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Commit | Line | Data |
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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; | |
123 | }; | |
124 | ||
125 | static struct platform_device *devices[SNDRV_CARDS]; | |
126 | ||
127 | static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) | |
128 | { | |
129 | if (dpcm->pcm_rate_shift == NO_PITCH) { | |
130 | x /= HZ; | |
131 | } else { | |
132 | x = div_u64(NO_PITCH * (unsigned long long)x, | |
133 | HZ * (unsigned long long)dpcm->pcm_rate_shift); | |
134 | } | |
135 | return x - (x % dpcm->pcm_salign); | |
136 | } | |
137 | ||
138 | static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) | |
139 | { | |
140 | if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ | |
141 | return x * HZ; | |
142 | } else { | |
143 | x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, | |
144 | NO_PITCH); | |
145 | } | |
146 | return x; | |
147 | } | |
148 | ||
149 | static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) | |
150 | { | |
151 | int device = dpcm->substream->pstr->pcm->device; | |
152 | ||
153 | if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
154 | device ^= 1; | |
155 | return &dpcm->loopback->setup[dpcm->substream->number][device]; | |
156 | } | |
157 | ||
158 | static inline unsigned int get_notify(struct loopback_pcm *dpcm) | |
159 | { | |
160 | return get_setup(dpcm)->notify; | |
161 | } | |
162 | ||
163 | static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) | |
164 | { | |
165 | return get_setup(dpcm)->rate_shift; | |
166 | } | |
167 | ||
168 | static void loopback_timer_start(struct loopback_pcm *dpcm) | |
169 | { | |
170 | unsigned long tick; | |
171 | unsigned int rate_shift = get_rate_shift(dpcm); | |
172 | ||
173 | if (rate_shift != dpcm->pcm_rate_shift) { | |
174 | dpcm->pcm_rate_shift = rate_shift; | |
175 | dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); | |
176 | } | |
0db71023 JK |
177 | if (dpcm->period_size_frac <= dpcm->irq_pos) { |
178 | dpcm->irq_pos %= dpcm->period_size_frac; | |
179 | dpcm->period_update_pending = 1; | |
180 | } | |
597603d6 JK |
181 | tick = dpcm->period_size_frac - dpcm->irq_pos; |
182 | tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; | |
183 | dpcm->timer.expires = jiffies + tick; | |
184 | add_timer(&dpcm->timer); | |
185 | } | |
186 | ||
187 | static inline void loopback_timer_stop(struct loopback_pcm *dpcm) | |
188 | { | |
189 | del_timer(&dpcm->timer); | |
e74670b6 | 190 | dpcm->timer.expires = 0; |
597603d6 JK |
191 | } |
192 | ||
193 | #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) | |
194 | #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) | |
195 | #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) | |
196 | ||
197 | static int loopback_check_format(struct loopback_cable *cable, int stream) | |
198 | { | |
b1c73fc8 | 199 | struct snd_pcm_runtime *runtime, *cruntime; |
597603d6 JK |
200 | struct loopback_setup *setup; |
201 | struct snd_card *card; | |
202 | int check; | |
203 | ||
204 | if (cable->valid != CABLE_VALID_BOTH) { | |
205 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) | |
206 | goto __notify; | |
207 | return 0; | |
208 | } | |
209 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
210 | substream->runtime; | |
b1c73fc8 JK |
211 | cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> |
212 | substream->runtime; | |
213 | check = runtime->format != cruntime->format || | |
214 | runtime->rate != cruntime->rate || | |
215 | runtime->channels != cruntime->channels; | |
597603d6 JK |
216 | if (!check) |
217 | return 0; | |
218 | if (stream == SNDRV_PCM_STREAM_CAPTURE) { | |
219 | return -EIO; | |
220 | } else { | |
221 | snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> | |
222 | substream, SNDRV_PCM_STATE_DRAINING); | |
223 | __notify: | |
224 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
225 | substream->runtime; | |
226 | setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); | |
227 | card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; | |
228 | if (setup->format != runtime->format) { | |
229 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
230 | &setup->format_id); | |
231 | setup->format = runtime->format; | |
232 | } | |
233 | if (setup->rate != runtime->rate) { | |
234 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
235 | &setup->rate_id); | |
236 | setup->rate = runtime->rate; | |
237 | } | |
238 | if (setup->channels != runtime->channels) { | |
239 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
240 | &setup->channels_id); | |
241 | setup->channels = runtime->channels; | |
242 | } | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static void loopback_active_notify(struct loopback_pcm *dpcm) | |
248 | { | |
249 | snd_ctl_notify(dpcm->loopback->card, | |
250 | SNDRV_CTL_EVENT_MASK_VALUE, | |
251 | &get_setup(dpcm)->active_id); | |
252 | } | |
253 | ||
254 | static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) | |
255 | { | |
256 | struct snd_pcm_runtime *runtime = substream->runtime; | |
257 | struct loopback_pcm *dpcm = runtime->private_data; | |
258 | struct loopback_cable *cable = dpcm->cable; | |
5de9e45f | 259 | int err, stream = 1 << substream->stream; |
597603d6 JK |
260 | |
261 | switch (cmd) { | |
