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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> | |
65a77217 | 37 | #include <linux/module.h> |
597603d6 JK |
38 | #include <linux/platform_device.h> |
39 | #include <sound/core.h> | |
40 | #include <sound/control.h> | |
41 | #include <sound/pcm.h> | |
e74670b6 | 42 | #include <sound/info.h> |
597603d6 JK |
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 */ | |
a67ff6a5 | 54 | static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
597603d6 JK |
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; | |
5de9e45f | 80 | unsigned int pause; |
597603d6 JK |
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; | |
b012513c | 120 | unsigned int last_drift; |
597603d6 JK |
121 | unsigned long last_jiffies; |
122 | struct timer_list timer; | |
d4f1e48b | 123 | spinlock_t timer_lock; |
597603d6 JK |
124 | }; |
125 | ||
126 | static struct platform_device *devices[SNDRV_CARDS]; | |
127 | ||
128 | static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) | |
129 | { | |
130 | if (dpcm->pcm_rate_shift == NO_PITCH) { | |
131 | x /= HZ; | |
132 | } else { | |
133 | x = div_u64(NO_PITCH * (unsigned long long)x, | |
134 | HZ * (unsigned long long)dpcm->pcm_rate_shift); | |
135 | } | |
136 | return x - (x % dpcm->pcm_salign); | |
137 | } | |
138 | ||
139 | static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) | |
140 | { | |
141 | if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ | |
142 | return x * HZ; | |
143 | } else { | |
144 | x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, | |
145 | NO_PITCH); | |
146 | } | |
147 | return x; | |
148 | } | |
149 | ||
150 | static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) | |
151 | { | |
152 | int device = dpcm->substream->pstr->pcm->device; | |
153 | ||
154 | if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
155 | device ^= 1; | |
156 | return &dpcm->loopback->setup[dpcm->substream->number][device]; | |
157 | } | |
158 | ||
159 | static inline unsigned int get_notify(struct loopback_pcm *dpcm) | |
160 | { | |
161 | return get_setup(dpcm)->notify; | |
162 | } | |
163 | ||
164 | static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) | |
165 | { | |
166 | return get_setup(dpcm)->rate_shift; | |
167 | } | |
168 | ||
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 | ||
d4f1e48b | 174 | spin_lock(&dpcm->timer_lock); |
597603d6 JK |
175 | if (rate_shift != dpcm->pcm_rate_shift) { |
176 | dpcm->pcm_rate_shift = rate_shift; | |
177 | dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); | |
178 | } | |
0db71023 JK |
179 | if (dpcm->period_size_frac <= dpcm->irq_pos) { |
180 | dpcm->irq_pos %= dpcm->period_size_frac; | |
181 | dpcm->period_update_pending = 1; | |
182 | } | |
597603d6 JK |
183 | tick = dpcm->period_size_frac - dpcm->irq_pos; |
184 | tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; | |
185 | dpcm->timer.expires = jiffies + tick; | |
186 | add_timer(&dpcm->timer); | |
d4f1e48b | 187 | spin_unlock(&dpcm->timer_lock); |
597603d6 JK |
188 | } |
189 | ||
190 | static inline void loopback_timer_stop(struct loopback_pcm *dpcm) | |
191 | { | |
d4f1e48b | 192 | spin_lock(&dpcm->timer_lock); |
597603d6 | 193 | del_timer(&dpcm->timer); |
e74670b6 | 194 | dpcm->timer.expires = 0; |
d4f1e48b | 195 | spin_unlock(&dpcm->timer_lock); |
597603d6 JK |
196 | } |
197 | ||
198 | #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) | |
199 | #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) | |
200 | #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) | |
201 | ||
202 | static int loopback_check_format(struct loopback_cable *cable, int stream) | |
203 | { | |
b1c73fc8 | 204 | struct snd_pcm_runtime *runtime, *cruntime; |
597603d6 JK |
205 | struct loopback_setup *setup; |
206 | struct snd_card *card; | |
207 | int check; | |
208 | ||
209 | if (cable->valid != CABLE_VALID_BOTH) { | |
210 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) | |
211 | goto __notify; | |
212 | return 0; | |
213 | } | |
214 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
215 | substream->runtime; | |
b1c73fc8 JK |
216 | cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> |
217 | substream->runtime; | |
218 | check = runtime->format != cruntime->format || | |
219 | runtime->rate != cruntime->rate || | |
220 | runtime->channels != cruntime->channels; | |
597603d6 JK |
221 | if (!check) |
222 | return 0; | |
223 | if (stream == SNDRV_PCM_STREAM_CAPTURE) { | |
224 | return -EIO; | |
225 | } else { | |
226 | snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> | |
227 | substream, SNDRV_PCM_STATE_DRAINING); | |
228 | __notify: | |
229 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
230 | substream->runtime; | |
231 | setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); | |
232 | card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; | |
233 | if (setup->format != runtime->format) { | |
234 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
235 | &setup->format_id); | |
236 | setup->format = runtime->format; | |
237 | } | |
238 | if (setup->rate != runtime->rate) { | |
239 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
240 | &setup->rate_id); | |
241 | setup->rate = runtime->rate; | |
242 | } | |
243 | if (setup->channels != runtime->channels) { | |
244 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
