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1 | /* |
2 | * This program is free software; you can redistribute it and/or modify |
3 | * it under the terms of the GNU General Public License as published by |
4 | * the Free Software Foundation; either version 2 of the License, or |
5 | * (at your option) any later version. |
6 | * |
7 | * This program is distributed in the hope that it will be useful, |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
10 | * GNU General Public License for more details. |
11 | * |
12 | * You should have received a copy of the GNU General Public License |
13 | * along with this program; if not, write to the Free Software |
14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
15 | */ |
16 | |
17 | #include <linux/init.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/ratelimit.h> |
20 | #include <linux/usb.h> |
21 | #include <linux/usb/audio.h> |
22 | #include <linux/usb/audio-v2.h> |
23 | |
24 | #include <sound/core.h> |
25 | #include <sound/pcm.h> |
26 | #include <sound/pcm_params.h> |
27 | |
28 | #include "usbaudio.h" |
29 | #include "card.h" |
30 | #include "quirks.h" |
31 | #include "debug.h" |
32 | #include "endpoint.h" |
33 | #include "helper.h" |
34 | #include "pcm.h" |
35 | #include "clock.h" |
36 | #include "power.h" |
37 | |
38 | #define SUBSTREAM_FLAG_DATA_EP_STARTED 0 |
39 | #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1 |
40 | |
41 | /* return the estimated delay based on USB frame counters */ |
42 | snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs, |
43 | unsigned int rate) |
44 | { |
45 | int current_frame_number; |
46 | int frame_diff; |
47 | int est_delay; |
48 | |
49 | current_frame_number = usb_get_current_frame_number(subs->dev); |
50 | /* |
51 | * HCD implementations use different widths, use lower 8 bits. |
52 | * The delay will be managed up to 256ms, which is more than |
53 | * enough |
54 | */ |
55 | frame_diff = (current_frame_number - subs->last_frame_number) & 0xff; |
56 | |
57 | /* Approximation based on number of samples per USB frame (ms), |
58 | some truncation for 44.1 but the estimate is good enough */ |
59 | est_delay = subs->last_delay - (frame_diff * rate / 1000); |
60 | if (est_delay < 0) |
61 | est_delay = 0; |
62 | return est_delay; |
63 | } |
64 | |
65 | /* |
66 | * return the current pcm pointer. just based on the hwptr_done value. |
67 | */ |
68 | static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream) |
69 | { |
70 | struct snd_usb_substream *subs; |
71 | unsigned int hwptr_done; |
72 | |
73 | subs = (struct snd_usb_substream *)substream->runtime->private_data; |
74 | spin_lock(&subs->lock); |
75 | hwptr_done = subs->hwptr_done; |
76 | substream->runtime->delay = snd_usb_pcm_delay(subs, |
77 | substream->runtime->rate); |
78 | spin_unlock(&subs->lock); |
79 | return hwptr_done / (substream->runtime->frame_bits >> 3); |
80 | } |
81 | |
82 | /* |
83 | * find a matching audio format |
84 | */ |
85 | static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format, |
86 | unsigned int rate, unsigned int channels) |
87 | { |
88 | struct list_head *p; |
89 | struct audioformat *found = NULL; |
90 | int cur_attr = 0, attr; |
91 | |
92 | list_for_each(p, &subs->fmt_list) { |
93 | struct audioformat *fp; |
94 | fp = list_entry(p, struct audioformat, list); |
95 | if (!(fp->formats & (1uLL << format))) |
96 | continue; |
97 | if (fp->channels != channels) |
98 | continue; |
99 | if (rate < fp->rate_min || rate > fp->rate_max) |
100 | continue; |
101 | if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { |
102 | unsigned int i; |
103 | for (i = 0; i < fp->nr_rates; i++) |
104 | if (fp->rate_table[i] == rate) |
105 | break; |
106 | if (i >= fp->nr_rates) |
107 | continue; |
108 | } |
109 | attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE; |
110 | if (! found) { |
111 | found = fp; |
112 | cur_attr = attr; |
113 | continue; |
114 | } |
115 | /* avoid async out and adaptive in if the other method |
116 | * supports the same format. |
117 | * this is a workaround for the case like |
118 | * M-audio audiophile USB. |
119 | */ |
120 | if (attr != cur_attr) { |
121 | if ((attr == USB_ENDPOINT_SYNC_ASYNC && |
122 | subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || |
123 | (attr == USB_ENDPOINT_SYNC_ADAPTIVE && |
124 | subs->direction == SNDRV_PCM_STREAM_CAPTURE)) |
125 | continue; |
126 | if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC && |
127 | subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || |
128 | (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE && |
129 | subs->direction == SNDRV_PCM_STREAM_CAPTURE)) { |
130 | found = fp; |
131 | cur_attr = attr; |
132 | continue; |
133 | } |
134 | } |
135 | /* find the format with the largest max. packet size */ |
136 | if (fp->maxpacksize > found->maxpacksize) { |
137 | found = fp; |
138 | cur_attr = attr; |
139 | } |
140 | } |
141 | return found; |
142 | } |
143 | |
144 | static int init_pitch_v1(struct snd_usb_audio *chip, int iface, |
145 | struct usb_host_interface *alts, |
146 | struct audioformat *fmt) |
147 | { |
148 | struct usb_device *dev = chip->dev; |
149 | unsigned int ep; |
150 | unsigned char data[1]; |
151 | int err; |
152 | |
153 | ep = get_endpoint(alts, 0)->bEndpointAddress; |
154 | |
155 | data[0] = 1; |
156 | if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, |
157 | USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, |
158 | UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, |
