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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> | |
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 */ | |
54 | static int 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 | }; | |
81 | ||
82 | struct loopback_setup { | |
83 | unsigned int notify: 1; | |
84 | unsigned int rate_shift; | |
85 | unsigned int format; | |
86 | unsigned int rate; | |
87 | unsigned int channels; | |
88 | struct snd_ctl_elem_id active_id; | |
89 | struct snd_ctl_elem_id format_id; | |
90 | struct snd_ctl_elem_id rate_id; | |
91 | struct snd_ctl_elem_id channels_id; | |
92 | }; | |
93 | ||
94 | struct loopback { | |
95 | struct snd_card *card; | |
96 | struct mutex cable_lock; | |
97 | struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2]; | |
98 | struct snd_pcm *pcm[2]; | |
99 | struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2]; | |
100 | }; | |
101 | ||
102 | struct loopback_pcm { | |
103 | struct loopback *loopback; | |
104 | struct snd_pcm_substream *substream; | |
105 | struct loopback_cable *cable; | |
106 | unsigned int pcm_buffer_size; | |
107 | unsigned int buf_pos; /* position in buffer */ | |
108 | unsigned int silent_size; | |
109 | /* PCM parameters */ | |
110 | unsigned int pcm_period_size; | |
111 | unsigned int pcm_bps; /* bytes per second */ | |
112 | unsigned int pcm_salign; /* bytes per sample * channels */ | |
113 | unsigned int pcm_rate_shift; /* rate shift value */ | |
114 | /* flags */ | |
115 | unsigned int period_update_pending :1; | |
116 | /* timer stuff */ | |
117 | unsigned int irq_pos; /* fractional IRQ position */ | |
118 | unsigned int period_size_frac; | |
119 | unsigned long last_jiffies; | |
120 | struct timer_list timer; | |
121 | }; | |
122 | ||
123 | static struct platform_device *devices[SNDRV_CARDS]; | |
124 | ||
125 | static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) | |
126 | { | |
127 | if (dpcm->pcm_rate_shift == NO_PITCH) { | |
128 | x /= HZ; | |
129 | } else { | |
130 | x = div_u64(NO_PITCH * (unsigned long long)x, | |
131 | HZ * (unsigned long long)dpcm->pcm_rate_shift); | |
132 | } | |
133 | return x - (x % dpcm->pcm_salign); | |
134 | } | |
135 | ||
136 | static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) | |
137 | { | |
138 | if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ | |
139 | return x * HZ; | |
140 | } else { | |
141 | x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, | |
142 | NO_PITCH); | |
143 | } | |
144 | return x; | |
145 | } | |
146 | ||
147 | static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) | |
148 | { | |
149 | int device = dpcm->substream->pstr->pcm->device; | |
150 | ||
151 | if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
152 | device ^= 1; | |
153 | return &dpcm->loopback->setup[dpcm->substream->number][device]; | |
154 | } | |
155 | ||
156 | static inline unsigned int get_notify(struct loopback_pcm *dpcm) | |
157 | { | |
158 | return get_setup(dpcm)->notify; | |
159 | } | |
160 | ||
161 | static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) | |
162 | { | |
163 | return get_setup(dpcm)->rate_shift; | |
164 | } | |
165 | ||
166 | static void loopback_timer_start(struct loopback_pcm *dpcm) | |
167 | { | |
168 | unsigned long tick; | |
169 | unsigned int rate_shift = get_rate_shift(dpcm); | |
170 | ||
171 | if (rate_shift != dpcm->pcm_rate_shift) { | |
172 | dpcm->pcm_rate_shift = rate_shift; | |
173 | dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); | |
174 | } | |
0db71023 JK |
175 | if (dpcm->period_size_frac <= dpcm->irq_pos) { |
176 | dpcm->irq_pos %= dpcm->period_size_frac; | |
177 | dpcm->period_update_pending = 1; | |
178 | } | |
597603d6 JK |
179 | tick = dpcm->period_size_frac - dpcm->irq_pos; |
180 | tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; | |
181 | dpcm->timer.expires = jiffies + tick; | |
182 | add_timer(&dpcm->timer); | |
183 | } | |
184 | ||
185 | static inline void loopback_timer_stop(struct loopback_pcm *dpcm) | |
186 | { | |
187 | del_timer(&dpcm->timer); | |
e74670b6 | 188 | dpcm->timer.expires = 0; |
597603d6 JK |
189 | } |
190 | ||
191 | #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) | |
192 | #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) | |
193 | #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) | |
194 | ||
195 | static int loopback_check_format(struct loopback_cable *cable, int stream) | |
196 | { | |
b1c73fc8 | 197 | struct snd_pcm_runtime *runtime, *cruntime; |
597603d6 JK |
198 | struct loopback_setup *setup; |
199 | struct snd_card *card; | |
200 | int check; | |
201 | ||
202 | if (cable->valid != CABLE_VALID_BOTH) { | |
203 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) | |
204 | goto __notify; | |
205 | return 0; | |
206 | } | |
207 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
208 | substream->runtime; | |
b1c73fc8 JK |
209 | cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> |
210 | substream->runtime; | |
211 | check = runtime->format != cruntime->format || | |
212 | runtime->rate != cruntime->rate || | |
213 | runtime->channels != cruntime->channels; | |
597603d6 JK |
214 | if (!check) |
215 | return 0; | |
216 | if (stream == SNDRV_PCM_STREAM_CAPTURE) { | |
217 | return -EIO; | |
218 | } else { | |
219 | snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> | |