245 | &setup->channels_id); | |
246 | setup->channels = runtime->channels; | |
247 | } | |
248 | } | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static void loopback_active_notify(struct loopback_pcm *dpcm) | |
253 | { | |
254 | snd_ctl_notify(dpcm->loopback->card, | |
255 | SNDRV_CTL_EVENT_MASK_VALUE, | |
256 | &get_setup(dpcm)->active_id); | |
257 | } | |
258 | ||
259 | static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) | |
260 | { | |
261 | struct snd_pcm_runtime *runtime = substream->runtime; | |
262 | struct loopback_pcm *dpcm = runtime->private_data; | |
263 | struct loopback_cable *cable = dpcm->cable; | |
5de9e45f | 264 | int err, stream = 1 << substream->stream; |
597603d6 JK |
265 | |
266 | switch (cmd) { | |
267 | case SNDRV_PCM_TRIGGER_START: | |
268 | err = loopback_check_format(cable, substream->stream); | |
269 | if (err < 0) | |
270 | return err; | |
271 | dpcm->last_jiffies = jiffies; | |
272 | dpcm->pcm_rate_shift = 0; | |
b012513c | 273 | dpcm->last_drift = 0; |
dd04bb12 | 274 | spin_lock(&cable->lock); |
5de9e45f JK |
275 | cable->running |= stream; |
276 | cable->pause &= ~stream; | |
dd04bb12 JK |
277 | spin_unlock(&cable->lock); |
278 | loopback_timer_start(dpcm); | |
597603d6 JK |
279 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
280 | loopback_active_notify(dpcm); | |
281 | break; | |
282 | case SNDRV_PCM_TRIGGER_STOP: | |
dd04bb12 | 283 | spin_lock(&cable->lock); |
5de9e45f JK |
284 | cable->running &= ~stream; |
285 | cable->pause &= ~stream; | |
dd04bb12 | 286 | spin_unlock(&cable->lock); |
597603d6 JK |
287 | loopback_timer_stop(dpcm); |
288 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
289 | loopback_active_notify(dpcm); | |
290 | break; | |
5de9e45f JK |
291 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
292 | spin_lock(&cable->lock); | |
293 | cable->pause |= stream; | |
294 | spin_unlock(&cable->lock); | |
295 | loopback_timer_stop(dpcm); | |
296 | break; | |
297 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
298 | spin_lock(&cable->lock); | |
299 | dpcm->last_jiffies = jiffies; | |
300 | cable->pause &= ~stream; | |
301 | spin_unlock(&cable->lock); | |
302 | loopback_timer_start(dpcm); | |
303 | break; | |
597603d6 JK |
304 | default: |
305 | return -EINVAL; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
b1c73fc8 JK |
310 | static void params_change_substream(struct loopback_pcm *dpcm, |
311 | struct snd_pcm_runtime *runtime) | |
312 | { | |
313 | struct snd_pcm_runtime *dst_runtime; | |
314 | ||
315 | if (dpcm == NULL || dpcm->substream == NULL) | |
316 | return; | |
317 | dst_runtime = dpcm->substream->runtime; | |
318 | if (dst_runtime == NULL) | |
319 | return; | |
320 | dst_runtime->hw = dpcm->cable->hw; | |
321 | } | |
322 | ||
323 | static void params_change(struct snd_pcm_substream *substream) | |
324 | { | |
325 | struct snd_pcm_runtime *runtime = substream->runtime; | |
326 | struct loopback_pcm *dpcm = runtime->private_data; | |
327 | struct loopback_cable *cable = dpcm->cable; | |
328 | ||
329 | cable->hw.formats = (1ULL << runtime->format); | |
330 | cable->hw.rate_min = runtime->rate; | |
331 | cable->hw.rate_max = runtime->rate; | |
332 | cable->hw.channels_min = runtime->channels; | |
333 | cable->hw.channels_max = runtime->channels; | |
334 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK], | |
335 | runtime); | |
336 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE], | |
337 | runtime); | |
338 | } | |
339 | ||
597603d6 JK |
340 | static int loopback_prepare(struct snd_pcm_substream *substream) |
341 | { | |
342 | struct snd_pcm_runtime *runtime = substream->runtime; | |
343 | struct loopback_pcm *dpcm = runtime->private_data; | |
344 | struct loopback_cable *cable = dpcm->cable; | |
b1c73fc8 | 345 | int bps, salign; |
597603d6 JK |
346 | |
347 | salign = (snd_pcm_format_width(runtime->format) * | |
348 | runtime->channels) / 8; | |
349 | bps = salign * runtime->rate; | |
350 | if (bps <= 0 || salign <= 0) | |
351 | return -EINVAL; | |
352 | ||
353 | dpcm->buf_pos = 0; | |
354 | dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); | |
355 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { | |
356 | /* clear capture buffer */ | |
357 | dpcm->silent_size = dpcm->pcm_buffer_size; | |
358 | snd_pcm_format_set_silence(runtime->format, runtime->dma_area, | |
359 | runtime->buffer_size * runtime->channels); | |
360 | } | |
361 | ||
362 | dpcm->irq_pos = 0; | |
363 | dpcm->period_update_pending = 0; | |
364 | dpcm->pcm_bps = bps; | |
365 | dpcm->pcm_salign = salign; | |
366 | dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); | |
367 | ||
368 | mutex_lock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
369 | if (!(cable->valid & ~(1 << substream->stream)) || |
370 | (get_setup(dpcm)->notify && | |
371 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) | |
372 | params_change(substream); | |
597603d6 JK |
373 | cable->valid |= 1 << substream->stream; |
374 | mutex_unlock(&dpcm->loopback->cable_lock); | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) | |
380 | { | |
381 | struct snd_pcm_runtime *runtime = dpcm->substream->runtime; | |
382 | char *dst = runtime->dma_area; | |
383 | unsigned int dst_off = dpcm->buf_pos; | |
384 | ||
385 | if (dpcm->silent_size >= dpcm->pcm_buffer_size) | |
386 | return; | |
