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dummy.c
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linux-6.19.14/sound/drivers/dummy.c
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/string.h> 13#include <linux/time.h> 14#include <linux/wait.h> 15#include <linux/hrtimer.h> 16#include <linux/math64.h> 17#include <linux/module.h> 18#include <sound/core.h> 19#include <sound/control.h> 20#include <sound/tlv.h> 21#include <sound/pcm.h> 22#include <sound/rawmidi.h> 23#include <sound/info.h> 24#include <sound/initval.h> 25 26MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 27MODULE_DESCRIPTION("Dummy soundcard (/dev/null)"); 28MODULE_LICENSE("GPL"); 29 30#define MAX_PCM_DEVICES 4 31#define MAX_PCM_SUBSTREAMS 128 32#define MAX_MIDI_DEVICES 2 33 34/* defaults */ 35#define MAX_BUFFER_SIZE (64*1024) 36#define MIN_PERIOD_SIZE 64 37#define MAX_PERIOD_SIZE MAX_BUFFER_SIZE 38#define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE) 39#define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000 40#define USE_RATE_MIN 5500 41#define USE_RATE_MAX 48000 42#define USE_CHANNELS_MIN 1 43#define USE_CHANNELS_MAX 2 44#define USE_PERIODS_MIN 1 45#define USE_PERIODS_MAX 1024 46#define USE_MIXER_VOLUME_LEVEL_MIN -50 47#define USE_MIXER_VOLUME_LEVEL_MAX 100 48 49static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 50static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 51static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; 52static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL}; 53static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; 54static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; 55//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2}; 56static int mixer_volume_level_min = USE_MIXER_VOLUME_LEVEL_MIN; 57static int mixer_volume_level_max = USE_MIXER_VOLUME_LEVEL_MAX; 58#ifdef CONFIG_HIGH_RES_TIMERS 59static bool hrtimer = 1; 60#endif 61static bool fake_buffer = 1; 62 63module_param_array(index, int, NULL, 0444); 64MODULE_PARM_DESC(index, "Index value for dummy soundcard."); 65module_param_array(id, charp, NULL, 0444); 66MODULE_PARM_DESC(id, "ID string for dummy soundcard."); 67module_param_array(enable, bool, NULL, 0444); 68MODULE_PARM_DESC(enable, "Enable this dummy soundcard."); 69module_param_array(model, charp, NULL, 0444); 70MODULE_PARM_DESC(model, "Soundcard model."); 71module_param_array(pcm_devs, int, NULL, 0444); 72MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver."); 73module_param_array(pcm_substreams, int, NULL, 0444); 74MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver."); 75//module_param_array(midi_devs, int, NULL, 0444); 76//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver."); 77module_param(mixer_volume_level_min, int, 0444); 78MODULE_PARM_DESC(mixer_volume_level_min, "Minimum mixer volume level for dummy driver. Default: -50"); 79module_param(mixer_volume_level_max, int, 0444); 80MODULE_PARM_DESC(mixer_volume_level_max, "Maximum mixer volume level for dummy driver. Default: 100"); 81module_param(fake_buffer, bool, 0444); 82MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations."); 83#ifdef CONFIG_HIGH_RES_TIMERS 84module_param(hrtimer, bool, 0644); 85MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source."); 86#endif 87 88static struct platform_device *devices[SNDRV_CARDS]; 89 90#define MIXER_ADDR_MASTER 0 91#define MIXER_ADDR_LINE 1 92#define MIXER_ADDR_MIC 2 93#define MIXER_ADDR_SYNTH 3 94#define MIXER_ADDR_CD 4 95#define MIXER_ADDR_LAST 4 96 97struct dummy_timer_ops { 98 int (*create)(struct snd_pcm_substream *); 99 void (*free)(struct snd_pcm_substream *); 100 int (*prepare)(struct snd_pcm_substream *); 101 int (*start)(struct snd_pcm_substream *); 102 int (*stop)(struct snd_pcm_substream *); 103 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *); 104}; 105 106#define get_dummy_ops(substream) \ 107 (*(const struct dummy_timer_ops **)(substream)->runtime->private_data) 108 109struct dummy_model { 110 const char *name; 111 int (*playback_constraints)(struct snd_pcm_runtime *runtime); 112 int (*capture_constraints)(struct snd_pcm_runtime *runtime); 113 u64 formats; 114 size_t buffer_bytes_max; 115 size_t period_bytes_min; 116 