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e5779998 DM |
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 | ||
c731bc96 DM |
18 | #include <linux/gfp.h> |
19 | #include <linux/init.h> | |
80c8a2a3 | 20 | #include <linux/ratelimit.h> |
c731bc96 DM |
21 | #include <linux/usb.h> |
22 | #include <linux/usb/audio.h> | |
8fdff6a3 | 23 | #include <linux/slab.h> |
c731bc96 DM |
24 | |
25 | #include <sound/core.h> | |
26 | #include <sound/pcm.h> | |
8fdff6a3 | 27 | #include <sound/pcm_params.h> |
c731bc96 DM |
28 | |
29 | #include "usbaudio.h" | |
30 | #include "helper.h" | |
31 | #include "card.h" | |
32 | #include "endpoint.h" | |
33 | #include "pcm.h" | |
34 | ||
8fdff6a3 DM |
35 | #define EP_FLAG_ACTIVATED 0 |
36 | #define EP_FLAG_RUNNING 1 | |
37 | ||
c731bc96 DM |
38 | /* |
39 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) | |
40 | * this will overflow at approx 524 kHz | |
41 | */ | |
42 | static inline unsigned get_usb_full_speed_rate(unsigned int rate) | |
43 | { | |
44 | return ((rate << 13) + 62) / 125; | |
45 | } | |
46 | ||
47 | /* | |
48 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) | |
49 | * this will overflow at approx 4 MHz | |
50 | */ | |
51 | static inline unsigned get_usb_high_speed_rate(unsigned int rate) | |
52 | { | |
53 | return ((rate << 10) + 62) / 125; | |
54 | } | |
55 | ||
56 | /* | |
57 | * unlink active urbs. | |
58 | */ | |
8fdff6a3 | 59 | static int deactivate_urbs_old(struct snd_usb_substream *subs, int force, int can_sleep) |
c731bc96 DM |
60 | { |
61 | struct snd_usb_audio *chip = subs->stream->chip; | |
62 | unsigned int i; | |
63 | int async; | |
64 | ||
65 | subs->running = 0; | |
66 | ||
67 | if (!force && subs->stream->chip->shutdown) /* to be sure... */ | |
68 | return -EBADFD; | |
69 | ||
70 | async = !can_sleep && chip->async_unlink; | |
71 | ||
72 | if (!async && in_interrupt()) | |
73 | return 0; | |
74 | ||
75 | for (i = 0; i < subs->nurbs; i++) { | |
76 | if (test_bit(i, &subs->active_mask)) { | |
77 | if (!test_and_set_bit(i, &subs->unlink_mask)) { | |
78 | struct urb *u = subs->dataurb[i].urb; | |
79 | if (async) | |
80 | usb_unlink_urb(u); | |
81 | else | |
82 | usb_kill_urb(u); | |
83 | } | |
84 | } | |
85 | } | |
86 | if (subs->syncpipe) { | |
87 | for (i = 0; i < SYNC_URBS; i++) { | |
88 | if (test_bit(i+16, &subs->active_mask)) { | |
89 | if (!test_and_set_bit(i+16, &subs->unlink_mask)) { | |
90 | struct urb *u = subs->syncurb[i].urb; | |
91 | if (async) | |
92 | usb_unlink_urb(u); | |
93 | else | |
94 | usb_kill_urb(u); | |
95 | } | |
96 | } | |
97 | } | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
102 | ||
103 | /* | |
104 | * release a urb data | |
105 | */ | |
106 | static void release_urb_ctx(struct snd_urb_ctx *u) | |
107 | { | |
108 | if (u->urb) { | |
109 | if (u->buffer_size) | |
110 | usb_free_coherent(u->subs->dev, u->buffer_size, | |
111 | u->urb->transfer_buffer, | |
112 | u->urb->transfer_dma); | |
113 | usb_free_urb(u->urb); | |
114 | u->urb = NULL; | |
115 | } | |
116 | } | |
117 | ||
118 | /* | |
119 | * wait until all urbs are processed. | |
120 | */ | |
8fdff6a3 | 121 | static int wait_clear_urbs_old(struct snd_usb_substream *subs) |
c731bc96 DM |
122 | { |
123 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); | |
124 | unsigned int i; | |
125 | int alive; | |
126 | ||
127 | do { | |
128 | alive = 0; | |
129 | for (i = 0; i < subs->nurbs; i++) { | |
130 | if (test_bit(i, &subs->active_mask)) | |
131 | alive++; | |
132 | } | |
133 | if (subs->syncpipe) { | |
134 | for (i = 0; i < SYNC_URBS; i++) { | |
135 | if (test_bit(i + 16, &subs->active_mask)) | |
136 | alive++; | |
137 | } | |
138 | } | |
139 | if (! alive) | |
140 | break; | |
141 | schedule_timeout_uninterruptible(1); | |
142 | } while (time_before(jiffies, end_time)); | |
143 | if (alive) | |
144 | snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /* | |
149 | * release a substream | |
150 | */ | |
151 | void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force) | |
152 | { | |
153 | int i; | |
154 | ||
155 | /* stop urbs (to be sure) */ | |
8fdff6a3 DM |
156 | deactivate_urbs_old(subs, force, 1); |
157 | wait_clear_urbs_old(subs); | |
c731bc96 DM |
158 | |
159 | for (i = 0; i < MAX_URBS; i++) | |
160 | release_urb_ctx(&subs->dataurb[i]); | |
161 | for (i = 0; i < SYNC_URBS; i++) | |
162 | release_urb_ctx(&subs->syncurb[i]); | |
163 | usb_free_coherent(subs->dev, SYNC_URBS * 4, | |
164 | subs->syncbuf, subs->sync_dma); | |
165 | subs->syncbuf = NULL; | |
166 | subs->nurbs = 0; | |
167 | } | |
168 | ||
169 | /* | |
170 | * complete callback from data urb | |
171 | */ | |