387 | if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) | |
388 | bytes = dpcm->pcm_buffer_size - dpcm->silent_size; | |
389 | ||
390 | for (;;) { | |
391 | unsigned int size = bytes; | |
392 | if (dst_off + size > dpcm->pcm_buffer_size) | |
393 | size = dpcm->pcm_buffer_size - dst_off; | |
394 | snd_pcm_format_set_silence(runtime->format, dst + dst_off, | |
395 | bytes_to_frames(runtime, size) * | |
396 | runtime->channels); | |
397 | dpcm->silent_size += size; | |
398 | bytes -= size; | |
399 | if (!bytes) | |
400 | break; | |
401 | dst_off = 0; | |
402 | } | |
403 | } | |
404 | ||
405 | static void copy_play_buf(struct loopback_pcm *play, | |
406 | struct loopback_pcm *capt, | |
407 | unsigned int bytes) | |
408 | { | |
409 | struct snd_pcm_runtime *runtime = play->substream->runtime; | |
20d9a26d | 410 | char *src = runtime->dma_area; |
597603d6 JK |
411 | char *dst = capt->substream->runtime->dma_area; |
412 | unsigned int src_off = play->buf_pos; | |
413 | unsigned int dst_off = capt->buf_pos; | |
414 | unsigned int clear_bytes = 0; | |
415 | ||
416 | /* check if playback is draining, trim the capture copy size | |
417 | * when our pointer is at the end of playback ring buffer */ | |
418 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && | |
419 | snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { | |
420 | snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; | |
421 | appl_ptr = appl_ptr1 = runtime->control->appl_ptr; | |
422 | appl_ptr1 -= appl_ptr1 % runtime->buffer_size; | |
423 | appl_ptr1 += play->buf_pos / play->pcm_salign; | |
424 | if (appl_ptr < appl_ptr1) | |
425 | appl_ptr1 -= runtime->buffer_size; | |
426 | diff = (appl_ptr - appl_ptr1) * play->pcm_salign; | |
427 | if (diff < bytes) { | |
428 | clear_bytes = bytes - diff; | |
429 | bytes = diff; | |
430 | } | |
431 | } | |
432 | ||
433 | for (;;) { | |
434 | unsigned int size = bytes; | |
435 | if (src_off + size > play->pcm_buffer_size) | |
436 | size = play->pcm_buffer_size - src_off; | |
437 | if (dst_off + size > capt->pcm_buffer_size) | |
438 | size = capt->pcm_buffer_size - dst_off; | |
439 | memcpy(dst + dst_off, src + src_off, size); | |
440 | capt->silent_size = 0; | |
441 | bytes -= size; | |
442 | if (!bytes) | |
443 | break; | |
444 | src_off = (src_off + size) % play->pcm_buffer_size; | |
445 | dst_off = (dst_off + size) % capt->pcm_buffer_size; | |
446 | } | |
447 | ||
20d9a26d | 448 | if (clear_bytes > 0) { |
597603d6 | 449 | clear_capture_buf(capt, clear_bytes); |
20d9a26d JK |
450 | capt->silent_size = 0; |
451 | } | |
597603d6 JK |
452 | } |
453 | ||
b012513c JK |
454 | static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, |
455 | unsigned int jiffies_delta) | |
597603d6 | 456 | { |
597603d6 | 457 | unsigned long last_pos; |
b012513c | 458 | unsigned int delta; |
597603d6 JK |
459 | |
460 | last_pos = byte_pos(dpcm, dpcm->irq_pos); | |
b012513c JK |
461 | dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; |
462 | delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; | |
463 | if (delta >= dpcm->last_drift) | |
464 | delta -= dpcm->last_drift; | |
465 | dpcm->last_drift = 0; | |
597603d6 JK |
466 | if (dpcm->irq_pos >= dpcm->period_size_frac) { |
467 | dpcm->irq_pos %= dpcm->period_size_frac; | |
468 | dpcm->period_update_pending = 1; | |
469 | } | |
b012513c JK |
470 | return delta; |
471 | } | |
472 | ||
473 | static inline void bytepos_finish(struct loopback_pcm *dpcm, | |
474 | unsigned int delta) | |
475 | { | |
476 | dpcm->buf_pos += delta; | |
477 | dpcm->buf_pos %= dpcm->pcm_buffer_size; | |
597603d6 JK |
478 | } |
479 | ||
dd04bb12 | 480 | static unsigned int loopback_pos_update(struct loopback_cable *cable) |
597603d6 JK |
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; | |
b012513c | 487 | unsigned int running, count1, count2; |
98d21df4 | 488 | unsigned long flags; |
597603d6 | 489 | |
98d21df4 | 490 | spin_lock_irqsave(&cable->lock, flags); |
5de9e45f | 491 | running = cable->running ^ cable->pause; |
dd04bb12 | 492 | if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { |
597603d6 JK |
493 | delta_play = jiffies - dpcm_play->last_jiffies; |
494 | dpcm_play->last_jiffies += delta_play; | |
495 | } | |
496 | ||
dd04bb12 | 497 | if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { |
597603d6 JK |
498 | delta_capt = jiffies - dpcm_capt->last_jiffies; |
499 | dpcm_capt->last_jiffies += delta_capt; | |
500 | } | |
501 | ||
98d21df4 TI |
502 | if (delta_play == 0 && delta_capt == 0) |
503 | goto unlock; | |
597603d6 JK |
504 | |
505 | if (delta_play > delta_capt) { | |
b012513c JK |
506 | count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); |
507 | bytepos_finish(dpcm_play, count1); | |
597603d6 JK |
508 | delta_play = delta_capt; |
509 | } else if (delta_play < delta_capt) { | |
b012513c JK |
510 | count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); |
511 | clear_capture_buf(dpcm_capt, count1); | |
512 | bytepos_finish(dpcm_capt, count1); | |
597603d6 JK |
513 | delta_capt = delta_play; |
514 | } | |
515 | ||
98d21df4 TI |
516 | if (delta_play == 0 && delta_capt == 0) |
517 | goto unlock; | |
518 | ||
597603d6 | 519 | /* note delta_capt == delta_play at this moment */ |
b012513c JK |
520 | count1 = bytepos_delta(dpcm_play, delta_play); |
521 | count2 = bytepos_delta(dpcm_capt, delta_capt); | |
522 | if (count1 < count2) { | |