size_t period_bytes_max; 117 unsigned int periods_min; 118 unsigned int periods_max; 119 unsigned int rates; 120 unsigned int rate_min; 121 unsigned int rate_max; 122 unsigned int channels_min; 123 unsigned int channels_max; 124}; 125 126struct snd_dummy { 127 struct snd_card *card; 128 const struct dummy_model *model; 129 struct snd_pcm *pcm; 130 struct snd_pcm_hardware pcm_hw; 131 spinlock_t mixer_lock; 132 int mixer_volume[MIXER_ADDR_LAST+1][2]; 133 int capture_source[MIXER_ADDR_LAST+1][2]; 134 int iobox; 135 struct snd_kcontrol *cd_volume_ctl; 136 struct snd_kcontrol *cd_switch_ctl; 137}; 138 139/* 140 * card models 141 */ 142 143static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime) 144{ 145 int err; 146 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 147 if (err < 0) 148 return err; 149 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX); 150 if (err < 0) 151 return err; 152 return 0; 153} 154 155static const struct dummy_model model_emu10k1 = { 156 .name = "emu10k1", 157 .playback_constraints = emu10k1_playback_constraints, 158 .buffer_bytes_max = 128 * 1024, 159}; 160 161static const struct dummy_model model_rme9652 = { 162 .name = "rme9652", 163 .buffer_bytes_max = 26 * 64 * 1024, 164 .formats = SNDRV_PCM_FMTBIT_S32_LE, 165 .channels_min = 26, 166 .channels_max = 26, 167 .periods_min = 2, 168 .periods_max = 2, 169}; 170 171static const struct dummy_model model_ice1712 = { 172 .name = "ice1712", 173 .buffer_bytes_max = 256 * 1024, 174 .formats = SNDRV_PCM_FMTBIT_S32_LE, 175 .channels_min = 10, 176 .channels_max = 10, 177 .periods_min = 1, 178 .periods_max = 1024, 179}; 180 181static const struct dummy_model model_uda1341 = { 182 .name = "uda1341", 183 .buffer_bytes_max = 16380, 184 .formats = SNDRV_PCM_FMTBIT_S16_LE, 185 .channels_min = 2, 186 .channels_max = 2, 187 .periods_min = 2, 188 .periods_max = 255, 189}; 190 191static const struct dummy_model model_ac97 = { 192 .name = "ac97", 193 .formats = SNDRV_PCM_FMTBIT_S16_LE, 194 .channels_min = 2, 195 .channels_max = 2, 196 .rates = SNDRV_PCM_RATE_48000, 197 .rate_min = 48000, 198 .rate_max = 48000, 199}; 200 201static const struct dummy_model model_ca0106 = { 202 .name = "ca0106", 203 .formats = SNDRV_PCM_FMTBIT_S16_LE, 204 .buffer_bytes_max = ((65536-64)*8), 205 .period_bytes_max = (65536-64), 206 .periods_min = 2, 207 .periods_max = 8, 208 .channels_min = 2, 209 .channels_max = 2, 210 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000, 211 .rate_min = 48000, 212 .rate_max = 192000, 213}; 214 215static const struct dummy_model *dummy_models[] = { 216 &model_emu10k1, 217 &model_rme9652, 218 &model_ice1712, 219 &model_uda1341, 220 &model_ac97, 221 &model_ca0106, 222 NULL 223}; 224 225/* 226 * system timer interface 227 */ 228 229struct dummy_systimer_pcm { 230 /* ops must be the first item */ 231 const struct dummy_timer_ops *timer_ops; 232 spinlock_t lock; 233 struct timer_list timer; 234 unsigned long base_time; 235 unsigned int frac_pos; /* fractional sample position (based HZ) */ 236 unsigned int frac_period_rest; 237 unsigned int frac_buffer_size; /* buffer_size * HZ */ 238 unsigned int frac_period_size; /* period_size * HZ */ 239 unsigned int rate; 240 int elapsed; 241 struct snd_pcm_substream *substream; 242}; 243 244static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm) 245{ 246 mod_timer(&dpcm->timer, jiffies + 247 DIV_ROUND_UP(dpcm->frac_period_rest, dpcm->rate)); 248} 249 250static 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 269static int dummy_systimer_start(struct snd_pcm_substream *substream) 270{ 271 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 272 273 guard(spinlock)(&dpcm->lock); 274 dpcm->base_time = jiffies; 275 dummy_systimer_rearm(dpcm); 276 return 0; 277} 278 279static int dummy_systimer_stop(struct snd_pcm_substream *substream) 280{ 281 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 282 283 guard(spinlock)(&dpcm->lock); 284 timer_delete(&dpcm->timer); 285 return 0; 286} 287 288static 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 303static void dummy_systimer_callback(struct timer_list *t) 304{ 305 struct dummy_systimer_pcm *dpcm = timer_container_of(dpcm, t, timer); 306 int elapsed = 0; 307 308 