?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
pid: Handle failure to allocate the first pid in a pid namespace
[cris-mirror.git] / sound / drivers / dummy.c
blob7b2b1f766b00153c7af74c327963ee3eb81ddbcf
1 /*
2 * Dummy soundcard
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21 #include <linux/init.h>
22 #include <linux/err.h>
23 #include <linux/platform_device.h>
24 #include <linux/jiffies.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/wait.h>
28 #include <linux/hrtimer.h>
29 #include <linux/math64.h>
30 #include <linux/module.h>
31 #include <sound/core.h>
32 #include <sound/control.h>
33 #include <sound/tlv.h>
34 #include <sound/pcm.h>
35 #include <sound/rawmidi.h>
36 #include <sound/info.h>
37 #include <sound/initval.h>
38
39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
40 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
41 MODULE_LICENSE("GPL");
42 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
43
44 #define MAX_PCM_DEVICES 4
45 #define MAX_PCM_SUBSTREAMS 128
46 #define MAX_MIDI_DEVICES 2
47
48 /* defaults */
49 #define MAX_BUFFER_SIZE (64*1024)
50 #define MIN_PERIOD_SIZE 64
51 #define MAX_PERIOD_SIZE MAX_BUFFER_SIZE
52 #define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
53 #define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
54 #define USE_RATE_MIN 5500
55 #define USE_RATE_MAX 48000
56 #define USE_CHANNELS_MIN 1
57 #define USE_CHANNELS_MAX 2
58 #define USE_PERIODS_MIN 1
59 #define USE_PERIODS_MAX 1024
60
61 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
62 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
63 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
64 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
65 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
66 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
67 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
68 #ifdef CONFIG_HIGH_RES_TIMERS
69 static bool hrtimer = 1;
70 #endif
71 static bool fake_buffer = 1;
72
73 module_param_array(index, int, NULL, 0444);
74 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
75 module_param_array(id, charp, NULL, 0444);
76 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
77 module_param_array(enable, bool, NULL, 0444);
78 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
79 module_param_array(model, charp, NULL, 0444);
80 MODULE_PARM_DESC(model, "Soundcard model.");
81 module_param_array(pcm_devs, int, NULL, 0444);
82 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
83 module_param_array(pcm_substreams, int, NULL, 0444);
84 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
85 //module_param_array(midi_devs, int, NULL, 0444);
86 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
87 module_param(fake_buffer, bool, 0444);
88 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
89 #ifdef CONFIG_HIGH_RES_TIMERS
90 module_param(hrtimer, bool, 0644);
91 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
92 #endif
93
94 static struct platform_device *devices[SNDRV_CARDS];
95
96 #define MIXER_ADDR_MASTER 0
97 #define MIXER_ADDR_LINE 1
98 #define MIXER_ADDR_MIC 2
99 #define MIXER_ADDR_SYNTH 3
100 #define MIXER_ADDR_CD 4
101 #define MIXER_ADDR_LAST 4
102
103 struct dummy_timer_ops {
104 int (*create)(struct snd_pcm_substream *);
105 void (*free)(struct snd_pcm_substream *);
106 int (*prepare)(struct snd_pcm_substream *);
107 int (*start)(struct snd_pcm_substream *);
108 int (*stop)(struct snd_pcm_substream *);
109 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
110 };
111
112 #define get_dummy_ops(substream) \
113 (*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
114
115 struct dummy_model {
116 const char *name;
117 int (*playback_constraints)(struct snd_pcm_runtime *runtime);
118 int (*capture_constraints)(struct snd_pcm_runtime *runtime);
119 u64 formats;
120 size_t buffer_bytes_max;
121 size_t period_bytes_min;
122 size_t period_bytes_max;
123 unsigned int periods_min;
124 unsigned int periods_max;
125 unsigned int rates;
126 unsigned int rate_min;
127 unsigned int rate_max;
128 unsigned int channels_min;
129 unsigned int channels_max;
130 };
131
132 struct snd_dummy {
133 struct snd_card *card;
134 struct dummy_model *model;
135 struct snd_pcm *pcm;
136 struct snd_pcm_hardware pcm_hw;
137 spinlock_t mixer_lock;
138 int mixer_volume[MIXER_ADDR_LAST+1][2];
139 int capture_source[MIXER_ADDR_LAST+1][2];