8fdff6a3 | 172 | static void snd_complete_urb_old(struct urb *urb) |
c731bc96 DM |
173 | { |
174 | struct snd_urb_ctx *ctx = urb->context; | |
175 | struct snd_usb_substream *subs = ctx->subs; | |
176 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; | |
177 | int err = 0; | |
178 | ||
179 | if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) || | |
180 | !subs->running || /* can be stopped during retire callback */ | |
181 | (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 || | |
182 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
183 | clear_bit(ctx->index, &subs->active_mask); | |
184 | if (err < 0) { | |
185 | snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err); | |
186 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
187 | } | |
188 | } | |
189 | } | |
190 | ||
191 | ||
192 | /* | |
193 | * complete callback from sync urb | |
194 | */ | |
195 | static void snd_complete_sync_urb(struct urb *urb) | |
196 | { | |
197 | struct snd_urb_ctx *ctx = urb->context; | |
198 | struct snd_usb_substream *subs = ctx->subs; | |
199 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; | |
200 | int err = 0; | |
201 | ||
202 | if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) || | |
203 | !subs->running || /* can be stopped during retire callback */ | |
204 | (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 || | |
205 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
206 | clear_bit(ctx->index + 16, &subs->active_mask); | |
207 | if (err < 0) { | |
208 | snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err); | |
209 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | ||
215 | /* | |
216 | * initialize a substream for plaback/capture | |
217 | */ | |
218 | int snd_usb_init_substream_urbs(struct snd_usb_substream *subs, | |
219 | unsigned int period_bytes, | |
220 | unsigned int rate, | |
221 | unsigned int frame_bits) | |
222 | { | |
223 | unsigned int maxsize, i; | |
224 | int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; | |
225 | unsigned int urb_packs, total_packs, packs_per_ms; | |
226 | struct snd_usb_audio *chip = subs->stream->chip; | |
227 | ||
228 | /* calculate the frequency in 16.16 format */ | |
229 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) | |
230 | subs->freqn = get_usb_full_speed_rate(rate); | |
231 | else | |
232 | subs->freqn = get_usb_high_speed_rate(rate); | |
233 | subs->freqm = subs->freqn; | |
234 | subs->freqshift = INT_MIN; | |
235 | /* calculate max. frequency */ | |
236 | if (subs->maxpacksize) { | |
237 | /* whatever fits into a max. size packet */ | |
238 | maxsize = subs->maxpacksize; | |
239 | subs->freqmax = (maxsize / (frame_bits >> 3)) | |
240 | << (16 - subs->datainterval); | |
241 | } else { | |
242 | /* no max. packet size: just take 25% higher than nominal */ | |
243 | subs->freqmax = subs->freqn + (subs->freqn >> 2); | |
244 | maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) | |
245 | >> (16 - subs->datainterval); | |
246 | } | |
247 | subs->phase = 0; | |
248 | ||
249 | if (subs->fill_max) | |
250 | subs->curpacksize = subs->maxpacksize; | |
251 | else | |
252 | subs->curpacksize = maxsize; | |
253 | ||
254 | if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) | |
255 | packs_per_ms = 8 >> subs->datainterval; | |
256 | else | |
257 | packs_per_ms = 1; | |
258 | ||
259 | if (is_playback) { | |
260 | urb_packs = max(chip->nrpacks, 1); | |
261 | urb_packs = min(urb_packs, (unsigned int)MAX_PACKS); | |
262 | } else | |
263 | urb_packs = 1; | |
264 | urb_packs *= packs_per_ms; | |
265 | if (subs->syncpipe) | |
266 | urb_packs = min(urb_packs, 1U << subs->syncinterval); | |
267 | ||
268 | /* decide how many packets to be used */ | |
269 | if (is_playback) { | |
270 | unsigned int minsize, maxpacks; | |
271 | /* determine how small a packet can be */ | |
272 | minsize = (subs->freqn >> (16 - subs->datainterval)) | |
273 | * (frame_bits >> 3); | |
274 | /* with sync from device, assume it can be 12% lower */ | |
275 | if (subs->syncpipe) | |
276 | minsize -= minsize >> 3; | |
277 | minsize = max(minsize, 1u); | |
278 | total_packs = (period_bytes + minsize - 1) / minsize; | |
279 | /* we need at least two URBs for queueing */ | |
280 | if (total_packs < 2) { | |
281 | total_packs = 2; | |
282 | } else { | |
283 | /* and we don't want too long a queue either */ | |
284 | maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); | |
285 | total_packs = min(total_packs, maxpacks); | |
286 | } | |
287 | } else { | |
288 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) | |
289 | urb_packs >>= 1; | |
290 | total_packs = MAX_URBS * urb_packs; | |
291 | } | |
