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Cleanup handling of NULL value passed for a mount option
[linux/fpc-iii.git] / sound / drivers / dummy.c
blobad9434fd6370d87afef124954b6a0adb56736354
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 const struct dummy_timer_ops *timer_ops;
138 };
139
140 /*
141 * card models
142 */
143
144 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
145 {
146 int err;
147 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
148 if (err < 0)
149 return err;
150 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
151 if (err < 0)
152 return err;
153 return 0;
154 }
155
156 struct dummy_model model_emu10k1 = {
157 .name = "emu10k1",
158 .playback_constraints = emu10k1_playback_constraints,
159 .buffer_bytes_max = 128 * 1024,
160 };
161
162 struct dummy_model model_rme9652 = {
163 .name = "rme9652",
164 .buffer_bytes_max = 26 * 64 * 1024,
165 .formats = SNDRV_PCM_FMTBIT_S32_LE,
166 .channels_min = 26,
167 .channels_max = 26,
168 .periods_min = 2,
169 .periods_max = 2,
170 };
171
172 struct dummy_model model_ice1712 = {
173 .name = "ice1712",
174 .buffer_bytes_max = 256 * 1024,
175 .formats = SNDRV_PCM_FMTBIT_S32_LE,
176 .channels_min = 10,
177 .channels_max = 10,
178 .periods_min = 1,
179 .periods_max = 1024,
180 };
181
182 struct dummy_model model_uda1341 = {
183 .name = "uda1341",
184 .buffer_bytes_max = 16380,
185 .formats = SNDRV_PCM_FMTBIT_S16_LE,
186 .channels_min = 2,
187 .channels_max = 2,
188 .periods_min = 2,
189 .periods_max = 255,
190 };
191
192 struct dummy_model model_ac97 = {
193 .name = "ac97",
194 .formats = SNDRV_PCM_FMTBIT_S16_LE,
195 .channels_min = 2,
196 .channels_max = 2,
197 .rates = SNDRV_PCM_RATE_48000,
198 .rate_min = 48000,
199 .rate_max = 48000,
200 };
201
202 struct dummy_model model_ca0106 = {
203 .name = "ca0106",
204 .formats = SNDRV_PCM_FMTBIT_S16_LE,
205 .buffer_bytes_max = ((65536-64)*8),
206 .period_bytes_max = (65536-64),
207 .periods_min = 2,
208 .periods_max = 8,
209 .channels_min = 2,
210 .channels_max = 2,
211 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
212 .rate_min = 48000,
213 .rate_max = 192000,
214 };
215
216 struct dummy_model *dummy_models[] = {
217 &model_emu10k1,
218 &model_rme9652,
219 &model_ice1712,
220 &model_uda1341,
221 &model_ac97,
222 &model_ca0106,
223 NULL
224 };
225
226 /*
227 * system timer interface
228 */
229
230 struct dummy_systimer_pcm {
231 spinlock_t lock;
232 struct timer_list timer;
233 unsigned long base_time;
234 unsigned int frac_pos; /* fractional sample position (based HZ) */
235 unsigned int frac_period_rest;
236 unsigned int frac_buffer_size; /* buffer_size * HZ */
237 unsigned int frac_period_size; /* period_size * HZ */
238 unsigned int rate;
239 int elapsed;
240 struct snd_pcm_substream *substream;
241 };
242
243 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
244 {
245 dpcm->timer.expires = jiffies +
246 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
247 add_timer(&dpcm->timer);
248 }
249
250 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
251 {
252 unsigned long delta;
253
254 delta = jiffies - dpcm->base_time;
255 if (!delta)
256 return;
257 dpcm->base_time += delta;
258 delta *= dpcm->rate;
259 dpcm->frac_pos += delta;
260 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
261 dpcm->frac_pos -= dpcm->frac_buffer_size;
262 while (dpcm->frac_period_rest <= delta) {
263 dpcm->elapsed++;
264 dpcm->frac_period_rest += dpcm->frac_period_size;
265 }
266 dpcm->frac_period_rest -= delta;
267 }
268
269 static int dummy_systimer_start(struct snd_pcm_substream *substream)
270 {
271 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
272 spin_lock(&dpcm->lock);
273 dpcm->base_time = jiffies;
274 dummy_systimer_rearm(dpcm);
275 spin_unlock(&dpcm->lock);
276 return 0;
277 }
278
279 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
280 {
281 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
282 spin_lock(&dpcm->lock);
283 del_timer(&dpcm->timer);
284 spin_unlock(&dpcm->lock);
285 return 0;
286 }
