1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Dummy soundcard 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7 #include <linux/init.h> 8 #include <linux/err.h> 9 #include <linux/platform_device.h> 10 #include <linux/jiffies.h> 11 #include <linux/slab.h> 12 #include <linux/time.h> 13 #include <linux/wait.h> 14 #include <linux/hrtimer.h> 15 #include <linux/math64.h> 16 #include <linux/module.h> 17 #include <sound/core.h> 18 #include <sound/control.h> 19 #include <sound/tlv.h> 20 #include <sound/pcm.h> 21 #include <sound/rawmidi.h> 22 #include <sound/info.h> 23 #include <sound/initval.h> 24 25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 26 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)"); 27 MODULE_LICENSE("GPL"); 28 29 #define MAX_PCM_DEVICES 4 30 #define MAX_PCM_SUBSTREAMS 128 31 #define MAX_MIDI_DEVICES 2 32 33 /* defaults */ 34 #define MAX_BUFFER_SIZE (64*1024) 35 #define MIN_PERIOD_SIZE 64 36 #define MAX_PERIOD_SIZE MAX_BUFFER_SIZE 37 #define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE) 38 #define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000 39 #define USE_RATE_MIN 5500 40 #define USE_RATE_MAX 48000 41 #define USE_CHANNELS_MIN 1 42 #define USE_CHANNELS_MAX 2 43 #define USE_PERIODS_MIN 1 44 #define USE_PERIODS_MAX 1024 45 46 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 47 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 48 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; 49 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL}; 50 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; 51 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; 52 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2}; 53 #ifdef CONFIG_HIGH_RES_TIMERS 54 static bool hrtimer = 1; 55 #endif 56 static bool fake_buffer = 1; 57 58 module_param_array(index, int, NULL, 0444); 59 MODULE_PARM_DESC(index, "Index value for dummy soundcard."); 60 module_param_array(id, charp, NULL, 0444); 61 MODULE_PARM_DESC(id, "ID string for dummy soundcard."); 62 module_param_array(enable, bool, NULL, 0444); 63 MODULE_PARM_DESC(enable, "Enable this dummy soundcard."); 64 module_param_array(model, charp, NULL, 0444); 65 MODULE_PARM_DESC(model, "Soundcard model."); 66 module_param_array(pcm_devs, int, NULL, 0444); 67 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver."); 68 module_param_array(pcm_substreams, int, NULL, 0444); 69 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver."); 70 //module_param_array(midi_devs, int, NULL, 0444); 71 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver."); 72 module_param(fake_buffer, bool, 0444); 73 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations."); 74 #ifdef CONFIG_HIGH_RES_TIMERS 75 module_param(hrtimer, bool, 0644); 76 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source."); 77 #endif 78 79 static struct platform_device *devices[SNDRV_CARDS]; 80 81 #define MIXER_ADDR_MASTER 0 82 #define MIXER_ADDR_LINE 1 83 #define MIXER_ADDR_MIC 2 84 #define MIXER_ADDR_SYNTH 3 85 #define MIXER_ADDR_CD 4 86 #define MIXER_ADDR_LAST 4 87 88 struct dummy_timer_ops { 89 int (*create)(struct snd_pcm_substream *); 90 void (*free)(struct snd_pcm_substream *); 91 int (*prepare)(struct snd_pcm_substream *); 92 int (*start)(struct snd_pcm_substream *); 93 int (*stop)(struct snd_pcm_substream *); 94 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *); 95 }; 96 97 #define get_dummy_ops(substream) \ 98 (*(const struct dummy_timer_ops **)(substream)->runtime->private_data) 99 100 struct dummy_model { 101 const char *name; 102 int (*playback_constraints)(struct snd_pcm_runtime *runtime); 103 int (*capture_constraints)(struct snd_pcm_runtime *runtime); 104 u64 formats; 105 size_t buffer_bytes_max; 106 size_t period_bytes_min; 107 size_t period_bytes_max; 108 unsigned int periods_min; 109 unsigned int periods_max; 110 unsigned int rates; 111 unsigned int rate_min; 112 unsigned int rate_max; 113 unsigned int channels_min; 114 unsigned int channels_max; 115 }; 116 117 struct snd_dummy { 118 struct snd_card *card; 119 const struct dummy_model *model; 120 struct snd_pcm *pcm; 121 struct snd_pcm_hardware pcm_hw; 122 spinlock_t mixer_lock; 123 int mixer_volume[MIXER_ADDR_LAST+1][2]; 124 int capture_source[MIXER_ADDR_LAST+1][2]; 125 int iobox; 126 struct