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 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}"); 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 47 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 48 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 49 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; 50 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL}; 51 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; 52 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; 53 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2}; 54 #ifdef CONFIG_HIGH_RES_TIMERS 55 static bool hrtimer = 1; 56 #endif 57 static bool fake_buffer = 1; 58 59 module_param_array(index, int, NULL, 0444); 60 MODULE_PARM_DESC(index, "Index value for dummy soundcard."); 61 module_param_array(id, charp, NULL, 0444); 62 MODULE_PARM_DESC(id, "ID string for dummy soundcard."); 63 module_param_array(enable, bool, NULL, 0444); 64 MODULE_PARM_DESC(enable, "Enable this dummy soundcard."); 65 module_param_array(model, charp, NULL, 0444); 66 MODULE_PARM_DESC(model, "Soundcard model."); 67 module_param_array(pcm_devs, int, NULL, 0444); 68 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver."); 69 module_param_array(pcm_substreams, int, NULL, 0444); 70 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver."); 71 //module_param_array(midi_devs, int, NULL, 0444); 72 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver."); 73 module_param(fake_buffer, bool, 0444); 74 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations."); 75 #ifdef CONFIG_HIGH_RES_TIMERS 76 module_param(hrtimer, bool, 0644); 77 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source."); 78 #endif 79 80 static struct platform_device *devices[SNDRV_CARDS]; 81 82 #define MIXER_ADDR_MASTER 0 83 #define MIXER_ADDR_LINE 1 84 #define MIXER_ADDR_MIC 2 85 #define MIXER_ADDR_SYNTH 3 86 #define MIXER_ADDR_CD 4 87 #define MIXER_ADDR_LAST 4 88 89 struct dummy_timer_ops { 90 int (*create)(struct snd_pcm_substream *); 91 void (*free)(struct snd_pcm_substream *); 92 int (*prepare)(struct snd_pcm_substream *); 93 int (*start)(struct snd_pcm_substream *); 94 int (*stop)(struct snd_pcm_substream *); 95 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *); 96 }; 97 98 #define get_dummy_ops(substream) \ 99 (*(const struct dummy_timer_ops **)(substream)->runtime->private_data) 100 101 struct dummy_model { 102 const char *name; 103 int (*playback_constraints)(struct snd_pcm_runtime *runtime); 104 int (*capture_constraints)(struct snd_pcm_runtime *runtime); 105 u64 formats; 106 size_t buffer_bytes_max; 107 size_t period_bytes_min; 108 size_t period_bytes_max; 109 unsigned int periods_min; 110 unsigned int periods_max; 111 unsigned int rates; 112 unsigned int rate_min; 113 unsigned int rate_max; 114 unsigned int channels_min; 115 unsigned int channels_max; 116 }; 117 118 struct snd_dummy { 119 struct snd_card *card; 120 const struct dummy_model *model; 121 struct snd_pcm *pcm; 122 struct snd_pcm_hardware pcm_hw; 123 spinlock_t mixer_lock; 124 int mixer_volume[MIXER_ADDR_LAST+1][2]; 125 int capture_source[MIXER_ADDR_LAST+1][2]; 126 int iobox; 127 struct snd_kcontrol *cd_volume_ctl; 128 struct snd_kcontrol *cd_switch_ctl; 129 }; 130 131 /* 132 * card models 133 */ 134 135 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime) 136 { 137 int err; 138 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 139 if (err < 0) 140 return err; 141 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX); 142 if (err < 0) 143 return err; 144 return 0; 145 } 146 147 static const struct dummy_model model_emu10k1 = { 148 .name = "emu10k1", 149 .playback_constraints = emu10k1_playback_constraints, 150 .buffer_bytes_max = 128 * 1024, 151 }; 152 153 static const struct dummy_model model_rme9652 = { 154 .name = "rme9652", 155 .buffer_bytes_max = 26 * 64 * 1024, 156 .formats = SNDRV_PCM_FMTBIT_S32_LE, 157 .channels_min = 26, 158 .channels_max = 26, 159 .periods_min = 2, 160 .periods_max = 2, 161 }; 162 163 static const struct dummy_model model_ice1712 = { 164 .name = "ice1712", 165 .buffer_bytes_max = 256 * 1024, 166 .formats = SNDRV_PCM_FMTBIT_S32_LE, 167 .channels_min = 10, 168 .channels_max = 10, 169 .periods_min = 1, 170 .periods_max = 1024, 171 }; 172 173 static const struct dummy_model model_uda1341 = { 174 .name = "uda1341", 175 .buffer_bytes_max = 16380, 176 .formats = SNDRV_PCM_FMTBIT_S16_LE, 177 .channels_min = 2, 178 .channels_max = 2, 179 .periods_min = 2, 180 .periods_max = 255, 181 }; 182 183 static const struct dummy_model model_ac97 = { 184 .name = "ac97", 185 .formats = SNDRV_PCM_FMTBIT_S16_LE, 186 .channels_min = 2, 187 .channels_max = 2, 188 .rates = SNDRV_PCM_RATE_48000, 189 .rate_min = 48000, 190 .rate_max = 48000, 191 }; 192 193 static const struct dummy_model model_ca0106 = { 194 .name = "ca0106", 195 .formats = SNDRV_PCM_FMTBIT_S16_LE, 196 .buffer_bytes_max = ((65536-64)*8), 197 .period_bytes_max = (65536-64), 198 .periods_min = 2, 199 .periods_max = 8, 200 .channels_min = 2, 201 .channels_max = 2, 202 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000, 203 .rate_min = 48000, 204 .rate_max = 192000, 205 }; 206 207 static const struct dummy_model *dummy_models[] = { 208 &model_emu10k1, 209 &model_rme9652, 210 &model_ice1712, 211 &model_uda1341, 212 &model_ac97, 213 &model_ca0106, 214 NULL 215 }; 216 217 /* 218 * system timer interface 219 */ 220 221 struct dummy_systimer_pcm { 222 /* ops must be the first item */ 223 const struct dummy_timer_ops *timer_ops; 224 spinlock_t lock; 225 struct timer_list timer; 226 unsigned long base_time; 227 unsigned int frac_pos; /* fractional sample position (based HZ) */ 228 unsigned int frac_period_rest; 229 unsigned int frac_buffer_size; /* buffer_size * HZ */ 230 unsigned int frac_period_size; /* period_size * HZ */ 231 unsigned int rate; 232 int elapsed; 233 struct snd_pcm_substream *substream; 234 }; 235 236 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm) 237 { 238 mod_timer(&dpcm->timer, jiffies + 239 DIV_ROUND_UP(dpcm->frac_period_rest, dpcm->rate)); 240 } 241 242 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm) 243 { 244 unsigned long delta; 245 246 delta = jiffies - dpcm->base_time; 247 if (!delta) 248 return; 249 dpcm->base_time += delta; 250 delta *= dpcm->rate; 251 dpcm->frac_pos += delta; 252 while (dpcm->frac_pos >= dpcm->frac_buffer_size) 253 dpcm->frac_pos -= dpcm->frac_buffer_size; 254 while (dpcm->frac_period_rest <= delta) { 255 dpcm->elapsed++; 256 dpcm->frac_period_rest += dpcm->frac_period_size; 257 } 258 dpcm->frac_period_rest -= delta; 259 } 260 261 static int dummy_systimer_start(struct snd_pcm_substream *substream) 262 { 263 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 264 spin_lock(&dpcm->lock); 265 dpcm->base_time = jiffies; 266 dummy_systimer_rearm(dpcm); 267 spin_unlock(&dpcm->lock); 268 return 0; 269 } 270 271 static int dummy_systimer_stop(struct snd_pcm_substream *substream) 272 { 273 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 274 spin_lock(&dpcm->lock); 275 del_timer(&dpcm->timer); 276 spin_unlock(&dpcm->lock); 277 return 0; 278 } 279 280 static int dummy_systimer_prepare(struct snd_pcm_substream *substream) 281 { 282 struct snd_pcm_runtime *runtime = substream->runtime; 283 struct dummy_systimer_pcm *dpcm = runtime->private_data; 284 285 dpcm->frac_pos = 0; 286 dpcm->rate = runtime->rate; 287 dpcm->frac_buffer_size = runtime->buffer_size * HZ; 288 dpcm->frac_period_size = runtime->period_size * HZ; 289 dpcm->frac_period_rest = dpcm->frac_period_size; 290 dpcm->elapsed = 0; 291 292 return 0; 293 } 294 295 static void dummy_systimer_callback(struct timer_list *t) 296 { 297 struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer); 298 unsigned long flags; 299 int elapsed = 0; 300 301 spin_lock_irqsave(&dpcm->lock, flags); 302 dummy_systimer_update(dpcm); 303 dummy_systimer_rearm(dpcm); 304 elapsed = dpcm->elapsed; 305 dpcm->elapsed = 0; 306 spin_unlock_irqrestore(&dpcm->lock, flags); 307 if (elapsed) 308 snd_pcm_period_elapsed(dpcm->substream); 309 } 310 311 static snd_pcm_uframes_t 312 dummy_systimer_pointer(struct snd_pcm_substream *substream) 313 { 314 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data; 315 snd_pcm_uframes_t pos; 316 317 spin_lock(&dpcm->lock); 318 dummy_systimer_update(dpcm); 319 pos = dpcm->frac_pos / HZ; 320 