140 int iobox;
141 struct snd_kcontrol *cd_volume_ctl;
142 struct snd_kcontrol *cd_switch_ctl;
143 };
144
145 /*
146 * card models
147 */
148
149 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
150 {
151 int err;
152 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
153 if (err < 0)
154 return err;
155 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
156 if (err < 0)
157 return err;
158 return 0;
159 }
160
161 static struct dummy_model model_emu10k1 = {
162 .name = "emu10k1",
163 .playback_constraints = emu10k1_playback_constraints,
164 .buffer_bytes_max = 128 * 1024,
165 };
166
167 static struct dummy_model model_rme9652 = {
168 .name = "rme9652",
169 .buffer_bytes_max = 26 * 64 * 1024,
170 .formats = SNDRV_PCM_FMTBIT_S32_LE,
171 .channels_min = 26,
172 .channels_max = 26,
173 .periods_min = 2,
174 .periods_max = 2,
175 };
176
177 static struct dummy_model model_ice1712 = {
178 .name = "ice1712",
179 .buffer_bytes_max = 256 * 1024,
180 .formats = SNDRV_PCM_FMTBIT_S32_LE,
181 .channels_min = 10,
182 .channels_max = 10,
183 .periods_min = 1,
184 .periods_max = 1024,
185 };
186
187 static struct dummy_model model_uda1341 = {
188 .name = "uda1341",
189 .buffer_bytes_max = 16380,
190 .formats = SNDRV_PCM_FMTBIT_S16_LE,
191 .channels_min = 2,
192 .channels_max = 2,
193 .periods_min = 2,
194 .periods_max = 255,
195 };
196
197 static struct dummy_model model_ac97 = {
198 .name = "ac97",
199 .formats = SNDRV_PCM_FMTBIT_S16_LE,
200 .channels_min = 2,
201 .channels_max = 2,
202 .rates = SNDRV_PCM_RATE_48000,
203 .rate_min = 48000,
204 .rate_max = 48000,
205 };
206
207 static struct dummy_model model_ca0106 = {
208 .name = "ca0106",
209 .formats = SNDRV_PCM_FMTBIT_S16_LE,
210 .buffer_bytes_max = ((65536-64)*8),
211 .period_bytes_max = (65536-64),
212 .periods_min = 2,
213 .periods_max = 8,
214 .channels_min = 2,
215 .channels_max = 2,
216 .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
217 .rate_min = 48000,
218 .rate_max = 192000,
219 };
220
221 static struct dummy_model *dummy_models[] = {
222 &model_emu10k1,
223 &model_rme9652,
224 &model_ice1712,
225 &model_uda1341,
226 &model_ac97,
227 &model_ca0106,
228 NULL
229 };
230
231 /*
232 * system timer interface
233 */
234
235 struct dummy_systimer_pcm {
236 /* ops must be the first item */
237 const struct dummy_timer_ops *timer_ops;
238 spinlock_t lock;
239 struct timer_list timer;
240 unsigned long base_time;
241 unsigned int frac_pos; /* fractional sample position (based HZ) */
242 unsigned int frac_period_rest;
243 unsigned int frac_buffer_size; /* buffer_size * HZ */
244 unsigned int frac_period_size; /* period_size * HZ */
245 unsigned int rate;
246 int elapsed;
247 struct snd_pcm_substream *substream;
248 };
249
250 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
251 {
252 mod_timer(&dpcm->timer, jiffies +
253 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
254 }
255
256 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
257 {
258 unsigned long delta;
259
260 delta = jiffies - dpcm->base_time;
261 if (!delta)
262 return;
263 dpcm->base_time += delta;
264 delta *= dpcm->rate;
265 dpcm->frac_pos += delta;
266 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
267 dpcm->frac_pos -= dpcm->frac_buffer_size;
268 while (dpcm->frac_period_rest <= delta) {
269 dpcm->elapsed++;
270 dpcm->frac_period_rest += dpcm->frac_period_size;
271 }
272 dpcm->frac_period_rest -= delta;
273 }
274
275 static int dummy_systimer_start(struct snd_pcm_substream *substream)
276 {
277 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
278 spin_lock(&dpcm->lock);
279 dpcm->base_time = jiffies;
280 dummy_systimer_rearm(dpcm);
281 spin_unlock(&dpcm->lock);
282 return 0;
283 }
284
285 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
286 {
287 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
288 spin_lock(&dpcm->lock);
289 del_timer(&dpcm->timer);
290 spin_unlock(&dpcm->lock);
291 return 0;
292 }
293
294 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
295 {
296 struct snd_pcm_runtime *runtime = substream->runtime;
297 struct dummy_systimer_pcm *dpcm = runtime->private_data;
298
299 dpcm->frac_pos = 0;
300 dpcm->rate = runtime->rate;
301 dpcm->frac_buffer_size = runtime->buffer_size * HZ;
302 dpcm->frac_period_size = runtime->period_size * HZ;
303 dpcm->frac_period_rest = dpcm->frac_period_size;
304 dpcm->elapsed = 0;
305
306 return 0;
307 }
308