snd_kcontrol *cd_volume_ctl; 127 struct snd_kcontrol *cd_switch_ctl; 128 }; 129 130 /* 131 * card models 132 */ 133 134 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime) 135 { 136 int err; 137 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 138 if (err < 0) 139 return err; 140 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX); 141 if (err < 0) 142 return err; 143 return 0; 144 } 145 146 static const struct dummy_model model_emu10k1 = { 147 .name = "emu10k1", 148 .playback_constraints = emu10k1_playback_constraints, 149 .buffer_bytes_max = 128 * 1024, 150 }; 151 152 static const struct dummy_model model_rme9652 = { 153 .name = "rme9652", 154 .buffer_bytes_max = 26 * 64 * 1024, 155 .formats = SNDRV_PCM_FMTBIT_S32_LE, 156 .channels_min = 26, 157 .channels_max = 26, 158 .periods_min = 2, 159 .periods_max = 2, 160 }; 161 162 static const struct dummy_model model_ice1712 = { 163 .name = "ice1712", 164 .buffer_bytes_max = 256 * 1024, 165 .formats = SNDRV_PCM_FMTBIT_S32_LE, 166 .channels_min = 10, 167 .channels_max = 10, 168 .periods_min = 1, 169 .periods_max = 1024, 170 }; 171 172 static const struct dummy_model model_uda1341 = { 173 .name = "uda1341", 174 .buffer_bytes_max = 16380, 175 .formats = SNDRV_PCM_FMTBIT_S16_LE, 176 .channels_min = 2, 177 .channels_max = 2, 178 .periods_min = 2, 179 .periods_max = 255, 180 }; 181 182 static const struct dummy_model model_ac97 = { 183 .name = "ac97", 184 .formats = SNDRV_PCM_FMTBIT_S16_LE, 185 .channels_min = 2, 186 .channels_max = 2, 187 .rates = SNDRV_PCM_RATE_48000, 188 .rate_min = 48000, 189 .rate_max = 48000, 190 }; 191 192 static const struct dummy_model model_ca0106 = { 193 .name = "ca0106", 194 .formats = SNDRV_PCM_FMTBIT_S16_LE, 195 .buffer_bytes_max = ((65536-64)*8), 196 .period_bytes_max = (65536-64), 197 .periods_min = 2, 198 .periods_max = 8, 199 .channels_min = 2, 200 .channels_max = 2, 201 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000, 202 .rate_min = 48000, 203 .rate_max = 192000, 204 }; 205 206 static const struct dummy_model *dummy_models[] = { 207 &model_emu10k1, 208 &model_rme9652, 209 &model_ice1712, 210 &model_uda1341, 211 &model_ac97, 212 &model_ca0106, 213 NULL 214 }; 215 216 /* 217 * system timer interface 218 */ 219 220 struct dummy_systimer_pcm { 221 /* ops must be the first item */ 222 const struct dummy_timer_ops *timer_ops; 223 spinlock_t lock; 224 struct timer_list timer; 225 unsigned long base_time; 226 unsigned int frac_pos; /* fractional sample position (based HZ) */ 227 unsigned int frac_period_rest; 228 unsigned int frac_buffer_size; /* buffer_size * HZ */ 229 unsigned int frac_period_size; /* period_size * HZ */ 230 unsigned int rate; 231 int elapsed; 232 struct snd_pcm_substream *substream; 233 }; 234 235 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm) 236 { 237 mod_timer(&dpcm->timer, jiffies + 238 DIV_ROUND_UP(dpcm->frac_period_rest, dpcm->rate)); 239 } 240 241 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm) 242 { 243 unsigned long delta; 244 245 delta = jiffies - dpcm->base_time; 246 if (!delta) 247 return; 248 dpcm->base_time += delta; 249 delta *= dpcm->rate; 250 dpcm->frac_pos += delta; 251 while (dpcm->frac_pos >= dpcm->frac_buffer_size) 252 dpcm->frac_pos -= dpcm->frac_buffer_size; 253 while (dpcm->frac_period_rest <= delta) { 254 dpcm->elapsed++; 255 dpcm->frac_period_rest += dpcm->frac_period_size; 256 } 257 dpcm->frac_period_rest -= delta; 258 } 259 260 static int dummy_systimer_start(struct snd_pcm_substream *substream) 261 { 262 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 263 spin_lock(&dpcm->lock); 264 dpcm->base_time = jiffies; 265 dummy_systimer_rearm(dpcm); 266 spin_unlock(&dpcm->lock); 267 return 0; 268 } 269 270 static int dummy_systimer_stop(struct snd_pcm_substream *substream) 271 { 272 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 273 spin_lock(&dpcm->lock); 274 del_timer(&dpcm->timer); 275 spin_unlock(&dpcm->lock); 276 return 0; 277 } 278 279 static int dummy_systimer_prepare(struct snd_pcm_substream *substream) 280 { 281 struct snd_pcm_runtime *runtime = substream->runtime; 282 struct dummy_systimer_pcm *dpcm = runtime->private_data; 283 284 dpcm->frac_pos = 0; 285 dpcm->rate = runtime->rate; 286 dpcm->frac_buffer_size = runtime->buffer_size * HZ; 287 