159 | data, sizeof(data))) < 0) { |
160 | snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n", |
161 | dev->devnum, iface, ep); |
162 | return err; |
163 | } |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | static int init_pitch_v2(struct snd_usb_audio *chip, int iface, |
169 | struct usb_host_interface *alts, |
170 | struct audioformat *fmt) |
171 | { |
172 | struct usb_device *dev = chip->dev; |
173 | unsigned char data[1]; |
174 | unsigned int ep; |
175 | int err; |
176 | |
177 | ep = get_endpoint(alts, 0)->bEndpointAddress; |
178 | |
179 | data[0] = 1; |
180 | if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, |
181 | USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, |
182 | UAC2_EP_CS_PITCH << 8, 0, |
183 | data, sizeof(data))) < 0) { |
184 | snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n", |
185 | dev->devnum, iface, fmt->altsetting); |
186 | return err; |
187 | } |
188 | |
189 | return 0; |
190 | } |
191 | |
192 | /* |
193 | * initialize the pitch control and sample rate |
194 | */ |
195 | int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface, |
196 | struct usb_host_interface *alts, |
197 | struct audioformat *fmt) |
198 | { |
199 | struct usb_interface_descriptor *altsd = get_iface_desc(alts); |
200 | |
201 | /* if endpoint doesn't have pitch control, bail out */ |
202 | if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) |
203 | return 0; |
204 | |
205 | switch (altsd->bInterfaceProtocol) { |
206 | case UAC_VERSION_1: |
207 | default: |
208 | return init_pitch_v1(chip, iface, alts, fmt); |
209 | |
210 | case UAC_VERSION_2: |
211 | return init_pitch_v2(chip, iface, alts, fmt); |
212 | } |
213 | } |
214 | |
215 | static int start_endpoints(struct snd_usb_substream *subs, int can_sleep) |
216 | { |
217 | int err; |
218 | |
219 | if (!subs->data_endpoint) |
220 | return -EINVAL; |
221 | |
222 | if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { |
223 | struct snd_usb_endpoint *ep = subs->data_endpoint; |
224 | |
225 | snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep); |
226 | |
227 | ep->data_subs = subs; |
228 | err = snd_usb_endpoint_start(ep, can_sleep); |
229 | if (err < 0) { |
230 | clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); |
231 | return err; |
232 | } |
233 | } |
234 | |
235 | if (subs->sync_endpoint && |
236 | !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { |
237 | struct snd_usb_endpoint *ep = subs->sync_endpoint; |
238 | |
239 | if (subs->data_endpoint->iface != subs->sync_endpoint->iface || |
240 | subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) { |
241 | err = usb_set_interface(subs->dev, |
242 | subs->sync_endpoint->iface, |
243 | subs->sync_endpoint->alt_idx); |
244 | if (err < 0) { |
245 | snd_printk(KERN_ERR |
246 | "%d:%d:%d: cannot set interface (%d)\n", |
247 | subs->dev->devnum, |
248 | subs->sync_endpoint->iface, |
249 | subs->sync_endpoint->alt_idx, err); |
250 | return -EIO; |
251 | } |
252 | } |
253 | |
254 | snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep); |
255 | |
256 | ep->sync_slave = subs->data_endpoint; |
257 | err = snd_usb_endpoint_start(ep, can_sleep); |
258 | if (err < 0) { |
259 | clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); |
260 | return err; |
261 | } |
262 | } |
263 | |
264 | return 0; |
265 | } |
266 | |
267 | static void stop_endpoints(struct snd_usb_substream *subs, |
268 | int force, int can_sleep, int wait) |
269 | { |
270 | if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) |
271 | snd_usb_endpoint_stop(subs->sync_endpoint, |
272 | force, can_sleep, wait); |
273 | |
274 | if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) |
275 | snd_usb_endpoint_stop(subs->data_endpoint, |
276 | force, can_sleep, wait); |
277 | } |
278 | |
279 | static int deactivate_endpoints(struct snd_usb_substream *subs) |
280 | { |
281 | int reta, retb; |
282 | |
283 | reta = snd_usb_endpoint_deactivate(subs->sync_endpoint); |
284 | retb = snd_usb_endpoint_deactivate(subs->data_endpoint); |
285 | |
286 | if (reta < 0) |
287 | return reta; |
288 | |
289 | if (retb < 0) |
290 | return retb; |
291 | |
292 | return 0; |
293 | } |
294 | |
295 | /* |
296 | * find a matching format and set up the interface |
297 | */ |
298 | static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) |
299 | { |
300 | struct usb_device *dev = subs->dev; |
301 | struct usb_host_interface *alts; |
302 | struct usb_interface_descriptor *altsd; |
303 | struct usb_interface *iface; |
304 | unsigned int ep, attr; |
305 | int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; |
306 | int err, implicit_fb = 0; |
307 | |
308 | iface = usb_ifnum_to_if(dev, fmt->iface); |
309 | if (WARN_ON(!iface)) |
310 | return -EINVAL; |
311 | alts = &iface->altsetting[fmt->altset_idx]; |
312 | altsd = get_iface_desc(alts); |
313 | if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) |
314 | return -EINVAL; |
315 | |
316 | if (fmt == subs->cur_audiofmt) |
317 | return 0; |
318 | |
319 | /* close the old interface */ |
320 | if (subs->interface >= 0 && subs->interface != fmt->iface) { |
321 | err = usb_set_interface(subs->dev, subs->interface, 0); |
322 | if (err < 0) { |
323 | snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n", |
324 | dev->devnum, fmt->iface, fmt->altsetting, err); |
325 | return -EIO; |
326 | } |
327 | subs->interface = -1; |
328 | subs->altset_idx = 0; |
329 | } |
330 | |
331 | /* set interface */ |
