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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / sound / drivers / dummy.c
blob252e04ce602f6adf6bf434f0b02edc24c4c8bb76
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/moduleparam.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 #if 0 /* emu10k1 emulation */
49 #define MAX_BUFFER_SIZE (128 * 1024)
50 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
51 {
52 int err;
53 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
54 if (err < 0)
55 return err;
56 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
57 if (err < 0)
58 return err;
59 return 0;
60 }
61 #define add_playback_constraints emu10k1_playback_constraints
62 #endif
63
64 #if 0 /* RME9652 emulation */
65 #define MAX_BUFFER_SIZE (26 * 64 * 1024)
66 #define USE_FORMATS SNDRV_PCM_FMTBIT_S32_LE
67 #define USE_CHANNELS_MIN 26
68 #define USE_CHANNELS_MAX 26
69 #define USE_PERIODS_MIN 2
70 #define USE_PERIODS_MAX 2
71 #endif
72
73 #if 0 /* ICE1712 emulation */
74 #define MAX_BUFFER_SIZE (256 * 1024)
75 #define USE_FORMATS SNDRV_PCM_FMTBIT_S32_LE
76 #define USE_CHANNELS_MIN 10
77 #define USE_CHANNELS_MAX 10
78 #define USE_PERIODS_MIN 1
79 #define USE_PERIODS_MAX 1024
80 #endif
81
82 #if 0 /* UDA1341 emulation */
83 #define MAX_BUFFER_SIZE (16380)
84 #define USE_FORMATS SNDRV_PCM_FMTBIT_S16_LE
85 #define USE_CHANNELS_MIN 2
86 #define USE_CHANNELS_MAX 2
87 #define USE_PERIODS_MIN 2
88 #define USE_PERIODS_MAX 255
89 #endif
90
91 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
92 #define USE_FORMATS SNDRV_PCM_FMTBIT_S16_LE
93 #define USE_CHANNELS_MIN 2
94 #define USE_CHANNELS_MAX 2
95 #define USE_RATE SNDRV_PCM_RATE_48000
96 #define USE_RATE_MIN 48000
97 #define USE_RATE_MAX 48000
98 #endif
99
100 #if 0 /* CA0106 */
101 #define USE_FORMATS SNDRV_PCM_FMTBIT_S16_LE
102 #define USE_CHANNELS_MIN 2
103 #define USE_CHANNELS_MAX 2
104 #define USE_RATE (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000)
105 #define USE_RATE_MIN 48000
106 #define USE_RATE_MAX 192000
107 #define MAX_BUFFER_SIZE ((65536-64)*8)
108 #define MAX_PERIOD_SIZE (65536-64)
109 #define USE_PERIODS_MIN 2
110 #define USE_PERIODS_MAX 8
111 #endif
112
113
114 /* defaults */
115 #ifndef MAX_BUFFER_SIZE
116 #define MAX_BUFFER_SIZE (64*1024)
117 #endif
118 #ifndef MAX_PERIOD_SIZE
119 #define MAX_PERIOD_SIZE MAX_BUFFER_SIZE
120 #endif
121 #ifndef USE_FORMATS
122 #define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
123 #endif
124 #ifndef USE_RATE
125 #define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
126 #define USE_RATE_MIN 5500
127 #define USE_RATE_MAX 48000
128 #endif
129 #ifndef USE_CHANNELS_MIN
130 #define USE_CHANNELS_MIN 1
131 #endif
132 #ifndef USE_CHANNELS_MAX
133 #define USE_CHANNELS_MAX 2
134 #endif
135 #ifndef USE_PERIODS_MIN
136 #define USE_PERIODS_MIN 1
137 #endif
138 #ifndef USE_PERIODS_MAX
139 #define USE_PERIODS_MAX 1024
140 #endif
141 #ifndef add_playback_constraints
142 #define add_playback_constraints(x) 0
143 #endif
144 #ifndef add_capture_constraints
145 #define add_capture_constraints(x) 0
146 #endif
147
148 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
149 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
150 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
151 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
152 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
153 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
154 #ifdef CONFIG_HIGH_RES_TIMERS
155 static int hrtimer = 1;
156 #endif
157 static int fake_buffer = 1;
158
159 module_param_array(index, int, NULL, 0444);
160 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
161 module_param_array(id, charp, NULL, 0444);
162 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
