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Staging: fbtft: fbtft_device: No space is necessary after cast.
[linux/fpc-iii.git] / sound / drivers / dummy.c
blobc0f8f613f1f1b5e954ffa82b760c82353dd17c80
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 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 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, snd_pcm_uframes_t pos,
647 void __user *dst, snd_pcm_uframes_t count)
648 {
649 return 0; /* do nothing */
650 }
651
652 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
653 int channel, snd_pcm_uframes_t pos,
654 snd_pcm_uframes_t count)
655 {
656 return 0; /* do nothing */
657 }
658
659 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
660 unsigned long offset)
661 {
662 return virt_to_page(dummy_page[substream->stream]); /* the same page */
663 }
664
665 static struct snd_pcm_ops dummy_pcm_ops = {
666 .open = dummy_pcm_open,
667 .close = dummy_pcm_close,
668 .ioctl = snd_pcm_lib_ioctl,
669 .hw_params = dummy_pcm_hw_params,
670 .hw_free = dummy_pcm_hw_free,
671 .prepare = dummy_pcm_prepare,
672 .trigger = dummy_pcm_trigger,
673 .pointer = dummy_pcm_pointer,
674 };
675
676 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
677 .open = dummy_pcm_open,
678 .close = dummy_pcm_close,
679 .ioctl = snd_pcm_lib_ioctl,
680 .hw_params = dummy_pcm_hw_params,
681 .hw_free = dummy_pcm_hw_free,
682 .prepare = dummy_pcm_prepare,
683 .trigger = dummy_pcm_trigger,
684 .pointer = dummy_pcm_pointer,
685 .copy = dummy_pcm_copy,
686 .silence = dummy_pcm_silence,
687 .page = dummy_pcm_page,
688 };
689
690 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
691 int substreams)
692 {
693 struct snd_pcm *pcm;
694 struct snd_pcm_ops *ops;
695 int err;
696
697 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
698 substreams, substreams, &pcm);
699 if (err < 0)
700 return err;
701 dummy->pcm = pcm;
702 if (fake_buffer)
703 ops = &dummy_pcm_ops_no_buf;
704 else
705 ops = &dummy_pcm_ops;
706 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
707 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
708 pcm->private_data = dummy;
709 pcm->info_flags = 0;
710 strcpy(pcm->name, "Dummy PCM");
711 if (!fake_buffer) {
712 snd_pcm_lib_preallocate_pages_for_all(pcm,
713 SNDRV_DMA_TYPE_CONTINUOUS,
714 snd_dma_continuous_data(GFP_KERNEL),
715 0, 64*1024);
716 }
717 return 0;
718 }
719
720 /*
721 * mixer interface
722 */
723
724 #define DUMMY_VOLUME(xname, xindex, addr) \
725 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
726 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
727 .name = xname, .index = xindex, \
728 .info = snd_dummy_volume_info, \
729 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
730 .private_value = addr, \
731 .tlv = { .p = db_scale_dummy } }
732
733 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
734 struct snd_ctl_elem_info *uinfo)
735 {
736 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
737 uinfo->count = 2;
738 uinfo->value.integer.min = -50;
739 uinfo->value.integer.max = 100;
740 return 0;
741 }
742
743 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
744 struct snd_ctl_elem_value *ucontrol)
745 {
746 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
747 int addr = kcontrol->private_value;
748
749 spin_lock_irq(&dummy->mixer_lock);
750 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
751 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
752 spin_unlock_irq(&dummy->mixer_lock);
753 return 0;
754 }
755
756 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
757 struct snd_ctl_elem_value *ucontrol)
758 {
759 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
760 int change, addr = kcontrol->private_value;
761 int left, right;
762
763 left = ucontrol->value.integer.value[0];
764 if (left < -50)
765 left = -50;
766 if (left > 100)
767 left = 100;
768 right = ucontrol->value.integer.value[1];
769 if (right < -50)
770 right = -50;
771 if (right > 100)
772 right = 100;
773 spin_lock_irq(&dummy->mixer_lock);
774 change = dummy->mixer_volume[addr][0] != left ||
775 dummy->mixer_volume[addr][1] != right;
776 dummy->mixer_volume[addr][0] = left;
777 dummy->mixer_volume[addr][1] = right;
778 spin_unlock_irq(&dummy->mixer_lock);
779 return change;
780 }
781
782 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
783
784 #define DUMMY_CAPSRC(xname, xindex, addr) \