332 | if (subs->interface != fmt->iface || |
333 | subs->altset_idx != fmt->altset_idx) { |
334 | err = usb_set_interface(dev, fmt->iface, fmt->altsetting); |
335 | if (err < 0) { |
336 | snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n", |
337 | dev->devnum, fmt->iface, fmt->altsetting, err); |
338 | return -EIO; |
339 | } |
340 | snd_printdd(KERN_INFO "setting usb interface %d:%d\n", |
341 | fmt->iface, fmt->altsetting); |
342 | subs->interface = fmt->iface; |
343 | subs->altset_idx = fmt->altset_idx; |
344 | } |
345 | |
346 | subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, |
347 | alts, fmt->endpoint, subs->direction, |
348 | SND_USB_ENDPOINT_TYPE_DATA); |
349 | if (!subs->data_endpoint) |
350 | return -EINVAL; |
351 | |
352 | /* we need a sync pipe in async OUT or adaptive IN mode */ |
353 | /* check the number of EP, since some devices have broken |
354 | * descriptors which fool us. if it has only one EP, |
355 | * assume it as adaptive-out or sync-in. |
356 | */ |
357 | attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; |
358 | |
359 | switch (subs->stream->chip->usb_id) { |
360 | case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ |
361 | case USB_ID(0x0763, 0x2081): |
362 | if (is_playback) { |
363 | implicit_fb = 1; |
364 | ep = 0x81; |
365 | iface = usb_ifnum_to_if(dev, 2); |
366 | |
367 | if (!iface || iface->num_altsetting == 0) |
368 | return -EINVAL; |
369 | |
370 | alts = &iface->altsetting[1]; |
371 | goto add_sync_ep; |
372 | } |
373 | } |
374 | |
375 | if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) || |
376 | (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) && |
377 | altsd->bNumEndpoints >= 2) { |
378 | /* check sync-pipe endpoint */ |
379 | /* ... and check descriptor size before accessing bSynchAddress |
380 | because there is a version of the SB Audigy 2 NX firmware lacking |
381 | the audio fields in the endpoint descriptors */ |
382 | if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 || |
383 | (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && |
384 | get_endpoint(alts, 1)->bSynchAddress != 0 && |
385 | !implicit_fb)) { |
386 | snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", |
387 | dev->devnum, fmt->iface, fmt->altsetting, |
388 | get_endpoint(alts, 1)->bmAttributes, |
389 | get_endpoint(alts, 1)->bLength, |
390 | get_endpoint(alts, 1)->bSynchAddress); |
391 | return -EINVAL; |
392 | } |
393 | ep = get_endpoint(alts, 1)->bEndpointAddress; |
394 | if (!implicit_fb && |
395 | get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && |
396 | (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || |
397 | (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { |
398 | snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", |
399 | dev->devnum, fmt->iface, fmt->altsetting, |
400 | is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); |
401 | return -EINVAL; |
402 | } |
403 | |
404 | implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) |
405 | == USB_ENDPOINT_USAGE_IMPLICIT_FB; |
406 | |
407 | add_sync_ep: |
408 | subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, |
409 | alts, ep, !subs->direction, |
410 | implicit_fb ? |
411 | SND_USB_ENDPOINT_TYPE_DATA : |
412 | SND_USB_ENDPOINT_TYPE_SYNC); |
413 | if (!subs->sync_endpoint) |
414 | return -EINVAL; |
415 | |
416 | subs->data_endpoint->sync_master = subs->sync_endpoint; |
417 | } |
418 | |
419 | if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0) |
420 | return err; |
421 | |
422 | subs->cur_audiofmt = fmt; |
423 | |
424 | snd_usb_set_format_quirk(subs, fmt); |
425 | |
426 | #if 0 |
427 | printk(KERN_DEBUG |
428 | "setting done: format = %d, rate = %d..%d, channels = %d\n", |
429 | fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels); |
430 | printk(KERN_DEBUG |
431 | " datapipe = 0x%0x, syncpipe = 0x%0x\n", |
432 | subs->datapipe, subs->syncpipe); |
433 | #endif |
434 | |
435 | return 0; |
436 | } |
437 | |
438 | /* |
439 | * hw_params callback |
440 | * |
441 | * allocate a buffer and set the given audio format. |
442 | * |
443 | * so far we use a physically linear buffer although packetize transfer |
444 | * doesn't need a continuous area. |
445 | * if sg buffer is supported on the later version of alsa, we'll follow |
446 | * that. |
447 | */ |
448 | static int snd_usb_hw_params(struct snd_pcm_substream *substream, |
449 | struct snd_pcm_hw_params *hw_params) |
450 | { |
451 | struct snd_usb_substream *subs = substream->runtime->private_data; |
452 | struct audioformat *fmt; |
453 | unsigned int channels, rate, format; |
454 | int ret, changed; |
455 | |
456 | ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, |
457 | params_buffer_bytes(hw_params)); |
458 | if (ret < 0) |
459 | return ret; |
460 | |
461 | format = params_format(hw_params); |
462 | rate = params_rate(hw_params); |
463 | channels = params_channels(hw_params); |
464 | fmt = find_format(subs, format, rate, channels); |
465 | if (!fmt) { |
466 | snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n", |
467 | format, rate, channels); |
468 | return -EINVAL; |
469 | } |
470 | |
471 | changed = subs->cur_audiofmt != fmt || |
472 | subs->period_bytes != params_period_bytes(hw_params) || |
473 | subs->cur_rate != rate; |
474 | if ((ret = set_format(subs, fmt)) < 0) |
475 | return ret; |
476 | |
477 | if (subs->cur_rate != rate) { |
478 | struct usb_host_interface *alts; |
479 | struct usb_interface *iface; |
480 | iface = usb_ifnum_to_if(subs->dev, fmt->iface); |
