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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
25MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
26MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
27MODULE_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#define USE_MIXER_VOLUME_LEVEL_MIN -50
46#define USE_MIXER_VOLUME_LEVEL_MAX 100
47
48static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
49static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
50static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
51static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
52static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
53static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
54//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
55static int mixer_volume_level_min = USE_MIXER_VOLUME_LEVEL_MIN;
56static int mixer_volume_level_max = USE_MIXER_VOLUME_LEVEL_MAX;
57#ifdef CONFIG_HIGH_RES_TIMERS
58static bool hrtimer = 1;
59#endif
60static bool fake_buffer = 1;
61
62module_param_array(index, int, NULL, 0444);
63MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
64module_param_array(id, charp, NULL, 0444);
65MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
66module_param_array(enable, bool, NULL, 0444);
67MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
68module_param_array(model, charp, NULL, 0444);
69MODULE_PARM_DESC(model, "Soundcard model.");
70module_param_array(pcm_devs, int, NULL, 0444);
71MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
72module_param_array(pcm_substreams, int, NULL, 0444);
73MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
74//module_param_array(midi_devs, int, NULL, 0444);
75//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
76module_param(mixer_volume_level_min, int, 0444);
77MODULE_PARM_DESC(mixer_volume_level_min, "Minimum mixer volume level for dummy driver. Default: -50");
78module_param(mixer_volume_level_max, int, 0444);
79MODULE_PARM_DESC(mixer_volume_level_max, "Maximum mixer volume level for dummy driver. Default: 100");
80module_param(fake_buffer, bool, 0444);
81MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
82#ifdef CONFIG_HIGH_RES_TIMERS
83module_param(hrtimer, bool, 0644);
84MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
85#endif
86
87static struct platform_device *devices[SNDRV_CARDS];
88
89#define MIXER_ADDR_MASTER 0
90#define MIXER_ADDR_LINE 1
91#define MIXER_ADDR_MIC 2
92#define MIXER_ADDR_SYNTH 3
93#define MIXER_ADDR_CD 4
94#define MIXER_ADDR_LAST 4
95
96struct dummy_timer_ops {
97 int (*create)(struct snd_pcm_substream *);
98 void (*free)(struct snd_pcm_substream *);
99 int (*prepare)(struct snd_pcm_substream *);
100 int (*start)(struct snd_pcm_substream *);
101 int (*stop)(struct snd_pcm_substream *);
102 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
103};
104
105#define get_dummy_ops(substream) \
106 (*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
107
108struct dummy_model {
109 const char *name;
110 int (*playback_constraints)(struct snd_pcm_runtime *runtime);
111 int (*capture_constraints)(struct snd_pcm_runtime *runtime);
112 u64 formats;
113 size_t buffer_bytes_max;
114 size_t period_bytes_min;
115 size_t period_bytes_max;
116 unsigned int periods_min;
117 unsigned int periods_max;
118 unsigned int rates;
119 unsigned int rate_min;
120 unsigned int rate_max;
121 unsigned int channels_min;
122 unsigned int channels_max;
123};
124
125struct snd_dummy {
126 struct snd_card *card;
127 const struct dummy_model *model;
128 struct snd_pcm *pcm;
129 struct snd_pcm_hardware pcm_hw;
130 spinlock_t mixer_lock;
131 int mixer_volume[MIXER_ADDR_LAST+1][2];
132 int capture_source[MIXER_ADDR_LAST+1][2];
133 int iobox;
134 struct snd_kcontrol *cd_volume_ctl;
135 struct snd_kcontrol *cd_switch_ctl;
136};
137
138/*
139 * card models
140 */
141
142static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
143{
144 int err;
145 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
146 if (err < 0)
147 return err;
148 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
149 if (err < 0)
150 return err;
151 return 0;
152}
153
154static const struct dummy_model model_emu10k1 = {
155 .name = "emu10k1",
156 .playback_constraints = emu10k1_playback_constraints,
157 .buffer_bytes_max = 128 * 1024,
158};
159
160static const struct dummy_model model_rme9652 = {
161 .name = "rme9652",
162 .buffer_bytes_max = 26 * 64 * 1024,
163 .formats = SNDRV_PCM_FMTBIT_S32_LE,
164 .channels_min = 26,
165 .channels_max = 26,
166 .periods_min = 2,
167 .periods_max = 2,
168};
169
170static const struct dummy_model model_ice1712 = {
171 .name = "ice1712",
172 .buffer_bytes_max = 256 * 1024,
173 .formats = SNDRV_PCM_FMTBIT_S32_LE,
174 .channels_min = 10,
175 .channels_max = 10,
176 .periods_min = 1,
177 .periods_max = 1024,
178};
179
180static const struct dummy_model model_uda1341 = {
181 .name = "uda1341",
182 .buffer_bytes_max = 16380,
183 .formats = SNDRV_PCM_FMTBIT_S16_LE,
184 .channels_min = 2,
185 .channels_max = 2,
186 .periods_min = 2,
187 .periods_max = 255,
188};
189
190static const struct dummy_model model_ac97 = {
191 .name = "ac97",
192 .formats = SNDRV_PCM_FMTBIT_S16_LE,
193 .channels_min = 2,
194 .channels_max = 2,
195 .rates = SNDRV_PCM_RATE_48000,
196 .rate_min = 48000,
197 .rate_max = 48000,
198};
199
200static const struct dummy_model model_ca0106 = {
201 .name = "ca0106",
202 .formats = SNDRV_PCM_FMTBIT_S16_LE,
203 .buffer_bytes_max = ((65536-64)*8),
204 .period_bytes_max = (65536-64),
205 .periods_min = 2,
206 .periods_max = 8,
207 .channels_min = 2,
208 .channels_max = 2,
209 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
210 .rate_min = 48000,
211 .rate_max = 192000,
212};
213
214static const struct dummy_model *dummy_models[] = {
215 &model_emu10k1,
216 &model_rme9652,
217 &model_ice1712,
218 &model_uda1341,
219 &model_ac97,
220 &model_ca0106,
221 NULL
222};
223
224/*
225 * system timer interface
226 */
227
228struct dummy_systimer_pcm {
229 /* ops must be the first item */
230 const struct dummy_timer_ops *timer_ops;
231 spinlock_t lock;
232 struct timer_list timer;
233 unsigned long base_time;
234 unsigned int frac_pos; /* fractional sample position (based HZ) */
235 unsigned int frac_period_rest;
236 unsigned int frac_buffer_size; /* buffer_size * HZ */
237 unsigned int frac_period_size; /* period_size * HZ */
238 unsigned int rate;
239 int elapsed;
240 struct snd_pcm_substream *substream;
241};
242
243static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
244{
245 mod_timer(&dpcm->timer, jiffies +
246 DIV_ROUND_UP(dpcm->frac_period_rest, dpcm->rate));
247}
248
249static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
250{
251 unsigned long delta;
252
253 delta = jiffies - dpcm->base_time;
254 if (!delta)
255 return;
256 dpcm->base_time += delta;
257 delta *= dpcm->rate;
258 dpcm->frac_pos += delta;
259 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
260 dpcm->frac_pos -= dpcm->frac_buffer_size;
261 while (dpcm->frac_period_rest <= delta) {
262 dpcm->elapsed++;
263 dpcm->frac_period_rest += dpcm->frac_period_size;
264 }
265 dpcm->frac_period_rest -= delta;
266}
267
268static int dummy_systimer_start(struct snd_pcm_substream *substream)
269{
270 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
271 spin_lock(&dpcm->lock);
272 dpcm->base_time = jiffies;
273 dummy_systimer_rearm(dpcm);
274 spin_unlock(&dpcm->lock);
275 return 0;
276}
277
278static int dummy_systimer_stop(struct snd_pcm_substream *substream)
279{
280 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
281 spin_lock(&dpcm->lock);
282 del_timer(&dpcm->timer);
283 spin_unlock(&dpcm->lock);
284 return 0;
285}
286
287static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
288{
289 struct snd_pcm_runtime *runtime = substream->runtime;
290 struct dummy_systimer_pcm *dpcm = runtime->private_data;
291
292 dpcm->frac_pos = 0;
293 dpcm->rate = runtime->rate;
294 dpcm->frac_buffer_size = runtime->buffer_size * HZ;
295 dpcm->frac_period_size = runtime->period_size * HZ;
296 dpcm->frac_period_rest = dpcm->frac_period_size;
297 dpcm->elapsed = 0;
298
299 return 0;
300}
301
302static void dummy_systimer_callback(struct timer_list *t)
303{
304 struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer);
305 unsigned long flags;
306 int elapsed = 0;
307
308 spin_lock_irqsave(&dpcm->lock, flags);
309 dummy_systimer_update(dpcm);
310 dummy_systimer_rearm(dpcm);
311 elapsed = dpcm->elapsed;
312 dpcm->elapsed = 0;
313 spin_unlock_irqrestore(&dpcm->lock, flags);
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 snd_pcm_uframes_t pos;
323
324 spin_lock(&dpcm->lock);
325 dummy_systimer_update(dpcm);
326 pos = dpcm->frac_pos / HZ;
327 spin_unlock(&dpcm->lock);
328 return pos;
329}
330
331static int dummy_systimer_create(struct snd_pcm_substream *substream)
332{
333 struct dummy_systimer_pcm *dpcm;
334
335 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
336 if (!dpcm)
337 return -ENOMEM;
338 substream->runtime->private_data = dpcm;
339 timer_setup(&dpcm->timer, dummy_systimer_callback, 0);
340 spin_lock_init(&dpcm->lock);
341 dpcm->substream = substream;
342 return 0;
343}
344
345static void dummy_systimer_free(struct snd_pcm_substream *substream)
346{
347 kfree(substream->runtime->private_data);
348}
349
350static const struct dummy_timer_ops dummy_systimer_ops = {
351 .create = dummy_systimer_create,
352 .free = dummy_systimer_free,
353 .prepare = dummy_systimer_prepare,
354 .start = dummy_systimer_start,
355 .stop = dummy_systimer_stop,
356 .pointer = dummy_systimer_pointer,
357};
358
359#ifdef CONFIG_HIGH_RES_TIMERS
360/*
361 * hrtimer interface
362 */
363
364struct dummy_hrtimer_pcm {
365 /* ops must be the first item */
366 const struct dummy_timer_ops *timer_ops;
367 ktime_t base_time;
368 ktime_t period_time;
369 atomic_t running;
370 struct hrtimer timer;
371 struct snd_pcm_substream *substream;
372};
373
374static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
375{
376 struct dummy_hrtimer_pcm *dpcm;
377
378 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
379 if (!atomic_read(&dpcm->running))
380 return HRTIMER_NORESTART;
381 /*
382 * In cases of XRUN and draining, this calls .trigger to stop PCM
383 * substream.
