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Merge branch 'for-4.1/drivers' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / sound / drivers / dummy.c
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 struct 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
129 struct 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
147 static 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
159 struct dummy_model model_emu10k1 = {
160 .name = "emu10k1",
161 .playback_constraints = emu10k1_playback_constraints,
162 .buffer_bytes_max = 128 * 1024,
163 };
164
165 struct 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
175 struct 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
185 struct 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
195 struct 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
205 struct 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
219 struct 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
233 struct 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
246 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
247 {
248 mod_timer(&dpcm->timer, jiffies +
249 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
250 }
251
252 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
253 {
254 unsigned long delta;
255
256 delta = jiffies - dpcm->base_time;
257 if (!delta)
258 return;
259 dpcm->base_time += delta;
260 delta *= dpcm->rate;
261 dpcm->frac_pos += delta;
262 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
263 dpcm->frac_pos -= dpcm->frac_buffer_size;
264 while (dpcm->frac_period_rest <= delta) {
265 dpcm->elapsed++;
266 dpcm->frac_period_rest += dpcm->frac_period_size;
267 }
268 dpcm->frac_period_rest -= delta;
269 }
270
271 static int dummy_systimer_start(struct snd_pcm_substream *substream)
272 {
273 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
274 spin_lock(&dpcm->lock);
275 dpcm->base_time = jiffies;
276 dummy_systimer_rearm(dpcm);
277 spin_unlock(&dpcm->lock);
278 return 0;
279 }
280
281 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
282 {
283 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
284 spin_lock(&dpcm->lock);
285 del_timer(&dpcm->timer);
286 spin_unlock(&dpcm->lock);
287 return 0;
288 }
289
290 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
291 {
292 struct snd_pcm_runtime *runtime = substream->runtime;
293 struct dummy_systimer_pcm *dpcm = runtime->private_data;
294
295 dpcm->frac_pos = 0;
296 dpcm->rate = runtime->rate;
297 dpcm->frac_buffer_size = runtime->buffer_size * HZ;
298 dpcm->frac_period_size = runtime->period_size * HZ;
299 dpcm->frac_period_rest = dpcm->frac_period_size;
300 dpcm->elapsed = 0;
301
302 return 0;
303 }
304
305 static void dummy_systimer_callback(unsigned long data)
306 {
307 struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
308 unsigned long flags;
309 int elapsed = 0;
310
311 spin_lock_irqsave(&dpcm->lock, flags);
312 dummy_systimer_update(dpcm);
313 dummy_systimer_rearm(dpcm);
314 elapsed = dpcm->elapsed;
315 dpcm->elapsed = 0;
316 spin_unlock_irqrestore(&dpcm->lock, flags);
317 if (elapsed)
318 snd_pcm_period_elapsed(dpcm->substream);
319 }
320
321 static snd_pcm_uframes_t
322 dummy_systimer_pointer(struct snd_pcm_substream *substream)
323 {
324 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
325 snd_pcm_uframes_t pos;
326
327 spin_lock(&dpcm->lock);
328 dummy_systimer_update(dpcm);
329 pos = dpcm->frac_pos / HZ;
330 spin_unlock(&dpcm->lock);
331 return pos;
332 }
333
334 static int dummy_systimer_create(struct snd_pcm_substream *substream)
335 {
336 struct dummy_systimer_pcm *dpcm;
337
338 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
339 if (!dpcm)
340 return -ENOMEM;
341 substream->runtime->private_data = dpcm;
342 setup_timer(&dpcm->timer, dummy_systimer_callback,
343 (unsigned long) dpcm);
344 spin_lock_init(&dpcm->lock);
345 dpcm->substream = substream;
346 return 0;
347 }
348
349 static void dummy_systimer_free(struct snd_pcm_substream *substream)
350 {
351 kfree(substream->runtime->private_data);
352 }
353
354 static struct dummy_timer_ops dummy_systimer_ops = {
355 .create = dummy_systimer_create,