481 | alts = &iface->altsetting[fmt->altset_idx]; |
482 | ret = snd_usb_init_sample_rate(subs->stream->chip, fmt->iface, alts, fmt, rate); |
483 | if (ret < 0) |
484 | return ret; |
485 | subs->cur_rate = rate; |
486 | } |
487 | |
488 | if (changed) { |
489 | mutex_lock(&subs->stream->chip->shutdown_mutex); |
490 | /* format changed */ |
491 | stop_endpoints(subs, 0, 0, 0); |
492 | ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt, |
493 | subs->sync_endpoint); |
494 | if (ret < 0) |
495 | goto unlock; |
496 | |
497 | if (subs->sync_endpoint) |
498 | ret = snd_usb_endpoint_set_params(subs->sync_endpoint, |
499 | hw_params, fmt, NULL); |
500 | unlock: |
501 | mutex_unlock(&subs->stream->chip->shutdown_mutex); |
502 | } |
503 | |
504 | if (ret == 0) { |
505 | subs->interface = fmt->iface; |
506 | subs->altset_idx = fmt->altset_idx; |
507 | } |
508 | |
509 | return ret; |
510 | } |
511 | |
512 | /* |
513 | * hw_free callback |
514 | * |
515 | * reset the audio format and release the buffer |
516 | */ |
517 | static int snd_usb_hw_free(struct snd_pcm_substream *substream) |
518 | { |
519 | struct snd_usb_substream *subs = substream->runtime->private_data; |
520 | |
521 | subs->cur_audiofmt = NULL; |
522 | subs->cur_rate = 0; |
523 | subs->period_bytes = 0; |
524 | mutex_lock(&subs->stream->chip->shutdown_mutex); |
525 | stop_endpoints(subs, 0, 1, 1); |
526 | deactivate_endpoints(subs); |
527 | mutex_unlock(&subs->stream->chip->shutdown_mutex); |
528 | return snd_pcm_lib_free_vmalloc_buffer(substream); |
529 | } |
530 | |
531 | /* |
532 | * prepare callback |
533 | * |
534 | * only a few subtle things... |
535 | */ |
536 | static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) |
537 | { |
538 | struct snd_pcm_runtime *runtime = substream->runtime; |
539 | struct snd_usb_substream *subs = runtime->private_data; |
540 | |
541 | if (! subs->cur_audiofmt) { |
542 | snd_printk(KERN_ERR "usbaudio: no format is specified!\n"); |
543 | return -ENXIO; |
544 | } |
545 | |
546 | if (snd_BUG_ON(!subs->data_endpoint)) |
547 | return -EIO; |
548 | |
549 | /* some unit conversions in runtime */ |
550 | subs->data_endpoint->maxframesize = |
551 | bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); |
552 | subs->data_endpoint->curframesize = |
553 | bytes_to_frames(runtime, subs->data_endpoint->curpacksize); |
554 | |
555 | /* reset the pointer */ |
556 | subs->hwptr_done = 0; |
557 | subs->transfer_done = 0; |
558 | subs->last_delay = 0; |
559 | subs->last_frame_number = 0; |
560 | runtime->delay = 0; |
561 | |
562 | /* for playback, submit the URBs now; otherwise, the first hwptr_done |
563 | * updates for all URBs would happen at the same time when starting */ |
564 | if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) |
565 | return start_endpoints(subs, 1); |
566 | |
567 | return 0; |
568 | } |
569 | |
570 | static struct snd_pcm_hardware snd_usb_hardware = |
571 | { |
572 | .info = SNDRV_PCM_INFO_MMAP | |
573 | SNDRV_PCM_INFO_MMAP_VALID | |
574 | SNDRV_PCM_INFO_BATCH | |
575 | SNDRV_PCM_INFO_INTERLEAVED | |
576 | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
577 | SNDRV_PCM_INFO_PAUSE, |
578 | .buffer_bytes_max = 1024 * 1024, |
579 | .period_bytes_min = 64, |
580 | .period_bytes_max = 512 * 1024, |
581 | .periods_min = 2, |
582 | .periods_max = 1024, |
583 | }; |
584 | |
585 | static int hw_check_valid_format(struct snd_usb_substream *subs, |
586 | struct snd_pcm_hw_params *params, |
587 | struct audioformat *fp) |
588 | { |
589 | struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); |
590 | struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
591 | struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); |
592 | struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); |
593 | struct snd_mask check_fmts; |
594 | unsigned int ptime; |
595 | |
596 | /* check the format */ |
597 | snd_mask_none(&check_fmts); |
598 | check_fmts.bits[0] = (u32)fp->formats; |
599 | check_fmts.bits[1] = (u32)(fp->formats >> 32); |
600 | snd_mask_intersect(&check_fmts, fmts); |
601 | if (snd_mask_empty(&check_fmts)) { |
602 | hwc_debug(" > check: no supported format %d\n", fp->format); |
603 | return 0; |
604 | } |
605 | /* check the channels */ |
606 | if (fp->channels < ct->min || fp->channels > ct->max) { |
607 | hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); |
608 | return 0; |
609 | } |
610 | /* check the rate is within the range */ |
611 | if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { |
612 | hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); |
613 | return 0; |
614 | } |
615 | if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { |
616 | hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); |
617 | return 0; |
618 | } |
619 | /* check whether the period time is >= the data packet interval */ |
620 | if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) { |
621 | ptime = 125 * (1 << fp->datainterval); |
622 | if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { |
623 | hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); |
624 | return 0; |
625 | } |
626 | } |
627 | return 1; |
628 | } |
629 | |
630 | static int hw_rule_rate(struct snd_pcm_hw_params *params, |
631 | struct snd_pcm_hw_rule *rule) |
632 | { |
633 | struct snd_usb_substream *subs = rule->private; |
634 | struct list_head *p; |
635 | struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); |
636 | unsigned int rmin, rmax; |
637 | int changed; |
638 | |
