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documentation: RCU grace-period memory ordering guarantees
[linux/fpc-iii.git] / sound / drivers / dummy.c
blobc0939a0164a6ff4c378ffe0863e5b7e265cf46c4
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(unsigned long data)
310 {
311 struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
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 setup_timer(&dpcm->timer, dummy_systimer_callback,
347 (unsigned long) dpcm);
348 spin_lock_init(&dpcm->lock);
349 dpcm->substream = substream;
350 return 0;
351 }
352
353 static void dummy_systimer_free(struct snd_pcm_substream *substream)
354 {
355 kfree(substream->runtime->private_data);
356 }
357
358 static const struct dummy_timer_ops dummy_systimer_ops = {
359 .create = dummy_systimer_create,
360 .free = dummy_systimer_free,
361 .prepare = dummy_systimer_prepare,
362 .start = dummy_systimer_start,
363 .stop = dummy_systimer_stop,
364 .pointer = dummy_systimer_pointer,
365 };
366
367 #ifdef CONFIG_HIGH_RES_TIMERS
368 /*
369 * hrtimer interface
370 */
371
372 struct dummy_hrtimer_pcm {
373 /* ops must be the first item */
374 const struct dummy_timer_ops *timer_ops;
375 ktime_t base_time;
376 ktime_t period_time;
377 atomic_t running;
378 struct hrtimer timer;
379 struct tasklet_struct tasklet;
380 struct snd_pcm_substream *substream;
381 };
382
383 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
384 {
385 struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
386 if (atomic_read(&dpcm->running))
387 snd_pcm_period_elapsed(dpcm->substream);
388 }
389
390 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
391 {
392 struct dummy_hrtimer_pcm *dpcm;
393
394 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
395 if (!atomic_read(&dpcm->running))
396 return HRTIMER_NORESTART;
397 tasklet_schedule(&dpcm->tasklet);
398 hrtimer_forward_now(timer, dpcm->period_time);
399 return HRTIMER_RESTART;
400 }
401
402 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
403 {
404 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
405
406 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
407 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
408 atomic_set(&dpcm->running, 1);
409 return 0;
410 }
411
412 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
413 {
414 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
415
416 atomic_set(&dpcm->running, 0);
417 hrtimer_cancel(&dpcm->timer);
418 return 0;
419 }
420
421 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
422 {
423 hrtimer_cancel(&dpcm->timer);
424 tasklet_kill(&dpcm->tasklet);
425 }
426
427 static snd_pcm_uframes_t
428 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
429 {
430 struct snd_pcm_runtime *runtime = substream->runtime;
431 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
432 u64 delta;
433 u32 pos;
434
435 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
436 dpcm->base_time);
437 delta = div_u64(delta * runtime->rate + 999999, 1000000);
438 div_u64_rem(delta, runtime->buffer_size, &pos);
439 return pos;
440 }
441
442 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
443 {
444 struct snd_pcm_runtime *runtime = substream->runtime;
445 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
446 unsigned int period, rate;
447 long sec;
448 unsigned long nsecs;
449
450 dummy_hrtimer_sync(dpcm);
451 period = runtime->period_size;
452 rate = runtime->rate;
453 sec = period / rate;
454 period %= rate;
455 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
456 dpcm->period_time = ktime_set(sec, nsecs);
457
458 return 0;
459 }
460
461 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
462 {
463 struct dummy_hrtimer_pcm *dpcm;
464
465 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
466 if (!dpcm)
467 return -ENOMEM;
468 substream->runtime->private_data = dpcm;
469 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
470 dpcm->timer.function = dummy_hrtimer_callback;
471 dpcm->substream = substream;
472 atomic_set(&dpcm->running, 0);
473 tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
474 (unsigned long)dpcm);
475 return 0;
476 }
477
478 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
479 {
480 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
481 dummy_hrtimer_sync(dpcm);
482 kfree(dpcm);
483 }
484