384 */
385 snd_pcm_period_elapsed(dpcm->substream);
386 if (!atomic_read(&dpcm->running))
387 return HRTIMER_NORESTART;
388
389 hrtimer_forward_now(timer, dpcm->period_time);
390 return HRTIMER_RESTART;
391}
392
393static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
394{
395 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
396
397 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
398 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT);
399 atomic_set(&dpcm->running, 1);
400 return 0;
401}
402
403static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
404{
405 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
406
407 atomic_set(&dpcm->running, 0);
408 if (!hrtimer_callback_running(&dpcm->timer))
409 hrtimer_cancel(&dpcm->timer);
410 return 0;
411}
412
413static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
414{
415 hrtimer_cancel(&dpcm->timer);
416}
417
418static snd_pcm_uframes_t
419dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
420{
421 struct snd_pcm_runtime *runtime = substream->runtime;
422 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
423 u64 delta;
424 u32 pos;
425
426 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
427 dpcm->base_time);
428 delta = div_u64(delta * runtime->rate + 999999, 1000000);
429 div_u64_rem(delta, runtime->buffer_size, &pos);
430 return pos;
431}
432
433static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
434{
435 struct snd_pcm_runtime *runtime = substream->runtime;
436 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
437 unsigned int period, rate;
438 long sec;
439 unsigned long nsecs;
440
441 dummy_hrtimer_sync(dpcm);
442 period = runtime->period_size;
443 rate = runtime->rate;
444 sec = period / rate;
445 period %= rate;
446 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
447 dpcm->period_time = ktime_set(sec, nsecs);
448
449 return 0;
450}
451
452static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
453{
454 struct dummy_hrtimer_pcm *dpcm;
455
456 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
457 if (!dpcm)
458 return -ENOMEM;
459 substream->runtime->private_data = dpcm;
460 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
461 dpcm->timer.function = dummy_hrtimer_callback;
462 dpcm->substream = substream;
463 atomic_set(&dpcm->running, 0);
464 return 0;
465}
466
467static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
468{
469 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
470 dummy_hrtimer_sync(dpcm);
471 kfree(dpcm);
472}
473
474static const struct dummy_timer_ops dummy_hrtimer_ops = {
475 .create = dummy_hrtimer_create,
476 .free = dummy_hrtimer_free,
477 .prepare = dummy_hrtimer_prepare,
478 .start = dummy_hrtimer_start,
479 .stop = dummy_hrtimer_stop,
480 .pointer = dummy_hrtimer_pointer,
481};
482
483#endif /* CONFIG_HIGH_RES_TIMERS */
484
485/*
486 * PCM interface
487 */
488
489static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
490{
491 switch (cmd) {
492 case SNDRV_PCM_TRIGGER_START:
493 case SNDRV_PCM_TRIGGER_RESUME:
494 return get_dummy_ops(substream)->start(substream);
495 case SNDRV_PCM_TRIGGER_STOP:
496 case SNDRV_PCM_TRIGGER_SUSPEND:
497 return get_dummy_ops(substream)->stop(substream);
498 }
499 return -EINVAL;
500}
501
502static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
503{
504 return get_dummy_ops(substream)->prepare(substream);
505}
506
507static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
508{
509 return get_dummy_ops(substream)->pointer(substream);
510}
511
512static const struct snd_pcm_hardware dummy_pcm_hardware = {
513 .info = (SNDRV_PCM_INFO_MMAP |
514 SNDRV_PCM_INFO_INTERLEAVED |
515 SNDRV_PCM_INFO_RESUME |
516 SNDRV_PCM_INFO_MMAP_VALID),
517 .formats = USE_FORMATS,
518 .rates = USE_RATE,
519 .rate_min = USE_RATE_MIN,
520 .rate_max = USE_RATE_MAX,
521 .channels_min = USE_CHANNELS_MIN,
522 .channels_max = USE_CHANNELS_MAX,
523 .buffer_bytes_max = MAX_BUFFER_SIZE,
524 .period_bytes_min = MIN_PERIOD_SIZE,
525 .period_bytes_max = MAX_PERIOD_SIZE,
526 .periods_min = USE_PERIODS_MIN,
527 .periods_max = USE_PERIODS_MAX,
528 .fifo_size = 0,
529};
530
531static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
532 struct snd_pcm_hw_params *hw_params)
533{
534 if (fake_buffer) {
535 /* runtime->dma_bytes has to be set manually to allow mmap */
536 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
537 return 0;
538 }
539 return 0;
540}
541
542static int dummy_pcm_open(struct snd_pcm_substream *substream)
543{
544 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
545 const struct dummy_model *model = dummy->model;
546 struct snd_pcm_runtime *runtime = substream->runtime;
547 const struct dummy_timer_ops *ops;
548 int err;
549
550 ops = &dummy_systimer_ops;
551#ifdef CONFIG_HIGH_RES_TIMERS
552 if (hrtimer)
553 ops = &dummy_hrtimer_ops;
554#endif
555
556 err = ops->create(substream);
557 if (err < 0)
558 return err;
559 get_dummy_ops(substream) = ops;
560
561 runtime->hw = dummy->pcm_hw;
562 if (substream->pcm->device & 1) {
563 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
564 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
565 }
566 if (substream->pcm->device & 2)
567 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
568 SNDRV_PCM_INFO_MMAP_VALID);
569
570 if (model == NULL)
571 return 0;
572
573 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
574 if (model->playback_constraints)
575 err = model->playback_constraints(substream->runtime);
576 } else {
577 if (model->capture_constraints)
578 err = model->capture_constraints(substream->runtime);
579 }
580 if (err < 0) {
581 get_dummy_ops(substream)->free(substream);
582 return err;
583 }
584 return 0;
585}
586
587static int dummy_pcm_close(struct snd_pcm_substream *substream)
588{
589 get_dummy_ops(substream)->free(substream);
590 return 0;
591}
592
593/*
594 * dummy buffer handling
595 */
596
597static void *dummy_page[2];
598
599static void free_fake_buffer(void)
600{
601 if (fake_buffer) {
602 int i;
603 for (i = 0; i < 2; i++)
604 if (dummy_page[i]) {
605 free_page((unsigned long)dummy_page[i]);
606 dummy_page[i] = NULL;
607 }
608 }
609}
610
611static int alloc_fake_buffer(void)
612{
613 int i;
614
615 if (!fake_buffer)
616 return 0;
617 for (i = 0; i < 2; i++) {
618 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
619 if (!dummy_page[i]) {
620 free_fake_buffer();
621 return -ENOMEM;
622 }
623 }
624 return 0;
625}
626
627static int dummy_pcm_copy(struct snd_pcm_substream *substream,
628 int channel, unsigned long pos,
629 void __user *dst, unsigned long bytes)
630{
631 return 0; /* do nothing */
632}
633
634static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
635 int channel, unsigned long pos,
636 void *dst, unsigned long bytes)
637{
638 return 0; /* do nothing */
639}
640
641static int dummy_pcm_silence(struct snd_pcm_substream *substream,
642 int channel, unsigned long pos,
643 unsigned long bytes)
644{
645 return 0; /* do nothing */
646}
647
648static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
649 unsigned long offset)
650{
651 return virt_to_page(dummy_page[substream->stream]); /* the same page */
652}
653
654static const struct snd_pcm_ops dummy_pcm_ops = {
655 .open = dummy_pcm_open,
656 .close = dummy_pcm_close,
657 .hw_params = dummy_pcm_hw_params,
658 .prepare = dummy_pcm_prepare,
659 .trigger = dummy_pcm_trigger,
660 .pointer = dummy_pcm_pointer,
661};
662
663static const struct snd_pcm_ops dummy_pcm_ops_no_buf = {
664 .open = dummy_pcm_open,
665 .close = dummy_pcm_close,
666 .hw_params = dummy_pcm_hw_params,
667 .prepare = dummy_pcm_prepare,
668 .trigger = dummy_pcm_trigger,
669 .pointer = dummy_pcm_pointer,
670 .copy_user = dummy_pcm_copy,
671 .copy_kernel = dummy_pcm_copy_kernel,
672 .fill_silence = dummy_pcm_silence,
673 .page = dummy_pcm_page,
674};
675
676static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
677 int substreams)
678{
679 struct snd_pcm *pcm;
680 const struct snd_pcm_ops *ops;
681 int err;
682
683 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
684 substreams, substreams, &pcm);
685 if (err < 0)
686 return err;
687 dummy->pcm = pcm;
688 if (fake_buffer)
689 ops = &dummy_pcm_ops_no_buf;
690 else
691 ops = &dummy_pcm_ops;
692 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
693 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
694 pcm->private_data = dummy;
695 pcm->info_flags = 0;
696 strcpy(pcm->name, "Dummy PCM");
697 if (!fake_buffer) {
698 snd_pcm_set_managed_buffer_all(pcm,
699 SNDRV_DMA_TYPE_CONTINUOUS,
700 NULL,
701 0, 64*1024);
702 }
703 return 0;
704}
705
706/*
707 * mixer interface
708 */
709