639 | hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); |
640 | changed = 0; |
641 | rmin = rmax = 0; |
642 | list_for_each(p, &subs->fmt_list) { |
643 | struct audioformat *fp; |
644 | fp = list_entry(p, struct audioformat, list); |
645 | if (!hw_check_valid_format(subs, params, fp)) |
646 | continue; |
647 | if (changed++) { |
648 | if (rmin > fp->rate_min) |
649 | rmin = fp->rate_min; |
650 | if (rmax < fp->rate_max) |
651 | rmax = fp->rate_max; |
652 | } else { |
653 | rmin = fp->rate_min; |
654 | rmax = fp->rate_max; |
655 | } |
656 | } |
657 | |
658 | if (!changed) { |
659 | hwc_debug(" --> get empty\n"); |
660 | it->empty = 1; |
661 | return -EINVAL; |
662 | } |
663 | |
664 | changed = 0; |
665 | if (it->min < rmin) { |
666 | it->min = rmin; |
667 | it->openmin = 0; |
668 | changed = 1; |
669 | } |
670 | if (it->max > rmax) { |
671 | it->max = rmax; |
672 | it->openmax = 0; |
673 | changed = 1; |
674 | } |
675 | if (snd_interval_checkempty(it)) { |
676 | it->empty = 1; |
677 | return -EINVAL; |
678 | } |
679 | hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); |
680 | return changed; |
681 | } |
682 | |
683 | |
684 | static int hw_rule_channels(struct snd_pcm_hw_params *params, |
685 | struct snd_pcm_hw_rule *rule) |
686 | { |
687 | struct snd_usb_substream *subs = rule->private; |
688 | struct list_head *p; |
689 | struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
690 | unsigned int rmin, rmax; |
691 | int changed; |
692 | |
693 | hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); |
694 | changed = 0; |
695 | rmin = rmax = 0; |
696 | list_for_each(p, &subs->fmt_list) { |
697 | struct audioformat *fp; |
698 | fp = list_entry(p, struct audioformat, list); |
699 | if (!hw_check_valid_format(subs, params, fp)) |
700 | continue; |
701 | if (changed++) { |
702 | if (rmin > fp->channels) |
703 | rmin = fp->channels; |
704 | if (rmax < fp->channels) |
705 | rmax = fp->channels; |
706 | } else { |
707 | rmin = fp->channels; |
708 | rmax = fp->channels; |
709 | } |
710 | } |
711 | |
712 | if (!changed) { |
713 | hwc_debug(" --> get empty\n"); |
714 | it->empty = 1; |
715 | return -EINVAL; |
716 | } |
717 | |
718 | changed = 0; |
719 | if (it->min < rmin) { |
720 | it->min = rmin; |
721 | it->openmin = 0; |
722 | changed = 1; |
723 | } |
724 | if (it->max > rmax) { |
725 | it->max = rmax; |
726 | it->openmax = 0; |
727 | changed = 1; |
728 | } |
729 | if (snd_interval_checkempty(it)) { |
730 | it->empty = 1; |
731 | return -EINVAL; |
732 | } |
733 | hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); |
734 | return changed; |
735 | } |
736 | |
737 | static int hw_rule_format(struct snd_pcm_hw_params *params, |
738 | struct snd_pcm_hw_rule *rule) |
739 | { |
740 | struct snd_usb_substream *subs = rule->private; |
741 | struct list_head *p; |
742 | struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); |
743 | u64 fbits; |
744 | u32 oldbits[2]; |
745 | int changed; |
746 | |
747 | hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); |
748 | fbits = 0; |
749 | list_for_each(p, &subs->fmt_list) { |
750 | struct audioformat *fp; |
751 | fp = list_entry(p, struct audioformat, list); |
752 | if (!hw_check_valid_format(subs, params, fp)) |
753 | continue; |
754 | fbits |= fp->formats; |
755 | } |
756 | |
757 | oldbits[0] = fmt->bits[0]; |
758 | oldbits[1] = fmt->bits[1]; |
759 | fmt->bits[0] &= (u32)fbits; |
760 | fmt->bits[1] &= (u32)(fbits >> 32); |
761 | if (!fmt->bits[0] && !fmt->bits[1]) { |
762 | hwc_debug(" --> get empty\n"); |
763 | return -EINVAL; |
764 | } |
765 | changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); |
766 | hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); |
767 | return changed; |
768 | } |
769 | |
770 | static int hw_rule_period_time(struct snd_pcm_hw_params *params, |
771 | struct snd_pcm_hw_rule *rule) |
772 | { |
773 | struct snd_usb_substream *subs = rule->private; |
774 | struct audioformat *fp; |
775 | struct snd_interval *it; |
776 | unsigned char min_datainterval; |
777 | unsigned int pmin; |
778 | int changed; |
779 | |
780 | it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); |
781 | hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); |
782 | min_datainterval = 0xff; |
783 | list_for_each_entry(fp, &subs->fmt_list, list) { |
784 | if (!hw_check_valid_format(subs, params, fp)) |
785 | continue; |
786 | min_datainterval = min(min_datainterval, fp->datainterval); |
787 | } |
788 | if (min_datainterval == 0xff) { |
789 | hwc_debug(" --> get empty\n"); |
790 | it->empty = 1; |
791 | return -EINVAL; |
792 | } |
793 | pmin = 125 * (1 << min_datainterval); |
794 | changed = 0; |
795 | if (it->min < pmin) { |
796 | it->min = pmin; |
797 | it->openmin = 0; |
798 | changed = 1; |
799 | } |
800 | if (snd_interval_checkempty(it)) { |
801 | it->empty = 1; |
802 | return -EINVAL; |
803 | } |
804 | hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); |
805 | return changed; |
806 | } |
807 | |
808 | /* |
809 | * If the device supports unusual bit rates, does the request meet these? |
810 | */ |
811 | static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, |
812 | struct snd_usb_substream *subs) |
813 | { |
814 | struct audioformat *fp; |
815 | int *rate_list; |
816 | int count = 0, needs_knot = 0; |
817 | int err; |
818 | |
819 | kfree(subs->rate_list.list); |
820 | subs->rate_list.list = NULL; |
821 | |
822 | list_for_each_entry(fp, &subs->fmt_list, list) { |
823 | if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) |
