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