710#define DUMMY_VOLUME(xname, xindex, addr) \
711{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
712 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
713 .name = xname, .index = xindex, \
714 .info = snd_dummy_volume_info, \
715 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
716 .private_value = addr, \
717 .tlv = { .p = db_scale_dummy } }
718
719static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
720 struct snd_ctl_elem_info *uinfo)
721{
722 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
723 uinfo->count = 2;
724 uinfo->value.integer.min = mixer_volume_level_min;
725 uinfo->value.integer.max = mixer_volume_level_max;
726 return 0;
727}
728
729static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
730 struct snd_ctl_elem_value *ucontrol)
731{
732 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
733 int addr = kcontrol->private_value;
734
735 spin_lock_irq(&dummy->mixer_lock);
736 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
737 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
738 spin_unlock_irq(&dummy->mixer_lock);
739 return 0;
740}
741
742static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
743 struct snd_ctl_elem_value *ucontrol)
744{
745 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
746 int change, addr = kcontrol->private_value;
747 int left, right;
748
749 left = ucontrol->value.integer.value[0];
750 if (left < mixer_volume_level_min)
751 left = mixer_volume_level_min;
752 if (left > mixer_volume_level_max)
753 left = mixer_volume_level_max;
754 right = ucontrol->value.integer.value[1];
755 if (right < mixer_volume_level_min)
756 right = mixer_volume_level_min;
757 if (right > mixer_volume_level_max)
758 right = mixer_volume_level_max;
759 spin_lock_irq(&dummy->mixer_lock);
760 change = dummy->mixer_volume[addr][0] != left ||
761 dummy->mixer_volume[addr][1] != right;
762 dummy->mixer_volume[addr][0] = left;
763 dummy->mixer_volume[addr][1] = right;
764 spin_unlock_irq(&dummy->mixer_lock);
765 return change;
766}
767
768static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
769
770#define DUMMY_CAPSRC(xname, xindex, addr) \
771{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
772 .info = snd_dummy_capsrc_info, \
773 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
774 .private_value = addr }
775
776#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
777
778static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
779 struct snd_ctl_elem_value *ucontrol)
780{
781 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
782 int addr = kcontrol->private_value;
783
784 spin_lock_irq(&dummy->mixer_lock);
785 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
786 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
787 spin_unlock_irq(&dummy->mixer_lock);
788 return 0;
789}
790
791static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
792{
793 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
794 int change, addr = kcontrol->private_value;
795 int left, right;
796
797 left = ucontrol->value.integer.value[0] & 1;
798 right = ucontrol->value.integer.value[1] & 1;
799 spin_lock_irq(&dummy->mixer_lock);
800 change = dummy->capture_source[addr][0] != left &&
801 dummy->capture_source[addr][1] != right;
802 dummy->capture_source[addr][0] = left;
803 dummy->capture_source[addr][1] = right;
804 spin_unlock_irq(&dummy->mixer_lock);
805 return change;
806}
807
808static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
809 struct snd_ctl_elem_info *info)
810{
811 static const char *const names[] = { "None", "CD Player" };
812
813 return snd_ctl_enum_info(info, 1, 2, names);
814}
815
816static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
817 struct snd_ctl_elem_value *value)
818{
819 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
820
821 value->value.enumerated.item[0] = dummy->iobox;
822 return 0;
823}
824
825static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
826 struct snd_ctl_elem_value *value)
827{
828 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
829 int changed;
830
831 if (value->value.enumerated.item[0] > 1)
832 return -EINVAL;
833
834 changed = value->value.enumerated.item[0] != dummy->iobox;
835 if (changed) {
836 dummy->iobox = value->value.enumerated.item[0];
837
838 if (dummy->iobox) {
839 dummy->cd_volume_ctl->vd[0].access &=
840 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
841 dummy->cd_switch_ctl->vd[0].access &=
842 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
843 } else {
844 dummy->cd_volume_ctl->vd[0].access |=
845 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
846 dummy->cd_switch_ctl->vd[0].access |=
847 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
848 }
849
850 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
851 &dummy->cd_volume_ctl->id);
852 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
853 &dummy->cd_switch_ctl->id);
854 }
855
856 return changed;
857}
858
859static const struct snd_kcontrol_new snd_dummy_controls[] = {
860DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
861DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
862DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
863DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
864DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
865DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
866DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
867DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
868DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
869DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
870{
871 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
872 .name = "External I/O Box",
873 .info = snd_dummy_iobox_info,
874 .get = snd_dummy_iobox_get,
875 .put = snd_dummy_iobox_put,
876},
877};
878
879static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
880{
881 struct snd_card *card = dummy->card;
882 struct snd_kcontrol *kcontrol;
883 unsigned int idx;
884 int err;
885
886 spin_lock_init(&dummy->mixer_lock);
887 strcpy(card->mixername, "Dummy Mixer");
888 dummy->iobox = 1;
889
890 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
891 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
892 err = snd_ctl_add(card, kcontrol);
893 if (err < 0)
894 return err;
895 if (!strcmp(kcontrol->id.name, "CD Volume"))
896 dummy->cd_volume_ctl = kcontrol;
897 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
898 dummy->cd_switch_ctl = kcontrol;
899
900 }
901 return 0;
902}
903
904#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
905/*
906 * proc interface
907 */
908static void print_formats(struct snd_dummy *dummy,
909 struct snd_info_buffer *buffer)
910{
911 snd_pcm_format_t i;
912
913 pcm_for_each_format(i) {
914 if (dummy->pcm_hw.formats & pcm_format_to_bits(i))
915 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
916 }
917}
918
919static void print_rates(struct snd_dummy *dummy,
920 struct snd_info_buffer *buffer)
921{
922 static const int rates[] = {
923 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
924 64000, 88200, 96000, 176400, 192000,
925 };
926 int i;
927
928 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
929 snd_iprintf(buffer, " continuous");
930 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
931 snd_iprintf(buffer, " knot");
932 for (i = 0; i < ARRAY_SIZE(rates); i++)
933 if (dummy->pcm_hw.rates & (1 << i))
934 snd_iprintf(buffer, " %d", rates[i]);
935}
936
937#define get_dummy_int_ptr(dummy, ofs) \
938 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
939#define get_dummy_ll_ptr(dummy, ofs) \
940 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
941
942struct dummy_hw_field {
943 const char *name;
944 const char *format;
945 unsigned int offset;
946 unsigned int size;
947};
948#define FIELD_ENTRY(item, fmt) { \
949 .name = #item, \
950 .format = fmt, \
951 .offset = offsetof(struct snd_pcm_hardware, item), \
952 .size = sizeof(dummy_pcm_hardware.item) }
953
954static const struct dummy_hw_field fields[] = {
955 FIELD_ENTRY(formats, "%#llx"),
956 FIELD_ENTRY(rates, "%#x"),
957 FIELD_ENTRY(rate_min, "%d"),
958 FIELD_ENTRY(rate_max, "%d"),
959 FIELD_ENTRY(channels_min, "%d"),
960 FIELD_ENTRY(channels_max, "%d"),
961 FIELD_ENTRY(buffer_bytes_max, "%ld"),
962 FIELD_ENTRY(period_bytes_min, "%ld"),
963 FIELD_ENTRY(period_bytes_max, "%ld"),
964 FIELD_ENTRY(periods_min, "%d"),
965 FIELD_ENTRY(periods_max, "%d"),
966};
967
968static void dummy_proc_read(struct snd_info_entry *entry,
969 struct snd_info_buffer *buffer)
970{
971 struct snd_dummy *dummy = entry->private_data;
972 int i;
973
974 for (i = 0; i < ARRAY_SIZE(fields); i++) {
