Root/
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/module.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/info.h> |
43 | #include <sound/initval.h> |
44 | |
45 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); |
46 | MODULE_DESCRIPTION("A loopback soundcard"); |
47 | MODULE_LICENSE("GPL"); |
48 | MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}"); |
49 | |
50 | #define MAX_PCM_SUBSTREAMS 8 |
51 | |
52 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ |
53 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ |
54 | static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
55 | static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; |
56 | static int pcm_notify[SNDRV_CARDS]; |
57 | |
58 | module_param_array(index, int, NULL, 0444); |
59 | MODULE_PARM_DESC(index, "Index value for loopback soundcard."); |
60 | module_param_array(id, charp, NULL, 0444); |
61 | MODULE_PARM_DESC(id, "ID string for loopback soundcard."); |
62 | module_param_array(enable, bool, NULL, 0444); |
63 | MODULE_PARM_DESC(enable, "Enable this loopback soundcard."); |
64 | module_param_array(pcm_substreams, int, NULL, 0444); |
65 | MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver."); |
66 | module_param_array(pcm_notify, int, NULL, 0444); |
67 | MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes."); |
68 | |
69 | #define NO_PITCH 100000 |
70 | |
71 | struct loopback_pcm; |
72 | |
73 | struct loopback_cable { |
74 | spinlock_t lock; |
75 | struct loopback_pcm *streams[2]; |
76 | struct snd_pcm_hardware hw; |
77 | /* flags */ |
78 | unsigned int valid; |
79 | unsigned int running; |
80 | unsigned int pause; |
81 | }; |
82 | |
83 | struct loopback_setup { |
84 | unsigned int notify: 1; |
85 | unsigned int rate_shift; |
86 | unsigned int format; |
87 | unsigned int rate; |
88 | unsigned int channels; |
89 | struct snd_ctl_elem_id active_id; |
90 | struct snd_ctl_elem_id format_id; |
91 | struct snd_ctl_elem_id rate_id; |
92 | struct snd_ctl_elem_id channels_id; |
93 | }; |
94 | |
95 | struct loopback { |
96 | struct snd_card *card; |
97 | struct mutex cable_lock; |
98 | struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2]; |
99 | struct snd_pcm *pcm[2]; |
100 | struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2]; |
101 | }; |
102 | |
103 | struct loopback_pcm { |
104 | struct loopback *loopback; |
105 | struct snd_pcm_substream *substream; |
106 | struct loopback_cable *cable; |
107 | unsigned int pcm_buffer_size; |
108 | unsigned int buf_pos; /* position in buffer */ |
109 | unsigned int silent_size; |
110 | /* PCM parameters */ |
111 | unsigned int pcm_period_size; |
112 | unsigned int pcm_bps; /* bytes per second */ |
113 | unsigned int pcm_salign; /* bytes per sample * channels */ |
114 | unsigned int pcm_rate_shift; /* rate shift value */ |
115 | /* flags */ |
116 | unsigned int period_update_pending :1; |
117 | /* timer stuff */ |
118 | unsigned int irq_pos; /* fractional IRQ position */ |
119 | unsigned int period_size_frac; |
120 | unsigned int last_drift; |
121 | unsigned long last_jiffies; |
122 | struct timer_list timer; |
123 | }; |
124 | |
125 | static struct platform_device *devices[SNDRV_CARDS]; |
126 | |
127 | static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) |
128 | { |
129 | if (dpcm->pcm_rate_shift == NO_PITCH) { |
130 | x /= HZ; |
131 | } else { |
132 | x = div_u64(NO_PITCH * (unsigned long long)x, |
133 | HZ * (unsigned long long)dpcm->pcm_rate_shift); |
134 | } |
135 | return x - (x % dpcm->pcm_salign); |
136 | } |
137 | |
138 | static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) |
139 | { |
140 | if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ |
141 | return x * HZ; |
142 | } else { |
143 | x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, |
144 | NO_PITCH); |
145 | } |
146 | return x; |
147 | } |
148 | |
149 | static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) |
150 | { |
151 | int device = dpcm->substream->pstr->pcm->device; |
152 | |
153 | if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
154 | device ^= 1; |
155 | return &dpcm->loopback->setup[dpcm->substream->number][device]; |
156 | } |
157 | |
158 | static inline unsigned int get_notify(struct loopback_pcm *dpcm) |
159 | { |
160 | return get_setup(dpcm)->notify; |
161 | } |
162 | |
163 | static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) |
164 | { |
165 | return get_setup(dpcm)->rate_shift; |
166 | } |
167 | |
168 | /* call in cable->lock */ |
169 | static void loopback_timer_start(struct loopback_pcm *dpcm) |
170 | { |
171 | unsigned long tick; |
172 | unsigned int rate_shift = get_rate_shift(dpcm); |
173 | |
174 | if (rate_shift != dpcm->pcm_rate_shift) { |
175 | dpcm->pcm_rate_shift = rate_shift; |
176 | dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); |
177 | } |
178 | if (dpcm->period_size_frac <= dpcm->irq_pos) { |
179 | dpcm->irq_pos %= dpcm->period_size_frac; |
180 | dpcm->period_update_pending = 1; |
181 | } |
182 | tick = dpcm->period_size_frac - dpcm->irq_pos; |
183 | tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; |
184 | dpcm->timer.expires = jiffies + tick; |
185 | add_timer(&dpcm->timer); |
186 | } |
187 | |
188 | /* call in cable->lock */ |
189 | static inline void loopback_timer_stop(struct loopback_pcm *dpcm) |
190 | { |