287
288 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
289 {
290 struct snd_pcm_runtime *runtime = substream->runtime;
291 struct dummy_systimer_pcm *dpcm = runtime->private_data;
292
293 dpcm->frac_pos = 0;
294 dpcm->rate = runtime->rate;
295 dpcm->frac_buffer_size = runtime->buffer_size * HZ;
296 dpcm->frac_period_size = runtime->period_size * HZ;
297 dpcm->frac_period_rest = dpcm->frac_period_size;
298 dpcm->elapsed = 0;
299
300 return 0;
301 }
302
303 static void dummy_systimer_callback(unsigned long data)
304 {
305 struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
306 unsigned long flags;
307 int elapsed = 0;
308
309 spin_lock_irqsave(&dpcm->lock, flags);
310 dummy_systimer_update(dpcm);
311 dummy_systimer_rearm(dpcm);
312 elapsed = dpcm->elapsed;
313 dpcm->elapsed = 0;
314 spin_unlock_irqrestore(&dpcm->lock, flags);
315 if (elapsed)
316 snd_pcm_period_elapsed(dpcm->substream);
317 }
318
319 static snd_pcm_uframes_t
320 dummy_systimer_pointer(struct snd_pcm_substream *substream)
321 {
322 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
323 snd_pcm_uframes_t pos;
324
325 spin_lock(&dpcm->lock);
326 dummy_systimer_update(dpcm);
327 pos = dpcm->frac_pos / HZ;
328 spin_unlock(&dpcm->lock);
329 return pos;
330 }
331
332 static int dummy_systimer_create(struct snd_pcm_substream *substream)
333 {
334 struct dummy_systimer_pcm *dpcm;
335
336 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
337 if (!dpcm)
338 return -ENOMEM;
339 substream->runtime->private_data = dpcm;
340 init_timer(&dpcm->timer);
341 dpcm->timer.data = (unsigned long) dpcm;
342 dpcm->timer.function = dummy_systimer_callback;
343 spin_lock_init(&dpcm->lock);
344 dpcm->substream = substream;
345 return 0;
346 }
347
348 static void dummy_systimer_free(struct snd_pcm_substream *substream)
349 {
350 kfree(substream->runtime->private_data);
351 }
352
353 static struct dummy_timer_ops dummy_systimer_ops = {
354 .create = dummy_systimer_create,
355 .free = dummy_systimer_free,
356 .prepare = dummy_systimer_prepare,
357 .start = dummy_systimer_start,
358 .stop = dummy_systimer_stop,
359 .pointer = dummy_systimer_pointer,
360 };
361
362 #ifdef CONFIG_HIGH_RES_TIMERS
363 /*
364 * hrtimer interface
365 */
366
367 struct dummy_hrtimer_pcm {
368 ktime_t base_time;
369 ktime_t period_time;
370 atomic_t running;
371 struct hrtimer timer;
372 struct tasklet_struct tasklet;
373 struct snd_pcm_substream *substream;
374 };
375
376 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
377 {
378 struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
379 if (atomic_read(&dpcm->running))
380 snd_pcm_period_elapsed(dpcm->substream);
381 }
382
383 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
384 {
385 struct dummy_hrtimer_pcm *dpcm;
386
387 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
388 if (!atomic_read(&dpcm->running))
389 return HRTIMER_NORESTART;
390 tasklet_schedule(&dpcm->tasklet);
391 hrtimer_forward_now(timer, dpcm->period_time);
392 return HRTIMER_RESTART;
393 }
394
395 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
396 {
397 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
398
399 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
400 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
401 atomic_set(&dpcm->running, 1);
402 return 0;
403 }
404
405 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
406 {
407 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
408
409 atomic_set(&dpcm->running, 0);
410 hrtimer_cancel(&dpcm->timer);
411 return 0;
412 }
413
414 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
415 {
416 tasklet_kill(&dpcm->tasklet);
417 }
418
419 static snd_pcm_uframes_t
420 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
421 {
422 struct snd_pcm_runtime *runtime = substream->runtime;
423 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
424 u64 delta;
425 u32 pos;
426
427 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
428 dpcm->base_time);
429 delta = div_u64(delta * runtime->rate + 999999, 1000000);