309 static void dummy_systimer_callback(struct timer_list *t)
310 {
311 struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer);
312 unsigned long flags;
313 int elapsed = 0;
314
315 spin_lock_irqsave(&dpcm->lock, flags);
316 dummy_systimer_update(dpcm);
317 dummy_systimer_rearm(dpcm);
318 elapsed = dpcm->elapsed;
319 dpcm->elapsed = 0;
320 spin_unlock_irqrestore(&dpcm->lock, flags);
321 if (elapsed)
322 snd_pcm_period_elapsed(dpcm->substream);
323 }
324
325 static snd_pcm_uframes_t
326 dummy_systimer_pointer(struct snd_pcm_substream *substream)
327 {
328 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
329 snd_pcm_uframes_t pos;
330
331 spin_lock(&dpcm->lock);
332 dummy_systimer_update(dpcm);
333 pos = dpcm->frac_pos / HZ;
334 spin_unlock(&dpcm->lock);
335 return pos;
336 }
337
338 static int dummy_systimer_create(struct snd_pcm_substream *substream)
339 {
340 struct dummy_systimer_pcm *dpcm;
341
342 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
343 if (!dpcm)
344 return -ENOMEM;
345 substream->runtime->private_data = dpcm;
346 timer_setup(&dpcm->timer, dummy_systimer_callback, 0);
347 spin_lock_init(&dpcm->lock);
348 dpcm->substream = substream;
349 return 0;
350 }
351
352 static void dummy_systimer_free(struct snd_pcm_substream *substream)
353 {
354 kfree(substream->runtime->private_data);
355 }
356
357 static const struct dummy_timer_ops dummy_systimer_ops = {
358 .create = dummy_systimer_create,
359 .free = dummy_systimer_free,
360 .prepare = dummy_systimer_prepare,
361 .start = dummy_systimer_start,
362 .stop = dummy_systimer_stop,
363 .pointer = dummy_systimer_pointer,
364 };
365
366 #ifdef CONFIG_HIGH_RES_TIMERS
367 /*
368 * hrtimer interface
369 */
370
371 struct dummy_hrtimer_pcm {
372 /* ops must be the first item */
373 const struct dummy_timer_ops *timer_ops;
374 ktime_t base_time;
375 ktime_t period_time;
376 atomic_t running;
377 struct hrtimer timer;
378 struct tasklet_struct tasklet;
379 struct snd_pcm_substream *substream;
380 };
381
382 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
383 {
384 struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
385 if (atomic_read(&dpcm->running))
386 snd_pcm_period_elapsed(dpcm->substream);
387 }
388
389 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
390 {
391 struct dummy_hrtimer_pcm *dpcm;
392
393 dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
394 if (!atomic_read(&dpcm->running))
395 return HRTIMER_NORESTART;
396 tasklet_schedule(&dpcm->tasklet);
397 hrtimer_forward_now(timer, dpcm->period_time);
398 return HRTIMER_RESTART;
399 }
400
401 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
402 {
403 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
404
405 dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
406 hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
407 atomic_set(&dpcm->running, 1);
408 return 0;
409 }
410
411 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
412 {
413 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
414
415 atomic_set(&dpcm->running, 0);
416 hrtimer_cancel(&dpcm->timer);
417 return 0;
418 }
419
420 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
421 {
422 hrtimer_cancel(&dpcm->timer);
423 tasklet_kill(&dpcm->tasklet);
424 }
425
426 static snd_pcm_uframes_t
427 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
428 {
429 struct snd_pcm_runtime *runtime = substream->runtime;
430 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
431 u64 delta;
432 u32 pos;
433
434 delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
435 dpcm->base_time);
436 delta = div_u64(delta * runtime->rate + 999999, 1000000);
437 div_u64_rem(delta, runtime->buffer_size, &pos);
438 return pos;
439 }
440
441 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
442 {
443 struct snd_pcm_runtime *runtime = substream->runtime;
444 struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
445 unsigned int period, rate;
446 long sec;
447 unsigned long nsecs;
448
449 dummy_hrtimer_sync(dpcm);
450 period = runtime->period_size;
451 rate = runtime->rate;
452 sec = period / rate;
453 period %= rate;
454 nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
455 dpcm->period_time = ktime_set(sec, nsecs);
456
457 return 0;
458 }
459
460 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
461 {
462 struct dummy_hrtimer_pcm *dpcm;
463
464 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
465 if (!dpcm)