dpcm->frac_period_size = runtime->period_size * HZ; 288 dpcm->frac_period_rest = dpcm->frac_period_size; 289 dpcm->elapsed = 0; 290 291 return 0; 292 } 293 294 static void dummy_systimer_callback(struct timer_list *t) 295 { 296 struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer); 297 unsigned long flags; 298 int elapsed = 0; 299 300 spin_lock_irqsave(&dpcm->lock, flags); 301 dummy_systimer_update(dpcm); 302 dummy_systimer_rearm(dpcm); 303 elapsed = dpcm->elapsed; 304 dpcm->elapsed = 0; 305 spin_unlock_irqrestore(&dpcm->lock, flags); 306 if (elapsed) 307 snd_pcm_period_elapsed(dpcm->substream); 308 } 309 310 static snd_pcm_uframes_t 311 dummy_systimer_pointer(struct snd_pcm_substream *substream) 312 { 313 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 314 snd_pcm_uframes_t pos; 315 316 spin_lock(&dpcm->lock); 317 dummy_systimer_update(dpcm); 318 pos = dpcm->frac_pos / HZ; 319 spin_unlock(&dpcm->lock); 320 return pos; 321 } 322 323 static int dummy_systimer_create(struct snd_pcm_substream *substream) 324 { 325 struct dummy_systimer_pcm *dpcm; 326 327 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 328 if (!dpcm) 329 return -ENOMEM; 330 substream->runtime->private_data = dpcm; 331 timer_setup(&dpcm->timer, dummy_systimer_callback, 0); 332 spin_lock_init(&dpcm->lock); 333 dpcm->substream = substream; 334 return 0; 335 } 336 337 static void dummy_systimer_free(struct snd_pcm_substream *substream) 338 { 339 kfree(substream->runtime->private_data); 340 } 341 342 static const struct dummy_timer_ops dummy_systimer_ops = { 343 .create = dummy_systimer_create, 344 .free = dummy_systimer_free, 345 .prepare = dummy_systimer_prepare, 346 .start = dummy_systimer_start, 347 .stop = dummy_systimer_stop, 348 .pointer = dummy_systimer_pointer, 349 }; 350 351 #ifdef CONFIG_HIGH_RES_TIMERS 352 /* 353 * hrtimer interface 354 */ 355 356 struct dummy_hrtimer_pcm { 357 /* ops must be the first item */ 358 const struct dummy_timer_ops *timer_ops; 359 ktime_t base_time; 360 ktime_t period_time; 361 atomic_t running; 362 struct hrtimer timer; 363 struct snd_pcm_substream *substream; 364 }; 365 366 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer) 367 { 368 struct dummy_hrtimer_pcm *dpcm; 369 370 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer); 371 if (!atomic_read(&dpcm->running)) 372 return HRTIMER_NORESTART; 373 /* 374 * In cases of XRUN and draining, this calls .trigger to stop PCM 375 * substream. 376 */ 377 snd_pcm_period_elapsed(dpcm->substream); 378 if (!atomic_read(&dpcm->running)) 379 return HRTIMER_NORESTART; 380 381 hrtimer_forward_now(timer, dpcm->period_time); 382 return HRTIMER_RESTART; 383 } 384 385 static int dummy_hrtimer_start(struct snd_pcm_substream *substream) 386 { 387 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 388 389 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer); 390 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT); 391 atomic_set(&dpcm->running, 1); 392 return 0; 393 } 394 395 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream) 396 { 397 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 398 399 atomic_set(&dpcm->running, 0); 400 if (!hrtimer_callback_running(&dpcm->timer)) 401 hrtimer_cancel(&dpcm->timer); 402 return 0; 403 } 404 405 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm) 406 { 407 hrtimer_cancel(&dpcm->timer); 408 } 409 410 static snd_pcm_uframes_t 411 dummy_hrtimer_pointer(struct snd_pcm_substream *substream) 412 { 413 struct snd_pcm_runtime *runtime = substream->runtime; 414 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 415 u64 delta; 416 u32 pos; 417 418 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer), 419 dpcm->base_time); 420 delta = div_u64(delta * runtime->rate + 999999, 1000000); 421 div_u64_rem(delta, runtime->buffer_size, &pos); 422 return pos; 423 } 424 425 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream) 426 { 427 struct snd_pcm_runtime *runtime = substream->runtime; 428 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 429 unsigned int period, rate; 430 long sec; 431 unsigned long nsecs; 432 433 dummy_hrtimer_sync(dpcm); 434 period = runtime->period_size; 435 rate = runtime->rate; 436 sec = period / rate; 437 period %= rate; 438 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate); 439 