spin_unlock(&dpcm->lock); 321 return pos; 322 } 323 324 static int dummy_systimer_create(struct snd_pcm_substream *substream) 325 { 326 struct dummy_systimer_pcm *dpcm; 327 328 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 329 if (!dpcm) 330 return -ENOMEM; 331 substream->runtime->private_data = dpcm; 332 timer_setup(&dpcm->timer, dummy_systimer_callback, 0); 333 spin_lock_init(&dpcm->lock); 334 dpcm->substream = substream; 335 return 0; 336 } 337 338 static void dummy_systimer_free(struct snd_pcm_substream *substream) 339 { 340 kfree(substream->runtime->private_data); 341 } 342 343 static const struct dummy_timer_ops dummy_systimer_ops = { 344 .create = dummy_systimer_create, 345 .free = dummy_systimer_free, 346 .prepare = dummy_systimer_prepare, 347 .start = dummy_systimer_start, 348 .stop = dummy_systimer_stop, 349 .pointer = dummy_systimer_pointer, 350 }; 351 352 #ifdef CONFIG_HIGH_RES_TIMERS 353 /* 354 * hrtimer interface 355 */ 356 357 struct dummy_hrtimer_pcm { 358 /* ops must be the first item */ 359 const struct dummy_timer_ops *timer_ops; 360 ktime_t base_time; 361 ktime_t period_time; 362 atomic_t running; 363 struct hrtimer timer; 364 struct snd_pcm_substream *substream; 365 }; 366 367 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer) 368 { 369 struct dummy_hrtimer_pcm *dpcm; 370 371 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer); 372 if (!atomic_read(&dpcm->running)) 373 return HRTIMER_NORESTART; 374 /* 375 * In cases of XRUN and draining, this calls .trigger to stop PCM 376 * substream. 377 */ 378 snd_pcm_period_elapsed(dpcm->substream); 379 if (!atomic_read(&dpcm->running)) 380 return HRTIMER_NORESTART; 381 382 hrtimer_forward_now(timer, dpcm->period_time); 383 return HRTIMER_RESTART; 384 } 385 386 static int dummy_hrtimer_start(struct snd_pcm_substream *substream) 387 { 388 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 389 390 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer); 391 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT); 392 atomic_set(&dpcm->running, 1); 393 return 0; 394 } 395 396 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream) 397 { 398 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 399 400 atomic_set(&dpcm->running, 0); 401 if (!hrtimer_callback_running(&dpcm->timer)) 402 hrtimer_cancel(&dpcm->timer); 403 return 0; 404 } 405 406 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm) 407 { 408 hrtimer_cancel(&dpcm->timer); 409 } 410 411 static snd_pcm_uframes_t 412 dummy_hrtimer_pointer(struct snd_pcm_substream *substream) 413 { 414 struct snd_pcm_runtime *runtime = substream->runtime; 415 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 416 u64 delta; 417 u32 pos; 418 419 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer), 420 dpcm->base_time); 421 delta = div_u64(delta * runtime->rate + 999999, 1000000); 422 div_u64_rem(delta, runtime->buffer_size, &pos); 423 return pos; 424 } 425 426 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream) 427 { 428 struct snd_pcm_runtime *runtime = substream->runtime; 429 struct dummy_hrtimer_pcm *dpcm = runtime->private_data; 430 unsigned int period, rate; 431 long sec; 432 unsigned long nsecs; 433 434 dummy_hrtimer_sync(dpcm); 435 period = runtime->period_size; 436 rate = runtime->rate; 437 sec = period / rate; 438 period %= rate; 439 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate); 440 dpcm->period_time = ktime_set(sec, nsecs); 441 442 return 0; 443 } 444 445 static int dummy_hrtimer_create(struct snd_pcm_substream *substream) 446 { 447 struct dummy_hrtimer_pcm *dpcm; 448 449 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 450 if (!dpcm) 451 return -ENOMEM; 452 substream->runtime->private_data = dpcm; 453 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); 454 dpcm->timer.function = dummy_hrtimer_callback; 455 dpcm->substream = substream; 456 atomic_set(&dpcm->running, 0); 457 return 0; 458 } 459 460 static void dummy_hrtimer_free(struct snd_pcm_substream *substream) 461 { 462 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data; 463 dummy_hrtimer_sync(dpcm); 464 kfree(dpcm); 465 } 466 467 static const struct dummy_timer_ops dummy_hrtimer_ops = { 468 .create = dummy_hrtimer_create, 469 .free = dummy_hrtimer_free, 470 .prepare = dummy_hrtimer_prepare, 471 .start = dummy_hrtimer_start, 472 .stop = dummy_hrtimer_stop, 473 .pointer = dummy_hrtimer_pointer, 474 }; 475 476 #endif /* CONFIG_HIGH_RES_TIMERS */ 477 478 /* 479 * PCM interface 480 */ 481 482 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 483 { 484 switch (cmd) { 485 case SNDRV_PCM_TRIGGER_START: 486 case SNDRV_PCM_TRIGGER_RESUME: 487 return get_dummy_ops(substream)->start(substream); 488 case SNDRV_PCM_TRIGGER_STOP: 489 case SNDRV_PCM_TRIGGER_SUSPEND: 490 return get_dummy_ops(substream)->stop(substream); 491 } 492 return -EINVAL; 493 } 494 495 static int dummy_pcm_prepare(struct snd_pcm_substream *substream) 496 { 497 return get_dummy_ops(substream)->prepare(substream); 498 } 499 500 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream) 501 { 502 return get_dummy_ops(substream)->pointer(substream); 503 } 504 505 static const struct snd_pcm_hardware dummy_pcm_hardware = { 506 .info = (SNDRV_PCM_INFO_MMAP | 507 SNDRV_PCM_INFO_INTERLEAVED | 508 SNDRV_PCM_INFO_RESUME | 509 SNDRV_PCM_INFO_MMAP_VALID), 510 .formats = USE_FORMATS, 511 .rates = USE_RATE, 512 .rate_min = USE_RATE_MIN, 513 .rate_max = USE_RATE_MAX, 514 .channels_min = USE_CHANNELS_MIN, 515 .channels_max = USE_CHANNELS_MAX, 516 .buffer_bytes_max = MAX_BUFFER_SIZE, 517 .period_bytes_min = MIN_PERIOD_SIZE, 518 .period_bytes_max = MAX_PERIOD_SIZE, 519 .periods_min = USE_PERIODS_MIN, 520 .periods_max = USE_PERIODS_MAX, 521 .fifo_size = 0, 522 }; 523 524 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream, 525 struct snd_pcm_hw_params *hw_params) 526 { 527 if (fake_buffer) { 528 /* runtime->dma_bytes has to be set manually to allow mmap */ 529 substream->runtime->dma_bytes = params_buffer_bytes(hw_params); 530 return 0; 531 } 532 return 0; 533 } 534 535 static int dummy_pcm_open(struct snd_pcm_substream *substream) 536 { 537 struct snd_dummy *dummy = snd_pcm_substream_chip(substream); 538 const struct dummy_model *model = dummy->model; 539 struct snd_pcm_runtime *runtime = substream->runtime; 540 const struct dummy_timer_ops *ops; 541 int err; 542 543 ops = &dummy_systimer_ops; 544 #ifdef CONFIG_HIGH_RES_TIMERS 545 if (hrtimer) 546 ops = &dummy_hrtimer_ops; 547 #endif 548 549 err = ops->create(substream); 550 if (err < 0) 551 return err; 552 get_dummy_ops(substream) = ops; 553 554 runtime->hw = dummy->pcm_hw; 555 if (substream->pcm->device & 1) { 556 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED; 557 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED; 558 } 559 if (substream->pcm->device & 2) 560 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP | 561 SNDRV_PCM_INFO_MMAP_VALID); 562 563 if (model == NULL) 564 return 0; 565 566 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 567 if (model->playback_constraints) 568 err = model->playback_constraints(substream->runtime); 569 } else { 570 if (model->capture_constraints) 571 err = model->capture_constraints(substream->runtime); 572 } 573 if (err < 0) { 574 get_dummy_ops(substream)->free(substream); 575 return err; 576 } 577 return 0; 578 } 579 580 static int dummy_pcm_close(struct snd_pcm_substream *substream) 581 { 582 get_dummy_ops(substream)->free(substream); 583 return 0; 584 } 585 586 /* 587 * dummy buffer handling 588 */ 589 590 static void *dummy_page[2]; 591 592 static void free_fake_buffer(void) 593 { 594 if (fake_buffer) { 595 int i; 596 for (i = 0; i < 2; i++) 597 if (dummy_page[i]) { 598 free_page((unsigned long)dummy_page[i]); 599 dummy_page[i] = NULL; 600 } 601 } 602 } 603 604 static int alloc_fake_buffer(void) 605 { 606 int i; 607 608 if (!fake_buffer) 609 return 0; 610 for (i = 0; i < 2; i++) { 611 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL); 612 if (!dummy_page[i]) { 613 free_fake_buffer(); 614 return -ENOMEM; 615 } 616 } 617 return 0; 618 } 619 620 static int dummy_pcm_copy(struct snd_pcm_substream *substream, 621 int channel, unsigned long pos, 622 void __user *dst, unsigned long bytes) 623 { 624 return 0; /* do nothing */ 625 } 626 627 static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream, 628 int channel, unsigned long