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kselftest: Move the docs to the Documentation dir
[linux/fpc-iii.git] / sound / drivers / dummy.c
blobfab90bd2bd5151ae1fcf44f8a7f9b444e1e323fe
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 dpcm->timer.expires = jiffies +
249 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
250 add_timer(&dpcm->timer);
251 }
252
253 static 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
272 static 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
282 static 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
291 static 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
306 static 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
322 static snd_pcm_uframes_t
323 dummy_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
335 static 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
351 static void dummy_systimer_free(struct snd_pcm_substream *substream)
352 {
353 kfree(substream->runtime->private_data);
354 }
355
356 static 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
370 struct 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
379 static 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
386 static 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
398 static 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
408 static 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
417 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
418 {
419 tasklet_kill(&dpcm->tasklet);
420 }
421
422 static snd_pcm_uframes_t
423 dummy_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
437 static 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
456 static 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
473 static 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
480 static 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
495 static 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
510 static 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
517 static 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
524 static 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
543 static 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
555 static 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
562 static 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
605 static 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
616 static void *dummy_page[2];
617
618 static 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
630 static 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
646 static 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
653 static 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
660 static 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
666 static 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
677 static 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
691 static 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
734 static 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
744 static 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
757 static 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
783 static 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
793 static 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
806 static 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
823 static 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
831 static 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
840 static 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
874 static struct snd_kcontrol_new snd_dummy_controls[] = {
875 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
876 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
877 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
878 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
879 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
880 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
881 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
882 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
883 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
884 DUMMY_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
894 static 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 */
923 static 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
934 static 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
957 struct 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
969 static 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
983 static 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
1005 static 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
1034 static 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
1049 static 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
1127 static 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
1134 static 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
1144 static 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
1152 static 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
1160 static 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
1170 static 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
1180 static 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
1220 static void __exit alsa_card_dummy_exit(void)
1221 {
1222 snd_dummy_unregister_all();
1223 }
1224
1225 module_init(alsa_card_dummy_init)
1226 module_exit(alsa_card_dummy_exit)
Linux with added FPC-III support