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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(unsigned long data)
310{
311 struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
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 setup_timer(&dpcm->timer, dummy_systimer_callback,
347 (unsigned long) dpcm);
348 spin_lock_init(&dpcm->lock);
349 dpcm->substream = substream;
350 return 0;
351}
352
353static void dummy_systimer_free(struct snd_pcm_substream *substream)
354{
355 kfree(substream->runtime->private_data);
356}
357
358static const struct dummy_timer_ops dummy_systimer_ops = {
359 .create = dummy_systimer_create,
360 .free = dummy_systimer_free,
361 .prepare = dummy_systimer_prepare,
362 .start = dummy_systimer_start,
363 .stop = dummy_systimer_stop,
364 .pointer = dummy_systimer_pointer,
365};
366
367#ifdef CONFIG_HIGH_RES_TIMERS
368/*
369 * hrtimer interface
370 */
371
372struct dummy_hrtimer_pcm {
373 /* ops must be the first item */
374 const struct dummy_timer_ops *timer_ops;
375 ktime_t base_time;
376 ktime_t period_time;
377 atomic_t running;
378 struct hrtimer timer;
379 struct tasklet_struct tasklet;
380 struct snd_pcm_substream *substream;
381};
382
383static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
384{
385 struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
386 if (atomic_read(&dpcm->running))
387 snd_pcm_period_elapsed(dpcm->substream);
388}
389
390static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
391{
392 struct dummy_hrtimer_pcm *dpcm;
393
394 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
395 if (!atomic_read(&dpcm->running))
396 return HRTIMER_NORESTART;
397 tasklet_schedule(&dpcm->tasklet);
398 hrtimer_forward_now(timer, dpcm->period_time);
399 return HRTIMER_RESTART;
400}
401
402static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
403{
404 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
405
406 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
407 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
408 atomic_set(&dpcm->running, 1);
409 return 0;
410}
411
412static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
413{
414 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
415
416 atomic_set(&dpcm->running, 0);
417 hrtimer_cancel(&dpcm->timer);
418 return 0;
419}
420
421static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
422{
423 hrtimer_cancel(&dpcm->timer);
424 tasklet_kill(&dpcm->tasklet);
425}
426
427static snd_pcm_uframes_t
428dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
429{
430 struct snd_pcm_runtime *runtime = substream->runtime;
431 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
432 u64 delta;
433 u32 pos;
434
435 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
436 dpcm->base_time);
437 delta = div_u64(delta * runtime->rate + 999999, 1000000);
438 div_u64_rem(delta, runtime->buffer_size, &pos);
439 return pos;
440}
441
442static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
443{
444 struct snd_pcm_runtime *runtime = substream->runtime;
445 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
446 unsigned int period, rate;
447 long sec;
448 unsigned long nsecs;
449
450 dummy_hrtimer_sync(dpcm);
451 period = runtime->period_size;
452 rate = runtime->rate;
453 sec = period / rate;
454 period %= rate;
455 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
456 dpcm->period_time = ktime_set(sec, nsecs);
457
458 return 0;
459}
460
461static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
462{
463 struct dummy_hrtimer_pcm *dpcm;
464
465 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
466 if (!dpcm)
467 return -ENOMEM;
468 substream->runtime->private_data = dpcm;
469 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
470 dpcm->timer.function = dummy_hrtimer_callback;
471 dpcm->substream = substream;
472 atomic_set(&dpcm->running, 0);
473 tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
474 (unsigned long)dpcm);
475 return 0;
476}
477
478static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
479{
480 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
481 dummy_hrtimer_sync(dpcm);
482 kfree(dpcm);
483}
484
485static const struct dummy_timer_ops dummy_hrtimer_ops = {
486 .create = dummy_hrtimer_create,
487 .free = dummy_hrtimer_free,
488 .prepare = dummy_hrtimer_prepare,
489 .start = dummy_hrtimer_start,
490 .stop = dummy_hrtimer_stop,
491 .pointer = dummy_hrtimer_pointer,
492};
493
494#endif /* CONFIG_HIGH_RES_TIMERS */
495
496/*
497 * PCM interface
498 */
499
500static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
501{
502 switch (cmd) {
503 case SNDRV_PCM_TRIGGER_START:
504 case SNDRV_PCM_TRIGGER_RESUME:
505 return get_dummy_ops(substream)->start(substream);
506 case SNDRV_PCM_TRIGGER_STOP:
507 case SNDRV_PCM_TRIGGER_SUSPEND:
508 return get_dummy_ops(substream)->stop(substream);
509 }
510 return -EINVAL;
511}
512
513static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
514{
515 return get_dummy_ops(substream)->prepare(substream);
516}
517
518static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
519{
520 return get_dummy_ops(substream)->pointer(substream);
521}
522
523static struct snd_pcm_hardware dummy_pcm_hardware = {