975 snd_iprintf(buffer, "%s ", fields[i].name);
976 if (fields[i].size == sizeof(int))
977 snd_iprintf(buffer, fields[i].format,
978 *get_dummy_int_ptr(dummy, fields[i].offset));
979 else
980 snd_iprintf(buffer, fields[i].format,
981 *get_dummy_ll_ptr(dummy, fields[i].offset));
982 if (!strcmp(fields[i].name, "formats"))
983 print_formats(dummy, buffer);
984 else if (!strcmp(fields[i].name, "rates"))
985 print_rates(dummy, buffer);
986 snd_iprintf(buffer, "\n");
987 }
988}
989
990static void dummy_proc_write(struct snd_info_entry *entry,
991 struct snd_info_buffer *buffer)
992{
993 struct snd_dummy *dummy = entry->private_data;
994 char line[64];
995
996 while (!snd_info_get_line(buffer, line, sizeof(line))) {
997 char item[20];
998 const char *ptr;
999 unsigned long long val;
1000 int i;
1001
1002 ptr = snd_info_get_str(item, line, sizeof(item));
1003 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1004 if (!strcmp(item, fields[i].name))
1005 break;
1006 }
1007 if (i >= ARRAY_SIZE(fields))
1008 continue;
1009 snd_info_get_str(item, ptr, sizeof(item));
1010 if (kstrtoull(item, 0, &val))
1011 continue;
1012 if (fields[i].size == sizeof(int))
1013 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1014 else
1015 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1016 }
1017}
1018
1019static void dummy_proc_init(struct snd_dummy *chip)
1020{
1021 snd_card_rw_proc_new(chip->card, "dummy_pcm", chip,
1022 dummy_proc_read, dummy_proc_write);
1023}
1024#else
1025#define dummy_proc_init(x)
1026#endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1027
1028static int snd_dummy_probe(struct platform_device *devptr)
1029{
1030 struct snd_card *card;
1031 struct snd_dummy *dummy;
1032 const struct dummy_model *m = NULL, **mdl;
1033 int idx, err;
1034 int dev = devptr->id;
1035
1036 err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1037 sizeof(struct snd_dummy), &card);
1038 if (err < 0)
1039 return err;
1040 dummy = card->private_data;
1041 dummy->card = card;
1042 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1043 if (strcmp(model[dev], (*mdl)->name) == 0) {
1044 printk(KERN_INFO
1045 "snd-dummy: Using model '%s' for card %i\n",
1046 (*mdl)->name, card->number);
1047 m = dummy->model = *mdl;
1048 break;
1049 }
1050 }
1051 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1052 if (pcm_substreams[dev] < 1)
1053 pcm_substreams[dev] = 1;
1054 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1055 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1056 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1057 if (err < 0)
1058 return err;
1059 }
1060
1061 dummy->pcm_hw = dummy_pcm_hardware;
1062 if (m) {
1063 if (m->formats)
1064 dummy->pcm_hw.formats = m->formats;
1065 if (m->buffer_bytes_max)
1066 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1067 if (m->period_bytes_min)
1068 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1069 if (m->period_bytes_max)
1070 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1071 if (m->periods_min)
1072 dummy->pcm_hw.periods_min = m->periods_min;
1073 if (m->periods_max)
1074 dummy->pcm_hw.periods_max = m->periods_max;
1075 if (m->rates)
1076 dummy->pcm_hw.rates = m->rates;
1077 if (m->rate_min)
1078 dummy->pcm_hw.rate_min = m->rate_min;
1079 if (m->rate_max)
1080 dummy->pcm_hw.rate_max = m->rate_max;
1081 if (m->channels_min)
1082 dummy->pcm_hw.channels_min = m->channels_min;
1083 if (m->channels_max)
1084 dummy->pcm_hw.channels_max = m->channels_max;
1085 }
1086
1087 if (mixer_volume_level_min > mixer_volume_level_max) {
1088 pr_warn("snd-dummy: Invalid mixer volume level: min=%d, max=%d. Fall back to default value.\n",
1089 mixer_volume_level_min, mixer_volume_level_max);
1090 mixer_volume_level_min = USE_MIXER_VOLUME_LEVEL_MIN;
1091 mixer_volume_level_max = USE_MIXER_VOLUME_LEVEL_MAX;
1092 }
1093 err = snd_card_dummy_new_mixer(dummy);
1094 if (err < 0)
1095 return err;
1096 strcpy(card->driver, "Dummy");
1097 strcpy(card->shortname, "Dummy");
1098 sprintf(card->longname, "Dummy %i", dev + 1);
1099
1100 dummy_proc_init(dummy);
1101
1102 err = snd_card_register(card);
1103 if (err < 0)
1104 return err;
1105 platform_set_drvdata(devptr, card);
1106 return 0;
1107}
1108
1109#ifdef CONFIG_PM_SLEEP
1110static int snd_dummy_suspend(struct device *pdev)
1111{
1112 struct snd_card *card = dev_get_drvdata(pdev);
1113
1114 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1115 return 0;
1116}
1117
1118static int snd_dummy_resume(struct device *pdev)
1119{
1120 struct snd_card *card = dev_get_drvdata(pdev);
1121
1122 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1123 return 0;
1124}
1125
1126static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1127#define SND_DUMMY_PM_OPS &snd_dummy_pm
1128#else
1129#define SND_DUMMY_PM_OPS NULL
1130#endif
1131
1132#define SND_DUMMY_DRIVER "snd_dummy"
1133
1134static struct platform_driver snd_dummy_driver = {
1135 .probe = snd_dummy_probe,
1136 .driver = {
1137 .name = SND_DUMMY_DRIVER,
1138 .pm = SND_DUMMY_PM_OPS,
1139 },
1140};
1141
1142static void snd_dummy_unregister_all(void)
1143{
1144 int i;
1145
1146 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1147 platform_device_unregister(devices[i]);
1148 platform_driver_unregister(&snd_dummy_driver);
1149 free_fake_buffer();
1150}
1151
1152static int __init alsa_card_dummy_init(void)
1153{
1154 int i, cards, err;
1155
1156 err = platform_driver_register(&snd_dummy_driver);
1157 if (err < 0)
1158 return err;
1159
1160 err = alloc_fake_buffer();
1161 if (err < 0) {
1162 platform_driver_unregister(&snd_dummy_driver);
1163 return err;
1164 }
1165
1166 cards = 0;
1167 for (i = 0; i < SNDRV_CARDS; i++) {
1168 struct platform_device *device;
1169 if (! enable[i])
1170 continue;
1171 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1172 i, NULL, 0);
1173 if (IS_ERR(device))
1174 continue;
1175 if (!platform_get_drvdata(device)) {
1176 platform_device_unregister(device);
1177 continue;
1178 }
1179 devices[i] = device;
1180 cards++;
1181 }
1182 if (!cards) {
1183#ifdef MODULE
1184 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1185#endif
1186 snd_dummy_unregister_all();
1187 return -ENODEV;
1188 }
1189 return 0;
1190}
1191
1192static void __exit alsa_card_dummy_exit(void)
1193{
1194 snd_dummy_unregister_all();
1195}
1196
1197module_init(alsa_card_dummy_init)
1198module_exit(alsa_card_dummy_exit)
1/*
2 * Dummy soundcard
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21#include <linux/init.h>
22#include <linux/err.h>
23#include <linux/platform_device.h>
24#include <linux/jiffies.h>
25#include <linux/slab.h>
26#include <linux/time.h>
27#include <linux/wait.h>
28#include <linux/hrtimer.h>
29#include <linux/math64.h>
30#include <linux/module.h>
31#include <sound/core.h>
32#include <sound/control.h>
33#include <sound/tlv.h>
34#include <sound/pcm.h>
35#include <sound/rawmidi.h>
36#include <sound/info.h>
37#include <sound/initval.h>
38
39MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
40MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
41MODULE_LICENSE("GPL");
42MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
43
44#define MAX_PCM_DEVICES 4
45#define MAX_PCM_SUBSTREAMS 128
46#define MAX_MIDI_DEVICES 2
47
48/* defaults */
49#define MAX_BUFFER_SIZE (64*1024)
50#define MIN_PERIOD_SIZE 64
51#define MAX_PERIOD_SIZE MAX_BUFFER_SIZE
52#define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
53#define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
54#define USE_RATE_MIN 5500
55#define USE_RATE_MAX 48000
56#define USE_CHANNELS_MIN 1
57#define USE_CHANNELS_MAX 2
58#define USE_PERIODS_MIN 1
59#define USE_PERIODS_MAX 1024
60
61static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
62static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
63static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
64static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
65static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
66static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
67//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
68#ifdef CONFIG_HIGH_RES_TIMERS
69static bool hrtimer = 1;
70#endif
71static bool fake_buffer = 1;
72
73module_param_array(index, int, NULL, 0444);
74MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
75module_param_array(id, charp, NULL, 0444);
76MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
77module_param_array(enable, bool, NULL, 0444);
78MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
79module_param_array(model, charp, NULL, 0444);
80MODULE_PARM_DESC(model, "Soundcard model.");
81module_param_array(pcm_devs, int, NULL, 0444);
82MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
83module_param_array(pcm_substreams, int, NULL, 0444);
84MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
85//module_param_array(midi_devs, int, NULL, 0444);
86//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
87module_param(fake_buffer, bool, 0444);
88MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
89#ifdef CONFIG_HIGH_RES_TIMERS
90module_param(hrtimer, bool, 0644);
91MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
92#endif
93
94static struct platform_device *devices[SNDRV_CARDS];
95
96#define MIXER_ADDR_MASTER 0
97#define MIXER_ADDR_LINE 1
98#define MIXER_ADDR_MIC 2
99#define MIXER_ADDR_SYNTH 3
100#define MIXER_ADDR_CD 4
101#define MIXER_ADDR_LAST 4
102
103struct dummy_timer_ops {
104 int (*create)(struct snd_pcm_substream *);
105 void (*free)(struct snd_pcm_substream *);
106 int (*prepare)(struct snd_pcm_substream *);
107 int (*start)(struct snd_pcm_substream *);
108 int (*stop)(struct snd_pcm_substream *);
109 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
110};
111
112#define get_dummy_ops(substream) \
113 (*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
114
115struct dummy_model {
116 const char *name;
117 int (*playback_constraints)(struct snd_pcm_runtime *runtime);
118 int (*capture_constraints)(struct snd_pcm_runtime *runtime);
119 u64 formats;
120 size_t buffer_bytes_max;
121 size_t period_bytes_min;
122 size_t period_bytes_max;
123 unsigned int periods_min;
124 unsigned int periods_max;
125 unsigned int rates;
126 unsigned int rate_min;
127 unsigned int rate_max;
128 unsigned int channels_min;
129 unsigned int channels_max;
130};
131
132struct snd_dummy {
133 struct snd_card *card;
134 struct dummy_model *model;
135 struct snd_pcm *pcm;
136 struct snd_pcm_hardware pcm_hw;
137 spinlock_t mixer_lock;
138 int mixer_volume[MIXER_ADDR_LAST+1][2];
139 int capture_source[MIXER_ADDR_LAST+1][2];
140 int iobox;
141 struct snd_kcontrol *cd_volume_ctl;
142 struct snd_kcontrol *cd_switch_ctl;
143};
144
145/*
146 * card models
147 */
148
149static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
150{
151 int err;
152 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
153 if (err < 0)
154 return err;
155 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
156 if (err < 0)
157 return err;
158 return 0;
159}
160
161static struct dummy_model model_emu10k1 = {
162 .name = "emu10k1",
163 .playback_constraints = emu10k1_playback_constraints,
164 .buffer_bytes_max = 128 * 1024,
165};
166
167static struct dummy_model model_rme9652 = {
168 .name = "rme9652",
169 .buffer_bytes_max = 26 * 64 * 1024,
170 .formats = SNDRV_PCM_FMTBIT_S32_LE,
171 .channels_min = 26,
172 .channels_max = 26,
173 .periods_min = 2,
174 .periods_max = 2,
175};
176
177static struct dummy_model model_ice1712 = {
178 .name = "ice1712",
179 .buffer_bytes_max = 256 * 1024,
180 .formats = SNDRV_PCM_FMTBIT_S32_LE,
181 .channels_min = 10,
182 .channels_max = 10,
183 .periods_min = 1,
184 .periods_max = 1024,
185};
186
187static struct dummy_model model_uda1341 = {
188 .name = "uda1341",
189 .buffer_bytes_max = 16380,
190 .formats = SNDRV_PCM_FMTBIT_S16_LE,
191 .channels_min = 2,
192 .channels_max = 2,
193 .periods_min = 2,
194 .periods_max = 255,
195};
196
197static struct dummy_model model_ac97 = {
198 .name = "ac97",
199 .formats = SNDRV_PCM_FMTBIT_S16_LE,
200 .channels_min = 2,
201 .channels_max = 2,
202 .rates = SNDRV_PCM_RATE_48000,
203 .rate_min = 48000,
204 .rate_max = 48000,
205};
206
207static struct dummy_model model_ca0106 = {
208 .name = "ca0106",
209 .formats = SNDRV_PCM_FMTBIT_S16_LE,
210 .buffer_bytes_max = ((65536-64)*8),
211 .period_bytes_max = (65536-64),
212 .periods_min = 2,
213 .periods_max = 8,
214 .channels_min = 2,
215 .channels_max = 2,
216 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
217 .rate_min = 48000,
218 .rate_max = 192000,
219};
220
221static struct dummy_model *dummy_models[] = {
222 &model_emu10k1,
223 &model_rme9652,
224 &model_ice1712,
225 &model_uda1341,
226 &model_ac97,
227 &model_ca0106,
228 NULL
229};
230
231/*
232 * system timer interface
233 */
234
235struct dummy_systimer_pcm {
236 /* ops must be the first item */
237 const struct dummy_timer_ops *timer_ops;
238 spinlock_t lock;
239 struct timer_list timer;
240 unsigned long base_time;
241 unsigned int frac_pos; /* fractional sample position (based HZ) */
242 unsigned int frac_period_rest;
243 unsigned int frac_buffer_size; /* buffer_size * HZ */
244 unsigned int frac_period_size; /* period_size * HZ */
245 unsigned int rate;
246 int elapsed;
247 struct snd_pcm_substream *substream;
248};
249
250static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
251{
252 mod_timer(&dpcm->timer, jiffies +
253 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
254}
255
256static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
257{
258 unsigned long delta;
259
260 delta = jiffies - dpcm->base_time;
261 if (!delta)
262 return;
263 dpcm->base_time += delta;
264 delta *= dpcm->rate;
265 dpcm->frac_pos += delta;
266 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
267 dpcm->frac_pos -= dpcm->frac_buffer_size;
268 while (dpcm->frac_period_rest <= delta) {
269 dpcm->elapsed++;
270 dpcm->frac_period_rest += dpcm->frac_period_size;
271 }
272 dpcm->frac_period_rest -= delta;
273}
274
275static int dummy_systimer_start(struct snd_pcm_substream *substream)
276{
277 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
278 spin_lock(&dpcm->lock);
279 dpcm->base_time = jiffies;
280 dummy_systimer_rearm(dpcm);
281 spin_unlock(&dpcm->lock);
282 return 0;
283}
284
285static int dummy_systimer_stop(struct snd_pcm_substream *substream)
286{
287 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
288 spin_lock(&dpcm->lock);
289 del_timer(&dpcm->timer);
290 spin_unlock(&dpcm->lock);
291 return 0;
292}
293
294static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
295{
296 struct snd_pcm_runtime *runtime = substream->runtime;
297 struct dummy_systimer_pcm *dpcm = runtime->private_data;
298
299 dpcm->frac_pos = 0;
300 dpcm->rate = runtime->rate;
301 dpcm->frac_buffer_size = runtime->buffer_size * HZ;
302 dpcm->frac_period_size = runtime->period_size * HZ;
303 dpcm->frac_period_rest = dpcm->frac_period_size;
304 dpcm->elapsed = 0;
305
306 return 0;
307}
308
309static void dummy_systimer_callback(struct timer_list *t)
310{
311 struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer);
312 unsigned long flags;
313 int elapsed = 0;
314
315 spin_lock_irqsave(&dpcm->lock, flags);
316 dummy_systimer_update(dpcm);
317 dummy_systimer_rearm(dpcm);
318 elapsed = dpcm->elapsed;
319 dpcm->elapsed = 0;
320 spin_unlock_irqrestore(&dpcm->lock, flags);
321 if (elapsed)
322 snd_pcm_period_elapsed(dpcm->substream);
323}
324
325static snd_pcm_uframes_t
326dummy_systimer_pointer(struct snd_pcm_substream *substream)
327{
328 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
329 snd_pcm_uframes_t pos;
330
331 spin_lock(&dpcm->lock);
332 dummy_systimer_update(dpcm);
333 pos = dpcm->frac_pos / HZ;
334 spin_unlock(&dpcm->lock);
335 return pos;
336}
337
338static int dummy_systimer_create(struct snd_pcm_substream *substream)
339{
340 struct dummy_systimer_pcm *dpcm;
341
342 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
343 if (!dpcm)
344 return -ENOMEM;
345 substream->runtime->private_data = dpcm;
346 timer_setup(&dpcm->timer, dummy_systimer_callback, 0);
347 spin_lock_init(&dpcm->lock);
348 dpcm->substream = substream;
349 return 0;
350}
351
352static void dummy_systimer_free(struct snd_pcm_substream *substream)
353{
354 kfree(substream->runtime->private_data);
355}
356
357static const struct dummy_timer_ops dummy_systimer_ops = {
358 .create = dummy_systimer_create,
359 .free = dummy_systimer_free,
360 .prepare = dummy_systimer_prepare,
361 .start = dummy_systimer_start,
362 .stop = dummy_systimer_stop,
363 .pointer = dummy_systimer_pointer,
364};
365
366#ifdef CONFIG_HIGH_RES_TIMERS
367/*
368 * hrtimer interface
369 */
370
371struct dummy_hrtimer_pcm {
372 /* ops must be the first item */
373 const struct dummy_timer_ops *timer_ops;
374 ktime_t base_time;
375 ktime_t period_time;
376 atomic_t running;
377 struct hrtimer timer;
378 struct snd_pcm_substream *substream;
379};
380
381static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
382{
383 struct dummy_hrtimer_pcm *dpcm;
384
385 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
386 if (!atomic_read(&dpcm->running))
387 return HRTIMER_NORESTART;
388 /*
389 * In cases of XRUN and draining, this calls .trigger to stop PCM
390 * substream.
