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