292 | subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; | |
293 | if (subs->nurbs > MAX_URBS) { | |
294 | /* too much... */ | |
295 | subs->nurbs = MAX_URBS; | |
296 | total_packs = MAX_URBS * urb_packs; | |
297 | } else if (subs->nurbs < 2) { | |
298 | /* too little - we need at least two packets | |
299 | * to ensure contiguous playback/capture | |
300 | */ | |
301 | subs->nurbs = 2; | |
302 | } | |
303 | ||
304 | /* allocate and initialize data urbs */ | |
305 | for (i = 0; i < subs->nurbs; i++) { | |
306 | struct snd_urb_ctx *u = &subs->dataurb[i]; | |
307 | u->index = i; | |
308 | u->subs = subs; | |
309 | u->packets = (i + 1) * total_packs / subs->nurbs | |
310 | - i * total_packs / subs->nurbs; | |
311 | u->buffer_size = maxsize * u->packets; | |
312 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) | |
313 | u->packets++; /* for transfer delimiter */ | |
314 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); | |
315 | if (!u->urb) | |
316 | goto out_of_memory; | |
317 | u->urb->transfer_buffer = | |
318 | usb_alloc_coherent(subs->dev, u->buffer_size, | |
319 | GFP_KERNEL, &u->urb->transfer_dma); | |
320 | if (!u->urb->transfer_buffer) | |
321 | goto out_of_memory; | |
322 | u->urb->pipe = subs->datapipe; | |
323 | u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
324 | u->urb->interval = 1 << subs->datainterval; | |
325 | u->urb->context = u; | |
8fdff6a3 | 326 | u->urb->complete = snd_complete_urb_old; |
c731bc96 DM |
327 | } |
328 | ||
329 | if (subs->syncpipe) { | |
330 | /* allocate and initialize sync urbs */ | |
331 | subs->syncbuf = usb_alloc_coherent(subs->dev, SYNC_URBS * 4, | |
332 | GFP_KERNEL, &subs->sync_dma); | |
333 | if (!subs->syncbuf) | |
334 | goto out_of_memory; | |
335 | for (i = 0; i < SYNC_URBS; i++) { | |
336 | struct snd_urb_ctx *u = &subs->syncurb[i]; | |
337 | u->index = i; | |
338 | u->subs = subs; | |
339 | u->packets = 1; | |
340 | u->urb = usb_alloc_urb(1, GFP_KERNEL); | |
341 | if (!u->urb) | |
342 | goto out_of_memory; | |
343 | u->urb->transfer_buffer = subs->syncbuf + i * 4; | |
344 | u->urb->transfer_dma = subs->sync_dma + i * 4; | |
345 | u->urb->transfer_buffer_length = 4; | |
346 | u->urb->pipe = subs->syncpipe; | |
347 | u->urb->transfer_flags = URB_ISO_ASAP | | |
348 | URB_NO_TRANSFER_DMA_MAP; | |
349 | u->urb->number_of_packets = 1; | |
350 | u->urb->interval = 1 << subs->syncinterval; | |
351 | u->urb->context = u; | |
352 | u->urb->complete = snd_complete_sync_urb; | |
353 | } | |
354 | } | |
355 | return 0; | |
356 | ||
357 | out_of_memory: | |
358 | snd_usb_release_substream_urbs(subs, 0); | |
359 | return -ENOMEM; | |
360 | } | |
361 | ||
362 | /* | |
363 | * prepare urb for full speed capture sync pipe | |
364 | * | |
365 | * fill the length and offset of each urb descriptor. | |
366 | * the fixed 10.14 frequency is passed through the pipe. | |
367 | */ | |
368 | static int prepare_capture_sync_urb(struct snd_usb_substream *subs, | |
369 | struct snd_pcm_runtime *runtime, | |
370 | struct urb *urb) | |
371 | { | |
372 | unsigned char *cp = urb->transfer_buffer; | |
373 | struct snd_urb_ctx *ctx = urb->context; | |
374 | ||
375 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
376 | urb->iso_frame_desc[0].length = 3; | |
377 | urb->iso_frame_desc[0].offset = 0; | |
378 | cp[0] = subs->freqn >> 2; | |
379 | cp[1] = subs->freqn >> 10; | |
380 | cp[2] = subs->freqn >> 18; | |
381 | return 0; | |
382 | } | |
383 | ||
384 | /* | |
385 | * prepare urb for high speed capture sync pipe | |
386 | * | |
387 | * fill the length and offset of each urb descriptor. | |
388 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. | |
389 | */ | |
390 | static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs, | |
391 | struct snd_pcm_runtime *runtime, | |
392 | struct urb *urb) | |
393 | { | |
394 | unsigned char *cp = urb->transfer_buffer; | |
395 | struct snd_urb_ctx *ctx = urb->context; | |
396 | ||
397 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
398 | urb->iso_frame_desc[0].length = 4; | |
399 | urb->iso_frame_desc[0].offset = 0; | |
400 | cp[0] = subs->freqn; | |
401 | cp[1] = subs->freqn >> 8; | |
402 | cp[2] = subs->freqn >> 16; | |
403 | cp[3] = subs->freqn >> 24; | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /* | |
408 | * process after capture sync complete | |
409 | * - nothing to do | |
410 | */ | |
411 | static int retire_capture_sync_urb(struct snd_usb_substream *subs, | |
412 | struct snd_pcm_runtime *runtime, | |
413 | struct urb *urb) | |
414 | { | |
415 | return 0; | |
416 | } | |
417 | ||
418 | /* | |
419 | * prepare urb for capture data pipe | |
420 | * | |