391 */
392 snd_pcm_period_elapsed(dpcm->substream);
393 if (!atomic_read(&dpcm->running))
394 return HRTIMER_NORESTART;
395
396 hrtimer_forward_now(timer, dpcm->period_time);
397 return HRTIMER_RESTART;
398}
399
400static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
401{
402 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
403
404 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
405 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT);
406 atomic_set(&dpcm->running, 1);
407 return 0;
408}
409
410static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
411{
412 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
413
414 atomic_set(&dpcm->running, 0);
415 if (!hrtimer_callback_running(&dpcm->timer))
416 hrtimer_cancel(&dpcm->timer);
417 return 0;
418}
419
420static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
421{
422 hrtimer_cancel(&dpcm->timer);
423}
424
425static snd_pcm_uframes_t
426dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
427{
428 struct snd_pcm_runtime *runtime = substream->runtime;
429 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
430 u64 delta;
431 u32 pos;
432
433 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
434 dpcm->base_time);
435 delta = div_u64(delta * runtime->rate + 999999, 1000000);
436 div_u64_rem(delta, runtime->buffer_size, &pos);
437 return pos;
438}
439
440static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
441{
442 struct snd_pcm_runtime *runtime = substream->runtime;
443 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
444 unsigned int period, rate;
445 long sec;
446 unsigned long nsecs;
447
448 dummy_hrtimer_sync(dpcm);
449 period = runtime->period_size;
450 rate = runtime->rate;
451 sec = period / rate;
452 period %= rate;
453 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
454 dpcm->period_time = ktime_set(sec, nsecs);
455
456 return 0;
457}
458
459static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
460{
461 struct dummy_hrtimer_pcm *dpcm;
462
463 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
464 if (!dpcm)
465 return -ENOMEM;
466 substream->runtime->private_data = dpcm;
467 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
468 dpcm->timer.function = dummy_hrtimer_callback;
469 dpcm->substream = substream;
470 atomic_set(&dpcm->running, 0);
471 return 0;
472}
473
474static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
475{
476 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
477 dummy_hrtimer_sync(dpcm);
478 kfree(dpcm);
479}
480
481static const struct dummy_timer_ops dummy_hrtimer_ops = {
482 .create = dummy_hrtimer_create,
483 .free = dummy_hrtimer_free,
484 .prepare = dummy_hrtimer_prepare,
485 .start = dummy_hrtimer_start,
486 .stop = dummy_hrtimer_stop,
487 .pointer = dummy_hrtimer_pointer,
488};
489
490#endif /* CONFIG_HIGH_RES_TIMERS */
491
492/*
493 * PCM interface
494 */
495
496static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
497{
498 switch (cmd) {
499 case SNDRV_PCM_TRIGGER_START:
500 case SNDRV_PCM_TRIGGER_RESUME:
501 return get_dummy_ops(substream)->start(substream);
502 case SNDRV_PCM_TRIGGER_STOP:
503 case SNDRV_PCM_TRIGGER_SUSPEND:
504 return get_dummy_ops(substream)->stop(substream);
505 }
506 return -EINVAL;
507}
508
509static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
510{
511 return get_dummy_ops(substream)->prepare(substream);
512}
513
514static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
515{
516 return get_dummy_ops(substream)->pointer(substream);
517}
518
519static const struct snd_pcm_hardware dummy_pcm_hardware = {
520 .info = (SNDRV_PCM_INFO_MMAP |
521 SNDRV_PCM_INFO_INTERLEAVED |
522 SNDRV_PCM_INFO_RESUME |
523 SNDRV_PCM_INFO_MMAP_VALID),
524 .formats = USE_FORMATS,
525 .rates = USE_RATE,
526 .rate_min = USE_RATE_MIN,
527 .rate_max = USE_RATE_MAX,
528 .channels_min = USE_CHANNELS_MIN,
529 .channels_max = USE_CHANNELS_MAX,
530 .buffer_bytes_max = MAX_BUFFER_SIZE,
531 .period_bytes_min = MIN_PERIOD_SIZE,
532 .period_bytes_max = MAX_PERIOD_SIZE,
533 .periods_min = USE_PERIODS_MIN,
534 .periods_max = USE_PERIODS_MAX,
535 .fifo_size = 0,
536};
537
538static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
539 struct snd_pcm_hw_params *hw_params)
540{
541 if (fake_buffer) {
542 /* runtime->dma_bytes has to be set manually to allow mmap */
543 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
544 return 0;
545 }
546 return snd_pcm_lib_malloc_pages(substream,
547 params_buffer_bytes(hw_params));
548}
549
550static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
551{
552 if (fake_buffer)
553 return 0;
554 return snd_pcm_lib_free_pages(substream);
555}
556
557static int dummy_pcm_open(struct snd_pcm_substream *substream)
558{
559 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
560 struct dummy_model *model = dummy->model;
561 struct snd_pcm_runtime *runtime = substream->runtime;
562 const struct dummy_timer_ops *ops;
563 int err;
564
565 ops = &dummy_systimer_ops;
566#ifdef CONFIG_HIGH_RES_TIMERS
567 if (hrtimer)
568 ops = &dummy_hrtimer_ops;
569#endif
570
571 err = ops->create(substream);
572 if (err < 0)
573 return err;
574 get_dummy_ops(substream) = ops;
575
576 runtime->hw = dummy->pcm_hw;
577 if (substream->pcm->device & 1) {
578 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
579 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
580 }
581 if (substream->pcm->device & 2)
582 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
583 SNDRV_PCM_INFO_MMAP_VALID);
584
585 if (model == NULL)
586 return 0;
587
588 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
589 if (model->playback_constraints)
590 err = model->playback_constraints(substream->runtime);
591 } else {
592 if (model->capture_constraints)
593 err = model->capture_constraints(substream->runtime);
594 }
595 if (err < 0) {
596 get_dummy_ops(substream)->free(substream);
597 return err;
598 }
599 return 0;
600}
601
602static int dummy_pcm_close(struct snd_pcm_substream *substream)
603{
604 get_dummy_ops(substream)->free(substream);
605 return 0;
606}
607
608/*
609 * dummy buffer handling
610 */
611
612static void *dummy_page[2];
613
614static void free_fake_buffer(void)
615{
616 if (fake_buffer) {
617 int i;
618 for (i = 0; i < 2; i++)
619 if (dummy_page[i]) {
620 free_page((unsigned long)dummy_page[i]);
621 dummy_page[i] = NULL;
622 }
623 }
624}
625
626static int alloc_fake_buffer(void)
627{
628 int i;
629
630 if (!fake_buffer)
631 return 0;
632 for (i = 0; i < 2; i++) {
633 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
634 if (!dummy_page[i]) {
635 free_fake_buffer();
636 return -ENOMEM;
637 }
638 }
639 return 0;
640}
641
642static int dummy_pcm_copy(struct snd_pcm_substream *substream,
643 int channel, unsigned long pos,
644 void __user *dst, unsigned long bytes)
645{
646 return 0; /* do nothing */
647}
648
649static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
650 int channel, unsigned long pos,
651 void *dst, unsigned long bytes)
652{
653 return 0; /* do nothing */
654}
655
656static int dummy_pcm_silence(struct snd_pcm_substream *substream,
657 int channel, unsigned long pos,
658 unsigned long bytes)
659{
660 return 0; /* do nothing */
661}
662
663static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
664 unsigned long offset)
665{
666 return virt_to_page(dummy_page[substream->stream]); /* the same page */
667}
668
669static struct snd_pcm_ops dummy_pcm_ops = {
670 .open = dummy_pcm_open,
671 .close = dummy_pcm_close,
672 .ioctl = snd_pcm_lib_ioctl,
673 .hw_params = dummy_pcm_hw_params,
674 .hw_free = dummy_pcm_hw_free,
675 .prepare = dummy_pcm_prepare,
676 .trigger = dummy_pcm_trigger,
677 .pointer = dummy_pcm_pointer,
678};
679
680static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
681 .open = dummy_pcm_open,
682 .close = dummy_pcm_close,
683 .ioctl = snd_pcm_lib_ioctl,
684 .hw_params = dummy_pcm_hw_params,
685 .hw_free = dummy_pcm_hw_free,
686 .prepare = dummy_pcm_prepare,
687 .trigger = dummy_pcm_trigger,
688 .pointer = dummy_pcm_pointer,
