ALSA: snd-aloop: Fix hw_params restrictions and checking
[deliverable/linux.git] / sound / drivers / aloop.c
1 /*
2 * Loopback soundcard
3 *
4 * Original code:
5 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
6 *
7 * More accurate positioning and full-duplex support:
8 * Copyright (c) Ahmet İnan <ainan at mathematik.uni-freiburg.de>
9 *
10 * Major (almost complete) rewrite:
11 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
12 *
13 * A next major update in 2010 (separate timers for playback and capture):
14 * Copyright (c) Jaroslav Kysela <perex@perex.cz>
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 */
31
32 #include <linux/init.h>
33 #include <linux/jiffies.h>
34 #include <linux/slab.h>
35 #include <linux/time.h>
36 #include <linux/wait.h>
37 #include <linux/moduleparam.h>
38 #include <linux/platform_device.h>
39 #include <sound/core.h>
40 #include <sound/control.h>
41 #include <sound/pcm.h>
42 #include <sound/initval.h>
43
44 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
45 MODULE_DESCRIPTION("A loopback soundcard");
46 MODULE_LICENSE("GPL");
47 MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}");
48
49 #define MAX_PCM_SUBSTREAMS 8
50
51 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
52 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
53 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
54 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
55 static int pcm_notify[SNDRV_CARDS];
56
57 module_param_array(index, int, NULL, 0444);
58 MODULE_PARM_DESC(index, "Index value for loopback soundcard.");
59 module_param_array(id, charp, NULL, 0444);
60 MODULE_PARM_DESC(id, "ID string for loopback soundcard.");
61 module_param_array(enable, bool, NULL, 0444);
62 MODULE_PARM_DESC(enable, "Enable this loopback soundcard.");
63 module_param_array(pcm_substreams, int, NULL, 0444);
64 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver.");
65 module_param_array(pcm_notify, int, NULL, 0444);
66 MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes.");
67
68 #define NO_PITCH 100000
69
70 struct loopback_pcm;
71
72 struct loopback_cable {
73 spinlock_t lock;
74 struct loopback_pcm *streams[2];
75 struct snd_pcm_hardware hw;
76 /* flags */
77 unsigned int valid;
78 unsigned int running;
79 };
80
81 struct loopback_setup {
82 unsigned int notify: 1;
83 unsigned int rate_shift;
84 unsigned int format;
85 unsigned int rate;
86 unsigned int channels;
87 struct snd_ctl_elem_id active_id;
88 struct snd_ctl_elem_id format_id;
89 struct snd_ctl_elem_id rate_id;
90 struct snd_ctl_elem_id channels_id;
91 };
92
93 struct loopback {
94 struct snd_card *card;
95 struct mutex cable_lock;
96 struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2];
97 struct snd_pcm *pcm[2];
98 struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2];
99 };
100
101 struct loopback_pcm {
102 struct loopback *loopback;
103 struct snd_pcm_substream *substream;
104 struct loopback_cable *cable;
105 unsigned int pcm_buffer_size;
106 unsigned int buf_pos; /* position in buffer */
107 unsigned int silent_size;
108 /* PCM parameters */
109 unsigned int pcm_period_size;
110 unsigned int pcm_bps; /* bytes per second */
111 unsigned int pcm_salign; /* bytes per sample * channels */
112 unsigned int pcm_rate_shift; /* rate shift value */
113 /* flags */
114 unsigned int period_update_pending :1;
115 /* timer stuff */
116 unsigned int irq_pos; /* fractional IRQ position */
117 unsigned int period_size_frac;
118 unsigned long last_jiffies;
119 struct timer_list timer;
120 };
121
122 static struct platform_device *devices[SNDRV_CARDS];
123
124 static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x)
125 {
126 if (dpcm->pcm_rate_shift == NO_PITCH) {
127 x /= HZ;
128 } else {
129 x = div_u64(NO_PITCH * (unsigned long long)x,
130 HZ * (unsigned long long)dpcm->pcm_rate_shift);
131 }
132 return x - (x % dpcm->pcm_salign);
133 }
134
135 static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x)
136 {
137 if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */
138 return x * HZ;
139 } else {
140 x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ,
141 NO_PITCH);
142 }
143 return x;
144 }
145
146 static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm)
147 {