262 | case SNDRV_PCM_TRIGGER_START: | |
263 | err = loopback_check_format(cable, substream->stream); | |
264 | if (err < 0) | |
265 | return err; | |
266 | dpcm->last_jiffies = jiffies; | |
267 | dpcm->pcm_rate_shift = 0; | |
b012513c | 268 | dpcm->last_drift = 0; |
dd04bb12 | 269 | spin_lock(&cable->lock); |
5de9e45f JK |
270 | cable->running |= stream; |
271 | cable->pause &= ~stream; | |
dd04bb12 JK |
272 | spin_unlock(&cable->lock); |
273 | loopback_timer_start(dpcm); | |
597603d6 JK |
274 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
275 | loopback_active_notify(dpcm); | |
276 | break; | |
277 | case SNDRV_PCM_TRIGGER_STOP: | |
dd04bb12 | 278 | spin_lock(&cable->lock); |
5de9e45f JK |
279 | cable->running &= ~stream; |
280 | cable->pause &= ~stream; | |
dd04bb12 | 281 | spin_unlock(&cable->lock); |
597603d6 JK |
282 | loopback_timer_stop(dpcm); |
283 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
284 | loopback_active_notify(dpcm); | |
285 | break; | |
5de9e45f JK |
286 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
287 | spin_lock(&cable->lock); | |
288 | cable->pause |= stream; | |
289 | spin_unlock(&cable->lock); | |
290 | loopback_timer_stop(dpcm); | |
291 | break; | |
292 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
293 | spin_lock(&cable->lock); | |
294 | dpcm->last_jiffies = jiffies; | |
295 | cable->pause &= ~stream; | |
296 | spin_unlock(&cable->lock); | |
297 | loopback_timer_start(dpcm); | |
298 | break; | |
597603d6 JK |
299 | default: |
300 | return -EINVAL; | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
b1c73fc8 JK |
305 | static void params_change_substream(struct loopback_pcm *dpcm, |
306 | struct snd_pcm_runtime *runtime) | |
307 | { | |
308 | struct snd_pcm_runtime *dst_runtime; | |
309 | ||
310 | if (dpcm == NULL || dpcm->substream == NULL) | |
311 | return; | |
312 | dst_runtime = dpcm->substream->runtime; | |
313 | if (dst_runtime == NULL) | |
314 | return; | |
315 | dst_runtime->hw = dpcm->cable->hw; | |
316 | } | |
317 | ||
318 | static void params_change(struct snd_pcm_substream *substream) | |
319 | { | |
320 | struct snd_pcm_runtime *runtime = substream->runtime; | |
321 | struct loopback_pcm *dpcm = runtime->private_data; | |
322 | struct loopback_cable *cable = dpcm->cable; | |
323 | ||
324 | cable->hw.formats = (1ULL << runtime->format); | |
325 | cable->hw.rate_min = runtime->rate; | |
326 | cable->hw.rate_max = runtime->rate; | |
327 | cable->hw.channels_min = runtime->channels; | |
328 | cable->hw.channels_max = runtime->channels; | |
329 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK], | |
330 | runtime); | |
331 | params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE], | |
332 | runtime); | |
333 | } | |
334 | ||
597603d6 JK |
335 | static int loopback_prepare(struct snd_pcm_substream *substream) |
336 | { | |
337 | struct snd_pcm_runtime *runtime = substream->runtime; | |
338 | struct loopback_pcm *dpcm = runtime->private_data; | |
339 | struct loopback_cable *cable = dpcm->cable; | |
b1c73fc8 | 340 | int bps, salign; |
597603d6 JK |
341 | |
342 | salign = (snd_pcm_format_width(runtime->format) * | |
343 | runtime->channels) / 8; | |
344 | bps = salign * runtime->rate; | |
345 | if (bps <= 0 || salign <= 0) | |
346 | return -EINVAL; | |
347 | ||
348 | dpcm->buf_pos = 0; | |
349 | dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); | |
350 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { | |
351 | /* clear capture buffer */ | |
352 | dpcm->silent_size = dpcm->pcm_buffer_size; | |
353 | snd_pcm_format_set_silence(runtime->format, runtime->dma_area, | |
354 | runtime->buffer_size * runtime->channels); | |
355 | } | |
356 | ||
357 | dpcm->irq_pos = 0; | |
358 | dpcm->period_update_pending = 0; | |
359 | dpcm->pcm_bps = bps; | |
360 | dpcm->pcm_salign = salign; | |
361 | dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); | |
362 | ||
363 | mutex_lock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
364 | if (!(cable->valid & ~(1 << substream->stream)) || |
365 | (get_setup(dpcm)->notify && | |
366 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) | |
367 | params_change(substream); | |
597603d6 JK |
368 | cable->valid |= 1 << substream->stream; |
369 | mutex_unlock(&dpcm->loopback->cable_lock); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) | |
375 | { | |
376 | struct snd_pcm_runtime *runtime = dpcm->substream->runtime; | |
377 | char *dst = runtime->dma_area; | |
378 | unsigned int dst_off = dpcm->buf_pos; | |
379 | ||
380 | if (dpcm->silent_size >= dpcm->pcm_buffer_size) | |
381 | return; | |
382 | if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) | |
383 | bytes = dpcm->pcm_buffer_size - dpcm->silent_size; | |
384 | ||
385 | for (;;) { | |
386 | unsigned int size = bytes; | |
387 | if (dst_off + size > dpcm->pcm_buffer_size) | |
388 | size = dpcm->pcm_buffer_size - dst_off; | |
389 | snd_pcm_format_set_silence(runtime->format, dst + dst_off, | |
390 | bytes_to_frames(runtime, size) * | |
391 | runtime->channels); | |
392 | dpcm->silent_size += size; | |
393 | bytes -= size; | |
394 | if (!bytes) | |
395 | break; | |
396 | dst_off = 0; | |
397 | } | |
398 | } | |
399 | ||
400 | static void copy_play_buf(struct loopback_pcm *play, | |
401 | struct loopback_pcm *capt, | |