466 return -ENOMEM;
467 substream->runtime->private_data = dpcm;
468 hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
469 dpcm->timer.function = dummy_hrtimer_callback;
470 dpcm->substream = substream;
471 atomic_set(&dpcm->running, 0);
472 tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
473 (unsigned long)dpcm);
474 return 0;
475 }
476
477 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
478 {
479 struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
480 dummy_hrtimer_sync(dpcm);
481 kfree(dpcm);
482 }
483
484 static const struct dummy_timer_ops dummy_hrtimer_ops = {
485 .create = dummy_hrtimer_create,
486 .free = dummy_hrtimer_free,
487 .prepare = dummy_hrtimer_prepare,
488 .start = dummy_hrtimer_start,
489 .stop = dummy_hrtimer_stop,
490 .pointer = dummy_hrtimer_pointer,
491 };
492
493 #endif /* CONFIG_HIGH_RES_TIMERS */
494
495 /*
496 * PCM interface
497 */
498
499 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
500 {
501 switch (cmd) {
502 case SNDRV_PCM_TRIGGER_START:
503 case SNDRV_PCM_TRIGGER_RESUME:
504 return get_dummy_ops(substream)->start(substream);
505 case SNDRV_PCM_TRIGGER_STOP:
506 case SNDRV_PCM_TRIGGER_SUSPEND:
507 return get_dummy_ops(substream)->stop(substream);
508 }
509 return -EINVAL;
510 }
511
512 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
513 {
514 return get_dummy_ops(substream)->prepare(substream);
515 }
516
517 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
518 {
519 return get_dummy_ops(substream)->pointer(substream);
520 }
521
522 static const struct snd_pcm_hardware dummy_pcm_hardware = {
523 .info = (SNDRV_PCM_INFO_MMAP |
524 SNDRV_PCM_INFO_INTERLEAVED |
525 SNDRV_PCM_INFO_RESUME |
526 SNDRV_PCM_INFO_MMAP_VALID),
527 .formats = USE_FORMATS,
528 .rates = USE_RATE,
529 .rate_min = USE_RATE_MIN,
530 .rate_max = USE_RATE_MAX,
531 .channels_min = USE_CHANNELS_MIN,
532 .channels_max = USE_CHANNELS_MAX,
533 .buffer_bytes_max = MAX_BUFFER_SIZE,
534 .period_bytes_min = MIN_PERIOD_SIZE,
535 .period_bytes_max = MAX_PERIOD_SIZE,
536 .periods_min = USE_PERIODS_MIN,
537 .periods_max = USE_PERIODS_MAX,
538 .fifo_size = 0,
539 };
540
541 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
542 struct snd_pcm_hw_params *hw_params)
543 {
544 if (fake_buffer) {
545 /* runtime->dma_bytes has to be set manually to allow mmap */
546 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
547 return 0;
548 }
549 return snd_pcm_lib_malloc_pages(substream,
550 params_buffer_bytes(hw_params));
551 }
552
553 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
554 {
555 if (fake_buffer)
556 return 0;
557 return snd_pcm_lib_free_pages(substream);
558 }
559
560 static int dummy_pcm_open(struct snd_pcm_substream *substream)
561 {
562 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
563 struct dummy_model *model = dummy->model;
564 struct snd_pcm_runtime *runtime = substream->runtime;
565 const struct dummy_timer_ops *ops;
566 int err;
567
568 ops = &dummy_systimer_ops;
569 #ifdef CONFIG_HIGH_RES_TIMERS
570 if (hrtimer)
571 ops = &dummy_hrtimer_ops;
572 #endif
573
574 err = ops->create(substream);
575 if (err < 0)
576 return err;
577 get_dummy_ops(substream) = ops;
578
579 runtime->hw = dummy->pcm_hw;
580 if (substream->pcm->device & 1) {
581 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
582 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
583 }
584 if (substream->pcm->device & 2)
585 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
586 SNDRV_PCM_INFO_MMAP_VALID);
587
588 if (model == NULL)
589 return 0;
590
591 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
592 if (model->playback_constraints)
593 err = model->playback_constraints(substream->runtime);
594 } else {
595 if (model->capture_constraints)
596 err = model->capture_constraints(substream->runtime);
597 }
598 if (err < 0) {
599 get_dummy_ops(substream)->free(substream);
600 return err;
601 }
602 return 0;
603 }
604
605 static int dummy_pcm_close(struct snd_pcm_substream *substream)
606 {
607 get_dummy_ops(substream)->free(substream);
608 return 0;
609 }
610
611 /*
612 * dummy buffer handling
613 */
614
615 static void *dummy_page[2];
616
617 static void free_fake_buffer(void)
618 {
619 if (fake_buffer) {
620 int i;
621 for (i = 0; i < 2; i++)
622 if (dummy_page[i]) {
623 free_page((unsigned long)dummy_page[i]);
624 dummy_page[i] = NULL;
625 }
626 }
627 }
628
629 static int alloc_fake_buffer(void)