191 | del_timer(&dpcm->timer); |
192 | dpcm->timer.expires = 0; |
193 | } |
194 | |
195 | #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) |
196 | #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) |
197 | #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) |
198 | |
199 | static int loopback_check_format(struct loopback_cable *cable, int stream) |
200 | { |
201 | struct snd_pcm_runtime *runtime, *cruntime; |
202 | struct loopback_setup *setup; |
203 | struct snd_card *card; |
204 | int check; |
205 | |
206 | if (cable->valid != CABLE_VALID_BOTH) { |
207 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) |
208 | goto __notify; |
209 | return 0; |
210 | } |
211 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> |
212 | substream->runtime; |
213 | cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> |
214 | substream->runtime; |
215 | check = runtime->format != cruntime->format || |
216 | runtime->rate != cruntime->rate || |
217 | runtime->channels != cruntime->channels; |
218 | if (!check) |
219 | return 0; |
220 | if (stream == SNDRV_PCM_STREAM_CAPTURE) { |
221 | return -EIO; |
222 | } else { |
223 | snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> |
224 | substream, SNDRV_PCM_STATE_DRAINING); |
225 | __notify: |
226 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> |
227 | substream->runtime; |
228 | setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); |
229 | card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; |
230 | if (setup->format != runtime->format) { |
231 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, |
232 | &setup->format_id); |
233 | setup->format = runtime->format; |
234 | } |
235 | if (setup->rate != runtime->rate) { |
236 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, |
237 | &setup->rate_id); |
238 | setup->rate = runtime->rate; |
239 | } |
240 | if (setup->channels != runtime->channels) { |
241 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, |
242 | &setup->channels_id); |
243 | setup->channels = runtime->channels; |
244 | } |
245 | } |
246 | return 0; |
247 | } |
248 | |
249 | static void loopback_active_notify(struct loopback_pcm *dpcm) |
250 | { |
251 | snd_ctl_notify(dpcm->loopback->card, |
252 | SNDRV_CTL_EVENT_MASK_VALUE, |
253 | &get_setup(dpcm)->active_id); |
254 | } |
255 | |
256 | static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) |
257 | { |
258 | struct snd_pcm_runtime *runtime = substream->runtime; |
259 | struct loopback_pcm *dpcm = runtime->private_data; |
260 | struct loopback_cable *cable = dpcm->cable; |
261 | int err, stream = 1 << substream->stream; |
262 | |
263 | switch (cmd) { |
264 | case SNDRV_PCM_TRIGGER_START: |
265 | err = loopback_check_format(cable, substream->stream); |
266 | if (err < 0) |
267 | return err; |
268 | dpcm->last_jiffies = jiffies; |
269 | dpcm->pcm_rate_shift = 0; |
270 | dpcm->last_drift = 0; |
271 | spin_lock(&cable->lock); |
272 | cable->running |= stream; |
273 | cable->pause &= ~stream; |
274 | loopback_timer_start(dpcm); |
275 | spin_unlock(&cable->lock); |
276 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
277 | loopback_active_notify(dpcm); |
278 | break; |
279 | case SNDRV_PCM_TRIGGER_STOP: |
280 | spin_lock(&cable->lock); |
281 | cable->running &= ~stream; |
282 | cable->pause &= ~stream; |
283 | loopback_timer_stop(dpcm); |
284 | spin_unlock(&cable->lock); |
285 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
286 | loopback_active_notify(dpcm); |
287 | break; |
288 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
289 | case SNDRV_PCM_TRIGGER_SUSPEND: |
290 | spin_lock(&cable->lock); |
291 | cable->pause |= stream; |
292 | loopback_timer_stop(dpcm); |
293 | spin_unlock(&cable->lock); |
294 | break; |
295 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
296 | case SNDRV_PCM_TRIGGER_RESUME: |
297 | spin_lock(&cable->lock); |
298 | dpcm->last_jiffies = jiffies; |
299 | cable->pause &= ~stream; |
300 | loopback_timer_start(dpcm); |
301 | spin_unlock(&cable->lock); |
302 | break; |
303 | default: |
304 | return -EINVAL; |
305 | } |
306 | return 0; |
307 | } |
308 | |
309 | static void params_change_substream(struct loopback_pcm *dpcm, |
310 | struct snd_pcm_runtime *runtime) |
311 | { |
312 | struct snd_pcm_runtime *dst_runtime; |
313 | |
314 | if (dpcm == NULL || dpcm->substream == NULL) |
315 | return; |
316 | dst_runtime = dpcm->substream->runtime; |
317 | if (dst_runtime == NULL) |
318 | return; |
319 | dst_runtime->hw = dpcm->cable->hw; |
320 | } |
321 | |
322 | static void params_change(struct snd_pcm_substream *substream) |
323 | { |
324 | struct snd_pcm_runtime *runtime = substream->runtime; |
325 | struct loopback_pcm *dpcm = runtime->private_data; |
326 | struct loopback_cable *cable = dpcm->cable; |
327 | |
328 | cable->hw.formats = pcm_format_to_bits(runtime->format); |
329 | cable->hw.rate_min = runtime->rate; |
330 | cable->hw.rate_max = runtime->rate; |
331 | cable->hw.channels_min = runtime->channels; |
332 | cable->hw.channels_max = runtime->channels; |
333 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK], |
334 | runtime); |
335 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE], |
336 | runtime); |
337 | } |
338 | |
339 | static int loopback_prepare(struct snd_pcm_substream *substream) |
340 | { |