485 static const struct dummy_timer_ops dummy_hrtimer_ops = {
486 .create = dummy_hrtimer_create,
487 .free = dummy_hrtimer_free,
488 .prepare = dummy_hrtimer_prepare,
489 .start = dummy_hrtimer_start,
490 .stop = dummy_hrtimer_stop,
491 .pointer = dummy_hrtimer_pointer,
492 };
493
494 #endif /* CONFIG_HIGH_RES_TIMERS */
495
496 /*
497 * PCM interface
498 */
499
500 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
501 {
502 switch (cmd) {
503 case SNDRV_PCM_TRIGGER_START:
504 case SNDRV_PCM_TRIGGER_RESUME:
505 return get_dummy_ops(substream)->start(substream);
506 case SNDRV_PCM_TRIGGER_STOP:
507 case SNDRV_PCM_TRIGGER_SUSPEND:
508 return get_dummy_ops(substream)->stop(substream);
509 }
510 return -EINVAL;
511 }
512
513 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
514 {
515 return get_dummy_ops(substream)->prepare(substream);
516 }
517
518 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
519 {
520 return get_dummy_ops(substream)->pointer(substream);
521 }
522
523 static const struct snd_pcm_hardware dummy_pcm_hardware = {
524 .info = (SNDRV_PCM_INFO_MMAP |
525 SNDRV_PCM_INFO_INTERLEAVED |
526 SNDRV_PCM_INFO_RESUME |
527 SNDRV_PCM_INFO_MMAP_VALID),
528 .formats = USE_FORMATS,
529 .rates = USE_RATE,
530 .rate_min = USE_RATE_MIN,
531 .rate_max = USE_RATE_MAX,
532 .channels_min = USE_CHANNELS_MIN,
533 .channels_max = USE_CHANNELS_MAX,
534 .buffer_bytes_max = MAX_BUFFER_SIZE,
535 .period_bytes_min = MIN_PERIOD_SIZE,
536 .period_bytes_max = MAX_PERIOD_SIZE,
537 .periods_min = USE_PERIODS_MIN,
538 .periods_max = USE_PERIODS_MAX,
539 .fifo_size = 0,
540 };
541
542 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
543 struct snd_pcm_hw_params *hw_params)
544 {
545 if (fake_buffer) {
546 /* runtime->dma_bytes has to be set manually to allow mmap */
547 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
548 return 0;
549 }
550 return snd_pcm_lib_malloc_pages(substream,
551 params_buffer_bytes(hw_params));
552 }
553
554 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
555 {
556 if (fake_buffer)
557 return 0;
558 return snd_pcm_lib_free_pages(substream);
559 }
560
561 static int dummy_pcm_open(struct snd_pcm_substream *substream)
562 {
563 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
564 struct dummy_model *model = dummy->model;
565 struct snd_pcm_runtime *runtime = substream->runtime;
566 const struct dummy_timer_ops *ops;
567 int err;
568
569 ops = &dummy_systimer_ops;
570 #ifdef CONFIG_HIGH_RES_TIMERS
571 if (hrtimer)
572 ops = &dummy_hrtimer_ops;
573 #endif
574
575 err = ops->create(substream);
576 if (err < 0)
577 return err;
578 get_dummy_ops(substream) = ops;
579
580 runtime->hw = dummy->pcm_hw;
581 if (substream->pcm->device & 1) {
582 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
583 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
584 }
585 if (substream->pcm->device & 2)
586 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
587 SNDRV_PCM_INFO_MMAP_VALID);
588
589 if (model == NULL)
590 return 0;
591
592 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
593 if (model->playback_constraints)
594 err = model->playback_constraints(substream->runtime);
595 } else {
596 if (model->capture_constraints)
597 err = model->capture_constraints(substream->runtime);
598 }
599 if (err < 0) {
600 get_dummy_ops(substream)->free(substream);
601 return err;
602 }
603 return 0;
604 }
605
606 static int dummy_pcm_close(struct snd_pcm_substream *substream)
607 {
608 get_dummy_ops(substream)->free(substream);
609 return 0;
610 }
611
612 /*
613 * dummy buffer handling
614 */
615
616 static void *dummy_page[2];
617
618 static void free_fake_buffer(void)
619 {
620 if (fake_buffer) {
621 int i;
622 for (i = 0; i < 2; i++)
623 if (dummy_page[i]) {
624 free_page((unsigned long)dummy_page[i]);
625 dummy_page[i] = NULL;
626 }
627 }
628 }
629
630 static int alloc_fake_buffer(void)
631 {
632 int i;
633
634 if (!fake_buffer)
635 return 0;
636 for (i = 0; i < 2; i++) {
637 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
638 if (!dummy_page[i]) {
639 free_fake_buffer();
640 return -ENOMEM;
641 }
642 }
643 return 0;
644 }
645
646 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
647 int channel, unsigned long pos,
648 void __user *dst, unsigned long bytes)
649 {
650 return 0; /* do nothing */