scoped_guard(spinlock_irqsave, &dpcm->lock) { 309 dummy_systimer_update(dpcm); 310 dummy_systimer_rearm(dpcm); 311 elapsed = dpcm->elapsed; 312 dpcm->elapsed = 0; 313 } 314 if (elapsed) 315 snd_pcm_period_elapsed(dpcm->substream); 316} 317 318static snd_pcm_uframes_t 319dummy_systimer_pointer(struct snd_pcm_substream *substream) 320{ 321 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 322 323 guard(spinlock)(&dpcm->lock); 324 dummy_systimer_update(dpcm); 325 return dpcm->frac_pos / HZ; 326} 327 328static int dummy_systimer_create(struct snd_pcm_substream *substream) 329{ 330 struct dummy_systimer_pcm *dpcm; 331 332 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 333 if (!dpcm) 334 return -ENOMEM; 335 substream->runtime->private_data = dpcm; 336 timer_setup(&dpcm->timer, dummy_systimer_callback, 0); 337 spin_lock_init(&dpcm->lock); 338 dpcm->substream = substream; 339 return 0; 340} 341 342static void dummy_systimer_free(struct snd_pcm_substream *substream) 343{ 344 kfree(substream->runtime->private_data); 345} 346 347static const struct dummy_timer_ops dummy_systimer_ops = { 348 .create = dummy_systimer_create, 349 .free = dummy_systimer_free, 350 .prepare = dummy_systimer_prepare, 351 .start = dummy_systimer_start, 352 .stop = dummy_systimer_stop, 353 .pointer = dummy_systimer_pointer, 354}; 355 356#ifdef CONFIG_HIGH_RES_TIMERS 357/* 358 * hrtimer interface 359 */ 360 361struct dummy_hrtimer_pcm { 362 /* ops must be the first item */ 363 const struct dummy_timer_ops *timer_ops; 364 ktime_t base_time; 365 ktime_t period_time; 366 atomic_t running; 367 struct hrtimer timer; 368 struct snd_pcm_substream *substream; 369}; 370 371static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer) 372{ 373 struct dummy_hrtimer_pcm *dpcm; 374 375 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer); 376 if (!atomic_read(&dpcm->running)) 377 return HRTIMER_NORESTART; 378 /* 379 * In cases of XRUN and draining, this calls .trigger to stop PCM 380 * substream. 381 */ 382 snd_pcm_period_elapsed(dpcm->substream); 383 if (!atomic_read(&dpcm->running)) 384 return HRTIMER_NORESTART; 385 386 hrtimer_forward_now(timer, dpcm->period_time); 387 return HRTIMER_RESTART; 388} 389 390static int dummy_hrtimer_start(struct snd_pcm_substream *substream) 391{ 392 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 393 394 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer); 395 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT); 396 atomic_set(&dpcm->running, 1); 397 return 0; 398} 399 400static int dummy_hrtimer_stop(struct snd_pcm_substream *substream) 401{ 402 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 403 404 atomic_set(&dpcm->running, 0); 405 if (!hrtimer_callback_running(&dpcm->timer)) 406 hrtimer_cancel(&dpcm->timer); 407 return 0; 408} 409 410static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm) 411{ 412 hrtimer_cancel(&dpcm->timer); 413} 414 415static snd_pcm_uframes_t 416dummy_hrtimer_pointer(struct snd_pcm_substream *substream) 417{ 418 struct snd_pcm_runtime *runtime = substream->runtime; 419 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 420 u64 delta; 421 u32 pos; 422 423 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer), 424 dpcm->base_time); 425 delta = div_u64(delta * runtime->rate + 999999, 1000000); 426 div_u64_rem(delta, runtime->buffer_size, &pos); 427 return pos; 428} 429 430static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream) 431{ 432 struct snd_pcm_runtime *runtime = substream->runtime; 433 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 434 unsigned int period, rate; 435 long sec; 436 unsigned long nsecs; 437 438 dummy_hrtimer_sync(dpcm); 439 period = runtime->period_size; 440 rate = runtime->rate; 441 sec = period / rate; 442 period %= rate; 443 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate); 444 dpcm->period_time = ktime_set(sec, nsecs); 445 446 return 0; 447} 448 449static int dummy_hrtimer_create(struct snd_pcm_substream *substream) 450{ 451 struct dummy_hrtimer_pcm *dpcm; 452 453 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 454 if (!dpcm) 455 return -ENOMEM; 456 substream->runtime->private_data = dpcm; 457 hrtimer_setup(&dpcm->timer, dummy_hrtimer_callback, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); 