524 .info = (SNDRV_PCM_INFO_MMAP |
525 SNDRV_PCM_INFO_INTERLEAVED |
526 SNDRV_PCM_INFO_RESUME |
527 SNDRV_PCM_INFO_MMAP_VALID),
528 .formats = USE_FORMATS,
529 .rates = USE_RATE,
530 .rate_min = USE_RATE_MIN,
531 .rate_max = USE_RATE_MAX,
532 .channels_min = USE_CHANNELS_MIN,
533 .channels_max = USE_CHANNELS_MAX,
534 .buffer_bytes_max = MAX_BUFFER_SIZE,
535 .period_bytes_min = MIN_PERIOD_SIZE,
536 .period_bytes_max = MAX_PERIOD_SIZE,
537 .periods_min = USE_PERIODS_MIN,
538 .periods_max = USE_PERIODS_MAX,
539 .fifo_size = 0,
540};
541
542static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
543 struct snd_pcm_hw_params *hw_params)
544{
545 if (fake_buffer) {
546 /* runtime->dma_bytes has to be set manually to allow mmap */
547 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
548 return 0;
549 }
550 return snd_pcm_lib_malloc_pages(substream,
551 params_buffer_bytes(hw_params));
552}
553
554static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
555{
556 if (fake_buffer)
557 return 0;
558 return snd_pcm_lib_free_pages(substream);
559}
560
561static int dummy_pcm_open(struct snd_pcm_substream *substream)
562{
563 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
564 struct dummy_model *model = dummy->model;
565 struct snd_pcm_runtime *runtime = substream->runtime;
566 const struct dummy_timer_ops *ops;
567 int err;
568
569 ops = &dummy_systimer_ops;
570#ifdef CONFIG_HIGH_RES_TIMERS
571 if (hrtimer)
572 ops = &dummy_hrtimer_ops;
573#endif
574
575 err = ops->create(substream);
576 if (err < 0)
577 return err;
578 get_dummy_ops(substream) = ops;
579
580 runtime->hw = dummy->pcm_hw;
581 if (substream->pcm->device & 1) {
582 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
583 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
584 }
585 if (substream->pcm->device & 2)
586 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
587 SNDRV_PCM_INFO_MMAP_VALID);
588
589 if (model == NULL)
590 return 0;
591
592 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
593 if (model->playback_constraints)
594 err = model->playback_constraints(substream->runtime);
595 } else {
596 if (model->capture_constraints)
597 err = model->capture_constraints(substream->runtime);
598 }
599 if (err < 0) {
600 get_dummy_ops(substream)->free(substream);
601 return err;
602 }
603 return 0;
604}
605
606static int dummy_pcm_close(struct snd_pcm_substream *substream)
607{
608 get_dummy_ops(substream)->free(substream);
609 return 0;
610}
611
612/*
613 * dummy buffer handling
614 */
615
616static void *dummy_page[2];
617
618static void free_fake_buffer(void)
619{
620 if (fake_buffer) {
621 int i;
622 for (i = 0; i < 2; i++)
623 if (dummy_page[i]) {
624 free_page((unsigned long)dummy_page[i]);
625 dummy_page[i] = NULL;
626 }
627 }
628}
629
630static int alloc_fake_buffer(void)
631{
632 int i;
633
634 if (!fake_buffer)
635 return 0;
636 for (i = 0; i < 2; i++) {
637 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
638 if (!dummy_page[i]) {
639 free_fake_buffer();
640 return -ENOMEM;
641 }
642 }
643 return 0;
644}
645
646static int dummy_pcm_copy(struct snd_pcm_substream *substream,
647 int channel, snd_pcm_uframes_t pos,
648 void __user *dst, snd_pcm_uframes_t count)
649{
650 return 0; /* do nothing */
651}
652
653static int dummy_pcm_silence(struct snd_pcm_substream *substream,
654 int channel, snd_pcm_uframes_t pos,
655 snd_pcm_uframes_t count)
656{
657 return 0; /* do nothing */
658}
659
660static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
661 unsigned long offset)
662{
663 return virt_to_page(dummy_page[substream->stream]); /* the same page */
664}
665
666static struct snd_pcm_ops dummy_pcm_ops = {
667 .open = dummy_pcm_open,
668 .close = dummy_pcm_close,
669 .ioctl = snd_pcm_lib_ioctl,
670 .hw_params = dummy_pcm_hw_params,
671 .hw_free = dummy_pcm_hw_free,
672 .prepare = dummy_pcm_prepare,
673 .trigger = dummy_pcm_trigger,
674 .pointer = dummy_pcm_pointer,
675};
676
677static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
678 .open = dummy_pcm_open,
679 .close = dummy_pcm_close,
680 .ioctl = snd_pcm_lib_ioctl,
681 .hw_params = dummy_pcm_hw_params,
682 .hw_free = dummy_pcm_hw_free,
683 .prepare = dummy_pcm_prepare,
684 .trigger = dummy_pcm_trigger,
685 .pointer = dummy_pcm_pointer,
686 .copy = dummy_pcm_copy,
687 .silence = dummy_pcm_silence,
688 .page = dummy_pcm_page,
689};
690
691static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
692 int substreams)
693{
694 struct snd_pcm *pcm;
695 struct snd_pcm_ops *ops;
696 int err;
697
698 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
699 substreams, substreams, &pcm);
700 if (err < 0)
701 return err;
702 dummy->pcm = pcm;
703 if (fake_buffer)
704 ops = &dummy_pcm_ops_no_buf;
705 else
706 ops = &dummy_pcm_ops;
707 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
708 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
709 pcm->private_data = dummy;
710 pcm->info_flags = 0;
711 strcpy(pcm->name, "Dummy PCM");
712 if (!fake_buffer) {
713 snd_pcm_lib_preallocate_pages_for_all(pcm,
714 SNDRV_DMA_TYPE_CONTINUOUS,
715 snd_dma_continuous_data(GFP_KERNEL),
716 0, 64*1024);
717 }
718 return 0;
719}
720
721/*
722 * mixer interface
723 */
724