402 | unsigned int bytes) | |
403 | { | |
404 | struct snd_pcm_runtime *runtime = play->substream->runtime; | |
20d9a26d | 405 | char *src = runtime->dma_area; |
597603d6 JK |
406 | char *dst = capt->substream->runtime->dma_area; |
407 | unsigned int src_off = play->buf_pos; | |
408 | unsigned int dst_off = capt->buf_pos; | |
409 | unsigned int clear_bytes = 0; | |
410 | ||
411 | /* check if playback is draining, trim the capture copy size | |
412 | * when our pointer is at the end of playback ring buffer */ | |
413 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && | |
414 | snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { | |
415 | snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; | |
416 | appl_ptr = appl_ptr1 = runtime->control->appl_ptr; | |
417 | appl_ptr1 -= appl_ptr1 % runtime->buffer_size; | |
418 | appl_ptr1 += play->buf_pos / play->pcm_salign; | |
419 | if (appl_ptr < appl_ptr1) | |
420 | appl_ptr1 -= runtime->buffer_size; | |
421 | diff = (appl_ptr - appl_ptr1) * play->pcm_salign; | |
422 | if (diff < bytes) { | |
423 | clear_bytes = bytes - diff; | |
424 | bytes = diff; | |
425 | } | |
426 | } | |
427 | ||
428 | for (;;) { | |
429 | unsigned int size = bytes; | |
430 | if (src_off + size > play->pcm_buffer_size) | |
431 | size = play->pcm_buffer_size - src_off; | |
432 | if (dst_off + size > capt->pcm_buffer_size) | |
433 | size = capt->pcm_buffer_size - dst_off; | |
434 | memcpy(dst + dst_off, src + src_off, size); | |
435 | capt->silent_size = 0; | |
436 | bytes -= size; | |
437 | if (!bytes) | |
438 | break; | |
439 | src_off = (src_off + size) % play->pcm_buffer_size; | |
440 | dst_off = (dst_off + size) % capt->pcm_buffer_size; | |
441 | } | |
442 | ||
20d9a26d | 443 | if (clear_bytes > 0) { |
597603d6 | 444 | clear_capture_buf(capt, clear_bytes); |
20d9a26d JK |
445 | capt->silent_size = 0; |
446 | } | |
597603d6 JK |
447 | } |
448 | ||
b012513c JK |
449 | static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, |
450 | unsigned int jiffies_delta) | |
597603d6 | 451 | { |
597603d6 | 452 | unsigned long last_pos; |
b012513c | 453 | unsigned int delta; |
597603d6 JK |
454 | |
455 | last_pos = byte_pos(dpcm, dpcm->irq_pos); | |
b012513c JK |
456 | dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; |
457 | delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; | |
458 | if (delta >= dpcm->last_drift) | |
459 | delta -= dpcm->last_drift; | |
460 | dpcm->last_drift = 0; | |
597603d6 JK |
461 | if (dpcm->irq_pos >= dpcm->period_size_frac) { |
462 | dpcm->irq_pos %= dpcm->period_size_frac; | |
463 | dpcm->period_update_pending = 1; | |
464 | } | |
b012513c JK |
465 | return delta; |
466 | } | |
467 | ||
468 | static inline void bytepos_finish(struct loopback_pcm *dpcm, | |
469 | unsigned int delta) | |
470 | { | |
471 | dpcm->buf_pos += delta; | |
472 | dpcm->buf_pos %= dpcm->pcm_buffer_size; | |
597603d6 JK |
473 | } |
474 | ||
dd04bb12 | 475 | static unsigned int loopback_pos_update(struct loopback_cable *cable) |
597603d6 JK |
476 | { |
477 | struct loopback_pcm *dpcm_play = | |
478 | cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; | |
479 | struct loopback_pcm *dpcm_capt = | |
480 | cable->streams[SNDRV_PCM_STREAM_CAPTURE]; | |
481 | unsigned long delta_play = 0, delta_capt = 0; | |
b012513c | 482 | unsigned int running, count1, count2; |
98d21df4 | 483 | unsigned long flags; |
597603d6 | 484 | |
98d21df4 | 485 | spin_lock_irqsave(&cable->lock, flags); |
5de9e45f | 486 | running = cable->running ^ cable->pause; |
dd04bb12 | 487 | if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { |
597603d6 JK |
488 | delta_play = jiffies - dpcm_play->last_jiffies; |
489 | dpcm_play->last_jiffies += delta_play; | |
490 | } | |
491 | ||
dd04bb12 | 492 | if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { |
597603d6 JK |
493 | delta_capt = jiffies - dpcm_capt->last_jiffies; |
494 | dpcm_capt->last_jiffies += delta_capt; | |
495 | } | |
496 | ||
98d21df4 TI |
497 | if (delta_play == 0 && delta_capt == 0) |
498 | goto unlock; | |
597603d6 JK |
499 | |
500 | if (delta_play > delta_capt) { | |
b012513c JK |
501 | count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); |
502 | bytepos_finish(dpcm_play, count1); | |
597603d6 JK |
503 | delta_play = delta_capt; |
504 | } else if (delta_play < delta_capt) { | |
b012513c JK |
505 | count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); |
506 | clear_capture_buf(dpcm_capt, count1); | |
507 | bytepos_finish(dpcm_capt, count1); | |
597603d6 JK |
508 | delta_capt = delta_play; |
509 | } | |
510 | ||
98d21df4 TI |
511 | if (delta_play == 0 && delta_capt == 0) |
512 | goto unlock; | |
513 | ||
597603d6 | 514 | /* note delta_capt == delta_play at this moment */ |
b012513c JK |
515 | count1 = bytepos_delta(dpcm_play, delta_play); |
516 | count2 = bytepos_delta(dpcm_capt, delta_capt); | |
517 | if (count1 < count2) { | |
518 | dpcm_capt->last_drift = count2 - count1; | |
519 | count1 = count2; | |
520 | } else if (count1 > count2) { | |
521 | dpcm_play->last_drift = count1 - count2; | |
522 | } | |
523 | copy_play_buf(dpcm_play, dpcm_capt, count1); | |
524 | bytepos_finish(dpcm_play, count1); | |
525 | bytepos_finish(dpcm_capt, count1); | |
98d21df4 TI |
526 | unlock: |
527 | spin_unlock_irqrestore(&cable->lock, flags); | |