dpcm->period_time = ktime_set(sec, nsecs); 440 441 return 0; 442 } 443 444 static int dummy_hrtimer_create(struct snd_pcm_substream *substream) 445 { 446 struct dummy_hrtimer_pcm *dpcm; 447 448 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 449 if (!dpcm) 450 return -ENOMEM; 451 substream->runtime->private_data = dpcm; 452 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); 453 dpcm->timer.function = dummy_hrtimer_callback; 454 dpcm->substream = substream; 455 atomic_set(&dpcm->running, 0); 456 return 0; 457 } 458 459 static void dummy_hrtimer_free(struct snd_pcm_substream *substream) 460 { 461 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 462 dummy_hrtimer_sync(dpcm); 463 kfree(dpcm); 464 } 465 466 static const struct dummy_timer_ops dummy_hrtimer_ops = { 467 .create = dummy_hrtimer_create, 468 .free = dummy_hrtimer_free, 469 .prepare = dummy_hrtimer_prepare, 470 .start = dummy_hrtimer_start, 471 .stop = dummy_hrtimer_stop, 472 .pointer = dummy_hrtimer_pointer, 473 }; 474 475 #endif /* CONFIG_HIGH_RES_TIMERS */ 476 477 /* 478 * PCM interface 479 */ 480 481 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 482 { 483 switch (cmd) { 484 case SNDRV_PCM_TRIGGER_START: 485 case SNDRV_PCM_TRIGGER_RESUME: 486 return get_dummy_ops(substream)->start(substream); 487 case SNDRV_PCM_TRIGGER_STOP: 488 case SNDRV_PCM_TRIGGER_SUSPEND: 489 return get_dummy_ops(substream)->stop(substream); 490 } 491 return -EINVAL; 492 } 493 494 static int dummy_pcm_prepare(struct snd_pcm_substream *substream) 495 { 496 return get_dummy_ops(substream)->prepare(substream); 497 } 498 499 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream) 500 { 501 return get_dummy_ops(substream)->pointer(substream); 502 } 503 504 static const struct snd_pcm_hardware dummy_pcm_hardware = { 505 .info = (SNDRV_PCM_INFO_MMAP | 506 SNDRV_PCM_INFO_INTERLEAVED | 507 SNDRV_PCM_INFO_RESUME | 508 SNDRV_PCM_INFO_MMAP_VALID), 509 .formats = USE_FORMATS, 510 .rates = USE_RATE, 511 .rate_min = USE_RATE_MIN, 512 .rate_max = USE_RATE_MAX, 513 .channels_min = USE_CHANNELS_MIN, 514 .channels_max = USE_CHANNELS_MAX, 515 .buffer_bytes_max = MAX_BUFFER_SIZE, 516 .period_bytes_min = MIN_PERIOD_SIZE, 517 .period_bytes_max = MAX_PERIOD_SIZE, 518 .periods_min = USE_PERIODS_MIN, 519 .periods_max = USE_PERIODS_MAX, 520 .fifo_size = 0, 521 }; 522 523 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream, 524 struct snd_pcm_hw_params *hw_params) 525 { 526 if (fake_buffer) { 527 /* runtime->dma_bytes has to be set manually to allow mmap */ 528 substream->runtime->dma_bytes = params_buffer_bytes(hw_params); 529 return 0; 530 } 531 return 0; 532 } 533 534 static int dummy_pcm_open(struct snd_pcm_substream *substream) 535 { 536 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 537 const struct dummy_model *model = dummy->model; 538 struct snd_pcm_runtime *runtime = substream->runtime; 539 const struct dummy_timer_ops *ops; 540 int err; 541 542 ops = &dummy_systimer_ops; 543 #ifdef CONFIG_HIGH_RES_TIMERS 544 if (hrtimer) 545 ops = &dummy_hrtimer_ops; 546 #endif 547 548 err = ops->create(substream); 549 if (err < 0) 550 return err; 551 get_dummy_ops(substream) = ops; 552 553 runtime->hw = dummy->pcm_hw; 554 if (substream->pcm->device & 1) { 555 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED; 556 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED; 557 } 558 if (substream->pcm->device & 2) 559 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP | 560 SNDRV_PCM_INFO_MMAP_VALID); 561 562 if (model == NULL) 563 return 0; 564 565 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 566 if (model->playback_constraints) 567 err = model->playback_constraints(substream->runtime); 568 } else { 569 if (model->capture_constraints) 570 err = model->capture_constraints(substream->runtime); 571 } 572 if (err < 0) { 573 get_dummy_ops(substream)->free(substream); 574 return err; 575 } 576 return 0; 577 } 578 579 static int dummy_pcm_close(struct snd_pcm_substream *substream) 580 { 581 get_dummy_ops(substream)->free(substream); 582 return 0; 583 } 584 585 /* 586 * dummy buffer handling 587 */ 588 589 static void *dummy_page[2]; 590 591 static void free_fake_buffer(void) 592 { 593 if (fake_buffer) { 594 int i; 595 for (i = 0; i < 2; i++) 596 if (dummy_page[i]) { 597 