458 dpcm->substream = substream; 459 atomic_set(&dpcm->running, 0); 460 return 0; 461} 462 463static void dummy_hrtimer_free(struct snd_pcm_substream *substream) 464{ 465 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 466 dummy_hrtimer_sync(dpcm); 467 kfree(dpcm); 468} 469 470static const struct dummy_timer_ops dummy_hrtimer_ops = { 471 .create = dummy_hrtimer_create, 472 .free = dummy_hrtimer_free, 473 .prepare = dummy_hrtimer_prepare, 474 .start = dummy_hrtimer_start, 475 .stop = dummy_hrtimer_stop, 476 .pointer = dummy_hrtimer_pointer, 477}; 478 479#endif /* CONFIG_HIGH_RES_TIMERS */ 480 481/* 482 * PCM interface 483 */ 484 485static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 486{ 487 switch (cmd) { 488 case SNDRV_PCM_TRIGGER_START: 489 case SNDRV_PCM_TRIGGER_RESUME: 490 return get_dummy_ops(substream)->start(substream); 491 case SNDRV_PCM_TRIGGER_STOP: 492 case SNDRV_PCM_TRIGGER_SUSPEND: 493 return get_dummy_ops(substream)->stop(substream); 494 } 495 return -EINVAL; 496} 497 498static int dummy_pcm_prepare(struct snd_pcm_substream *substream) 499{ 500 return get_dummy_ops(substream)->prepare(substream); 501} 502 503static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream) 504{ 505 return get_dummy_ops(substream)->pointer(substream); 506} 507 508static const struct snd_pcm_hardware dummy_pcm_hardware = { 509 .info = (SNDRV_PCM_INFO_MMAP | 510 SNDRV_PCM_INFO_INTERLEAVED | 511 SNDRV_PCM_INFO_RESUME | 512 SNDRV_PCM_INFO_MMAP_VALID), 513 .formats = USE_FORMATS, 514 .rates = USE_RATE, 515 .rate_min = USE_RATE_MIN, 516 .rate_max = USE_RATE_MAX, 517 .channels_min = USE_CHANNELS_MIN, 518 .channels_max = USE_CHANNELS_MAX, 519 .buffer_bytes_max = MAX_BUFFER_SIZE, 520 .period_bytes_min = MIN_PERIOD_SIZE, 521 .period_bytes_max = MAX_PERIOD_SIZE, 522 .periods_min = USE_PERIODS_MIN, 523 .periods_max = USE_PERIODS_MAX, 524 .fifo_size = 0, 525}; 526 527static int dummy_pcm_hw_params(struct snd_pcm_substream *substream, 528 struct snd_pcm_hw_params *hw_params) 529{ 530 if (fake_buffer) { 531 /* runtime->dma_bytes has to be set manually to allow mmap */ 532 substream->runtime->dma_bytes = params_buffer_bytes(hw_params); 533 return 0; 534 } 535 return 0; 536} 537 538static int dummy_pcm_open(struct snd_pcm_substream *substream) 539{ 540 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 541 const struct dummy_model *model = dummy->model; 542 struct snd_pcm_runtime *runtime = substream->runtime; 543 const struct dummy_timer_ops *ops; 544 int err; 545 546 ops = &dummy_systimer_ops; 547#ifdef CONFIG_HIGH_RES_TIMERS 548 if (hrtimer) 549 ops = &dummy_hrtimer_ops; 550#endif 551 552 err = ops->create(substream); 553 if (err < 0) 554 return err; 555 get_dummy_ops(substream) = ops; 556 557 runtime->hw = dummy->pcm_hw; 558 if (substream->pcm->device & 1) { 559 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED; 560 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED; 561 } 562 if (substream->pcm->device & 2) 563 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP | 564 SNDRV_PCM_INFO_MMAP_VALID); 565 566 if (model == NULL) 567 return 0; 568 569 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 570 if (model->playback_constraints) 571 err = model->playback_constraints(substream->runtime); 572 } else { 573 if (model->capture_constraints) 574 err = model->capture_constraints(substream->runtime); 575 } 576 if (err < 0) { 577 get_dummy_ops(substream)->free(substream); 578 return err; 579 } 580 return 0; 581} 582 583static int dummy_pcm_close(struct snd_pcm_substream *substream) 584{ 585 get_dummy_ops(substream)->free(substream); 586 return 0; 587} 588 589/* 590 * dummy buffer handling 591 */ 592 593static void *dummy_page[2]; 594 595static void free_fake_buffer(void) 596{ 597 if (fake_buffer) { 598 int i; 599 for (i = 0; i < 2; i++) 600 if (dummy_page[i]) { 601 free_page((unsigned long)dummy_page[i]); 602 dummy_page[i] = NULL; 603 } 604 } 605} 606 607static int alloc_fake_buffer(void) 608{ 609 int i; 610 611 if (!fake_buffer) 612 return 0; 613 for (i = 0; i < 2; i++) { 614 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL); 615 if (!dummy_page[i]) { 616 free_fake_buffer(); 617 return -ENOMEM; 618 } 619 } 620 return 0; 621} 622 623static int dummy_pcm_copy(struct snd_pcm_substream *substream, 624 int channel, unsigned long pos, 625 struct iov_iter *iter, unsigned long bytes) 626{ 627 return 0; /* do nothing */ 628} 629 630static int dummy_pcm_silence(struct snd_pcm_substream *substream, 631 int channel, unsigned long pos, 632 unsigned long bytes) 633{ 634 return 0; /* do nothing */ 635} 636 637static struct page *dummy_pcm_page(struct snd_pcm_substream *substream, 638 unsigned long offset) 639{ 640 return virt_to_page(dummy_page[substream->stream]); /* the same page */ 641} 642 643static const struct snd_pcm_ops dummy_pcm_ops = { 644 .open = dummy_pcm_open, 645 .close = dummy_pcm_close, 646 .hw_params = dummy_pcm_hw_params, 647 .prepare = dummy_pcm_prepare, 648 .trigger = dummy_pcm_trigger, 649 .pointer = dummy_pcm_pointer, 650}; 651 652static const struct snd_pcm_ops dummy_pcm_ops_no_buf = { 653 .open = dummy_pcm_open, 654 .close = dummy_pcm_close, 655 .hw_params = dummy_pcm_hw_params, 656 .prepare = dummy_pcm_prepare, 657 .trigger = dummy_pcm_trigger, 658 .pointer = dummy_pcm_pointer, 659 .copy = dummy_pcm_copy, 660 .fill_silence = dummy_pcm_silence, 661 .page = dummy_pcm_page, 662}; 663 664static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device, 665 int substreams) 666{ 667 struct snd_pcm *pcm; 668 const struct snd_pcm_ops *ops; 669 int err; 670 671 err = snd_pcm_new(dummy->card, "Dummy PCM", device, 672 substreams, substreams, &pcm); 673 if (err < 0) 674 return err; 675 dummy->pcm = pcm; 676 if (fake_buffer) 677 ops = &dummy_pcm_ops_no_buf; 678 else 679 ops = &dummy_pcm_ops; 680 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops); 681 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops); 682 pcm->private_data = dummy; 683 pcm->info_flags = 0; 684 strscpy(pcm->name, "Dummy PCM"); 685 if (!fake_buffer) { 686 snd_pcm_set_managed_buffer_all(pcm, 687 SNDRV_DMA_TYPE_CONTINUOUS, 688 NULL, 689 0, 64*1024); 690 } 691 return 0; 692} 693 694/* 695 * mixer interface 696 */ 697 698#define DUMMY_VOLUME(xname, xindex, addr) \ 699{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 700 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \ 701 .name = xname, .index = xindex, \ 702 .info = snd_dummy_volume_info, \ 703 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \ 704 .private_value = addr, \ 705 .tlv = { .p = db_scale_dummy } } 706 707static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol, 708 struct snd_ctl_elem_info *uinfo) 709{ 710 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 711 uinfo->count = 2; 712 uinfo->value.integer.min = mixer_volume_level_min; 713 uinfo->value.integer.max = mixer_volume_level_max; 714 return 0; 715} 716 717static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol, 718 struct snd_ctl_elem_value *ucontrol) 719{ 720 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 721 int addr = kcontrol->private_value; 722 723 guard(spinlock_irq)(&dummy->mixer_lock); 724 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0]; 725 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1]; 726 return 0; 727} 728 729static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol, 730 struct snd_ctl_elem_value *ucontrol) 731{ 732 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 733 int change, addr = kcontrol->private_value; 734 int left, right; 735 736 left = ucontrol->value.integer.value[0]; 737 if (left < mixer_volume_level_min) 738 left = mixer_volume_level_min; 739 if (left > mixer_volume_level_max) 740 left = mixer_volume_level_max; 741 right = ucontrol->value.integer.value[1]; 742 if (right < mixer_volume_level_min) 743 right = mixer_volume_level_min; 744 if (right > mixer_volume_level_max) 745 right = mixer_volume_level_max; 746 guard(spinlock_irq)(&dummy->mixer_lock); 747 change = dummy->mixer_volume[addr][0] != left || 748 dummy->mixer_volume[addr][1] != right; 749 dummy->mixer_volume[addr][0] = left; 750 dummy->mixer_volume[addr][1] = right; 751 return change; 752} 753 754static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0); 755 756#define DUMMY_CAPSRC(xname, xindex, addr) \ 757{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ 758 .info = snd_dummy_capsrc_info, \ 