341 | struct snd_pcm_runtime *runtime = substream->runtime; |
342 | struct loopback_pcm *dpcm = runtime->private_data; |
343 | struct loopback_cable *cable = dpcm->cable; |
344 | int bps, salign; |
345 | |
346 | salign = (snd_pcm_format_width(runtime->format) * |
347 | runtime->channels) / 8; |
348 | bps = salign * runtime->rate; |
349 | if (bps <= 0 || salign <= 0) |
350 | return -EINVAL; |
351 | |
352 | dpcm->buf_pos = 0; |
353 | dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); |
354 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { |
355 | /* clear capture buffer */ |
356 | dpcm->silent_size = dpcm->pcm_buffer_size; |
357 | snd_pcm_format_set_silence(runtime->format, runtime->dma_area, |
358 | runtime->buffer_size * runtime->channels); |
359 | } |
360 | |
361 | dpcm->irq_pos = 0; |
362 | dpcm->period_update_pending = 0; |
363 | dpcm->pcm_bps = bps; |
364 | dpcm->pcm_salign = salign; |
365 | dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); |
366 | |
367 | mutex_lock(&dpcm->loopback->cable_lock); |
368 | if (!(cable->valid & ~(1 << substream->stream)) || |
369 | (get_setup(dpcm)->notify && |
370 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) |
371 | params_change(substream); |
372 | cable->valid |= 1 << substream->stream; |
373 | mutex_unlock(&dpcm->loopback->cable_lock); |
374 | |
375 | return 0; |
376 | } |
377 | |
378 | static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) |
379 | { |
380 | struct snd_pcm_runtime *runtime = dpcm->substream->runtime; |
381 | char *dst = runtime->dma_area; |
382 | unsigned int dst_off = dpcm->buf_pos; |
383 | |
384 | if (dpcm->silent_size >= dpcm->pcm_buffer_size) |
385 | return; |
386 | if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) |
387 | bytes = dpcm->pcm_buffer_size - dpcm->silent_size; |
388 | |
389 | for (;;) { |
390 | unsigned int size = bytes; |
391 | if (dst_off + size > dpcm->pcm_buffer_size) |
392 | size = dpcm->pcm_buffer_size - dst_off; |
393 | snd_pcm_format_set_silence(runtime->format, dst + dst_off, |
394 | bytes_to_frames(runtime, size) * |
395 | runtime->channels); |
396 | dpcm->silent_size += size; |
397 | bytes -= size; |
398 | if (!bytes) |
399 | break; |
400 | dst_off = 0; |
401 | } |
402 | } |
403 | |
404 | static void copy_play_buf(struct loopback_pcm *play, |
405 | struct loopback_pcm *capt, |
406 | unsigned int bytes) |
407 | { |
408 | struct snd_pcm_runtime *runtime = play->substream->runtime; |
409 | char *src = runtime->dma_area; |
410 | char *dst = capt->substream->runtime->dma_area; |
411 | unsigned int src_off = play->buf_pos; |
412 | unsigned int dst_off = capt->buf_pos; |
413 | unsigned int clear_bytes = 0; |
414 | |
415 | /* check if playback is draining, trim the capture copy size |
416 | * when our pointer is at the end of playback ring buffer */ |
417 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && |
418 | snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { |
419 | snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; |
420 | appl_ptr = appl_ptr1 = runtime->control->appl_ptr; |
421 | appl_ptr1 -= appl_ptr1 % runtime->buffer_size; |
422 | appl_ptr1 += play->buf_pos / play->pcm_salign; |
423 | if (appl_ptr < appl_ptr1) |
424 | appl_ptr1 -= runtime->buffer_size; |
425 | diff = (appl_ptr - appl_ptr1) * play->pcm_salign; |
426 | if (diff < bytes) { |
427 | clear_bytes = bytes - diff; |
428 | bytes = diff; |
429 | } |
430 | } |
431 | |
432 | for (;;) { |
433 | unsigned int size = bytes; |
434 | if (src_off + size > play->pcm_buffer_size) |
435 | size = play->pcm_buffer_size - src_off; |
436 | if (dst_off + size > capt->pcm_buffer_size) |
437 | size = capt->pcm_buffer_size - dst_off; |
438 | memcpy(dst + dst_off, src + src_off, size); |
439 | capt->silent_size = 0; |
440 | bytes -= size; |
441 | if (!bytes) |
442 | break; |
443 | src_off = (src_off + size) % play->pcm_buffer_size; |
444 | dst_off = (dst_off + size) % capt->pcm_buffer_size; |
445 | } |
446 | |
447 | if (clear_bytes > 0) { |
448 | clear_capture_buf(capt, clear_bytes); |
449 | capt->silent_size = 0; |
450 | } |
451 | } |
452 | |
453 | static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, |
454 | unsigned int jiffies_delta) |
455 | { |
456 | unsigned long last_pos; |
457 | unsigned int delta; |
458 | |
459 | last_pos = byte_pos(dpcm, dpcm->irq_pos); |
460 | dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; |
461 | delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; |
462 | if (delta >= dpcm->last_drift) |
463 | delta -= dpcm->last_drift; |
464 | dpcm->last_drift = 0; |
465 | if (dpcm->irq_pos >= dpcm->period_size_frac) { |
466 | dpcm->irq_pos %= dpcm->period_size_frac; |
467 | dpcm->period_update_pending = 1; |
468 | } |
469 | return delta; |
470 | } |
471 | |
472 | static inline void bytepos_finish(struct loopback_pcm *dpcm, |
473 | unsigned int delta) |
474 | { |
475 | dpcm->buf_pos += delta; |
476 | dpcm->buf_pos %= dpcm->pcm_buffer_size; |
477 | } |
478 | |
479 | /* call in cable->lock */ |
480 | static unsigned int loopback_pos_update(struct loopback_cable *cable) |
481 | { |
482 | struct loopback_pcm *dpcm_play = |
483 | cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; |
484 | struct loopback_pcm *dpcm_capt = |
485 | cable->streams[SNDRV_PCM_STREAM_CAPTURE]; |
486 | unsigned long delta_play = 0, delta_capt = 0; |