689 .copy_user = dummy_pcm_copy,
690 .copy_kernel = dummy_pcm_copy_kernel,
691 .fill_silence = dummy_pcm_silence,
692 .page = dummy_pcm_page,
693};
694
695static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
696 int substreams)
697{
698 struct snd_pcm *pcm;
699 struct snd_pcm_ops *ops;
700 int err;
701
702 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
703 substreams, substreams, &pcm);
704 if (err < 0)
705 return err;
706 dummy->pcm = pcm;
707 if (fake_buffer)
708 ops = &dummy_pcm_ops_no_buf;
709 else
710 ops = &dummy_pcm_ops;
711 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
712 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
713 pcm->private_data = dummy;
714 pcm->info_flags = 0;
715 strcpy(pcm->name, "Dummy PCM");
716 if (!fake_buffer) {
717 snd_pcm_lib_preallocate_pages_for_all(pcm,
718 SNDRV_DMA_TYPE_CONTINUOUS,
719 snd_dma_continuous_data(GFP_KERNEL),
720 0, 64*1024);
721 }
722 return 0;
723}
724
725/*
726 * mixer interface
727 */
728
729#define DUMMY_VOLUME(xname, xindex, addr) \
730{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
731 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
732 .name = xname, .index = xindex, \
733 .info = snd_dummy_volume_info, \
734 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
735 .private_value = addr, \
736 .tlv = { .p = db_scale_dummy } }
737
738static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
739 struct snd_ctl_elem_info *uinfo)
740{
741 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
742 uinfo->count = 2;
743 uinfo->value.integer.min = -50;
744 uinfo->value.integer.max = 100;
745 return 0;
746}
747
748static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
749 struct snd_ctl_elem_value *ucontrol)
750{
751 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
752 int addr = kcontrol->private_value;
753
754 spin_lock_irq(&dummy->mixer_lock);
755 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
756 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
757 spin_unlock_irq(&dummy->mixer_lock);
758 return 0;
759}
760
761static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
762 struct snd_ctl_elem_value *ucontrol)
763{
764 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
765 int change, addr = kcontrol->private_value;
766 int left, right;
767
768 left = ucontrol->value.integer.value[0];
769 if (left < -50)
770 left = -50;
771 if (left > 100)
772 left = 100;
773 right = ucontrol->value.integer.value[1];
774 if (right < -50)
775 right = -50;
776 if (right > 100)
777 right = 100;
778 spin_lock_irq(&dummy->mixer_lock);
779 change = dummy->mixer_volume[addr][0] != left ||
780 dummy->mixer_volume[addr][1] != right;
781 dummy->mixer_volume[addr][0] = left;
782 dummy->mixer_volume[addr][1] = right;
783 spin_unlock_irq(&dummy->mixer_lock);
784 return change;
785}
786
787static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
788
789#define DUMMY_CAPSRC(xname, xindex, addr) \
790{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
791 .info = snd_dummy_capsrc_info, \
792 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
793 .private_value = addr }
794
795#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
796
797static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
798 struct snd_ctl_elem_value *ucontrol)
799{
800 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
801 int addr = kcontrol->private_value;
802
803 spin_lock_irq(&dummy->mixer_lock);
804 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
805 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
806 spin_unlock_irq(&dummy->mixer_lock);
807 return 0;
808}
809
810static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
811{
812 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
813 int change, addr = kcontrol->private_value;
814 int left, right;
815
816 left = ucontrol->value.integer.value[0] & 1;
817 right = ucontrol->value.integer.value[1] & 1;
818 spin_lock_irq(&dummy->mixer_lock);
819 change = dummy->capture_source[addr][0] != left &&
820 dummy->capture_source[addr][1] != right;
821 dummy->capture_source[addr][0] = left;
822 dummy->capture_source[addr][1] = right;
823 spin_unlock_irq(&dummy->mixer_lock);
824 return change;
825}
826
827static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
828 struct snd_ctl_elem_info *info)
829{
830 static const char *const names[] = { "None", "CD Player" };
831
832 return snd_ctl_enum_info(info, 1, 2, names);
833}
834
835static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
836 struct snd_ctl_elem_value *value)
837{
838 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
839
840 value->value.enumerated.item[0] = dummy->iobox;
841 return 0;
842}
843
844static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
845 struct snd_ctl_elem_value *value)
846{
847 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
848 int changed;
849
850 if (value->value.enumerated.item[0] > 1)
851 return -EINVAL;
852
853 changed = value->value.enumerated.item[0] != dummy->iobox;
854 if (changed) {
855 dummy->iobox = value->value.enumerated.item[0];
856
857 if (dummy->iobox) {
858 dummy->cd_volume_ctl->vd[0].access &=
859 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
860 dummy->cd_switch_ctl->vd[0].access &=
861 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
862 } else {
863 dummy->cd_volume_ctl->vd[0].access |=
864 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
865 dummy->cd_switch_ctl->vd[0].access |=
866 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
867 }
868
869 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
870 &dummy->cd_volume_ctl->id);
871 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
872 &dummy->cd_switch_ctl->id);
873 }
874
875 return changed;
876}
877
878static struct snd_kcontrol_new snd_dummy_controls[] = {
879DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
880DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
881DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
882DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
883DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
884DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
885DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
886DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
887DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
888DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
889{
890 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
891 .name = "External I/O Box",
892 .info = snd_dummy_iobox_info,
893 .get = snd_dummy_iobox_get,
894 .put = snd_dummy_iobox_put,
895},
896};
897
898static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
899{
900 struct snd_card *card = dummy->card;
901 struct snd_kcontrol *kcontrol;
902 unsigned int idx;
903 int err;
904
905 spin_lock_init(&dummy->mixer_lock);
906 strcpy(card->mixername, "Dummy Mixer");
907 dummy->iobox = 1;
908
909 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
910 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
911 err = snd_ctl_add(card, kcontrol);
912 if (err < 0)
913 return err;
914 if (!strcmp(kcontrol->id.name, "CD Volume"))
915 dummy->cd_volume_ctl = kcontrol;
916 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
917 dummy->cd_switch_ctl = kcontrol;
918
919 }
920 return 0;
921}
922
923#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
924/*
925 * proc interface
926 */
927static void print_formats(struct snd_dummy *dummy,
928 struct snd_info_buffer *buffer)
929{
930 int i;
931
932 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
933 if (dummy->pcm_hw.formats & (1ULL << i))
934 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
935 }
936}
937
938static void print_rates(struct snd_dummy *dummy,
939 struct snd_info_buffer *buffer)
940{
941 static int rates[] = {
942 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
943 64000, 88200, 96000, 176400, 192000,
944 };
945 int i;
946
947 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