148 int device = dpcm->substream->pstr->pcm->device;
149
150 if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
151 device ^= 1;
152 return &dpcm->loopback->setup[dpcm->substream->number][device];
153 }
154
155 static inline unsigned int get_notify(struct loopback_pcm *dpcm)
156 {
157 return get_setup(dpcm)->notify;
158 }
159
160 static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)
161 {
162 return get_setup(dpcm)->rate_shift;
163 }
164
165 static void loopback_timer_start(struct loopback_pcm *dpcm)
166 {
167 unsigned long tick;
168 unsigned int rate_shift = get_rate_shift(dpcm);
169
170 if (rate_shift != dpcm->pcm_rate_shift) {
171 dpcm->pcm_rate_shift = rate_shift;
172 dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);
173 }
174 tick = dpcm->period_size_frac - dpcm->irq_pos;
175 tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps;
176 dpcm->timer.expires = jiffies + tick;
177 add_timer(&dpcm->timer);
178 }
179
180 static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
181 {
182 del_timer(&dpcm->timer);
183 }
184
185 #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK)
186 #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE)
187 #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE)
188
189 static int loopback_check_format(struct loopback_cable *cable, int stream)
190 {
191 struct snd_pcm_runtime *runtime, *cruntime;
192 struct loopback_setup *setup;
193 struct snd_card *card;
194 int check;
195
196 if (cable->valid != CABLE_VALID_BOTH) {
197 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
198 goto __notify;
199 return 0;
200 }
201 runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
202 substream->runtime;
203 cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
204 substream->runtime;
205 check = runtime->format != cruntime->format ||
206 runtime->rate != cruntime->rate ||
207 runtime->channels != cruntime->channels;
208 if (!check)
209 return 0;
210 if (stream == SNDRV_PCM_STREAM_CAPTURE) {
211 return -EIO;
212 } else {
213 snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
214 substream, SNDRV_PCM_STATE_DRAINING);
215 __notify:
216 runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
217 substream->runtime;
218 setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]);
219 card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card;
220 if (setup->format != runtime->format) {
221 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
222 &setup->format_id);
223 setup->format = runtime->format;
224 }
225 if (setup->rate != runtime->rate) {
226 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
227 &setup->rate_id);
228 setup->rate = runtime->rate;
229 }
230 if (setup->channels != runtime->channels) {
231 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
232 &setup->channels_id);
233 setup->channels = runtime->channels;
234 }
235 }
236 return 0;
237 }
238
239 static void loopback_active_notify(struct loopback_pcm *dpcm)
240 {
241 snd_ctl_notify(dpcm->loopback->card,
242 SNDRV_CTL_EVENT_MASK_VALUE,
243 &get_setup(dpcm)->active_id);
244 }
245
246 static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
247 {
248 struct snd_pcm_runtime *runtime = substream->runtime;
249 struct loopback_pcm *dpcm = runtime->private_data;
250 struct loopback_cable *cable = dpcm->cable;
251 int err;
252
253 switch (cmd) {
254 case SNDRV_PCM_TRIGGER_START:
255 err = loopback_check_format(cable, substream->stream);
256 if (err < 0)
257 return err;
258 dpcm->last_jiffies = jiffies;
259 dpcm->pcm_rate_shift = 0;
260 loopback_timer_start(dpcm);
261 cable->running |= (1 << substream->stream);
262 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
263 loopback_active_notify(dpcm);
264 break;
265 case SNDRV_PCM_TRIGGER_STOP:
266 cable->running &= ~(1 << substream->stream);
267 loopback_timer_stop(dpcm);
268 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
269 loopback_active_notify(dpcm);
270 break;
271 default:
272 return -EINVAL;
273 }
274 return 0;
275 }
276
277 static void params_change_substream(struct loopback_pcm *dpcm,
278 struct snd_pcm_runtime *runtime)
279 {
280 struct snd_pcm_runtime *dst_runtime;
281
282 if (dpcm == NULL || dpcm->substream == NULL)
283 return;
284 dst_runtime = dpcm->substream->runtime;
285 if (dst_runtime == NULL)