356 .free = dummy_systimer_free,
357 .prepare = dummy_systimer_prepare,
358 .start = dummy_systimer_start,
359 .stop = dummy_systimer_stop,
360 .pointer = dummy_systimer_pointer,
361 };
362
363 #ifdef CONFIG_HIGH_RES_TIMERS
364 /*
365 * hrtimer interface
366 */
367
368 struct dummy_hrtimer_pcm {
369 ktime_t base_time;
370 ktime_t period_time;
371 atomic_t running;
372 struct hrtimer timer;
373 struct tasklet_struct tasklet;
374 struct snd_pcm_substream *substream;
375 };
376
377 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
378 {
379 struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
380 if (atomic_read(&dpcm->running))
381 snd_pcm_period_elapsed(dpcm->substream);
382 }
383
384 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
385 {
386 struct dummy_hrtimer_pcm *dpcm;
387
388 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
389 if (!atomic_read(&dpcm->running))
390 return HRTIMER_NORESTART;
391 tasklet_schedule(&dpcm->tasklet);
392 hrtimer_forward_now(timer, dpcm->period_time);
393 return HRTIMER_RESTART;
394 }
395
396 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
397 {
398 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
399
400 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
401 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
402 atomic_set(&dpcm->running, 1);
403 return 0;
404 }
405
406 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
407 {
408 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
409
410 atomic_set(&dpcm->running, 0);
411 hrtimer_cancel(&dpcm->timer);
412 return 0;
413 }
414
415 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
416 {
417 tasklet_kill(&dpcm->tasklet);
418 }
419
420 static snd_pcm_uframes_t
421 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
422 {
423 struct snd_pcm_runtime *runtime = substream->runtime;
424 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
425 u64 delta;
426 u32 pos;
427
428 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
429 dpcm->base_time);
430 delta = div_u64(delta * runtime->rate + 999999, 1000000);
431 div_u64_rem(delta, runtime->buffer_size, &pos);
432 return pos;
433 }
434
435 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
436 {
437 struct snd_pcm_runtime *runtime = substream->runtime;
438 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
439 unsigned int period, rate;
440 long sec;
441 unsigned long nsecs;
442
443 dummy_hrtimer_sync(dpcm);
444 period = runtime->period_size;
445 rate = runtime->rate;
446 sec = period / rate;
447 period %= rate;
448 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
449 dpcm->period_time = ktime_set(sec, nsecs);
450
451 return 0;
452 }
453
454 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
455 {
456 struct dummy_hrtimer_pcm *dpcm;
457
458 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
459 if (!dpcm)
460 return -ENOMEM;
461 substream->runtime->private_data = dpcm;
462 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
463 dpcm->timer.function = dummy_hrtimer_callback;
464 dpcm->substream = substream;
465 atomic_set(&dpcm->running, 0);
466 tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
467 (unsigned long)dpcm);
468 return 0;
469 }
470
471 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
472 {
473 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
474 dummy_hrtimer_sync(dpcm);
475 kfree(dpcm);
476 }
477
478 static struct dummy_timer_ops dummy_hrtimer_ops = {
479 .create = dummy_hrtimer_create,
480 .free = dummy_hrtimer_free,
481 .prepare = dummy_hrtimer_prepare,
482 .start = dummy_hrtimer_start,
483 .stop = dummy_hrtimer_stop,
484 .pointer = dummy_hrtimer_pointer,
485 };
486
487 #endif /* CONFIG_HIGH_RES_TIMERS */
488
489 /*
490 * PCM interface
491 */
492
493 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
494 {
495 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
496
497 switch (cmd) {
498 case SNDRV_PCM_TRIGGER_START:
499 case SNDRV_PCM_TRIGGER_RESUME:
500 return dummy->timer_ops->start(substream);
501 case SNDRV_PCM_TRIGGER_STOP:
502 case SNDRV_PCM_TRIGGER_SUSPEND:
503 return dummy->timer_ops->stop(substream);
504 }
505 return -EINVAL;