487 | unsigned int running, count1, count2; |
488 | |
489 | running = cable->running ^ cable->pause; |
490 | if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { |
491 | delta_play = jiffies - dpcm_play->last_jiffies; |
492 | dpcm_play->last_jiffies += delta_play; |
493 | } |
494 | |
495 | if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { |
496 | delta_capt = jiffies - dpcm_capt->last_jiffies; |
497 | dpcm_capt->last_jiffies += delta_capt; |
498 | } |
499 | |
500 | if (delta_play == 0 && delta_capt == 0) |
501 | goto unlock; |
502 | |
503 | if (delta_play > delta_capt) { |
504 | count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); |
505 | bytepos_finish(dpcm_play, count1); |
506 | delta_play = delta_capt; |
507 | } else if (delta_play < delta_capt) { |
508 | count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); |
509 | clear_capture_buf(dpcm_capt, count1); |
510 | bytepos_finish(dpcm_capt, count1); |
511 | delta_capt = delta_play; |
512 | } |
513 | |
514 | if (delta_play == 0 && delta_capt == 0) |
515 | goto unlock; |
516 | |
517 | /* note delta_capt == delta_play at this moment */ |
518 | count1 = bytepos_delta(dpcm_play, delta_play); |
519 | count2 = bytepos_delta(dpcm_capt, delta_capt); |
520 | if (count1 < count2) { |
521 | dpcm_capt->last_drift = count2 - count1; |
522 | count1 = count2; |
523 | } else if (count1 > count2) { |
524 | dpcm_play->last_drift = count1 - count2; |
525 | } |
526 | copy_play_buf(dpcm_play, dpcm_capt, count1); |
527 | bytepos_finish(dpcm_play, count1); |
528 | bytepos_finish(dpcm_capt, count1); |
529 | unlock: |
530 | return running; |
531 | } |
532 | |
533 | static void loopback_timer_function(unsigned long data) |
534 | { |
535 | struct loopback_pcm *dpcm = (struct loopback_pcm *)data; |
536 | unsigned long flags; |
537 | |
538 | spin_lock_irqsave(&dpcm->cable->lock, flags); |
539 | if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) { |
540 | loopback_timer_start(dpcm); |
541 | if (dpcm->period_update_pending) { |
542 | dpcm->period_update_pending = 0; |
543 | spin_unlock_irqrestore(&dpcm->cable->lock, flags); |
544 | /* need to unlock before calling below */ |
545 | snd_pcm_period_elapsed(dpcm->substream); |
546 | return; |
547 | } |
548 | } |
549 | spin_unlock_irqrestore(&dpcm->cable->lock, flags); |
550 | } |
551 | |
552 | static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) |
553 | { |
554 | struct snd_pcm_runtime *runtime = substream->runtime; |
555 | struct loopback_pcm *dpcm = runtime->private_data; |
556 | snd_pcm_uframes_t pos; |
557 | |
558 | spin_lock(&dpcm->cable->lock); |
559 | loopback_pos_update(dpcm->cable); |
560 | pos = dpcm->buf_pos; |
561 | spin_unlock(&dpcm->cable->lock); |
562 | return bytes_to_frames(runtime, pos); |
563 | } |
564 | |
565 | static struct snd_pcm_hardware loopback_pcm_hardware = |
566 | { |
567 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | |
568 | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | |
569 | SNDRV_PCM_INFO_RESUME), |
570 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | |
571 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | |
572 | SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), |
573 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, |
574 | .rate_min = 8000, |
575 | .rate_max = 192000, |
576 | .channels_min = 1, |
577 | .channels_max = 32, |
578 | .buffer_bytes_max = 2 * 1024 * 1024, |
579 | .period_bytes_min = 64, |
580 | /* note check overflow in frac_pos() using pcm_rate_shift before |
581 | changing period_bytes_max value */ |
582 | .period_bytes_max = 1024 * 1024, |
583 | .periods_min = 1, |
584 | .periods_max = 1024, |
585 | .fifo_size = 0, |
586 | }; |
587 | |
588 | static void loopback_runtime_free(struct snd_pcm_runtime *runtime) |
589 | { |
590 | struct loopback_pcm *dpcm = runtime->private_data; |
591 | kfree(dpcm); |
592 | } |
593 | |
594 | static int loopback_hw_params(struct snd_pcm_substream *substream, |
595 | struct snd_pcm_hw_params *params) |
596 | { |
597 | return snd_pcm_lib_alloc_vmalloc_buffer(substream, |
598 | params_buffer_bytes(params)); |
599 | } |
600 | |
601 | static int loopback_hw_free(struct snd_pcm_substream *substream) |
602 | { |
603 | struct snd_pcm_runtime *runtime = substream->runtime; |
604 | struct loopback_pcm *dpcm = runtime->private_data; |
605 | struct loopback_cable *cable = dpcm->cable; |
606 | |
607 | mutex_lock(&dpcm->loopback->cable_lock); |
608 | cable->valid &= ~(1 << substream->stream); |
609 | mutex_unlock(&dpcm->loopback->cable_lock); |
610 | return snd_pcm_lib_free_vmalloc_buffer(substream); |
611 | } |
612 | |
613 | static unsigned int get_cable_index(struct snd_pcm_substream *substream) |
614 | { |
615 | if (!substream->pcm->device) |
616 | return substream->stream; |
617 | else |
618 | return !substream->stream; |
619 | } |
620 | |
621 | static int rule_format(struct snd_pcm_hw_params *params, |
622 | struct snd_pcm_hw_rule *rule) |
623 | { |
624 | |
625 | struct snd_pcm_hardware *hw = rule->private; |
626 | struct snd_mask *maskp = hw_param_mask(params, rule->var); |
627 | |
628 | maskp->bits[0] &= (u_int32_t)hw->formats; |
629 | maskp->bits[1] &= (u_int32_t)(hw->formats >> 32); |
630 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ |
631 | if (! maskp->bits[0] && ! maskp->bits[1]) |
632 | return -EINVAL; |