651 }
652
653 static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
654 int channel, unsigned long pos,
655 void *dst, unsigned long bytes)
656 {
657 return 0; /* do nothing */
658 }
659
660 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
661 int channel, unsigned long pos,
662 unsigned long bytes)
663 {
664 return 0; /* do nothing */
665 }
666
667 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
668 unsigned long offset)
669 {
670 return virt_to_page(dummy_page[substream->stream]); /* the same page */
671 }
672
673 static struct snd_pcm_ops dummy_pcm_ops = {
674 .open = dummy_pcm_open,
675 .close = dummy_pcm_close,
676 .ioctl = snd_pcm_lib_ioctl,
677 .hw_params = dummy_pcm_hw_params,
678 .hw_free = dummy_pcm_hw_free,
679 .prepare = dummy_pcm_prepare,
680 .trigger = dummy_pcm_trigger,
681 .pointer = dummy_pcm_pointer,
682 };
683
684 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
685 .open = dummy_pcm_open,
686 .close = dummy_pcm_close,
687 .ioctl = snd_pcm_lib_ioctl,
688 .hw_params = dummy_pcm_hw_params,
689 .hw_free = dummy_pcm_hw_free,
690 .prepare = dummy_pcm_prepare,
691 .trigger = dummy_pcm_trigger,
692 .pointer = dummy_pcm_pointer,
693 .copy_user = dummy_pcm_copy,
694 .copy_kernel = dummy_pcm_copy_kernel,
695 .fill_silence = dummy_pcm_silence,
696 .page = dummy_pcm_page,
697 };
698
699 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
700 int substreams)
701 {
702 struct snd_pcm *pcm;
703 struct snd_pcm_ops *ops;
704 int err;
705
706 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
707 substreams, substreams, &pcm);
708 if (err < 0)
709 return err;
710 dummy->pcm = pcm;
711 if (fake_buffer)
712 ops = &dummy_pcm_ops_no_buf;
713 else
714 ops = &dummy_pcm_ops;
715 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
716 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
717 pcm->private_data = dummy;
718 pcm->info_flags = 0;
719 strcpy(pcm->name, "Dummy PCM");
720 if (!fake_buffer) {
721 snd_pcm_lib_preallocate_pages_for_all(pcm,
722 SNDRV_DMA_TYPE_CONTINUOUS,
723 snd_dma_continuous_data(GFP_KERNEL),
724 0, 64*1024);
725 }
726 return 0;
727 }
728
729 /*
730 * mixer interface
731 */
732
733 #define DUMMY_VOLUME(xname, xindex, addr) \
734 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
735 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
736 .name = xname, .index = xindex, \
737 .info = snd_dummy_volume_info, \
738 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
739 .private_value = addr, \
740 .tlv = { .p = db_scale_dummy } }
741
742 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
743 struct snd_ctl_elem_info *uinfo)
744 {
745 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
746 uinfo->count = 2;
747 uinfo->value.integer.min = -50;
748 uinfo->value.integer.max = 100;
749 return 0;
750 }
751
752 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
753 struct snd_ctl_elem_value *ucontrol)
754 {
755 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
756 int addr = kcontrol->private_value;
757
758 spin_lock_irq(&dummy->mixer_lock);
759 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
760 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
761 spin_unlock_irq(&dummy->mixer_lock);
762 return 0;
763 }
764
765 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
766 struct snd_ctl_elem_value *ucontrol)
767 {
768 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
769 int change, addr = kcontrol->private_value;
770 int left, right;
771
772 left = ucontrol->value.integer.value[0];
773 if (left < -50)
774 left = -50;
775 if (left > 100)
776 left = 100;
777 right = ucontrol->value.integer.value[1];
778 if (right < -50)
779 right = -50;
780 if (right > 100)
781 right = 100;
782 spin_lock_irq(&dummy->mixer_lock);
783 change = dummy->mixer_volume[addr][0] != left ||
784 dummy->mixer_volume[addr][1] != right;
785 dummy->mixer_volume[addr][0] = left;
786 dummy->mixer_volume[addr][1] = right;
787 spin_unlock_irq(&dummy->mixer_lock);
788 return change;
789 }
790
791 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
792
793 #define DUMMY_CAPSRC(xname, xindex, addr) \
794 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
795 .info = snd_dummy_capsrc_info, \
796 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
797 .private_value = addr }
798