506 }
507
508 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
509 {
510 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
511
512 return dummy->timer_ops->prepare(substream);
513 }
514
515 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
516 {
517 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
518
519 return dummy->timer_ops->pointer(substream);
520 }
521
522 static struct snd_pcm_hardware dummy_pcm_hardware = {
523 .info = (SNDRV_PCM_INFO_MMAP |
524 SNDRV_PCM_INFO_INTERLEAVED |
525 SNDRV_PCM_INFO_RESUME |
526 SNDRV_PCM_INFO_MMAP_VALID),
527 .formats = USE_FORMATS,
528 .rates = USE_RATE,
529 .rate_min = USE_RATE_MIN,
530 .rate_max = USE_RATE_MAX,
531 .channels_min = USE_CHANNELS_MIN,
532 .channels_max = USE_CHANNELS_MAX,
533 .buffer_bytes_max = MAX_BUFFER_SIZE,
534 .period_bytes_min = MIN_PERIOD_SIZE,
535 .period_bytes_max = MAX_PERIOD_SIZE,
536 .periods_min = USE_PERIODS_MIN,
537 .periods_max = USE_PERIODS_MAX,
538 .fifo_size = 0,
539 };
540
541 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
542 struct snd_pcm_hw_params *hw_params)
543 {
544 if (fake_buffer) {
545 /* runtime->dma_bytes has to be set manually to allow mmap */
546 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
547 return 0;
548 }
549 return snd_pcm_lib_malloc_pages(substream,
550 params_buffer_bytes(hw_params));
551 }
552
553 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
554 {
555 if (fake_buffer)
556 return 0;
557 return snd_pcm_lib_free_pages(substream);
558 }
559
560 static int dummy_pcm_open(struct snd_pcm_substream *substream)
561 {
562 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
563 struct dummy_model *model = dummy->model;
564 struct snd_pcm_runtime *runtime = substream->runtime;
565 int err;
566
567 dummy->timer_ops = &dummy_systimer_ops;
568 #ifdef CONFIG_HIGH_RES_TIMERS
569 if (hrtimer)
570 dummy->timer_ops = &dummy_hrtimer_ops;
571 #endif
572
573 err = dummy->timer_ops->create(substream);
574 if (err < 0)
575 return err;
576
577 runtime->hw = dummy->pcm_hw;
578 if (substream->pcm->device & 1) {
579 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
580 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
581 }
582 if (substream->pcm->device & 2)
583 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
584 SNDRV_PCM_INFO_MMAP_VALID);
585
586 if (model == NULL)
587 return 0;
588
589 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
590 if (model->playback_constraints)
591 err = model->playback_constraints(substream->runtime);
592 } else {
593 if (model->capture_constraints)
594 err = model->capture_constraints(substream->runtime);
595 }
596 if (err < 0) {
597 dummy->timer_ops->free(substream);
598 return err;
599 }
600 return 0;
601 }
602
603 static int dummy_pcm_close(struct snd_pcm_substream *substream)
604 {
605 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
606 dummy->timer_ops->free(substream);
607 return 0;
608 }
609
610 /*
611 * dummy buffer handling
612 */
613
614 static void *dummy_page[2];
615
616 static void free_fake_buffer(void)
617 {
618 if (fake_buffer) {
619 int i;
620 for (i = 0; i < 2; i++)
621 if (dummy_page[i]) {
622 free_page((unsigned long)dummy_page[i]);
623 dummy_page[i] = NULL;
624 }
625 }
626 }
627
628 static int alloc_fake_buffer(void)
629 {
630 int i;
631
632 if (!fake_buffer)
633 return 0;
634 for (i = 0; i < 2; i++) {
635 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
636 if (!dummy_page[i]) {
637 free_fake_buffer();
638 return -ENOMEM;
639 }
640 }
641 return 0;
642 }
643
644 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
645 int channel, snd_pcm_uframes_t pos,
646 void __user *dst, snd_pcm_uframes_t count)
647 {
648 return 0; /* do nothing */
649 }
650
651 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
652 int channel, snd_pcm_uframes_t pos,
653 snd_pcm_uframes_t count)
654 {
655 return 0; /* do nothing */
656 }
657
658 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
659 unsigned long offset)
660 {
661 return virt_to_page(dummy_page[substream->stream]); /* the same page */
662 }
663
664 static struct snd_pcm_ops dummy_pcm_ops = {
665 .open = dummy_pcm_open,