163 module_param_array(enable, bool, NULL, 0444);
164 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
165 module_param_array(pcm_devs, int, NULL, 0444);
166 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
167 module_param_array(pcm_substreams, int, NULL, 0444);
168 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
169 //module_param_array(midi_devs, int, NULL, 0444);
170 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
171 module_param(fake_buffer, bool, 0444);
172 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
173 #ifdef CONFIG_HIGH_RES_TIMERS
174 module_param(hrtimer, bool, 0644);
175 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
176 #endif
177
178 static struct platform_device *devices[SNDRV_CARDS];
179
180 #define MIXER_ADDR_MASTER 0
181 #define MIXER_ADDR_LINE 1
182 #define MIXER_ADDR_MIC 2
183 #define MIXER_ADDR_SYNTH 3
184 #define MIXER_ADDR_CD 4
185 #define MIXER_ADDR_LAST 4
186
187 struct dummy_timer_ops {
188 int (*create)(struct snd_pcm_substream *);
189 void (*free)(struct snd_pcm_substream *);
190 int (*prepare)(struct snd_pcm_substream *);
191 int (*start)(struct snd_pcm_substream *);
192 int (*stop)(struct snd_pcm_substream *);
193 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
194 };
195
196 struct snd_dummy {
197 struct snd_card *card;
198 struct snd_pcm *pcm;
199 spinlock_t mixer_lock;
200 int mixer_volume[MIXER_ADDR_LAST+1][2];
201 int capture_source[MIXER_ADDR_LAST+1][2];
202 const struct dummy_timer_ops *timer_ops;
203 };
204
205 /*
206 * system timer interface
207 */
208
209 struct dummy_systimer_pcm {
210 spinlock_t lock;
211 struct timer_list timer;
212 unsigned long base_time;
213 unsigned int frac_pos; /* fractional sample position (based HZ) */
214 unsigned int frac_period_rest;
215 unsigned int frac_buffer_size; /* buffer_size * HZ */
216 unsigned int frac_period_size; /* period_size * HZ */
217 unsigned int rate;
218 int elapsed;
219 struct snd_pcm_substream *substream;
220 };
221
222 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
223 {
224 dpcm->timer.expires = jiffies +
225 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
226 add_timer(&dpcm->timer);
227 }
228
229 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
230 {
231 unsigned long delta;
232
233 delta = jiffies - dpcm->base_time;
234 if (!delta)
235 return;
236 dpcm->base_time += delta;
237 delta *= dpcm->rate;
238 dpcm->frac_pos += delta;
239 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
240 dpcm->frac_pos -= dpcm->frac_buffer_size;
241 while (dpcm->frac_period_rest <= delta) {
242 dpcm->elapsed++;
243 dpcm->frac_period_rest += dpcm->frac_period_size;
244 }
245 dpcm->frac_period_rest -= delta;
246 }
247
248 static int dummy_systimer_start(struct snd_pcm_substream *substream)
249 {
250 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
251 spin_lock(&dpcm->lock);
252 dpcm->base_time = jiffies;
253 dummy_systimer_rearm(dpcm);
254 spin_unlock(&dpcm->lock);
255 return 0;
256 }
257
258 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
259 {
260 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
261 spin_lock(&dpcm->lock);
262 del_timer(&dpcm->timer);
263 spin_unlock(&dpcm->lock);
264 return 0;
265 }
266
267 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
268 {
269 struct snd_pcm_runtime *runtime = substream->runtime;
270 struct dummy_systimer_pcm *dpcm = runtime->private_data;
271
272 dpcm->frac_pos = 0;
273 dpcm->rate = runtime->rate;
274 dpcm->frac_buffer_size = runtime->buffer_size * HZ;
275 dpcm->frac_period_size = runtime->period_size * HZ;
276 dpcm->frac_period_rest = dpcm->frac_period_size;
277 dpcm->elapsed = 0;
278
279 return 0;
280 }
281
282 static void dummy_systimer_callback(unsigned long data)
283 {