dd04bb12 | 528 | return running; |
597603d6 JK |
529 | } |
530 | ||
531 | static void loopback_timer_function(unsigned long data) | |
532 | { | |
533 | struct loopback_pcm *dpcm = (struct loopback_pcm *)data; | |
dd04bb12 | 534 | unsigned int running; |
597603d6 | 535 | |
dd04bb12 JK |
536 | running = loopback_pos_update(dpcm->cable); |
537 | if (running & (1 << dpcm->substream->stream)) { | |
597603d6 | 538 | loopback_timer_start(dpcm); |
dd04bb12 JK |
539 | if (dpcm->period_update_pending) { |
540 | dpcm->period_update_pending = 0; | |
597603d6 | 541 | snd_pcm_period_elapsed(dpcm->substream); |
dd04bb12 | 542 | } |
597603d6 JK |
543 | } |
544 | } | |
545 | ||
546 | static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) | |
547 | { | |
548 | struct snd_pcm_runtime *runtime = substream->runtime; | |
549 | struct loopback_pcm *dpcm = runtime->private_data; | |
550 | ||
551 | loopback_pos_update(dpcm->cable); | |
552 | return bytes_to_frames(runtime, dpcm->buf_pos); | |
553 | } | |
554 | ||
555 | static struct snd_pcm_hardware loopback_pcm_hardware = | |
556 | { | |
557 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | | |
5de9e45f | 558 | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), |
597603d6 JK |
559 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | |
560 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | | |
561 | SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), | |
562 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, | |
563 | .rate_min = 8000, | |
564 | .rate_max = 192000, | |
565 | .channels_min = 1, | |
566 | .channels_max = 32, | |
567 | .buffer_bytes_max = 2 * 1024 * 1024, | |
568 | .period_bytes_min = 64, | |
0db71023 JK |
569 | /* note check overflow in frac_pos() using pcm_rate_shift before |
570 | changing period_bytes_max value */ | |
571 | .period_bytes_max = 1024 * 1024, | |
597603d6 JK |
572 | .periods_min = 1, |
573 | .periods_max = 1024, | |
574 | .fifo_size = 0, | |
575 | }; | |
576 | ||
577 | static void loopback_runtime_free(struct snd_pcm_runtime *runtime) | |
578 | { | |
579 | struct loopback_pcm *dpcm = runtime->private_data; | |
580 | kfree(dpcm); | |
581 | } | |
582 | ||
583 | static int loopback_hw_params(struct snd_pcm_substream *substream, | |
584 | struct snd_pcm_hw_params *params) | |
585 | { | |
6b69a0e5 TI |
586 | return snd_pcm_lib_alloc_vmalloc_buffer(substream, |
587 | params_buffer_bytes(params)); | |
597603d6 JK |
588 | } |
589 | ||
590 | static int loopback_hw_free(struct snd_pcm_substream *substream) | |
591 | { | |
592 | struct snd_pcm_runtime *runtime = substream->runtime; | |
593 | struct loopback_pcm *dpcm = runtime->private_data; | |
594 | struct loopback_cable *cable = dpcm->cable; | |
595 | ||
596 | mutex_lock(&dpcm->loopback->cable_lock); | |
597 | cable->valid &= ~(1 << substream->stream); | |
598 | mutex_unlock(&dpcm->loopback->cable_lock); | |
6b69a0e5 | 599 | return snd_pcm_lib_free_vmalloc_buffer(substream); |
597603d6 JK |
600 | } |
601 | ||
602 | static unsigned int get_cable_index(struct snd_pcm_substream *substream) | |
603 | { | |
604 | if (!substream->pcm->device) | |
605 | return substream->stream; | |
606 | else | |
607 | return !substream->stream; | |
608 | } | |
609 | ||
b1c73fc8 JK |
610 | static int rule_format(struct snd_pcm_hw_params *params, |
611 | struct snd_pcm_hw_rule *rule) | |
612 | { | |
613 | ||
614 | struct snd_pcm_hardware *hw = rule->private; | |
615 | struct snd_mask *maskp = hw_param_mask(params, rule->var); | |
616 | ||
617 | maskp->bits[0] &= (u_int32_t)hw->formats; | |
618 | maskp->bits[1] &= (u_int32_t)(hw->formats >> 32); | |
619 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ | |
620 | if (! maskp->bits[0] && ! maskp->bits[1]) | |
621 | return -EINVAL; | |
622 | return 0; | |
623 | } | |
624 | ||
625 | static int rule_rate(struct snd_pcm_hw_params *params, | |
626 | struct snd_pcm_hw_rule *rule) | |
627 | { | |
628 | struct snd_pcm_hardware *hw = rule->private; | |
629 | struct snd_interval t; | |
630 | ||
631 | t.min = hw->rate_min; | |
632 | t.max = hw->rate_max; | |
633 | t.openmin = t.openmax = 0; | |
634 | t.integer = 0; | |
635 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
636 | } | |
637 | ||
638 | static int rule_channels(struct snd_pcm_hw_params *params, | |
639 | struct snd_pcm_hw_rule *rule) | |
640 | { | |
641 | struct snd_pcm_hardware *hw = rule->private; | |
642 | struct snd_interval t; | |
643 | ||
644 | t.min = hw->channels_min; | |
645 | t.max = hw->channels_max; | |
646 | t.openmin = t.openmax = 0; | |
647 | t.integer = 0; | |
648 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
649 | } | |
650 | ||
597603d6 JK |
651 | static int loopback_open(struct snd_pcm_substream *substream) |
652 | { | |
653 | struct snd_pcm_runtime *runtime = substream->runtime; | |
654 | struct loopback *loopback = substream->private_data; | |
655 | struct loopback_pcm *dpcm; | |
656 | struct loopback_cable *cable; | |
657 | int err = 0; | |
658 | int dev = get_cable_index(substream); | |
659 | ||
660 | mutex_lock(&loopback->cable_lock); | |
661 | dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); | |
662 | if (!dpcm) { | |
663 | err = -ENOMEM; | |
664 | goto unlock; | |
665 | } | |
666 | dpcm->loopback = loopback; | |