286 return;
287 dst_runtime->hw = dpcm->cable->hw;
288 }
289
290 static void params_change(struct snd_pcm_substream *substream)
291 {
292 struct snd_pcm_runtime *runtime = substream->runtime;
293 struct loopback_pcm *dpcm = runtime->private_data;
294 struct loopback_cable *cable = dpcm->cable;
295
296 cable->hw.formats = (1ULL << runtime->format);
297 cable->hw.rate_min = runtime->rate;
298 cable->hw.rate_max = runtime->rate;
299 cable->hw.channels_min = runtime->channels;
300 cable->hw.channels_max = runtime->channels;
301 params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK],
302 runtime);
303 params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE],
304 runtime);
305 }
306
307 static int loopback_prepare(struct snd_pcm_substream *substream)
308 {
309 struct snd_pcm_runtime *runtime = substream->runtime;
310 struct loopback_pcm *dpcm = runtime->private_data;
311 struct loopback_cable *cable = dpcm->cable;
312 int bps, salign;
313
314 salign = (snd_pcm_format_width(runtime->format) *
315 runtime->channels) / 8;
316 bps = salign * runtime->rate;
317 if (bps <= 0 || salign <= 0)
318 return -EINVAL;
319
320 dpcm->buf_pos = 0;
321 dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
322 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
323 /* clear capture buffer */
324 dpcm->silent_size = dpcm->pcm_buffer_size;
325 snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
326 runtime->buffer_size * runtime->channels);
327 }
328
329 dpcm->irq_pos = 0;
330 dpcm->period_update_pending = 0;
331 dpcm->pcm_bps = bps;
332 dpcm->pcm_salign = salign;
333 dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);
334
335 mutex_lock(&dpcm->loopback->cable_lock);
336 if (!(cable->valid & ~(1 << substream->stream)) ||
337 (get_setup(dpcm)->notify &&
338 substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
339 params_change(substream);
340 cable->valid |= 1 << substream->stream;
341 mutex_unlock(&dpcm->loopback->cable_lock);
342
343 return 0;
344 }
345
346 static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes)
347 {
348 struct snd_pcm_runtime *runtime = dpcm->substream->runtime;
349 char *dst = runtime->dma_area;
350 unsigned int dst_off = dpcm->buf_pos;
351
352 if (dpcm->silent_size >= dpcm->pcm_buffer_size)
353 return;
354 if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size)
355 bytes = dpcm->pcm_buffer_size - dpcm->silent_size;
356
357 for (;;) {
358 unsigned int size = bytes;
359 if (dst_off + size > dpcm->pcm_buffer_size)
360 size = dpcm->pcm_buffer_size - dst_off;
361 snd_pcm_format_set_silence(runtime->format, dst + dst_off,
362 bytes_to_frames(runtime, size) *
363 runtime->channels);
364 dpcm->silent_size += size;
365 bytes -= size;
366 if (!bytes)
367 break;
368 dst_off = 0;
369 }
370 }
371
372 static void copy_play_buf(struct loopback_pcm *play,
373 struct loopback_pcm *capt,
374 unsigned int bytes)
375 {
376 struct snd_pcm_runtime *runtime = play->substream->runtime;
377 char *src = runtime->dma_area;
378 char *dst = capt->substream->runtime->dma_area;
379 unsigned int src_off = play->buf_pos;
380 unsigned int dst_off = capt->buf_pos;
381 unsigned int clear_bytes = 0;
382
383 /* check if playback is draining, trim the capture copy size
384 * when our pointer is at the end of playback ring buffer */
385 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
386 snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) {
387 snd_pcm_uframes_t appl_ptr, appl_ptr1, diff;
388 appl_ptr = appl_ptr1 = runtime->control->appl_ptr;
389 appl_ptr1 -= appl_ptr1 % runtime->buffer_size;
390 appl_ptr1 += play->buf_pos / play->pcm_salign;
391 if (appl_ptr < appl_ptr1)
392 appl_ptr1 -= runtime->buffer_size;
393 diff = (appl_ptr - appl_ptr1) * play->pcm_salign;
394 if (diff < bytes) {
395 clear_bytes = bytes - diff;
396 bytes = diff;
397 }
398 }
399
400 for (;;) {
401 unsigned int size = bytes;
402 if (src_off + size > play->pcm_buffer_size)
403 size = play->pcm_buffer_size - src_off;
404 if (dst_off + size > capt->pcm_buffer_size)
405 size = capt->pcm_buffer_size - dst_off;
406 memcpy(dst + dst_off, src + src_off, size);
407 capt->silent_size = 0;
408 bytes -= size;
409 if (!bytes)
410 break;
411 src_off = (src_off + size) % play->pcm_buffer_size;
412 dst_off = (dst_off + size) % capt->pcm_buffer_size;