630 {
631 int i;
632
633 if (!fake_buffer)
634 return 0;
635 for (i = 0; i < 2; i++) {
636 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
637 if (!dummy_page[i]) {
638 free_fake_buffer();
639 return -ENOMEM;
640 }
641 }
642 return 0;
643 }
644
645 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
646 int channel, unsigned long pos,
647 void __user *dst, unsigned long bytes)
648 {
649 return 0; /* do nothing */
650 }
651
652 static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
653 int channel, unsigned long pos,
654 void *dst, unsigned long bytes)
655 {
656 return 0; /* do nothing */
657 }
658
659 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
660 int channel, unsigned long pos,
661 unsigned long bytes)
662 {
663 return 0; /* do nothing */
664 }
665
666 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
667 unsigned long offset)
668 {
669 return virt_to_page(dummy_page[substream->stream]); /* the same page */
670 }
671
672 static struct snd_pcm_ops dummy_pcm_ops = {
673 .open = dummy_pcm_open,
674 .close = dummy_pcm_close,
675 .ioctl = snd_pcm_lib_ioctl,
676 .hw_params = dummy_pcm_hw_params,
677 .hw_free = dummy_pcm_hw_free,
678 .prepare = dummy_pcm_prepare,
679 .trigger = dummy_pcm_trigger,
680 .pointer = dummy_pcm_pointer,
681 };
682
683 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
684 .open = dummy_pcm_open,
685 .close = dummy_pcm_close,
686 .ioctl = snd_pcm_lib_ioctl,
687 .hw_params = dummy_pcm_hw_params,
688 .hw_free = dummy_pcm_hw_free,
689 .prepare = dummy_pcm_prepare,
690 .trigger = dummy_pcm_trigger,
691 .pointer = dummy_pcm_pointer,
692 .copy_user = dummy_pcm_copy,
693 .copy_kernel = dummy_pcm_copy_kernel,
694 .fill_silence = dummy_pcm_silence,
695 .page = dummy_pcm_page,
696 };
697
698 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
699 int substreams)
700 {
701 struct snd_pcm *pcm;
702 struct snd_pcm_ops *ops;
703 int err;
704
705 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
706 substreams, substreams, &pcm);
707 if (err < 0)
708 return err;
709 dummy->pcm = pcm;
710 if (fake_buffer)
711 ops = &dummy_pcm_ops_no_buf;
712 else
713 ops = &dummy_pcm_ops;
714 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
715 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
716 pcm->private_data = dummy;
717 pcm->info_flags = 0;
718 strcpy(pcm->name, "Dummy PCM");
719 if (!fake_buffer) {
720 snd_pcm_lib_preallocate_pages_for_all(pcm,
721 SNDRV_DMA_TYPE_CONTINUOUS,
722 snd_dma_continuous_data(GFP_KERNEL),
723 0, 64*1024);
724 }
725 return 0;
726 }
727
728 /*
729 * mixer interface
730 */
731
732 #define DUMMY_VOLUME(xname, xindex, addr) \
733 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
734 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
735 .name = xname, .index = xindex, \
736 .info = snd_dummy_volume_info, \
737 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
738 .private_value = addr, \
739 .tlv = { .p = db_scale_dummy } }
740
741 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
742 struct snd_ctl_elem_info *uinfo)
743 {
744 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
745 uinfo->count = 2;
746 uinfo->value.integer.min = -50;
747 uinfo->value.integer.max = 100;
748 return 0;
749 }
750
751 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
752 struct snd_ctl_elem_value *ucontrol)
753 {
754 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
755 int addr = kcontrol->private_value;
756
757 spin_lock_irq(&dummy->mixer_lock);
758 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
759 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
760 spin_unlock_irq(&dummy->mixer_lock);
761 return 0;
762 }
763
764 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
765 struct snd_ctl_elem_value *ucontrol)
766 {
767 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
768 int change, addr = kcontrol->private_value;
769 int left, right;
770
771 left = ucontrol->value.integer.value[0];
772 if (left < -50)
773 left = -50;
774 if (left > 100)
775 left = 100;
776 right = ucontrol->value.integer.value[1];
777 if (right < -50)
778 right = -50;
779 if (right > 100)
780 right = 100;
781 spin_lock_irq(&dummy->mixer_lock);
782 change = dummy->mixer_volume[addr][0] != left ||
783 dummy->mixer_volume[addr][1] != right;
784 dummy->mixer_volume[addr][0] = left;
785 dummy->mixer_volume[addr][1] = right;
786 spin_unlock_irq(&dummy->mixer_lock);