220 | substream, SNDRV_PCM_STATE_DRAINING); | |
221 | __notify: | |
222 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
223 | substream->runtime; | |
224 | setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); | |
225 | card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; | |
226 | if (setup->format != runtime->format) { | |
227 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
228 | &setup->format_id); | |
229 | setup->format = runtime->format; | |
230 | } | |
231 | if (setup->rate != runtime->rate) { | |
232 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
233 | &setup->rate_id); | |
234 | setup->rate = runtime->rate; | |
235 | } | |
236 | if (setup->channels != runtime->channels) { | |
237 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
238 | &setup->channels_id); | |
239 | setup->channels = runtime->channels; | |
240 | } | |
241 | } | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static void loopback_active_notify(struct loopback_pcm *dpcm) | |
246 | { | |
247 | snd_ctl_notify(dpcm->loopback->card, | |
248 | SNDRV_CTL_EVENT_MASK_VALUE, | |
249 | &get_setup(dpcm)->active_id); | |
250 | } | |
251 | ||
252 | static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) | |
253 | { | |
254 | struct snd_pcm_runtime *runtime = substream->runtime; | |
255 | struct loopback_pcm *dpcm = runtime->private_data; | |
256 | struct loopback_cable *cable = dpcm->cable; | |
257 | int err; | |
258 | ||
259 | switch (cmd) { | |
260 | case SNDRV_PCM_TRIGGER_START: | |
261 | err = loopback_check_format(cable, substream->stream); | |
262 | if (err < 0) | |
263 | return err; | |
264 | dpcm->last_jiffies = jiffies; | |
265 | dpcm->pcm_rate_shift = 0; | |
dd04bb12 | 266 | spin_lock(&cable->lock); |
597603d6 | 267 | cable->running |= (1 << substream->stream); |
dd04bb12 JK |
268 | spin_unlock(&cable->lock); |
269 | loopback_timer_start(dpcm); | |
597603d6 JK |
270 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
271 | loopback_active_notify(dpcm); | |
272 | break; | |
273 | case SNDRV_PCM_TRIGGER_STOP: | |
dd04bb12 | 274 | spin_lock(&cable->lock); |
597603d6 | 275 | cable->running &= ~(1 << substream->stream); |
dd04bb12 | 276 | spin_unlock(&cable->lock); |
597603d6 JK |
277 | loopback_timer_stop(dpcm); |
278 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
279 | loopback_active_notify(dpcm); | |
280 | break; | |
281 | default: | |
282 | return -EINVAL; | |
283 | } | |
284 | return 0; | |
285 | } | |
286 | ||
b1c73fc8 JK |
287 | static void params_change_substream(struct loopback_pcm *dpcm, |
288 | struct snd_pcm_runtime *runtime) | |
289 | { | |
290 | struct snd_pcm_runtime *dst_runtime; | |
291 | ||
292 | if (dpcm == NULL || dpcm->substream == NULL) | |
293 | return; | |
294 | dst_runtime = dpcm->substream->runtime; | |
295 | if (dst_runtime == NULL) | |
296 | return; | |
297 | dst_runtime->hw = dpcm->cable->hw; | |
298 | } | |
299 | ||
300 | static void params_change(struct snd_pcm_substream *substream) | |
301 | { | |
302 | struct snd_pcm_runtime *runtime = substream->runtime; | |
303 | struct loopback_pcm *dpcm = runtime->private_data; | |
304 | struct loopback_cable *cable = dpcm->cable; | |
305 | ||
306 | cable->hw.formats = (1ULL << runtime->format); | |
307 | cable->hw.rate_min = runtime->rate; | |
308 | cable->hw.rate_max = runtime->rate; | |
309 | cable->hw.channels_min = runtime->channels; | |
310 | cable->hw.channels_max = runtime->channels; | |
311 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK], | |
312 | runtime); | |
313 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE], | |
314 | runtime); | |
315 | } | |
316 | ||
597603d6 JK |
317 | static int loopback_prepare(struct snd_pcm_substream *substream) |
318 | { | |
319 | struct snd_pcm_runtime *runtime = substream->runtime; | |
320 | struct loopback_pcm *dpcm = runtime->private_data; | |
321 | struct loopback_cable *cable = dpcm->cable; | |
b1c73fc8 | 322 | int bps, salign; |
597603d6 JK |
323 | |
324 | salign = (snd_pcm_format_width(runtime->format) * | |
325 | runtime->channels) / 8; | |
326 | bps = salign * runtime->rate; | |
327 | if (bps <= 0 || salign <= 0) | |
328 | return -EINVAL; | |
329 | ||
330 | dpcm->buf_pos = 0; | |
331 | dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); | |
332 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { | |
333 | /* clear capture buffer */ | |
334 | dpcm->silent_size = dpcm->pcm_buffer_size; | |
335 | snd_pcm_format_set_silence(runtime->format, runtime->dma_area, | |
336 | runtime->buffer_size * runtime->channels); | |
337 | } | |
338 | ||
339 | dpcm->irq_pos = 0; | |
340 | dpcm->period_update_pending = 0; | |
341 | dpcm->pcm_bps = bps; | |
342 | dpcm->pcm_salign = salign; | |
343 | dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); | |
344 | ||
345 | mutex_lock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
346 | if (!(cable->valid & ~(1 << substream->stream)) || |
347 | (get_setup(dpcm)->notify && | |
348 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) | |
349 | params_change(substream); | |
597603d6 JK |
350 | cable->valid |= 1 << substream->stream; |
351 | mutex_unlock(&dpcm->loopback->cable_lock); | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) | |
357 | { | |
358 | struct snd_pcm_runtime *runtime = dpcm->substream->runtime; | |