824 | return 0; |
825 | count += fp->nr_rates; |
826 | if (fp->rates & SNDRV_PCM_RATE_KNOT) |
827 | needs_knot = 1; |
828 | } |
829 | if (!needs_knot) |
830 | return 0; |
831 | |
832 | subs->rate_list.list = rate_list = |
833 | kmalloc(sizeof(int) * count, GFP_KERNEL); |
834 | if (!subs->rate_list.list) |
835 | return -ENOMEM; |
836 | subs->rate_list.count = count; |
837 | subs->rate_list.mask = 0; |
838 | count = 0; |
839 | list_for_each_entry(fp, &subs->fmt_list, list) { |
840 | int i; |
841 | for (i = 0; i < fp->nr_rates; i++) |
842 | rate_list[count++] = fp->rate_table[i]; |
843 | } |
844 | err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, |
845 | &subs->rate_list); |
846 | if (err < 0) |
847 | return err; |
848 | |
849 | return 0; |
850 | } |
851 | |
852 | |
853 | /* |
854 | * set up the runtime hardware information. |
855 | */ |
856 | |
857 | static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) |
858 | { |
859 | struct list_head *p; |
860 | unsigned int pt, ptmin; |
861 | int param_period_time_if_needed; |
862 | int err; |
863 | |
864 | runtime->hw.formats = subs->formats; |
865 | |
866 | runtime->hw.rate_min = 0x7fffffff; |
867 | runtime->hw.rate_max = 0; |
868 | runtime->hw.channels_min = 256; |
869 | runtime->hw.channels_max = 0; |
870 | runtime->hw.rates = 0; |
871 | ptmin = UINT_MAX; |
872 | /* check min/max rates and channels */ |
873 | list_for_each(p, &subs->fmt_list) { |
874 | struct audioformat *fp; |
875 | fp = list_entry(p, struct audioformat, list); |
876 | runtime->hw.rates |= fp->rates; |
877 | if (runtime->hw.rate_min > fp->rate_min) |
878 | runtime->hw.rate_min = fp->rate_min; |
879 | if (runtime->hw.rate_max < fp->rate_max) |
880 | runtime->hw.rate_max = fp->rate_max; |
881 | if (runtime->hw.channels_min > fp->channels) |
882 | runtime->hw.channels_min = fp->channels; |
883 | if (runtime->hw.channels_max < fp->channels) |
884 | runtime->hw.channels_max = fp->channels; |
885 | if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { |
886 | /* FIXME: there might be more than one audio formats... */ |
887 | runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = |
888 | fp->frame_size; |
889 | } |
890 | pt = 125 * (1 << fp->datainterval); |
891 | ptmin = min(ptmin, pt); |
892 | } |
893 | err = snd_usb_autoresume(subs->stream->chip); |
894 | if (err < 0) |
895 | return err; |
896 | |
897 | param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; |
898 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) |
899 | /* full speed devices have fixed data packet interval */ |
900 | ptmin = 1000; |
901 | if (ptmin == 1000) |
902 | /* if period time doesn't go below 1 ms, no rules needed */ |
903 | param_period_time_if_needed = -1; |
904 | snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, |
905 | ptmin, UINT_MAX); |
906 | |
907 | if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, |
908 | hw_rule_rate, subs, |
909 | SNDRV_PCM_HW_PARAM_FORMAT, |
910 | SNDRV_PCM_HW_PARAM_CHANNELS, |
911 | param_period_time_if_needed, |
912 | -1)) < 0) |
913 | goto rep_err; |
914 | if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, |
915 | hw_rule_channels, subs, |
916 | SNDRV_PCM_HW_PARAM_FORMAT, |
917 | SNDRV_PCM_HW_PARAM_RATE, |
918 | param_period_time_if_needed, |
919 | -1)) < 0) |
920 | goto rep_err; |
921 | if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, |
922 | hw_rule_format, subs, |
923 | SNDRV_PCM_HW_PARAM_RATE, |
924 | SNDRV_PCM_HW_PARAM_CHANNELS, |
925 | param_period_time_if_needed, |
926 | -1)) < 0) |
927 | goto rep_err; |
928 | if (param_period_time_if_needed >= 0) { |
929 | err = snd_pcm_hw_rule_add(runtime, 0, |
930 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, |
931 | hw_rule_period_time, subs, |
932 | SNDRV_PCM_HW_PARAM_FORMAT, |
933 | SNDRV_PCM_HW_PARAM_CHANNELS, |
934 | SNDRV_PCM_HW_PARAM_RATE, |
935 | -1); |
936 | if (err < 0) |
937 | goto rep_err; |
938 | } |
939 | if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) |
940 | goto rep_err; |
941 | return 0; |
942 | |
943 | rep_err: |
944 | snd_usb_autosuspend(subs->stream->chip); |
945 | return err; |
946 | } |
947 | |
948 | static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) |
949 | { |
950 | struct snd_usb_stream *as = snd_pcm_substream_chip(substream); |
951 | struct snd_pcm_runtime *runtime = substream->runtime; |
952 | struct snd_usb_substream *subs = &as->substream[direction]; |
953 | |
954 | subs->interface = -1; |
955 | subs->altset_idx = 0; |
956 | runtime->hw = snd_usb_hardware; |
957 | runtime->private_data = subs; |
958 | subs->pcm_substream = substream; |
959 | /* runtime PM is also done there */ |
960 | return setup_hw_info(runtime, subs); |
961 | } |
962 | |
963 | static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) |
964 | { |
965 | struct snd_usb_stream *as = snd_pcm_substream_chip(substream); |
966 | struct snd_usb_substream *subs = &as->substream[direction]; |
967 | |
968 | stop_endpoints(subs, 0, 0, 0); |
969 | |
970 | if (!as->chip->shutdown && subs->interface >= 0) { |
971 | usb_set_interface(subs->dev, subs->interface, 0); |
972 | subs->interface = -1; |
973 | } |
974 | |
975 | subs->pcm_substream = NULL; |
976 | snd_usb_autosuspend(subs->stream->chip); |
977 | |
978 | return 0; |
979 | } |
980 | |
981 | /* Since a URB can handle only a single linear buffer, we must use double |
982 | * buffering when the data to be transferred overflows the buffer boundary. |