667 | dpcm->substream = substream; | |
668 | setup_timer(&dpcm->timer, loopback_timer_function, | |
669 | (unsigned long)dpcm); | |
670 | ||
671 | cable = loopback->cables[substream->number][dev]; | |
672 | if (!cable) { | |
673 | cable = kzalloc(sizeof(*cable), GFP_KERNEL); | |
674 | if (!cable) { | |
675 | kfree(dpcm); | |
676 | err = -ENOMEM; | |
677 | goto unlock; | |
678 | } | |
679 | spin_lock_init(&cable->lock); | |
680 | cable->hw = loopback_pcm_hardware; | |
681 | loopback->cables[substream->number][dev] = cable; | |
682 | } | |
683 | dpcm->cable = cable; | |
684 | cable->streams[substream->stream] = dpcm; | |
685 | ||
686 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
687 | ||
b1c73fc8 JK |
688 | /* use dynamic rules based on actual runtime->hw values */ |
689 | /* note that the default rules created in the PCM midlevel code */ | |
690 | /* are cached -> they do not reflect the actual state */ | |
691 | err = snd_pcm_hw_rule_add(runtime, 0, | |
692 | SNDRV_PCM_HW_PARAM_FORMAT, | |
693 | rule_format, &runtime->hw, | |
694 | SNDRV_PCM_HW_PARAM_FORMAT, -1); | |
695 | if (err < 0) | |
696 | goto unlock; | |
697 | err = snd_pcm_hw_rule_add(runtime, 0, | |
698 | SNDRV_PCM_HW_PARAM_RATE, | |
699 | rule_rate, &runtime->hw, | |
700 | SNDRV_PCM_HW_PARAM_RATE, -1); | |
701 | if (err < 0) | |
702 | goto unlock; | |
703 | err = snd_pcm_hw_rule_add(runtime, 0, | |
704 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
705 | rule_channels, &runtime->hw, | |
706 | SNDRV_PCM_HW_PARAM_CHANNELS, -1); | |
707 | if (err < 0) | |
708 | goto unlock; | |
709 | ||
597603d6 JK |
710 | runtime->private_data = dpcm; |
711 | runtime->private_free = loopback_runtime_free; | |
b1c73fc8 | 712 | if (get_notify(dpcm)) |
597603d6 | 713 | runtime->hw = loopback_pcm_hardware; |
b1c73fc8 | 714 | else |
597603d6 | 715 | runtime->hw = cable->hw; |
597603d6 JK |
716 | unlock: |
717 | mutex_unlock(&loopback->cable_lock); | |
718 | return err; | |
719 | } | |
720 | ||
721 | static int loopback_close(struct snd_pcm_substream *substream) | |
722 | { | |
723 | struct loopback *loopback = substream->private_data; | |
724 | struct loopback_pcm *dpcm = substream->runtime->private_data; | |
725 | struct loopback_cable *cable; | |
726 | int dev = get_cable_index(substream); | |
727 | ||
728 | loopback_timer_stop(dpcm); | |
729 | mutex_lock(&loopback->cable_lock); | |
730 | cable = loopback->cables[substream->number][dev]; | |
731 | if (cable->streams[!substream->stream]) { | |
732 | /* other stream is still alive */ | |
733 | cable->streams[substream->stream] = NULL; | |
734 | } else { | |
735 | /* free the cable */ | |
736 | loopback->cables[substream->number][dev] = NULL; | |
737 | kfree(cable); | |
738 | } | |
739 | mutex_unlock(&loopback->cable_lock); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | static struct snd_pcm_ops loopback_playback_ops = { | |
744 | .open = loopback_open, | |
745 | .close = loopback_close, | |
746 | .ioctl = snd_pcm_lib_ioctl, | |
747 | .hw_params = loopback_hw_params, | |
748 | .hw_free = loopback_hw_free, | |
749 | .prepare = loopback_prepare, | |
750 | .trigger = loopback_trigger, | |
751 | .pointer = loopback_pointer, | |
6b69a0e5 TI |
752 | .page = snd_pcm_lib_get_vmalloc_page, |
753 | .mmap = snd_pcm_lib_mmap_vmalloc, | |
597603d6 JK |
754 | }; |
755 | ||
756 | static struct snd_pcm_ops loopback_capture_ops = { | |
757 | .open = loopback_open, | |
758 | .close = loopback_close, | |
759 | .ioctl = snd_pcm_lib_ioctl, | |
760 | .hw_params = loopback_hw_params, | |
761 | .hw_free = loopback_hw_free, | |
762 | .prepare = loopback_prepare, | |
763 | .trigger = loopback_trigger, | |
764 | .pointer = loopback_pointer, | |
6b69a0e5 TI |
765 | .page = snd_pcm_lib_get_vmalloc_page, |
766 | .mmap = snd_pcm_lib_mmap_vmalloc, | |
597603d6 JK |
767 | }; |
768 | ||
769 | static int __devinit loopback_pcm_new(struct loopback *loopback, | |
770 | int device, int substreams) | |
771 | { | |
772 | struct snd_pcm *pcm; | |
773 | int err; | |
774 | ||
775 | err = snd_pcm_new(loopback->card, "Loopback PCM", device, | |
776 | substreams, substreams, &pcm); | |
777 | if (err < 0) | |
778 | return err; | |
779 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); | |
780 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); | |
781 | ||
782 | pcm->private_data = loopback; | |
783 | pcm->info_flags = 0; | |
784 | strcpy(pcm->name, "Loopback PCM"); | |
785 | ||
786 | loopback->pcm[device] = pcm; | |
597603d6 JK |
787 | return 0; |
788 | } | |
789 | ||
790 | static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, | |
791 | struct snd_ctl_elem_info *uinfo) | |
792 | { | |
793 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
794 | uinfo->count = 1; | |
795 | uinfo->value.integer.min = 80000; | |
796 | uinfo->value.integer.max = 120000; | |
797 | uinfo->value.integer.step = 1; | |
798 | return 0; | |
799 | } | |
800 | ||
801 | static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, | |
802 | struct snd_ctl_elem_value *ucontrol) | |
803 | { | |
804 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
805 | ||
806 | ucontrol->value.integer.value[0] = | |
807 | loopback->setup[kcontrol->id.subdevice] | |
808 | [kcontrol->id.device].rate_shift; | |
809 | return 0; | |
810 | } | |
811 | ||