633 | return 0; |
634 | } |
635 | |
636 | static int rule_rate(struct snd_pcm_hw_params *params, |
637 | struct snd_pcm_hw_rule *rule) |
638 | { |
639 | struct snd_pcm_hardware *hw = rule->private; |
640 | struct snd_interval t; |
641 | |
642 | t.min = hw->rate_min; |
643 | t.max = hw->rate_max; |
644 | t.openmin = t.openmax = 0; |
645 | t.integer = 0; |
646 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); |
647 | } |
648 | |
649 | static int rule_channels(struct snd_pcm_hw_params *params, |
650 | struct snd_pcm_hw_rule *rule) |
651 | { |
652 | struct snd_pcm_hardware *hw = rule->private; |
653 | struct snd_interval t; |
654 | |
655 | t.min = hw->channels_min; |
656 | t.max = hw->channels_max; |
657 | t.openmin = t.openmax = 0; |
658 | t.integer = 0; |
659 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); |
660 | } |
661 | |
662 | static int loopback_open(struct snd_pcm_substream *substream) |
663 | { |
664 | struct snd_pcm_runtime *runtime = substream->runtime; |
665 | struct loopback *loopback = substream->private_data; |
666 | struct loopback_pcm *dpcm; |
667 | struct loopback_cable *cable; |
668 | int err = 0; |
669 | int dev = get_cable_index(substream); |
670 | |
671 | mutex_lock(&loopback->cable_lock); |
672 | dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); |
673 | if (!dpcm) { |
674 | err = -ENOMEM; |
675 | goto unlock; |
676 | } |
677 | dpcm->loopback = loopback; |
678 | dpcm->substream = substream; |
679 | setup_timer(&dpcm->timer, loopback_timer_function, |
680 | (unsigned long)dpcm); |
681 | |
682 | cable = loopback->cables[substream->number][dev]; |
683 | if (!cable) { |
684 | cable = kzalloc(sizeof(*cable), GFP_KERNEL); |
685 | if (!cable) { |
686 | kfree(dpcm); |
687 | err = -ENOMEM; |
688 | goto unlock; |
689 | } |
690 | spin_lock_init(&cable->lock); |
691 | cable->hw = loopback_pcm_hardware; |
692 | loopback->cables[substream->number][dev] = cable; |
693 | } |
694 | dpcm->cable = cable; |
695 | cable->streams[substream->stream] = dpcm; |
696 | |
697 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
698 | |
699 | /* use dynamic rules based on actual runtime->hw values */ |
700 | /* note that the default rules created in the PCM midlevel code */ |
701 | /* are cached -> they do not reflect the actual state */ |
702 | err = snd_pcm_hw_rule_add(runtime, 0, |
703 | SNDRV_PCM_HW_PARAM_FORMAT, |
704 | rule_format, &runtime->hw, |
705 | SNDRV_PCM_HW_PARAM_FORMAT, -1); |
706 | if (err < 0) |
707 | goto unlock; |
708 | err = snd_pcm_hw_rule_add(runtime, 0, |
709 | SNDRV_PCM_HW_PARAM_RATE, |
710 | rule_rate, &runtime->hw, |
711 | SNDRV_PCM_HW_PARAM_RATE, -1); |
712 | if (err < 0) |
713 | goto unlock; |
714 | err = snd_pcm_hw_rule_add(runtime, 0, |
715 | SNDRV_PCM_HW_PARAM_CHANNELS, |
716 | rule_channels, &runtime->hw, |
717 | SNDRV_PCM_HW_PARAM_CHANNELS, -1); |
718 | if (err < 0) |
719 | goto unlock; |
720 | |
721 | runtime->private_data = dpcm; |
722 | runtime->private_free = loopback_runtime_free; |
723 | if (get_notify(dpcm)) |
724 | runtime->hw = loopback_pcm_hardware; |
725 | else |
726 | runtime->hw = cable->hw; |
727 | unlock: |
728 | mutex_unlock(&loopback->cable_lock); |
729 | return err; |
730 | } |
731 | |
732 | static int loopback_close(struct snd_pcm_substream *substream) |
733 | { |
734 | struct loopback *loopback = substream->private_data; |
735 | struct loopback_pcm *dpcm = substream->runtime->private_data; |
736 | struct loopback_cable *cable; |
737 | int dev = get_cable_index(substream); |
738 | |
739 | loopback_timer_stop(dpcm); |
740 | mutex_lock(&loopback->cable_lock); |
741 | cable = loopback->cables[substream->number][dev]; |
742 | if (cable->streams[!substream->stream]) { |
743 | /* other stream is still alive */ |
744 | cable->streams[substream->stream] = NULL; |
745 | } else { |
746 | /* free the cable */ |
747 | loopback->cables[substream->number][dev] = NULL; |
748 | kfree(cable); |
749 | } |
750 | mutex_unlock(&loopback->cable_lock); |
751 | return 0; |
752 | } |
753 | |
754 | static struct snd_pcm_ops loopback_playback_ops = { |
755 | .open = loopback_open, |
756 | .close = loopback_close, |
757 | .ioctl = snd_pcm_lib_ioctl, |
758 | .hw_params = loopback_hw_params, |
759 | .hw_free = loopback_hw_free, |
760 | .prepare = loopback_prepare, |
761 | .trigger = loopback_trigger, |
762 | .pointer = loopback_pointer, |
763 | .page = snd_pcm_lib_get_vmalloc_page, |
764 | .mmap = snd_pcm_lib_mmap_vmalloc, |
765 | }; |
766 | |
767 | static struct snd_pcm_ops loopback_capture_ops = { |
768 | .open = loopback_open, |
769 | .close = loopback_close, |
770 | .ioctl = snd_pcm_lib_ioctl, |
771 | .hw_params = loopback_hw_params, |
772 | .hw_free = loopback_hw_free, |
773 | .prepare = loopback_prepare, |
774 | .trigger = loopback_trigger, |
775 | .pointer = loopback_pointer, |
776 | .page = snd_pcm_lib_get_vmalloc_page, |
777 | .mmap = snd_pcm_lib_mmap_vmalloc, |
778 | }; |
779 | |
780 | static int loopback_pcm_new(struct loopback *loopback, |
781 | int device, int substreams) |
782 | { |
783 | struct snd_pcm *pcm; |
784 | int err; |
785 | |
786 | err = snd_pcm_new(loopback->card, "Loopback PCM", device, |
787 | substreams, substreams, &pcm); |
788 | if (err < 0) |
789 | return err; |
790 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); |
791 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); |