666 .close = dummy_pcm_close,
667 .ioctl = snd_pcm_lib_ioctl,
668 .hw_params = dummy_pcm_hw_params,
669 .hw_free = dummy_pcm_hw_free,
670 .prepare = dummy_pcm_prepare,
671 .trigger = dummy_pcm_trigger,
672 .pointer = dummy_pcm_pointer,
673 };
674
675 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
676 .open = dummy_pcm_open,
677 .close = dummy_pcm_close,
678 .ioctl = snd_pcm_lib_ioctl,
679 .hw_params = dummy_pcm_hw_params,
680 .hw_free = dummy_pcm_hw_free,
681 .prepare = dummy_pcm_prepare,
682 .trigger = dummy_pcm_trigger,
683 .pointer = dummy_pcm_pointer,
684 .copy = dummy_pcm_copy,
685 .silence = dummy_pcm_silence,
686 .page = dummy_pcm_page,
687 };
688
689 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
690 int substreams)
691 {
692 struct snd_pcm *pcm;
693 struct snd_pcm_ops *ops;
694 int err;
695
696 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
697 substreams, substreams, &pcm);
698 if (err < 0)
699 return err;
700 dummy->pcm = pcm;
701 if (fake_buffer)
702 ops = &dummy_pcm_ops_no_buf;
703 else
704 ops = &dummy_pcm_ops;
705 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
706 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
707 pcm->private_data = dummy;
708 pcm->info_flags = 0;
709 strcpy(pcm->name, "Dummy PCM");
710 if (!fake_buffer) {
711 snd_pcm_lib_preallocate_pages_for_all(pcm,
712 SNDRV_DMA_TYPE_CONTINUOUS,
713 snd_dma_continuous_data(GFP_KERNEL),
714 0, 64*1024);
715 }
716 return 0;
717 }
718
719 /*
720 * mixer interface
721 */
722
723 #define DUMMY_VOLUME(xname, xindex, addr) \
724 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
725 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
726 .name = xname, .index = xindex, \
727 .info = snd_dummy_volume_info, \
728 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
729 .private_value = addr, \
730 .tlv = { .p = db_scale_dummy } }
731
732 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
733 struct snd_ctl_elem_info *uinfo)
734 {
735 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
736 uinfo->count = 2;
737 uinfo->value.integer.min = -50;
738 uinfo->value.integer.max = 100;
739 return 0;
740 }
741
742 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
743 struct snd_ctl_elem_value *ucontrol)
744 {
745 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
746 int addr = kcontrol->private_value;
747
748 spin_lock_irq(&dummy->mixer_lock);
749 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
750 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
751 spin_unlock_irq(&dummy->mixer_lock);
752 return 0;
753 }
754
755 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
756 struct snd_ctl_elem_value *ucontrol)
757 {
758 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
759 int change, addr = kcontrol->private_value;
760 int left, right;
761
762 left = ucontrol->value.integer.value[0];
763 if (left < -50)
764 left = -50;
765 if (left > 100)
766 left = 100;
767 right = ucontrol->value.integer.value[1];
768 if (right < -50)
769 right = -50;
770 if (right > 100)
771 right = 100;
772 spin_lock_irq(&dummy->mixer_lock);
773 change = dummy->mixer_volume[addr][0] != left ||
774 dummy->mixer_volume[addr][1] != right;
775 dummy->mixer_volume[addr][0] = left;
776 dummy->mixer_volume[addr][1] = right;
777 spin_unlock_irq(&dummy->mixer_lock);
778 return change;
779 }
780
781 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
782
783 #define DUMMY_CAPSRC(xname, xindex, addr) \
784 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
785 .info = snd_dummy_capsrc_info, \
786 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
787 .private_value = addr }
788
789 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
790
791 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
792 struct snd_ctl_elem_value *ucontrol)
793 {
794 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
795 int addr = kcontrol->private_value;
796
797 spin_lock_irq(&dummy->mixer_lock);
798 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
799 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
800 spin_unlock_irq(&dummy->mixer_lock);
801 return 0;
802 }
803
804 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