799 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
800
801 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
802 struct snd_ctl_elem_value *ucontrol)
803 {
804 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
805 int addr = kcontrol->private_value;
806
807 spin_lock_irq(&dummy->mixer_lock);
808 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
809 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
810 spin_unlock_irq(&dummy->mixer_lock);
811 return 0;
812 }
813
814 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
815 {
816 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
817 int change, addr = kcontrol->private_value;
818 int left, right;
819
820 left = ucontrol->value.integer.value[0] & 1;
821 right = ucontrol->value.integer.value[1] & 1;
822 spin_lock_irq(&dummy->mixer_lock);
823 change = dummy->capture_source[addr][0] != left &&
824 dummy->capture_source[addr][1] != right;
825 dummy->capture_source[addr][0] = left;
826 dummy->capture_source[addr][1] = right;
827 spin_unlock_irq(&dummy->mixer_lock);
828 return change;
829 }
830
831 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
832 struct snd_ctl_elem_info *info)
833 {
834 const char *const names[] = { "None", "CD Player" };
835
836 return snd_ctl_enum_info(info, 1, 2, names);
837 }
838
839 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
840 struct snd_ctl_elem_value *value)
841 {
842 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
843
844 value->value.enumerated.item[0] = dummy->iobox;
845 return 0;
846 }
847
848 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
849 struct snd_ctl_elem_value *value)
850 {
851 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
852 int changed;
853
854 if (value->value.enumerated.item[0] > 1)
855 return -EINVAL;
856
857 changed = value->value.enumerated.item[0] != dummy->iobox;
858 if (changed) {
859 dummy->iobox = value->value.enumerated.item[0];
860
861 if (dummy->iobox) {
862 dummy->cd_volume_ctl->vd[0].access &=
863 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
864 dummy->cd_switch_ctl->vd[0].access &=
865 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
866 } else {
867 dummy->cd_volume_ctl->vd[0].access |=
868 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
869 dummy->cd_switch_ctl->vd[0].access |=
870 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
871 }
872
873 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
874 &dummy->cd_volume_ctl->id);
875 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
876 &dummy->cd_switch_ctl->id);
877 }
878
879 return changed;
880 }
881
882 static struct snd_kcontrol_new snd_dummy_controls[] = {
883 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
884 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
885 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
886 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
887 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
888 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
889 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
890 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
891 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
892 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
893 {
894 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
895 .name = "External I/O Box",
896 .info = snd_dummy_iobox_info,
897 .get = snd_dummy_iobox_get,
898 .put = snd_dummy_iobox_put,
899 },
900 };
901
902 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
903 {
904 struct snd_card *card = dummy->card;
905 struct snd_kcontrol *kcontrol;
906 unsigned int idx;
907 int err;
908
909 spin_lock_init(&dummy->mixer_lock);
910 strcpy(card->mixername, "Dummy Mixer");
911 dummy->iobox = 1;
912
913 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
914 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
915 err = snd_ctl_add(card, kcontrol);
916 if (err < 0)
917 return err;
918 if (!strcmp(kcontrol->id.name, "CD Volume"))
919 dummy->cd_volume_ctl = kcontrol;
920 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
921 dummy->cd_switch_ctl = kcontrol;
922
923 }
924 return 0;
925 }
926
927 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
928 /*
929 * proc interface
930 */
931 static void print_formats(struct snd_dummy *dummy,
932 struct snd_info_buffer *buffer)