284 struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
285 unsigned long flags;
286 int elapsed = 0;
287
288 spin_lock_irqsave(&dpcm->lock, flags);
289 dummy_systimer_update(dpcm);
290 dummy_systimer_rearm(dpcm);
291 elapsed = dpcm->elapsed;
292 dpcm->elapsed = 0;
293 spin_unlock_irqrestore(&dpcm->lock, flags);
294 if (elapsed)
295 snd_pcm_period_elapsed(dpcm->substream);
296 }
297
298 static snd_pcm_uframes_t
299 dummy_systimer_pointer(struct snd_pcm_substream *substream)
300 {
301 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
302 snd_pcm_uframes_t pos;
303
304 spin_lock(&dpcm->lock);
305 dummy_systimer_update(dpcm);
306 pos = dpcm->frac_pos / HZ;
307 spin_unlock(&dpcm->lock);
308 return pos;
309 }
310
311 static int dummy_systimer_create(struct snd_pcm_substream *substream)
312 {
313 struct dummy_systimer_pcm *dpcm;
314
315 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
316 if (!dpcm)
317 return -ENOMEM;
318 substream->runtime->private_data = dpcm;
319 init_timer(&dpcm->timer);
320 dpcm->timer.data = (unsigned long) dpcm;
321 dpcm->timer.function = dummy_systimer_callback;
322 spin_lock_init(&dpcm->lock);
323 dpcm->substream = substream;
324 return 0;
325 }
326
327 static void dummy_systimer_free(struct snd_pcm_substream *substream)
328 {
329 kfree(substream->runtime->private_data);
330 }
331
332 static struct dummy_timer_ops dummy_systimer_ops = {
333 .create = dummy_systimer_create,
334 .free = dummy_systimer_free,
335 .prepare = dummy_systimer_prepare,
336 .start = dummy_systimer_start,
337 .stop = dummy_systimer_stop,
338 .pointer = dummy_systimer_pointer,
339 };
340
341 #ifdef CONFIG_HIGH_RES_TIMERS
342 /*
343 * hrtimer interface
344 */
345
346 struct dummy_hrtimer_pcm {
347 ktime_t base_time;
348 ktime_t period_time;
349 atomic_t running;
350 struct hrtimer timer;
351 struct tasklet_struct tasklet;
352 struct snd_pcm_substream *substream;
353 };
354
355 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
356 {
357 struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
358 if (atomic_read(&dpcm->running))
359 snd_pcm_period_elapsed(dpcm->substream);
360 }
361
362 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
363 {
364 struct dummy_hrtimer_pcm *dpcm;
365
366 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
367 if (!atomic_read(&dpcm->running))
368 return HRTIMER_NORESTART;
369 tasklet_schedule(&dpcm->tasklet);
370 hrtimer_forward_now(timer, dpcm->period_time);
371 return HRTIMER_RESTART;
372 }
373
374 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
375 {
376 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
377
378 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
379 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
380 atomic_set(&dpcm->running, 1);
381 return 0;
382 }
383
384 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
385 {
386 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
387
388 atomic_set(&dpcm->running, 0);
389 hrtimer_cancel(&dpcm->timer);
390 return 0;
391 }
392
393 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
394 {
395 tasklet_kill(&dpcm->tasklet);
396 }
397
398 static snd_pcm_uframes_t
399 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
400 {
401 struct snd_pcm_runtime *runtime = substream->runtime;
402 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
403 u64 delta;
404 u32 pos;
405
406 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
407 dpcm->base_time);
408 delta = div_u64(delta * runtime->rate + 999999, 1000000);
409 div_u64_rem(delta, runtime->buffer_size, &pos);
410 return pos;
411 }
412
413 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
414 {
415 struct snd_pcm_runtime *runtime = substream->runtime;
416 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
417 unsigned int period, rate;