359 | char *dst = runtime->dma_area; | |
360 | unsigned int dst_off = dpcm->buf_pos; | |
361 | ||
362 | if (dpcm->silent_size >= dpcm->pcm_buffer_size) | |
363 | return; | |
364 | if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) | |
365 | bytes = dpcm->pcm_buffer_size - dpcm->silent_size; | |
366 | ||
367 | for (;;) { | |
368 | unsigned int size = bytes; | |
369 | if (dst_off + size > dpcm->pcm_buffer_size) | |
370 | size = dpcm->pcm_buffer_size - dst_off; | |
371 | snd_pcm_format_set_silence(runtime->format, dst + dst_off, | |
372 | bytes_to_frames(runtime, size) * | |
373 | runtime->channels); | |
374 | dpcm->silent_size += size; | |
375 | bytes -= size; | |
376 | if (!bytes) | |
377 | break; | |
378 | dst_off = 0; | |
379 | } | |
380 | } | |
381 | ||
382 | static void copy_play_buf(struct loopback_pcm *play, | |
383 | struct loopback_pcm *capt, | |
384 | unsigned int bytes) | |
385 | { | |
386 | struct snd_pcm_runtime *runtime = play->substream->runtime; | |
20d9a26d | 387 | char *src = runtime->dma_area; |
597603d6 JK |
388 | char *dst = capt->substream->runtime->dma_area; |
389 | unsigned int src_off = play->buf_pos; | |
390 | unsigned int dst_off = capt->buf_pos; | |
391 | unsigned int clear_bytes = 0; | |
392 | ||
393 | /* check if playback is draining, trim the capture copy size | |
394 | * when our pointer is at the end of playback ring buffer */ | |
395 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && | |
396 | snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { | |
397 | snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; | |
398 | appl_ptr = appl_ptr1 = runtime->control->appl_ptr; | |
399 | appl_ptr1 -= appl_ptr1 % runtime->buffer_size; | |
400 | appl_ptr1 += play->buf_pos / play->pcm_salign; | |
401 | if (appl_ptr < appl_ptr1) | |
402 | appl_ptr1 -= runtime->buffer_size; | |
403 | diff = (appl_ptr - appl_ptr1) * play->pcm_salign; | |
404 | if (diff < bytes) { | |
405 | clear_bytes = bytes - diff; | |
406 | bytes = diff; | |
407 | } | |
408 | } | |
409 | ||
410 | for (;;) { | |
411 | unsigned int size = bytes; | |
412 | if (src_off + size > play->pcm_buffer_size) | |
413 | size = play->pcm_buffer_size - src_off; | |
414 | if (dst_off + size > capt->pcm_buffer_size) | |
415 | size = capt->pcm_buffer_size - dst_off; | |
416 | memcpy(dst + dst_off, src + src_off, size); | |
417 | capt->silent_size = 0; | |
418 | bytes -= size; | |
419 | if (!bytes) | |
420 | break; | |
421 | src_off = (src_off + size) % play->pcm_buffer_size; | |
422 | dst_off = (dst_off + size) % capt->pcm_buffer_size; | |
423 | } | |
424 | ||
20d9a26d | 425 | if (clear_bytes > 0) { |
597603d6 | 426 | clear_capture_buf(capt, clear_bytes); |
20d9a26d JK |
427 | capt->silent_size = 0; |
428 | } | |
597603d6 JK |
429 | } |
430 | ||
431 | #define BYTEPOS_UPDATE_POSONLY 0 | |
432 | #define BYTEPOS_UPDATE_CLEAR 1 | |
433 | #define BYTEPOS_UPDATE_COPY 2 | |
434 | ||
435 | static void loopback_bytepos_update(struct loopback_pcm *dpcm, | |
436 | unsigned int delta, | |
437 | unsigned int cmd) | |
438 | { | |
439 | unsigned int count; | |
440 | unsigned long last_pos; | |
441 | ||
442 | last_pos = byte_pos(dpcm, dpcm->irq_pos); | |
443 | dpcm->irq_pos += delta * dpcm->pcm_bps; | |
444 | count = byte_pos(dpcm, dpcm->irq_pos) - last_pos; | |
445 | if (!count) | |
446 | return; | |
447 | if (cmd == BYTEPOS_UPDATE_CLEAR) | |
448 | clear_capture_buf(dpcm, count); | |
449 | else if (cmd == BYTEPOS_UPDATE_COPY) | |
450 | copy_play_buf(dpcm->cable->streams[SNDRV_PCM_STREAM_PLAYBACK], | |
451 | dpcm->cable->streams[SNDRV_PCM_STREAM_CAPTURE], | |
452 | count); | |
453 | dpcm->buf_pos += count; | |
454 | dpcm->buf_pos %= dpcm->pcm_buffer_size; | |
455 | if (dpcm->irq_pos >= dpcm->period_size_frac) { | |
456 | dpcm->irq_pos %= dpcm->period_size_frac; | |
457 | dpcm->period_update_pending = 1; | |
458 | } | |
459 | } | |
460 | ||
dd04bb12 | 461 | static unsigned int loopback_pos_update(struct loopback_cable *cable) |
597603d6 JK |
462 | { |
463 | struct loopback_pcm *dpcm_play = | |
464 | cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; | |
465 | struct loopback_pcm *dpcm_capt = | |
466 | cable->streams[SNDRV_PCM_STREAM_CAPTURE]; | |
467 | unsigned long delta_play = 0, delta_capt = 0; | |
dd04bb12 | 468 | unsigned int running; |
597603d6 JK |
469 | |
470 | spin_lock(&cable->lock); | |
dd04bb12 JK |
471 | running = cable->running; |
472 | if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { | |
597603d6 JK |
473 | delta_play = jiffies - dpcm_play->last_jiffies; |
474 | dpcm_play->last_jiffies += delta_play; | |
475 | } | |
476 | ||
dd04bb12 | 477 | if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { |
597603d6 JK |
478 | delta_capt = jiffies - dpcm_capt->last_jiffies; |
479 | dpcm_capt->last_jiffies += delta_capt; | |
480 | } | |
481 | ||
482 | if (delta_play == 0 && delta_capt == 0) { | |
483 | spin_unlock(&cable->lock); | |
dd04bb12 | 484 | return running; |
597603d6 JK |
485 | } |
486 | ||
487 | if (delta_play > delta_capt) { | |
488 | loopback_bytepos_update(dpcm_play, delta_play - delta_capt, | |
489 | BYTEPOS_UPDATE_POSONLY); | |
490 | delta_play = delta_capt; | |
491 | } else if (delta_play < delta_capt) { | |
492 | loopback_bytepos_update(dpcm_capt, delta_capt - delta_play, | |
493 | BYTEPOS_UPDATE_CLEAR); | |