421 | * fill the offset and length of each descriptor. | |
422 | * | |
423 | * we use a temporary buffer to write the captured data. | |
424 | * since the length of written data is determined by host, we cannot | |
425 | * write onto the pcm buffer directly... the data is thus copied | |
426 | * later at complete callback to the global buffer. | |
427 | */ | |
428 | static int prepare_capture_urb(struct snd_usb_substream *subs, | |
429 | struct snd_pcm_runtime *runtime, | |
430 | struct urb *urb) | |
431 | { | |
432 | int i, offs; | |
433 | struct snd_urb_ctx *ctx = urb->context; | |
434 | ||
435 | offs = 0; | |
436 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
437 | for (i = 0; i < ctx->packets; i++) { | |
438 | urb->iso_frame_desc[i].offset = offs; | |
439 | urb->iso_frame_desc[i].length = subs->curpacksize; | |
440 | offs += subs->curpacksize; | |
441 | } | |
442 | urb->transfer_buffer_length = offs; | |
443 | urb->number_of_packets = ctx->packets; | |
444 | return 0; | |
445 | } | |
446 | ||
447 | /* | |
448 | * process after capture complete | |
449 | * | |
450 | * copy the data from each desctiptor to the pcm buffer, and | |
451 | * update the current position. | |
452 | */ | |
453 | static int retire_capture_urb(struct snd_usb_substream *subs, | |
454 | struct snd_pcm_runtime *runtime, | |
455 | struct urb *urb) | |
456 | { | |
457 | unsigned long flags; | |
458 | unsigned char *cp; | |
459 | int i; | |
460 | unsigned int stride, frames, bytes, oldptr; | |
461 | int period_elapsed = 0; | |
462 | ||
463 | stride = runtime->frame_bits >> 3; | |
464 | ||
465 | for (i = 0; i < urb->number_of_packets; i++) { | |
466 | cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
80c8a2a3 TI |
467 | if (urb->iso_frame_desc[i].status && printk_ratelimit()) { |
468 | snd_printdd("frame %d active: %d\n", i, urb->iso_frame_desc[i].status); | |
c731bc96 DM |
469 | // continue; |
470 | } | |
471 | bytes = urb->iso_frame_desc[i].actual_length; | |
472 | frames = bytes / stride; | |
473 | if (!subs->txfr_quirk) | |
474 | bytes = frames * stride; | |
475 | if (bytes % (runtime->sample_bits >> 3) != 0) { | |
476 | #ifdef CONFIG_SND_DEBUG_VERBOSE | |
477 | int oldbytes = bytes; | |
478 | #endif | |
479 | bytes = frames * stride; | |
480 | snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", | |
481 | oldbytes, bytes); | |
482 | } | |
483 | /* update the current pointer */ | |
484 | spin_lock_irqsave(&subs->lock, flags); | |
485 | oldptr = subs->hwptr_done; | |
486 | subs->hwptr_done += bytes; | |
487 | if (subs->hwptr_done >= runtime->buffer_size * stride) | |
488 | subs->hwptr_done -= runtime->buffer_size * stride; | |
489 | frames = (bytes + (oldptr % stride)) / stride; | |
490 | subs->transfer_done += frames; | |
491 | if (subs->transfer_done >= runtime->period_size) { | |
492 | subs->transfer_done -= runtime->period_size; | |
493 | period_elapsed = 1; | |
494 | } | |
495 | spin_unlock_irqrestore(&subs->lock, flags); | |
496 | /* copy a data chunk */ | |
497 | if (oldptr + bytes > runtime->buffer_size * stride) { | |
498 | unsigned int bytes1 = | |
499 | runtime->buffer_size * stride - oldptr; | |
500 | memcpy(runtime->dma_area + oldptr, cp, bytes1); | |
501 | memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); | |
502 | } else { | |
503 | memcpy(runtime->dma_area + oldptr, cp, bytes); | |
504 | } | |
505 | } | |
506 | if (period_elapsed) | |
507 | snd_pcm_period_elapsed(subs->pcm_substream); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | /* | |
512 | * Process after capture complete when paused. Nothing to do. | |
513 | */ | |
514 | static int retire_paused_capture_urb(struct snd_usb_substream *subs, | |
515 | struct snd_pcm_runtime *runtime, | |
516 | struct urb *urb) | |
517 | { | |
518 | return 0; | |
519 | } | |
520 | ||
521 | ||
522 | /* | |
523 | * prepare urb for playback sync pipe | |
524 | * | |
525 | * set up the offset and length to receive the current frequency. | |
526 | */ | |
527 | static int prepare_playback_sync_urb(struct snd_usb_substream *subs, | |
528 | struct snd_pcm_runtime *runtime, | |
529 | struct urb *urb) | |
530 | { | |
531 | struct snd_urb_ctx *ctx = urb->context; | |
532 | ||
533 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
534 | urb->iso_frame_desc[0].length = min(4u, ctx->subs->syncmaxsize); | |
535 | urb->iso_frame_desc[0].offset = 0; | |
536 | return 0; | |
537 | } | |
538 | ||
539 | /* | |
540 | * process after playback sync complete | |
541 | * | |
542 | * Full speed devices report feedback values in 10.14 format as samples per | |
543 | * frame, high speed devices in 16.16 format as samples per microframe. | |