787 return change;
788 }
789
790 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
791
792 #define DUMMY_CAPSRC(xname, xindex, addr) \
793 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
794 .info = snd_dummy_capsrc_info, \
795 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
796 .private_value = addr }
797
798 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
799
800 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
801 struct snd_ctl_elem_value *ucontrol)
802 {
803 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
804 int addr = kcontrol->private_value;
805
806 spin_lock_irq(&dummy->mixer_lock);
807 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
808 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
809 spin_unlock_irq(&dummy->mixer_lock);
810 return 0;
811 }
812
813 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
814 {
815 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
816 int change, addr = kcontrol->private_value;
817 int left, right;
818
819 left = ucontrol->value.integer.value[0] & 1;
820 right = ucontrol->value.integer.value[1] & 1;
821 spin_lock_irq(&dummy->mixer_lock);
822 change = dummy->capture_source[addr][0] != left &&
823 dummy->capture_source[addr][1] != right;
824 dummy->capture_source[addr][0] = left;
825 dummy->capture_source[addr][1] = right;
826 spin_unlock_irq(&dummy->mixer_lock);
827 return change;
828 }
829
830 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
831 struct snd_ctl_elem_info *info)
832 {
833 const char *const names[] = { "None", "CD Player" };
834
835 return snd_ctl_enum_info(info, 1, 2, names);
836 }
837
838 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
839 struct snd_ctl_elem_value *value)
840 {
841 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
842
843 value->value.enumerated.item[0] = dummy->iobox;
844 return 0;
845 }
846
847 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
848 struct snd_ctl_elem_value *value)
849 {
850 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
851 int changed;
852
853 if (value->value.enumerated.item[0] > 1)
854 return -EINVAL;
855
856 changed = value->value.enumerated.item[0] != dummy->iobox;
857 if (changed) {
858 dummy->iobox = value->value.enumerated.item[0];
859
860 if (dummy->iobox) {
861 dummy->cd_volume_ctl->vd[0].access &=
862 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
863 dummy->cd_switch_ctl->vd[0].access &=
864 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
865 } else {
866 dummy->cd_volume_ctl->vd[0].access |=
867 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
868 dummy->cd_switch_ctl->vd[0].access |=
869 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
870 }
871
872 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
873 &dummy->cd_volume_ctl->id);
874 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
875 &dummy->cd_switch_ctl->id);
876 }
877
878 return changed;
879 }
880
881 static struct snd_kcontrol_new snd_dummy_controls[] = {
882 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
883 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
884 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
885 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
886 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
887 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
888 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
889 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
890 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
891 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
892 {
893 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
894 .name = "External I/O Box",
895 .info = snd_dummy_iobox_info,
896 .get = snd_dummy_iobox_get,
897 .put = snd_dummy_iobox_put,
898 },
899 };
900
901 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
902 {
903 struct snd_card *card = dummy->card;
904 struct snd_kcontrol *kcontrol;
905 unsigned int idx;
906 int err;
907
908 spin_lock_init(&dummy->mixer_lock);
909 strcpy(card->mixername, "Dummy Mixer");
910 dummy->iobox = 1;
911
912 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
913 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
914 err = snd_ctl_add(card, kcontrol);
915 if (err < 0)
916 return err;
917 if (!strcmp(kcontrol->id.name, "CD Volume"))
918 dummy->cd_volume_ctl = kcontrol;
919 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
920 dummy->cd_switch_ctl = kcontrol;
