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Linux 4.18.10
[linux/fpc-iii.git] / sound / drivers / dummy.c
blob9af154db530a803943c9dc420d06e5a180d0789f
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
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 static struct dummy_model model_emu10k1 = {
162 .name = "emu10k1",
163 .playback_constraints = emu10k1_playback_constraints,
164 .buffer_bytes_max = 128 * 1024,
165 };
166
167 static 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 static 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 static 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 static 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 static 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 static 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
250 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
251 {
252 mod_timer(&dpcm->timer, jiffies +
253 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
254 }
255
256 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
257 {
258 unsigned long delta;
259
260 delta = jiffies - dpcm->base_time;
261 if (!delta)
262 return;
263 dpcm->base_time += delta;
264 delta *= dpcm->rate;
265 dpcm->frac_pos += delta;
266 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
267 dpcm->frac_pos -= dpcm->frac_buffer_size;
268 while (dpcm->frac_period_rest <= delta) {
269 dpcm->elapsed++;
270 dpcm->frac_period_rest += dpcm->frac_period_size;
271 }
272 dpcm->frac_period_rest -= delta;
273 }
274
275 static int dummy_systimer_start(struct snd_pcm_substream *substream)
276 {
277 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
278 spin_lock(&dpcm->lock);
279 dpcm->base_time = jiffies;
280 dummy_systimer_rearm(dpcm);
281 spin_unlock(&dpcm->lock);
282 return 0;
283 }
284
285 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
286 {
287 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
288 spin_lock(&dpcm->lock);
289 del_timer(&dpcm->timer);
290 spin_unlock(&dpcm->lock);
291 return 0;
292 }
293
294 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
295 {
296 struct snd_pcm_runtime *runtime = substream->runtime;
297 struct dummy_systimer_pcm *dpcm = runtime->private_data;
298
299 dpcm->frac_pos = 0;
300 dpcm->rate = runtime->rate;
301 dpcm->frac_buffer_size = runtime->buffer_size * HZ;
302 dpcm->frac_period_size = runtime->period_size * HZ;
303 dpcm->frac_period_rest = dpcm->frac_period_size;
304 dpcm->elapsed = 0;
305
306 return 0;
307 }
308
309 static void dummy_systimer_callback(struct timer_list *t)
310 {
311 struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer);
312 unsigned long flags;
313 int elapsed = 0;
314
315 spin_lock_irqsave(&dpcm->lock, flags);
316 dummy_systimer_update(dpcm);
317 dummy_systimer_rearm(dpcm);
318 elapsed = dpcm->elapsed;
319 dpcm->elapsed = 0;
320 spin_unlock_irqrestore(&dpcm->lock, flags);
321 if (elapsed)
322 snd_pcm_period_elapsed(dpcm->substream);
323 }
324
325 static snd_pcm_uframes_t
326 dummy_systimer_pointer(struct snd_pcm_substream *substream)
327 {
328 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
329 snd_pcm_uframes_t pos;
330
331 spin_lock(&dpcm->lock);
332 dummy_systimer_update(dpcm);
333 pos = dpcm->frac_pos / HZ;
334 spin_unlock(&dpcm->lock);
335 return pos;
336 }
337
338 static int dummy_systimer_create(struct snd_pcm_substream *substream)
339 {
340 struct dummy_systimer_pcm *dpcm;
341
342 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
343 if (!dpcm)
344 return -ENOMEM;
345 substream->runtime->private_data = dpcm;
346 timer_setup(&dpcm->timer, dummy_systimer_callback, 0);
347 spin_lock_init(&dpcm->lock);
348 dpcm->substream = substream;
349 return 0;
350 }
351
352 static void dummy_systimer_free(struct snd_pcm_substream *substream)
353 {
354 kfree(substream->runtime->private_data);
355 }
356
357 static const struct dummy_timer_ops dummy_systimer_ops = {
358 .create = dummy_systimer_create,
359 .free = dummy_systimer_free,
360 .prepare = dummy_systimer_prepare,
361 .start = dummy_systimer_start,
362 .stop = dummy_systimer_stop,
363 .pointer = dummy_systimer_pointer,
364 };
365
366 #ifdef CONFIG_HIGH_RES_TIMERS
367 /*
368 * hrtimer interface
369 */
370
371 struct dummy_hrtimer_pcm {
372 /* ops must be the first item */
373 const struct dummy_timer_ops *timer_ops;
374 ktime_t base_time;
375 ktime_t period_time;
376 atomic_t running;
377 struct hrtimer timer;
378 struct snd_pcm_substream *substream;
379 };
380
381 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
382 {
383 struct dummy_hrtimer_pcm *dpcm;
384
385 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
386 if (!atomic_read(&dpcm->running))
387 return HRTIMER_NORESTART;
388 /*
389 * In cases of XRUN and draining, this calls .trigger to stop PCM
390 * substream.