805 {
806 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
807 int change, addr = kcontrol->private_value;
808 int left, right;
809
810 left = ucontrol->value.integer.value[0] & 1;
811 right = ucontrol->value.integer.value[1] & 1;
812 spin_lock_irq(&dummy->mixer_lock);
813 change = dummy->capture_source[addr][0] != left &&
814 dummy->capture_source[addr][1] != right;
815 dummy->capture_source[addr][0] = left;
816 dummy->capture_source[addr][1] = right;
817 spin_unlock_irq(&dummy->mixer_lock);
818 return change;
819 }
820
821 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
822 struct snd_ctl_elem_info *info)
823 {
824 const char *const names[] = { "None", "CD Player" };
825
826 return snd_ctl_enum_info(info, 1, 2, names);
827 }
828
829 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
830 struct snd_ctl_elem_value *value)
831 {
832 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
833
834 value->value.enumerated.item[0] = dummy->iobox;
835 return 0;
836 }
837
838 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
839 struct snd_ctl_elem_value *value)
840 {
841 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
842 int changed;
843
844 if (value->value.enumerated.item[0] > 1)
845 return -EINVAL;
846
847 changed = value->value.enumerated.item[0] != dummy->iobox;
848 if (changed) {
849 dummy->iobox = value->value.enumerated.item[0];
850
851 if (dummy->iobox) {
852 dummy->cd_volume_ctl->vd[0].access &=
853 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
854 dummy->cd_switch_ctl->vd[0].access &=
855 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
856 } else {
857 dummy->cd_volume_ctl->vd[0].access |=
858 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
859 dummy->cd_switch_ctl->vd[0].access |=
860 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
861 }
862
863 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
864 &dummy->cd_volume_ctl->id);
865 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
866 &dummy->cd_switch_ctl->id);
867 }
868
869 return changed;
870 }
871
872 static struct snd_kcontrol_new snd_dummy_controls[] = {
873 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
874 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
875 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
876 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
877 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
878 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
879 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
880 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
881 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
882 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
883 {
884 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
885 .name = "External I/O Box",
886 .info = snd_dummy_iobox_info,
887 .get = snd_dummy_iobox_get,
888 .put = snd_dummy_iobox_put,
889 },
890 };
891
892 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
893 {
894 struct snd_card *card = dummy->card;
895 struct snd_kcontrol *kcontrol;
896 unsigned int idx;
897 int err;
898
899 spin_lock_init(&dummy->mixer_lock);
900 strcpy(card->mixername, "Dummy Mixer");
901 dummy->iobox = 1;
902
903 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
904 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
905 err = snd_ctl_add(card, kcontrol);
906 if (err < 0)
907 return err;
908 if (!strcmp(kcontrol->id.name, "CD Volume"))
909 dummy->cd_volume_ctl = kcontrol;
910 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
911 dummy->cd_switch_ctl = kcontrol;
912
913 }
914 return 0;
915 }
916
917 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
918 /*
919 * proc interface
920 */
921 static void print_formats(struct snd_dummy *dummy,
922 struct snd_info_buffer *buffer)
923 {
924 int i;
925
926 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
927 if (dummy->pcm_hw.formats & (1ULL << i))
928 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
929 }
930 }
931
932 static void print_rates(struct snd_dummy *dummy,
933 struct snd_info_buffer *buffer)
934 {
935 static int rates[] = {