759 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \ 760 .private_value = addr } 761 762#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info 763 764static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol, 765 struct snd_ctl_elem_value *ucontrol) 766{ 767 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 768 int addr = kcontrol->private_value; 769 770 guard(spinlock_irq)(&dummy->mixer_lock); 771 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0]; 772 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1]; 773 return 0; 774} 775 776static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 777{ 778 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 779 int change, addr = kcontrol->private_value; 780 int left, right; 781 782 left = ucontrol->value.integer.value[0] & 1; 783 right = ucontrol->value.integer.value[1] & 1; 784 guard(spinlock_irq)(&dummy->mixer_lock); 785 change = dummy->capture_source[addr][0] != left && 786 dummy->capture_source[addr][1] != right; 787 dummy->capture_source[addr][0] = left; 788 dummy->capture_source[addr][1] = right; 789 return change; 790} 791 792static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol, 793 struct snd_ctl_elem_info *info) 794{ 795 static const char *const names[] = { "None", "CD Player" }; 796 797 return snd_ctl_enum_info(info, 1, 2, names); 798} 799 800static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol, 801 struct snd_ctl_elem_value *value) 802{ 803 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 804 805 value->value.enumerated.item[0] = dummy->iobox; 806 return 0; 807} 808 809static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol, 810 struct snd_ctl_elem_value *value) 811{ 812 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 813 int changed; 814 815 if (value->value.enumerated.item[0] > 1) 816 return -EINVAL; 817 818 changed = value->value.enumerated.item[0] != dummy->iobox; 819 if (changed) { 820 dummy->iobox = value->value.enumerated.item[0]; 821 822 if (dummy->iobox) { 823 dummy->cd_volume_ctl->vd[0].access &= 824 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; 825 dummy->cd_switch_ctl->vd[0].access &= 826 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; 827 } else { 828 dummy->cd_volume_ctl->vd[0].access |= 829 SNDRV_CTL_ELEM_ACCESS_INACTIVE; 830 dummy->cd_switch_ctl->vd[0].access |= 831 SNDRV_CTL_ELEM_ACCESS_INACTIVE; 832 } 833 834 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO, 835 &dummy->cd_volume_ctl->id); 836 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO, 837 &dummy->cd_switch_ctl->id); 838 } 839 840 return changed; 841} 842 843static const struct snd_kcontrol_new snd_dummy_controls[] = { 844DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER), 845DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER), 846DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH), 847DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH), 848DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE), 849DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE), 850DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC), 851DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC), 852DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD), 853DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD), 854{ 855 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 856 .name = "External I/O Box", 857 .info = snd_dummy_iobox_info, 858 .get = snd_dummy_iobox_get, 859 .put = snd_dummy_iobox_put, 860}, 861}; 862 863static int snd_card_dummy_new_mixer(struct snd_dummy *dummy) 864{ 865 struct snd_card *card = dummy->card; 866 struct snd_kcontrol *kcontrol; 867 unsigned int idx; 868 int err; 869 870 spin_lock_init(&dummy->mixer_lock); 871 strscpy(card->mixername, "Dummy Mixer"); 872 dummy->iobox = 1; 873 874 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) { 875 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy); 876 err = snd_ctl_add(card, kcontrol); 877 if (err < 0) 878 return err; 879 if (!strcmp(kcontrol->id.name, "CD Volume")) 880 dummy->cd_volume_ctl = kcontrol; 881 else if (!strcmp(kcontrol->id.name, "CD Capture Switch")) 882 dummy->cd_switch_ctl = kcontrol; 883 884 } 885 return 0; 886} 887 