983 | * To avoid inconsistencies when updating hwptr_done, we use double buffering |
984 | * for all URBs. |
985 | */ |
986 | static void retire_capture_urb(struct snd_usb_substream *subs, |
987 | struct urb *urb) |
988 | { |
989 | struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; |
990 | unsigned int stride, frames, bytes, oldptr; |
991 | int i, period_elapsed = 0; |
992 | unsigned long flags; |
993 | unsigned char *cp; |
994 | |
995 | stride = runtime->frame_bits >> 3; |
996 | |
997 | for (i = 0; i < urb->number_of_packets; i++) { |
998 | cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; |
999 | if (urb->iso_frame_desc[i].status && printk_ratelimit()) { |
1000 | snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status); |
1001 | // continue; |
1002 | } |
1003 | bytes = urb->iso_frame_desc[i].actual_length; |
1004 | frames = bytes / stride; |
1005 | if (!subs->txfr_quirk) |
1006 | bytes = frames * stride; |
1007 | if (bytes % (runtime->sample_bits >> 3) != 0) { |
1008 | #ifdef CONFIG_SND_DEBUG_VERBOSE |
1009 | int oldbytes = bytes; |
1010 | #endif |
1011 | bytes = frames * stride; |
1012 | snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", |
1013 | oldbytes, bytes); |
1014 | } |
1015 | /* update the current pointer */ |
1016 | spin_lock_irqsave(&subs->lock, flags); |
1017 | oldptr = subs->hwptr_done; |
1018 | subs->hwptr_done += bytes; |
1019 | if (subs->hwptr_done >= runtime->buffer_size * stride) |
1020 | subs->hwptr_done -= runtime->buffer_size * stride; |
1021 | frames = (bytes + (oldptr % stride)) / stride; |
1022 | subs->transfer_done += frames; |
1023 | if (subs->transfer_done >= runtime->period_size) { |
1024 | subs->transfer_done -= runtime->period_size; |
1025 | period_elapsed = 1; |
1026 | } |
1027 | spin_unlock_irqrestore(&subs->lock, flags); |
1028 | /* copy a data chunk */ |
1029 | if (oldptr + bytes > runtime->buffer_size * stride) { |
1030 | unsigned int bytes1 = |
1031 | runtime->buffer_size * stride - oldptr; |
1032 | memcpy(runtime->dma_area + oldptr, cp, bytes1); |
1033 | memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); |
1034 | } else { |
1035 | memcpy(runtime->dma_area + oldptr, cp, bytes); |
1036 | } |
1037 | } |
1038 | |
1039 | if (period_elapsed) |
1040 | snd_pcm_period_elapsed(subs->pcm_substream); |
1041 | } |
1042 | |
1043 | static void prepare_playback_urb(struct snd_usb_substream *subs, |
1044 | struct urb *urb) |
1045 | { |
1046 | struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; |
1047 | struct snd_usb_endpoint *ep = subs->data_endpoint; |
1048 | struct snd_urb_ctx *ctx = urb->context; |
1049 | unsigned int counts, frames, bytes; |
1050 | int i, stride, period_elapsed = 0; |
1051 | unsigned long flags; |
1052 | |
1053 | stride = runtime->frame_bits >> 3; |
1054 | |
1055 | frames = 0; |
1056 | urb->number_of_packets = 0; |
1057 | spin_lock_irqsave(&subs->lock, flags); |
1058 | for (i = 0; i < ctx->packets; i++) { |
1059 | if (ctx->packet_size[i]) |
1060 | counts = ctx->packet_size[i]; |
1061 | else |
1062 | counts = snd_usb_endpoint_next_packet_size(ep); |
1063 | |
1064 | /* set up descriptor */ |
1065 | urb->iso_frame_desc[i].offset = frames * stride; |
1066 | urb->iso_frame_desc[i].length = counts * stride; |
1067 | frames += counts; |
1068 | urb->number_of_packets++; |
1069 | subs->transfer_done += counts; |
1070 | if (subs->transfer_done >= runtime->period_size) { |
1071 | subs->transfer_done -= runtime->period_size; |
1072 | period_elapsed = 1; |
1073 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) { |
1074 | if (subs->transfer_done > 0) { |
1075 | /* FIXME: fill-max mode is not |
1076 | * supported yet */ |
1077 | frames -= subs->transfer_done; |
1078 | counts -= subs->transfer_done; |
1079 | urb->iso_frame_desc[i].length = |
1080 | counts * stride; |
1081 | subs->transfer_done = 0; |
1082 | } |
1083 | i++; |
1084 | if (i < ctx->packets) { |
1085 | /* add a transfer delimiter */ |
1086 | urb->iso_frame_desc[i].offset = |
1087 | frames * stride; |
1088 | urb->iso_frame_desc[i].length = 0; |
1089 | urb->number_of_packets++; |
1090 | } |
1091 | break; |
1092 | } |
1093 | } |
1094 | if (period_elapsed && |
1095 | !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */ |
1096 | break; |
1097 | } |
1098 | bytes = frames * stride; |
1099 | if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { |
1100 | /* err, the transferred area goes over buffer boundary. */ |
1101 | unsigned int bytes1 = |
1102 | runtime->buffer_size * stride - subs->hwptr_done; |
1103 | memcpy(urb->transfer_buffer, |
1104 | runtime->dma_area + subs->hwptr_done, bytes1); |
1105 | memcpy(urb->transfer_buffer + bytes1, |
1106 | runtime->dma_area, bytes - bytes1); |
1107 | } else { |
1108 | memcpy(urb->transfer_buffer, |
1109 | runtime->dma_area + subs->hwptr_done, bytes); |
1110 | } |
1111 | subs->hwptr_done += bytes; |
1112 | if (subs->hwptr_done >= runtime->buffer_size * stride) |
1113 | subs->hwptr_done -= runtime->buffer_size * stride; |
1114 | |
1115 | /* update delay with exact number of samples queued */ |
1116 | runtime->delay = subs->last_delay; |
1117 | runtime->delay += frames; |
1118 | subs->last_delay = runtime->delay; |
1119 | |
1120 | /* realign last_frame_number */ |
1121 | subs->last_frame_number = usb_get_current_frame_number(subs->dev); |
1122 | subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ |
1123 | |
1124 | spin_unlock_irqrestore(&subs->lock, flags); |
1125 | urb->transfer_buffer_length = bytes; |
1126 | if (period_elapsed) |