523 | dpcm_capt->last_drift = count2 - count1; | |
524 | count1 = count2; | |
525 | } else if (count1 > count2) { | |
526 | dpcm_play->last_drift = count1 - count2; | |
527 | } | |
528 | copy_play_buf(dpcm_play, dpcm_capt, count1); | |
529 | bytepos_finish(dpcm_play, count1); | |
530 | bytepos_finish(dpcm_capt, count1); | |
98d21df4 TI |
531 | unlock: |
532 | spin_unlock_irqrestore(&cable->lock, flags); | |
dd04bb12 | 533 | return running; |
597603d6 JK |
534 | } |
535 | ||
536 | static void loopback_timer_function(unsigned long data) | |
537 | { | |
538 | struct loopback_pcm *dpcm = (struct loopback_pcm *)data; | |
dd04bb12 | 539 | unsigned int running; |
597603d6 | 540 | |
dd04bb12 JK |
541 | running = loopback_pos_update(dpcm->cable); |
542 | if (running & (1 << dpcm->substream->stream)) { | |
597603d6 | 543 | loopback_timer_start(dpcm); |
dd04bb12 JK |
544 | if (dpcm->period_update_pending) { |
545 | dpcm->period_update_pending = 0; | |
597603d6 | 546 | snd_pcm_period_elapsed(dpcm->substream); |
dd04bb12 | 547 | } |
597603d6 JK |
548 | } |
549 | } | |
550 | ||
551 | static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) | |
552 | { | |
553 | struct snd_pcm_runtime *runtime = substream->runtime; | |
554 | struct loopback_pcm *dpcm = runtime->private_data; | |
555 | ||
556 | loopback_pos_update(dpcm->cable); | |
557 | return bytes_to_frames(runtime, dpcm->buf_pos); | |
558 | } | |
559 | ||
560 | static struct snd_pcm_hardware loopback_pcm_hardware = | |
561 | { | |
562 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | | |
5de9e45f | 563 | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), |
597603d6 JK |
564 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | |
565 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | | |
566 | SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), | |
567 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, | |
568 | .rate_min = 8000, | |
569 | .rate_max = 192000, | |
570 | .channels_min = 1, | |
571 | .channels_max = 32, | |
572 | .buffer_bytes_max = 2 * 1024 * 1024, | |
573 | .period_bytes_min = 64, | |
0db71023 JK |
574 | /* note check overflow in frac_pos() using pcm_rate_shift before |
575 | changing period_bytes_max value */ | |
576 | .period_bytes_max = 1024 * 1024, | |
597603d6 JK |
577 | .periods_min = 1, |
578 | .periods_max = 1024, | |
579 | .fifo_size = 0, | |
580 | }; | |
581 | ||
582 | static void loopback_runtime_free(struct snd_pcm_runtime *runtime) | |
583 | { | |
584 | struct loopback_pcm *dpcm = runtime->private_data; | |
585 | kfree(dpcm); | |
586 | } | |
587 | ||
588 | static int loopback_hw_params(struct snd_pcm_substream *substream, | |
589 | struct snd_pcm_hw_params *params) | |
590 | { | |
6b69a0e5 TI |
591 | return snd_pcm_lib_alloc_vmalloc_buffer(substream, |
592 | params_buffer_bytes(params)); | |
597603d6 JK |
593 | } |
594 | ||
595 | static int loopback_hw_free(struct snd_pcm_substream *substream) | |
596 | { | |
597 | struct snd_pcm_runtime *runtime = substream->runtime; | |
598 | struct loopback_pcm *dpcm = runtime->private_data; | |
599 | struct loopback_cable *cable = dpcm->cable; | |
600 | ||
601 | mutex_lock(&dpcm->loopback->cable_lock); | |
602 | cable->valid &= ~(1 << substream->stream); | |
603 | mutex_unlock(&dpcm->loopback->cable_lock); | |
6b69a0e5 | 604 | return snd_pcm_lib_free_vmalloc_buffer(substream); |
597603d6 JK |
605 | } |
606 | ||
607 | static unsigned int get_cable_index(struct snd_pcm_substream *substream) | |
608 | { | |
609 | if (!substream->pcm->device) | |
610 | return substream->stream; | |
611 | else | |
612 | return !substream->stream; | |
613 | } | |
614 | ||
b1c73fc8 JK |
615 | static int rule_format(struct snd_pcm_hw_params *params, |
616 | struct snd_pcm_hw_rule *rule) | |
617 | { | |
618 | ||
619 | struct snd_pcm_hardware *hw = rule->private; | |
620 | struct snd_mask *maskp = hw_param_mask(params, rule->var); | |
621 | ||
622 | maskp->bits[0] &= (u_int32_t)hw->formats; | |
623 | maskp->bits[1] &= (u_int32_t)(hw->formats >> 32); | |
624 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ | |
625 | if (! maskp->bits[0] && ! maskp->bits[1]) | |
626 | return -EINVAL; | |
627 | return 0; | |
628 | } | |
629 | ||
630 | static int rule_rate(struct snd_pcm_hw_params *params, | |
631 | struct snd_pcm_hw_rule *rule) | |
632 | { | |
633 | struct snd_pcm_hardware *hw = rule->private; | |
634 | struct snd_interval t; | |
635 | ||
636 | t.min = hw->rate_min; | |
637 | t.max = hw->rate_max; | |
638 | t.openmin = t.openmax = 0; | |
639 | t.integer = 0; | |
640 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
641 | } | |
642 | ||
643 | static int rule_channels(struct snd_pcm_hw_params *params, | |
644 | struct snd_pcm_hw_rule *rule) | |
645 | { | |
646 | struct snd_pcm_hardware *hw = rule->private; | |
647 | struct snd_interval t; | |
648 | ||
649 | t.min = hw->channels_min; | |
650 | t.max = hw->channels_max; | |
651 | t.openmin = t.openmax = 0; | |
652 | t.integer = 0; | |
653 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
654 | } | |
655 | ||
597603d6 JK |
656 | static int loopback_open(struct snd_pcm_substream *substream) |
657 | { | |
658 | struct snd_pcm_runtime *runtime = substream->runtime; | |
659 | struct loopback *loopback = substream->private_data; | |
660 | struct loopback_pcm *dpcm; | |
661 | struct loopback_cable *cable; | |