pos, 629 void *dst, unsigned long bytes) 630 { 631 return 0; /* do nothing */ 632 } 633 634 static int dummy_pcm_silence(struct snd_pcm_substream *substream, 635 int channel, unsigned long pos, 636 unsigned long bytes) 637 { 638 return 0; /* do nothing */ 639 } 640 641 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream, 642 unsigned long offset) 643 { 644 return virt_to_page(dummy_page[substream->stream]); /* the same page */ 645 } 646 647 static const struct snd_pcm_ops dummy_pcm_ops = { 648 .open = dummy_pcm_open, 649 .close = dummy_pcm_close, 650 .hw_params = dummy_pcm_hw_params, 651 .prepare = dummy_pcm_prepare, 652 .trigger = dummy_pcm_trigger, 653 .pointer = dummy_pcm_pointer, 654 }; 655 656 static const struct snd_pcm_ops dummy_pcm_ops_no_buf = { 657 .open = dummy_pcm_open, 658 .close = dummy_pcm_close, 659 .hw_params = dummy_pcm_hw_params, 660 .prepare = dummy_pcm_prepare, 661 .trigger = dummy_pcm_trigger, 662 .pointer = dummy_pcm_pointer, 663 .copy_user = dummy_pcm_copy, 664 .copy_kernel = dummy_pcm_copy_kernel, 665 .fill_silence = dummy_pcm_silence, 666 .page = dummy_pcm_page, 667 }; 668 669 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device, 670 int substreams) 671 { 672 struct snd_pcm *pcm; 673 const struct snd_pcm_ops *ops; 674 int err; 675 676 err = snd_pcm_new(dummy->card, "Dummy PCM", device, 677 substreams, substreams, &pcm); 678 if (err < 0) 679 return err; 680 dummy->pcm = pcm; 681 if (fake_buffer) 682 ops = &dummy_pcm_ops_no_buf; 683 else 684 ops = &dummy_pcm_ops; 685 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops); 686 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops); 687 pcm->private_data = dummy; 688 pcm->info_flags = 0; 689 strcpy(pcm->name, "Dummy PCM"); 690 if (!fake_buffer) { 691 snd_pcm_set_managed_buffer_all(pcm, 692 SNDRV_DMA_TYPE_CONTINUOUS, 693 NULL, 694 0, 64*1024); 695 } 696 return 0; 697 } 698 699 /* 700 * mixer interface 701 */ 702 703 #define DUMMY_VOLUME(xname, xindex, addr) \ 704 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 705 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \ 706 .name = xname, .index = xindex, \ 707 .info = snd_dummy_volume_info, \ 708 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \ 709 .private_value = addr, \ 710 .tlv = { .p = db_scale_dummy } } 711 712 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol, 713 struct snd_ctl_elem_info *uinfo) 714 { 715 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 716 uinfo->count = 2; 717 uinfo->value.integer.min = -50; 718 uinfo->value.integer.max = 100; 719 return 0; 720 } 721 722 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol, 723 struct snd_ctl_elem_value *ucontrol) 724 { 725 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 726 int addr = kcontrol->private_value; 727 728 spin_lock_irq(&dummy->mixer_lock); 729 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0]; 730 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1]; 731 spin_unlock_irq(&dummy->mixer_lock); 732 return 0; 733 } 734 735 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol, 736 struct snd_ctl_elem_value *ucontrol) 737 { 738 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 739 int change, addr = kcontrol->private_value; 740 int left, right; 741 742 left = ucontrol->value.integer.value[0]; 743 if (left < -50) 744 left = -50; 745 if (left > 100) 746 left = 100; 747 right = ucontrol->value.integer.value[1]; 748 if (right < -50) 749 right = -50; 750 if (right > 100) 751 right = 100; 752 spin_lock_irq(&dummy->mixer_lock); 753 change = dummy->mixer_volume[addr][0] != left || 754 dummy->mixer_volume[addr][1] != right; 755 dummy->mixer_volume[addr][0] = left; 756 dummy->mixer_volume[addr][1] = right; 757 spin_unlock_irq(&dummy->mixer_lock); 758 return change; 759 } 760 761 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0); 762 763 #define DUMMY_CAPSRC(xname, xindex, addr) \ 764 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ 765 .info = snd_dummy_capsrc_info, \ 766 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \ 767 .private_value = addr } 768 769 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info 770 771 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol, 