933 {
934 int i;
935
936 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
937 if (dummy->pcm_hw.formats & (1ULL << i))
938 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
939 }
940 }
941
942 static void print_rates(struct snd_dummy *dummy,
943 struct snd_info_buffer *buffer)
944 {
945 static int rates[] = {
946 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
947 64000, 88200, 96000, 176400, 192000,
948 };
949 int i;
950
951 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
952 snd_iprintf(buffer, " continuous");
953 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
954 snd_iprintf(buffer, " knot");
955 for (i = 0; i < ARRAY_SIZE(rates); i++)
956 if (dummy->pcm_hw.rates & (1 << i))
957 snd_iprintf(buffer, " %d", rates[i]);
958 }
959
960 #define get_dummy_int_ptr(dummy, ofs) \
961 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
962 #define get_dummy_ll_ptr(dummy, ofs) \
963 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
964
965 struct dummy_hw_field {
966 const char *name;
967 const char *format;
968 unsigned int offset;
969 unsigned int size;
970 };
971 #define FIELD_ENTRY(item, fmt) { \
972 .name = #item, \
973 .format = fmt, \
974 .offset = offsetof(struct snd_pcm_hardware, item), \
975 .size = sizeof(dummy_pcm_hardware.item) }
976
977 static struct dummy_hw_field fields[] = {
978 FIELD_ENTRY(formats, "%#llx"),
979 FIELD_ENTRY(rates, "%#x"),
980 FIELD_ENTRY(rate_min, "%d"),
981 FIELD_ENTRY(rate_max, "%d"),
982 FIELD_ENTRY(channels_min, "%d"),
983 FIELD_ENTRY(channels_max, "%d"),
984 FIELD_ENTRY(buffer_bytes_max, "%ld"),
985 FIELD_ENTRY(period_bytes_min, "%ld"),
986 FIELD_ENTRY(period_bytes_max, "%ld"),
987 FIELD_ENTRY(periods_min, "%d"),
988 FIELD_ENTRY(periods_max, "%d"),
989 };
990
991 static void dummy_proc_read(struct snd_info_entry *entry,
992 struct snd_info_buffer *buffer)
993 {
994 struct snd_dummy *dummy = entry->private_data;
995 int i;
996
997 for (i = 0; i < ARRAY_SIZE(fields); i++) {
998 snd_iprintf(buffer, "%s ", fields[i].name);
999 if (fields[i].size == sizeof(int))
1000 snd_iprintf(buffer, fields[i].format,
1001 *get_dummy_int_ptr(dummy, fields[i].offset));
1002 else
1003 snd_iprintf(buffer, fields[i].format,
1004 *get_dummy_ll_ptr(dummy, fields[i].offset));
1005 if (!strcmp(fields[i].name, "formats"))
1006 print_formats(dummy, buffer);
1007 else if (!strcmp(fields[i].name, "rates"))
1008 print_rates(dummy, buffer);
1009 snd_iprintf(buffer, "\n");
1010 }
1011 }
1012
1013 static void dummy_proc_write(struct snd_info_entry *entry,
1014 struct snd_info_buffer *buffer)
1015 {
1016 struct snd_dummy *dummy = entry->private_data;
1017 char line[64];
1018
1019 while (!snd_info_get_line(buffer, line, sizeof(line))) {
1020 char item[20];
1021 const char *ptr;
1022 unsigned long long val;
1023 int i;
1024
1025 ptr = snd_info_get_str(item, line, sizeof(item));
1026 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1027 if (!strcmp(item, fields[i].name))
1028 break;
1029 }
1030 if (i >= ARRAY_SIZE(fields))
1031 continue;
1032 snd_info_get_str(item, ptr, sizeof(item));
1033 if (kstrtoull(item, 0, &val))
1034 continue;
1035 if (fields[i].size == sizeof(int))
1036 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1037 else
1038 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1039 }
1040 }
1041
1042 static void dummy_proc_init(struct snd_dummy *chip)
1043 {
1044 struct snd_info_entry *entry;
1045
1046 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1047 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1048 entry->c.text.write = dummy_proc_write;
1049 entry->mode |= S_IWUSR;
1050 entry->private_data = chip;
1051 }
1052 }
1053 #else
1054 #define dummy_proc_init(x)
1055 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1056
1057 static int snd_dummy_probe(struct platform_device *devptr)
1058 {
1059 struct snd_card *card;
1060 struct snd_dummy *dummy;
1061 struct dummy_model *m = NULL, **mdl;
1062 int idx, err;
1063 int dev = devptr->id;
1064
1065 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1066 sizeof(struct snd_dummy), &card);
1067 if (err < 0)
1068 return err;
1069 dummy = card->private_data;
1070 dummy->card = card;
1071 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1072 if (strcmp(model[dev], (*mdl)->name) == 0) {
1073 printk(KERN_INFO
