1 /* 2 * Dummy soundcard 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 * 19 */ 20 21 #include <linux/init.h> 22 #include <linux/err.h> 23 #include <linux/platform_device.h> 24 #include <linux/jiffies.h> 25 #include <linux/slab.h> 26 #include <linux/time.h> 27 #include <linux/wait.h> 28 #include <linux/hrtimer.h> 29 #include <linux/math64.h> 30 #include <linux/module.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/tlv.h> 34 #include <sound/pcm.h> 35 #include <sound/rawmidi.h> 36 #include <sound/info.h> 37 #include <sound/initval.h> 38 39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 40 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)"); 41 MODULE_LICENSE("GPL"); 42 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}"); 43 44 #define MAX_PCM_DEVICES 4 45 #define MAX_PCM_SUBSTREAMS 128 46 #define MAX_MIDI_DEVICES 2 47 48 /* defaults */ 49 #define MAX_BUFFER_SIZE (64*1024) 50 #define MIN_PERIOD_SIZE 64 51 #define MAX_PERIOD_SIZE MAX_BUFFER_SIZE 52 #define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE) 53 #define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000 54 #define USE_RATE_MIN 5500 55 #define USE_RATE_MAX 48000 56 #define USE_CHANNELS_MIN 1 57 #define USE_CHANNELS_MAX 2 58 #define USE_PERIODS_MIN 1 59 #define USE_PERIODS_MAX 1024 60 61 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 62 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 63 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; 64 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL}; 65 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; 66 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; 67 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2}; 68 #ifdef CONFIG_HIGH_RES_TIMERS 69 static bool hrtimer = 1; 70 #endif 71 static bool fake_buffer = 1; 72 73 module_param_array(index, int, NULL, 0444); 74 MODULE_PARM_DESC(index, "Index value for dummy soundcard."); 75 module_param_array(id, charp, NULL, 0444); 76 MODULE_PARM_DESC(id, "ID string for dummy soundcard."); 77 module_param_array(enable, bool, NULL, 0444); 78 MODULE_PARM_DESC(enable, "Enable this dummy soundcard."); 79 module_param_array(model, charp, NULL, 0444); 80 MODULE_PARM_DESC(model, "Soundcard model."); 81 module_param_array(pcm_devs, int, NULL, 0444); 82 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver."); 83 module_param_array(pcm_substreams, int, NULL, 0444); 84 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver."); 85 //module_param_array(midi_devs, int, NULL, 0444); 86 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver."); 87 module_param(fake_buffer, bool, 0444); 88 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations."); 89 #ifdef CONFIG_HIGH_RES_TIMERS 90 module_param(hrtimer, bool, 0644); 91 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source."); 92 #endif 93 94 static struct platform_device *devices[SNDRV_CARDS]; 95 96 #define MIXER_ADDR_MASTER 0 97 #define MIXER_ADDR_LINE 1 98 #define MIXER_ADDR_MIC 2 99 #define MIXER_ADDR_SYNTH 3 100 #define MIXER_ADDR_CD 4 101 #define MIXER_ADDR_LAST 4 102 103 struct dummy_timer_ops { 104 int (*create)(struct snd_pcm_substream *); 105 void (*free)(struct snd_pcm_substream *); 106 int (*prepare)(struct snd_pcm_substream *); 107 int (*start)(struct snd_pcm_substream *); 108 int (*stop)(struct snd_pcm_substream *); 109 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *); 110 }; 111 112 struct dummy_model { 113 const char *name; 114 int (*playback_constraints)(struct snd_pcm_runtime *runtime); 115 int (*capture_constraints)(struct snd_pcm_runtime *runtime); 116 u64 formats; 117 size_t buffer_bytes_max; 118 size_t period_bytes_min; 119 size_t period_bytes_max; 120 unsigned int periods_min; 121 unsigned int periods_max; 122 unsigned int rates; 123 unsigned int rate_min; 124 unsigned int rate_max; 125 unsigned int channels_min; 126 unsigned int channels_max; 127 }; 128 129 struct snd_dummy { 130 struct snd_card *card; 131 struct dummy_model *model; 132 struct snd_pcm *pcm; 133 struct snd_pcm_hardware pcm_hw; 134 spinlock_t mixer_lock; 135 int mixer_volume[MIXER_ADDR_LAST+1][2]; 136 int