418 long sec;
419 unsigned long nsecs;
420
421 dummy_hrtimer_sync(dpcm);
422 period = runtime->period_size;
423 rate = runtime->rate;
424 sec = period / rate;
425 period %= rate;
426 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
427 dpcm->period_time = ktime_set(sec, nsecs);
428
429 return 0;
430 }
431
432 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
433 {
434 struct dummy_hrtimer_pcm *dpcm;
435
436 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
437 if (!dpcm)
438 return -ENOMEM;
439 substream->runtime->private_data = dpcm;
440 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
441 dpcm->timer.function = dummy_hrtimer_callback;
442 dpcm->substream = substream;
443 atomic_set(&dpcm->running, 0);
444 tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
445 (unsigned long)dpcm);
446 return 0;
447 }
448
449 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
450 {
451 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
452 dummy_hrtimer_sync(dpcm);
453 kfree(dpcm);
454 }
455
456 static struct dummy_timer_ops dummy_hrtimer_ops = {
457 .create = dummy_hrtimer_create,
458 .free = dummy_hrtimer_free,
459 .prepare = dummy_hrtimer_prepare,
460 .start = dummy_hrtimer_start,
461 .stop = dummy_hrtimer_stop,
462 .pointer = dummy_hrtimer_pointer,
463 };
464
465 #endif /* CONFIG_HIGH_RES_TIMERS */
466
467 /*
468 * PCM interface
469 */
470
471 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
472 {
473 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
474
475 switch (cmd) {
476 case SNDRV_PCM_TRIGGER_START:
477 case SNDRV_PCM_TRIGGER_RESUME:
478 return dummy->timer_ops->start(substream);
479 case SNDRV_PCM_TRIGGER_STOP:
480 case SNDRV_PCM_TRIGGER_SUSPEND:
481 return dummy->timer_ops->stop(substream);
482 }
483 return -EINVAL;
484 }
485
486 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
487 {
488 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
489
490 return dummy->timer_ops->prepare(substream);
491 }
492
493 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
494 {
495 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
496
497 return dummy->timer_ops->pointer(substream);
498 }
499
500 static struct snd_pcm_hardware dummy_pcm_hardware = {
501 .info = (SNDRV_PCM_INFO_MMAP |
502 SNDRV_PCM_INFO_INTERLEAVED |
503 SNDRV_PCM_INFO_RESUME |
504 SNDRV_PCM_INFO_MMAP_VALID),
505 .formats = USE_FORMATS,
506 .rates = USE_RATE,
507 .rate_min = USE_RATE_MIN,
508 .rate_max = USE_RATE_MAX,
509 .channels_min = USE_CHANNELS_MIN,
510 .channels_max = USE_CHANNELS_MAX,
511 .buffer_bytes_max = MAX_BUFFER_SIZE,
512 .period_bytes_min = 64,
513 .period_bytes_max = MAX_PERIOD_SIZE,
514 .periods_min = USE_PERIODS_MIN,
515 .periods_max = USE_PERIODS_MAX,
516 .fifo_size = 0,
517 };
518
519 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
520 struct snd_pcm_hw_params *hw_params)
521 {
522 if (fake_buffer) {
523 /* runtime->dma_bytes has to be set manually to allow mmap */
524 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
525 return 0;
526 }
527 return snd_pcm_lib_malloc_pages(substream,
528 params_buffer_bytes(hw_params));
529 }
530
531 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
532 {
533 if (fake_buffer)
534 return 0;
535 return snd_pcm_lib_free_pages(substream);
536 }
537
538 static int dummy_pcm_open(struct snd_pcm_substream *substream)
539 {
540 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
541 struct snd_pcm_runtime *runtime = substream->runtime;
542 int err;
543
544 dummy->timer_ops = &dummy_systimer_ops;
545 #ifdef CONFIG_HIGH_RES_TIMERS
546 if (hrtimer)
547 dummy->timer_ops = &dummy_hrtimer_ops;
548 #endif
549
550 err = dummy->timer_ops->create(substream);
551 if (err < 0)
552 return err;
553
554 runtime->hw = dummy_pcm_hardware;