792 | |
793 | pcm->private_data = loopback; |
794 | pcm->info_flags = 0; |
795 | strcpy(pcm->name, "Loopback PCM"); |
796 | |
797 | loopback->pcm[device] = pcm; |
798 | return 0; |
799 | } |
800 | |
801 | static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, |
802 | struct snd_ctl_elem_info *uinfo) |
803 | { |
804 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
805 | uinfo->count = 1; |
806 | uinfo->value.integer.min = 80000; |
807 | uinfo->value.integer.max = 120000; |
808 | uinfo->value.integer.step = 1; |
809 | return 0; |
810 | } |
811 | |
812 | static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, |
813 | struct snd_ctl_elem_value *ucontrol) |
814 | { |
815 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
816 | |
817 | ucontrol->value.integer.value[0] = |
818 | loopback->setup[kcontrol->id.subdevice] |
819 | [kcontrol->id.device].rate_shift; |
820 | return 0; |
821 | } |
822 | |
823 | static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, |
824 | struct snd_ctl_elem_value *ucontrol) |
825 | { |
826 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
827 | unsigned int val; |
828 | int change = 0; |
829 | |
830 | val = ucontrol->value.integer.value[0]; |
831 | if (val < 80000) |
832 | val = 80000; |
833 | if (val > 120000) |
834 | val = 120000; |
835 | mutex_lock(&loopback->cable_lock); |
836 | if (val != loopback->setup[kcontrol->id.subdevice] |
837 | [kcontrol->id.device].rate_shift) { |
838 | loopback->setup[kcontrol->id.subdevice] |
839 | [kcontrol->id.device].rate_shift = val; |
840 | change = 1; |
841 | } |
842 | mutex_unlock(&loopback->cable_lock); |
843 | return change; |
844 | } |
845 | |
846 | static int loopback_notify_get(struct snd_kcontrol *kcontrol, |
847 | struct snd_ctl_elem_value *ucontrol) |
848 | { |
849 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
850 | |
851 | ucontrol->value.integer.value[0] = |
852 | loopback->setup[kcontrol->id.subdevice] |
853 | [kcontrol->id.device].notify; |
854 | return 0; |
855 | } |
856 | |
857 | static int loopback_notify_put(struct snd_kcontrol *kcontrol, |
858 | struct snd_ctl_elem_value *ucontrol) |
859 | { |
860 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
861 | unsigned int val; |
862 | int change = 0; |
863 | |
864 | val = ucontrol->value.integer.value[0] ? 1 : 0; |
865 | if (val != loopback->setup[kcontrol->id.subdevice] |
866 | [kcontrol->id.device].notify) { |
867 | loopback->setup[kcontrol->id.subdevice] |
868 | [kcontrol->id.device].notify = val; |
869 | change = 1; |
870 | } |
871 | return change; |
872 | } |
873 | |
874 | static int loopback_active_get(struct snd_kcontrol *kcontrol, |
875 | struct snd_ctl_elem_value *ucontrol) |
876 | { |
877 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
878 | struct loopback_cable *cable = loopback->cables |
879 | [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; |
880 | unsigned int val = 0; |
881 | |
882 | if (cable != NULL) |
883 | val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? |
884 | 1 : 0; |
885 | ucontrol->value.integer.value[0] = val; |
886 | return 0; |
887 | } |
888 | |
889 | static int loopback_format_info(struct snd_kcontrol *kcontrol, |
890 | struct snd_ctl_elem_info *uinfo) |
891 | { |
892 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
893 | uinfo->count = 1; |
894 | uinfo->value.integer.min = 0; |
895 | uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; |
896 | uinfo->value.integer.step = 1; |
897 | return 0; |
898 | } |
899 | |
900 | static int loopback_format_get(struct snd_kcontrol *kcontrol, |
901 | struct snd_ctl_elem_value *ucontrol) |
902 | { |
903 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
904 | |
905 | ucontrol->value.integer.value[0] = |
906 | loopback->setup[kcontrol->id.subdevice] |
907 | [kcontrol->id.device].format; |
908 | return 0; |
909 | } |
910 | |
911 | static int loopback_rate_info(struct snd_kcontrol *kcontrol, |
912 | struct snd_ctl_elem_info *uinfo) |
913 | { |
914 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
915 | uinfo->count = 1; |
916 | uinfo->value.integer.min = 0; |
917 | uinfo->value.integer.max = 192000; |
918 | uinfo->value.integer.step = 1; |
919 | return 0; |
920 | } |
921 | |
922 | static int loopback_rate_get(struct snd_kcontrol *kcontrol, |
923 | struct snd_ctl_elem_value *ucontrol) |
924 | { |
925 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
926 | |
927 | ucontrol->value.integer.value[0] = |
928 | loopback->setup[kcontrol->id.subdevice] |
929 | [kcontrol->id.device].rate; |
930 | return 0; |
931 | } |
932 | |
933 | static int loopback_channels_info(struct snd_kcontrol *kcontrol, |
934 | struct snd_ctl_elem_info *uinfo) |
935 | { |
936 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
937 | uinfo->count = 1; |
938 | uinfo->value.integer.min = 1; |
939 | uinfo->value.integer.max = 1024; |
940 | uinfo->value.integer.step = 1; |
941 | return 0; |
942 | } |
943 | |
944 | static int loopback_channels_get(struct snd_kcontrol *kcontrol, |
945 | struct snd_ctl_elem_value *ucontrol) |
946 | { |
947 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
948 | |
949 | ucontrol->value.integer.value[0] = |
950 | loopback->setup[kcontrol->id.subdevice] |
951 | [kcontrol->id.device].channels; |
952 | return 0; |
953 | } |
954 | |