936 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
937 64000, 88200, 96000, 176400, 192000,
938 };
939 int i;
940
941 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
942 snd_iprintf(buffer, " continuous");
943 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
944 snd_iprintf(buffer, " knot");
945 for (i = 0; i < ARRAY_SIZE(rates); i++)
946 if (dummy->pcm_hw.rates & (1 << i))
947 snd_iprintf(buffer, " %d", rates[i]);
948 }
949
950 #define get_dummy_int_ptr(dummy, ofs) \
951 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
952 #define get_dummy_ll_ptr(dummy, ofs) \
953 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
954
955 struct dummy_hw_field {
956 const char *name;
957 const char *format;
958 unsigned int offset;
959 unsigned int size;
960 };
961 #define FIELD_ENTRY(item, fmt) { \
962 .name = #item, \
963 .format = fmt, \
964 .offset = offsetof(struct snd_pcm_hardware, item), \
965 .size = sizeof(dummy_pcm_hardware.item) }
966
967 static struct dummy_hw_field fields[] = {
968 FIELD_ENTRY(formats, "%#llx"),
969 FIELD_ENTRY(rates, "%#x"),
970 FIELD_ENTRY(rate_min, "%d"),
971 FIELD_ENTRY(rate_max, "%d"),
972 FIELD_ENTRY(channels_min, "%d"),
973 FIELD_ENTRY(channels_max, "%d"),
974 FIELD_ENTRY(buffer_bytes_max, "%ld"),
975 FIELD_ENTRY(period_bytes_min, "%ld"),
976 FIELD_ENTRY(period_bytes_max, "%ld"),
977 FIELD_ENTRY(periods_min, "%d"),
978 FIELD_ENTRY(periods_max, "%d"),
979 };
980
981 static void dummy_proc_read(struct snd_info_entry *entry,
982 struct snd_info_buffer *buffer)
983 {
984 struct snd_dummy *dummy = entry->private_data;
985 int i;
986
987 for (i = 0; i < ARRAY_SIZE(fields); i++) {
988 snd_iprintf(buffer, "%s ", fields[i].name);
989 if (fields[i].size == sizeof(int))
990 snd_iprintf(buffer, fields[i].format,
991 *get_dummy_int_ptr(dummy, fields[i].offset));
992 else
993 snd_iprintf(buffer, fields[i].format,
994 *get_dummy_ll_ptr(dummy, fields[i].offset));
995 if (!strcmp(fields[i].name, "formats"))
996 print_formats(dummy, buffer);
997 else if (!strcmp(fields[i].name, "rates"))
998 print_rates(dummy, buffer);
999 snd_iprintf(buffer, "\n");
1000 }
1001 }
1002
1003 static void dummy_proc_write(struct snd_info_entry *entry,
1004 struct snd_info_buffer *buffer)
1005 {
1006 struct snd_dummy *dummy = entry->private_data;
1007 char line[64];
1008
1009 while (!snd_info_get_line(buffer, line, sizeof(line))) {
1010 char item[20];
1011 const char *ptr;
1012 unsigned long long val;
1013 int i;
1014
1015 ptr = snd_info_get_str(item, line, sizeof(item));
1016 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1017 if (!strcmp(item, fields[i].name))
1018 break;
1019 }
1020 if (i >= ARRAY_SIZE(fields))
1021 continue;
1022 snd_info_get_str(item, ptr, sizeof(item));
1023 if (kstrtoull(item, 0, &val))
1024 continue;
1025 if (fields[i].size == sizeof(int))
1026 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1027 else
1028 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1029 }
1030 }
1031
1032 static void dummy_proc_init(struct snd_dummy *chip)
1033 {
1034 struct snd_info_entry *entry;
1035
1036 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1037 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1038 entry->c.text.write = dummy_proc_write;
1039 entry->mode |= S_IWUSR;
1040 entry->private_data = chip;
1041 }
1042 }
1043 #else
1044 #define dummy_proc_init(x)
1045 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
1046
1047 static int snd_dummy_probe(struct platform_device *devptr)
1048 {
1049 struct snd_card *card;
1050 struct snd_dummy *dummy;
1051 struct dummy_model *m = NULL, **mdl;
1052 int idx, err;
1053 int dev = devptr->id;
1054
1055 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1056 sizeof(struct snd_dummy), &card);
1057 if (err < 0)
1058 return err;
1059 dummy = card->private_data;
1060 dummy->card = card;
1061 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1062 if (strcmp(model[dev], (*mdl)->name) == 0) {
1063 printk(KERN_INFO
1064 "snd-dummy: Using model '%s' for card %i\n",
1065 (*mdl)->name, card->number);
1066 m = dummy->model = *mdl;
1067 break;
1068 }
1069 }
1070 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1071 if (pcm_substreams[dev] < 1)