772 struct snd_ctl_elem_value *ucontrol) 773 { 774 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 775 int addr = kcontrol->private_value; 776 777 spin_lock_irq(&dummy->mixer_lock); 778 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0]; 779 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1]; 780 spin_unlock_irq(&dummy->mixer_lock); 781 return 0; 782 } 783 784 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 785 { 786 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 787 int change, addr = kcontrol->private_value; 788 int left, right; 789 790 left = ucontrol->value.integer.value[0] & 1; 791 right = ucontrol->value.integer.value[1] & 1; 792 spin_lock_irq(&dummy->mixer_lock); 793 change = dummy->capture_source[addr][0] != left && 794 dummy->capture_source[addr][1] != right; 795 dummy->capture_source[addr][0] = left; 796 dummy->capture_source[addr][1] = right; 797 spin_unlock_irq(&dummy->mixer_lock); 798 return change; 799 } 800 801 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol, 802 struct snd_ctl_elem_info *info) 803 { 804 static const char *const names[] = { "None", "CD Player" }; 805 806 return snd_ctl_enum_info(info, 1, 2, names); 807 } 808 809 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol, 810 struct snd_ctl_elem_value *value) 811 { 812 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 813 814 value->value.enumerated.item[0] = dummy->iobox; 815 return 0; 816 } 817 818 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol, 819 struct snd_ctl_elem_value *value) 820 { 821 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol); 822 int changed; 823 824 if (value->value.enumerated.item[0] > 1) 825 return -EINVAL; 826 827 changed = value->value.enumerated.item[0] != dummy->iobox; 828 if (changed) { 829 dummy->iobox = value->value.enumerated.item[0]; 830 831 if (dummy->iobox) { 832 dummy->cd_volume_ctl->vd[0].access &= 833 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; 834 dummy->cd_switch_ctl->vd[0].access &= 835 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; 836 } else { 837 dummy->cd_volume_ctl->vd[0].access |= 838 SNDRV_CTL_ELEM_ACCESS_INACTIVE; 839 dummy->cd_switch_ctl->vd[0].access |= 840 SNDRV_CTL_ELEM_ACCESS_INACTIVE; 841 } 842 843 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO, 844 &dummy->cd_volume_ctl->id); 845 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO, 846 &dummy->cd_switch_ctl->id); 847 } 848 849 return changed; 850 } 851 852 static const struct snd_kcontrol_new snd_dummy_controls[] = { 853 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER), 854 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER), 855 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH), 856 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH), 857 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE), 858 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE), 859 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC), 860 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC), 861 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD), 862 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD), 863 { 864 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 865 .name = "External I/O Box", 866 .info = snd_dummy_iobox_info, 867 .get = snd_dummy_iobox_get, 868 .put = snd_dummy_iobox_put, 869 }, 870 }; 871 872 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy) 873 { 874 struct snd_card *card = dummy->card; 875 struct snd_kcontrol *kcontrol; 876 unsigned int idx; 877 int err; 878 879 spin_lock_init(&dummy->mixer_lock); 880 strcpy(card->mixername, "Dummy Mixer"); 881 dummy->iobox = 1; 882 883 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) { 884 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy); 885 err = snd_ctl_add(card, kcontrol); 886 if (err < 0) 887 return err; 888 if (!strcmp(kcontrol->id.name, "CD Volume")) 889 dummy->cd_volume_ctl = kcontrol; 890 else if (!strcmp(kcontrol->id.name, "CD Capture Switch")) 891 dummy->cd_switch_ctl = kcontrol; 892 893 } 894 return 0; 895 } 896 897 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS) 898 /* 899 * proc interface 900 */ 901 static void