955 | static struct snd_kcontrol_new loopback_controls[] = { |
956 | { |
957 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, |
958 | .name = "PCM Rate Shift 100000", |
959 | .info = loopback_rate_shift_info, |
960 | .get = loopback_rate_shift_get, |
961 | .put = loopback_rate_shift_put, |
962 | }, |
963 | { |
964 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, |
965 | .name = "PCM Notify", |
966 | .info = snd_ctl_boolean_mono_info, |
967 | .get = loopback_notify_get, |
968 | .put = loopback_notify_put, |
969 | }, |
970 | #define ACTIVE_IDX 2 |
971 | { |
972 | .access = SNDRV_CTL_ELEM_ACCESS_READ, |
973 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, |
974 | .name = "PCM Slave Active", |
975 | .info = snd_ctl_boolean_mono_info, |
976 | .get = loopback_active_get, |
977 | }, |
978 | #define FORMAT_IDX 3 |
979 | { |
980 | .access = SNDRV_CTL_ELEM_ACCESS_READ, |
981 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, |
982 | .name = "PCM Slave Format", |
983 | .info = loopback_format_info, |
984 | .get = loopback_format_get |
985 | }, |
986 | #define RATE_IDX 4 |
987 | { |
988 | .access = SNDRV_CTL_ELEM_ACCESS_READ, |
989 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, |
990 | .name = "PCM Slave Rate", |
991 | .info = loopback_rate_info, |
992 | .get = loopback_rate_get |
993 | }, |
994 | #define CHANNELS_IDX 5 |
995 | { |
996 | .access = SNDRV_CTL_ELEM_ACCESS_READ, |
997 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, |
998 | .name = "PCM Slave Channels", |
999 | .info = loopback_channels_info, |
1000 | .get = loopback_channels_get |
1001 | } |
1002 | }; |
1003 | |
1004 | static int loopback_mixer_new(struct loopback *loopback, int notify) |
1005 | { |
1006 | struct snd_card *card = loopback->card; |
1007 | struct snd_pcm *pcm; |
1008 | struct snd_kcontrol *kctl; |
1009 | struct loopback_setup *setup; |
1010 | int err, dev, substr, substr_count, idx; |
1011 | |
1012 | strcpy(card->mixername, "Loopback Mixer"); |
1013 | for (dev = 0; dev < 2; dev++) { |
1014 | pcm = loopback->pcm[dev]; |
1015 | substr_count = |
1016 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; |
1017 | for (substr = 0; substr < substr_count; substr++) { |
1018 | setup = &loopback->setup[substr][dev]; |
1019 | setup->notify = notify; |
1020 | setup->rate_shift = NO_PITCH; |
1021 | setup->format = SNDRV_PCM_FORMAT_S16_LE; |
1022 | setup->rate = 48000; |
1023 | setup->channels = 2; |
1024 | for (idx = 0; idx < ARRAY_SIZE(loopback_controls); |
1025 | idx++) { |
1026 | kctl = snd_ctl_new1(&loopback_controls[idx], |
1027 | loopback); |
1028 | if (!kctl) |
1029 | return -ENOMEM; |
1030 | kctl->id.device = dev; |
1031 | kctl->id.subdevice = substr; |
1032 | switch (idx) { |
1033 | case ACTIVE_IDX: |
1034 | setup->active_id = kctl->id; |
1035 | break; |
1036 | case FORMAT_IDX: |
1037 | setup->format_id = kctl->id; |
1038 | break; |
1039 | case RATE_IDX: |
1040 | setup->rate_id = kctl->id; |
1041 | break; |
1042 | case CHANNELS_IDX: |
1043 | setup->channels_id = kctl->id; |
1044 | break; |
1045 | default: |
1046 | break; |
1047 | } |
1048 | err = snd_ctl_add(card, kctl); |
1049 | if (err < 0) |
1050 | return err; |
1051 | } |
1052 | } |
1053 | } |
1054 | return 0; |
1055 | } |
1056 | |
1057 | #ifdef CONFIG_PROC_FS |
1058 | |
1059 | static void print_dpcm_info(struct snd_info_buffer *buffer, |
1060 | struct loopback_pcm *dpcm, |
1061 | const char *id) |
1062 | { |
1063 | snd_iprintf(buffer, " %s\n", id); |
1064 | if (dpcm == NULL) { |
1065 | snd_iprintf(buffer, " inactive\n"); |
1066 | return; |
1067 | } |
1068 | snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); |
1069 | snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); |
1070 | snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); |
1071 | snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); |
1072 | snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); |
1073 | snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); |
1074 | snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); |
1075 | snd_iprintf(buffer, " update_pending:\t%u\n", |
1076 | dpcm->period_update_pending); |
1077 | snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); |
1078 | snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); |
1079 | snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", |
1080 | dpcm->last_jiffies, jiffies); |
1081 | snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); |
1082 | } |
1083 | |
1084 | static void print_substream_info(struct snd_info_buffer *buffer, |
1085 | struct loopback *loopback, |
1086 | int sub, |
1087 | int num) |
1088 | { |
1089 | struct loopback_cable *cable = loopback->cables[sub][num]; |
1090 | |
1091 | snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); |
1092 | if (cable == NULL) { |
1093 | snd_iprintf(buffer, " inactive\n"); |
1094 | return; |
1095 | } |
1096 | snd_iprintf(buffer, " valid: %u\n", cable->valid); |
1097 | snd_iprintf(buffer, " running: %u\n", cable->running); |
1098 | snd_iprintf(buffer, " pause: %u\n", cable->pause); |
1099 | print_dpcm_info(buffer, cable->streams[0], "Playback"); |
1100 | print_dpcm_info(buffer, cable->streams[1], "Capture"); |
1101 | } |
1102 | |
1103 | static void print_cable_info(struct snd_info_entry *entry, |
1104 | struct snd_info_buffer *buffer) |
1105 | { |