capture_source[MIXER_ADDR_LAST+1][2]; 137 const struct dummy_timer_ops *timer_ops; 138 }; 139 140 /* 141 * card models 142 */ 143 144 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime) 145 { 146 int err; 147 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 148 if (err < 0) 149 return err; 150 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX); 151 if (err < 0) 152 return err; 153 return 0; 154 } 155 156 struct dummy_model model_emu10k1 = { 157 .name = "emu10k1", 158 .playback_constraints = emu10k1_playback_constraints, 159 .buffer_bytes_max = 128 * 1024, 160 }; 161 162 struct dummy_model model_rme9652 = { 163 .name = "rme9652", 164 .buffer_bytes_max = 26 * 64 * 1024, 165 .formats = SNDRV_PCM_FMTBIT_S32_LE, 166 .channels_min = 26, 167 .channels_max = 26, 168 .periods_min = 2, 169 .periods_max = 2, 170 }; 171 172 struct dummy_model model_ice1712 = { 173 .name = "ice1712", 174 .buffer_bytes_max = 256 * 1024, 175 .formats = SNDRV_PCM_FMTBIT_S32_LE, 176 .channels_min = 10, 177 .channels_max = 10, 178 .periods_min = 1, 179 .periods_max = 1024, 180 }; 181 182 struct dummy_model model_uda1341 = { 183 .name = "uda1341", 184 .buffer_bytes_max = 16380, 185 .formats = SNDRV_PCM_FMTBIT_S16_LE, 186 .channels_min = 2, 187 .channels_max = 2, 188 .periods_min = 2, 189 .periods_max = 255, 190 }; 191 192 struct dummy_model model_ac97 = { 193 .name = "ac97", 194 .formats = SNDRV_PCM_FMTBIT_S16_LE, 195 .channels_min = 2, 196 .channels_max = 2, 197 .rates = SNDRV_PCM_RATE_48000, 198 .rate_min = 48000, 199 .rate_max = 48000, 200 }; 201 202 struct dummy_model model_ca0106 = { 203 .name = "ca0106", 204 .formats = SNDRV_PCM_FMTBIT_S16_LE, 205 .buffer_bytes_max = ((65536-64)*8), 206 .period_bytes_max = (65536-64), 207 .periods_min = 2, 208 .periods_max = 8, 209 .channels_min = 2, 210 .channels_max = 2, 211 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000, 212 .rate_min = 48000, 213 .rate_max = 192000, 214 }; 215 216 struct dummy_model *dummy_models[] = { 217 &model_emu10k1, 218 &model_rme9652, 219 &model_ice1712, 220 &model_uda1341, 221 &model_ac97, 222 &model_ca0106, 223 NULL 224 }; 225 226 /* 227 * system timer interface 228 */ 229 230 struct dummy_systimer_pcm { 231 spinlock_t lock; 232 struct timer_list timer; 233 unsigned long base_time; 234 unsigned int frac_pos; /* fractional sample position (based HZ) */ 235 unsigned int frac_period_rest; 236 unsigned int frac_buffer_size; /* buffer_size * HZ */ 237 unsigned int frac_period_size; /* period_size * HZ */ 238 unsigned int rate; 239 int elapsed; 240 struct snd_pcm_substream *substream; 241 }; 242 243 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm) 244 { 245 dpcm->timer.expires = jiffies + 246 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate; 247 add_timer(&dpcm->timer); 248 } 249 250 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm) 251 { 252 unsigned long delta; 253 254 delta = jiffies - dpcm->base_time; 255 if (!delta) 256 return; 257 dpcm->base_time += delta; 258 delta *= dpcm->rate; 259 dpcm->frac_pos += delta; 260 while (dpcm->frac_pos >= dpcm->frac_buffer_size) 261 dpcm->frac_pos -= dpcm->frac_buffer_size; 262 while (dpcm->frac_period_rest <= delta) { 263 dpcm->elapsed++; 264 dpcm->frac_period_rest += dpcm->frac_period_size; 265 } 266 dpcm->frac_period_rest -= delta; 267 } 268 269 static int dummy_systimer_start(struct snd_pcm_substream *substream) 270 { 271 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 272 spin_lock(&dpcm->lock); 273 dpcm->base_time = jiffies; 274 dummy_systimer_rearm(dpcm); 275 spin_unlock(&dpcm->lock); 276 return 0; 277 } 278 279 static int dummy_systimer_stop(struct snd_pcm_substream *substream) 280 { 281 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 282 spin_lock(&dpcm->lock); 283 del_timer(&dpcm->timer); 284 spin_unlock(&dpcm->lock); 285 return 0; 286 } 287 288 static int dummy_systimer_prepare(struct snd_pcm_substream *substream) 289 { 290 struct snd_pcm_runtime *runtime = substream->runtime; 291 struct dummy_systimer_pcm *dpcm = runtime->private_data; 292 293 dpcm->frac_pos = 0; 294 dpcm->rate = runtime->rate; 295 dpcm->frac_buffer_size = runtime->buffer_size * HZ; 296 dpcm->frac_period_size = runtime->period_size * HZ; 297 dpcm->frac_period_rest = dpcm->frac_period_size; 298 dpcm->elapsed = 0; 299 300 return 0; 301 } 302 303 static void dummy_systimer_callback(unsigned long data) 304 { 305 struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data; 306 unsigned long flags; 307 int elapsed = 0; 308 309 spin_lock_irqsave(&dpcm->lock, flags); 310 dummy_systimer_update(dpcm); 311 dummy_systimer_rearm(dpcm); 312 elapsed = dpcm->elapsed; 313 dpcm->elapsed = 0; 314 spin_unlock_irqrestore(&dpcm->lock, flags); 315 if (elapsed) 316 snd_pcm_period_elapsed(dpcm->substream); 317 } 318 319 static snd_pcm_uframes_t 320 dummy_systimer_pointer(struct snd_pcm_substream *substream) 321 { 322 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 323 snd_pcm_uframes_t pos; 324 325 spin_lock(&dpcm->lock); 326 dummy_systimer_update(dpcm); 327 pos = dpcm->frac_pos / HZ; 328 spin_unlock(&dpcm->lock); 329 return pos; 330 } 331 332 static int dummy_systimer_create(struct snd_pcm_substream *substream) 333 { 334 struct dummy_systimer_pcm *dpcm; 335 336 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 337 if (!dpcm) 338 return -ENOMEM; 339 substream->runtime->private_data = dpcm; 340 init_timer(&dpcm->timer); 341 dpcm->timer.data = (unsigned long) dpcm; 342 dpcm->timer.function = dummy_systimer_callback; 343 spin_lock_init(&dpcm->lock); 344 dpcm->substream = substream; 345 return 0; 346 } 347 348 static void dummy_systimer_free(struct snd_pcm_substream *substream) 349 { 350 kfree(substream->runtime->private_data); 351 } 352 353 static struct dummy_timer_ops dummy_systimer_ops = { 354 .create = dummy_systimer_create, 355 .free = dummy_systimer_free, 356 .prepare = dummy_systimer_prepare, 357 .start = dummy_systimer_start, 358 .stop = dummy_systimer_stop, 359 .pointer = dummy_systimer_pointer, 360 }; 361 362 #ifdef CONFIG_HIGH_RES_TIMERS 363 /* 364 * hrtimer interface 365 */ 366 367 struct dummy_hrtimer_pcm { 368 ktime_t base_time; 369 ktime_t period_time; 370 atomic_t running; 371 struct hrtimer timer; 372 struct tasklet_struct tasklet; 373 struct snd_pcm_substream *substream; 374 }; 375 376 static void dummy_hrtimer_pcm_elapsed(unsigned long priv) 377 { 378 struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv; 379 if (atomic_read(&dpcm->running)) 380 snd_pcm_period_elapsed(dpcm->substream); 381 } 382 383 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer) 384 { 385 struct dummy_hrtimer_pcm *dpcm; 386 387 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer); 388 if (!atomic_read(&dpcm->running)) 389 return HRTIMER_NORESTART; 390 tasklet_schedule(&dpcm->tasklet); 391 hrtimer_forward_now(timer, dpcm->period_time); 392 return HRTIMER_RESTART; 393 } 394 395 static int dummy_hrtimer_start(struct snd_pcm_substream *substream) 396 { 397 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 398 399 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer); 400 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL); 401 atomic_set(&dpcm->running, 1); 402 return 0; 403 } 404 405 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream) 406 { 407 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 408 409 atomic_set(&dpcm->running, 0); 410 hrtimer_cancel(&dpcm->timer); 411 return 0; 412 } 413 414 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm) 415 { 416 tasklet_kill(&dpcm->tasklet); 417 } 418 419 static snd_pcm_uframes_t 420 dummy_hrtimer_pointer(struct snd_pcm_substream *substream) 421 { 422 struct snd_pcm_runtime *runtime = substream->runtime; 423 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 424 u64 delta; 425 u32 pos; 426 427 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer), 428 dpcm->base_time); 429 delta = div_u64(delta * runtime->rate + 999999, 1000000); 430 div_u64_rem(delta, runtime->buffer_size, &pos); 431 return pos; 432 } 433 434 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream) 435 { 436 struct snd_pcm_runtime *runtime = substream->runtime; 437 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 438 unsigned int period, rate; 439 long sec; 440 unsigned long nsecs; 441 442 