494 | delta_capt = delta_play; | |
495 | } | |
496 | ||
497 | if (delta_play == 0 && delta_capt == 0) { | |
498 | spin_unlock(&cable->lock); | |
dd04bb12 | 499 | return running; |
597603d6 JK |
500 | } |
501 | /* note delta_capt == delta_play at this moment */ | |
502 | loopback_bytepos_update(dpcm_capt, delta_capt, BYTEPOS_UPDATE_COPY); | |
503 | loopback_bytepos_update(dpcm_play, delta_play, BYTEPOS_UPDATE_POSONLY); | |
504 | spin_unlock(&cable->lock); | |
dd04bb12 | 505 | return running; |
597603d6 JK |
506 | } |
507 | ||
508 | static void loopback_timer_function(unsigned long data) | |
509 | { | |
510 | struct loopback_pcm *dpcm = (struct loopback_pcm *)data; | |
dd04bb12 | 511 | unsigned int running; |
597603d6 | 512 | |
dd04bb12 JK |
513 | running = loopback_pos_update(dpcm->cable); |
514 | if (running & (1 << dpcm->substream->stream)) { | |
597603d6 | 515 | loopback_timer_start(dpcm); |
dd04bb12 JK |
516 | if (dpcm->period_update_pending) { |
517 | dpcm->period_update_pending = 0; | |
597603d6 | 518 | snd_pcm_period_elapsed(dpcm->substream); |
dd04bb12 | 519 | } |
597603d6 JK |
520 | } |
521 | } | |
522 | ||
523 | static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) | |
524 | { | |
525 | struct snd_pcm_runtime *runtime = substream->runtime; | |
526 | struct loopback_pcm *dpcm = runtime->private_data; | |
527 | ||
528 | loopback_pos_update(dpcm->cable); | |
529 | return bytes_to_frames(runtime, dpcm->buf_pos); | |
530 | } | |
531 | ||
532 | static struct snd_pcm_hardware loopback_pcm_hardware = | |
533 | { | |
534 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | | |
535 | SNDRV_PCM_INFO_MMAP_VALID), | |
536 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | | |
537 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | | |
538 | SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), | |
539 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, | |
540 | .rate_min = 8000, | |
541 | .rate_max = 192000, | |
542 | .channels_min = 1, | |
543 | .channels_max = 32, | |
544 | .buffer_bytes_max = 2 * 1024 * 1024, | |
545 | .period_bytes_min = 64, | |
0db71023 JK |
546 | /* note check overflow in frac_pos() using pcm_rate_shift before |
547 | changing period_bytes_max value */ | |
548 | .period_bytes_max = 1024 * 1024, | |
597603d6 JK |
549 | .periods_min = 1, |
550 | .periods_max = 1024, | |
551 | .fifo_size = 0, | |
552 | }; | |
553 | ||
554 | static void loopback_runtime_free(struct snd_pcm_runtime *runtime) | |
555 | { | |
556 | struct loopback_pcm *dpcm = runtime->private_data; | |
557 | kfree(dpcm); | |
558 | } | |
559 | ||
560 | static int loopback_hw_params(struct snd_pcm_substream *substream, | |
561 | struct snd_pcm_hw_params *params) | |
562 | { | |
563 | return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
564 | } | |
565 | ||
566 | static int loopback_hw_free(struct snd_pcm_substream *substream) | |
567 | { | |
568 | struct snd_pcm_runtime *runtime = substream->runtime; | |
569 | struct loopback_pcm *dpcm = runtime->private_data; | |
570 | struct loopback_cable *cable = dpcm->cable; | |
571 | ||
572 | mutex_lock(&dpcm->loopback->cable_lock); | |
573 | cable->valid &= ~(1 << substream->stream); | |
574 | mutex_unlock(&dpcm->loopback->cable_lock); | |
575 | return snd_pcm_lib_free_pages(substream); | |
576 | } | |
577 | ||
578 | static unsigned int get_cable_index(struct snd_pcm_substream *substream) | |
579 | { | |
580 | if (!substream->pcm->device) | |
581 | return substream->stream; | |
582 | else | |
583 | return !substream->stream; | |
584 | } | |
585 | ||
b1c73fc8 JK |
586 | static int rule_format(struct snd_pcm_hw_params *params, |
587 | struct snd_pcm_hw_rule *rule) | |
588 | { | |
589 | ||
590 | struct snd_pcm_hardware *hw = rule->private; | |
591 | struct snd_mask *maskp = hw_param_mask(params, rule->var); | |
592 | ||
593 | maskp->bits[0] &= (u_int32_t)hw->formats; | |
594 | maskp->bits[1] &= (u_int32_t)(hw->formats >> 32); | |
595 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ | |
596 | if (! maskp->bits[0] && ! maskp->bits[1]) | |
597 | return -EINVAL; | |
598 | return 0; | |
599 | } | |
600 | ||
601 | static int rule_rate(struct snd_pcm_hw_params *params, | |
602 | struct snd_pcm_hw_rule *rule) | |
603 | { | |
604 | struct snd_pcm_hardware *hw = rule->private; | |
605 | struct snd_interval t; | |
606 | ||
607 | t.min = hw->rate_min; | |
608 | t.max = hw->rate_max; | |
609 | t.openmin = t.openmax = 0; | |
610 | t.integer = 0; | |
611 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
612 | } | |
613 | ||
614 | static int rule_channels(struct snd_pcm_hw_params *params, | |
615 | struct snd_pcm_hw_rule *rule) | |
616 | { | |
617 | struct snd_pcm_hardware *hw = rule->private; | |
618 | struct snd_interval t; | |
619 | ||
620 | t.min = hw->channels_min; | |
621 | t.max = hw->channels_max; | |
622 | t.openmin = t.openmax = 0; | |
623 | t.integer = 0; | |
624 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
625 | } | |
626 | ||
597603d6 JK |
627 | static int loopback_open(struct snd_pcm_substream *substream) |
628 | { | |
629 | struct snd_pcm_runtime *runtime = substream->runtime; | |
630 | struct loopback *loopback = substream->private_data; | |
631 | struct loopback_pcm *dpcm; | |
632 | struct loopback_cable *cable; | |
633 | int err = 0; | |