413 }
414
415 if (clear_bytes > 0) {
416 clear_capture_buf(capt, clear_bytes);
417 capt->silent_size = 0;
418 }
419 }
420
421 #define BYTEPOS_UPDATE_POSONLY 0
422 #define BYTEPOS_UPDATE_CLEAR 1
423 #define BYTEPOS_UPDATE_COPY 2
424
425 static void loopback_bytepos_update(struct loopback_pcm *dpcm,
426 unsigned int delta,
427 unsigned int cmd)
428 {
429 unsigned int count;
430 unsigned long last_pos;
431
432 last_pos = byte_pos(dpcm, dpcm->irq_pos);
433 dpcm->irq_pos += delta * dpcm->pcm_bps;
434 count = byte_pos(dpcm, dpcm->irq_pos) - last_pos;
435 if (!count)
436 return;
437 if (cmd == BYTEPOS_UPDATE_CLEAR)
438 clear_capture_buf(dpcm, count);
439 else if (cmd == BYTEPOS_UPDATE_COPY)
440 copy_play_buf(dpcm->cable->streams[SNDRV_PCM_STREAM_PLAYBACK],
441 dpcm->cable->streams[SNDRV_PCM_STREAM_CAPTURE],
442 count);
443 dpcm->buf_pos += count;
444 dpcm->buf_pos %= dpcm->pcm_buffer_size;
445 if (dpcm->irq_pos >= dpcm->period_size_frac) {
446 dpcm->irq_pos %= dpcm->period_size_frac;
447 dpcm->period_update_pending = 1;
448 }
449 }
450
451 static void loopback_pos_update(struct loopback_cable *cable)
452 {
453 struct loopback_pcm *dpcm_play =
454 cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
455 struct loopback_pcm *dpcm_capt =
456 cable->streams[SNDRV_PCM_STREAM_CAPTURE];
457 unsigned long delta_play = 0, delta_capt = 0;
458
459 spin_lock(&cable->lock);
460 if (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
461 delta_play = jiffies - dpcm_play->last_jiffies;
462 dpcm_play->last_jiffies += delta_play;
463 }
464
465 if (cable->running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
466 delta_capt = jiffies - dpcm_capt->last_jiffies;
467 dpcm_capt->last_jiffies += delta_capt;
468 }
469
470 if (delta_play == 0 && delta_capt == 0) {
471 spin_unlock(&cable->lock);
472 return;
473 }
474
475 if (delta_play > delta_capt) {
476 loopback_bytepos_update(dpcm_play, delta_play - delta_capt,
477 BYTEPOS_UPDATE_POSONLY);
478 delta_play = delta_capt;
479 } else if (delta_play < delta_capt) {
480 loopback_bytepos_update(dpcm_capt, delta_capt - delta_play,
481 BYTEPOS_UPDATE_CLEAR);
482 delta_capt = delta_play;
483 }
484
485 if (delta_play == 0 && delta_capt == 0) {
486 spin_unlock(&cable->lock);
487 return;
488 }
489 /* note delta_capt == delta_play at this moment */
490 loopback_bytepos_update(dpcm_capt, delta_capt, BYTEPOS_UPDATE_COPY);
491 loopback_bytepos_update(dpcm_play, delta_play, BYTEPOS_UPDATE_POSONLY);
492 spin_unlock(&cable->lock);
493 }
494
495 static void loopback_timer_function(unsigned long data)
496 {
497 struct loopback_pcm *dpcm = (struct loopback_pcm *)data;
498 int stream;
499
500 loopback_pos_update(dpcm->cable);
501 stream = dpcm->substream->stream;
502 if (dpcm->cable->running & (1 << stream))
503 loopback_timer_start(dpcm);
504 if (dpcm->period_update_pending) {
505 dpcm->period_update_pending = 0;
506 if (dpcm->cable->running & (1 << stream))
507 snd_pcm_period_elapsed(dpcm->substream);
508 }
509 }
510
511 static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
512 {
513 struct snd_pcm_runtime *runtime = substream->runtime;
514 struct loopback_pcm *dpcm = runtime->private_data;
515
516 loopback_pos_update(dpcm->cable);
517 return bytes_to_frames(runtime, dpcm->buf_pos);
518 }
519
520 static struct snd_pcm_hardware loopback_pcm_hardware =
521 {
522 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP |
523 SNDRV_PCM_INFO_MMAP_VALID),
524 .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
525 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |
526 SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE),
527 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000,
528 .rate_min = 8000,
529 .rate_max = 192000,
530 .channels_min = 1,
531 .channels_max = 32,
532 .buffer_bytes_max = 2 * 1024 * 1024,
533 .period_bytes_min = 64,
534 .period_bytes_max = 2 * 1024 * 1024,
535 .periods_min = 1,
536 .periods_max = 1024,
537 .fifo_size = 0,
538 };
539
540 static void loopback_runtime_free(struct snd_pcm_runtime *runtime)
541 {
542 struct loopback_pcm *dpcm = runtime->private_data;
543 kfree(dpcm);
544 }
545
546 static int loopback_hw_params(struct snd_pcm_substream *substream,
547 struct snd_pcm_hw_params *params)
548 {