430 div_u64_rem(delta, runtime->buffer_size, &pos);
431 return pos;
432 }
433
434 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
435 {
436 struct snd_pcm_runtime *runtime = substream->runtime;
437 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
438 unsigned int period, rate;
439 long sec;
440 unsigned long nsecs;
441
442 dummy_hrtimer_sync(dpcm);
443 period = runtime->period_size;
444 rate = runtime->rate;
445 sec = period / rate;
446 period %= rate;
447 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
448 dpcm->period_time = ktime_set(sec, nsecs);
449
450 return 0;
451 }
452
453 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
454 {
455 struct dummy_hrtimer_pcm *dpcm;
456
457 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
458 if (!dpcm)
459 return -ENOMEM;
460 substream->runtime->private_data = dpcm;
461 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
462 dpcm->timer.function = dummy_hrtimer_callback;
463 dpcm->substream = substream;
464 atomic_set(&dpcm->running, 0);
465 tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
466 (unsigned long)dpcm);
467 return 0;
468 }
469
470 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
471 {
472 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
473 dummy_hrtimer_sync(dpcm);
474 kfree(dpcm);
475 }
476
477 static struct dummy_timer_ops dummy_hrtimer_ops = {
478 .create = dummy_hrtimer_create,
479 .free = dummy_hrtimer_free,
480 .prepare = dummy_hrtimer_prepare,
481 .start = dummy_hrtimer_start,
482 .stop = dummy_hrtimer_stop,
483 .pointer = dummy_hrtimer_pointer,
484 };
485
486 #endif /* CONFIG_HIGH_RES_TIMERS */
487
488 /*
489 * PCM interface
490 */
491
492 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
493 {
494 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
495
496 switch (cmd) {
497 case SNDRV_PCM_TRIGGER_START:
498 case SNDRV_PCM_TRIGGER_RESUME:
499 return dummy->timer_ops->start(substream);
500 case SNDRV_PCM_TRIGGER_STOP:
501 case SNDRV_PCM_TRIGGER_SUSPEND:
502 return dummy->timer_ops->stop(substream);
503 }
504 return -EINVAL;
505 }
506
507 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
508 {
509 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
510
511 return dummy->timer_ops->prepare(substream);
512 }
513
514 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
515 {
516 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
517
518 return dummy->timer_ops->pointer(substream);
519 }
520
521 static struct snd_pcm_hardware dummy_pcm_hardware = {
522 .info = (SNDRV_PCM_INFO_MMAP |
523 SNDRV_PCM_INFO_INTERLEAVED |
524 SNDRV_PCM_INFO_RESUME |
525 SNDRV_PCM_INFO_MMAP_VALID),
526 .formats = USE_FORMATS,
527 .rates = USE_RATE,
528 .rate_min = USE_RATE_MIN,
529 .rate_max = USE_RATE_MAX,
530 .channels_min = USE_CHANNELS_MIN,
531 .channels_max = USE_CHANNELS_MAX,
532 .buffer_bytes_max = MAX_BUFFER_SIZE,
533 .period_bytes_min = MIN_PERIOD_SIZE,
534 .period_bytes_max = MAX_PERIOD_SIZE,
535 .periods_min = USE_PERIODS_MIN,
536 .periods_max = USE_PERIODS_MAX,
537 .fifo_size = 0,
538 };
539
540 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
541 struct snd_pcm_hw_params *hw_params)
542 {
543 if (fake_buffer) {
544 /* runtime->dma_bytes has to be set manually to allow mmap */
545 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
546 return 0;
547 }
548 return snd_pcm_lib_malloc_pages(substream,
549 params_buffer_bytes(hw_params));
550 }
551
552 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
553 {
554 if (fake_buffer)
555 return 0;
556 return snd_pcm_lib_free_pages(substream);
557 }
558
559 static int dummy_pcm_open(struct snd_pcm_substream *substream)
560 {
561 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
562 struct dummy_model *model = dummy->model;
563 struct snd_pcm_runtime *runtime = substream->runtime;
564 int err;
565
566 dummy->timer_ops = &dummy_systimer_ops;
567 #ifdef CONFIG_HIGH_RES_TIMERS
568 if (hrtimer)
569 dummy->timer_ops = &dummy_hrtimer_ops;
570 #endif
571
572 err = dummy->timer_ops->create(substream);