634 | int dev = get_cable_index(substream); | |
635 | ||
636 | mutex_lock(&loopback->cable_lock); | |
637 | dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); | |
638 | if (!dpcm) { | |
639 | err = -ENOMEM; | |
640 | goto unlock; | |
641 | } | |
642 | dpcm->loopback = loopback; | |
643 | dpcm->substream = substream; | |
644 | setup_timer(&dpcm->timer, loopback_timer_function, | |
645 | (unsigned long)dpcm); | |
646 | ||
647 | cable = loopback->cables[substream->number][dev]; | |
648 | if (!cable) { | |
649 | cable = kzalloc(sizeof(*cable), GFP_KERNEL); | |
650 | if (!cable) { | |
651 | kfree(dpcm); | |
652 | err = -ENOMEM; | |
653 | goto unlock; | |
654 | } | |
655 | spin_lock_init(&cable->lock); | |
656 | cable->hw = loopback_pcm_hardware; | |
657 | loopback->cables[substream->number][dev] = cable; | |
658 | } | |
659 | dpcm->cable = cable; | |
660 | cable->streams[substream->stream] = dpcm; | |
661 | ||
662 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
663 | ||
b1c73fc8 JK |
664 | /* use dynamic rules based on actual runtime->hw values */ |
665 | /* note that the default rules created in the PCM midlevel code */ | |
666 | /* are cached -> they do not reflect the actual state */ | |
667 | err = snd_pcm_hw_rule_add(runtime, 0, | |
668 | SNDRV_PCM_HW_PARAM_FORMAT, | |
669 | rule_format, &runtime->hw, | |
670 | SNDRV_PCM_HW_PARAM_FORMAT, -1); | |
671 | if (err < 0) | |
672 | goto unlock; | |
673 | err = snd_pcm_hw_rule_add(runtime, 0, | |
674 | SNDRV_PCM_HW_PARAM_RATE, | |
675 | rule_rate, &runtime->hw, | |
676 | SNDRV_PCM_HW_PARAM_RATE, -1); | |
677 | if (err < 0) | |
678 | goto unlock; | |
679 | err = snd_pcm_hw_rule_add(runtime, 0, | |
680 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
681 | rule_channels, &runtime->hw, | |
682 | SNDRV_PCM_HW_PARAM_CHANNELS, -1); | |
683 | if (err < 0) | |
684 | goto unlock; | |
685 | ||
597603d6 JK |
686 | runtime->private_data = dpcm; |
687 | runtime->private_free = loopback_runtime_free; | |
b1c73fc8 | 688 | if (get_notify(dpcm)) |
597603d6 | 689 | runtime->hw = loopback_pcm_hardware; |
b1c73fc8 | 690 | else |
597603d6 | 691 | runtime->hw = cable->hw; |
597603d6 JK |
692 | unlock: |
693 | mutex_unlock(&loopback->cable_lock); | |
694 | return err; | |
695 | } | |
696 | ||
697 | static int loopback_close(struct snd_pcm_substream *substream) | |
698 | { | |
699 | struct loopback *loopback = substream->private_data; | |
700 | struct loopback_pcm *dpcm = substream->runtime->private_data; | |
701 | struct loopback_cable *cable; | |
702 | int dev = get_cable_index(substream); | |
703 | ||
704 | loopback_timer_stop(dpcm); | |
705 | mutex_lock(&loopback->cable_lock); | |
706 | cable = loopback->cables[substream->number][dev]; | |
707 | if (cable->streams[!substream->stream]) { | |
708 | /* other stream is still alive */ | |
709 | cable->streams[substream->stream] = NULL; | |
710 | } else { | |
711 | /* free the cable */ | |
712 | loopback->cables[substream->number][dev] = NULL; | |
713 | kfree(cable); | |
714 | } | |
715 | mutex_unlock(&loopback->cable_lock); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static struct snd_pcm_ops loopback_playback_ops = { | |
720 | .open = loopback_open, | |
721 | .close = loopback_close, | |
722 | .ioctl = snd_pcm_lib_ioctl, | |
723 | .hw_params = loopback_hw_params, | |
724 | .hw_free = loopback_hw_free, | |
725 | .prepare = loopback_prepare, | |
726 | .trigger = loopback_trigger, | |
727 | .pointer = loopback_pointer, | |
728 | }; | |
729 | ||
730 | static struct snd_pcm_ops loopback_capture_ops = { | |
731 | .open = loopback_open, | |
732 | .close = loopback_close, | |
733 | .ioctl = snd_pcm_lib_ioctl, | |
734 | .hw_params = loopback_hw_params, | |
735 | .hw_free = loopback_hw_free, | |
736 | .prepare = loopback_prepare, | |
737 | .trigger = loopback_trigger, | |
738 | .pointer = loopback_pointer, | |
739 | }; | |
740 | ||
741 | static int __devinit loopback_pcm_new(struct loopback *loopback, | |
742 | int device, int substreams) | |
743 | { | |
744 | struct snd_pcm *pcm; | |
745 | int err; | |
746 | ||
747 | err = snd_pcm_new(loopback->card, "Loopback PCM", device, | |
748 | substreams, substreams, &pcm); | |
749 | if (err < 0) | |
750 | return err; | |
751 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); | |
752 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); | |
753 | ||
754 | pcm->private_data = loopback; | |
755 | pcm->info_flags = 0; | |
756 | strcpy(pcm->name, "Loopback PCM"); | |
757 | ||
758 | loopback->pcm[device] = pcm; | |
759 | ||
760 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, | |
761 | snd_dma_continuous_data(GFP_KERNEL), | |
762 | 0, 2 * 1024 * 1024); | |
763 | return 0; | |
764 | } | |
765 | ||
766 | static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, | |
767 | struct snd_ctl_elem_info *uinfo) | |
768 | { | |
769 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
770 | uinfo->count = 1; | |
771 | uinfo->value.integer.min = 80000; | |
772 | uinfo->value.integer.max = 120000; | |
773 | uinfo->value.integer.step = 1; | |
774 | return 0; | |
775 | } | |
776 | ||
777 | static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, | |
778 | struct snd_ctl_elem_value *ucontrol) | |
779 | { | |
780 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
781 | ||
782 | ucontrol->value.integer.value[0] = | |