555 if (substream->pcm->device & 1) {
556 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
557 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
558 }
559 if (substream->pcm->device & 2)
560 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
561 SNDRV_PCM_INFO_MMAP_VALID);
562
563 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
564 err = add_playback_constraints(substream->runtime);
565 else
566 err = add_capture_constraints(substream->runtime);
567 if (err < 0) {
568 dummy->timer_ops->free(substream);
569 return err;
570 }
571 return 0;
572 }
573
574 static int dummy_pcm_close(struct snd_pcm_substream *substream)
575 {
576 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
577 dummy->timer_ops->free(substream);
578 return 0;
579 }
580
581 /*
582 * dummy buffer handling
583 */
584
585 static void *dummy_page[2];
586
587 static void free_fake_buffer(void)
588 {
589 if (fake_buffer) {
590 int i;
591 for (i = 0; i < 2; i++)
592 if (dummy_page[i]) {
593 free_page((unsigned long)dummy_page[i]);
594 dummy_page[i] = NULL;
595 }
596 }
597 }
598
599 static int alloc_fake_buffer(void)
600 {
601 int i;
602
603 if (!fake_buffer)
604 return 0;
605 for (i = 0; i < 2; i++) {
606 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
607 if (!dummy_page[i]) {
608 free_fake_buffer();
609 return -ENOMEM;
610 }
611 }
612 return 0;
613 }
614
615 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
616 int channel, snd_pcm_uframes_t pos,
617 void __user *dst, snd_pcm_uframes_t count)
618 {
619 return 0; /* do nothing */
620 }
621
622 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
623 int channel, snd_pcm_uframes_t pos,
624 snd_pcm_uframes_t count)
625 {
626 return 0; /* do nothing */
627 }
628
629 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
630 unsigned long offset)
631 {
632 return virt_to_page(dummy_page[substream->stream]); /* the same page */
633 }
634
635 static struct snd_pcm_ops dummy_pcm_ops = {
636 .open = dummy_pcm_open,
637 .close = dummy_pcm_close,
638 .ioctl = snd_pcm_lib_ioctl,
639 .hw_params = dummy_pcm_hw_params,
640 .hw_free = dummy_pcm_hw_free,
641 .prepare = dummy_pcm_prepare,
642 .trigger = dummy_pcm_trigger,
643 .pointer = dummy_pcm_pointer,
644 };
645
646 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
647 .open = dummy_pcm_open,
648 .close = dummy_pcm_close,
649 .ioctl = snd_pcm_lib_ioctl,
650 .hw_params = dummy_pcm_hw_params,
651 .hw_free = dummy_pcm_hw_free,
652 .prepare = dummy_pcm_prepare,
653 .trigger = dummy_pcm_trigger,
654 .pointer = dummy_pcm_pointer,
655 .copy = dummy_pcm_copy,
656 .silence = dummy_pcm_silence,
657 .page = dummy_pcm_page,
658 };
659
660 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
661 int substreams)
662 {
663 struct snd_pcm *pcm;
664 struct snd_pcm_ops *ops;
665 int err;
666
667 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
668 substreams, substreams, &pcm);
669 if (err < 0)
670 return err;
671 dummy->pcm = pcm;
672 if (fake_buffer)
673 ops = &dummy_pcm_ops_no_buf;
674 else
675 ops = &dummy_pcm_ops;
676 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
677 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
678 pcm->private_data = dummy;
679 pcm->info_flags = 0;
680 strcpy(pcm->name, "Dummy PCM");
681 if (!fake_buffer) {
682 snd_pcm_lib_preallocate_pages_for_all(pcm,
683 SNDRV_DMA_TYPE_CONTINUOUS,
684 snd_dma_continuous_data(GFP_KERNEL),
685 0, 64*1024);
686 }
687 return 0;
688 }
689
690 /*
691 * mixer interface
692 */
693
694 #define DUMMY_VOLUME(xname, xindex, addr) \
695 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
696 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
697 .name = xname, .index = xindex, \
698 .info = snd_dummy_volume_info, \
699 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