785 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
786 .info = snd_dummy_capsrc_info, \
787 .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
788 .private_value = addr }
789
790 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
791
792 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
793 struct snd_ctl_elem_value *ucontrol)
794 {
795 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
796 int addr = kcontrol->private_value;
797
798 spin_lock_irq(&dummy->mixer_lock);
799 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
800 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
801 spin_unlock_irq(&dummy->mixer_lock);
802 return 0;
803 }
804
805 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
806 {
807 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
808 int change, addr = kcontrol->private_value;
809 int left, right;
810
811 left = ucontrol->value.integer.value[0] & 1;
812 right = ucontrol->value.integer.value[1] & 1;
813 spin_lock_irq(&dummy->mixer_lock);
814 change = dummy->capture_source[addr][0] != left &&
815 dummy->capture_source[addr][1] != right;
816 dummy->capture_source[addr][0] = left;
817 dummy->capture_source[addr][1] = right;
818 spin_unlock_irq(&dummy->mixer_lock);
819 return change;
820 }
821
822 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
823 struct snd_ctl_elem_info *info)
824 {
825 const char *const names[] = { "None", "CD Player" };
826
827 return snd_ctl_enum_info(info, 1, 2, names);
828 }
829
830 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
831 struct snd_ctl_elem_value *value)
832 {
833 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
834
835 value->value.enumerated.item[0] = dummy->iobox;
836 return 0;
837 }
838
839 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
840 struct snd_ctl_elem_value *value)
841 {
842 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
843 int changed;
844
845 if (value->value.enumerated.item[0] > 1)
846 return -EINVAL;
847
848 changed = value->value.enumerated.item[0] != dummy->iobox;
849 if (changed) {
850 dummy->iobox = value->value.enumerated.item[0];
851
852 if (dummy->iobox) {
853 dummy->cd_volume_ctl->vd[0].access &=
854 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
855 dummy->cd_switch_ctl->vd[0].access &=
856 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
857 } else {
858 dummy->cd_volume_ctl->vd[0].access |=
859 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
860 dummy->cd_switch_ctl->vd[0].access |=
861 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
862 }
863
864 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
865 &dummy->cd_volume_ctl->id);
866 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
867 &dummy->cd_switch_ctl->id);
868 }
869
870 return changed;
871 }
872
873 static struct snd_kcontrol_new snd_dummy_controls[] = {
874 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
875 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
876 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
877 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
878 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
879 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
880 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
881 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
882 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
883 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
884 {
885 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
886 .name = "External I/O Box",
887 .info = snd_dummy_iobox_info,
888 .get = snd_dummy_iobox_get,
889 .put = snd_dummy_iobox_put,
890 },
891 };
892
893 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
894 {
895 struct snd_card *card = dummy->card;
896 struct snd_kcontrol *kcontrol;
897 unsigned int idx;
898 int err;
899
900 spin_lock_init(&dummy->mixer_lock);
901 strcpy(card->mixername, "Dummy Mixer");
902 dummy->iobox = 1;
903
904 for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
905 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
906 err = snd_ctl_add(card, kcontrol);
907 if (err < 0)
908 return err;
909 if (!strcmp(kcontrol->id.name, "CD Volume"))
910 dummy->cd_volume_ctl = kcontrol;
911 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
912 dummy->cd_switch_ctl = kcontrol;
913
914 }
915 return 0;
916 }
917
918 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