783 | loopback->setup[kcontrol->id.subdevice] | |
784 | [kcontrol->id.device].rate_shift; | |
785 | return 0; | |
786 | } | |
787 | ||
788 | static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, | |
789 | struct snd_ctl_elem_value *ucontrol) | |
790 | { | |
791 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
792 | unsigned int val; | |
793 | int change = 0; | |
794 | ||
795 | val = ucontrol->value.integer.value[0]; | |
796 | if (val < 80000) | |
797 | val = 80000; | |
798 | if (val > 120000) | |
799 | val = 120000; | |
800 | mutex_lock(&loopback->cable_lock); | |
801 | if (val != loopback->setup[kcontrol->id.subdevice] | |
802 | [kcontrol->id.device].rate_shift) { | |
803 | loopback->setup[kcontrol->id.subdevice] | |
804 | [kcontrol->id.device].rate_shift = val; | |
805 | change = 1; | |
806 | } | |
807 | mutex_unlock(&loopback->cable_lock); | |
808 | return change; | |
809 | } | |
810 | ||
811 | static int loopback_notify_get(struct snd_kcontrol *kcontrol, | |
812 | struct snd_ctl_elem_value *ucontrol) | |
813 | { | |
814 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
815 | ||
816 | ucontrol->value.integer.value[0] = | |
817 | loopback->setup[kcontrol->id.subdevice] | |
818 | [kcontrol->id.device].notify; | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static int loopback_notify_put(struct snd_kcontrol *kcontrol, | |
823 | struct snd_ctl_elem_value *ucontrol) | |
824 | { | |
825 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
826 | unsigned int val; | |
827 | int change = 0; | |
828 | ||
829 | val = ucontrol->value.integer.value[0] ? 1 : 0; | |
830 | if (val != loopback->setup[kcontrol->id.subdevice] | |
831 | [kcontrol->id.device].notify) { | |
832 | loopback->setup[kcontrol->id.subdevice] | |
833 | [kcontrol->id.device].notify = val; | |
834 | change = 1; | |
835 | } | |
836 | return change; | |
837 | } | |
838 | ||
839 | static int loopback_active_get(struct snd_kcontrol *kcontrol, | |
840 | struct snd_ctl_elem_value *ucontrol) | |
841 | { | |
842 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
843 | struct loopback_cable *cable = loopback->cables | |
ac446fb7 | 844 | [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; |
597603d6 JK |
845 | unsigned int val = 0; |
846 | ||
847 | if (cable != NULL) | |
848 | val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? | |
849 | 1 : 0; | |
850 | ucontrol->value.integer.value[0] = val; | |
851 | return 0; | |
852 | } | |
853 | ||
854 | static int loopback_format_info(struct snd_kcontrol *kcontrol, | |
855 | struct snd_ctl_elem_info *uinfo) | |
856 | { | |
857 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
858 | uinfo->count = 1; | |
859 | uinfo->value.integer.min = 0; | |
860 | uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; | |
861 | uinfo->value.integer.step = 1; | |
862 | return 0; | |
863 | } | |
864 | ||
865 | static int loopback_format_get(struct snd_kcontrol *kcontrol, | |
866 | struct snd_ctl_elem_value *ucontrol) | |
867 | { | |
868 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
869 | ||
870 | ucontrol->value.integer.value[0] = | |
871 | loopback->setup[kcontrol->id.subdevice] | |
872 | [kcontrol->id.device].format; | |
873 | return 0; | |
874 | } | |
875 | ||
876 | static int loopback_rate_info(struct snd_kcontrol *kcontrol, | |
877 | struct snd_ctl_elem_info *uinfo) | |
878 | { | |
879 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
880 | uinfo->count = 1; | |
881 | uinfo->value.integer.min = 0; | |
882 | uinfo->value.integer.max = 192000; | |
883 | uinfo->value.integer.step = 1; | |
884 | return 0; | |
885 | } | |
886 | ||
887 | static int loopback_rate_get(struct snd_kcontrol *kcontrol, | |
888 | struct snd_ctl_elem_value *ucontrol) | |
889 | { | |
890 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
891 | ||
892 | ucontrol->value.integer.value[0] = | |
893 | loopback->setup[kcontrol->id.subdevice] | |
894 | [kcontrol->id.device].rate; | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static int loopback_channels_info(struct snd_kcontrol *kcontrol, | |
899 | struct snd_ctl_elem_info *uinfo) | |
900 | { | |
901 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
902 | uinfo->count = 1; | |
903 | uinfo->value.integer.min = 1; | |
904 | uinfo->value.integer.max = 1024; | |
905 | uinfo->value.integer.step = 1; | |
906 | return 0; | |
907 | } | |
908 | ||
909 | static int loopback_channels_get(struct snd_kcontrol *kcontrol, | |
910 | struct snd_ctl_elem_value *ucontrol) | |
911 | { | |
912 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
913 | ||
914 | ucontrol->value.integer.value[0] = | |
915 | loopback->setup[kcontrol->id.subdevice] | |
1446c5fb | 916 | [kcontrol->id.device].channels; |
597603d6 JK |
917 | return 0; |
918 | } | |
919 | ||
920 | static struct snd_kcontrol_new loopback_controls[] __devinitdata = { | |
921 | { | |
922 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
923 | .name = "PCM Rate Shift 100000", | |
924 | .info = loopback_rate_shift_info, | |
925 | .get = loopback_rate_shift_get, | |
926 | .put = loopback_rate_shift_put, | |
927 | }, | |
928 | { | |
929 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
930 | .name = "PCM Notify", | |
931 | .info = snd_ctl_boolean_mono_info, | |
932 | .get = loopback_notify_get, | |
933 | .put = loopback_notify_put, | |