391 */
392 snd_pcm_period_elapsed(dpcm->substream);
393 if (!atomic_read(&dpcm->running))
394 return HRTIMER_NORESTART;
395
396 hrtimer_forward_now(timer, dpcm->period_time);
397 return HRTIMER_RESTART;
398 }
399
400 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
401 {
402 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
403
404 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
405 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT);
406 atomic_set(&dpcm->running, 1);
407 return 0;
408 }
409
410 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
411 {
412 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
413
414 atomic_set(&dpcm->running, 0);
415 if (!hrtimer_callback_running(&dpcm->timer))
416 hrtimer_cancel(&dpcm->timer);
417 return 0;
418 }
419
420 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
421 {
422 hrtimer_cancel(&dpcm->timer);
423 }
424
425 static snd_pcm_uframes_t
426 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
427 {
428 struct snd_pcm_runtime *runtime = substream->runtime;
429 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
430 u64 delta;
431 u32 pos;
432
433 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
434 dpcm->base_time);
435 delta = div_u64(delta * runtime->rate + 999999, 1000000);
436 div_u64_rem(delta, runtime->buffer_size, &pos);
437 return pos;
438 }
439
440 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
441 {
442 struct snd_pcm_runtime *runtime = substream->runtime;
443 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
444 unsigned int period, rate;
445 long sec;
446 unsigned long nsecs;
447
448 dummy_hrtimer_sync(dpcm);
449 period = runtime->period_size;
450 rate = runtime->rate;
451 sec = period / rate;
452 period %= rate;
453 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
454 dpcm->period_time = ktime_set(sec, nsecs);
455
456 return 0;
457 }
458
459 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
460 {
461 struct dummy_hrtimer_pcm *dpcm;
462
463 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
464 if (!dpcm)
465 return -ENOMEM;
466 substream->runtime->private_data = dpcm;
467 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
468 dpcm->timer.function = dummy_hrtimer_callback;
469 dpcm->substream = substream;
470 atomic_set(&dpcm->running, 0);
471 return 0;
472 }
473
474 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
475 {
476 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
477 dummy_hrtimer_sync(dpcm);
478 kfree(dpcm);
479 }
480
481 static const struct dummy_timer_ops dummy_hrtimer_ops = {
482 .create = dummy_hrtimer_create,
483 .free = dummy_hrtimer_free,
484 .prepare = dummy_hrtimer_prepare,
485 .start = dummy_hrtimer_start,
486 .stop = dummy_hrtimer_stop,
487 .pointer = dummy_hrtimer_pointer,
488 };
489
490 #endif /* CONFIG_HIGH_RES_TIMERS */
491
492 /*
493 * PCM interface
494 */
495
496 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
497 {
498 switch (cmd) {
499 case SNDRV_PCM_TRIGGER_START:
500 case SNDRV_PCM_TRIGGER_RESUME:
501 return get_dummy_ops(substream)->start(substream);
502 case SNDRV_PCM_TRIGGER_STOP:
503 case SNDRV_PCM_TRIGGER_SUSPEND:
504 return get_dummy_ops(substream)->stop(substream);
505 }
506 return -EINVAL;
507 }
508
509 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
510 {
511 return get_dummy_ops(substream)->prepare(substream);
512 }
513
514 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
515 {
516 return get_dummy_ops(substream)->pointer(substream);
517 }
518
519 static const struct snd_pcm_hardware dummy_pcm_hardware = {
520 .info = (SNDRV_PCM_INFO_MMAP |
521 SNDRV_PCM_INFO_INTERLEAVED |
522 SNDRV_PCM_INFO_RESUME |
523 SNDRV_PCM_INFO_MMAP_VALID),
524 .formats = USE_FORMATS,
525 .rates = USE_RATE,
526 .rate_min = USE_RATE_MIN,
527 .rate_max = USE_RATE_MAX,
528 .channels_min = USE_CHANNELS_MIN,
529 .channels_max = USE_CHANNELS_MAX,
530 .buffer_bytes_max = MAX_BUFFER_SIZE,
531 .period_bytes_min = MIN_PERIOD_SIZE,
532 .period_bytes_max = MAX_PERIOD_SIZE,