1074 "snd-dummy: Using model '%s' for card %i\n",
1075 (*mdl)->name, card->number);
1076 m = dummy->model = *mdl;
1077 break;
1078 }
1079 }
1080 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1081 if (pcm_substreams[dev] < 1)
1082 pcm_substreams[dev] = 1;
1083 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1084 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1085 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1086 if (err < 0)
1087 goto __nodev;
1088 }
1089
1090 dummy->pcm_hw = dummy_pcm_hardware;
1091 if (m) {
1092 if (m->formats)
1093 dummy->pcm_hw.formats = m->formats;
1094 if (m->buffer_bytes_max)
1095 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1096 if (m->period_bytes_min)
1097 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1098 if (m->period_bytes_max)
1099 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1100 if (m->periods_min)
1101 dummy->pcm_hw.periods_min = m->periods_min;
1102 if (m->periods_max)
1103 dummy->pcm_hw.periods_max = m->periods_max;
1104 if (m->rates)
1105 dummy->pcm_hw.rates = m->rates;
1106 if (m->rate_min)
1107 dummy->pcm_hw.rate_min = m->rate_min;
1108 if (m->rate_max)
1109 dummy->pcm_hw.rate_max = m->rate_max;
1110 if (m->channels_min)
1111 dummy->pcm_hw.channels_min = m->channels_min;
1112 if (m->channels_max)
1113 dummy->pcm_hw.channels_max = m->channels_max;
1114 }
1115
1116 err = snd_card_dummy_new_mixer(dummy);
1117 if (err < 0)
1118 goto __nodev;
1119 strcpy(card->driver, "Dummy");
1120 strcpy(card->shortname, "Dummy");
1121 sprintf(card->longname, "Dummy %i", dev + 1);
1122
1123 dummy_proc_init(dummy);
1124
1125 err = snd_card_register(card);
1126 if (err == 0) {
1127 platform_set_drvdata(devptr, card);
1128 return 0;
1129 }
1130 __nodev:
1131 snd_card_free(card);
1132 return err;
1133 }
1134
1135 static int snd_dummy_remove(struct platform_device *devptr)
1136 {
1137 snd_card_free(platform_get_drvdata(devptr));
1138 return 0;
1139 }
1140
1141 #ifdef CONFIG_PM_SLEEP
1142 static int snd_dummy_suspend(struct device *pdev)
1143 {
1144 struct snd_card *card = dev_get_drvdata(pdev);
1145 struct snd_dummy *dummy = card->private_data;
1146
1147 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1148 snd_pcm_suspend_all(dummy->pcm);
1149 return 0;
1150 }
1151
1152 static int snd_dummy_resume(struct device *pdev)
1153 {
1154 struct snd_card *card = dev_get_drvdata(pdev);
1155
1156 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1157 return 0;
1158 }
1159
1160 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1161 #define SND_DUMMY_PM_OPS &snd_dummy_pm
1162 #else
1163 #define SND_DUMMY_PM_OPS NULL
1164 #endif
1165
1166 #define SND_DUMMY_DRIVER "snd_dummy"
1167
1168 static struct platform_driver snd_dummy_driver = {
1169 .probe = snd_dummy_probe,
1170 .remove = snd_dummy_remove,
1171 .driver = {
1172 .name = SND_DUMMY_DRIVER,
1173 .pm = SND_DUMMY_PM_OPS,
1174 },
1175 };
1176
1177 static void snd_dummy_unregister_all(void)
1178 {
1179 int i;
1180
1181 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1182 platform_device_unregister(devices[i]);
1183 platform_driver_unregister(&snd_dummy_driver);
1184 free_fake_buffer();
1185 }
1186
1187 static int __init alsa_card_dummy_init(void)
1188 {
1189 int i, cards, err;
1190
1191 err = platform_driver_register(&snd_dummy_driver);
1192 if (err < 0)
1193 return err;
1194
1195 err = alloc_fake_buffer();
1196 if (err < 0) {
1197 platform_driver_unregister(&snd_dummy_driver);
1198 return err;
1199 }
1200
1201 cards = 0;
1202 for (i = 0; i < SNDRV_CARDS; i++) {
1203 struct platform_device *device;
1204 if (! enable[i])
1205 continue;
1206 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1207 i, NULL, 0);
1208 if (IS_ERR(device))
1209 continue;
1210 if (!platform_get_drvdata(device)) {
1211 platform_device_unregister(device);
1212 continue;
1213 }
1214 devices[i] = device;
1215 cards++;
1216 }
1217 if (!cards) {
1218 #ifdef MODULE
1219 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1220 #endif
1221 snd_dummy_unregister_all();
1222 return -ENODEV;
1223 }
1224 return 0;
1225 }
1226
1227 static void __exit alsa_card_dummy_exit(void)
1228 {
1229 snd_dummy_unregister_all();
1230 }
1231
1232 module_init(alsa_card_dummy_init)
1233 module_exit(alsa_card_dummy_exit)
Linux with added FPC-III support