725#define DUMMY_VOLUME(xname, xindex, addr) \
726{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
727 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
728 .name = xname, .index = xindex, \
729 .info = snd_dummy_volume_info, \
730 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
731 .private_value = addr, \
732 .tlv = { .p = db_scale_dummy } }
733
734static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
735 struct snd_ctl_elem_info *uinfo)
736{
737 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
738 uinfo->count = 2;
739 uinfo->value.integer.min = -50;
740 uinfo->value.integer.max = 100;
741 return 0;
742}
743
744static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
745 struct snd_ctl_elem_value *ucontrol)
746{
747 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
748 int addr = kcontrol->private_value;
749
750 spin_lock_irq(&dummy->mixer_lock);
751 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
752 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
753 spin_unlock_irq(&dummy->mixer_lock);
754 return 0;
755}
756
757static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
758 struct snd_ctl_elem_value *ucontrol)
759{
760 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
761 int change, addr = kcontrol->private_value;
762 int left, right;
763
764 left = ucontrol->value.integer.value[0];
765 if (left < -50)
766 left = -50;
767 if (left > 100)
768 left = 100;
769 right = ucontrol->value.integer.value[1];
770 if (right < -50)
771 right = -50;
772 if (right > 100)
773 right = 100;
774 spin_lock_irq(&dummy->mixer_lock);
775 change = dummy->mixer_volume[addr][0] != left ||
776 dummy->mixer_volume[addr][1] != right;
777 dummy->mixer_volume[addr][0] = left;
778 dummy->mixer_volume[addr][1] = right;
779 spin_unlock_irq(&dummy->mixer_lock);
780 return change;
781}
782
783static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
784
785#define DUMMY_CAPSRC(xname, xindex, addr) \
786{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
787 .info = snd_dummy_capsrc_info, \
788 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
789 .private_value = addr }
790
791#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
792
793static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
794 struct snd_ctl_elem_value *ucontrol)
795{
796 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
797 int addr = kcontrol->private_value;
798
799 spin_lock_irq(&dummy->mixer_lock);
800 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
801 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
802 spin_unlock_irq(&dummy->mixer_lock);
803 return 0;
804}
805
806static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
807{
808 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
809 int change, addr = kcontrol->private_value;
810 int left, right;
811
812 left = ucontrol->value.integer.value[0] & 1;
813 right = ucontrol->value.integer.value[1] & 1;
814 spin_lock_irq(&dummy->mixer_lock);
815 change = dummy->capture_source[addr][0] != left &&
816 dummy->capture_source[addr][1] != right;
817 dummy->capture_source[addr][0] = left;
818 dummy->capture_source[addr][1] = right;
819 spin_unlock_irq(&dummy->mixer_lock);
820 return change;
821}
822
823static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
824 struct snd_ctl_elem_info *info)
825{
826 const char *const names[] = { "None", "CD Player" };
827
828 return snd_ctl_enum_info(info, 1, 2, names);
829}
830
831static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
832 struct snd_ctl_elem_value *value)
833{
834 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
835
836 value->value.enumerated.item[0] = dummy->iobox;
837 return 0;
838}
839
840static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
841 struct snd_ctl_elem_value *value)
842{
843 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
844 int changed;
845
846 if (value->value.enumerated.item[0] > 1)
847 return -EINVAL;
848
849 changed = value->value.enumerated.item[0] != dummy->iobox;
850 if (changed) {
851 dummy->iobox = value->value.enumerated.item[0];
852
853 if (dummy->iobox) {
854 dummy->cd_volume_ctl->vd[0].access &=
855 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
856 dummy->cd_switch_ctl->vd[0].access &=
857 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
858 } else {
859 dummy->cd_volume_ctl->vd[0].access |=
860 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
861 dummy->cd_switch_ctl->vd[0].access |=
862 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
863 }
864
865 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
866 &dummy->cd_volume_ctl->id);
867 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
868 &dummy->cd_switch_ctl->id);
869 }
870
871 return changed;
872}
873
874static struct snd_kcontrol_new snd_dummy_controls[] = {
875DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
876DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
877DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
878DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
879DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
880DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
881DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
882DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
883DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
884DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
885{
886 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
887 .name = "External I/O Box",
888 .info = snd_dummy_iobox_info,
889 .get = snd_dummy_iobox_get,
890 .put = snd_dummy_iobox_put,
891},
892};
893
894static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
895{
896 struct snd_card *card = dummy->card;
897 struct snd_kcontrol *kcontrol;
898 unsigned int idx;
899 int err;
900
901 spin_lock_init(&dummy->mixer_lock);
902 strcpy(card->mixername, "Dummy Mixer");
903 dummy->iobox = 1;
904
905 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
906 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
907 err = snd_ctl_add(card, kcontrol);
908 if (err < 0)
909 return err;
910 if (!strcmp(kcontrol->id.name, "CD Volume"))
911 dummy->cd_volume_ctl = kcontrol;
912 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
913 dummy->cd_switch_ctl = kcontrol;
914
915 }
916 return 0;
917}
918
919#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
920/*
921 * proc interface
922 */
923static void print_formats(struct snd_dummy *dummy,
924 struct snd_info_buffer *buffer)
925{
926 int i;
927
928 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
929 if (dummy->pcm_hw.formats & (1ULL << i))
930 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
931 }
932}
933
934static void print_rates(struct snd_dummy *dummy,
935 struct snd_info_buffer *buffer)
936{
937 static int rates[] = {
938 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
939 64000, 88200, 96000, 176400, 192000,
940 };
941 int i;
942
943 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
944 snd_iprintf(buffer, " continuous");
945 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
946 snd_iprintf(buffer, " knot");
947 for (i = 0; i < ARRAY_SIZE(rates); i++)
948 if (dummy->pcm_hw.rates & (1 << i))
949 snd_iprintf(buffer, " %d", rates[i]);
950}
951
952#define get_dummy_int_ptr(dummy, ofs) \
953 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
954#define get_dummy_ll_ptr(dummy, ofs) \
955 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
956
957struct dummy_hw_field {
958 const char *name;
959 const char *format;
960 unsigned int offset;
961 unsigned int size;
962};
963#define FIELD_ENTRY(item, fmt) { \
964 .name = #item, \
965 .format = fmt, \
966 .offset = offsetof(struct snd_pcm_hardware, item), \
967 .size = sizeof(dummy_pcm_hardware.item) }
968
969static struct dummy_hw_field fields[] = {
970 FIELD_ENTRY(formats, "%#llx"),
971 FIELD_ENTRY(rates, "%#x"),
972 FIELD_ENTRY(rate_min, "%d"),
973 FIELD_ENTRY(rate_max, "%d"),
974 FIELD_ENTRY(channels_min, "%d"),
975 FIELD_ENTRY(channels_max, "%d"),
976 FIELD_ENTRY(buffer_bytes_max, "%ld"),
977 FIELD_ENTRY(period_bytes_min, "%ld"),
978 FIELD_ENTRY(period_bytes_max, "%ld"),
979 FIELD_ENTRY(periods_min, "%d"),
980 FIELD_ENTRY(periods_max, "%d"),
981};
982
983static void dummy_proc_read(struct snd_info_entry *entry,
984 struct snd_info_buffer *buffer)
985{
986 struct snd_dummy *dummy = entry->private_data;
987 int i;
988
989 for (i = 0; i < ARRAY_SIZE(fields); i++) {
990 snd_iprintf(buffer, "%s ", fields[i].name);
991 if (fields[i].size == sizeof(int))
992 snd_iprintf(buffer, fields[i].format,
993 *get_dummy_int_ptr(dummy, fields[i].offset));
994 else
995 snd_iprintf(buffer, fields[i].format,
996 *get_dummy_ll_ptr(dummy, fields[i].offset));
997 if (!strcmp(fields[i].name, "formats"))
998 print_formats(dummy, buffer);
999 else if (!strcmp(fields[i].name, "rates"))
1000 print_rates(dummy, buffer);
1001 snd_iprintf(buffer, "\n");
1002 }
1003}
1004
1005static void dummy_proc_write(struct snd_info_entry *entry,
1006 struct snd_info_buffer *buffer)
1007{
1008 struct snd_dummy *dummy = entry->private_data;
1009 char line[64];
1010
1011 while (!snd_info_get_line(buffer, line, sizeof(line))) {
1012 char item[20];
1013 const char *ptr;
1014 unsigned long long val;
1015 int i;
1016
1017 ptr = snd_info_get_str(item, line, sizeof(item));
1018 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1019 if (!strcmp(item, fields[i].name))
1020 break;
1021 }
1022 if (i >= ARRAY_SIZE(fields))
1023 continue;
1024 snd_info_get_str(item, ptr, sizeof(item));
1025 if (kstrtoull(item, 0, &val))
1026 continue;
1027 if (fields[i].size == sizeof(int))
1028 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1029 else
1030 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1031 }
1032}
1033
1034static void dummy_proc_init(struct snd_dummy *chip)
1035{
1036 struct snd_info_entry *entry;
1037
1038 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1039 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1040 entry->c.text.write = dummy_proc_write;
1041 entry->mode |= S_IWUSR;
1042 entry->private_data = chip;
1043 }
1044}
1045#else
1046#define dummy_proc_init(x)
1047#endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1048
1049static int snd_dummy_probe(struct platform_device *devptr)
1050{
1051 struct snd_card *card;
1052 struct snd_dummy *dummy;
1053 struct dummy_model *m = NULL, **mdl;
1054 int idx, err;
1055 int dev = devptr->id;
1056