533 .periods_min = USE_PERIODS_MIN,
534 .periods_max = USE_PERIODS_MAX,
535 .fifo_size = 0,
536 };
537
538 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
539 struct snd_pcm_hw_params *hw_params)
540 {
541 if (fake_buffer) {
542 /* runtime->dma_bytes has to be set manually to allow mmap */
543 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
544 return 0;
545 }
546 return snd_pcm_lib_malloc_pages(substream,
547 params_buffer_bytes(hw_params));
548 }
549
550 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
551 {
552 if (fake_buffer)
553 return 0;
554 return snd_pcm_lib_free_pages(substream);
555 }
556
557 static int dummy_pcm_open(struct snd_pcm_substream *substream)
558 {
559 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
560 struct dummy_model *model = dummy->model;
561 struct snd_pcm_runtime *runtime = substream->runtime;
562 const struct dummy_timer_ops *ops;
563 int err;
564
565 ops = &dummy_systimer_ops;
566 #ifdef CONFIG_HIGH_RES_TIMERS
567 if (hrtimer)
568 ops = &dummy_hrtimer_ops;
569 #endif
570
571 err = ops->create(substream);
572 if (err < 0)
573 return err;
574 get_dummy_ops(substream) = ops;
575
576 runtime->hw = dummy->pcm_hw;
577 if (substream->pcm->device & 1) {
578 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
579 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
580 }
581 if (substream->pcm->device & 2)
582 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
583 SNDRV_PCM_INFO_MMAP_VALID);
584
585 if (model == NULL)
586 return 0;
587
588 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
589 if (model->playback_constraints)
590 err = model->playback_constraints(substream->runtime);
591 } else {
592 if (model->capture_constraints)
593 err = model->capture_constraints(substream->runtime);
594 }
595 if (err < 0) {
596 get_dummy_ops(substream)->free(substream);
597 return err;
598 }
599 return 0;
600 }
601
602 static int dummy_pcm_close(struct snd_pcm_substream *substream)
603 {
604 get_dummy_ops(substream)->free(substream);
605 return 0;
606 }
607
608 /*
609 * dummy buffer handling
610 */
611
612 static void *dummy_page[2];
613
614 static void free_fake_buffer(void)
615 {
616 if (fake_buffer) {
617 int i;
618 for (i = 0; i < 2; i++)
619 if (dummy_page[i]) {
620 free_page((unsigned long)dummy_page[i]);
621 dummy_page[i] = NULL;
622 }
623 }
624 }
625
626 static int alloc_fake_buffer(void)
627 {
628 int i;
629
630 if (!fake_buffer)
631 return 0;
632 for (i = 0; i < 2; i++) {
633 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
634 if (!dummy_page[i]) {
635 free_fake_buffer();
636 return -ENOMEM;
637 }
638 }
639 return 0;
640 }
641
642 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
643 int channel, unsigned long pos,
644 void __user *dst, unsigned long bytes)
645 {
646 return 0; /* do nothing */
647 }
648
649 static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
650 int channel, unsigned long pos,
651 void *dst, unsigned long bytes)
652 {
653 return 0; /* do nothing */
654 }
655
656 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
657 int channel, unsigned long pos,
658 unsigned long bytes)
659 {
660 return 0; /* do nothing */
661 }
662
663 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
664 unsigned long offset)
665 {
666 return virt_to_page(dummy_page[substream->stream]); /* the same page */
667 }
668
669 static struct snd_pcm_ops dummy_pcm_ops = {
670 .open = dummy_pcm_open,
671 .close = dummy_pcm_close,
672 .ioctl = snd_pcm_lib_ioctl,
673 .hw_params = dummy_pcm_hw_params,
674 .hw_free = dummy_pcm_hw_free,
675 .prepare = dummy_pcm_prepare,
676 .trigger = dummy_pcm_trigger,
677 .pointer = dummy_pcm_pointer,
678 };
679
680 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
681 .open = dummy_pcm_open,
682 .close = dummy_pcm_close,
683 .ioctl = snd_pcm_lib_ioctl,
684 .hw_params = dummy_pcm_hw_params,
685 .hw_free = dummy_pcm_hw_free,
686 .prepare = dummy_pcm_prepare,
687 .trigger = dummy_pcm_trigger,
688 .pointer = dummy_pcm_pointer,
689 .copy_user = dummy_pcm_copy,