549 return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
550 }
551
552 static int loopback_hw_free(struct snd_pcm_substream *substream)
553 {
554 struct snd_pcm_runtime *runtime = substream->runtime;
555 struct loopback_pcm *dpcm = runtime->private_data;
556 struct loopback_cable *cable = dpcm->cable;
557
558 mutex_lock(&dpcm->loopback->cable_lock);
559 cable->valid &= ~(1 << substream->stream);
560 mutex_unlock(&dpcm->loopback->cable_lock);
561 return snd_pcm_lib_free_pages(substream);
562 }
563
564 static unsigned int get_cable_index(struct snd_pcm_substream *substream)
565 {
566 if (!substream->pcm->device)
567 return substream->stream;
568 else
569 return !substream->stream;
570 }
571
572 static int rule_format(struct snd_pcm_hw_params *params,
573 struct snd_pcm_hw_rule *rule)
574 {
575
576 struct snd_pcm_hardware *hw = rule->private;
577 struct snd_mask *maskp = hw_param_mask(params, rule->var);
578
579 maskp->bits[0] &= (u_int32_t)hw->formats;
580 maskp->bits[1] &= (u_int32_t)(hw->formats >> 32);
581 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
582 if (! maskp->bits[0] && ! maskp->bits[1])
583 return -EINVAL;
584 return 0;
585 }
586
587 static int rule_rate(struct snd_pcm_hw_params *params,
588 struct snd_pcm_hw_rule *rule)
589 {
590 struct snd_pcm_hardware *hw = rule->private;
591 struct snd_interval t;
592
593 t.min = hw->rate_min;
594 t.max = hw->rate_max;
595 t.openmin = t.openmax = 0;
596 t.integer = 0;
597 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
598 }
599
600 static int rule_channels(struct snd_pcm_hw_params *params,
601 struct snd_pcm_hw_rule *rule)
602 {
603 struct snd_pcm_hardware *hw = rule->private;
604 struct snd_interval t;
605
606 t.min = hw->channels_min;
607 t.max = hw->channels_max;
608 t.openmin = t.openmax = 0;
609 t.integer = 0;
610 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
611 }
612
613 static int loopback_open(struct snd_pcm_substream *substream)
614 {
615 struct snd_pcm_runtime *runtime = substream->runtime;
616 struct loopback *loopback = substream->private_data;
617 struct loopback_pcm *dpcm;
618 struct loopback_cable *cable;
619 int err = 0;
620 int dev = get_cable_index(substream);
621
622 mutex_lock(&loopback->cable_lock);
623 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
624 if (!dpcm) {
625 err = -ENOMEM;
626 goto unlock;
627 }
628 dpcm->loopback = loopback;
629 dpcm->substream = substream;
630 setup_timer(&dpcm->timer, loopback_timer_function,
631 (unsigned long)dpcm);
632
633 cable = loopback->cables[substream->number][dev];
634 if (!cable) {
635 cable = kzalloc(sizeof(*cable), GFP_KERNEL);
636 if (!cable) {
637 kfree(dpcm);
638 err = -ENOMEM;
639 goto unlock;
640 }
641 spin_lock_init(&cable->lock);
642 cable->hw = loopback_pcm_hardware;
643 loopback->cables[substream->number][dev] = cable;
644 }
645 dpcm->cable = cable;
646 cable->streams[substream->stream] = dpcm;
647
648 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
649
650 /* use dynamic rules based on actual runtime->hw values */
651 /* note that the default rules created in the PCM midlevel code */
652 /* are cached -> they do not reflect the actual state */
653 err = snd_pcm_hw_rule_add(runtime, 0,
654 SNDRV_PCM_HW_PARAM_FORMAT,
655 rule_format, &runtime->hw,
656 SNDRV_PCM_HW_PARAM_FORMAT, -1);
657 if (err < 0)
658 goto unlock;
659 err = snd_pcm_hw_rule_add(runtime, 0,
660 SNDRV_PCM_HW_PARAM_RATE,
661 rule_rate, &runtime->hw,
662 SNDRV_PCM_HW_PARAM_RATE, -1);
663 if (err < 0)
664 goto unlock;
665 err = snd_pcm_hw_rule_add(runtime, 0,
666 SNDRV_PCM_HW_PARAM_CHANNELS,
667 rule_channels, &runtime->hw,
668 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
669 if (err < 0)
670 goto unlock;
671
672 runtime->private_data = dpcm;
673 runtime->private_free = loopback_runtime_free;
674 if (get_notify(dpcm))
675 runtime->hw = loopback_pcm_hardware;
676 else
677 runtime->hw = cable->hw;
678 unlock:
679 mutex_unlock(&loopback->cable_lock);
680 return err;
681 }
682
683 static int loopback_close(struct snd_pcm_substream *substream)
684 {
685 struct loopback *loopback = substream->private_data;
686 struct loopback_pcm *dpcm = substream->runtime->private_data;
687 struct loopback_cable *cable;
688 int dev = get_cable_index(substream);
689
690 loopback_timer_stop(dpcm);