1057 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1058 sizeof(struct snd_dummy), &card);
1059 if (err < 0)
1060 return err;
1061 dummy = card->private_data;
1062 dummy->card = card;
1063 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1064 if (strcmp(model[dev], (*mdl)->name) == 0) {
1065 printk(KERN_INFO
1066 "snd-dummy: Using model '%s' for card %i\n",
1067 (*mdl)->name, card->number);
1068 m = dummy->model = *mdl;
1069 break;
1070 }
1071 }
1072 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1073 if (pcm_substreams[dev] < 1)
1074 pcm_substreams[dev] = 1;
1075 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1076 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1077 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1078 if (err < 0)
1079 goto __nodev;
1080 }
1081
1082 dummy->pcm_hw = dummy_pcm_hardware;
1083 if (m) {
1084 if (m->formats)
1085 dummy->pcm_hw.formats = m->formats;
1086 if (m->buffer_bytes_max)
1087 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1088 if (m->period_bytes_min)
1089 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1090 if (m->period_bytes_max)
1091 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1092 if (m->periods_min)
1093 dummy->pcm_hw.periods_min = m->periods_min;
1094 if (m->periods_max)
1095 dummy->pcm_hw.periods_max = m->periods_max;
1096 if (m->rates)
1097 dummy->pcm_hw.rates = m->rates;
1098 if (m->rate_min)
1099 dummy->pcm_hw.rate_min = m->rate_min;
1100 if (m->rate_max)
1101 dummy->pcm_hw.rate_max = m->rate_max;
1102 if (m->channels_min)
1103 dummy->pcm_hw.channels_min = m->channels_min;
1104 if (m->channels_max)
1105 dummy->pcm_hw.channels_max = m->channels_max;
1106 }
1107
1108 err = snd_card_dummy_new_mixer(dummy);
1109 if (err < 0)
1110 goto __nodev;
1111 strcpy(card->driver, "Dummy");
1112 strcpy(card->shortname, "Dummy");
1113 sprintf(card->longname, "Dummy %i", dev + 1);
1114
1115 dummy_proc_init(dummy);
1116
1117 err = snd_card_register(card);
1118 if (err == 0) {
1119 platform_set_drvdata(devptr, card);
1120 return 0;
1121 }
1122 __nodev:
1123 snd_card_free(card);
1124 return err;
1125}
1126
1127static int snd_dummy_remove(struct platform_device *devptr)
1128{
1129 snd_card_free(platform_get_drvdata(devptr));
1130 return 0;
1131}
1132
1133#ifdef CONFIG_PM_SLEEP
1134static int snd_dummy_suspend(struct device *pdev)
1135{
1136 struct snd_card *card = dev_get_drvdata(pdev);
1137 struct snd_dummy *dummy = card->private_data;
1138
1139 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1140 snd_pcm_suspend_all(dummy->pcm);
1141 return 0;
1142}
1143
1144static int snd_dummy_resume(struct device *pdev)
1145{
1146 struct snd_card *card = dev_get_drvdata(pdev);
1147
1148 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1149 return 0;
1150}
1151
1152static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1153#define SND_DUMMY_PM_OPS &snd_dummy_pm
1154#else
1155#define SND_DUMMY_PM_OPS NULL
1156#endif
1157
1158#define SND_DUMMY_DRIVER "snd_dummy"
1159
1160static struct platform_driver snd_dummy_driver = {
1161 .probe = snd_dummy_probe,
1162 .remove = snd_dummy_remove,
1163 .driver = {
1164 .name = SND_DUMMY_DRIVER,
1165 .pm = SND_DUMMY_PM_OPS,
1166 },
1167};
1168
1169static void snd_dummy_unregister_all(void)
1170{
1171 int i;
1172
1173 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1174 platform_device_unregister(devices[i]);
1175 platform_driver_unregister(&snd_dummy_driver);
1176 free_fake_buffer();
1177}
1178
1179static int __init alsa_card_dummy_init(void)
1180{
1181 int i, cards, err;
1182
1183 err = platform_driver_register(&snd_dummy_driver);
1184 if (err < 0)
1185 return err;
1186
1187 err = alloc_fake_buffer();
1188 if (err < 0) {
1189 platform_driver_unregister(&snd_dummy_driver);
1190 return err;
1191 }
1192
1193 cards = 0;
1194 for (i = 0; i < SNDRV_CARDS; i++) {
1195 struct platform_device *device;
1196 if (! enable[i])
1197 continue;
1198 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1199 i, NULL, 0);
1200 if (IS_ERR(device))
1201 continue;
1202 if (!platform_get_drvdata(device)) {
1203 platform_device_unregister(device);
1204 continue;
1205 }
1206 devices[i] = device;
1207 cards++;
1208 }
1209 if (!cards) {
1210#ifdef MODULE
1211 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1212#endif
1213 snd_dummy_unregister_all();
1214 return -ENODEV;
1215 }
1216 return 0;
1217}
1218
1219static void __exit alsa_card_dummy_exit(void)
1220{
1221 snd_dummy_unregister_all();
1222}
1223
1224module_init(alsa_card_dummy_init)
1225module_exit(alsa_card_dummy_exit)
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 struct iov_iter *iter, unsigned long bytes)
630{
631 return 0; /* do nothing */
632}
633
634static 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
641static 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
647static 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
656static 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 = dummy_pcm_copy,
664 .fill_silence = dummy_pcm_silence,
665 .page = dummy_pcm_page,
666};
667
668static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
669 int substreams)
670{
671 struct snd_pcm *pcm;
672 const struct snd_pcm_ops *ops;
673 int err;
674