573 if (err < 0)
574 return err;
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 dummy->timer_ops->free(substream);
597 return err;
598 }
599 return 0;
600 }
601
602 static int dummy_pcm_close(struct snd_pcm_substream *substream)
603 {
604 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
605 dummy->timer_ops->free(substream);
606 return 0;
607 }
608
609 /*
610 * dummy buffer handling
611 */
612
613 static void *dummy_page[2];
614
615 static void free_fake_buffer(void)
616 {
617 if (fake_buffer) {
618 int i;
619 for (i = 0; i < 2; i++)
620 if (dummy_page[i]) {
621 free_page((unsigned long)dummy_page[i]);
622 dummy_page[i] = NULL;
623 }
624 }
625 }
626
627 static int alloc_fake_buffer(void)
628 {
629 int i;
630
631 if (!fake_buffer)
632 return 0;
633 for (i = 0; i < 2; i++) {
634 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
635 if (!dummy_page[i]) {
636 free_fake_buffer();
637 return -ENOMEM;
638 }
639 }
640 return 0;
641 }
642
643 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
644 int channel, snd_pcm_uframes_t pos,
645 void __user *dst, snd_pcm_uframes_t count)
646 {
647 return 0; /* do nothing */
648 }
649
650 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
651 int channel, snd_pcm_uframes_t pos,
652 snd_pcm_uframes_t count)
653 {
654 return 0; /* do nothing */
655 }
656
657 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
658 unsigned long offset)
659 {
660 return virt_to_page(dummy_page[substream->stream]); /* the same page */
661 }
662
663 static struct snd_pcm_ops dummy_pcm_ops = {
664 .open = dummy_pcm_open,
665 .close = dummy_pcm_close,
666 .ioctl = snd_pcm_lib_ioctl,
667 .hw_params = dummy_pcm_hw_params,
668 .hw_free = dummy_pcm_hw_free,
669 .prepare = dummy_pcm_prepare,
670 .trigger = dummy_pcm_trigger,
671 .pointer = dummy_pcm_pointer,
672 };
673
674 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
675 .open = dummy_pcm_open,
676 .close = dummy_pcm_close,
677 .ioctl = snd_pcm_lib_ioctl,
678 .hw_params = dummy_pcm_hw_params,
679 .hw_free = dummy_pcm_hw_free,
680 .prepare = dummy_pcm_prepare,
681 .trigger = dummy_pcm_trigger,
682 .pointer = dummy_pcm_pointer,
683 .copy = dummy_pcm_copy,
684 .silence = dummy_pcm_silence,
685 .page = dummy_pcm_page,
686 };
687
688 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
689 int substreams)
690 {
691 struct snd_pcm *pcm;
692 struct snd_pcm_ops *ops;
693 int err;
694
695 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
696 substreams, substreams, &pcm);
697 if (err < 0)
698 return err;
699 dummy->pcm = pcm;
700 if (fake_buffer)
701 ops = &dummy_pcm_ops_no_buf;
702 else
703 ops = &dummy_pcm_ops;
704 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
705 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
706 pcm->private_data = dummy;
707 pcm->info_flags = 0;
708 strcpy(pcm->name, "Dummy PCM");
709 if (!fake_buffer) {
710 snd_pcm_lib_preallocate_pages_for_all(pcm,
711 SNDRV_DMA_TYPE_CONTINUOUS,
712 snd_dma_continuous_data(GFP_KERNEL),
713 0, 64*1024);
714 }
715 return 0;
716 }
717
718 /*
719 * mixer interface
720 */
721
722 #define DUMMY_VOLUME(xname, xindex, addr) \
723 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
724 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
725 .name = xname, .index = xindex, \
726 .info = snd_dummy_volume_info, \
727 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
728 .private_value = addr, \
729 .tlv = { .p = db_scale_dummy } }
730
731 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
732 struct snd_ctl_elem_info *uinfo)
733 {
734 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
735 uinfo->count = 2;
736 uinfo->value.integer.min = -50;
737 uinfo->value.integer.max = 100;
738 return 0;
739 }
740
741 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
742 struct snd_ctl_elem_value *ucontrol)
743 {
744 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
745 int addr = kcontrol->private_value;
746
747 spin_lock_irq(&dummy->mixer_lock);
748 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