691 mutex_lock(&loopback->cable_lock);
692 cable = loopback->cables[substream->number][dev];
693 if (cable->streams[!substream->stream]) {
694 /* other stream is still alive */
695 cable->streams[substream->stream] = NULL;
696 } else {
697 /* free the cable */
698 loopback->cables[substream->number][dev] = NULL;
699 kfree(cable);
700 }
701 mutex_unlock(&loopback->cable_lock);
702 return 0;
703 }
704
705 static struct snd_pcm_ops loopback_playback_ops = {
706 .open = loopback_open,
707 .close = loopback_close,
708 .ioctl = snd_pcm_lib_ioctl,
709 .hw_params = loopback_hw_params,
710 .hw_free = loopback_hw_free,
711 .prepare = loopback_prepare,
712 .trigger = loopback_trigger,
713 .pointer = loopback_pointer,
714 };
715
716 static struct snd_pcm_ops loopback_capture_ops = {
717 .open = loopback_open,
718 .close = loopback_close,
719 .ioctl = snd_pcm_lib_ioctl,
720 .hw_params = loopback_hw_params,
721 .hw_free = loopback_hw_free,
722 .prepare = loopback_prepare,
723 .trigger = loopback_trigger,
724 .pointer = loopback_pointer,
725 };
726
727 static int __devinit loopback_pcm_new(struct loopback *loopback,
728 int device, int substreams)
729 {
730 struct snd_pcm *pcm;
731 int err;
732
733 err = snd_pcm_new(loopback->card, "Loopback PCM", device,
734 substreams, substreams, &pcm);
735 if (err < 0)
736 return err;
737 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops);
738 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops);
739
740 pcm->private_data = loopback;
741 pcm->info_flags = 0;
742 strcpy(pcm->name, "Loopback PCM");
743
744 loopback->pcm[device] = pcm;
745
746 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
747 snd_dma_continuous_data(GFP_KERNEL),
748 0, 2 * 1024 * 1024);
749 return 0;
750 }
751
752 static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol,
753 struct snd_ctl_elem_info *uinfo)
754 {
755 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
756 uinfo->count = 1;
757 uinfo->value.integer.min = 80000;
758 uinfo->value.integer.max = 120000;
759 uinfo->value.integer.step = 1;
760 return 0;
761 }
762
763 static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol,
764 struct snd_ctl_elem_value *ucontrol)
765 {
766 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
767
768 ucontrol->value.integer.value[0] =
769 loopback->setup[kcontrol->id.subdevice]
770 [kcontrol->id.device].rate_shift;
771 return 0;
772 }
773
774 static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol,
775 struct snd_ctl_elem_value *ucontrol)
776 {
777 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
778 unsigned int val;
779 int change = 0;
780
781 val = ucontrol->value.integer.value[0];
782 if (val < 80000)
783 val = 80000;
784 if (val > 120000)
785 val = 120000;
786 mutex_lock(&loopback->cable_lock);
787 if (val != loopback->setup[kcontrol->id.subdevice]
788 [kcontrol->id.device].rate_shift) {
789 loopback->setup[kcontrol->id.subdevice]
790 [kcontrol->id.device].rate_shift = val;
791 change = 1;
792 }
793 mutex_unlock(&loopback->cable_lock);
794 return change;
795 }
796
797 static int loopback_notify_get(struct snd_kcontrol *kcontrol,
798 struct snd_ctl_elem_value *ucontrol)
799 {
800 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
801
802 ucontrol->value.integer.value[0] =
803 loopback->setup[kcontrol->id.subdevice]
804 [kcontrol->id.device].notify;
805 return 0;
806 }
807
808 static int loopback_notify_put(struct snd_kcontrol *kcontrol,
809 struct snd_ctl_elem_value *ucontrol)
810 {
811 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
812 unsigned int val;
813 int change = 0;
814
815 val = ucontrol->value.integer.value[0] ? 1 : 0;
816 if (val != loopback->setup[kcontrol->id.subdevice]
817 [kcontrol->id.device].notify) {
818 loopback->setup[kcontrol->id.subdevice]
819 [kcontrol->id.device].notify = val;
820 change = 1;
821 }
822 return change;
823 }
824
825 static int loopback_active_get(struct snd_kcontrol *kcontrol,
826 struct snd_ctl_elem_value *ucontrol)
827 {
828 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
829 struct loopback_cable *cable = loopback->cables
830 [kcontrol->id.subdevice][kcontrol->id.device ^ 1];
831 unsigned int val = 0;
832
833 if (cable != NULL)
834 val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
835 1 : 0;