675 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
676 substreams, substreams, &pcm);
677 if (err < 0)
678 return err;
679 dummy->pcm = pcm;
680 if (fake_buffer)
681 ops = &dummy_pcm_ops_no_buf;
682 else
683 ops = &dummy_pcm_ops;
684 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
685 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
686 pcm->private_data = dummy;
687 pcm->info_flags = 0;
688 strcpy(pcm->name, "Dummy PCM");
689 if (!fake_buffer) {
690 snd_pcm_set_managed_buffer_all(pcm,
691 SNDRV_DMA_TYPE_CONTINUOUS,
692 NULL,
693 0, 64*1024);
694 }
695 return 0;
696}
697
698/*
699 * mixer interface
700 */
701
702#define DUMMY_VOLUME(xname, xindex, addr) \
703{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
704 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
705 .name = xname, .index = xindex, \
706 .info = snd_dummy_volume_info, \
707 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
708 .private_value = addr, \
709 .tlv = { .p = db_scale_dummy } }
710
711static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
712 struct snd_ctl_elem_info *uinfo)
713{
714 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
715 uinfo->count = 2;
716 uinfo->value.integer.min = mixer_volume_level_min;
717 uinfo->value.integer.max = mixer_volume_level_max;
718 return 0;
719}
720
721static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
722 struct snd_ctl_elem_value *ucontrol)
723{
724 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
725 int addr = kcontrol->private_value;
726
727 spin_lock_irq(&dummy->mixer_lock);
728 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
729 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
730 spin_unlock_irq(&dummy->mixer_lock);
731 return 0;
732}
733
734static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
735 struct snd_ctl_elem_value *ucontrol)
736{
737 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
738 int change, addr = kcontrol->private_value;
739 int left, right;
740
741 left = ucontrol->value.integer.value[0];
742 if (left < mixer_volume_level_min)
743 left = mixer_volume_level_min;
744 if (left > mixer_volume_level_max)
745 left = mixer_volume_level_max;
746 right = ucontrol->value.integer.value[1];
747 if (right < mixer_volume_level_min)
748 right = mixer_volume_level_min;
749 if (right > mixer_volume_level_max)
750 right = mixer_volume_level_max;
751 spin_lock_irq(&dummy->mixer_lock);
752 change = dummy->mixer_volume[addr][0] != left ||
753 dummy->mixer_volume[addr][1] != right;
754 dummy->mixer_volume[addr][0] = left;
755 dummy->mixer_volume[addr][1] = right;
756 spin_unlock_irq(&dummy->mixer_lock);
757 return change;
758}
759
760static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
761
762#define DUMMY_CAPSRC(xname, xindex, addr) \
763{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
764 .info = snd_dummy_capsrc_info, \
765 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
766 .private_value = addr }
767
768#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
769
770static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
771 struct snd_ctl_elem_value *ucontrol)
772{
773 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
774 int addr = kcontrol->private_value;
775
776 spin_lock_irq(&dummy->mixer_lock);
777 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
778 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
779 spin_unlock_irq(&dummy->mixer_lock);
780 return 0;
781}
782
783static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
784{
785 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
786 int change, addr = kcontrol->private_value;
787 int left, right;
788
789 left = ucontrol->value.integer.value[0] & 1;
790 right = ucontrol->value.integer.value[1] & 1;
791 spin_lock_irq(&dummy->mixer_lock);
792 change = dummy->capture_source[addr][0] != left &&
793 dummy->capture_source[addr][1] != right;
794 dummy->capture_source[addr][0] = left;
795 dummy->capture_source[addr][1] = right;
796 spin_unlock_irq(&dummy->mixer_lock);
797 return change;
798}
799
800static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
801 struct snd_ctl_elem_info *info)
802{
803 static const char *const names[] = { "None", "CD Player" };
804
805 return snd_ctl_enum_info(info, 1, 2, names);
806}
807
808static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
809 struct snd_ctl_elem_value *value)
810{
811 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
812
813 value->value.enumerated.item[0] = dummy->iobox;
814 return 0;
815}
816
817static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
818 struct snd_ctl_elem_value *value)
819{
820 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
821 int changed;
822
823 if (value->value.enumerated.item[0] > 1)
824 return -EINVAL;
825
826 changed = value->value.enumerated.item[0] != dummy->iobox;
827 if (changed) {
828 dummy->iobox = value->value.enumerated.item[0];
829
830 if (dummy->iobox) {
831 dummy->cd_volume_ctl->vd[0].access &=
832 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
833 dummy->cd_switch_ctl->vd[0].access &=
834 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
835 } else {
836 dummy->cd_volume_ctl->vd[0].access |=