544 | * Because the Audio Class 1 spec was written before USB 2.0, many high speed | |
545 | * devices use a wrong interpretation, some others use an entirely different | |
546 | * format. Therefore, we cannot predict what format any particular device uses | |
547 | * and must detect it automatically. | |
548 | */ | |
549 | static int retire_playback_sync_urb(struct snd_usb_substream *subs, | |
550 | struct snd_pcm_runtime *runtime, | |
551 | struct urb *urb) | |
552 | { | |
553 | unsigned int f; | |
554 | int shift; | |
555 | unsigned long flags; | |
556 | ||
557 | if (urb->iso_frame_desc[0].status != 0 || | |
558 | urb->iso_frame_desc[0].actual_length < 3) | |
559 | return 0; | |
560 | ||
561 | f = le32_to_cpup(urb->transfer_buffer); | |
562 | if (urb->iso_frame_desc[0].actual_length == 3) | |
563 | f &= 0x00ffffff; | |
564 | else | |
565 | f &= 0x0fffffff; | |
566 | if (f == 0) | |
567 | return 0; | |
568 | ||
569 | if (unlikely(subs->freqshift == INT_MIN)) { | |
570 | /* | |
571 | * The first time we see a feedback value, determine its format | |
572 | * by shifting it left or right until it matches the nominal | |
573 | * frequency value. This assumes that the feedback does not | |
574 | * differ from the nominal value more than +50% or -25%. | |
575 | */ | |
576 | shift = 0; | |
577 | while (f < subs->freqn - subs->freqn / 4) { | |
578 | f <<= 1; | |
579 | shift++; | |
580 | } | |
581 | while (f > subs->freqn + subs->freqn / 2) { | |
582 | f >>= 1; | |
583 | shift--; | |
584 | } | |
585 | subs->freqshift = shift; | |
586 | } | |
587 | else if (subs->freqshift >= 0) | |
588 | f <<= subs->freqshift; | |
589 | else | |
590 | f >>= -subs->freqshift; | |
591 | ||
592 | if (likely(f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax)) { | |
593 | /* | |
594 | * If the frequency looks valid, set it. | |
595 | * This value is referred to in prepare_playback_urb(). | |
596 | */ | |
597 | spin_lock_irqsave(&subs->lock, flags); | |
598 | subs->freqm = f; | |
599 | spin_unlock_irqrestore(&subs->lock, flags); | |
600 | } else { | |
601 | /* | |
602 | * Out of range; maybe the shift value is wrong. | |
603 | * Reset it so that we autodetect again the next time. | |
604 | */ | |
605 | subs->freqshift = INT_MIN; | |
606 | } | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | /* determine the number of frames in the next packet */ | |
612 | static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs) | |
613 | { | |
614 | if (subs->fill_max) | |
615 | return subs->maxframesize; | |
616 | else { | |
617 | subs->phase = (subs->phase & 0xffff) | |
618 | + (subs->freqm << subs->datainterval); | |
619 | return min(subs->phase >> 16, subs->maxframesize); | |
620 | } | |
621 | } | |
622 | ||
623 | /* | |
624 | * Prepare urb for streaming before playback starts or when paused. | |
625 | * | |
626 | * We don't have any data, so we send silence. | |
627 | */ | |
628 | static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, | |
629 | struct snd_pcm_runtime *runtime, | |
630 | struct urb *urb) | |
631 | { | |
632 | unsigned int i, offs, counts; | |
633 | struct snd_urb_ctx *ctx = urb->context; | |
634 | int stride = runtime->frame_bits >> 3; | |
635 | ||
636 | offs = 0; | |
637 | urb->dev = ctx->subs->dev; | |
638 | for (i = 0; i < ctx->packets; ++i) { | |
639 | counts = snd_usb_audio_next_packet_size(subs); | |
640 | urb->iso_frame_desc[i].offset = offs * stride; | |
641 | urb->iso_frame_desc[i].length = counts * stride; | |
642 | offs += counts; | |
643 | } | |
644 | urb->number_of_packets = ctx->packets; | |
645 | urb->transfer_buffer_length = offs * stride; | |
646 | memset(urb->transfer_buffer, | |
647 | runtime->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, | |
648 | offs * stride); | |
649 | return 0; | |
650 | } | |
651 | ||
652 | /* | |
653 | * prepare urb for playback data pipe | |
654 | * | |
655 | * Since a URB can handle only a single linear buffer, we must use double | |
656 | * buffering when the data to be transferred overflows the buffer boundary. | |
657 | * To avoid inconsistencies when updating hwptr_done, we use double buffering | |
658 | * for all URBs. | |
659 | */ | |
660 | static int prepare_playback_urb(struct snd_usb_substream *subs, | |
661 | struct snd_pcm_runtime *runtime, | |
662 | struct urb *urb) | |
663 | { | |
664 | int i, stride; | |
665 | unsigned int counts, frames, bytes; | |
666 | unsigned long flags; | |
667 | int period_elapsed = 0; | |
668 | struct snd_urb_ctx *ctx = urb->context; | |
669 | ||
670 | stride = runtime->frame_bits >> 3; | |
671 | ||
672 | frames = 0; | |
673 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