dummy_hrtimer_sync(dpcm); 443 period = runtime->period_size; 444 rate = runtime->rate; 445 sec = period / rate; 446 period %= rate; 447 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate); 448 dpcm->period_time = ktime_set(sec, nsecs); 449 450 return 0; 451 } 452 453 static int dummy_hrtimer_create(struct snd_pcm_substream *substream) 454 { 455 struct dummy_hrtimer_pcm *dpcm; 456 457 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 458 if (!dpcm) 459 return -ENOMEM; 460 substream->runtime->private_data = dpcm; 461 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 462 dpcm->timer.function = dummy_hrtimer_callback; 463 dpcm->substream = substream; 464 atomic_set(&dpcm->running, 0); 465 tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed, 466 (unsigned long)dpcm); 467 return 0; 468 } 469 470 static void dummy_hrtimer_free(struct snd_pcm_substream *substream) 471 { 472 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 473 dummy_hrtimer_sync(dpcm); 474 kfree(dpcm); 475 } 476 477 static struct dummy_timer_ops dummy_hrtimer_ops = { 478 .create = dummy_hrtimer_create, 479 .free = dummy_hrtimer_free, 480 .prepare = dummy_hrtimer_prepare, 481 .start = dummy_hrtimer_start, 482 .stop = dummy_hrtimer_stop, 483 .pointer = dummy_hrtimer_pointer, 484 }; 485 486 #endif /* CONFIG_HIGH_RES_TIMERS */ 487 488 /* 489 * PCM interface 490 */ 491 492 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 493 { 494 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 495 496 switch (cmd) { 497 case SNDRV_PCM_TRIGGER_START: 498 case SNDRV_PCM_TRIGGER_RESUME: 499 return dummy->timer_ops->start(substream); 500 case SNDRV_PCM_TRIGGER_STOP: 501 case SNDRV_PCM_TRIGGER_SUSPEND: 502 return dummy->timer_ops->stop(substream); 503 } 504 return -EINVAL; 505 } 506 507 static int dummy_pcm_prepare(struct snd_pcm_substream *substream) 508 { 509 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 510 511 return dummy->timer_ops->prepare(substream); 512 } 513 514 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream) 515 { 516 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 517 518 return dummy->timer_ops->pointer(substream); 519 } 520 521 static struct snd_pcm_hardware dummy_pcm_hardware = { 522 .info = (SNDRV_PCM_INFO_MMAP | 523 SNDRV_PCM_INFO_INTERLEAVED | 524 SNDRV_PCM_INFO_RESUME | 525 SNDRV_PCM_INFO_MMAP_VALID), 526 .formats = USE_FORMATS, 527 .rates = USE_RATE, 528 .rate_min = USE_RATE_MIN, 529 .rate_max = USE_RATE_MAX, 530 .channels_min = USE_CHANNELS_MIN, 531 .channels_max = USE_CHANNELS_MAX, 532 .buffer_bytes_max = MAX_BUFFER_SIZE, 533 .period_bytes_min = MIN_PERIOD_SIZE, 534 .period_bytes_max = MAX_PERIOD_SIZE, 535 .periods_min = USE_PERIODS_MIN, 536 .periods_max = USE_PERIODS_MAX, 537 .fifo_size = 0, 538 }; 539 540 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream, 541 struct snd_pcm_hw_params *hw_params) 542 { 543 if (fake_buffer) { 544 /* runtime->dma_bytes has to be set manually to allow mmap */ 545 substream->runtime->dma_bytes = params_buffer_bytes(hw_params); 546 return 0; 547 } 548 return snd_pcm_lib_malloc_pages(substream, 549 params_buffer_bytes(hw_params)); 550 } 551 552 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream) 553 { 554 if (fake_buffer) 555 return 0; 556 return snd_pcm_lib_free_pages(substream); 557 } 558 559 static int dummy_pcm_open(struct snd_pcm_substream *substream) 560 { 561 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 562 struct dummy_model *model = dummy->model; 563 struct snd_pcm_runtime *runtime = substream->runtime; 564 int err; 565 566 dummy->timer_ops = &dummy_systimer_ops; 567 #ifdef CONFIG_HIGH_RES_TIMERS 568 if (hrtimer) 569 dummy->timer_ops = &dummy_hrtimer_ops; 570 #endif 571 572 err = dummy->timer_ops->create(substream); 573 if (err < 0) 574 return err; 575 576 runtime->hw = dummy->pcm_hw; 577 if (substream->pcm->device & 1) { 578 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED; 579 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED; 580 } 581 if (substream->pcm->device & 2) 582 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP | 583 SNDRV_PCM_INFO_MMAP_VALID); 584 585 if (model == NULL) 586 return 0; 587 588 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 589 if (model->playback_constraints) 590 err = model->playback_constraints(substream->runtime); 591 } else { 592 if (model->capture_constraints) 593 err = model->capture_constraints(substream->runtime); 594 } 595 if (err < 0) { 596 dummy->timer_ops->free(substream); 597 return err; 598 } 599 return 0; 600 } 601 602 static int dummy_pcm_close(struct snd_pcm_substream *substream) 603 { 604 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 605 dummy->timer_ops->free(substream); 606 return 0; 607 } 608 609 /* 610 * dummy buffer handling 611 */ 612 613 static void *dummy_page[2]; 614 615 static void free_fake_buffer(void) 616 { 617 if (fake_buffer) { 618 int i; 619 for (i = 0; i < 2; i++) 620 if (dummy_page[i]) { 621 free_page((unsigned long)dummy_page[i]); 622 dummy_page[i] = NULL; 623 } 624 } 625 } 626 627 static int alloc_fake_buffer(void) 628 { 629 int i; 630 631 if (!fake_buffer) 632 return 0; 633 for (i = 0; i < 2; i++) { 634 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL); 635 if (!dummy_page[i]) { 636 free_fake_buffer(); 637 return -ENOMEM; 638 } 639 } 640 return 0; 641 } 642 643 static int dummy_pcm_copy(struct snd_pcm_substream *substream, 644 int channel, snd_pcm_uframes_t pos, 645 void __user *dst, snd_pcm_uframes_t count) 646 { 647 return 0; /* do nothing */ 648 } 649 650 static int dummy_pcm_silence(struct snd_pcm_substream *substream, 651 int channel, snd_pcm_uframes_t pos, 652 snd_pcm_uframes_t count) 653 { 654 return 0; /* do nothing */ 655 } 656 657 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream, 658 unsigned long offset) 659 { 660 return virt_to_page(dummy_page[substream->stream]); /* the same page */ 661 } 662 663 static struct snd_pcm_ops dummy_pcm_ops = { 664 .open = dummy_pcm_open, 665 .close = dummy_pcm_close, 666 .ioctl = snd_pcm_lib_ioctl, 667 .hw_params = dummy_pcm_hw_params, 668 .hw_free = dummy_pcm_hw_free, 669 .prepare = dummy_pcm_prepare, 670 .trigger = dummy_pcm_trigger, 671 .pointer = dummy_pcm_pointer, 672 }; 673 674 static struct snd_pcm_ops dummy_pcm_ops_no_buf = { 675 .open = dummy_pcm_open, 676 .close = dummy_pcm_close, 677 .ioctl = snd_pcm_lib_ioctl, 678 .hw_params = dummy_pcm_hw_params, 679 .hw_free = dummy_pcm_hw_free, 680 .prepare = dummy_pcm_prepare, 681 .trigger = dummy_pcm_trigger, 682 .pointer = dummy_pcm_pointer, 683 .copy = dummy_pcm_copy, 684 .silence = dummy_pcm_silence, 685 .page = dummy_pcm_page, 686 }; 687 688 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device, 689 int substreams) 690 { 691 struct snd_pcm *pcm; 692 struct snd_pcm_ops *ops; 693 int err; 694 695 err = snd_pcm_new(dummy->card, "Dummy PCM", device, 696 substreams, substreams, &pcm); 697 if (err < 0) 698 return err; 699 dummy->pcm = pcm; 700 if (fake_buffer) 701 ops = &dummy_pcm_ops_no_buf; 702 else 703 ops = &dummy_pcm_ops; 704 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops); 705 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops); 706 pcm->private_data = dummy; 707 pcm->info_flags = 0; 708 strcpy(pcm->name, "Dummy PCM"); 709 if (!fake_buffer) { 710 snd_pcm_lib_preallocate_pages_for_all(pcm, 711 SNDRV_DMA_TYPE_CONTINUOUS, 712 snd_dma_continuous_data(GFP_KERNEL), 713 0, 64*1024); 714 } 715 return 0; 716 } 717 718 /* 719 * mixer interface 720 */ 721 722 #define DUMMY_VOLUME(xname, xindex, addr) \ 723 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 724 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \ 725 .name = xname, .index = xindex, \ 726 .info = snd_dummy_volume_info, \ 727 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \ 728 .private_value = addr, \ 729 .tlv = { .p = db_scale_dummy } } 730 731 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol, 732 struct snd_ctl_elem_info *uinfo) 733 { 734 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 735 uinfo->count = 2; 736 uinfo->value.integer.min = -50; 737 uinfo->value.integer.max = 100; 738 return 0; 739 } 740 741 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol, 742 struct snd_ctl_elem_value *ucontrol) 743 { 744 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 