749 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
750 spin_unlock_irq(&dummy->mixer_lock);
751 return 0;
752 }
753
754 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
755 struct snd_ctl_elem_value *ucontrol)
756 {
757 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
758 int change, addr = kcontrol->private_value;
759 int left, right;
760
761 left = ucontrol->value.integer.value[0];
762 if (left < -50)
763 left = -50;
764 if (left > 100)
765 left = 100;
766 right = ucontrol->value.integer.value[1];
767 if (right < -50)
768 right = -50;
769 if (right > 100)
770 right = 100;
771 spin_lock_irq(&dummy->mixer_lock);
772 change = dummy->mixer_volume[addr][0] != left ||
773 dummy->mixer_volume[addr][1] != right;
774 dummy->mixer_volume[addr][0] = left;
775 dummy->mixer_volume[addr][1] = right;
776 spin_unlock_irq(&dummy->mixer_lock);
777 return change;
778 }
779
780 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
781
782 #define DUMMY_CAPSRC(xname, xindex, addr) \
783 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
784 .info = snd_dummy_capsrc_info, \
785 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
786 .private_value = addr }
787
788 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
789
790 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
791 struct snd_ctl_elem_value *ucontrol)
792 {
793 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
794 int addr = kcontrol->private_value;
795
796 spin_lock_irq(&dummy->mixer_lock);
797 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
798 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
799 spin_unlock_irq(&dummy->mixer_lock);
800 return 0;
801 }
802
803 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
804 {
805 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
806 int change, addr = kcontrol->private_value;
807 int left, right;
808
809 left = ucontrol->value.integer.value[0] & 1;
810 right = ucontrol->value.integer.value[1] & 1;
811 spin_lock_irq(&dummy->mixer_lock);
812 change = dummy->capture_source[addr][0] != left &&
813 dummy->capture_source[addr][1] != right;
814 dummy->capture_source[addr][0] = left;
815 dummy->capture_source[addr][1] = right;
816 spin_unlock_irq(&dummy->mixer_lock);
817 return change;
818 }
819
820 static struct snd_kcontrol_new snd_dummy_controls[] = {
821 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
822 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
823 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
824 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
825 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
826 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
827 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
828 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
829 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
830 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
831 };
832
833 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
834 {
835 struct snd_card *card = dummy->card;
836 unsigned int idx;
837 int err;
838
839 spin_lock_init(&dummy->mixer_lock);
840 strcpy(card->mixername, "Dummy Mixer");
841
842 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
843 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
844 if (err < 0)
845 return err;
846 }
847 return 0;
848 }
849
850 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
851 /*
852 * proc interface
853 */
854 static void print_formats(struct snd_dummy *dummy,
855 struct snd_info_buffer *buffer)
856 {
857 int i;
858
859 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
860 if (dummy->pcm_hw.formats & (1ULL << i))
861 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
862 }
863 }
864
865 static void print_rates(struct snd_dummy *dummy,
866 struct snd_info_buffer *buffer)
867 {
868 static int rates[] = {
869 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
870 64000, 88200, 96000, 176400, 192000,
871 };
872 int i;
873
874 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
875 snd_iprintf(buffer, " continuous");