700 .private_value = addr, \
701 .tlv = { .p = db_scale_dummy } }
702
703 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
704 struct snd_ctl_elem_info *uinfo)
705 {
706 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
707 uinfo->count = 2;
708 uinfo->value.integer.min = -50;
709 uinfo->value.integer.max = 100;
710 return 0;
711 }
712
713 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
714 struct snd_ctl_elem_value *ucontrol)
715 {
716 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
717 int addr = kcontrol->private_value;
718
719 spin_lock_irq(&dummy->mixer_lock);
720 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
721 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
722 spin_unlock_irq(&dummy->mixer_lock);
723 return 0;
724 }
725
726 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
727 struct snd_ctl_elem_value *ucontrol)
728 {
729 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
730 int change, addr = kcontrol->private_value;
731 int left, right;
732
733 left = ucontrol->value.integer.value[0];
734 if (left < -50)
735 left = -50;
736 if (left > 100)
737 left = 100;
738 right = ucontrol->value.integer.value[1];
739 if (right < -50)
740 right = -50;
741 if (right > 100)
742 right = 100;
743 spin_lock_irq(&dummy->mixer_lock);
744 change = dummy->mixer_volume[addr][0] != left ||
745 dummy->mixer_volume[addr][1] != right;
746 dummy->mixer_volume[addr][0] = left;
747 dummy->mixer_volume[addr][1] = right;
748 spin_unlock_irq(&dummy->mixer_lock);
749 return change;
750 }
751
752 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
753
754 #define DUMMY_CAPSRC(xname, xindex, addr) \
755 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
756 .info = snd_dummy_capsrc_info, \
757 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
758 .private_value = addr }
759
760 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
761
762 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
763 struct snd_ctl_elem_value *ucontrol)
764 {
765 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
766 int addr = kcontrol->private_value;
767
768 spin_lock_irq(&dummy->mixer_lock);
769 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
770 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
771 spin_unlock_irq(&dummy->mixer_lock);
772 return 0;
773 }
774
775 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
776 {
777 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
778 int change, addr = kcontrol->private_value;
779 int left, right;
780
781 left = ucontrol->value.integer.value[0] & 1;
782 right = ucontrol->value.integer.value[1] & 1;
783 spin_lock_irq(&dummy->mixer_lock);
784 change = dummy->capture_source[addr][0] != left &&
785 dummy->capture_source[addr][1] != right;
786 dummy->capture_source[addr][0] = left;
787 dummy->capture_source[addr][1] = right;
788 spin_unlock_irq(&dummy->mixer_lock);
789 return change;
790 }
791
792 static struct snd_kcontrol_new snd_dummy_controls[] = {
793 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
794 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
795 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
796 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
797 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
798 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
799 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
800 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
801 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
802 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
803 };
804
805 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
806 {
807 struct snd_card *card = dummy->card;
808 unsigned int idx;
809 int err;
810
811 spin_lock_init(&dummy->mixer_lock);