free_page((unsigned long)dummy_page[i]); 598 dummy_page[i] = NULL; 599 } 600 } 601 } 602 603 static int alloc_fake_buffer(void) 604 { 605 int i; 606 607 if (!fake_buffer) 608 return 0; 609 for (i = 0; i < 2; i++) { 610 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL); 611 if (!dummy_page[i]) { 612 free_fake_buffer(); 613 return -ENOMEM; 614 } 615 } 616 return 0; 617 } 618 619 static int dummy_pcm_copy(struct snd_pcm_substream *substream, 620 int channel, unsigned long pos, 621 void __user *dst, unsigned long bytes) 622 { 623 return 0; /* do nothing */ 624 } 625 626 static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream, 627 int channel, unsigned long pos, 628 void *dst, unsigned long bytes) 629 { 630 return 0; /* do nothing */ 631 } 632 633 static int dummy_pcm_silence(struct snd_pcm_substream *substream, 634 int channel, unsigned long pos, 635 unsigned long bytes) 636 { 637 return 0; /* do nothing */ 638 } 639 640 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream, 641 unsigned long offset) 642 { 643 return virt_to_page(dummy_page[substream->stream]); /* the same page */ 644 } 645 646 static const struct snd_pcm_ops dummy_pcm_ops = { 647 .open = dummy_pcm_open, 648 .close = dummy_pcm_close, 649 .hw_params = dummy_pcm_hw_params, 650 .prepare = dummy_pcm_prepare, 651 .trigger = dummy_pcm_trigger, 652 .pointer = dummy_pcm_pointer, 653 }; 654 655 static const struct snd_pcm_ops dummy_pcm_ops_no_buf = { 656 .open = dummy_pcm_open, 657 .close = dummy_pcm_close, 658 .hw_params = dummy_pcm_hw_params, 659 .prepare = dummy_pcm_prepare, 660 .trigger = dummy_pcm_trigger, 661 .pointer = dummy_pcm_pointer, 662 .copy_user = dummy_pcm_copy, 663 .copy_kernel = dummy_pcm_copy_kernel, 664 .fill_silence = dummy_pcm_silence, 665 .page = dummy_pcm_page, 666 }; 667 668 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device, 669 int substreams) 670 { 671 struct snd_pcm *pcm; 672 const struct snd_pcm_ops *ops; 673 int err; 674 675 err = snd_pcm_new(dummy->card, "Dummy PCM", device, 676 substreams, substreams, &pcm); 677 if (err < 0) 678 return err; 679 dummy->pcm = pcm; 680 if (fake_buffer) 681 ops = &dummy_pcm_ops_no_buf; 682 else 683 ops = &dummy_pcm_ops; 684 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops); 685 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops); 686 pcm->private_data = dummy; 687 pcm->info_flags = 0; 688 strcpy(pcm->name, "Dummy PCM"); 689 if (!fake_buffer) { 690 snd_pcm_set_managed_buffer_all(pcm, 691 SNDRV_DMA_TYPE_CONTINUOUS, 692 NULL, 693 0, 64*1024); 694 } 695 return 0; 696 } 697 698 /* 699 * mixer interface 700 */ 701 702 #define DUMMY_VOLUME(xname, xindex, addr) \ 703 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 704 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \ 705 .name = xname, .index = xindex, \ 706 .info = snd_dummy_volume_info, \ 707 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \ 708 .private_value = addr, \ 709 .tlv = { .p = db_scale_dummy } } 710 711 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol, 712 struct snd_ctl_elem_info *uinfo) 713 { 714 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 715 uinfo->count = 2; 716 uinfo->value.integer.min = -50; 717 uinfo->value.integer.max = 100; 718 return 0; 719 } 720 721 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol, 722 struct snd_ctl_elem_value *ucontrol) 723 { 724 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 725 int addr = kcontrol->private_value; 726 727 spin_lock_irq(&dummy->mixer_lock); 728 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0]; 729 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1]; 730 spin_unlock_irq(&dummy->mixer_lock); 731 return 0; 732 } 733 734 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol, 735 struct snd_ctl_elem_value *ucontrol) 736 { 737 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 738 int change, addr = kcontrol->private_value; 739 int left, right; 740 741 left = ucontrol->value.integer.value[0]; 742 if (left < -50) 743 left = -50; 744 if (left > 100) 745 left = 100; 746 right = ucontrol->value.integer.value[1]; 747 if (right < -50) 748 right = -50; 749 if (right > 100) 750 right = 100; 751 spin_lock_irq(&dummy->mixer_lock); 752 change = dummy->mixer_volume[addr][0] != left || 753 dummy->mixer_volume[addr][1] != right; 