934 | }, | |
935 | #define ACTIVE_IDX 2 | |
936 | { | |
937 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
938 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
939 | .name = "PCM Slave Active", | |
940 | .info = snd_ctl_boolean_mono_info, | |
941 | .get = loopback_active_get, | |
942 | }, | |
943 | #define FORMAT_IDX 3 | |
944 | { | |
945 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
946 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
947 | .name = "PCM Slave Format", | |
948 | .info = loopback_format_info, | |
949 | .get = loopback_format_get | |
950 | }, | |
951 | #define RATE_IDX 4 | |
952 | { | |
953 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
954 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
955 | .name = "PCM Slave Rate", | |
956 | .info = loopback_rate_info, | |
957 | .get = loopback_rate_get | |
958 | }, | |
959 | #define CHANNELS_IDX 5 | |
960 | { | |
961 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
962 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
963 | .name = "PCM Slave Channels", | |
964 | .info = loopback_channels_info, | |
965 | .get = loopback_channels_get | |
966 | } | |
967 | }; | |
968 | ||
969 | static int __devinit loopback_mixer_new(struct loopback *loopback, int notify) | |
970 | { | |
971 | struct snd_card *card = loopback->card; | |
972 | struct snd_pcm *pcm; | |
973 | struct snd_kcontrol *kctl; | |
974 | struct loopback_setup *setup; | |
975 | int err, dev, substr, substr_count, idx; | |
976 | ||
977 | strcpy(card->mixername, "Loopback Mixer"); | |
978 | for (dev = 0; dev < 2; dev++) { | |
979 | pcm = loopback->pcm[dev]; | |
980 | substr_count = | |
981 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; | |
982 | for (substr = 0; substr < substr_count; substr++) { | |
983 | setup = &loopback->setup[substr][dev]; | |
984 | setup->notify = notify; | |
985 | setup->rate_shift = NO_PITCH; | |
986 | setup->format = SNDRV_PCM_FORMAT_S16_LE; | |
987 | setup->rate = 48000; | |
988 | setup->channels = 2; | |
989 | for (idx = 0; idx < ARRAY_SIZE(loopback_controls); | |
990 | idx++) { | |
991 | kctl = snd_ctl_new1(&loopback_controls[idx], | |
992 | loopback); | |
993 | if (!kctl) | |
994 | return -ENOMEM; | |
995 | kctl->id.device = dev; | |
996 | kctl->id.subdevice = substr; | |
997 | switch (idx) { | |
998 | case ACTIVE_IDX: | |
999 | setup->active_id = kctl->id; | |
1000 | break; | |
1001 | case FORMAT_IDX: | |
1002 | setup->format_id = kctl->id; | |
1003 | break; | |
1004 | case RATE_IDX: | |
1005 | setup->rate_id = kctl->id; | |
1006 | break; | |
1007 | case CHANNELS_IDX: | |
1008 | setup->channels_id = kctl->id; | |
1009 | break; | |
1010 | default: | |
1011 | break; | |
1012 | } | |
1013 | err = snd_ctl_add(card, kctl); | |
1014 | if (err < 0) | |
1015 | return err; | |
1016 | } | |
1017 | } | |
1018 | } | |
1019 | return 0; | |
1020 | } | |
1021 | ||
e74670b6 JK |
1022 | #ifdef CONFIG_PROC_FS |
1023 | ||
1024 | static void print_dpcm_info(struct snd_info_buffer *buffer, | |
1025 | struct loopback_pcm *dpcm, | |
1026 | const char *id) | |
1027 | { | |
1028 | snd_iprintf(buffer, " %s\n", id); | |
1029 | if (dpcm == NULL) { | |
1030 | snd_iprintf(buffer, " inactive\n"); | |
1031 | return; | |
1032 | } | |
1033 | snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); | |
1034 | snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); | |
1035 | snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); | |
1036 | snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); | |
1037 | snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); | |
1038 | snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); | |
1039 | snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); | |
1040 | snd_iprintf(buffer, " update_pending:\t%u\n", | |
1041 | dpcm->period_update_pending); | |
1042 | snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); | |
1043 | snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); | |
1044 | snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", | |
1045 | dpcm->last_jiffies, jiffies); | |
1046 | snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); | |
1047 | } | |
1048 | ||
1049 | static void print_substream_info(struct snd_info_buffer *buffer, | |
1050 | struct loopback *loopback, | |
1051 | int sub, | |
1052 | int num) | |
1053 | { | |
1054 | struct loopback_cable *cable = loopback->cables[sub][num]; | |
1055 | ||
1056 | snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); | |
1057 | if (cable == NULL) { | |
1058 | snd_iprintf(buffer, " inactive\n"); | |
1059 | return; | |
1060 | } | |
1061 | snd_iprintf(buffer, " valid: %u\n", cable->valid); | |
1062 | snd_iprintf(buffer, " running: %u\n", cable->running); | |
1063 | print_dpcm_info(buffer, cable->streams[0], "Playback"); | |
1064 | print_dpcm_info(buffer, cable->streams[1], "Capture"); | |
1065 | } | |
1066 | ||
1067 | static void print_cable_info(struct snd_info_entry *entry, | |
1068 | struct snd_info_buffer *buffer) | |
1069 | { | |
1070 | struct loopback *loopback = entry->private_data; | |
1071 | int sub, num; | |
1072 | ||
1073 | mutex_lock(&loopback->cable_lock); | |
1074 | num = entry->name[strlen(entry->name)-1]; | |
1075 | num = num == '0' ? 0 : 1; | |
1076 | for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) | |