948 snd_iprintf(buffer, " continuous");
949 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
950 snd_iprintf(buffer, " knot");
951 for (i = 0; i < ARRAY_SIZE(rates); i++)
952 if (dummy->pcm_hw.rates & (1 << i))
953 snd_iprintf(buffer, " %d", rates[i]);
954}
955
956#define get_dummy_int_ptr(dummy, ofs) \
957 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
958#define get_dummy_ll_ptr(dummy, ofs) \
959 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
960
961struct dummy_hw_field {
962 const char *name;
963 const char *format;
964 unsigned int offset;
965 unsigned int size;
966};
967#define FIELD_ENTRY(item, fmt) { \
968 .name = #item, \
969 .format = fmt, \
970 .offset = offsetof(struct snd_pcm_hardware, item), \
971 .size = sizeof(dummy_pcm_hardware.item) }
972
973static struct dummy_hw_field fields[] = {
974 FIELD_ENTRY(formats, "%#llx"),
975 FIELD_ENTRY(rates, "%#x"),
976 FIELD_ENTRY(rate_min, "%d"),
977 FIELD_ENTRY(rate_max, "%d"),
978 FIELD_ENTRY(channels_min, "%d"),
979 FIELD_ENTRY(channels_max, "%d"),
980 FIELD_ENTRY(buffer_bytes_max, "%ld"),
981 FIELD_ENTRY(period_bytes_min, "%ld"),
982 FIELD_ENTRY(period_bytes_max, "%ld"),
983 FIELD_ENTRY(periods_min, "%d"),
984 FIELD_ENTRY(periods_max, "%d"),
985};
986
987static void dummy_proc_read(struct snd_info_entry *entry,
988 struct snd_info_buffer *buffer)
989{
990 struct snd_dummy *dummy = entry->private_data;
991 int i;
992
993 for (i = 0; i < ARRAY_SIZE(fields); i++) {
994 snd_iprintf(buffer, "%s ", fields[i].name);
995 if (fields[i].size == sizeof(int))
996 snd_iprintf(buffer, fields[i].format,
997 *get_dummy_int_ptr(dummy, fields[i].offset));
998 else
999 snd_iprintf(buffer, fields[i].format,
1000 *get_dummy_ll_ptr(dummy, fields[i].offset));
1001 if (!strcmp(fields[i].name, "formats"))
1002 print_formats(dummy, buffer);
1003 else if (!strcmp(fields[i].name, "rates"))
1004 print_rates(dummy, buffer);
1005 snd_iprintf(buffer, "\n");
1006 }
1007}
1008
1009static void dummy_proc_write(struct snd_info_entry *entry,
1010 struct snd_info_buffer *buffer)
1011{
1012 struct snd_dummy *dummy = entry->private_data;
1013 char line[64];
1014
1015 while (!snd_info_get_line(buffer, line, sizeof(line))) {
1016 char item[20];
1017 const char *ptr;
1018 unsigned long long val;
1019 int i;
1020
1021 ptr = snd_info_get_str(item, line, sizeof(item));
1022 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1023 if (!strcmp(item, fields[i].name))
1024 break;
1025 }
1026 if (i >= ARRAY_SIZE(fields))
1027 continue;
1028 snd_info_get_str(item, ptr, sizeof(item));
1029 if (kstrtoull(item, 0, &val))
1030 continue;
1031 if (fields[i].size == sizeof(int))
1032 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1033 else
1034 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1035 }
1036}
1037
1038static void dummy_proc_init(struct snd_dummy *chip)
1039{
1040 struct snd_info_entry *entry;
1041
1042 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1043 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1044 entry->c.text.write = dummy_proc_write;
1045 entry->mode |= S_IWUSR;
1046 entry->private_data = chip;
1047 }
1048}
1049#else
1050#define dummy_proc_init(x)
1051#endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1052
1053static int snd_dummy_probe(struct platform_device *devptr)
1054{
1055 struct snd_card *card;
1056 struct snd_dummy *dummy;
1057 struct dummy_model *m = NULL, **mdl;
1058 int idx, err;
1059 int dev = devptr->id;
1060
1061 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1062 sizeof(struct snd_dummy), &card);
1063 if (err < 0)
1064 return err;
1065 dummy = card->private_data;
1066 dummy->card = card;
1067 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1068 if (strcmp(model[dev], (*mdl)->name) == 0) {
1069 printk(KERN_INFO
1070 "snd-dummy: Using model '%s' for card %i\n",
1071 (*mdl)->name, card->number);
1072 m = dummy->model = *mdl;
1073 break;
1074 }
1075 }
1076 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1077 if (pcm_substreams[dev] < 1)
1078 pcm_substreams[dev] = 1;
1079 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1080 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1081 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1082 if (err < 0)
1083 goto __nodev;
1084 }
1085
1086 dummy->pcm_hw = dummy_pcm_hardware;
1087 if (m) {
1088 if (m->formats)
1089 dummy->pcm_hw.formats = m->formats;
1090 if (m->buffer_bytes_max)
1091 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1092 if (m->period_bytes_min)
1093 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1094 if (m->period_bytes_max)
1095 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1096 if (m->periods_min)
1097 dummy->pcm_hw.periods_min = m->periods_min;
1098 if (m->periods_max)
1099 dummy->pcm_hw.periods_max = m->periods_max;
1100 if (m->rates)
1101 dummy->pcm_hw.rates = m->rates;
1102 if (m->rate_min)
1103 dummy->pcm_hw.rate_min = m->rate_min;
1104 if (m->rate_max)
1105 dummy->pcm_hw.rate_max = m->rate_max;
1106 if (m->channels_min)
1107 dummy->pcm_hw.channels_min = m->channels_min;
1108 if (m->channels_max)
1109 dummy->pcm_hw.channels_max = m->channels_max;
1110 }
1111
1112 err = snd_card_dummy_new_mixer(dummy);
1113 if (err < 0)
1114 goto __nodev;
1115 strcpy(card->driver, "Dummy");
1116 strcpy(card->shortname, "Dummy");
1117 sprintf(card->longname, "Dummy %i", dev + 1);
1118
1119 dummy_proc_init(dummy);
1120
1121 err = snd_card_register(card);
1122 if (err == 0) {
1123 platform_set_drvdata(devptr, card);
1124 return 0;
1125 }
1126 __nodev:
1127 snd_card_free(card);
1128 return err;
1129}
1130
1131static int snd_dummy_remove(struct platform_device *devptr)
1132{
1133 snd_card_free(platform_get_drvdata(devptr));
1134 return 0;
1135}
1136
1137#ifdef CONFIG_PM_SLEEP
1138static int snd_dummy_suspend(struct device *pdev)
1139{
1140 struct snd_card *card = dev_get_drvdata(pdev);
1141 struct snd_dummy *dummy = card->private_data;
1142
1143 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1144 snd_pcm_suspend_all(dummy->pcm);
1145 return 0;
1146}
1147
1148static int snd_dummy_resume(struct device *pdev)
1149{
1150 struct snd_card *card = dev_get_drvdata(pdev);
1151
1152 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1153 return 0;
1154}
1155
1156static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1157#define SND_DUMMY_PM_OPS &snd_dummy_pm
1158#else
1159#define SND_DUMMY_PM_OPS NULL
1160#endif
1161
1162#define SND_DUMMY_DRIVER "snd_dummy"
1163
1164static struct platform_driver snd_dummy_driver = {
1165 .probe = snd_dummy_probe,
1166 .remove = snd_dummy_remove,
1167 .driver = {
1168 .name = SND_DUMMY_DRIVER,
1169 .pm = SND_DUMMY_PM_OPS,
1170 },
1171};
1172
1173static void snd_dummy_unregister_all(void)
1174{
1175 int i;
1176
1177 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1178 platform_device_unregister(devices[i]);
1179 platform_driver_unregister(&snd_dummy_driver);
1180 free_fake_buffer();
1181}
1182
1183static int __init alsa_card_dummy_init(void)
1184{
1185 int i, cards, err;
1186
1187 err = platform_driver_register(&snd_dummy_driver);
1188 if (err < 0)
1189 return err;
1190
1191 err = alloc_fake_buffer();
1192 if (err < 0) {
1193 platform_driver_unregister(&snd_dummy_driver);
1194 return err;
1195 }
1196
1197 cards = 0;
1198 for (i = 0; i < SNDRV_CARDS; i++) {
1199 struct platform_device *device;
1200 if (! enable[i])
1201 continue;
1202 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1203 i, NULL, 0);
1204 if (IS_ERR(device))
1205 continue;
1206 if (!platform_get_drvdata(device)) {
1207 platform_device_unregister(device);
1208 continue;
1209 }
1210 devices[i] = device;
1211 cards++;
1212 }
1213 if (!cards) {
1214#ifdef MODULE
1215 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1216#endif
1217 snd_dummy_unregister_all();
1218 return -ENODEV;
1219 }
1220 return 0;
1221}
1222
1223static void __exit alsa_card_dummy_exit(void)
1224{
1225 snd_dummy_unregister_all();
1226}
1227
1228module_init(alsa_card_dummy_init)
1229module_exit(alsa_card_dummy_exit)