690 .copy_kernel = dummy_pcm_copy_kernel,
691 .fill_silence = dummy_pcm_silence,
692 .page = dummy_pcm_page,
693 };
694
695 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
696 int substreams)
697 {
698 struct snd_pcm *pcm;
699 struct snd_pcm_ops *ops;
700 int err;
701
702 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
703 substreams, substreams, &pcm);
704 if (err < 0)
705 return err;
706 dummy->pcm = pcm;
707 if (fake_buffer)
708 ops = &dummy_pcm_ops_no_buf;
709 else
710 ops = &dummy_pcm_ops;
711 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
712 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
713 pcm->private_data = dummy;
714 pcm->info_flags = 0;
715 strcpy(pcm->name, "Dummy PCM");
716 if (!fake_buffer) {
717 snd_pcm_lib_preallocate_pages_for_all(pcm,
718 SNDRV_DMA_TYPE_CONTINUOUS,
719 snd_dma_continuous_data(GFP_KERNEL),
720 0, 64*1024);
721 }
722 return 0;
723 }
724
725 /*
726 * mixer interface
727 */
728
729 #define DUMMY_VOLUME(xname, xindex, addr) \
730 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
731 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
732 .name = xname, .index = xindex, \
733 .info = snd_dummy_volume_info, \
734 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
735 .private_value = addr, \
736 .tlv = { .p = db_scale_dummy } }
737
738 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
739 struct snd_ctl_elem_info *uinfo)
740 {
741 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
742 uinfo->count = 2;
743 uinfo->value.integer.min = -50;
744 uinfo->value.integer.max = 100;
745 return 0;
746 }
747
748 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
749 struct snd_ctl_elem_value *ucontrol)
750 {
751 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
752 int addr = kcontrol->private_value;
753
754 spin_lock_irq(&dummy->mixer_lock);
755 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
756 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
757 spin_unlock_irq(&dummy->mixer_lock);
758 return 0;
759 }
760
761 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
762 struct snd_ctl_elem_value *ucontrol)
763 {
764 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
765 int change, addr = kcontrol->private_value;
766 int left, right;
767
768 left = ucontrol->value.integer.value[0];
769 if (left < -50)
770 left = -50;
771 if (left > 100)
772 left = 100;
773 right = ucontrol->value.integer.value[1];
774 if (right < -50)
775 right = -50;
776 if (right > 100)
777 right = 100;
778 spin_lock_irq(&dummy->mixer_lock);
779 change = dummy->mixer_volume[addr][0] != left ||
780 dummy->mixer_volume[addr][1] != right;
781 dummy->mixer_volume[addr][0] = left;
782 dummy->mixer_volume[addr][1] = right;
783 spin_unlock_irq(&dummy->mixer_lock);
784 return change;
785 }
786
787 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
788
789 #define DUMMY_CAPSRC(xname, xindex, addr) \
790 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
791 .info = snd_dummy_capsrc_info, \
792 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
793 .private_value = addr }
794
795 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
796
797 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
798 struct snd_ctl_elem_value *ucontrol)
799 {
800 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
801 int addr = kcontrol->private_value;
802
803 spin_lock_irq(&dummy->mixer_lock);
804 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
805 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
806 spin_unlock_irq(&dummy->mixer_lock);
807 return 0;
808 }
809
810 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
811 {
812 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
813 int change, addr = kcontrol->private_value;
814 int left, right;
815
816 left = ucontrol->value.integer.value[0] & 1;
817 right = ucontrol->value.integer.value[1] & 1;
818 spin_lock_irq(&dummy->mixer_lock);
819 change = dummy->capture_source[addr][0] != left &&
820 dummy->capture_source[addr][1] != right;