812 strcpy(card->mixername, "Dummy Mixer");
813
814 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
815 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
816 if (err < 0)
817 return err;
818 }
819 return 0;
820 }
821
822 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
823 /*
824 * proc interface
825 */
826 static void print_formats(struct snd_info_buffer *buffer)
827 {
828 int i;
829
830 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
831 if (dummy_pcm_hardware.formats & (1ULL << i))
832 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
833 }
834 }
835
836 static void print_rates(struct snd_info_buffer *buffer)
837 {
838 static int rates[] = {
839 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
840 64000, 88200, 96000, 176400, 192000,
841 };
842 int i;
843
844 if (dummy_pcm_hardware.rates & SNDRV_PCM_RATE_CONTINUOUS)
845 snd_iprintf(buffer, " continuous");
846 if (dummy_pcm_hardware.rates & SNDRV_PCM_RATE_KNOT)
847 snd_iprintf(buffer, " knot");
848 for (i = 0; i < ARRAY_SIZE(rates); i++)
849 if (dummy_pcm_hardware.rates & (1 << i))
850 snd_iprintf(buffer, " %d", rates[i]);
851 }
852
853 #define get_dummy_int_ptr(ofs) \
854 (unsigned int *)((char *)&dummy_pcm_hardware + (ofs))
855 #define get_dummy_ll_ptr(ofs) \
856 (unsigned long long *)((char *)&dummy_pcm_hardware + (ofs))
857
858 struct dummy_hw_field {
859 const char *name;
860 const char *format;
861 unsigned int offset;
862 unsigned int size;
863 };
864 #define FIELD_ENTRY(item, fmt) { \
865 .name = #item, \
866 .format = fmt, \
867 .offset = offsetof(struct snd_pcm_hardware, item), \
868 .size = sizeof(dummy_pcm_hardware.item) }
869
870 static struct dummy_hw_field fields[] = {
871 FIELD_ENTRY(formats, "%#llx"),
872 FIELD_ENTRY(rates, "%#x"),
873 FIELD_ENTRY(rate_min, "%d"),
874 FIELD_ENTRY(rate_max, "%d"),
875 FIELD_ENTRY(channels_min, "%d"),
876 FIELD_ENTRY(channels_max, "%d"),
877 FIELD_ENTRY(buffer_bytes_max, "%ld"),
878 FIELD_ENTRY(period_bytes_min, "%ld"),
879 FIELD_ENTRY(period_bytes_max, "%ld"),
880 FIELD_ENTRY(periods_min, "%d"),
881 FIELD_ENTRY(periods_max, "%d"),
882 };
883
884 static void dummy_proc_read(struct snd_info_entry *entry,
885 struct snd_info_buffer *buffer)
886 {
887 int i;
888
889 for (i = 0; i < ARRAY_SIZE(fields); i++) {
890 snd_iprintf(buffer, "%s ", fields[i].name);
891 if (fields[i].size == sizeof(int))
892 snd_iprintf(buffer, fields[i].format,
893 *get_dummy_int_ptr(fields[i].offset));
894 else
895 snd_iprintf(buffer, fields[i].format,
896 *get_dummy_ll_ptr(fields[i].offset));
897 if (!strcmp(fields[i].name, "formats"))
898 print_formats(buffer);
899 else if (!strcmp(fields[i].name, "rates"))
900 print_rates(buffer);
901 snd_iprintf(buffer, "\n");
902 }
903 }
904
905 static void dummy_proc_write(struct snd_info_entry *entry,
906 struct snd_info_buffer *buffer)
907 {
908 char line[64];
909
910 while (!snd_info_get_line(buffer, line, sizeof(line))) {
911 char item[20];
912 const char *ptr;
913 unsigned long long val;
914 int i;
915
916 ptr = snd_info_get_str(item, line, sizeof(item));
917 for (i = 0; i < ARRAY_SIZE(fields); i++) {
918 if (!strcmp(item, fields[i].name))
919 break;
920 }
921 if (i >= ARRAY_SIZE(fields))
922 continue;
923 snd_info_get_str(item, ptr, sizeof(item));
924 if (strict_strtoull(item, 0, &val))
925 continue;
926 if (fields[i].size == sizeof(int))
927 *get_dummy_int_ptr(fields[i].offset) = val;
928 else
929 *get_dummy_ll_ptr(fields[i].offset) = val;
930 }
931 }
932
933 static void __devinit dummy_proc_init(struct snd_dummy *chip)
934 {
935 struct snd_info_entry *entry;
936
937 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
938 snd_info_set_text_ops(entry, chip, dummy_proc_read);
939 entry->c.text.write = dummy_proc_write;
940 entry->mode |= S_IWUSR;