662 | int err = 0; | |
663 | int dev = get_cable_index(substream); | |
664 | ||
665 | mutex_lock(&loopback->cable_lock); | |
666 | dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); | |
667 | if (!dpcm) { | |
668 | err = -ENOMEM; | |
669 | goto unlock; | |
670 | } | |
671 | dpcm->loopback = loopback; | |
672 | dpcm->substream = substream; | |
673 | setup_timer(&dpcm->timer, loopback_timer_function, | |
674 | (unsigned long)dpcm); | |
d4f1e48b | 675 | spin_lock_init(&dpcm->timer_lock); |
597603d6 JK |
676 | |
677 | cable = loopback->cables[substream->number][dev]; | |
678 | if (!cable) { | |
679 | cable = kzalloc(sizeof(*cable), GFP_KERNEL); | |
680 | if (!cable) { | |
681 | kfree(dpcm); | |
682 | err = -ENOMEM; | |
683 | goto unlock; | |
684 | } | |
685 | spin_lock_init(&cable->lock); | |
686 | cable->hw = loopback_pcm_hardware; | |
687 | loopback->cables[substream->number][dev] = cable; | |
688 | } | |
689 | dpcm->cable = cable; | |
690 | cable->streams[substream->stream] = dpcm; | |
691 | ||
692 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
693 | ||
b1c73fc8 JK |
694 | /* use dynamic rules based on actual runtime->hw values */ |
695 | /* note that the default rules created in the PCM midlevel code */ | |
696 | /* are cached -> they do not reflect the actual state */ | |
697 | err = snd_pcm_hw_rule_add(runtime, 0, | |
698 | SNDRV_PCM_HW_PARAM_FORMAT, | |
699 | rule_format, &runtime->hw, | |
700 | SNDRV_PCM_HW_PARAM_FORMAT, -1); | |
701 | if (err < 0) | |
702 | goto unlock; | |
703 | err = snd_pcm_hw_rule_add(runtime, 0, | |
704 | SNDRV_PCM_HW_PARAM_RATE, | |
705 | rule_rate, &runtime->hw, | |
706 | SNDRV_PCM_HW_PARAM_RATE, -1); | |
707 | if (err < 0) | |
708 | goto unlock; | |
709 | err = snd_pcm_hw_rule_add(runtime, 0, | |
710 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
711 | rule_channels, &runtime->hw, | |
712 | SNDRV_PCM_HW_PARAM_CHANNELS, -1); | |
713 | if (err < 0) | |
714 | goto unlock; | |
715 | ||
597603d6 JK |
716 | runtime->private_data = dpcm; |
717 | runtime->private_free = loopback_runtime_free; | |
b1c73fc8 | 718 | if (get_notify(dpcm)) |
597603d6 | 719 | runtime->hw = loopback_pcm_hardware; |
b1c73fc8 | 720 | else |
597603d6 | 721 | runtime->hw = cable->hw; |
597603d6 JK |
722 | unlock: |
723 | mutex_unlock(&loopback->cable_lock); | |
724 | return err; | |
725 | } | |
726 | ||
727 | static int loopback_close(struct snd_pcm_substream *substream) | |
728 | { | |
729 | struct loopback *loopback = substream->private_data; | |
730 | struct loopback_pcm *dpcm = substream->runtime->private_data; | |
731 | struct loopback_cable *cable; | |
732 | int dev = get_cable_index(substream); | |
733 | ||
734 | loopback_timer_stop(dpcm); | |
735 | mutex_lock(&loopback->cable_lock); | |
736 | cable = loopback->cables[substream->number][dev]; | |
737 | if (cable->streams[!substream->stream]) { | |
738 | /* other stream is still alive */ | |
739 | cable->streams[substream->stream] = NULL; | |
740 | } else { | |
741 | /* free the cable */ | |
742 | loopback->cables[substream->number][dev] = NULL; | |
743 | kfree(cable); | |
744 | } | |
745 | mutex_unlock(&loopback->cable_lock); | |
746 | return 0; | |
747 | } | |
748 | ||
749 | static struct snd_pcm_ops loopback_playback_ops = { | |
750 | .open = loopback_open, | |
751 | .close = loopback_close, | |
752 | .ioctl = snd_pcm_lib_ioctl, | |
753 | .hw_params = loopback_hw_params, | |
754 | .hw_free = loopback_hw_free, | |
755 | .prepare = loopback_prepare, | |
756 | .trigger = loopback_trigger, | |
757 | .pointer = loopback_pointer, | |
6b69a0e5 TI |
758 | .page = snd_pcm_lib_get_vmalloc_page, |
759 | .mmap = snd_pcm_lib_mmap_vmalloc, | |
597603d6 JK |
760 | }; |
761 | ||
762 | static struct snd_pcm_ops loopback_capture_ops = { | |
763 | .open = loopback_open, | |
764 | .close = loopback_close, | |
765 | .ioctl = snd_pcm_lib_ioctl, | |
766 | .hw_params = loopback_hw_params, | |
767 | .hw_free = loopback_hw_free, | |
768 | .prepare = loopback_prepare, | |
769 | .trigger = loopback_trigger, | |
770 | .pointer = loopback_pointer, | |
6b69a0e5 TI |
771 | .page = snd_pcm_lib_get_vmalloc_page, |
772 | .mmap = snd_pcm_lib_mmap_vmalloc, | |
597603d6 JK |
773 | }; |
774 | ||
775 | static int __devinit loopback_pcm_new(struct loopback *loopback, | |
776 | int device, int substreams) | |
777 | { | |
778 | struct snd_pcm *pcm; | |
779 | int err; | |
780 | ||
781 | err = snd_pcm_new(loopback->card, "Loopback PCM", device, | |
782 | substreams, substreams, &pcm); | |
783 | if (err < 0) | |
784 | return err; | |
785 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); | |
786 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); | |
787 | ||
788 | pcm->private_data = loopback; | |
789 | pcm->info_flags = 0; | |
790 | strcpy(pcm->name, "Loopback PCM"); | |
791 | ||
792 | loopback->pcm[device] = pcm; | |
597603d6 JK |
793 | return 0; |
794 | } | |
795 | ||
796 | static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, | |
797 | struct snd_ctl_elem_info *uinfo) | |
798 | { | |
799 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
800 | uinfo->count = 1; | |
801 | uinfo->value.integer.min = 80000; | |
802 | uinfo->value.integer.max = 120000; | |
803 | uinfo->value.integer.step = 1; | |
804 | return 0; | |
805 | } | |
806 | ||
807 | static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, | |