821 dummy->capture_source[addr][0] = left;
822 dummy->capture_source[addr][1] = right;
823 spin_unlock_irq(&dummy->mixer_lock);
824 return change;
825 }
826
827 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
828 struct snd_ctl_elem_info *info)
829 {
830 static const char *const names[] = { "None", "CD Player" };
831
832 return snd_ctl_enum_info(info, 1, 2, names);
833 }
834
835 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
836 struct snd_ctl_elem_value *value)
837 {
838 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
839
840 value->value.enumerated.item[0] = dummy->iobox;
841 return 0;
842 }
843
844 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
845 struct snd_ctl_elem_value *value)
846 {
847 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
848 int changed;
849
850 if (value->value.enumerated.item[0] > 1)
851 return -EINVAL;
852
853 changed = value->value.enumerated.item[0] != dummy->iobox;
854 if (changed) {
855 dummy->iobox = value->value.enumerated.item[0];
856
857 if (dummy->iobox) {
858 dummy->cd_volume_ctl->vd[0].access &=
859 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
860 dummy->cd_switch_ctl->vd[0].access &=
861 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
862 } else {
863 dummy->cd_volume_ctl->vd[0].access |=
864 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
865 dummy->cd_switch_ctl->vd[0].access |=
866 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
867 }
868
869 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
870 &dummy->cd_volume_ctl->id);
871 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
872 &dummy->cd_switch_ctl->id);
873 }
874
875 return changed;
876 }
877
878 static struct snd_kcontrol_new snd_dummy_controls[] = {
879 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
880 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
881 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
882 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
883 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
884 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
885 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
886 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
887 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
888 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
889 {
890 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
891 .name = "External I/O Box",
892 .info = snd_dummy_iobox_info,
893 .get = snd_dummy_iobox_get,
894 .put = snd_dummy_iobox_put,
895 },
896 };
897
898 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
899 {
900 struct snd_card *card = dummy->card;
901 struct snd_kcontrol *kcontrol;
902 unsigned int idx;
903 int err;
904
905 spin_lock_init(&dummy->mixer_lock);
906 strcpy(card->mixername, "Dummy Mixer");
907 dummy->iobox = 1;
908
909 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
910 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
911 err = snd_ctl_add(card, kcontrol);
912 if (err < 0)
913 return err;
914 if (!strcmp(kcontrol->id.name, "CD Volume"))
915 dummy->cd_volume_ctl = kcontrol;
916 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
917 dummy->cd_switch_ctl = kcontrol;
918
919 }
920 return 0;
921 }
922
923 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
924 /*
925 * proc interface
926 */
927 static void print_formats(struct snd_dummy *dummy,
928 struct snd_info_buffer *buffer)
929 {
930 int i;
931
932 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
933 if (dummy->pcm_hw.formats & (1ULL << i))
934 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
935 }
936 }
937
938 static void print_rates(struct snd_dummy *dummy,
939 struct snd_info_buffer *buffer)
940 {
941 static int rates[] = {
942 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
943 64000, 88200, 96000, 176400, 192000,
944 };
945 int i;
946
947 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
948 snd_iprintf(buffer, " continuous");
949 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