754 dummy->mixer_volume[addr][0] = left; 755 dummy->mixer_volume[addr][1] = right; 756 spin_unlock_irq(&dummy->mixer_lock); 757 return change; 758 } 759 760 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0); 761 762 #define DUMMY_CAPSRC(xname, xindex, addr) \ 763 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ 764 .info = snd_dummy_capsrc_info, \ 765 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \ 766 .private_value = addr } 767 768 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info 769 770 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol, 771 struct snd_ctl_elem_value *ucontrol) 772 { 773 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 774 int addr = kcontrol->private_value; 775 776 spin_lock_irq(&dummy->mixer_lock); 777 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0]; 778 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1]; 779 spin_unlock_irq(&dummy->mixer_lock); 780 return 0; 781 } 782 783 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 784 { 785 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 786 int change, addr = kcontrol->private_value; 787 int left, right; 788 789 left = ucontrol->value.integer.value[0] & 1; 790 right = ucontrol->value.integer.value[1] & 1; 791 spin_lock_irq(&dummy->mixer_lock); 792 change = dummy->capture_source[addr][0] != left && 793 dummy->capture_source[addr][1] != right; 794 dummy->capture_source[addr][0] = left; 795 dummy->capture_source[addr][1] = right; 796 spin_unlock_irq(&dummy->mixer_lock); 797 return change; 798 } 799 800 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol, 801 struct snd_ctl_elem_info *info) 802 { 803 static const char *const names[] = { "None", "CD Player" }; 804 805 return snd_ctl_enum_info(info, 1, 2, names); 806 } 807 808 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol, 809 struct snd_ctl_elem_value *value) 810 { 811 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 812 813 value->value.enumerated.item[0] = dummy->iobox; 814 return 0; 815 } 816 817 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol, 818 struct snd_ctl_elem_value *value) 819 { 820 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 821 int changed; 822 823 if (value->value.enumerated.item[0] > 1) 824 return -EINVAL; 825 826 changed = value->value.enumerated.item[0] != dummy->iobox; 827 if (changed) { 828 dummy->iobox = value->value.enumerated.item[0]; 829 830 if (dummy->iobox) { 831 dummy->cd_volume_ctl->vd[0].access &= 832 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; 833 dummy->cd_switch_ctl->vd[0].access &= 834 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; 835 } else { 836 dummy->cd_volume_ctl->vd[0].access |= 837 SNDRV_CTL_ELEM_ACCESS_INACTIVE; 838 dummy->cd_switch_ctl->vd[0].access |= 839 SNDRV_CTL_ELEM_ACCESS_INACTIVE; 840 } 841 842 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO, 843 &dummy->cd_volume_ctl->id); 844 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO, 845 &dummy->cd_switch_ctl->id); 846 } 847 848 return changed; 849 } 850 851 static const struct snd_kcontrol_new snd_dummy_controls[] = { 852 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER), 853 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER), 854 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH), 855 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH), 856 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE), 857 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE), 858 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC), 859 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC), 860 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD), 861 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD), 862 { 863 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 864 .name = "External I/O Box", 865 .info = snd_dummy_iobox_info, 866 .get = snd_dummy_iobox_get, 867 .put = snd_dummy_iobox_put, 868 }, 869 }; 870 871 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy) 872 { 873 struct snd_card *card = dummy->card; 874 struct snd_kcontrol *kcontrol; 875 unsigned int idx; 876 int err; 877 878 spin_lock_init(&dummy->mixer_lock); 879 strcpy(card->mixername, "Dummy Mixer"); 880 dummy->iobox = 1; 881 882 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) { 883 