674 | urb->number_of_packets = 0; | |
675 | spin_lock_irqsave(&subs->lock, flags); | |
676 | for (i = 0; i < ctx->packets; i++) { | |
677 | counts = snd_usb_audio_next_packet_size(subs); | |
678 | /* set up descriptor */ | |
679 | urb->iso_frame_desc[i].offset = frames * stride; | |
680 | urb->iso_frame_desc[i].length = counts * stride; | |
681 | frames += counts; | |
682 | urb->number_of_packets++; | |
683 | subs->transfer_done += counts; | |
684 | if (subs->transfer_done >= runtime->period_size) { | |
685 | subs->transfer_done -= runtime->period_size; | |
686 | period_elapsed = 1; | |
687 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) { | |
688 | if (subs->transfer_done > 0) { | |
689 | /* FIXME: fill-max mode is not | |
690 | * supported yet */ | |
691 | frames -= subs->transfer_done; | |
692 | counts -= subs->transfer_done; | |
693 | urb->iso_frame_desc[i].length = | |
694 | counts * stride; | |
695 | subs->transfer_done = 0; | |
696 | } | |
697 | i++; | |
698 | if (i < ctx->packets) { | |
699 | /* add a transfer delimiter */ | |
700 | urb->iso_frame_desc[i].offset = | |
701 | frames * stride; | |
702 | urb->iso_frame_desc[i].length = 0; | |
703 | urb->number_of_packets++; | |
704 | } | |
705 | break; | |
706 | } | |
707 | } | |
708 | if (period_elapsed) /* finish at the period boundary */ | |
709 | break; | |
710 | } | |
711 | bytes = frames * stride; | |
712 | if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { | |
713 | /* err, the transferred area goes over buffer boundary. */ | |
714 | unsigned int bytes1 = | |
715 | runtime->buffer_size * stride - subs->hwptr_done; | |
716 | memcpy(urb->transfer_buffer, | |
717 | runtime->dma_area + subs->hwptr_done, bytes1); | |
718 | memcpy(urb->transfer_buffer + bytes1, | |
719 | runtime->dma_area, bytes - bytes1); | |
720 | } else { | |
721 | memcpy(urb->transfer_buffer, | |
722 | runtime->dma_area + subs->hwptr_done, bytes); | |
723 | } | |
724 | subs->hwptr_done += bytes; | |
725 | if (subs->hwptr_done >= runtime->buffer_size * stride) | |
726 | subs->hwptr_done -= runtime->buffer_size * stride; | |
727 | ||
728 | /* update delay with exact number of samples queued */ | |
729 | runtime->delay = subs->last_delay; | |
730 | runtime->delay += frames; | |
731 | subs->last_delay = runtime->delay; | |
732 | ||
733 | /* realign last_frame_number */ | |
734 | subs->last_frame_number = usb_get_current_frame_number(subs->dev); | |
735 | subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ | |
736 | ||
737 | spin_unlock_irqrestore(&subs->lock, flags); | |
738 | urb->transfer_buffer_length = bytes; | |
739 | if (period_elapsed) | |
740 | snd_pcm_period_elapsed(subs->pcm_substream); | |
741 | return 0; | |
742 | } | |
743 | ||
744 | /* | |
745 | * process after playback data complete | |
746 | * - decrease the delay count again | |
747 | */ | |
748 | static int retire_playback_urb(struct snd_usb_substream *subs, | |
749 | struct snd_pcm_runtime *runtime, | |
750 | struct urb *urb) | |
751 | { | |
752 | unsigned long flags; | |
753 | int stride = runtime->frame_bits >> 3; | |
754 | int processed = urb->transfer_buffer_length / stride; | |
755 | int est_delay; | |
756 | ||
757 | spin_lock_irqsave(&subs->lock, flags); | |
758 | ||
759 | est_delay = snd_usb_pcm_delay(subs, runtime->rate); | |
760 | /* update delay with exact number of samples played */ | |
761 | if (processed > subs->last_delay) | |
762 | subs->last_delay = 0; | |
763 | else | |
764 | subs->last_delay -= processed; | |
765 | runtime->delay = subs->last_delay; | |
766 | ||
767 | /* | |
768 | * Report when delay estimate is off by more than 2ms. | |
769 | * The error should be lower than 2ms since the estimate relies | |
770 | * on two reads of a counter updated every ms. | |
771 | */ | |
772 | if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) | |
773 | snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", | |
774 | est_delay, subs->last_delay); | |
775 | ||
776 | spin_unlock_irqrestore(&subs->lock, flags); | |
777 | return 0; | |
778 | } | |
779 | ||
780 | static const char *usb_error_string(int err) | |
781 | { | |
782 | switch (err) { | |
783 | case -ENODEV: | |
784 | return "no device"; | |
785 | case -ENOENT: | |
786 | return "endpoint not enabled"; | |
787 | case -EPIPE: | |
788 | return "endpoint stalled"; | |
789 | case -ENOSPC: | |
790 | return "not enough bandwidth"; | |
791 | case -ESHUTDOWN: | |
792 | return "device disabled"; | |
793 | case -EHOSTUNREACH: | |
794 | return "device suspended"; | |
795 | case -EINVAL: | |
796 | case -EAGAIN: | |
797 | case -EFBIG: | |
798 | case -EMSGSIZE: | |