950 snd_iprintf(buffer, " knot");
951 for (i = 0; i < ARRAY_SIZE(rates); i++)
952 if (dummy->pcm_hw.rates & (1 << i))
953 snd_iprintf(buffer, " %d", rates[i]);
954 }
955
956 #define get_dummy_int_ptr(dummy, ofs) \
957 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
958 #define get_dummy_ll_ptr(dummy, ofs) \
959 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
960
961 struct dummy_hw_field {
962 const char *name;
963 const char *format;
964 unsigned int offset;
965 unsigned int size;
966 };
967 #define FIELD_ENTRY(item, fmt) { \
968 .name = #item, \
969 .format = fmt, \
970 .offset = offsetof(struct snd_pcm_hardware, item), \
971 .size = sizeof(dummy_pcm_hardware.item) }
972
973 static struct dummy_hw_field fields[] = {
974 FIELD_ENTRY(formats, "%#llx"),
975 FIELD_ENTRY(rates, "%#x"),
976 FIELD_ENTRY(rate_min, "%d"),
977 FIELD_ENTRY(rate_max, "%d"),
978 FIELD_ENTRY(channels_min, "%d"),
979 FIELD_ENTRY(channels_max, "%d"),
980 FIELD_ENTRY(buffer_bytes_max, "%ld"),
981 FIELD_ENTRY(period_bytes_min, "%ld"),
982 FIELD_ENTRY(period_bytes_max, "%ld"),
983 FIELD_ENTRY(periods_min, "%d"),
984 FIELD_ENTRY(periods_max, "%d"),
985 };
986
987 static void dummy_proc_read(struct snd_info_entry *entry,
988 struct snd_info_buffer *buffer)
989 {
990 struct snd_dummy *dummy = entry->private_data;
991 int i;
992
993 for (i = 0; i < ARRAY_SIZE(fields); i++) {
994 snd_iprintf(buffer, "%s ", fields[i].name);
995 if (fields[i].size == sizeof(int))
996 snd_iprintf(buffer, fields[i].format,
997 *get_dummy_int_ptr(dummy, fields[i].offset));
998 else
999 snd_iprintf(buffer, fields[i].format,
1000 *get_dummy_ll_ptr(dummy, fields[i].offset));
1001 if (!strcmp(fields[i].name, "formats"))
1002 print_formats(dummy, buffer);
1003 else if (!strcmp(fields[i].name, "rates"))
1004 print_rates(dummy, buffer);
1005 snd_iprintf(buffer, "\n");
1006 }
1007 }
1008
1009 static void dummy_proc_write(struct snd_info_entry *entry,
1010 struct snd_info_buffer *buffer)
1011 {
1012 struct snd_dummy *dummy = entry->private_data;
1013 char line[64];
1014
1015 while (!snd_info_get_line(buffer, line, sizeof(line))) {
1016 char item[20];
1017 const char *ptr;
1018 unsigned long long val;
1019 int i;
1020
1021 ptr = snd_info_get_str(item, line, sizeof(item));
1022 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1023 if (!strcmp(item, fields[i].name))
1024 break;
1025 }
1026 if (i >= ARRAY_SIZE(fields))
1027 continue;
1028 snd_info_get_str(item, ptr, sizeof(item));
1029 if (kstrtoull(item, 0, &val))
1030 continue;
1031 if (fields[i].size == sizeof(int))
1032 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1033 else
1034 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1035 }
1036 }
1037
1038 static void dummy_proc_init(struct snd_dummy *chip)
1039 {
1040 struct snd_info_entry *entry;
1041
1042 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1043 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1044 entry->c.text.write = dummy_proc_write;
1045 entry->mode |= 0200;
1046 entry->private_data = chip;
1047 }
1048 }
1049 #else
1050 #define dummy_proc_init(x)
1051 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1052
1053 static int snd_dummy_probe(struct platform_device *devptr)
1054 {
1055 struct snd_card *card;
1056 struct snd_dummy *dummy;
1057 struct dummy_model *m = NULL, **mdl;
1058 int idx, err;
1059 int dev = devptr->id;
1060
1061 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1062 sizeof(struct snd_dummy), &card);
1063 if (err < 0)
1064 return err;
1065 dummy = card->private_data;
1066 dummy->card = card;
1067 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1068 if (strcmp(model[dev], (*mdl)->name) == 0) {
1069 printk(KERN_INFO
1070 "snd-dummy: Using model '%s' for card %i\n",
1071 (*mdl)->name, card->number);
1072 m = dummy->model = *mdl;
1073 break;
1074 }
1075 }
1076 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1077 if (pcm_substreams[dev] < 1)
1078 pcm_substreams[dev] = 1;