888#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS) 889/* 890 * proc interface 891 */ 892static void print_formats(struct snd_dummy *dummy, 893 struct snd_info_buffer *buffer) 894{ 895 snd_pcm_format_t i; 896 897 pcm_for_each_format(i) { 898 if (dummy->pcm_hw.formats & pcm_format_to_bits(i)) 899 snd_iprintf(buffer, " %s", snd_pcm_format_name(i)); 900 } 901} 902 903static void print_rates(struct snd_dummy *dummy, 904 struct snd_info_buffer *buffer) 905{ 906 static const int rates[] = { 907 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 908 64000, 88200, 96000, 176400, 192000, 909 }; 910 int i; 911 912 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS) 913 snd_iprintf(buffer, " continuous"); 914 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT) 915 snd_iprintf(buffer, " knot"); 916 for (i = 0; i < ARRAY_SIZE(rates); i++) 917 if (dummy->pcm_hw.rates & (1 << i)) 918 snd_iprintf(buffer, " %d", rates[i]); 919} 920 921#define get_dummy_int_ptr(dummy, ofs) \ 922 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs)) 923#define get_dummy_ll_ptr(dummy, ofs) \ 924 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs)) 925 926struct dummy_hw_field { 927 const char *name; 928 const char *format; 929 unsigned int offset; 930 unsigned int size; 931}; 932#define FIELD_ENTRY(item, fmt) { \ 933 .name = #item, \ 934 .format = fmt, \ 935 .offset = offsetof(struct snd_pcm_hardware, item), \ 936 .size = sizeof(dummy_pcm_hardware.item) } 937 938static const struct dummy_hw_field fields[] = { 939 FIELD_ENTRY(formats, "%#llx"), 940 FIELD_ENTRY(rates, "%#x"), 941 FIELD_ENTRY(rate_min, "%d"), 942 FIELD_ENTRY(rate_max, "%d"), 943 FIELD_ENTRY(channels_min, "%d"), 944 FIELD_ENTRY(channels_max, "%d"), 945 FIELD_ENTRY(buffer_bytes_max, "%ld"), 946 FIELD_ENTRY(period_bytes_min, "%ld"), 947 FIELD_ENTRY(period_bytes_max, "%ld"), 948 FIELD_ENTRY(periods_min, "%d"), 949 FIELD_ENTRY(periods_max, "%d"), 950}; 951 952static void dummy_proc_read(struct snd_info_entry *entry, 953 struct snd_info_buffer *buffer) 954{ 955 struct snd_dummy *dummy = entry->private_data; 956 int i; 957 958 for (i = 0; i < ARRAY_SIZE(fields); i++) { 959 snd_iprintf(buffer, "%s ", fields[i].name); 960 if (fields[i].size == sizeof(int)) 961 snd_iprintf(buffer, fields[i].format, 962 *get_dummy_int_ptr(dummy, fields[i].offset)); 963 else 964 snd_iprintf(buffer, fields[i].format, 965 *get_dummy_ll_ptr(dummy, fields[i].offset)); 966 if (!strcmp(fields[i].name, "formats")) 967 print_formats(dummy, buffer); 968 else if (!strcmp(fields[i].name, "rates")) 969 print_rates(dummy, buffer); 970 snd_iprintf(buffer, "\n"); 971 } 972} 973 974static void dummy_proc_write(struct snd_info_entry *entry, 975 struct snd_info_buffer *buffer) 976{ 977 struct snd_dummy *dummy = entry->private_data; 978 char line[64]; 979 980 while (!snd_info_get_line(buffer, line, sizeof(line))) { 981 char item[20]; 982 const char *ptr; 983 unsigned long long val; 984 int i; 985 986 ptr = snd_info_get_str(item, line, sizeof(item)); 987 for (i = 0; i < ARRAY_SIZE(fields); i++) { 988 if (!strcmp(item, fields[i].name)) 989 break; 990 } 991 if (i >= ARRAY_SIZE(fields)) 992 continue; 993 snd_info_get_str(item, ptr, sizeof(item)); 994 if (kstrtoull(item, 0, &val)) 995 continue; 996 if (fields[i].size == sizeof(int)) 997 *get_dummy_int_ptr(dummy, fields[i].offset) = val; 998 else 999 *get_dummy_ll_ptr(dummy, fields[i].offset) = val; 1000 } 1001} 1002 1003static void dummy_proc_init(struct snd_dummy *chip) 1004{ 1005 snd_card_rw_proc_new(chip->card, "dummy_pcm", chip, 1006 dummy_proc_read, dummy_proc_write); 1007} 1008#else 1009#define dummy_proc_init(x) 1010#endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */ 1011 1012static int snd_dummy_probe(struct platform_device *devptr) 1013{ 1014 struct snd_card *card; 1015 struct snd_dummy *dummy; 1016 const struct dummy_model *m = NULL, **mdl; 1017 int idx, err; 1018 int dev = devptr->id; 1019 1020 err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, 1021 sizeof(struct snd_dummy), &card); 1022 if (err < 0) 1023 return err; 1024 dummy = card->private_data; 1025 dummy->card = card; 1026 for (mdl = dummy_models; *mdl && model[dev]; mdl++) { 1027 if (strcmp(model[dev], (*mdl)->name) == 