808 | struct snd_ctl_elem_value *ucontrol) | |
809 | { | |
810 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
811 | ||
812 | ucontrol->value.integer.value[0] = | |
813 | loopback->setup[kcontrol->id.subdevice] | |
814 | [kcontrol->id.device].rate_shift; | |
815 | return 0; | |
816 | } | |
817 | ||
818 | static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, | |
819 | struct snd_ctl_elem_value *ucontrol) | |
820 | { | |
821 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
822 | unsigned int val; | |
823 | int change = 0; | |
824 | ||
825 | val = ucontrol->value.integer.value[0]; | |
826 | if (val < 80000) | |
827 | val = 80000; | |
828 | if (val > 120000) | |
829 | val = 120000; | |
830 | mutex_lock(&loopback->cable_lock); | |
831 | if (val != loopback->setup[kcontrol->id.subdevice] | |
832 | [kcontrol->id.device].rate_shift) { | |
833 | loopback->setup[kcontrol->id.subdevice] | |
834 | [kcontrol->id.device].rate_shift = val; | |
835 | change = 1; | |
836 | } | |
837 | mutex_unlock(&loopback->cable_lock); | |
838 | return change; | |
839 | } | |
840 | ||
841 | static int loopback_notify_get(struct snd_kcontrol *kcontrol, | |
842 | struct snd_ctl_elem_value *ucontrol) | |
843 | { | |
844 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
845 | ||
846 | ucontrol->value.integer.value[0] = | |
847 | loopback->setup[kcontrol->id.subdevice] | |
848 | [kcontrol->id.device].notify; | |
849 | return 0; | |
850 | } | |
851 | ||
852 | static int loopback_notify_put(struct snd_kcontrol *kcontrol, | |
853 | struct snd_ctl_elem_value *ucontrol) | |
854 | { | |
855 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
856 | unsigned int val; | |
857 | int change = 0; | |
858 | ||
859 | val = ucontrol->value.integer.value[0] ? 1 : 0; | |
860 | if (val != loopback->setup[kcontrol->id.subdevice] | |
861 | [kcontrol->id.device].notify) { | |
862 | loopback->setup[kcontrol->id.subdevice] | |
863 | [kcontrol->id.device].notify = val; | |
864 | change = 1; | |
865 | } | |
866 | return change; | |
867 | } | |
868 | ||
869 | static int loopback_active_get(struct snd_kcontrol *kcontrol, | |
870 | struct snd_ctl_elem_value *ucontrol) | |
871 | { | |
872 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
873 | struct loopback_cable *cable = loopback->cables | |
ac446fb7 | 874 | [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; |
597603d6 JK |
875 | unsigned int val = 0; |
876 | ||
877 | if (cable != NULL) | |
878 | val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? | |
879 | 1 : 0; | |
880 | ucontrol->value.integer.value[0] = val; | |
881 | return 0; | |
882 | } | |
883 | ||
884 | static int loopback_format_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 = 0; | |
890 | uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; | |
891 | uinfo->value.integer.step = 1; | |
892 | return 0; | |
893 | } | |
894 | ||
895 | static int loopback_format_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].format; | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static int loopback_rate_info(struct snd_kcontrol *kcontrol, | |
907 | struct snd_ctl_elem_info *uinfo) | |
908 | { | |
909 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
910 | uinfo->count = 1; | |
911 | uinfo->value.integer.min = 0; | |
912 | uinfo->value.integer.max = 192000; | |
913 | uinfo->value.integer.step = 1; | |
914 | return 0; | |
915 | } | |
916 | ||
917 | static int loopback_rate_get(struct snd_kcontrol *kcontrol, | |
918 | struct snd_ctl_elem_value *ucontrol) | |
919 | { | |
920 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
921 | ||
922 | ucontrol->value.integer.value[0] = | |
923 | loopback->setup[kcontrol->id.subdevice] | |
924 | [kcontrol->id.device].rate; | |
925 | return 0; | |
926 | } | |
927 | ||
928 | static int loopback_channels_info(struct snd_kcontrol *kcontrol, | |
929 | struct snd_ctl_elem_info *uinfo) | |
930 | { | |
931 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
932 | uinfo->count = 1; | |
933 | uinfo->value.integer.min = 1; | |
934 | uinfo->value.integer.max = 1024; | |
935 | uinfo->value.integer.step = 1; | |
936 | return 0; | |
937 | } | |
938 | ||
939 | static int loopback_channels_get(struct snd_kcontrol *kcontrol, | |
940 | struct snd_ctl_elem_value *ucontrol) | |
941 | { | |
942 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
943 | ||
944 | ucontrol->value.integer.value[0] = | |
945 | loopback->setup[kcontrol->id.subdevice] | |
1446c5fb | 946 | [kcontrol->id.device].channels; |
597603d6 JK |
947 | return 0; |
948 | } | |
949 | ||
950 | static struct snd_kcontrol_new loopback_controls[] __devinitdata = { | |
951 | { | |
952 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
953 | .name = "PCM Rate Shift 100000", | |
954 | .info = loopback_rate_shift_info, | |
955 | .get = loopback_rate_shift_get, | |
956 | .put = loopback_rate_shift_put, | |
957 | }, | |
958 | { | |
959 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
960 | .name = "PCM Notify", | |
961 | .info = snd_ctl_boolean_mono_info, | |
962 | .get = loopback_notify_get, | |
963 | .put = loopback_notify_put, | |
964 | }, | |
965 | #define ACTIVE_IDX 2 | |
966 | { | |
967 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
968 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
969 | .name = "PCM Slave Active", | |
970 | .info = snd_ctl_boolean_mono_info, | |