1127 | snd_pcm_period_elapsed(subs->pcm_substream); |
1128 | } |
1129 | |
1130 | /* |
1131 | * process after playback data complete |
1132 | * - decrease the delay count again |
1133 | */ |
1134 | static void retire_playback_urb(struct snd_usb_substream *subs, |
1135 | struct urb *urb) |
1136 | { |
1137 | unsigned long flags; |
1138 | struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; |
1139 | int stride = runtime->frame_bits >> 3; |
1140 | int processed = urb->transfer_buffer_length / stride; |
1141 | int est_delay; |
1142 | |
1143 | /* ignore the delay accounting when procssed=0 is given, i.e. |
1144 | * silent payloads are procssed before handling the actual data |
1145 | */ |
1146 | if (!processed) |
1147 | return; |
1148 | |
1149 | spin_lock_irqsave(&subs->lock, flags); |
1150 | est_delay = snd_usb_pcm_delay(subs, runtime->rate); |
1151 | /* update delay with exact number of samples played */ |
1152 | if (processed > subs->last_delay) |
1153 | subs->last_delay = 0; |
1154 | else |
1155 | subs->last_delay -= processed; |
1156 | runtime->delay = subs->last_delay; |
1157 | |
1158 | /* |
1159 | * Report when delay estimate is off by more than 2ms. |
1160 | * The error should be lower than 2ms since the estimate relies |
1161 | * on two reads of a counter updated every ms. |
1162 | */ |
1163 | if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) |
1164 | snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", |
1165 | est_delay, subs->last_delay); |
1166 | |
1167 | spin_unlock_irqrestore(&subs->lock, flags); |
1168 | } |
1169 | |
1170 | static int snd_usb_playback_open(struct snd_pcm_substream *substream) |
1171 | { |
1172 | return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); |
1173 | } |
1174 | |
1175 | static int snd_usb_playback_close(struct snd_pcm_substream *substream) |
1176 | { |
1177 | return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); |
1178 | } |
1179 | |
1180 | static int snd_usb_capture_open(struct snd_pcm_substream *substream) |
1181 | { |
1182 | return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); |
1183 | } |
1184 | |
1185 | static int snd_usb_capture_close(struct snd_pcm_substream *substream) |
1186 | { |
1187 | return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); |
1188 | } |
1189 | |
1190 | static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, |
1191 | int cmd) |
1192 | { |
1193 | struct snd_usb_substream *subs = substream->runtime->private_data; |
1194 | |
1195 | switch (cmd) { |
1196 | case SNDRV_PCM_TRIGGER_START: |
1197 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
1198 | subs->data_endpoint->prepare_data_urb = prepare_playback_urb; |
1199 | subs->data_endpoint->retire_data_urb = retire_playback_urb; |
1200 | subs->running = 1; |
1201 | return 0; |
1202 | case SNDRV_PCM_TRIGGER_STOP: |
1203 | stop_endpoints(subs, 0, 0, 0); |
1204 | subs->running = 0; |
1205 | return 0; |
1206 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
1207 | subs->data_endpoint->prepare_data_urb = NULL; |
1208 | subs->data_endpoint->retire_data_urb = NULL; |
1209 | subs->running = 0; |
1210 | return 0; |
1211 | } |
1212 | |
1213 | return -EINVAL; |
1214 | } |
1215 | |
1216 | static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, |
1217 | int cmd) |
1218 | { |
1219 | int err; |
1220 | struct snd_usb_substream *subs = substream->runtime->private_data; |
1221 | |
1222 | switch (cmd) { |
1223 | case SNDRV_PCM_TRIGGER_START: |
1224 | err = start_endpoints(subs, 0); |
1225 | if (err < 0) |
1226 | return err; |
1227 | |
1228 | subs->data_endpoint->retire_data_urb = retire_capture_urb; |
1229 | subs->running = 1; |
1230 | return 0; |
1231 | case SNDRV_PCM_TRIGGER_STOP: |
1232 | stop_endpoints(subs, 0, 0, 0); |
1233 | subs->running = 0; |
1234 | return 0; |
1235 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
1236 | subs->data_endpoint->retire_data_urb = NULL; |
1237 | subs->running = 0; |
1238 | return 0; |
1239 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
1240 | subs->data_endpoint->retire_data_urb = retire_capture_urb; |
1241 | subs->running = 1; |
1242 | return 0; |
1243 | } |
1244 | |
1245 | return -EINVAL; |
1246 | } |
1247 | |
1248 | static struct snd_pcm_ops snd_usb_playback_ops = { |
1249 | .open = snd_usb_playback_open, |
1250 | .close = snd_usb_playback_close, |
1251 | .ioctl = snd_pcm_lib_ioctl, |
1252 | .hw_params = snd_usb_hw_params, |
1253 | .hw_free = snd_usb_hw_free, |
1254 | .prepare = snd_usb_pcm_prepare, |
1255 | .trigger = snd_usb_substream_playback_trigger, |
1256 | .pointer = snd_usb_pcm_pointer, |
1257 | .page = snd_pcm_lib_get_vmalloc_page, |
1258 | .mmap = snd_pcm_lib_mmap_vmalloc, |
1259 | }; |
1260 | |
1261 | static struct snd_pcm_ops snd_usb_capture_ops = { |
1262 | .open = snd_usb_capture_open, |
1263 | .close = snd_usb_capture_close, |
1264 | .ioctl = snd_pcm_lib_ioctl, |
1265 | .hw_params = snd_usb_hw_params, |
1266 | .hw_free = snd_usb_hw_free, |
1267 | .prepare = snd_usb_pcm_prepare, |
1268 | .trigger = snd_usb_substream_capture_trigger, |
1269 | .pointer = snd_usb_pcm_pointer, |
1270 | .page = snd_pcm_lib_get_vmalloc_page, |
1271 | .mmap = snd_pcm_lib_mmap_vmalloc, |
1272 | }; |
1273 | |
1274 | void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) |
1275 | { |
1276 | snd_pcm_set_ops(pcm, stream, |
1277 | stream == SNDRV_PCM_STREAM_PLAYBACK ? |
1278 | &snd_usb_playback_ops : &snd_usb_capture_ops); |
1279 | } |
1280 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9