799 | return "internal error"; | |
800 | default: | |
801 | return "unknown error"; | |
802 | } | |
803 | } | |
804 | ||
805 | /* | |
806 | * set up and start data/sync urbs | |
807 | */ | |
808 | static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime) | |
809 | { | |
810 | unsigned int i; | |
811 | int err; | |
812 | ||
813 | if (subs->stream->chip->shutdown) | |
814 | return -EBADFD; | |
815 | ||
816 | for (i = 0; i < subs->nurbs; i++) { | |
817 | if (snd_BUG_ON(!subs->dataurb[i].urb)) | |
818 | return -EINVAL; | |
819 | if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) { | |
820 | snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i); | |
821 | goto __error; | |
822 | } | |
823 | } | |
824 | if (subs->syncpipe) { | |
825 | for (i = 0; i < SYNC_URBS; i++) { | |
826 | if (snd_BUG_ON(!subs->syncurb[i].urb)) | |
827 | return -EINVAL; | |
828 | if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) { | |
829 | snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i); | |
830 | goto __error; | |
831 | } | |
832 | } | |
833 | } | |
834 | ||
835 | subs->active_mask = 0; | |
836 | subs->unlink_mask = 0; | |
837 | subs->running = 1; | |
838 | for (i = 0; i < subs->nurbs; i++) { | |
839 | err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC); | |
840 | if (err < 0) { | |
841 | snd_printk(KERN_ERR "cannot submit datapipe " | |
842 | "for urb %d, error %d: %s\n", | |
843 | i, err, usb_error_string(err)); | |
844 | goto __error; | |
845 | } | |
846 | set_bit(i, &subs->active_mask); | |
847 | } | |
848 | if (subs->syncpipe) { | |
849 | for (i = 0; i < SYNC_URBS; i++) { | |
850 | err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC); | |
851 | if (err < 0) { | |
852 | snd_printk(KERN_ERR "cannot submit syncpipe " | |
853 | "for urb %d, error %d: %s\n", | |
854 | i, err, usb_error_string(err)); | |
855 | goto __error; | |
856 | } | |
857 | set_bit(i + 16, &subs->active_mask); | |
858 | } | |
859 | } | |
860 | return 0; | |
861 | ||
862 | __error: | |
863 | // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN); | |
8fdff6a3 | 864 | deactivate_urbs_old(subs, 0, 0); |
c731bc96 DM |
865 | return -EPIPE; |
866 | } | |
867 | ||
868 | ||
869 | /* | |
870 | */ | |
871 | static struct snd_urb_ops audio_urb_ops[2] = { | |
872 | { | |
873 | .prepare = prepare_nodata_playback_urb, | |
874 | .retire = retire_playback_urb, | |
875 | .prepare_sync = prepare_playback_sync_urb, | |
876 | .retire_sync = retire_playback_sync_urb, | |
877 | }, | |
878 | { | |
879 | .prepare = prepare_capture_urb, | |
880 | .retire = retire_capture_urb, | |
881 | .prepare_sync = prepare_capture_sync_urb, | |
882 | .retire_sync = retire_capture_sync_urb, | |
883 | }, | |
884 | }; | |
885 | ||
886 | /* | |
887 | * initialize the substream instance. | |
888 | */ | |
889 | ||
890 | void snd_usb_init_substream(struct snd_usb_stream *as, | |
891 | int stream, struct audioformat *fp) | |
892 | { | |
893 | struct snd_usb_substream *subs = &as->substream[stream]; | |
894 | ||
895 | INIT_LIST_HEAD(&subs->fmt_list); | |
896 | spin_lock_init(&subs->lock); | |
897 | ||
898 | subs->stream = as; | |
899 | subs->direction = stream; | |
900 | subs->dev = as->chip->dev; | |
901 | subs->txfr_quirk = as->chip->txfr_quirk; | |
902 | subs->ops = audio_urb_ops[stream]; | |
903 | if (snd_usb_get_speed(subs->dev) >= USB_SPEED_HIGH) | |
904 | subs->ops.prepare_sync = prepare_capture_sync_urb_hs; | |
905 | ||
906 | snd_usb_set_pcm_ops(as->pcm, stream); | |
907 | ||
908 | list_add_tail(&fp->list, &subs->fmt_list); | |
909 | subs->formats |= fp->formats; | |
910 | subs->endpoint = fp->endpoint; | |
911 | subs->num_formats++; | |
912 | subs->fmt_type = fp->fmt_type; | |
913 | } | |
914 | ||
c731bc96 DM |
915 | int snd_usb_substream_prepare(struct snd_usb_substream *subs, |
916 | struct snd_pcm_runtime *runtime) | |
917 | { | |
918 | /* clear urbs (to be sure) */ | |
8fdff6a3 DM |
919 | deactivate_urbs_old(subs, 0, 1); |
920 | wait_clear_urbs_old(subs); | |
c731bc96 DM |
921 | |
922 | /* for playback, submit the URBs now; otherwise, the first hwptr_done | |
923 | * updates for all URBs would happen at the same time when starting */ | |
924 | if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { | |
925 | subs->ops.prepare = prepare_nodata_playback_urb; | |
926 | return start_urbs(subs, runtime); | |
927 | } | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
8fdff6a3 DM |
932 | int snd_usb_endpoint_implict_feedback_sink(struct snd_usb_endpoint *ep) |
933 | { | |
934 | return ep->sync_master && | |
935 | ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA && | |
936 | ep->type == SND_USB_ENDPOINT_TYPE_DATA && | |
