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597603d6 JK |
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 | { | |
b1c73fc8 | 191 | struct snd_pcm_runtime *runtime, *cruntime; |
597603d6 JK |
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; | |
b1c73fc8 JK |
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; | |
597603d6 JK |
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 | ||
b1c73fc8 JK |
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 | ||
597603d6 JK |
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; | |
b1c73fc8 | 312 | int bps, salign; |
597603d6 JK |
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); | |
b1c73fc8 JK |
336 | if (!(cable->valid & ~(1 << substream->stream)) || |
337 | (get_setup(dpcm)->notify && | |
338 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) | |
339 | params_change(substream); | |
597603d6 JK |
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; | |
20d9a26d | 377 | char *src = runtime->dma_area; |
597603d6 JK |
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 | ||
20d9a26d | 415 | if (clear_bytes > 0) { |
597603d6 | 416 | clear_capture_buf(capt, clear_bytes); |
20d9a26d JK |
417 | capt->silent_size = 0; |
418 | } | |
597603d6 JK |
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 | ||
b1c73fc8 JK |
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 | ||
597603d6 JK |
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 | ||
b1c73fc8 JK |
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 | ||
597603d6 JK |
672 | runtime->private_data = dpcm; |
673 | runtime->private_free = loopback_runtime_free; | |
b1c73fc8 | 674 | if (get_notify(dpcm)) |
597603d6 | 675 | runtime->hw = loopback_pcm_hardware; |
b1c73fc8 | 676 | else |
597603d6 | 677 | runtime->hw = cable->hw; |
597603d6 JK |
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 | |
ac446fb7 | 830 | [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; |
597603d6 JK |
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] | |
1446c5fb | 902 | [kcontrol->id.device].channels; |
597603d6 JK |
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) |