745 int addr = kcontrol->private_value; 746 747 spin_lock_irq(&dummy->mixer_lock); 748 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0]; 749 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1]; 750 spin_unlock_irq(&dummy->mixer_lock); 751 return 0; 752 } 753 754 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol, 755 struct snd_ctl_elem_value *ucontrol) 756 { 757 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 758 int change, addr = kcontrol->private_value; 759 int left, right; 760 761 left = ucontrol->value.integer.value[0]; 762 if (left < -50) 763 left = -50; 764 if (left > 100) 765 left = 100; 766 right = ucontrol->value.integer.value[1]; 767 if (right < -50) 768 right = -50; 769 if (right > 100) 770 right = 100; 771 spin_lock_irq(&dummy->mixer_lock); 772 change = dummy->mixer_volume[addr][0] != left || 773 dummy->mixer_volume[addr][1] != right; 774 dummy->mixer_volume[addr][0] = left; 775 dummy->mixer_volume[addr][1] = right; 776 spin_unlock_irq(&dummy->mixer_lock); 777 return change; 778 } 779 780 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0); 781 782 #define DUMMY_CAPSRC(xname, xindex, addr) \ 783 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ 784 .info = snd_dummy_capsrc_info, \ 785 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \ 786 .private_value = addr } 787 788 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info 789 790 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol, 791 struct snd_ctl_elem_value *ucontrol) 792 { 793 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 794 int addr = kcontrol->private_value; 795 796 spin_lock_irq(&dummy->mixer_lock); 797 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0]; 798 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1]; 799 spin_unlock_irq(&dummy->mixer_lock); 800 return 0; 801 } 802 803 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 804 { 805 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 806 int change, addr = kcontrol->private_value; 807 int left, right; 808 809 left = ucontrol->value.integer.value[0] & 1; 810 right = ucontrol->value.integer.value[1] & 1; 811 spin_lock_irq(&dummy->mixer_lock); 812 change = dummy->capture_source[addr][0] != left && 813 dummy->capture_source[addr][1] != right; 814 dummy->capture_source[addr][0] = left; 815 dummy->capture_source[addr][1] = right; 816 spin_unlock_irq(&dummy->mixer_lock); 817 return change; 818 } 819 820 static struct snd_kcontrol_new snd_dummy_controls[] = { 821 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER), 822 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER), 823 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH), 824 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH), 825 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE), 826 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE), 827 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC), 828 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC), 829 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD), 830 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD) 831 }; 832 833 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy) 834 { 835 struct snd_card *card = dummy->card; 836 unsigned int idx; 837 int err; 838 839 spin_lock_init(&dummy->mixer_lock); 840 strcpy(card->mixername, "Dummy Mixer"); 841 842 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) { 843 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy)); 844 if (err < 0) 845 return err; 846 } 847 return 0; 848 } 849 850 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS) 851 /* 852 * proc interface 853 */ 854 static void print_formats(struct snd_dummy *dummy, 855 struct snd_info_buffer *buffer) 856 { 857 int i; 858 859 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) { 860 if (dummy->pcm_hw.formats & (1ULL << i)) 861 snd_iprintf(buffer, " %s", snd_pcm_format_name(i)); 862 } 863 } 864 865 static void print_rates(struct snd_dummy *dummy, 866 struct snd_info_buffer *buffer) 867 { 868 static int rates[] = { 869 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 870 64000, 88200, 96000, 