921
922 }
923 return 0;
924 }
925
926 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
927 /*
928 * proc interface
929 */
930 static void print_formats(struct snd_dummy *dummy,
931 struct snd_info_buffer *buffer)
932 {
933 int i;
934
935 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
936 if (dummy->pcm_hw.formats & (1ULL << i))
937 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
938 }
939 }
940
941 static void print_rates(struct snd_dummy *dummy,
942 struct snd_info_buffer *buffer)
943 {
944 static int rates[] = {
945 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
946 64000, 88200, 96000, 176400, 192000,
947 };
948 int i;
949
950 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
951 snd_iprintf(buffer, " continuous");
952 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
953 snd_iprintf(buffer, " knot");
954 for (i = 0; i < ARRAY_SIZE(rates); i++)
955 if (dummy->pcm_hw.rates & (1 << i))
956 snd_iprintf(buffer, " %d", rates[i]);
957 }
958
959 #define get_dummy_int_ptr(dummy, ofs) \
960 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
961 #define get_dummy_ll_ptr(dummy, ofs) \
962 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
963
964 struct dummy_hw_field {
965 const char *name;
966 const char *format;
967 unsigned int offset;
968 unsigned int size;
969 };
970 #define FIELD_ENTRY(item, fmt) { \
971 .name = #item, \
972 .format = fmt, \
973 .offset = offsetof(struct snd_pcm_hardware, item), \
974 .size = sizeof(dummy_pcm_hardware.item) }
975
976 static struct dummy_hw_field fields[] = {
977 FIELD_ENTRY(formats, "%#llx"),
978 FIELD_ENTRY(rates, "%#x"),
979 FIELD_ENTRY(rate_min, "%d"),
980 FIELD_ENTRY(rate_max, "%d"),
981 FIELD_ENTRY(channels_min, "%d"),
982 FIELD_ENTRY(channels_max, "%d"),
983 FIELD_ENTRY(buffer_bytes_max, "%ld"),
984 FIELD_ENTRY(period_bytes_min, "%ld"),
985 FIELD_ENTRY(period_bytes_max, "%ld"),
986 FIELD_ENTRY(periods_min, "%d"),
987 FIELD_ENTRY(periods_max, "%d"),
988 };
989
990 static void dummy_proc_read(struct snd_info_entry *entry,
991 struct snd_info_buffer *buffer)
992 {
993 struct snd_dummy *dummy = entry->private_data;
994 int i;
995
996 for (i = 0; i < ARRAY_SIZE(fields); i++) {
997 snd_iprintf(buffer, "%s ", fields[i].name);
998 if (fields[i].size == sizeof(int))
999 snd_iprintf(buffer, fields[i].format,
1000 *get_dummy_int_ptr(dummy, fields[i].offset));
1001 else
1002 snd_iprintf(buffer, fields[i].format,
1003 *get_dummy_ll_ptr(dummy, fields[i].offset));
1004 if (!strcmp(fields[i].name, "formats"))
1005 print_formats(dummy, buffer);
1006 else if (!strcmp(fields[i].name, "rates"))
1007 print_rates(dummy, buffer);
1008 snd_iprintf(buffer, "\n");
1009 }
1010 }
1011
1012 static void dummy_proc_write(struct snd_info_entry *entry,
1013 struct snd_info_buffer *buffer)
1014 {
1015 struct snd_dummy *dummy = entry->private_data;
1016 char line[64];
1017
1018 while (!snd_info_get_line(buffer, line, sizeof(line))) {
1019 char item[20];
1020 const char *ptr;
1021 unsigned long long val;
1022 int i;
1023
1024 ptr = snd_info_get_str(item, line, sizeof(item));
1025 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1026 if (!strcmp(item, fields[i].name))
1027 break;
1028 }
1029 if (i >= ARRAY_SIZE(fields))
1030 continue;
1031 snd_info_get_str(item, ptr, sizeof(item));
1032 if (kstrtoull(item, 0, &val))
1033 continue;
1034 if (fields[i].size == sizeof(int))
1035 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1036 else
1037 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1038 }
1039 }
1040
1041 static void dummy_proc_init(struct snd_dummy *chip)
1042 {
1043 struct snd_info_entry *entry;
1044
1045 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1046 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1047 entry->c.text.write = dummy_proc_write;
1048 entry->mode |= S_IWUSR;
1049 entry->private_data = chip;
1050 }
1051 }
1052 #else
1053 #define dummy_proc_init(x)
1054 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1055
1056 static int snd_dummy_probe(struct platform_device *devptr)
1057 {
1058 struct snd_card *card;
1059 struct snd_dummy *dummy;
1060 struct dummy_model *m = NULL, **mdl;
1061 int idx, err;
1062 int dev = devptr->id;
1063
1064 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1065 sizeof(struct snd_dummy), &card);
1066 if (err < 0)
1067 return err;
1068 dummy = card->private_data;
1069 dummy->card = card;