941 }
942 }
943 #else
944 #define dummy_proc_init(x)
945 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
946
947 static int __devinit snd_dummy_probe(struct platform_device *devptr)
948 {
949 struct snd_card *card;
950 struct snd_dummy *dummy;
951 int idx, err;
952 int dev = devptr->id;
953
954 err = snd_card_create(index[dev], id[dev], THIS_MODULE,
955 sizeof(struct snd_dummy), &card);
956 if (err < 0)
957 return err;
958 dummy = card->private_data;
959 dummy->card = card;
960 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
961 if (pcm_substreams[dev] < 1)
962 pcm_substreams[dev] = 1;
963 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
964 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
965 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
966 if (err < 0)
967 goto __nodev;
968 }
969 err = snd_card_dummy_new_mixer(dummy);
970 if (err < 0)
971 goto __nodev;
972 strcpy(card->driver, "Dummy");
973 strcpy(card->shortname, "Dummy");
974 sprintf(card->longname, "Dummy %i", dev + 1);
975
976 dummy_proc_init(dummy);
977
978 snd_card_set_dev(card, &devptr->dev);
979
980 err = snd_card_register(card);
981 if (err == 0) {
982 platform_set_drvdata(devptr, card);
983 return 0;
984 }
985 __nodev:
986 snd_card_free(card);
987 return err;
988 }
989
990 static int __devexit snd_dummy_remove(struct platform_device *devptr)
991 {
992 snd_card_free(platform_get_drvdata(devptr));
993 platform_set_drvdata(devptr, NULL);
994 return 0;
995 }
996
997 #ifdef CONFIG_PM
998 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
999 {
1000 struct snd_card *card = platform_get_drvdata(pdev);
1001 struct snd_dummy *dummy = card->private_data;
1002
1003 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1004 snd_pcm_suspend_all(dummy->pcm);
1005 return 0;
1006 }
1007
1008 static int snd_dummy_resume(struct platform_device *pdev)
1009 {
1010 struct snd_card *card = platform_get_drvdata(pdev);
1011
1012 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1013 return 0;
1014 }
1015 #endif
1016
1017 #define SND_DUMMY_DRIVER "snd_dummy"
1018
1019 static struct platform_driver snd_dummy_driver = {
1020 .probe = snd_dummy_probe,
1021 .remove = __devexit_p(snd_dummy_remove),
1022 #ifdef CONFIG_PM
1023 .suspend = snd_dummy_suspend,
1024 .resume = snd_dummy_resume,
1025 #endif
1026 .driver = {
1027 .name = SND_DUMMY_DRIVER
1028 },
1029 };
1030
1031 static void snd_dummy_unregister_all(void)
1032 {
1033 int i;
1034
1035 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1036 platform_device_unregister(devices[i]);
1037 platform_driver_unregister(&snd_dummy_driver);
1038 free_fake_buffer();
1039 }
1040
1041 static int __init alsa_card_dummy_init(void)
1042 {
1043 int i, cards, err;
1044
1045 err = platform_driver_register(&snd_dummy_driver);
1046 if (err < 0)
1047 return err;
1048
1049 err = alloc_fake_buffer();
1050 if (err < 0) {
1051 platform_driver_unregister(&snd_dummy_driver);
1052 return err;
1053 }
1054
1055 cards = 0;
1056 for (i = 0; i < SNDRV_CARDS; i++) {
1057 struct platform_device *device;
1058 if (! enable[i])
1059 continue;
1060 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1061 i, NULL, 0);
1062 if (IS_ERR(device))
1063 continue;
1064 if (!platform_get_drvdata(device)) {
1065 platform_device_unregister(device);
1066 continue;
1067 }
1068 devices[i] = device;
1069 cards++;
1070 }
1071 if (!cards) {
1072 #ifdef MODULE
1073 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1074 #endif
1075 snd_dummy_unregister_all();
1076 return -ENODEV;
1077 }
1078 return 0;
1079 }
1080
1081 static void __exit alsa_card_dummy_exit(void)
1082 {
1083 snd_dummy_unregister_all();
1084 }
1085
1086 module_init(alsa_card_dummy_init)
1087 module_exit(alsa_card_dummy_exit)
Linux with added FPC-III support