1106 | struct loopback *loopback = entry->private_data; |
1107 | int sub, num; |
1108 | |
1109 | mutex_lock(&loopback->cable_lock); |
1110 | num = entry->name[strlen(entry->name)-1]; |
1111 | num = num == '0' ? 0 : 1; |
1112 | for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) |
1113 | print_substream_info(buffer, loopback, sub, num); |
1114 | mutex_unlock(&loopback->cable_lock); |
1115 | } |
1116 | |
1117 | static int loopback_proc_new(struct loopback *loopback, int cidx) |
1118 | { |
1119 | char name[32]; |
1120 | struct snd_info_entry *entry; |
1121 | int err; |
1122 | |
1123 | snprintf(name, sizeof(name), "cable#%d", cidx); |
1124 | err = snd_card_proc_new(loopback->card, name, &entry); |
1125 | if (err < 0) |
1126 | return err; |
1127 | |
1128 | snd_info_set_text_ops(entry, loopback, print_cable_info); |
1129 | return 0; |
1130 | } |
1131 | |
1132 | #else /* !CONFIG_PROC_FS */ |
1133 | |
1134 | #define loopback_proc_new(loopback, cidx) do { } while (0) |
1135 | |
1136 | #endif |
1137 | |
1138 | static int loopback_probe(struct platform_device *devptr) |
1139 | { |
1140 | struct snd_card *card; |
1141 | struct loopback *loopback; |
1142 | int dev = devptr->id; |
1143 | int err; |
1144 | |
1145 | err = snd_card_create(index[dev], id[dev], THIS_MODULE, |
1146 | sizeof(struct loopback), &card); |
1147 | if (err < 0) |
1148 | return err; |
1149 | loopback = card->private_data; |
1150 | |
1151 | if (pcm_substreams[dev] < 1) |
1152 | pcm_substreams[dev] = 1; |
1153 | if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) |
1154 | pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; |
1155 | |
1156 | loopback->card = card; |
1157 | mutex_init(&loopback->cable_lock); |
1158 | |
1159 | err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); |
1160 | if (err < 0) |
1161 | goto __nodev; |
1162 | err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); |
1163 | if (err < 0) |
1164 | goto __nodev; |
1165 | err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); |
1166 | if (err < 0) |
1167 | goto __nodev; |
1168 | loopback_proc_new(loopback, 0); |
1169 | loopback_proc_new(loopback, 1); |
1170 | strcpy(card->driver, "Loopback"); |
1171 | strcpy(card->shortname, "Loopback"); |
1172 | sprintf(card->longname, "Loopback %i", dev + 1); |
1173 | err = snd_card_register(card); |
1174 | if (!err) { |
1175 | platform_set_drvdata(devptr, card); |
1176 | return 0; |
1177 | } |
1178 | __nodev: |
1179 | snd_card_free(card); |
1180 | return err; |
1181 | } |
1182 | |
1183 | static int loopback_remove(struct platform_device *devptr) |
1184 | { |
1185 | snd_card_free(platform_get_drvdata(devptr)); |
1186 | return 0; |
1187 | } |
1188 | |
1189 | #ifdef CONFIG_PM_SLEEP |
1190 | static int loopback_suspend(struct device *pdev) |
1191 | { |
1192 | struct snd_card *card = dev_get_drvdata(pdev); |
1193 | struct loopback *loopback = card->private_data; |
1194 | |
1195 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); |
1196 | |
1197 | snd_pcm_suspend_all(loopback->pcm[0]); |
1198 | snd_pcm_suspend_all(loopback->pcm[1]); |
1199 | return 0; |
1200 | } |
1201 | |
1202 | static int loopback_resume(struct device *pdev) |
1203 | { |
1204 | struct snd_card *card = dev_get_drvdata(pdev); |
1205 | |
1206 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
1207 | return 0; |
1208 | } |
1209 | |
1210 | static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); |
1211 | #define LOOPBACK_PM_OPS &loopback_pm |
1212 | #else |
1213 | #define LOOPBACK_PM_OPS NULL |
1214 | #endif |
1215 | |
1216 | #define SND_LOOPBACK_DRIVER "snd_aloop" |
1217 | |
1218 | static struct platform_driver loopback_driver = { |
1219 | .probe = loopback_probe, |
1220 | .remove = loopback_remove, |
1221 | .driver = { |
1222 | .name = SND_LOOPBACK_DRIVER, |
1223 | .owner = THIS_MODULE, |
1224 | .pm = LOOPBACK_PM_OPS, |
1225 | }, |
1226 | }; |
1227 | |
1228 | static void loopback_unregister_all(void) |
1229 | { |
1230 | int i; |
1231 | |
1232 | for (i = 0; i < ARRAY_SIZE(devices); ++i) |
1233 | platform_device_unregister(devices[i]); |
1234 | platform_driver_unregister(&loopback_driver); |
1235 | } |
1236 | |
1237 | static int __init alsa_card_loopback_init(void) |
1238 | { |
1239 | int i, err, cards; |
1240 | |
1241 | err = platform_driver_register(&loopback_driver); |
1242 | if (err < 0) |
1243 | return err; |
1244 | |
1245 | |
1246 | cards = 0; |
1247 | for (i = 0; i < SNDRV_CARDS; i++) { |
1248 | struct platform_device *device; |
1249 | if (!enable[i]) |
1250 | continue; |
1251 | device = platform_device_register_simple(SND_LOOPBACK_DRIVER, |
1252 | i, NULL, 0); |
1253 | if (IS_ERR(device)) |
1254 | continue; |
1255 | if (!platform_get_drvdata(device)) { |
1256 | platform_device_unregister(device); |
1257 | continue; |
1258 | } |
1259 | devices[i] = device; |
1260 | cards++; |
1261 | } |
1262 | if (!cards) { |
1263 | #ifdef MODULE |
1264 | printk(KERN_ERR "aloop: No loopback enabled\n"); |
1265 | #endif |
1266 | loopback_unregister_all(); |
1267 | return -ENODEV; |
1268 | } |
1269 | return 0; |
1270 | } |
1271 | |
1272 | static void __exit alsa_card_loopback_exit(void) |
1273 | { |
1274 | loopback_unregister_all(); |
1275 | } |
1276 | |
1277 | module_init(alsa_card_loopback_init) |
1278 | module_exit(alsa_card_loopback_exit) |
1279 |
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