966 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 967 if (snd_pcm_devices[idx] == NULL) 968 continue; 969 notify->n_unregister(snd_pcm_devices[idx]); 970 } 971 } else { 972 list_add_tail(¬ify->list, &snd_pcm_notify_list); 973 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 974 if (snd_pcm_devices[idx] == NULL) 975 continue; 976 notify->n_register(snd_pcm_devices[idx]); 977 } 978 } 979 up(®ister_mutex); 980 return 0; 981 } 982 983 /* 984 * Info interface 985 */ 986 987 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 988 { 989 int idx; 990 snd_pcm_t *pcm; 991 992 down(®ister_mutex); 993 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 994 pcm = snd_pcm_devices[idx]; 995 if (pcm == NULL) 996 continue; 997 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES, 998 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name); 999 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1000 snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1001 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1002 snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1003 snd_iprintf(buffer, "\n"); 1004 } 1005 up(®ister_mutex); 1006 } 1007 1008 /* 1009 * ENTRY functions 1010 */ 1011 1012 static snd_info_entry_t *snd_pcm_proc_entry = NULL; 1013 1014 static int __init alsa_pcm_init(void) 1015 { 1016 snd_info_entry_t *entry; 1017 1018 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1019 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1020 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1021 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read); 1022 if (snd_info_register(entry) < 0) { 1023 snd_info_free_entry(entry); 1024 entry = NULL; 1025 } 1026 } 1027 snd_pcm_proc_entry = entry; 1028 return 0; 1029 } 1030 1031 static void __exit alsa_pcm_exit(void) 1032 { 1033 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1034 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1035 if (snd_pcm_proc_entry) { 1036 snd_info_unregister(snd_pcm_proc_entry); 1037 snd_pcm_proc_entry = NULL; 1038 } 1039 } 1040 1041 module_init(alsa_pcm_init) 1042 module_exit(alsa_pcm_exit) 1043 1044 EXPORT_SYMBOL(snd_pcm_devices); 1045 EXPORT_SYMBOL(snd_pcm_new); 1046 EXPORT_SYMBOL(snd_pcm_new_stream); 1047 EXPORT_SYMBOL(snd_pcm_notify); 1048 EXPORT_SYMBOL(snd_pcm_open_substream); 1049 EXPORT_SYMBOL(snd_pcm_release_substream); 1050 EXPORT_SYMBOL(snd_pcm_format_name); 1051 /* pcm_native.c */ 1052 EXPORT_SYMBOL(snd_pcm_link_rwlock); 1053 #ifdef CONFIG_PM 1054 EXPORT_SYMBOL(snd_pcm_suspend); 1055 EXPORT_SYMBOL(snd_pcm_suspend_all); 1056 #endif 1057 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl); 1058 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl); 1059 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 1060 EXPORT_SYMBOL(snd_pcm_mmap_data); 1061 #if SNDRV_PCM_INFO_MMAP_IOMEM 1062 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 1063 #endif 1064 /* pcm_misc.c */ 1065 EXPORT_SYMBOL(snd_pcm_format_signed); 1066 EXPORT_SYMBOL(snd_pcm_format_unsigned); 1067 EXPORT_SYMBOL(snd_pcm_format_linear); 1068 EXPORT_SYMBOL(snd_pcm_format_little_endian); 1069 EXPORT_SYMBOL(snd_pcm_format_big_endian); 1070 EXPORT_SYMBOL(snd_pcm_format_width); 1071 EXPORT_SYMBOL(snd_pcm_format_physical_width); 1072 EXPORT_SYMBOL(snd_pcm_format_size); 1073 EXPORT_SYMBOL(snd_pcm_format_silence_64); 1074 EXPORT_SYMBOL(snd_pcm_format_set_silence); 1075 EXPORT_SYMBOL(snd_pcm_build_linear_format); 1076 EXPORT_SYMBOL(snd_pcm_limit_hw_rates); 1077