919 /*
920 * proc interface
921 */
922 static void print_formats(struct snd_dummy *dummy,
923 struct snd_info_buffer *buffer)
924 {
925 int i;
926
927 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
928 if (dummy->pcm_hw.formats & (1ULL << i))
929 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
930 }
931 }
932
933 static void print_rates(struct snd_dummy *dummy,
934 struct snd_info_buffer *buffer)
935 {
936 static int rates[] = {
937 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
938 64000, 88200, 96000, 176400, 192000,
939 };
940 int i;
941
942 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
943 snd_iprintf(buffer, " continuous");
944 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
945 snd_iprintf(buffer, " knot");
946 for (i = 0; i < ARRAY_SIZE(rates); i++)
947 if (dummy->pcm_hw.rates & (1 << i))
948 snd_iprintf(buffer, " %d", rates[i]);
949 }
950
951 #define get_dummy_int_ptr(dummy, ofs) \
952 (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
953 #define get_dummy_ll_ptr(dummy, ofs) \
954 (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
955
956 struct dummy_hw_field {
957 const char *name;
958 const char *format;
959 unsigned int offset;
960 unsigned int size;
961 };
962 #define FIELD_ENTRY(item, fmt) { \
963 .name = #item, \
964 .format = fmt, \
965 .offset = offsetof(struct snd_pcm_hardware, item), \
966 .size = sizeof(dummy_pcm_hardware.item) }
967
968 static struct dummy_hw_field fields[] = {
969 FIELD_ENTRY(formats, "%#llx"),
970 FIELD_ENTRY(rates, "%#x"),
971 FIELD_ENTRY(rate_min, "%d"),
972 FIELD_ENTRY(rate_max, "%d"),
973 FIELD_ENTRY(channels_min, "%d"),
974 FIELD_ENTRY(channels_max, "%d"),
975 FIELD_ENTRY(buffer_bytes_max, "%ld"),
976 FIELD_ENTRY(period_bytes_min, "%ld"),
977 FIELD_ENTRY(period_bytes_max, "%ld"),
978 FIELD_ENTRY(periods_min, "%d"),
979 FIELD_ENTRY(periods_max, "%d"),
980 };
981
982 static void dummy_proc_read(struct snd_info_entry *entry,
983 struct snd_info_buffer *buffer)
984 {
985 struct snd_dummy *dummy = entry->private_data;
986 int i;
987
988 for (i = 0; i < ARRAY_SIZE(fields); i++) {
989 snd_iprintf(buffer, "%s ", fields[i].name);
990 if (fields[i].size == sizeof(int))
991 snd_iprintf(buffer, fields[i].format,
992 *get_dummy_int_ptr(dummy, fields[i].offset));
993 else
994 snd_iprintf(buffer, fields[i].format,
995 *get_dummy_ll_ptr(dummy, fields[i].offset));
996 if (!strcmp(fields[i].name, "formats"))
997 print_formats(dummy, buffer);
998 else if (!strcmp(fields[i].name, "rates"))
999 print_rates(dummy, buffer);
1000 snd_iprintf(buffer, "\n");
1001 }
1002 }
1003
1004 static void dummy_proc_write(struct snd_info_entry *entry,
1005 struct snd_info_buffer *buffer)
1006 {
1007 struct snd_dummy *dummy = entry->private_data;
1008 char line[64];
1009
1010 while (!snd_info_get_line(buffer, line, sizeof(line))) {
1011 char item[20];
1012 const char *ptr;
1013 unsigned long long val;
1014 int i;
1015
1016 ptr = snd_info_get_str(item, line, sizeof(item));
1017 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1018 if (!strcmp(item, fields[i].name))
1019 break;
1020 }
1021 if (i >= ARRAY_SIZE(fields))
1022 continue;
1023 snd_info_get_str(item, ptr, sizeof(item));
1024 if (kstrtoull(item, 0, &val))
1025 continue;
1026 if (fields[i].size == sizeof(int))
1027 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1028 else
1029 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1030 }
1031 }
1032
1033 static void dummy_proc_init(struct snd_dummy *chip)
1034 {
1035 struct snd_info_entry *entry;
1036
1037 if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1038 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1039 entry->c.text.write = dummy_proc_write;
1040 entry->mode |= S_IWUSR;
1041 entry->private_data = chip;
1042 }
1043 }
1044 #else
1045 #define dummy_proc_init(x)
1046 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1047
1048 static int snd_dummy_probe(struct platform_device *devptr)
1049 {
1050 struct snd_card *card;
1051 struct snd_dummy *dummy;
1052 struct dummy_model *m = NULL, **mdl;
1053 int idx, err;
1054 int dev = devptr->id;
1055
1056 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1057 sizeof(struct snd_dummy), &card);
1058 if (err < 0)
1059 return err;
1060 dummy = card->private_data;
1061 dummy->card = card;
1062 for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1063 if (strcmp(model[dev], (*mdl)->name) == 0) {