1077 | print_substream_info(buffer, loopback, sub, num); | |
1078 | mutex_unlock(&loopback->cable_lock); | |
1079 | } | |
1080 | ||
1081 | static int __devinit loopback_proc_new(struct loopback *loopback, int cidx) | |
1082 | { | |
1083 | char name[32]; | |
1084 | struct snd_info_entry *entry; | |
1085 | int err; | |
1086 | ||
1087 | snprintf(name, sizeof(name), "cable#%d", cidx); | |
1088 | err = snd_card_proc_new(loopback->card, name, &entry); | |
1089 | if (err < 0) | |
1090 | return err; | |
1091 | ||
1092 | snd_info_set_text_ops(entry, loopback, print_cable_info); | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | #else /* !CONFIG_PROC_FS */ | |
1097 | ||
1098 | #define loopback_proc_new(loopback, cidx) do { } while (0) | |
1099 | ||
1100 | #endif | |
1101 | ||
597603d6 JK |
1102 | static int __devinit loopback_probe(struct platform_device *devptr) |
1103 | { | |
1104 | struct snd_card *card; | |
1105 | struct loopback *loopback; | |
1106 | int dev = devptr->id; | |
1107 | int err; | |
1108 | ||
1109 | err = snd_card_create(index[dev], id[dev], THIS_MODULE, | |
1110 | sizeof(struct loopback), &card); | |
1111 | if (err < 0) | |
1112 | return err; | |
1113 | loopback = card->private_data; | |
1114 | ||
1115 | if (pcm_substreams[dev] < 1) | |
1116 | pcm_substreams[dev] = 1; | |
1117 | if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) | |
1118 | pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; | |
1119 | ||
1120 | loopback->card = card; | |
1121 | mutex_init(&loopback->cable_lock); | |
1122 | ||
1123 | err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); | |
1124 | if (err < 0) | |
1125 | goto __nodev; | |
1126 | err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); | |
1127 | if (err < 0) | |
1128 | goto __nodev; | |
1129 | err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); | |
1130 | if (err < 0) | |
1131 | goto __nodev; | |
e74670b6 JK |
1132 | loopback_proc_new(loopback, 0); |
1133 | loopback_proc_new(loopback, 1); | |
597603d6 JK |
1134 | strcpy(card->driver, "Loopback"); |
1135 | strcpy(card->shortname, "Loopback"); | |
1136 | sprintf(card->longname, "Loopback %i", dev + 1); | |
1137 | err = snd_card_register(card); | |
1138 | if (!err) { | |
1139 | platform_set_drvdata(devptr, card); | |
1140 | return 0; | |
1141 | } | |
1142 | __nodev: | |
1143 | snd_card_free(card); | |
1144 | return err; | |
1145 | } | |
1146 | ||
1147 | static int __devexit loopback_remove(struct platform_device *devptr) | |
1148 | { | |
1149 | snd_card_free(platform_get_drvdata(devptr)); | |
1150 | platform_set_drvdata(devptr, NULL); | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | #ifdef CONFIG_PM | |
1155 | static int loopback_suspend(struct platform_device *pdev, | |
1156 | pm_message_t state) | |
1157 | { | |
1158 | struct snd_card *card = platform_get_drvdata(pdev); | |
1159 | struct loopback *loopback = card->private_data; | |
1160 | ||
1161 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
1162 | ||
1163 | snd_pcm_suspend_all(loopback->pcm[0]); | |
1164 | snd_pcm_suspend_all(loopback->pcm[1]); | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | static int loopback_resume(struct platform_device *pdev) | |
1169 | { | |
1170 | struct snd_card *card = platform_get_drvdata(pdev); | |
1171 | ||
1172 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
1173 | return 0; | |
1174 | } | |
1175 | #endif | |
1176 | ||
1177 | #define SND_LOOPBACK_DRIVER "snd_aloop" | |
1178 | ||
1179 | static struct platform_driver loopback_driver = { | |
1180 | .probe = loopback_probe, | |
1181 | .remove = __devexit_p(loopback_remove), | |
1182 | #ifdef CONFIG_PM | |
1183 | .suspend = loopback_suspend, | |
1184 | .resume = loopback_resume, | |
1185 | #endif | |
1186 | .driver = { | |
1187 | .name = SND_LOOPBACK_DRIVER | |
1188 | }, | |
1189 | }; | |
1190 | ||
1191 | static void loopback_unregister_all(void) | |
1192 | { | |
1193 | int i; | |
1194 | ||
1195 | for (i = 0; i < ARRAY_SIZE(devices); ++i) | |
1196 | platform_device_unregister(devices[i]); | |
1197 | platform_driver_unregister(&loopback_driver); | |
1198 | } | |
1199 | ||
1200 | static int __init alsa_card_loopback_init(void) | |
1201 | { | |
1202 | int i, err, cards; | |
1203 | ||
1204 | err = platform_driver_register(&loopback_driver); | |
1205 | if (err < 0) | |
1206 | return err; | |
1207 | ||
1208 | ||
1209 | cards = 0; | |
1210 | for (i = 0; i < SNDRV_CARDS; i++) { | |
1211 | struct platform_device *device; | |
1212 | if (!enable[i]) | |
1213 | continue; | |
1214 | device = platform_device_register_simple(SND_LOOPBACK_DRIVER, | |
1215 | i, NULL, 0); | |
1216 | if (IS_ERR(device)) | |
1217 | continue; | |
1218 | if (!platform_get_drvdata(device)) { | |
1219 | platform_device_unregister(device); | |
1220 | continue; | |
1221 | } | |
1222 | devices[i] = device; | |
1223 | cards++; | |
1224 | } | |
1225 | if (!cards) { | |
1226 | #ifdef MODULE | |
1227 | printk(KERN_ERR "aloop: No loopback enabled\n"); | |
1228 | #endif | |
1229 | loopback_unregister_all(); | |
1230 | return -ENODEV; | |
1231 | } | |
1232 | return 0; | |
1233 | } | |
1234 | ||
1235 | static void __exit alsa_card_loopback_exit(void) | |
1236 | { | |
1237 | loopback_unregister_all(); | |
1238 | } | |
1239 | ||
1240 | module_init(alsa_card_loopback_init) | |
1241 | module_exit(alsa_card_loopback_exit) |