1079 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1080 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1081 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1082 if (err < 0)
1083 goto __nodev;
1084 }
1085
1086 dummy->pcm_hw = dummy_pcm_hardware;
1087 if (m) {
1088 if (m->formats)
1089 dummy->pcm_hw.formats = m->formats;
1090 if (m->buffer_bytes_max)
1091 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1092 if (m->period_bytes_min)
1093 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1094 if (m->period_bytes_max)
1095 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1096 if (m->periods_min)
1097 dummy->pcm_hw.periods_min = m->periods_min;
1098 if (m->periods_max)
1099 dummy->pcm_hw.periods_max = m->periods_max;
1100 if (m->rates)
1101 dummy->pcm_hw.rates = m->rates;
1102 if (m->rate_min)
1103 dummy->pcm_hw.rate_min = m->rate_min;
1104 if (m->rate_max)
1105 dummy->pcm_hw.rate_max = m->rate_max;
1106 if (m->channels_min)
1107 dummy->pcm_hw.channels_min = m->channels_min;
1108 if (m->channels_max)
1109 dummy->pcm_hw.channels_max = m->channels_max;
1110 }
1111
1112 err = snd_card_dummy_new_mixer(dummy);
1113 if (err < 0)
1114 goto __nodev;
1115 strcpy(card->driver, "Dummy");
1116 strcpy(card->shortname, "Dummy");
1117 sprintf(card->longname, "Dummy %i", dev + 1);
1118
1119 dummy_proc_init(dummy);
1120
1121 err = snd_card_register(card);
1122 if (err == 0) {
1123 platform_set_drvdata(devptr, card);
1124 return 0;
1125 }
1126 __nodev:
1127 snd_card_free(card);
1128 return err;
1129 }
1130
1131 static int snd_dummy_remove(struct platform_device *devptr)
1132 {
1133 snd_card_free(platform_get_drvdata(devptr));
1134 return 0;
1135 }
1136
1137 #ifdef CONFIG_PM_SLEEP
1138 static int snd_dummy_suspend(struct device *pdev)
1139 {
1140 struct snd_card *card = dev_get_drvdata(pdev);
1141 struct snd_dummy *dummy = card->private_data;
1142
1143 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1144 snd_pcm_suspend_all(dummy->pcm);
1145 return 0;
1146 }
1147
1148 static int snd_dummy_resume(struct device *pdev)
1149 {
1150 struct snd_card *card = dev_get_drvdata(pdev);
1151
1152 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1153 return 0;
1154 }
1155
1156 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1157 #define SND_DUMMY_PM_OPS &snd_dummy_pm
1158 #else
1159 #define SND_DUMMY_PM_OPS NULL
1160 #endif
1161
1162 #define SND_DUMMY_DRIVER "snd_dummy"
1163
1164 static struct platform_driver snd_dummy_driver = {
1165 .probe = snd_dummy_probe,
1166 .remove = snd_dummy_remove,
1167 .driver = {
1168 .name = SND_DUMMY_DRIVER,
1169 .pm = SND_DUMMY_PM_OPS,
1170 },
1171 };
1172
1173 static void snd_dummy_unregister_all(void)
1174 {
1175 int i;
1176
1177 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1178 platform_device_unregister(devices[i]);
1179 platform_driver_unregister(&snd_dummy_driver);
1180 free_fake_buffer();
1181 }
1182
1183 static int __init alsa_card_dummy_init(void)
1184 {
1185 int i, cards, err;
1186
1187 err = platform_driver_register(&snd_dummy_driver);
1188 if (err < 0)
1189 return err;
1190
1191 err = alloc_fake_buffer();
1192 if (err < 0) {
1193 platform_driver_unregister(&snd_dummy_driver);
1194 return err;
1195 }
1196
1197 cards = 0;
1198 for (i = 0; i < SNDRV_CARDS; i++) {
1199 struct platform_device *device;
1200 if (! enable[i])
1201 continue;
1202 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1203 i, NULL, 0);
1204 if (IS_ERR(device))
1205 continue;
1206 if (!platform_get_drvdata(device)) {
1207 platform_device_unregister(device);
1208 continue;
1209 }
1210 devices[i] = device;
1211 cards++;
1212 }
1213 if (!cards) {
1214 #ifdef MODULE
1215 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1216 #endif
1217 snd_dummy_unregister_all();
1218 return -ENODEV;
1219 }
1220 return 0;
1221 }
1222
1223 static void __exit alsa_card_dummy_exit(void)
1224 {
1225 snd_dummy_unregister_all();
1226 }
1227
1228 module_init(alsa_card_dummy_init)
1229 module_exit(alsa_card_dummy_exit)
Linux with added FPC-III support