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy); 884 err = snd_ctl_add(card, kcontrol); 885 if (err < 0) 886 return err; 887 if (!strcmp(kcontrol->id.name, "CD Volume")) 888 dummy->cd_volume_ctl = kcontrol; 889 else if (!strcmp(kcontrol->id.name, "CD Capture Switch")) 890 dummy->cd_switch_ctl = kcontrol; 891 892 } 893 return 0; 894 } 895 896 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS) 897 /* 898 * proc interface 899 */ 900 static void print_formats(struct snd_dummy *dummy, 901 struct snd_info_buffer *buffer) 902 { 903 snd_pcm_format_t i; 904 905 pcm_for_each_format(i) { 906 if (dummy->pcm_hw.formats & pcm_format_to_bits(i)) 907 snd_iprintf(buffer, " %s", snd_pcm_format_name(i)); 908 } 909 } 910 911 static void print_rates(struct snd_dummy *dummy, 912 struct snd_info_buffer *buffer) 913 { 914 static const int rates[] = { 915 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 916 64000, 88200, 96000, 176400, 192000, 917 }; 918 int i; 919 920 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS) 921 snd_iprintf(buffer, " continuous"); 922 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT) 923 snd_iprintf(buffer, " knot"); 924 for (i = 0; i < ARRAY_SIZE(rates); i++) 925 if (dummy->pcm_hw.rates & (1 << i)) 926 snd_iprintf(buffer, " %d", rates[i]); 927 } 928 929 #define get_dummy_int_ptr(dummy, ofs) \ 930 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs)) 931 #define get_dummy_ll_ptr(dummy, ofs) \ 932 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs)) 933 934 struct dummy_hw_field { 935 const char *name; 936 const char *format; 937 unsigned int offset; 938 unsigned int size; 939 }; 940 #define FIELD_ENTRY(item, fmt) { \ 941 .name = #item, \ 942 .format = fmt, \ 943 .offset = offsetof(struct snd_pcm_hardware, item), \ 944 .size = sizeof(dummy_pcm_hardware.item) } 945 946 static const struct dummy_hw_field fields[] = { 947 FIELD_ENTRY(formats, "%#llx"), 948 FIELD_ENTRY(rates, "%#x"), 949 FIELD_ENTRY(rate_min, "%d"), 950 FIELD_ENTRY(rate_max, "%d"), 951 FIELD_ENTRY(channels_min, "%d"), 952 FIELD_ENTRY(channels_max, "%d"), 953 FIELD_ENTRY(buffer_bytes_max, "%ld"), 954 FIELD_ENTRY(period_bytes_min, "%ld"), 955 FIELD_ENTRY(period_bytes_max, "%ld"), 956 FIELD_ENTRY(periods_min, "%d"), 957 FIELD_ENTRY(periods_max, "%d"), 958 }; 959 960 static void dummy_proc_read(struct snd_info_entry *entry, 961 struct snd_info_buffer *buffer) 962 { 963 struct snd_dummy *dummy = entry->private_data; 964 int i; 965 966 for (i = 0; i < ARRAY_SIZE(fields); i++) { 967 snd_iprintf(buffer, "%s ", fields[i].name); 968 if (fields[i].size == sizeof(int)) 969 snd_iprintf(buffer, fields[i].format, 970 *get_dummy_int_ptr(dummy, fields[i].offset)); 971 else 972 snd_iprintf(buffer, fields[i].format, 973 *get_dummy_ll_ptr(dummy, fields[i].offset)); 974 if (!strcmp(fields[i].name, "formats")) 975 print_formats(dummy, buffer); 976 else if (!strcmp(fields[i].name, "rates")) 977 print_rates(dummy, buffer); 978 snd_iprintf(buffer, "\n"); 979 } 980 } 981 982 static void dummy_proc_write(struct snd_info_entry *entry, 983 struct snd_info_buffer *buffer) 984 { 985 struct snd_dummy *dummy = entry->private_data; 986 char line[64]; 987 988 while (!snd_info_get_line(buffer, line, sizeof(line))) { 989 char item[20]; 990 const char *ptr; 991 unsigned long long val; 992 int i; 993 994 ptr = snd_info_get_str(item, line, sizeof(item)); 995 for (i = 0; i < ARRAY_SIZE(fields); i++) { 996 if (!strcmp(item, fields[i].name)) 997 break; 998 } 999 if (i >= ARRAY_SIZE(fields)) 1000 continue; 1001 snd_info_get_str(item, ptr, sizeof(item)); 1002 if (kstrtoull(item, 0, &val)) 1003 continue; 1004 if (fields[i].size == sizeof(int)) 1005 *get_dummy_int_ptr(dummy, fields[i].offset) = val; 1006 else 1007 *get_dummy_ll_ptr(dummy, fields[i].offset) = val; 1008 } 1009 } 1010 1011 static void dummy_proc_init(struct snd_dummy *chip) 1012 { 1013 snd_card_rw_proc_new(chip->card, "dummy_pcm", chip, 1014 dummy_proc_read, dummy_proc_write); 1015 } 1016 #else 1017 #define dummy_proc_init(x) 1018 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */ 1019 1020 static int snd_dummy_probe(struct platform_device *devptr) 1021 { 1022 struct snd_card *card; 1023 struct snd_dummy *dummy; 1024 const struct dummy_model *m = NULL, **mdl; 1025 int idx, err; 1026 int dev = devptr->id; 