876 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
877 snd_iprintf(buffer, " knot");
878 for (i = 0; i < ARRAY_SIZE(rates); i++)
879 if (dummy->pcm_hw.rates & (1 << i))
880 snd_iprintf(buffer, " %d", rates[i]);
881 }
882
883 #define get_dummy_int_ptr(dummy, ofs) \
884 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
885 #define get_dummy_ll_ptr(dummy, ofs) \
886 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
887
888 struct dummy_hw_field {
889 const char *name;
890 const char *format;
891 unsigned int offset;
892 unsigned int size;
893 };
894 #define FIELD_ENTRY(item, fmt) { \
895 .name = #item, \
896 .format = fmt, \
897 .offset = offsetof(struct snd_pcm_hardware, item), \
898 .size = sizeof(dummy_pcm_hardware.item) }
899
900 static struct dummy_hw_field fields[] = {
901 FIELD_ENTRY(formats, "%#llx"),
902 FIELD_ENTRY(rates, "%#x"),
903 FIELD_ENTRY(rate_min, "%d"),
904 FIELD_ENTRY(rate_max, "%d"),
905 FIELD_ENTRY(channels_min, "%d"),
906 FIELD_ENTRY(channels_max, "%d"),
907 FIELD_ENTRY(buffer_bytes_max, "%ld"),
908 FIELD_ENTRY(period_bytes_min, "%ld"),
909 FIELD_ENTRY(period_bytes_max, "%ld"),
910 FIELD_ENTRY(periods_min, "%d"),
911 FIELD_ENTRY(periods_max, "%d"),
912 };
913
914 static void dummy_proc_read(struct snd_info_entry *entry,
915 struct snd_info_buffer *buffer)
916 {
917 struct snd_dummy *dummy = entry->private_data;
918 int i;
919
920 for (i = 0; i < ARRAY_SIZE(fields); i++) {
921 snd_iprintf(buffer, "%s ", fields[i].name);
922 if (fields[i].size == sizeof(int))
923 snd_iprintf(buffer, fields[i].format,
924 *get_dummy_int_ptr(dummy, fields[i].offset));
925 else
926 snd_iprintf(buffer, fields[i].format,
927 *get_dummy_ll_ptr(dummy, fields[i].offset));
928 if (!strcmp(fields[i].name, "formats"))
929 print_formats(dummy, buffer);
930 else if (!strcmp(fields[i].name, "rates"))
931 print_rates(dummy, buffer);
932 snd_iprintf(buffer, "\n");
933 }
934 }
935
936 static void dummy_proc_write(struct snd_info_entry *entry,
937 struct snd_info_buffer *buffer)
938 {
939 struct snd_dummy *dummy = entry->private_data;
940 char line[64];
941
942 while (!snd_info_get_line(buffer, line, sizeof(line))) {
943 char item[20];
944 const char *ptr;
945 unsigned long long val;
946 int i;
947
948 ptr = snd_info_get_str(item, line, sizeof(item));
949 for (i = 0; i < ARRAY_SIZE(fields); i++) {
950 if (!strcmp(item, fields[i].name))
951 break;
952 }
953 if (i >= ARRAY_SIZE(fields))
954 continue;
955 snd_info_get_str(item, ptr, sizeof(item));
956 if (strict_strtoull(item, 0, &val))
957 continue;
958 if (fields[i].size == sizeof(int))
959 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
960 else
961 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
962 }
963 }
964
965 static void __devinit dummy_proc_init(struct snd_dummy *chip)
966 {
967 struct snd_info_entry *entry;
968
969 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
970 snd_info_set_text_ops(entry, chip, dummy_proc_read);
971 entry->c.text.write = dummy_proc_write;
972 entry->mode |= S_IWUSR;
973 entry->private_data = chip;
974 }
975 }
976 #else
977 #define dummy_proc_init(x)
978 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
979
980 static int __devinit snd_dummy_probe(struct platform_device *devptr)
981 {
982 struct snd_card *card;
983 struct snd_dummy *dummy;
984 struct dummy_model *m = NULL, **mdl;
985 int idx, err;
986 int dev = devptr->id;
987
988 err = snd_card_create(index[dev], id[dev], THIS_MODULE,
989 sizeof(struct snd_dummy), &card);
990 if (err < 0)
991 return err;
992 dummy = card->private_data;
993 dummy->card = card;
994 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
995 if (strcmp(model[dev], (*mdl)->name) == 0) {
996 printk(KERN_INFO
997 "snd-dummy: Using model '%s' for card %i\n",
998 (*mdl)->name, card->number);
999 m = dummy->model = *mdl;
1000 break;
1001 }
1002 }
1003 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1004 if (pcm_substreams[dev] < 1)
1005 pcm_substreams[dev] = 1;