1070 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1071 if (strcmp(model[dev], (*mdl)->name) == 0) {
1072 printk(KERN_INFO
1073 "snd-dummy: Using model '%s' for card %i\n",
1074 (*mdl)->name, card->number);
1075 m = dummy->model = *mdl;
1076 break;
1077 }
1078 }
1079 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1080 if (pcm_substreams[dev] < 1)
1081 pcm_substreams[dev] = 1;
1082 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1083 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1084 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1085 if (err < 0)
1086 goto __nodev;
1087 }
1088
1089 dummy->pcm_hw = dummy_pcm_hardware;
1090 if (m) {
1091 if (m->formats)
1092 dummy->pcm_hw.formats = m->formats;
1093 if (m->buffer_bytes_max)
1094 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1095 if (m->period_bytes_min)
1096 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1097 if (m->period_bytes_max)
1098 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1099 if (m->periods_min)
1100 dummy->pcm_hw.periods_min = m->periods_min;
1101 if (m->periods_max)
1102 dummy->pcm_hw.periods_max = m->periods_max;
1103 if (m->rates)
1104 dummy->pcm_hw.rates = m->rates;
1105 if (m->rate_min)
1106 dummy->pcm_hw.rate_min = m->rate_min;
1107 if (m->rate_max)
1108 dummy->pcm_hw.rate_max = m->rate_max;
1109 if (m->channels_min)
1110 dummy->pcm_hw.channels_min = m->channels_min;
1111 if (m->channels_max)
1112 dummy->pcm_hw.channels_max = m->channels_max;
1113 }
1114
1115 err = snd_card_dummy_new_mixer(dummy);
1116 if (err < 0)
1117 goto __nodev;
1118 strcpy(card->driver, "Dummy");
1119 strcpy(card->shortname, "Dummy");
1120 sprintf(card->longname, "Dummy %i", dev + 1);
1121
1122 dummy_proc_init(dummy);
1123
1124 err = snd_card_register(card);
1125 if (err == 0) {
1126 platform_set_drvdata(devptr, card);
1127 return 0;
1128 }
1129 __nodev:
1130 snd_card_free(card);
1131 return err;
1132 }
1133
1134 static int snd_dummy_remove(struct platform_device *devptr)
1135 {
1136 snd_card_free(platform_get_drvdata(devptr));
1137 return 0;
1138 }
1139
1140 #ifdef CONFIG_PM_SLEEP
1141 static int snd_dummy_suspend(struct device *pdev)
1142 {
1143 struct snd_card *card = dev_get_drvdata(pdev);
1144 struct snd_dummy *dummy = card->private_data;
1145
1146 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1147 snd_pcm_suspend_all(dummy->pcm);
1148 return 0;
1149 }
1150
1151 static int snd_dummy_resume(struct device *pdev)
1152 {
1153 struct snd_card *card = dev_get_drvdata(pdev);
1154
1155 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1156 return 0;
1157 }
1158
1159 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1160 #define SND_DUMMY_PM_OPS &snd_dummy_pm
1161 #else
1162 #define SND_DUMMY_PM_OPS NULL
1163 #endif
1164
1165 #define SND_DUMMY_DRIVER "snd_dummy"
1166
1167 static struct platform_driver snd_dummy_driver = {
1168 .probe = snd_dummy_probe,
1169 .remove = snd_dummy_remove,
1170 .driver = {
1171 .name = SND_DUMMY_DRIVER,
1172 .pm = SND_DUMMY_PM_OPS,
1173 },
1174 };
1175
1176 static void snd_dummy_unregister_all(void)
1177 {
1178 int i;
1179
1180 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1181 platform_device_unregister(devices[i]);
1182 platform_driver_unregister(&snd_dummy_driver);
1183 free_fake_buffer();
1184 }
1185
1186 static int __init alsa_card_dummy_init(void)
1187 {
1188 int i, cards, err;
1189
1190 err = platform_driver_register(&snd_dummy_driver);
1191 if (err < 0)
1192 return err;
1193
1194 err = alloc_fake_buffer();
1195 if (err < 0) {
1196 platform_driver_unregister(&snd_dummy_driver);
1197 return err;
1198 }
1199
1200 cards = 0;
1201 for (i = 0; i < SNDRV_CARDS; i++) {
1202 struct platform_device *device;
1203 if (! enable[i])
1204 continue;
1205 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1206 i, NULL, 0);
1207 if (IS_ERR(device))
1208 continue;
1209 if (!platform_get_drvdata(device)) {
1210 platform_device_unregister(device);
1211 continue;
1212 }
1213 devices[i] = device;
1214 cards++;
1215 }
1216 if (!cards) {
1217 #ifdef MODULE
1218 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1219 #endif
1220 snd_dummy_unregister_all();
1221 return -ENODEV;
1222 }
1223 return 0;
1224 }
1225
1226 static void __exit alsa_card_dummy_exit(void)
1227 {
1228 snd_dummy_unregister_all();
1229 }
1230
1231 module_init(alsa_card_dummy_init)
1232 module_exit(alsa_card_dummy_exit)
CRIS linux kernel tree