971 | .get = loopback_active_get, | |
972 | }, | |
973 | #define FORMAT_IDX 3 | |
974 | { | |
975 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
976 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
977 | .name = "PCM Slave Format", | |
978 | .info = loopback_format_info, | |
979 | .get = loopback_format_get | |
980 | }, | |
981 | #define RATE_IDX 4 | |
982 | { | |
983 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
984 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
985 | .name = "PCM Slave Rate", | |
986 | .info = loopback_rate_info, | |
987 | .get = loopback_rate_get | |
988 | }, | |
989 | #define CHANNELS_IDX 5 | |
990 | { | |
991 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
992 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
993 | .name = "PCM Slave Channels", | |
994 | .info = loopback_channels_info, | |
995 | .get = loopback_channels_get | |
996 | } | |
997 | }; | |
998 | ||
999 | static int __devinit loopback_mixer_new(struct loopback *loopback, int notify) | |
1000 | { | |
1001 | struct snd_card *card = loopback->card; | |
1002 | struct snd_pcm *pcm; | |
1003 | struct snd_kcontrol *kctl; | |
1004 | struct loopback_setup *setup; | |
1005 | int err, dev, substr, substr_count, idx; | |
1006 | ||
1007 | strcpy(card->mixername, "Loopback Mixer"); | |
1008 | for (dev = 0; dev < 2; dev++) { | |
1009 | pcm = loopback->pcm[dev]; | |
1010 | substr_count = | |
1011 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; | |
1012 | for (substr = 0; substr < substr_count; substr++) { | |
1013 | setup = &loopback->setup[substr][dev]; | |
1014 | setup->notify = notify; | |
1015 | setup->rate_shift = NO_PITCH; | |
1016 | setup->format = SNDRV_PCM_FORMAT_S16_LE; | |
1017 | setup->rate = 48000; | |
1018 | setup->channels = 2; | |
1019 | for (idx = 0; idx < ARRAY_SIZE(loopback_controls); | |
1020 | idx++) { | |
1021 | kctl = snd_ctl_new1(&loopback_controls[idx], | |
1022 | loopback); | |
1023 | if (!kctl) | |
1024 | return -ENOMEM; | |
1025 | kctl->id.device = dev; | |
1026 | kctl->id.subdevice = substr; | |
1027 | switch (idx) { | |
1028 | case ACTIVE_IDX: | |
1029 | setup->active_id = kctl->id; | |
1030 | break; | |
1031 | case FORMAT_IDX: | |
1032 | setup->format_id = kctl->id; | |
1033 | break; | |
1034 | case RATE_IDX: | |
1035 | setup->rate_id = kctl->id; | |
1036 | break; | |
1037 | case CHANNELS_IDX: | |
1038 | setup->channels_id = kctl->id; | |
1039 | break; | |
1040 | default: | |
1041 | break; | |
1042 | } | |
1043 | err = snd_ctl_add(card, kctl); | |
1044 | if (err < 0) | |
1045 | return err; | |
1046 | } | |
1047 | } | |
1048 | } | |
1049 | return 0; | |
1050 | } | |
1051 | ||
e74670b6 JK |
1052 | #ifdef CONFIG_PROC_FS |
1053 | ||
1054 | static void print_dpcm_info(struct snd_info_buffer *buffer, | |
1055 | struct loopback_pcm *dpcm, | |
1056 | const char *id) | |
1057 | { | |
1058 | snd_iprintf(buffer, " %s\n", id); | |
1059 | if (dpcm == NULL) { | |
1060 | snd_iprintf(buffer, " inactive\n"); | |
1061 | return; | |
1062 | } | |
1063 | snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); | |
1064 | snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); | |
1065 | snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); | |
1066 | snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); | |
1067 | snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); | |
1068 | snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); | |
1069 | snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); | |
1070 | snd_iprintf(buffer, " update_pending:\t%u\n", | |
1071 | dpcm->period_update_pending); | |
1072 | snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); | |
1073 | snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); | |
1074 | snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", | |
1075 | dpcm->last_jiffies, jiffies); | |
1076 | snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); | |
1077 | } | |
1078 | ||
1079 | static void print_substream_info(struct snd_info_buffer *buffer, | |
1080 | struct loopback *loopback, | |
1081 | int sub, | |
1082 | int num) | |
1083 | { | |
1084 | struct loopback_cable *cable = loopback->cables[sub][num]; | |
1085 | ||
1086 | snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); | |
1087 | if (cable == NULL) { | |
1088 | snd_iprintf(buffer, " inactive\n"); | |
1089 | return; | |
1090 | } | |
1091 | snd_iprintf(buffer, " valid: %u\n", cable->valid); | |
1092 | snd_iprintf(buffer, " running: %u\n", cable->running); | |
5de9e45f | 1093 | snd_iprintf(buffer, " pause: %u\n", cable->pause); |
e74670b6 JK |
1094 | print_dpcm_info(buffer, cable->streams[0], "Playback"); |
1095 | print_dpcm_info(buffer, cable->streams[1], "Capture"); | |
1096 | } | |
1097 | ||
1098 | static void print_cable_info(struct snd_info_entry *entry, | |
1099 | struct snd_info_buffer *buffer) | |
1100 | { | |
1101 | struct loopback *loopback = entry->private_data; | |
1102 | int sub, num; | |
1103 | ||
1104 | mutex_lock(&loopback->cable_lock); | |
1105 | num = entry->name[strlen(entry->name)-1]; | |
1106 | num = num == '0' ? 0 : 1; | |
1107 | for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) | |
1108 | print_substream_info(buffer, loopback, sub, num); | |
1109 | mutex_unlock(&loopback->cable_lock); | |
1110 | } | |
1111 | ||
1112 | static int __devinit loopback_proc_new(struct loopback *loopback, int cidx) | |