836 ucontrol->value.integer.value[0] = val;
837 return 0;
838 }
839
840 static int loopback_format_info(struct snd_kcontrol *kcontrol,
841 struct snd_ctl_elem_info *uinfo)
842 {
843 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
844 uinfo->count = 1;
845 uinfo->value.integer.min = 0;
846 uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST;
847 uinfo->value.integer.step = 1;
848 return 0;
849 }
850
851 static int loopback_format_get(struct snd_kcontrol *kcontrol,
852 struct snd_ctl_elem_value *ucontrol)
853 {
854 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
855
856 ucontrol->value.integer.value[0] =
857 loopback->setup[kcontrol->id.subdevice]
858 [kcontrol->id.device].format;
859 return 0;
860 }
861
862 static int loopback_rate_info(struct snd_kcontrol *kcontrol,
863 struct snd_ctl_elem_info *uinfo)
864 {
865 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
866 uinfo->count = 1;
867 uinfo->value.integer.min = 0;
868 uinfo->value.integer.max = 192000;
869 uinfo->value.integer.step = 1;
870 return 0;
871 }
872
873 static int loopback_rate_get(struct snd_kcontrol *kcontrol,
874 struct snd_ctl_elem_value *ucontrol)
875 {
876 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
877
878 ucontrol->value.integer.value[0] =
879 loopback->setup[kcontrol->id.subdevice]
880 [kcontrol->id.device].rate;
881 return 0;
882 }
883
884 static int loopback_channels_info(struct snd_kcontrol *kcontrol,
885 struct snd_ctl_elem_info *uinfo)
886 {
887 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
888 uinfo->count = 1;
889 uinfo->value.integer.min = 1;
890 uinfo->value.integer.max = 1024;
891 uinfo->value.integer.step = 1;
892 return 0;
893 }
894
895 static int loopback_channels_get(struct snd_kcontrol *kcontrol,
896 struct snd_ctl_elem_value *ucontrol)
897 {
898 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
899
900 ucontrol->value.integer.value[0] =
901 loopback->setup[kcontrol->id.subdevice]
902 [kcontrol->id.device].channels;
903 return 0;
904 }
905
906 static struct snd_kcontrol_new loopback_controls[] __devinitdata = {
907 {
908 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
909 .name = "PCM Rate Shift 100000",
910 .info = loopback_rate_shift_info,
911 .get = loopback_rate_shift_get,
912 .put = loopback_rate_shift_put,
913 },
914 {
915 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
916 .name = "PCM Notify",
917 .info = snd_ctl_boolean_mono_info,
918 .get = loopback_notify_get,
919 .put = loopback_notify_put,
920 },
921 #define ACTIVE_IDX 2
922 {
923 .access = SNDRV_CTL_ELEM_ACCESS_READ,
924 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
925 .name = "PCM Slave Active",
926 .info = snd_ctl_boolean_mono_info,
927 .get = loopback_active_get,
928 },
929 #define FORMAT_IDX 3
930 {
931 .access = SNDRV_CTL_ELEM_ACCESS_READ,
932 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
933 .name = "PCM Slave Format",
934 .info = loopback_format_info,
935 .get = loopback_format_get
936 },
937 #define RATE_IDX 4
938 {
939 .access = SNDRV_CTL_ELEM_ACCESS_READ,
940 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
941 .name = "PCM Slave Rate",
942 .info = loopback_rate_info,
943 .get = loopback_rate_get
944 },
945 #define CHANNELS_IDX 5
946 {
947 .access = SNDRV_CTL_ELEM_ACCESS_READ,
948 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
949 .name = "PCM Slave Channels",
950 .info = loopback_channels_info,
951 .get = loopback_channels_get
952 }
953 };
954
955 static int __devinit loopback_mixer_new(struct loopback *loopback, int notify)
956 {
957 struct snd_card *card = loopback->card;
958 struct snd_pcm *pcm;
959 struct snd_kcontrol *kctl;
960 struct loopback_setup *setup;
961 int err, dev, substr, substr_count, idx;
962
963 strcpy(card->mixername, "Loopback Mixer");
964 for (dev = 0; dev < 2; dev++) {
965 pcm = loopback->pcm[dev];
966 substr_count =
967 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count;
968 for (substr = 0; substr < substr_count; substr++) {
969 setup = &loopback->setup[substr][dev];
970 setup->notify = notify;
971 setup->rate_shift = NO_PITCH;
972 setup->format = SNDRV_PCM_FORMAT_S16_LE;
973 setup->rate = 48000;
974 setup->channels = 2;
975 for (idx = 0; idx < ARRAY_SIZE(loopback_controls);
976 idx++) {