812 | static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, | |
813 | struct snd_ctl_elem_value *ucontrol) | |
814 | { | |
815 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
816 | unsigned int val; | |
817 | int change = 0; | |
818 | ||
819 | val = ucontrol->value.integer.value[0]; | |
820 | if (val < 80000) | |
821 | val = 80000; | |
822 | if (val > 120000) | |
823 | val = 120000; | |
824 | mutex_lock(&loopback->cable_lock); | |
825 | if (val != loopback->setup[kcontrol->id.subdevice] | |
826 | [kcontrol->id.device].rate_shift) { | |
827 | loopback->setup[kcontrol->id.subdevice] | |
828 | [kcontrol->id.device].rate_shift = val; | |
829 | change = 1; | |
830 | } | |
831 | mutex_unlock(&loopback->cable_lock); | |
832 | return change; | |
833 | } | |
834 | ||
835 | static int loopback_notify_get(struct snd_kcontrol *kcontrol, | |
836 | struct snd_ctl_elem_value *ucontrol) | |
837 | { | |
838 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
839 | ||
840 | ucontrol->value.integer.value[0] = | |
841 | loopback->setup[kcontrol->id.subdevice] | |
842 | [kcontrol->id.device].notify; | |
843 | return 0; | |
844 | } | |
845 | ||
846 | static int loopback_notify_put(struct snd_kcontrol *kcontrol, | |
847 | struct snd_ctl_elem_value *ucontrol) | |
848 | { | |
849 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
850 | unsigned int val; | |
851 | int change = 0; | |
852 | ||
853 | val = ucontrol->value.integer.value[0] ? 1 : 0; | |
854 | if (val != loopback->setup[kcontrol->id.subdevice] | |
855 | [kcontrol->id.device].notify) { | |
856 | loopback->setup[kcontrol->id.subdevice] | |
857 | [kcontrol->id.device].notify = val; | |
858 | change = 1; | |
859 | } | |
860 | return change; | |
861 | } | |
862 | ||
863 | static int loopback_active_get(struct snd_kcontrol *kcontrol, | |
864 | struct snd_ctl_elem_value *ucontrol) | |
865 | { | |
866 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
867 | struct loopback_cable *cable = loopback->cables | |
ac446fb7 | 868 | [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; |
597603d6 JK |
869 | unsigned int val = 0; |
870 | ||
871 | if (cable != NULL) | |
872 | val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? | |
873 | 1 : 0; | |
874 | ucontrol->value.integer.value[0] = val; | |
875 | return 0; | |
876 | } | |
877 | ||
878 | static int loopback_format_info(struct snd_kcontrol *kcontrol, | |
879 | struct snd_ctl_elem_info *uinfo) | |
880 | { | |
881 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
882 | uinfo->count = 1; | |
883 | uinfo->value.integer.min = 0; | |
884 | uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; | |
885 | uinfo->value.integer.step = 1; | |
886 | return 0; | |
887 | } | |
888 | ||
889 | static int loopback_format_get(struct snd_kcontrol *kcontrol, | |
890 | struct snd_ctl_elem_value *ucontrol) | |
891 | { | |
892 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
893 | ||
894 | ucontrol->value.integer.value[0] = | |
895 | loopback->setup[kcontrol->id.subdevice] | |
896 | [kcontrol->id.device].format; | |
897 | return 0; | |
898 | } | |
899 | ||
900 | static int loopback_rate_info(struct snd_kcontrol *kcontrol, | |
901 | struct snd_ctl_elem_info *uinfo) | |
902 | { | |
903 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
904 | uinfo->count = 1; | |
905 | uinfo->value.integer.min = 0; | |
906 | uinfo->value.integer.max = 192000; | |
907 | uinfo->value.integer.step = 1; | |
908 | return 0; | |
909 | } | |
910 | ||
911 | static int loopback_rate_get(struct snd_kcontrol *kcontrol, | |
912 | struct snd_ctl_elem_value *ucontrol) | |
913 | { | |
914 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
915 | ||
916 | ucontrol->value.integer.value[0] = | |
917 | loopback->setup[kcontrol->id.subdevice] | |
918 | [kcontrol->id.device].rate; | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static int loopback_channels_info(struct snd_kcontrol *kcontrol, | |
923 | struct snd_ctl_elem_info *uinfo) | |
924 | { | |
925 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
926 | uinfo->count = 1; | |
927 | uinfo->value.integer.min = 1; | |
928 | uinfo->value.integer.max = 1024; | |
929 | uinfo->value.integer.step = 1; | |
930 | return 0; | |
931 | } | |
932 | ||
933 | static int loopback_channels_get(struct snd_kcontrol *kcontrol, | |
934 | struct snd_ctl_elem_value *ucontrol) | |
935 | { | |
936 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
937 | ||
938 | ucontrol->value.integer.value[0] = | |
939 | loopback->setup[kcontrol->id.subdevice] | |
1446c5fb | 940 | [kcontrol->id.device].channels; |
597603d6 JK |
941 | return 0; |
942 | } | |
943 | ||
944 | static struct snd_kcontrol_new loopback_controls[] __devinitdata = { | |
945 | { | |
946 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
947 | .name = "PCM Rate Shift 100000", | |
948 | .info = loopback_rate_shift_info, | |
949 | .get = loopback_rate_shift_get, | |
950 | .put = loopback_rate_shift_put, | |
951 | }, | |
952 | { | |
953 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
954 | .name = "PCM Notify", | |
955 | .info = snd_ctl_boolean_mono_info, | |
956 | .get = loopback_notify_get, | |
957 | .put = loopback_notify_put, | |
958 | }, | |
959 | #define ACTIVE_IDX 2 | |
960 | { | |
961 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
962 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