1113 | { | |
1114 | char name[32]; | |
1115 | struct snd_info_entry *entry; | |
1116 | int err; | |
1117 | ||
1118 | snprintf(name, sizeof(name), "cable#%d", cidx); | |
1119 | err = snd_card_proc_new(loopback->card, name, &entry); | |
1120 | if (err < 0) | |
1121 | return err; | |
1122 | ||
1123 | snd_info_set_text_ops(entry, loopback, print_cable_info); | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | #else /* !CONFIG_PROC_FS */ | |
1128 | ||
1129 | #define loopback_proc_new(loopback, cidx) do { } while (0) | |
1130 | ||
1131 | #endif | |
1132 | ||
597603d6 JK |
1133 | static int __devinit loopback_probe(struct platform_device *devptr) |
1134 | { | |
1135 | struct snd_card *card; | |
1136 | struct loopback *loopback; | |
1137 | int dev = devptr->id; | |
1138 | int err; | |
1139 | ||
1140 | err = snd_card_create(index[dev], id[dev], THIS_MODULE, | |
1141 | sizeof(struct loopback), &card); | |
1142 | if (err < 0) | |
1143 | return err; | |
1144 | loopback = card->private_data; | |
1145 | ||
1146 | if (pcm_substreams[dev] < 1) | |
1147 | pcm_substreams[dev] = 1; | |
1148 | if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) | |
1149 | pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; | |
1150 | ||
1151 | loopback->card = card; | |
1152 | mutex_init(&loopback->cable_lock); | |
1153 | ||
1154 | err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); | |
1155 | if (err < 0) | |
1156 | goto __nodev; | |
1157 | err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); | |
1158 | if (err < 0) | |
1159 | goto __nodev; | |
1160 | err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); | |
1161 | if (err < 0) | |
1162 | goto __nodev; | |
e74670b6 JK |
1163 | loopback_proc_new(loopback, 0); |
1164 | loopback_proc_new(loopback, 1); | |
597603d6 JK |
1165 | strcpy(card->driver, "Loopback"); |
1166 | strcpy(card->shortname, "Loopback"); | |
1167 | sprintf(card->longname, "Loopback %i", dev + 1); | |
1168 | err = snd_card_register(card); | |
1169 | if (!err) { | |
1170 | platform_set_drvdata(devptr, card); | |
1171 | return 0; | |
1172 | } | |
1173 | __nodev: | |
1174 | snd_card_free(card); | |
1175 | return err; | |
1176 | } | |
1177 | ||
1178 | static int __devexit loopback_remove(struct platform_device *devptr) | |
1179 | { | |
1180 | snd_card_free(platform_get_drvdata(devptr)); | |
1181 | platform_set_drvdata(devptr, NULL); | |
1182 | return 0; | |
1183 | } | |
1184 | ||
d34e4e00 | 1185 | #ifdef CONFIG_PM_SLEEP |
284e7ca7 | 1186 | static int loopback_suspend(struct device *pdev) |
597603d6 | 1187 | { |
284e7ca7 | 1188 | struct snd_card *card = dev_get_drvdata(pdev); |
597603d6 JK |
1189 | struct loopback *loopback = card->private_data; |
1190 | ||
1191 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
1192 | ||
1193 | snd_pcm_suspend_all(loopback->pcm[0]); | |
1194 | snd_pcm_suspend_all(loopback->pcm[1]); | |
1195 | return 0; | |
1196 | } | |
1197 | ||
284e7ca7 | 1198 | static int loopback_resume(struct device *pdev) |
597603d6 | 1199 | { |
284e7ca7 | 1200 | struct snd_card *card = dev_get_drvdata(pdev); |
597603d6 JK |
1201 | |
1202 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
1203 | return 0; | |
1204 | } | |
284e7ca7 TI |
1205 | |
1206 | static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); | |
1207 | #define LOOPBACK_PM_OPS &loopback_pm | |
1208 | #else | |
1209 | #define LOOPBACK_PM_OPS NULL | |
597603d6 JK |
1210 | #endif |
1211 | ||
1212 | #define SND_LOOPBACK_DRIVER "snd_aloop" | |
1213 | ||
1214 | static struct platform_driver loopback_driver = { | |
1215 | .probe = loopback_probe, | |
1216 | .remove = __devexit_p(loopback_remove), | |
597603d6 | 1217 | .driver = { |
8bf01d8a TI |
1218 | .name = SND_LOOPBACK_DRIVER, |
1219 | .owner = THIS_MODULE, | |
284e7ca7 | 1220 | .pm = LOOPBACK_PM_OPS, |
597603d6 JK |
1221 | }, |
1222 | }; | |
1223 | ||
1224 | static void loopback_unregister_all(void) | |
1225 | { | |
1226 | int i; | |
1227 | ||
1228 | for (i = 0; i < ARRAY_SIZE(devices); ++i) | |
1229 | platform_device_unregister(devices[i]); | |
1230 | platform_driver_unregister(&loopback_driver); | |
1231 | } | |
1232 | ||
1233 | static int __init alsa_card_loopback_init(void) | |
1234 | { | |
1235 | int i, err, cards; | |
1236 | ||
1237 | err = platform_driver_register(&loopback_driver); | |
1238 | if (err < 0) | |
1239 | return err; | |
1240 | ||
1241 | ||
1242 | cards = 0; | |
1243 | for (i = 0; i < SNDRV_CARDS; i++) { | |
1244 | struct platform_device *device; | |
1245 | if (!enable[i]) | |
1246 | continue; | |
1247 | device = platform_device_register_simple(SND_LOOPBACK_DRIVER, | |
1248 | i, NULL, 0); | |
1249 | if (IS_ERR(device)) | |
1250 | continue; | |
1251 | if (!platform_get_drvdata(device)) { | |
1252 | platform_device_unregister(device); | |
1253 | continue; | |
1254 | } | |
1255 | devices[i] = device; | |
1256 | cards++; | |
1257 | } | |
1258 | if (!cards) { | |
1259 | #ifdef MODULE | |
1260 | printk(KERN_ERR "aloop: No loopback enabled\n"); | |
1261 | #endif | |
1262 | loopback_unregister_all(); | |
1263 | return -ENODEV; | |
1264 | } | |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | static void __exit alsa_card_loopback_exit(void) | |
1269 | { | |
1270 | loopback_unregister_all(); | |
1271 | } | |
1272 | ||
1273 | module_init(alsa_card_loopback_init) | |
1274 | module_exit(alsa_card_loopback_exit) |