837 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
838 dummy->cd_switch_ctl->vd[0].access |=
839 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
840 }
841
842 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
843 &dummy->cd_volume_ctl->id);
844 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
845 &dummy->cd_switch_ctl->id);
846 }
847
848 return changed;
849}
850
851static const struct snd_kcontrol_new snd_dummy_controls[] = {
852DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
853DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
854DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
855DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
856DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
857DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
858DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
859DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
860DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
861DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
862{
863 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
864 .name = "External I/O Box",
865 .info = snd_dummy_iobox_info,
866 .get = snd_dummy_iobox_get,
867 .put = snd_dummy_iobox_put,
868},
869};
870
871static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
872{
873 struct snd_card *card = dummy->card;
874 struct snd_kcontrol *kcontrol;
875 unsigned int idx;
876 int err;
877
878 spin_lock_init(&dummy->mixer_lock);
879 strcpy(card->mixername, "Dummy Mixer");
880 dummy->iobox = 1;
881
882 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
883 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
884 err = snd_ctl_add(card, kcontrol);
885 if (err < 0)
886 return err;
887 if (!strcmp(kcontrol->id.name, "CD Volume"))
888 dummy->cd_volume_ctl = kcontrol;
889 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
890 dummy->cd_switch_ctl = kcontrol;
891
892 }
893 return 0;
894}
895
896#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
897/*
898 * proc interface
899 */
900static void print_formats(struct snd_dummy *dummy,
901 struct snd_info_buffer *buffer)
902{
903 snd_pcm_format_t i;
904
905 pcm_for_each_format(i) {
906 if (dummy->pcm_hw.formats & pcm_format_to_bits(i))
907 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
908 }
909}
910
911static void print_rates(struct snd_dummy *dummy,
912 struct snd_info_buffer *buffer)
913{
914 static const int rates[] = {
915 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
916 64000, 88200, 96000, 176400, 192000,
917 };
918 int i;
919
920 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
921 snd_iprintf(buffer, " continuous");
922 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
923 snd_iprintf(buffer, " knot");
924 for (i = 0; i < ARRAY_SIZE(rates); i++)
925 if (dummy->pcm_hw.rates & (1 << i))
926 snd_iprintf(buffer, " %d", rates[i]);
927}
928
929#define get_dummy_int_ptr(dummy, ofs) \
930 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
931#define get_dummy_ll_ptr(dummy, ofs) \
932 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
933
934struct dummy_hw_field {
935 const char *name;
936 const char *format;
937 unsigned int offset;
938 unsigned int size;
939};
940#define FIELD_ENTRY(item, fmt) { \
941 .name = #item, \
942 .format = fmt, \
943 .offset = offsetof(struct snd_pcm_hardware, item), \
944 .size = sizeof(dummy_pcm_hardware.item) }
945
946static const struct dummy_hw_field fields[] = {
947 FIELD_ENTRY(formats, "%#llx"),
948 FIELD_ENTRY(rates, "%#x"),
949 FIELD_ENTRY(rate_min, "%d"),
950 FIELD_ENTRY(rate_max, "%d"),
951 FIELD_ENTRY(channels_min, "%d"),
952 FIELD_ENTRY(channels_max, "%d"),
953 FIELD_ENTRY(buffer_bytes_max, "%ld"),
954 FIELD_ENTRY(period_bytes_min, "%ld"),
955 FIELD_ENTRY(period_bytes_max, "%ld"),
956 FIELD_ENTRY(periods_min, "%d"),
957 FIELD_ENTRY(periods_max, "%d"),
958};
959
960static void dummy_proc_read(struct snd_info_entry *entry,
961 struct snd_info_buffer *buffer)
962{
963 struct snd_dummy *dummy = entry->private_data;
964 int i;
965
966 for (i = 0; i < ARRAY_SIZE(fields); i++) {
967 snd_iprintf(buffer, "%s ", fields[i].name);
968 if (fields[i].size == sizeof(int))
969 snd_iprintf(buffer, fields[i].format,
970 *get_dummy_int_ptr(dummy, fields[i].offset));
971 else
972 snd_iprintf(buffer, fields[i].format,
973 *get_dummy_ll_ptr(dummy, fields[i].offset));
974 if (!strcmp(fields[i].name, "formats"))
975 print_formats(dummy, buffer);
976 else if (!strcmp(fields[i].name, "rates"))
977 print_rates(dummy, buffer);
978 snd_iprintf(buffer, "\n");
979 }
980}
981
982static void dummy_proc_write(struct snd_info_entry *entry,
983 struct snd_info_buffer *buffer)
984{
985 struct snd_dummy *dummy = entry->private_data;
986 char line[64];
987
988 while (!snd_info_get_line(buffer, line, sizeof(line))) {
989 char item[20];
990 const char *ptr;
991 unsigned long long val;
992 int i;
993
994 ptr = snd_info_get_str(item, line, sizeof(item));
995 for (i = 0; i < ARRAY_SIZE(fields); i++) {
996 if (!strcmp(item, fields[i].name))
997 break;
998 }
999 if (i >= ARRAY_SIZE(fields))
1000 continue;
1001 snd_info_get_str(item, ptr, sizeof(item));
1002 if (kstrtoull(item, 0, &val))
1003 continue;
1004 if (fields[i].size == sizeof(int))