963 | .name = "PCM Slave Active", | |
964 | .info = snd_ctl_boolean_mono_info, | |
965 | .get = loopback_active_get, | |
966 | }, | |
967 | #define FORMAT_IDX 3 | |
968 | { | |
969 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
970 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
971 | .name = "PCM Slave Format", | |
972 | .info = loopback_format_info, | |
973 | .get = loopback_format_get | |
974 | }, | |
975 | #define RATE_IDX 4 | |
976 | { | |
977 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
978 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
979 | .name = "PCM Slave Rate", | |
980 | .info = loopback_rate_info, | |
981 | .get = loopback_rate_get | |
982 | }, | |
983 | #define CHANNELS_IDX 5 | |
984 | { | |
985 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
986 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
987 | .name = "PCM Slave Channels", | |
988 | .info = loopback_channels_info, | |
989 | .get = loopback_channels_get | |
990 | } | |
991 | }; | |
992 | ||
993 | static int __devinit loopback_mixer_new(struct loopback *loopback, int notify) | |
994 | { | |
995 | struct snd_card *card = loopback->card; | |
996 | struct snd_pcm *pcm; | |
997 | struct snd_kcontrol *kctl; | |
998 | struct loopback_setup *setup; | |
999 | int err, dev, substr, substr_count, idx; | |
1000 | ||
1001 | strcpy(card->mixername, "Loopback Mixer"); | |
1002 | for (dev = 0; dev < 2; dev++) { | |
1003 | pcm = loopback->pcm[dev]; | |
1004 | substr_count = | |
1005 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; | |
1006 | for (substr = 0; substr < substr_count; substr++) { | |
1007 | setup = &loopback->setup[substr][dev]; | |
1008 | setup->notify = notify; | |
1009 | setup->rate_shift = NO_PITCH; | |
1010 | setup->format = SNDRV_PCM_FORMAT_S16_LE; | |
1011 | setup->rate = 48000; | |
1012 | setup->channels = 2; | |
1013 | for (idx = 0; idx < ARRAY_SIZE(loopback_controls); | |
1014 | idx++) { | |
1015 | kctl = snd_ctl_new1(&loopback_controls[idx], | |
1016 | loopback); | |
1017 | if (!kctl) | |
1018 | return -ENOMEM; | |
1019 | kctl->id.device = dev; | |
1020 | kctl->id.subdevice = substr; | |
1021 | switch (idx) { | |
1022 | case ACTIVE_IDX: | |
1023 | setup->active_id = kctl->id; | |
1024 | break; | |
1025 | case FORMAT_IDX: | |
1026 | setup->format_id = kctl->id; | |
1027 | break; | |
1028 | case RATE_IDX: | |
1029 | setup->rate_id = kctl->id; | |
1030 | break; | |
1031 | case CHANNELS_IDX: | |
1032 | setup->channels_id = kctl->id; | |
1033 | break; | |
1034 | default: | |
1035 | break; | |
1036 | } | |
1037 | err = snd_ctl_add(card, kctl); | |
1038 | if (err < 0) | |
1039 | return err; | |
1040 | } | |
1041 | } | |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
e74670b6 JK |
1046 | #ifdef CONFIG_PROC_FS |
1047 | ||
1048 | static void print_dpcm_info(struct snd_info_buffer *buffer, | |
1049 | struct loopback_pcm *dpcm, | |
1050 | const char *id) | |
1051 | { | |
1052 | snd_iprintf(buffer, " %s\n", id); | |
1053 | if (dpcm == NULL) { | |
1054 | snd_iprintf(buffer, " inactive\n"); | |
1055 | return; | |
1056 | } | |
1057 | snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); | |
1058 | snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); | |
1059 | snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); | |
1060 | snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); | |
1061 | snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); | |
1062 | snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); | |
1063 | snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); | |
1064 | snd_iprintf(buffer, " update_pending:\t%u\n", | |
1065 | dpcm->period_update_pending); | |
1066 | snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); | |
1067 | snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); | |
1068 | snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", | |
1069 | dpcm->last_jiffies, jiffies); | |
1070 | snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); | |
1071 | } | |
1072 | ||
1073 | static void print_substream_info(struct snd_info_buffer *buffer, | |
1074 | struct loopback *loopback, | |
1075 | int sub, | |
1076 | int num) | |
1077 | { | |
1078 | struct loopback_cable *cable = loopback->cables[sub][num]; | |
1079 | ||
1080 | snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); | |
1081 | if (cable == NULL) { | |
1082 | snd_iprintf(buffer, " inactive\n"); | |
1083 | return; | |
1084 | } | |
1085 | snd_iprintf(buffer, " valid: %u\n", cable->valid); | |
1086 | snd_iprintf(buffer, " running: %u\n", cable->running); | |
5de9e45f | 1087 | snd_iprintf(buffer, " pause: %u\n", cable->pause); |
e74670b6 JK |
1088 | print_dpcm_info(buffer, cable->streams[0], "Playback"); |
1089 | print_dpcm_info(buffer, cable->streams[1], "Capture"); | |
1090 | } | |
1091 | ||
1092 | static void print_cable_info(struct snd_info_entry *entry, | |
1093 | struct snd_info_buffer *buffer) | |
1094 | { | |
1095 | struct loopback *loopback = entry->private_data; | |
1096 | int sub, num; | |
1097 | ||
1098 | mutex_lock(&loopback->cable_lock); | |
1099 | num = entry->name[strlen(entry->name)-1]; | |
1100 | num = num == '0' ? 0 : 1; | |
1101 | for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) | |
1102 | print_substream_info(buffer, loopback, sub, num); | |