977 kctl = snd_ctl_new1(&loopback_controls[idx],
978 loopback);
979 if (!kctl)
980 return -ENOMEM;
981 kctl->id.device = dev;
982 kctl->id.subdevice = substr;
983 switch (idx) {
984 case ACTIVE_IDX:
985 setup->active_id = kctl->id;
986 break;
987 case FORMAT_IDX:
988 setup->format_id = kctl->id;
989 break;
990 case RATE_IDX:
991 setup->rate_id = kctl->id;
992 break;
993 case CHANNELS_IDX:
994 setup->channels_id = kctl->id;
995 break;
996 default:
997 break;
998 }
999 err = snd_ctl_add(card, kctl);
1000 if (err < 0)
1001 return err;
1002 }
1003 }
1004 }
1005 return 0;
1006 }
1007
1008 static int __devinit loopback_probe(struct platform_device *devptr)
1009 {
1010 struct snd_card *card;
1011 struct loopback *loopback;
1012 int dev = devptr->id;
1013 int err;
1014
1015 err = snd_card_create(index[dev], id[dev], THIS_MODULE,
1016 sizeof(struct loopback), &card);
1017 if (err < 0)
1018 return err;
1019 loopback = card->private_data;
1020
1021 if (pcm_substreams[dev] < 1)
1022 pcm_substreams[dev] = 1;
1023 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1024 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1025
1026 loopback->card = card;
1027 mutex_init(&loopback->cable_lock);
1028
1029 err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]);
1030 if (err < 0)
1031 goto __nodev;
1032 err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]);
1033 if (err < 0)
1034 goto __nodev;
1035 err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0);
1036 if (err < 0)
1037 goto __nodev;
1038 strcpy(card->driver, "Loopback");
1039 strcpy(card->shortname, "Loopback");
1040 sprintf(card->longname, "Loopback %i", dev + 1);
1041 err = snd_card_register(card);
1042 if (!err) {
1043 platform_set_drvdata(devptr, card);
1044 return 0;
1045 }
1046 __nodev:
1047 snd_card_free(card);
1048 return err;
1049 }
1050
1051 static int __devexit loopback_remove(struct platform_device *devptr)
1052 {
1053 snd_card_free(platform_get_drvdata(devptr));
1054 platform_set_drvdata(devptr, NULL);
1055 return 0;
1056 }
1057
1058 #ifdef CONFIG_PM
1059 static int loopback_suspend(struct platform_device *pdev,
1060 pm_message_t state)
1061 {
1062 struct snd_card *card = platform_get_drvdata(pdev);
1063 struct loopback *loopback = card->private_data;
1064
1065 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1066
1067 snd_pcm_suspend_all(loopback->pcm[0]);
1068 snd_pcm_suspend_all(loopback->pcm[1]);
1069 return 0;
1070 }
1071
1072 static int loopback_resume(struct platform_device *pdev)
1073 {
1074 struct snd_card *card = platform_get_drvdata(pdev);
1075
1076 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1077 return 0;
1078 }
1079 #endif
1080
1081 #define SND_LOOPBACK_DRIVER "snd_aloop"
1082
1083 static struct platform_driver loopback_driver = {
1084 .probe = loopback_probe,
1085 .remove = __devexit_p(loopback_remove),
1086 #ifdef CONFIG_PM
1087 .suspend = loopback_suspend,
1088 .resume = loopback_resume,
1089 #endif
1090 .driver = {
1091 .name = SND_LOOPBACK_DRIVER
1092 },
1093 };
1094
1095 static void loopback_unregister_all(void)
1096 {
1097 int i;
1098
1099 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1100 platform_device_unregister(devices[i]);
1101 platform_driver_unregister(&loopback_driver);
1102 }
1103
1104 static int __init alsa_card_loopback_init(void)
1105 {
1106 int i, err, cards;
1107
1108 err = platform_driver_register(&loopback_driver);
1109 if (err < 0)
1110 return err;
1111
1112
1113 cards = 0;
1114 for (i = 0; i < SNDRV_CARDS; i++) {
1115 struct platform_device *device;
1116 if (!enable[i])
1117 continue;
1118 device = platform_device_register_simple(SND_LOOPBACK_DRIVER,
1119 i, NULL, 0);
1120 if (IS_ERR(device))
1121 continue;
1122 if (!platform_get_drvdata(device)) {
1123 platform_device_unregister(device);
1124 continue;
1125 }
1126 devices[i] = device;
1127 cards++;
1128 }
1129 if (!cards) {
1130 #ifdef MODULE
1131 printk(KERN_ERR "aloop: No loopback enabled\n");
1132 #endif
1133 loopback_unregister_all();
1134 return -ENODEV;
1135 }
1136 return 0;
1137 }
1138
1139 static void __exit alsa_card_loopback_exit(void)
1140 {
1141 loopback_unregister_all();
1142 }
1143
1144 module_init(alsa_card_loopback_init)
1145 module_exit(alsa_card_loopback_exit)
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