1027 1028 err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, 1029 sizeof(struct snd_dummy), &card); 1030 if (err < 0) 1031 return err; 1032 dummy = card->private_data; 1033 dummy->card = card; 1034 for (mdl = dummy_models; *mdl && model[dev]; mdl++) { 1035 if (strcmp(model[dev], (*mdl)->name) == 0) { 1036 printk(KERN_INFO 1037 "snd-dummy: Using model '%s' for card %i\n", 1038 (*mdl)->name, card->number); 1039 m = dummy->model = *mdl; 1040 break; 1041 } 1042 } 1043 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) { 1044 if (pcm_substreams[dev] < 1) 1045 pcm_substreams[dev] = 1; 1046 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) 1047 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; 1048 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]); 1049 if (err < 0) 1050 return err; 1051 } 1052 1053 dummy->pcm_hw = dummy_pcm_hardware; 1054 if (m) { 1055 if (m->formats) 1056 dummy->pcm_hw.formats = m->formats; 1057 if (m->buffer_bytes_max) 1058 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max; 1059 if (m->period_bytes_min) 1060 dummy->pcm_hw.period_bytes_min = m->period_bytes_min; 1061 if (m->period_bytes_max) 1062 dummy->pcm_hw.period_bytes_max = m->period_bytes_max; 1063 if (m->periods_min) 1064 dummy->pcm_hw.periods_min = m->periods_min; 1065 if (m->periods_max) 1066 dummy->pcm_hw.periods_max = m->periods_max; 1067 if (m->rates) 1068 dummy->pcm_hw.rates = m->rates; 1069 if (m->rate_min) 1070 dummy->pcm_hw.rate_min = m->rate_min; 1071 if (m->rate_max) 1072 dummy->pcm_hw.rate_max = m->rate_max; 1073 if (m->channels_min) 1074 dummy->pcm_hw.channels_min = m->channels_min; 1075 if (m->channels_max) 1076 dummy->pcm_hw.channels_max = m->channels_max; 1077 } 1078 1079 err = snd_card_dummy_new_mixer(dummy); 1080 if (err < 0) 1081 return err; 1082 strcpy(card->driver, "Dummy"); 1083 strcpy(card->shortname, "Dummy"); 1084 sprintf(card->longname, "Dummy %i", dev + 1); 1085 1086 dummy_proc_init(dummy); 1087 1088 err = snd_card_register(card); 1089 if (err < 0) 1090 return err; 1091 platform_set_drvdata(devptr, card); 1092 return 0; 1093 } 1094 1095 #ifdef CONFIG_PM_SLEEP 1096 static int snd_dummy_suspend(struct device *pdev) 1097 { 1098 struct snd_card *card = dev_get_drvdata(pdev); 1099 1100 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 1101 return 0; 1102 } 1103 1104 static int snd_dummy_resume(struct device *pdev) 1105 { 1106 struct snd_card *card = dev_get_drvdata(pdev); 1107 1108 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 1109 return 0; 1110 } 1111 1112 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume); 1113 #define SND_DUMMY_PM_OPS &snd_dummy_pm 1114 #else 1115 #define SND_DUMMY_PM_OPS NULL 1116 #endif 1117 1118 #define SND_DUMMY_DRIVER "snd_dummy" 1119 1120 static struct platform_driver snd_dummy_driver = { 1121 .probe = snd_dummy_probe, 1122 .driver = { 1123 .name = SND_DUMMY_DRIVER, 1124 .pm = SND_DUMMY_PM_OPS, 1125 }, 1126 }; 1127 1128 static void snd_dummy_unregister_all(void) 1129 { 1130 int i; 1131 1132 for (i = 0; i < ARRAY_SIZE(devices); ++i) 1133 platform_device_unregister(devices[i]); 1134 platform_driver_unregister(&snd_dummy_driver); 1135 free_fake_buffer(); 1136 } 1137 1138 static int __init alsa_card_dummy_init(void) 1139 { 1140 int i, cards, err; 1141 1142 err = platform_driver_register(&snd_dummy_driver); 1143 if (err < 0) 1144 return err; 1145 1146 err = alloc_fake_buffer(); 1147 if (err < 0) { 1148 platform_driver_unregister(&snd_dummy_driver); 1149 return err; 1150 } 1151 1152 cards = 0; 1153 for (i = 0; i < SNDRV_CARDS; i++) { 1154 struct platform_device *device; 1155 if (! enable[i]) 1156 continue; 1157 device = platform_device_register_simple(SND_DUMMY_DRIVER, 1158 i, NULL, 0); 1159 if (IS_ERR(device)) 1160 continue; 1161 if (!platform_get_drvdata(device)) { 1162 platform_device_unregister(device); 1163 continue; 1164 } 1165 devices[i] = device; 1166 cards++; 1167 } 1168 if (!cards) { 1169 #ifdef MODULE 1170 printk(KERN_ERR "Dummy soundcard not found or device busy\n"); 1171 #endif 1172 snd_dummy_unregister_all(); 1173 return -ENODEV; 1174 } 1175 return 0; 1176 } 1177 1178 static void __exit alsa_card_dummy_exit(void) 1179 { 1180 snd_dummy_unregister_all(); 1181 } 1182 1183 module_init(alsa_card_dummy_init) 1184 module_exit(alsa_card_dummy_exit) 1185