1064 printk(KERN_INFO
1065 "snd-dummy: Using model '%s' for card %i\n",
1066 (*mdl)->name, card->number);
1067 m = dummy->model = *mdl;
1068 break;
1069 }
1070 }
1071 for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1072 if (pcm_substreams[dev] < 1)
1073 pcm_substreams[dev] = 1;
1074 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1075 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1076 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1077 if (err < 0)
1078 goto __nodev;
1079 }
1080
1081 dummy->pcm_hw = dummy_pcm_hardware;
1082 if (m) {
1083 if (m->formats)
1084 dummy->pcm_hw.formats = m->formats;
1085 if (m->buffer_bytes_max)
1086 dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1087 if (m->period_bytes_min)
1088 dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1089 if (m->period_bytes_max)
1090 dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1091 if (m->periods_min)
1092 dummy->pcm_hw.periods_min = m->periods_min;
1093 if (m->periods_max)
1094 dummy->pcm_hw.periods_max = m->periods_max;
1095 if (m->rates)
1096 dummy->pcm_hw.rates = m->rates;
1097 if (m->rate_min)
1098 dummy->pcm_hw.rate_min = m->rate_min;
1099 if (m->rate_max)
1100 dummy->pcm_hw.rate_max = m->rate_max;
1101 if (m->channels_min)
1102 dummy->pcm_hw.channels_min = m->channels_min;
1103 if (m->channels_max)
1104 dummy->pcm_hw.channels_max = m->channels_max;
1105 }
1106
1107 err = snd_card_dummy_new_mixer(dummy);
1108 if (err < 0)
1109 goto __nodev;
1110 strcpy(card->driver, "Dummy");
1111 strcpy(card->shortname, "Dummy");
1112 sprintf(card->longname, "Dummy %i", dev + 1);
1113
1114 dummy_proc_init(dummy);
1115
1116 err = snd_card_register(card);
1117 if (err == 0) {
1118 platform_set_drvdata(devptr, card);
1119 return 0;
1120 }
1121 __nodev:
1122 snd_card_free(card);
1123 return err;
1124 }
1125
1126 static int snd_dummy_remove(struct platform_device *devptr)
1127 {
1128 snd_card_free(platform_get_drvdata(devptr));
1129 return 0;
1130 }
1131
1132 #ifdef CONFIG_PM_SLEEP
1133 static int snd_dummy_suspend(struct device *pdev)
1134 {
1135 struct snd_card *card = dev_get_drvdata(pdev);
1136 struct snd_dummy *dummy = card->private_data;
1137
1138 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1139 snd_pcm_suspend_all(dummy->pcm);
1140 return 0;
1141 }
1142
1143 static int snd_dummy_resume(struct device *pdev)
1144 {
1145 struct snd_card *card = dev_get_drvdata(pdev);
1146
1147 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1148 return 0;
1149 }
1150
1151 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1152 #define SND_DUMMY_PM_OPS &snd_dummy_pm
1153 #else
1154 #define SND_DUMMY_PM_OPS NULL
1155 #endif
1156
1157 #define SND_DUMMY_DRIVER "snd_dummy"
1158
1159 static struct platform_driver snd_dummy_driver = {
1160 .probe = snd_dummy_probe,
1161 .remove = snd_dummy_remove,
1162 .driver = {
1163 .name = SND_DUMMY_DRIVER,
1164 .pm = SND_DUMMY_PM_OPS,
1165 },
1166 };
1167
1168 static void snd_dummy_unregister_all(void)
1169 {
1170 int i;
1171
1172 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1173 platform_device_unregister(devices[i]);
1174 platform_driver_unregister(&snd_dummy_driver);
1175 free_fake_buffer();
1176 }
1177
1178 static int __init alsa_card_dummy_init(void)
1179 {
1180 int i, cards, err;
1181
1182 err = platform_driver_register(&snd_dummy_driver);
1183 if (err < 0)
1184 return err;
1185
1186 err = alloc_fake_buffer();
1187 if (err < 0) {
1188 platform_driver_unregister(&snd_dummy_driver);
1189 return err;
1190 }
1191
1192 cards = 0;
1193 for (i = 0; i < SNDRV_CARDS; i++) {
1194 struct platform_device *device;
1195 if (! enable[i])
1196 continue;
1197 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1198 i, NULL, 0);
1199 if (IS_ERR(device))
1200 continue;
1201 if (!platform_get_drvdata(device)) {
1202 platform_device_unregister(device);
1203 continue;
1204 }
1205 devices[i] = device;
1206 cards++;
1207 }
1208 if (!cards) {
1209 #ifdef MODULE
1210 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1211 #endif
1212 snd_dummy_unregister_all();
1213 return -ENODEV;
1214 }
1215 return 0;
1216 }
1217
1218 static void __exit alsa_card_dummy_exit(void)
1219 {
1220 snd_dummy_unregister_all();
1221 }
1222
1223 module_init(alsa_card_dummy_init)
1224 module_exit(alsa_card_dummy_exit)
Linux with added FPC-III support