1072 pcm_substreams[dev] = 1;
1073 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1074 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1075 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1076 if (err < 0)
1077 goto __nodev;
1078 }
1079
1080 dummy->pcm_hw = dummy_pcm_hardware;
1081 if (m) {
1082 if (m->formats)
1083 dummy->pcm_hw.formats = m->formats;
1084 if (m->buffer_bytes_max)
1085 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1086 if (m->period_bytes_min)
1087 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1088 if (m->period_bytes_max)
1089 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1090 if (m->periods_min)
1091 dummy->pcm_hw.periods_min = m->periods_min;
1092 if (m->periods_max)
1093 dummy->pcm_hw.periods_max = m->periods_max;
1094 if (m->rates)
1095 dummy->pcm_hw.rates = m->rates;
1096 if (m->rate_min)
1097 dummy->pcm_hw.rate_min = m->rate_min;
1098 if (m->rate_max)
1099 dummy->pcm_hw.rate_max = m->rate_max;
1100 if (m->channels_min)
1101 dummy->pcm_hw.channels_min = m->channels_min;
1102 if (m->channels_max)
1103 dummy->pcm_hw.channels_max = m->channels_max;
1104 }
1105
1106 err = snd_card_dummy_new_mixer(dummy);
1107 if (err < 0)
1108 goto __nodev;
1109 strcpy(card->driver, "Dummy");
1110 strcpy(card->shortname, "Dummy");
1111 sprintf(card->longname, "Dummy %i", dev + 1);
1112
1113 dummy_proc_init(dummy);
1114
1115 err = snd_card_register(card);
1116 if (err == 0) {
1117 platform_set_drvdata(devptr, card);
1118 return 0;
1119 }
1120 __nodev:
1121 snd_card_free(card);
1122 return err;
1123 }
1124
1125 static int snd_dummy_remove(struct platform_device *devptr)
1126 {
1127 snd_card_free(platform_get_drvdata(devptr));
1128 return 0;
1129 }
1130
1131 #ifdef CONFIG_PM_SLEEP
1132 static int snd_dummy_suspend(struct device *pdev)
1133 {
1134 struct snd_card *card = dev_get_drvdata(pdev);
1135 struct snd_dummy *dummy = card->private_data;
1136
1137 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1138 snd_pcm_suspend_all(dummy->pcm);
1139 return 0;
1140 }
1141
1142 static int snd_dummy_resume(struct device *pdev)
1143 {
1144 struct snd_card *card = dev_get_drvdata(pdev);
1145
1146 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1147 return 0;
1148 }
1149
1150 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1151 #define SND_DUMMY_PM_OPS &snd_dummy_pm
1152 #else
1153 #define SND_DUMMY_PM_OPS NULL
1154 #endif
1155
1156 #define SND_DUMMY_DRIVER "snd_dummy"
1157
1158 static struct platform_driver snd_dummy_driver = {
1159 .probe = snd_dummy_probe,
1160 .remove = snd_dummy_remove,
1161 .driver = {
1162 .name = SND_DUMMY_DRIVER,
1163 .pm = SND_DUMMY_PM_OPS,
1164 },
1165 };
1166
1167 static void snd_dummy_unregister_all(void)
1168 {
1169 int i;
1170
1171 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1172 platform_device_unregister(devices[i]);
1173 platform_driver_unregister(&snd_dummy_driver);
1174 free_fake_buffer();
1175 }
1176
1177 static int __init alsa_card_dummy_init(void)
1178 {
1179 int i, cards, err;
1180
1181 err = platform_driver_register(&snd_dummy_driver);
1182 if (err < 0)
1183 return err;
1184
1185 err = alloc_fake_buffer();
1186 if (err < 0) {
1187 platform_driver_unregister(&snd_dummy_driver);
1188 return err;
1189 }
1190
1191 cards = 0;
1192 for (i = 0; i < SNDRV_CARDS; i++) {
1193 struct platform_device *device;
1194 if (! enable[i])
1195 continue;
1196 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1197 i, NULL, 0);
1198 if (IS_ERR(device))
1199 continue;
1200 if (!platform_get_drvdata(device)) {
1201 platform_device_unregister(device);
1202 continue;
1203 }
1204 devices[i] = device;
1205 cards++;
1206 }
1207 if (!cards) {
1208 #ifdef MODULE
1209 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1210 #endif
1211 snd_dummy_unregister_all();
1212 return -ENODEV;
1213 }
1214 return 0;
1215 }
1216
1217 static void __exit alsa_card_dummy_exit(void)
1218 {
1219 snd_dummy_unregister_all();
1220 }
1221
1222 module_init(alsa_card_dummy_init)
1223 module_exit(alsa_card_dummy_exit)
Linux kernel - Deliverables
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