176400, 192000, 871 }; 872 int i; 873 874 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS) 875 snd_iprintf(buffer, " continuous"); 876 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT) 877 snd_iprintf(buffer, " knot"); 878 for (i = 0; i < ARRAY_SIZE(rates); i++) 879 if (dummy->pcm_hw.rates & (1 << i)) 880 snd_iprintf(buffer, " %d", rates[i]); 881 } 882 883 #define get_dummy_int_ptr(dummy, ofs) \ 884 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs)) 885 #define get_dummy_ll_ptr(dummy, ofs) \ 886 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs)) 887 888 struct dummy_hw_field { 889 const char *name; 890 const char *format; 891 unsigned int offset; 892 unsigned int size; 893 }; 894 #define FIELD_ENTRY(item, fmt) { \ 895 .name = #item, \ 896 .format = fmt, \ 897 .offset = offsetof(struct snd_pcm_hardware, item), \ 898 .size = sizeof(dummy_pcm_hardware.item) } 899 900 static struct dummy_hw_field fields[] = { 901 FIELD_ENTRY(formats, "%#llx"), 902 FIELD_ENTRY(rates, "%#x"), 903 FIELD_ENTRY(rate_min, "%d"), 904 FIELD_ENTRY(rate_max, "%d"), 905 FIELD_ENTRY(channels_min, "%d"), 906 FIELD_ENTRY(channels_max, "%d"), 907 FIELD_ENTRY(buffer_bytes_max, "%ld"), 908 FIELD_ENTRY(period_bytes_min, "%ld"), 909 FIELD_ENTRY(period_bytes_max, "%ld"), 910 FIELD_ENTRY(periods_min, "%d"), 911 FIELD_ENTRY(periods_max, "%d"), 912 }; 913 914 static void dummy_proc_read(struct snd_info_entry *entry, 915 struct snd_info_buffer *buffer) 916 { 917 struct snd_dummy *dummy = entry->private_data; 918 int i; 919 920 for (i = 0; i < ARRAY_SIZE(fields); i++) { 921 snd_iprintf(buffer, "%s ", fields[i].name); 922 if (fields[i].size == sizeof(int)) 923 snd_iprintf(buffer, fields[i].format, 924 *get_dummy_int_ptr(dummy, fields[i].offset)); 925 else 926 snd_iprintf(buffer, fields[i].format, 927 *get_dummy_ll_ptr(dummy, fields[i].offset)); 928 if (!strcmp(fields[i].name, "formats")) 929 print_formats(dummy, buffer); 930 else if (!strcmp(fields[i].name, "rates")) 931 print_rates(dummy, buffer); 932 snd_iprintf(buffer, "\n"); 933 } 934 } 935 936 static void dummy_proc_write(struct snd_info_entry *entry, 937 struct snd_info_buffer *buffer) 938 { 939 struct snd_dummy *dummy = entry->private_data; 940 char line[64]; 941 942 while (!snd_info_get_line(buffer, line, sizeof(line))) { 943 char item[20]; 944 const char *ptr; 945 unsigned long long val; 946 int i; 947 948 ptr = snd_info_get_str(item, line, sizeof(item)); 949 for (i = 0; i < ARRAY_SIZE(fields); i++) { 950 if (!strcmp(item, fields[i].name)) 951 break; 952 } 953 if (i >= ARRAY_SIZE(fields)) 954 continue; 955 snd_info_get_str(item, ptr, sizeof(item)); 956 if (strict_strtoull(item, 0, &val)) 957 continue; 958 if (fields[i].size == sizeof(int)) 959 *get_dummy_int_ptr(dummy, fields[i].offset) = val; 960 else 961 *get_dummy_ll_ptr(dummy, fields[i].offset) = val; 962 } 963 } 964 965 static void __devinit dummy_proc_init(struct snd_dummy *chip) 966 { 967 struct snd_info_entry *entry; 968 969 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) { 970 snd_info_set_text_ops(entry, chip, dummy_proc_read); 971 entry->c.text.write = dummy_proc_write; 972 entry->mode |= S_IWUSR; 973 entry->private_data = chip; 974 } 975 } 976 #else 977 #define dummy_proc_init(x) 978 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */ 979 980 static int __devinit snd_dummy_probe(struct platform_device *devptr) 981 { 982 struct snd_card *card; 983 struct snd_dummy *dummy; 984 struct dummy_model *m = NULL, **mdl; 985 int idx, err; 986 int dev = devptr->id; 987 988 err = snd_card_create(index[dev], id[dev], THIS_MODULE, 989 sizeof(struct snd_dummy), &card); 990 if (err < 0) 991 return err; 992 dummy = card->private_data; 993 dummy->card = card; 994 for (mdl = dummy_models; *mdl && model[dev]; mdl++) { 995 if (strcmp(model[dev], (*mdl)->name) == 0) { 996 printk(KERN_INFO 997 "snd-dummy: Using model '%s' for card %i\n", 998 (*mdl)->name, card->number); 999 m = dummy->model = *mdl; 1000 break; 1001 } 1002 } 1003 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) { 1004 if (pcm_substreams[dev] < 1) 1005 pcm_substreams[dev] = 1; 1006 