1006 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1007 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1008 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1009 if (err < 0)
1010 goto __nodev;
1011 }
1012
1013 dummy->pcm_hw = dummy_pcm_hardware;
1014 if (m) {
1015 if (m->formats)
1016 dummy->pcm_hw.formats = m->formats;
1017 if (m->buffer_bytes_max)
1018 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1019 if (m->period_bytes_min)
1020 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1021 if (m->period_bytes_max)
1022 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1023 if (m->periods_min)
1024 dummy->pcm_hw.periods_min = m->periods_min;
1025 if (m->periods_max)
1026 dummy->pcm_hw.periods_max = m->periods_max;
1027 if (m->rates)
1028 dummy->pcm_hw.rates = m->rates;
1029 if (m->rate_min)
1030 dummy->pcm_hw.rate_min = m->rate_min;
1031 if (m->rate_max)
1032 dummy->pcm_hw.rate_max = m->rate_max;
1033 if (m->channels_min)
1034 dummy->pcm_hw.channels_min = m->channels_min;
1035 if (m->channels_max)
1036 dummy->pcm_hw.channels_max = m->channels_max;
1037 }
1038
1039 err = snd_card_dummy_new_mixer(dummy);
1040 if (err < 0)
1041 goto __nodev;
1042 strcpy(card->driver, "Dummy");
1043 strcpy(card->shortname, "Dummy");
1044 sprintf(card->longname, "Dummy %i", dev + 1);
1045
1046 dummy_proc_init(dummy);
1047
1048 snd_card_set_dev(card, &devptr->dev);
1049
1050 err = snd_card_register(card);
1051 if (err == 0) {
1052 platform_set_drvdata(devptr, card);
1053 return 0;
1054 }
1055 __nodev:
1056 snd_card_free(card);
1057 return err;
1058 }
1059
1060 static int __devexit snd_dummy_remove(struct platform_device *devptr)
1061 {
1062 snd_card_free(platform_get_drvdata(devptr));
1063 platform_set_drvdata(devptr, NULL);
1064 return 0;
1065 }
1066
1067 #ifdef CONFIG_PM
1068 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
1069 {
1070 struct snd_card *card = platform_get_drvdata(pdev);
1071 struct snd_dummy *dummy = card->private_data;
1072
1073 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1074 snd_pcm_suspend_all(dummy->pcm);
1075 return 0;
1076 }
1077
1078 static int snd_dummy_resume(struct platform_device *pdev)
1079 {
1080 struct snd_card *card = platform_get_drvdata(pdev);
1081
1082 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1083 return 0;
1084 }
1085 #endif
1086
1087 #define SND_DUMMY_DRIVER "snd_dummy"
1088
1089 static struct platform_driver snd_dummy_driver = {
1090 .probe = snd_dummy_probe,
1091 .remove = __devexit_p(snd_dummy_remove),
1092 #ifdef CONFIG_PM
1093 .suspend = snd_dummy_suspend,
1094 .resume = snd_dummy_resume,
1095 #endif
1096 .driver = {
1097 .name = SND_DUMMY_DRIVER
1098 },
1099 };
1100
1101 static void snd_dummy_unregister_all(void)
1102 {
1103 int i;
1104
1105 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1106 platform_device_unregister(devices[i]);
1107 platform_driver_unregister(&snd_dummy_driver);
1108 free_fake_buffer();
1109 }
1110
1111 static int __init alsa_card_dummy_init(void)
1112 {
1113 int i, cards, err;
1114
1115 err = platform_driver_register(&snd_dummy_driver);
1116 if (err < 0)
1117 return err;
1118
1119 err = alloc_fake_buffer();
1120 if (err < 0) {
1121 platform_driver_unregister(&snd_dummy_driver);
1122 return err;
1123 }
1124
1125 cards = 0;
1126 for (i = 0; i < SNDRV_CARDS; i++) {
1127 struct platform_device *device;
1128 if (! enable[i])
1129 continue;
1130 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1131 i, NULL, 0);
1132 if (IS_ERR(device))
1133 continue;
1134 if (!platform_get_drvdata(device)) {
1135 platform_device_unregister(device);
1136 continue;
1137 }
1138 devices[i] = device;
1139 cards++;
1140 }
1141 if (!cards) {
1142 #ifdef MODULE
1143 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1144 #endif
1145 snd_dummy_unregister_all();
1146 return -ENODEV;
1147 }
1148 return 0;
1149 }
1150
1151 static void __exit alsa_card_dummy_exit(void)
1152 {
1153 snd_dummy_unregister_all();
1154 }
1155
1156 module_init(alsa_card_dummy_init)
1157 module_exit(alsa_card_dummy_exit)
Linux with added FPC-III support