print_formats(struct snd_dummy *dummy, 902 struct snd_info_buffer *buffer) 903 { 904 snd_pcm_format_t i; 905 906 pcm_for_each_format(i) { 907 if (dummy->pcm_hw.formats & pcm_format_to_bits(i)) 908 snd_iprintf(buffer, " %s", snd_pcm_format_name(i)); 909 } 910 } 911 912 static void print_rates(struct snd_dummy *dummy, 913 struct snd_info_buffer *buffer) 914 { 915 static const int rates[] = { 916 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 917 64000, 88200, 96000, 176400, 192000, 918 }; 919 int i; 920 921 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS) 922 snd_iprintf(buffer, " continuous"); 923 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT) 924 snd_iprintf(buffer, " knot"); 925 for (i = 0; i < ARRAY_SIZE(rates); i++) 926 if (dummy->pcm_hw.rates & (1 << i)) 927 snd_iprintf(buffer, " %d", rates[i]); 928 } 929 930 #define get_dummy_int_ptr(dummy, ofs) \ 931 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs)) 932 #define get_dummy_ll_ptr(dummy, ofs) \ 933 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs)) 934 935 struct dummy_hw_field { 936 const char *name; 937 const char *format; 938 unsigned int offset; 939 unsigned int size; 940 }; 941 #define FIELD_ENTRY(item, fmt) { \ 942 .name = #item, \ 943 .format = fmt, \ 944 .offset = offsetof(struct snd_pcm_hardware, item), \ 945 .size = sizeof(dummy_pcm_hardware.item) } 946 947 static const struct dummy_hw_field fields[] = { 948 FIELD_ENTRY(formats, "%#llx"), 949 FIELD_ENTRY(rates, "%#x"), 950 FIELD_ENTRY(rate_min, "%d"), 951 FIELD_ENTRY(rate_max, "%d"), 952 FIELD_ENTRY(channels_min, "%d"), 953 FIELD_ENTRY(channels_max, "%d"), 954 FIELD_ENTRY(buffer_bytes_max, "%ld"), 955 FIELD_ENTRY(period_bytes_min, "%ld"), 956 FIELD_ENTRY(period_bytes_max, "%ld"), 957 FIELD_ENTRY(periods_min, "%d"), 958 FIELD_ENTRY(periods_max, "%d"), 959 }; 960 961 static void dummy_proc_read(struct snd_info_entry *entry, 962 struct snd_info_buffer *buffer) 963 { 964 struct snd_dummy *dummy = entry->private_data; 965 int i; 966 967 for (i = 0; i < ARRAY_SIZE(fields); i++) { 968 snd_iprintf(buffer, "%s ", fields[i].name); 969 if (fields[i].size == sizeof(int)) 970 snd_iprintf(buffer, fields[i].format, 971 *get_dummy_int_ptr(dummy, fields[i].offset)); 972 else 973 snd_iprintf(buffer, fields[i].format, 974 *get_dummy_ll_ptr(dummy, fields[i].offset)); 975 if (!strcmp(fields[i].name, "formats")) 976 print_formats(dummy, buffer); 977 else if (!strcmp(fields[i].name, "rates")) 978 print_rates(dummy, buffer); 979 snd_iprintf(buffer, "\n"); 980 } 981 } 982 983 static void dummy_proc_write(struct snd_info_entry *entry, 984 struct snd_info_buffer *buffer) 985 { 986 struct snd_dummy *dummy = entry->private_data; 987 char line[64]; 988 989 while (!snd_info_get_line(buffer, line, sizeof(line))) { 990 char item[20]; 991 const char *ptr; 992 unsigned long long val; 993 int i; 994 995 ptr = snd_info_get_str(item, line, sizeof(item)); 996 for (i = 0; i < ARRAY_SIZE(fields); i++) { 997 if (!strcmp(item, fields[i].name)) 998 break; 999 } 1000 if (i >= ARRAY_SIZE(fields)) 1001 continue; 1002 snd_info_get_str(item, ptr, sizeof(item)); 1003 if (kstrtoull(item, 0, &val)) 1004 continue; 1005 if (fields[i].size == sizeof(int)) 1006 *get_dummy_int_ptr(dummy, fields[i].offset) = val; 1007 else 1008 *get_dummy_ll_ptr(dummy, fields[i].offset) = val; 1009 } 1010 } 1011 1012 static void dummy_proc_init(struct snd_dummy *chip) 1013 { 1014 snd_card_rw_proc_new(chip->card, "dummy_pcm", chip, 1015 dummy_proc_read, dummy_proc_write); 1016 } 1017 #else 1018 #define dummy_proc_init(x) 1019 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */ 1020 1021 static int snd_dummy_probe(struct platform_device *devptr) 1022 { 1023 struct snd_card *card; 1024 struct snd_dummy *dummy; 1025 const struct dummy_model *m = NULL, **mdl; 1026 int idx, err; 1027 int dev = devptr->id; 1028 1029 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, 1030 sizeof(struct snd_dummy), &card); 1031 if (err < 0) 1032 return err; 1033 dummy = card->private_data; 1034 dummy->card = card; 1035 for (mdl = dummy_models; *mdl && model[dev]; mdl++) { 1036 if (strcmp(model[dev], (*mdl)->name) == 0) { 1037 printk(KERN_INFO 1038 "snd-dummy: Using model '%s' for card %i\n", 1039 (*mdl)->name, card->number); 1040 m = dummy->model = *mdl; 1041 break; 1042 } 1043 } 1044 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) { 1045 if (pcm_substreams[dev] < 1) 1046 pcm_substreams[dev] = 1; 1047 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) 1048 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; 1049 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]); 1050 if (err < 0) 1051 goto __nodev; 1052 } 1053 1054 dummy->pcm_hw = dummy_pcm_hardware; 1055 if (m) { 1056 if (m->formats) 1057 dummy->pcm_hw.formats = m->formats; 1058 if (m->buffer_bytes_max) 1059 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max; 1060 if (m->period_bytes_min) 1061 dummy->pcm_hw.period_bytes_min = m->period_bytes_min; 1062 if (m->period_bytes_max) 1063 dummy->pcm_hw.period_bytes_max = m->period_bytes_max; 1064 if (m->periods_min) 1065 dummy->pcm_hw.periods_min = m->periods_min; 1066 if (m->periods_max) 1067 dummy->pcm_hw.periods_max = m->periods_max; 1068 if (m->rates) 1069 dummy->pcm_hw.rates = m->rates; 1070 if (m->rate_min) 1071 dummy->pcm_hw.rate_min = m->rate_min; 1072 if (m->rate_max) 1073 dummy->pcm_hw.rate_max = m->rate_max; 1074 if (m->channels_min) 1075 dummy->pcm_hw.channels_min = m->channels_min; 1076 if (m->channels_max) 1077 dummy->pcm_hw.channels_max = m->channels_max; 1078 } 1079 1080 err = snd_card_dummy_new_mixer(dummy); 1081 if (err < 0) 1082 goto __nodev; 1083 strcpy(card->driver, "Dummy"); 1084 strcpy(card->shortname, "Dummy"); 1085 sprintf(card->longname, "Dummy %i", dev + 1); 1086 1087 dummy_proc_init(dummy); 1088 1089 err = snd_card_register(card); 1090 if (err == 0) { 1091 platform_set_drvdata(devptr, card); 1092 return 0; 1093 } 1094 __nodev: 1095 snd_card_free(card); 1096 return err; 1097 } 1098 1099 static int snd_dummy_remove(struct platform_device *devptr) 1100 { 1101 snd_card_free(platform_get_drvdata(devptr)); 1102 return 0; 1103 } 1104 1105 #ifdef CONFIG_PM_SLEEP 1106 static int snd_dummy_suspend(struct device *pdev) 1107 { 1108 struct snd_card *card = dev_get_drvdata(pdev); 1109 1110 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 1111 return 0; 1112 } 1113 1114 static int snd_dummy_resume(struct device *pdev) 1115 { 1116 struct snd_card *card = dev_get_drvdata(pdev); 1117 1118 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 1119 return 0; 1120 } 1121 1122 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume); 1123 #define SND_DUMMY_PM_OPS &snd_dummy_pm 1124 #else 1125 #define SND_DUMMY_PM_OPS NULL 1126 #endif 1127 1128 #define SND_DUMMY_DRIVER "snd_dummy" 1129 1130 static struct platform_driver snd_dummy_driver = { 1131 .probe = snd_dummy_probe, 1132 .remove = snd_dummy_remove, 1133 .driver = { 1134 .name = SND_DUMMY_DRIVER, 1135 .pm = SND_DUMMY_PM_OPS, 1136 }, 1137 }; 1138 1139 static void snd_dummy_unregister_all(void) 1140 { 1141 int i; 1142 1143 for (i = 0; i < ARRAY_SIZE(devices); ++i) 1144 platform_device_unregister(devices[i]); 1145 platform_driver_unregister(&snd_dummy_driver); 1146 free_fake_buffer(); 1147 } 1148 1149 static int __init alsa_card_dummy_init(void) 1150 { 1151 int i, cards, err; 1152 1153 err = platform_driver_register(&snd_dummy_driver); 1154 if (err < 0) 1155 return err; 1156 1157 err = alloc_fake_buffer(); 1158 if (err < 0) { 1159 platform_driver_unregister(&snd_dummy_driver); 1160 return err; 1161 } 1162 1163 cards = 0; 1164 for (i = 0; i < SNDRV_CARDS; i++) { 1165 struct platform_device *device; 1166 if (! enable[i]) 1167 continue; 1168 device = platform_device_register_simple(SND_DUMMY_DRIVER, 1169 i, NULL, 0); 1170 if (IS_ERR(device)) 1171 continue; 1172 if (!platform_get_drvdata(device)) { 1173 platform_device_unregister(device); 1174 continue; 1175 } 1176 devices[i] = device; 1177 cards++; 1178 } 1179 if (!cards) { 1180 #ifdef MODULE 1181 printk(KERN_ERR "Dummy soundcard not found or device busy\n"); 1182 #endif 1183 snd_dummy_unregister_all(); 1184 return -ENODEV; 1185 } 1186 return 0; 1187 } 1188 1189 static void __exit alsa_card_dummy_exit(void) 1190 { 1191 snd_dummy_unregister_all(); 1192 } 1193 1194 module_init(alsa_card_dummy_init) 1195 module_exit(alsa_card_dummy_exit) 1196