0) { 1028 pr_info("snd-dummy: Using model '%s' for card %i\n", 1029 (*mdl)->name, card->number); 1030 m = dummy->model = *mdl; 1031 break; 1032 } 1033 } 1034 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) { 1035 if (pcm_substreams[dev] < 1) 1036 pcm_substreams[dev] = 1; 1037 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) 1038 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; 1039 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]); 1040 if (err < 0) 1041 return err; 1042 } 1043 1044 dummy->pcm_hw = dummy_pcm_hardware; 1045 if (m) { 1046 if (m->formats) 1047 dummy->pcm_hw.formats = m->formats; 1048 if (m->buffer_bytes_max) 1049 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max; 1050 if (m->period_bytes_min) 1051 dummy->pcm_hw.period_bytes_min = m->period_bytes_min; 1052 if (m->period_bytes_max) 1053 dummy->pcm_hw.period_bytes_max = m->period_bytes_max; 1054 if (m->periods_min) 1055 dummy->pcm_hw.periods_min = m->periods_min; 1056 if (m->periods_max) 1057 dummy->pcm_hw.periods_max = m->periods_max; 1058 if (m->rates) 1059 dummy->pcm_hw.rates = m->rates; 1060 if (m->rate_min) 1061 dummy->pcm_hw.rate_min = m->rate_min; 1062 if (m->rate_max) 1063 dummy->pcm_hw.rate_max = m->rate_max; 1064 if (m->channels_min) 1065 dummy->pcm_hw.channels_min = m->channels_min; 1066 if (m->channels_max) 1067 dummy->pcm_hw.channels_max = m->channels_max; 1068 } 1069 1070 if (mixer_volume_level_min > mixer_volume_level_max) { 1071 pr_warn("snd-dummy: Invalid mixer volume level: min=%d, max=%d. Fall back to default value.\n", 1072 mixer_volume_level_min, mixer_volume_level_max); 1073 mixer_volume_level_min = USE_MIXER_VOLUME_LEVEL_MIN; 1074 mixer_volume_level_max = USE_MIXER_VOLUME_LEVEL_MAX; 1075 } 1076 err = snd_card_dummy_new_mixer(dummy); 1077 if (err < 0) 1078 return err; 1079 strscpy(card->driver, "Dummy"); 1080 strscpy(card->shortname, "Dummy"); 1081 sprintf(card->longname, "Dummy %i", dev + 1); 1082 1083 dummy_proc_init(dummy); 1084 1085 err = snd_card_register(card); 1086 if (err < 0) 1087 return err; 1088 platform_set_drvdata(devptr, card); 1089 return 0; 1090} 1091 1092static int snd_dummy_suspend(struct device *pdev) 1093{ 1094 struct snd_card *card = dev_get_drvdata(pdev); 1095 1096 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 1097 return 0; 1098} 1099 1100static int snd_dummy_resume(struct device *pdev) 1101{ 1102 struct snd_card *card = dev_get_drvdata(pdev); 1103 1104 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 1105 return 0; 1106} 1107 1108static DEFINE_SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume); 1109 1110#define SND_DUMMY_DRIVER "snd_dummy" 1111 1112static struct platform_driver snd_dummy_driver = { 1113 .probe = snd_dummy_probe, 1114 .driver = { 1115 .name = SND_DUMMY_DRIVER, 1116 .pm = &snd_dummy_pm, 1117 }, 1118}; 1119 1120static void snd_dummy_unregister_all(void) 1121{ 1122 int i; 1123 1124 for (i = 0; i < ARRAY_SIZE(devices); ++i) 1125 platform_device_unregister(devices[i]); 1126 platform_driver_unregister(&snd_dummy_driver); 1127 free_fake_buffer(); 1128} 1129 1130static int __init alsa_card_dummy_init(void) 1131{ 1132 int i, cards, err; 1133 1134 err = platform_driver_register(&snd_dummy_driver); 1135 if (err < 0) 1136 return err; 1137 1138 err = alloc_fake_buffer(); 1139 if (err < 0) { 1140 platform_driver_unregister(&snd_dummy_driver); 1141 return err; 1142 } 1143 1144 cards = 0; 1145 for (i = 0; i < SNDRV_CARDS; i++) { 1146 struct platform_device *device; 1147 if (! enable[i]) 1148 continue; 1149 device = platform_device_register_simple(SND_DUMMY_DRIVER, 1150 i, NULL, 0); 1151 if (IS_ERR(device)) 1152 continue; 1153 if (!platform_get_drvdata(device)) { 1154 platform_device_unregister(device); 1155 continue; 1156 } 1157 devices[i] = device; 1158 cards++; 1159 } 1160 if (!cards) { 1161#ifdef MODULE 1162 pr_err("Dummy soundcard not found or device busy\n"); 1163#endif 1164 snd_dummy_unregister_all(); 1165 return -ENODEV; 1166 } 1167 return 0; 1168} 1169 1170static void __exit alsa_card_dummy_exit(void) 1171{ 1172 snd_dummy_unregister_all(); 1173} 1174 1175module_init(alsa_card_dummy_init) 1176module_exit(alsa_card_dummy_exit)
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