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) 1007 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; 1008 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]); 1009 if (err < 0) 1010 goto __nodev; 1011 } 1012 1013 dummy->pcm_hw = dummy_pcm_hardware; 1014 if (m) { 1015 if (m->formats) 1016 dummy->pcm_hw.formats = m->formats; 1017 if (m->buffer_bytes_max) 1018 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max; 1019 if (m->period_bytes_min) 1020 dummy->pcm_hw.period_bytes_min = m->period_bytes_min; 1021 if (m->period_bytes_max) 1022 dummy->pcm_hw.period_bytes_max = m->period_bytes_max; 1023 if (m->periods_min) 1024 dummy->pcm_hw.periods_min = m->periods_min; 1025 if (m->periods_max) 1026 dummy->pcm_hw.periods_max = m->periods_max; 1027 if (m->rates) 1028 dummy->pcm_hw.rates = m->rates; 1029 if (m->rate_min) 1030 dummy->pcm_hw.rate_min = m->rate_min; 1031 if (m->rate_max) 1032 dummy->pcm_hw.rate_max = m->rate_max; 1033 if (m->channels_min) 1034 dummy->pcm_hw.channels_min = m->channels_min; 1035 if (m->channels_max) 1036 dummy->pcm_hw.channels_max = m->channels_max; 1037 } 1038 1039 err = snd_card_dummy_new_mixer(dummy); 1040 if (err < 0) 1041 goto __nodev; 1042 strcpy(card->driver, "Dummy"); 1043 strcpy(card->shortname, "Dummy"); 1044 sprintf(card->longname, "Dummy %i", dev + 1); 1045 1046 dummy_proc_init(dummy); 1047 1048 snd_card_set_dev(card, &devptr->dev); 1049 1050 err = snd_card_register(card); 1051 if (err == 0) { 1052 platform_set_drvdata(devptr, card); 1053 return 0; 1054 } 1055 __nodev: 1056 snd_card_free(card); 1057 return err; 1058 } 1059 1060 static int __devexit snd_dummy_remove(struct platform_device *devptr) 1061 { 1062 snd_card_free(platform_get_drvdata(devptr)); 1063 platform_set_drvdata(devptr, NULL); 1064 return 0; 1065 } 1066 1067 #ifdef CONFIG_PM_SLEEP 1068 static int snd_dummy_suspend(struct device *pdev) 1069 { 1070 struct snd_card *card = dev_get_drvdata(pdev); 1071 struct snd_dummy *dummy = card->private_data; 1072 1073 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 1074 snd_pcm_suspend_all(dummy->pcm); 1075 return 0; 1076 } 1077 1078 static int snd_dummy_resume(struct device *pdev) 1079 { 1080 struct snd_card *card = dev_get_drvdata(pdev); 1081 1082 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 1083 return 0; 1084 } 1085 1086 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume); 1087 #define SND_DUMMY_PM_OPS &snd_dummy_pm 1088 #else 1089 #define SND_DUMMY_PM_OPS NULL 1090 #endif 1091 1092 #define SND_DUMMY_DRIVER "snd_dummy" 1093 1094 static struct platform_driver snd_dummy_driver = { 1095 .probe = snd_dummy_probe, 1096 .remove = __devexit_p(snd_dummy_remove), 1097 .driver = { 1098 .name = SND_DUMMY_DRIVER, 1099 .owner = THIS_MODULE, 1100 .pm = SND_DUMMY_PM_OPS, 1101 }, 1102 }; 1103 1104 static void snd_dummy_unregister_all(void) 1105 { 1106 int i; 1107 1108 for (i = 0; i < ARRAY_SIZE(devices); ++i) 1109 platform_device_unregister(devices[i]); 1110 platform_driver_unregister(&snd_dummy_driver); 1111 free_fake_buffer(); 1112 } 1113 1114 static int __init alsa_card_dummy_init(void) 1115 { 1116 int i, cards, err; 1117 1118 err = platform_driver_register(&snd_dummy_driver); 1119 if (err < 0) 1120 return err; 1121 1122 err = alloc_fake_buffer(); 1123 if (err < 0) { 1124 platform_driver_unregister(&snd_dummy_driver); 1125 return err; 1126 } 1127 1128 cards = 0; 1129 for (i = 0; i < SNDRV_CARDS; i++) { 1130 struct platform_device *device; 1131 if (! enable[i]) 1132 continue; 1133 device = platform_device_register_simple(SND_DUMMY_DRIVER, 1134 i, NULL, 0); 1135 if (IS_ERR(device)) 1136 continue; 1137 if (!platform_get_drvdata(device)) { 1138 platform_device_unregister(device); 1139 continue; 1140 } 1141 devices[i] = device; 1142 cards++; 1143 } 1144 if (!cards) { 1145 #ifdef MODULE 1146 printk(KERN_ERR "Dummy soundcard not found or device busy\n"); 1147 #endif 1148 snd_dummy_unregister_all(); 1149 return -ENODEV; 1150 } 1151 return 0; 1152 } 1153 1154 static void __exit alsa_card_dummy_exit(void) 1155 { 1156 snd_dummy_unregister_all(); 1157 } 1158 1159 module_init(alsa_card_dummy_init) 1160 module_exit(alsa_card_dummy_exit) 1161