1103 | mutex_unlock(&loopback->cable_lock); | |
1104 | } | |
1105 | ||
1106 | static int __devinit loopback_proc_new(struct loopback *loopback, int cidx) | |
1107 | { | |
1108 | char name[32]; | |
1109 | struct snd_info_entry *entry; | |
1110 | int err; | |
1111 | ||
1112 | snprintf(name, sizeof(name), "cable#%d", cidx); | |
1113 | err = snd_card_proc_new(loopback->card, name, &entry); | |
1114 | if (err < 0) | |
1115 | return err; | |
1116 | ||
1117 | snd_info_set_text_ops(entry, loopback, print_cable_info); | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | #else /* !CONFIG_PROC_FS */ | |
1122 | ||
1123 | #define loopback_proc_new(loopback, cidx) do { } while (0) | |
1124 | ||
1125 | #endif | |
1126 | ||
597603d6 JK |
1127 | static int __devinit loopback_probe(struct platform_device *devptr) |
1128 | { | |
1129 | struct snd_card *card; | |
1130 | struct loopback *loopback; | |
1131 | int dev = devptr->id; | |
1132 | int err; | |
1133 | ||
1134 | err = snd_card_create(index[dev], id[dev], THIS_MODULE, | |
1135 | sizeof(struct loopback), &card); | |
1136 | if (err < 0) | |
1137 | return err; | |
1138 | loopback = card->private_data; | |
1139 | ||
1140 | if (pcm_substreams[dev] < 1) | |
1141 | pcm_substreams[dev] = 1; | |
1142 | if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) | |
1143 | pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; | |
1144 | ||
1145 | loopback->card = card; | |
1146 | mutex_init(&loopback->cable_lock); | |
1147 | ||
1148 | err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); | |
1149 | if (err < 0) | |
1150 | goto __nodev; | |
1151 | err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); | |
1152 | if (err < 0) | |
1153 | goto __nodev; | |
1154 | err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); | |
1155 | if (err < 0) | |
1156 | goto __nodev; | |
e74670b6 JK |
1157 | loopback_proc_new(loopback, 0); |
1158 | loopback_proc_new(loopback, 1); | |
597603d6 JK |
1159 | strcpy(card->driver, "Loopback"); |
1160 | strcpy(card->shortname, "Loopback"); | |
1161 | sprintf(card->longname, "Loopback %i", dev + 1); | |
1162 | err = snd_card_register(card); | |
1163 | if (!err) { | |
1164 | platform_set_drvdata(devptr, card); | |
1165 | return 0; | |
1166 | } | |
1167 | __nodev: | |
1168 | snd_card_free(card); | |
1169 | return err; | |
1170 | } | |
1171 | ||
1172 | static int __devexit loopback_remove(struct platform_device *devptr) | |
1173 | { | |
1174 | snd_card_free(platform_get_drvdata(devptr)); | |
1175 | platform_set_drvdata(devptr, NULL); | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | #ifdef CONFIG_PM | |
1180 | static int loopback_suspend(struct platform_device *pdev, | |
1181 | pm_message_t state) | |
1182 | { | |
1183 | struct snd_card *card = platform_get_drvdata(pdev); | |
1184 | struct loopback *loopback = card->private_data; | |
1185 | ||
1186 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
1187 | ||
1188 | snd_pcm_suspend_all(loopback->pcm[0]); | |
1189 | snd_pcm_suspend_all(loopback->pcm[1]); | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | static int loopback_resume(struct platform_device *pdev) | |
1194 | { | |
1195 | struct snd_card *card = platform_get_drvdata(pdev); | |
1196 | ||
1197 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
1198 | return 0; | |
1199 | } | |
1200 | #endif | |
1201 | ||
1202 | #define SND_LOOPBACK_DRIVER "snd_aloop" | |
1203 | ||
1204 | static struct platform_driver loopback_driver = { | |
1205 | .probe = loopback_probe, | |
1206 | .remove = __devexit_p(loopback_remove), | |
1207 | #ifdef CONFIG_PM | |
1208 | .suspend = loopback_suspend, | |
1209 | .resume = loopback_resume, | |
1210 | #endif | |
1211 | .driver = { | |
1212 | .name = SND_LOOPBACK_DRIVER | |
1213 | }, | |
1214 | }; | |
1215 | ||
1216 | static void loopback_unregister_all(void) | |
1217 | { | |
1218 | int i; | |
1219 | ||
1220 | for (i = 0; i < ARRAY_SIZE(devices); ++i) | |
1221 | platform_device_unregister(devices[i]); | |
1222 | platform_driver_unregister(&loopback_driver); | |
1223 | } | |
1224 | ||
1225 | static int __init alsa_card_loopback_init(void) | |
1226 | { | |
1227 | int i, err, cards; | |
1228 | ||
1229 | err = platform_driver_register(&loopback_driver); | |
1230 | if (err < 0) | |
1231 | return err; | |
1232 | ||
1233 | ||
1234 | cards = 0; | |
1235 | for (i = 0; i < SNDRV_CARDS; i++) { | |
1236 | struct platform_device *device; | |
1237 | if (!enable[i]) | |
1238 | continue; | |
1239 | device = platform_device_register_simple(SND_LOOPBACK_DRIVER, | |
1240 | i, NULL, 0); | |
1241 | if (IS_ERR(device)) | |
1242 | continue; | |
1243 | if (!platform_get_drvdata(device)) { | |
1244 | platform_device_unregister(device); | |
1245 | continue; | |
1246 | } | |
1247 | devices[i] = device; | |
1248 | cards++; | |
1249 | } | |
1250 | if (!cards) { | |
1251 | #ifdef MODULE | |
1252 | printk(KERN_ERR "aloop: No loopback enabled\n"); | |
1253 | #endif | |
1254 | loopback_unregister_all(); | |
1255 | return -ENODEV; | |
1256 | } | |
1257 | return 0; | |
1258 | } | |
1259 | ||
1260 | static void __exit alsa_card_loopback_exit(void) | |
1261 | { | |
1262 | loopback_unregister_all(); | |
1263 | } | |
1264 | ||
1265 | module_init(alsa_card_loopback_init) | |
1266 | module_exit(alsa_card_loopback_exit) |