1005 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1006 else
1007 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1008 }
1009}
1010
1011static void dummy_proc_init(struct snd_dummy *chip)
1012{
1013 snd_card_rw_proc_new(chip->card, "dummy_pcm", chip,
1014 dummy_proc_read, dummy_proc_write);
1015}
1016#else
1017#define dummy_proc_init(x)
1018#endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1019
1020static int snd_dummy_probe(struct platform_device *devptr)
1021{
1022 struct snd_card *card;
1023 struct snd_dummy *dummy;
1024 const struct dummy_model *m = NULL, **mdl;
1025 int idx, err;
1026 int dev = devptr->id;
1027
1028 err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1029 sizeof(struct snd_dummy), &card);
1030 if (err < 0)
1031 return err;
1032 dummy = card->private_data;
1033 dummy->card = card;
1034 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1035 if (strcmp(model[dev], (*mdl)->name) == 0) {
1036 printk(KERN_INFO
1037 "snd-dummy: Using model '%s' for card %i\n",
1038 (*mdl)->name, card->number);
1039 m = dummy->model = *mdl;
1040 break;
1041 }
1042 }
1043 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1044 if (pcm_substreams[dev] < 1)
1045 pcm_substreams[dev] = 1;
1046 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1047 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1048 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1049 if (err < 0)
1050 return err;
1051 }
1052
1053 dummy->pcm_hw = dummy_pcm_hardware;
1054 if (m) {
1055 if (m->formats)
1056 dummy->pcm_hw.formats = m->formats;
1057 if (m->buffer_bytes_max)
1058 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1059 if (m->period_bytes_min)
1060 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1061 if (m->period_bytes_max)
1062 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1063 if (m->periods_min)
1064 dummy->pcm_hw.periods_min = m->periods_min;
1065 if (m->periods_max)
1066 dummy->pcm_hw.periods_max = m->periods_max;
1067 if (m->rates)
1068 dummy->pcm_hw.rates = m->rates;
1069 if (m->rate_min)
1070 dummy->pcm_hw.rate_min = m->rate_min;
1071 if (m->rate_max)
1072 dummy->pcm_hw.rate_max = m->rate_max;
1073 if (m->channels_min)
1074 dummy->pcm_hw.channels_min = m->channels_min;
1075 if (m->channels_max)
1076 dummy->pcm_hw.channels_max = m->channels_max;
1077 }
1078
1079 if (mixer_volume_level_min > mixer_volume_level_max) {
1080 pr_warn("snd-dummy: Invalid mixer volume level: min=%d, max=%d. Fall back to default value.\n",
1081 mixer_volume_level_min, mixer_volume_level_max);
1082 mixer_volume_level_min = USE_MIXER_VOLUME_LEVEL_MIN;
1083 mixer_volume_level_max = USE_MIXER_VOLUME_LEVEL_MAX;
1084 }
1085 err = snd_card_dummy_new_mixer(dummy);
1086 if (err < 0)
1087 return err;
1088 strcpy(card->driver, "Dummy");
1089 strcpy(card->shortname, "Dummy");
1090 sprintf(card->longname, "Dummy %i", dev + 1);
1091
1092 dummy_proc_init(dummy);
1093
1094 err = snd_card_register(card);
1095 if (err < 0)
1096 return err;
1097 platform_set_drvdata(devptr, card);
1098 return 0;
1099}
1100
1101#ifdef CONFIG_PM_SLEEP
1102static int snd_dummy_suspend(struct device *pdev)
1103{
1104 struct snd_card *card = dev_get_drvdata(pdev);
1105
1106 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1107 return 0;
1108}
1109
1110static int snd_dummy_resume(struct device *pdev)
1111{
1112 struct snd_card *card = dev_get_drvdata(pdev);
1113
1114 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1115 return 0;
1116}
1117
1118static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1119#define SND_DUMMY_PM_OPS &snd_dummy_pm
1120#else
1121#define SND_DUMMY_PM_OPS NULL
1122#endif
1123
1124#define SND_DUMMY_DRIVER "snd_dummy"
1125
1126static struct platform_driver snd_dummy_driver = {
1127 .probe = snd_dummy_probe,
1128 .driver = {
1129 .name = SND_DUMMY_DRIVER,
1130 .pm = SND_DUMMY_PM_OPS,
1131 },
1132};
1133
1134static void snd_dummy_unregister_all(void)
1135{
1136 int i;
1137
1138 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1139 platform_device_unregister(devices[i]);
1140 platform_driver_unregister(&snd_dummy_driver);
1141 free_fake_buffer();
1142}
1143
1144static int __init alsa_card_dummy_init(void)
1145{
1146 int i, cards, err;
1147
1148 err = platform_driver_register(&snd_dummy_driver);
1149 if (err < 0)
1150 return err;
1151
1152 err = alloc_fake_buffer();
1153 if (err < 0) {
1154 platform_driver_unregister(&snd_dummy_driver);
1155 return err;
1156 }
1157
1158 cards = 0;
1159 for (i = 0; i < SNDRV_CARDS; i++) {
1160 struct platform_device *device;
1161 if (! enable[i])
1162 continue;
1163 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1164 i, NULL, 0);
1165 if (IS_ERR(device))
1166 continue;
1167 if (!platform_get_drvdata(device)) {
1168 platform_device_unregister(device);
1169 continue;
1170 }
1171 devices[i] = device;
1172 cards++;
1173 }
1174 if (!cards) {
1175#ifdef MODULE
1176 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1177#endif
1178 snd_dummy_unregister_all();
1179 return -ENODEV;
1180 }
1181 return 0;
1182}
1183
1184static void __exit alsa_card_dummy_exit(void)
1185{
1186 snd_dummy_unregister_all();
1187}
1188
1189module_init(alsa_card_dummy_init)
1190module_exit(alsa_card_dummy_exit)