937 | usb_pipeout(ep->pipe); | |
938 | } | |
939 | ||
940 | /* determine the number of frames in the next packet */ | |
941 | static int next_packet_size(struct snd_usb_endpoint *ep) | |
942 | { | |
943 | unsigned long flags; | |
944 | int ret; | |
945 | ||
946 | if (ep->fill_max) | |
947 | return ep->maxframesize; | |
948 | ||
949 | spin_lock_irqsave(&ep->lock, flags); | |
950 | ep->phase = (ep->phase & 0xffff) | |
951 | + (ep->freqm << ep->datainterval); | |
952 | ret = min(ep->phase >> 16, ep->maxframesize); | |
953 | spin_unlock_irqrestore(&ep->lock, flags); | |
954 | ||
955 | return ret; | |
956 | } | |
957 | ||
958 | static void retire_outbound_urb(struct snd_usb_endpoint *ep, | |
959 | struct snd_urb_ctx *urb_ctx) | |
960 | { | |
961 | if (ep->retire_data_urb) | |
962 | ep->retire_data_urb(ep->data_subs, urb_ctx->urb); | |
963 | } | |
964 | ||
965 | static void retire_inbound_urb(struct snd_usb_endpoint *ep, | |
966 | struct snd_urb_ctx *urb_ctx) | |
967 | { | |
968 | struct urb *urb = urb_ctx->urb; | |
969 | ||
970 | if (ep->sync_slave) | |
971 | snd_usb_handle_sync_urb(ep->sync_slave, ep, urb); | |
972 | ||
973 | if (ep->retire_data_urb) | |
974 | ep->retire_data_urb(ep->data_subs, urb); | |
975 | } | |
976 | ||
977 | static void prepare_outbound_urb_sizes(struct snd_usb_endpoint *ep, | |
978 | struct snd_urb_ctx *ctx) | |
979 | { | |
980 | int i; | |
981 | ||
982 | for (i = 0; i < ctx->packets; ++i) | |
983 | ctx->packet_size[i] = next_packet_size(ep); | |
984 | } | |
985 | ||
986 | /* | |
987 | * Prepare a PLAYBACK urb for submission to the bus. | |
988 | */ | |
989 | static void prepare_outbound_urb(struct snd_usb_endpoint *ep, | |
990 | struct snd_urb_ctx *ctx) | |
991 | { | |
992 | int i; | |
993 | struct urb *urb = ctx->urb; | |
994 | unsigned char *cp = urb->transfer_buffer; | |
995 | ||
996 | urb->dev = ep->chip->dev; /* we need to set this at each time */ | |
997 | ||
998 | switch (ep->type) { | |
999 | case SND_USB_ENDPOINT_TYPE_DATA: | |
1000 | if (ep->prepare_data_urb) { | |
1001 | ep->prepare_data_urb(ep->data_subs, urb); | |
1002 | } else { | |
1003 | /* no data provider, so send silence */ | |
1004 | unsigned int offs = 0; | |
1005 | for (i = 0; i < ctx->packets; ++i) { | |
1006 | int counts = ctx->packet_size[i]; | |
1007 | urb->iso_frame_desc[i].offset = offs * ep->stride; | |
1008 | urb->iso_frame_desc[i].length = counts * ep->stride; | |
1009 | offs += counts; | |
1010 | } | |
1011 | ||
1012 | urb->number_of_packets = ctx->packets; | |
1013 | urb->transfer_buffer_length = offs * ep->stride; | |
1014 | memset(urb->transfer_buffer, ep->silence_value, | |
1015 | offs * ep->stride); | |
1016 | } | |
1017 | break; | |
1018 | ||
1019 | case SND_USB_ENDPOINT_TYPE_SYNC: | |
1020 | if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) { | |
1021 | /* | |
1022 | * fill the length and offset of each urb descriptor. | |
1023 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. | |
1024 | */ | |
1025 | urb->iso_frame_desc[0].length = 4; | |
1026 | urb->iso_frame_desc[0].offset = 0; | |
1027 | cp[0] = ep->freqn; | |
1028 | cp[1] = ep->freqn >> 8; | |
1029 | cp[2] = ep->freqn >> 16; | |
1030 | cp[3] = ep->freqn >> 24; | |
1031 | } else { | |
1032 | /* | |
1033 | * fill the length and offset of each urb descriptor. | |
1034 | * the fixed 10.14 frequency is passed through the pipe. | |
1035 | */ | |
1036 | urb->iso_frame_desc[0].length = 3; | |
1037 | urb->iso_frame_desc[0].offset = 0; | |
1038 | cp[0] = ep->freqn >> 2; | |
1039 | cp[1] = ep->freqn >> 10; | |
1040 | cp[2] = ep->freqn >> 18; | |
1041 | } | |
1042 | ||
1043 | break; | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Prepare a CAPTURE or SYNC urb for submission to the bus. | |
1049 | */ | |
1050 | static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep, | |
1051 | struct snd_urb_ctx *urb_ctx) | |
1052 | { | |
1053 | int i, offs; | |
1054 | struct urb *urb = urb_ctx->urb; | |
1055 | ||
1056 | urb->dev = ep->chip->dev; /* we need to set this at each time */ | |
1057 | ||
1058 | switch (ep->type) { | |
1059 | case SND_USB_ENDPOINT_TYPE_DATA: | |
1060 | offs = 0; | |
1061 | for (i = 0; i < urb_ctx->packets; i++) { | |
1062 | urb->iso_frame_desc[i].offset = offs; | |
1063 | urb->iso_frame_desc[i].length = ep->curpacksize; | |
1064 | offs += ep->curpacksize; | |
1065 | } | |
1066 | ||
1067 | urb->transfer_buffer_length = offs; | |
1068 | urb->number_of_packets = urb_ctx->packets; | |
1069 | break; | |
1070 | ||
1071 | case SND_USB_ENDPOINT_TYPE_SYNC: | |
1072 | urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize); | |
1073 | urb->iso_frame_desc[0].offset = 0; | |
1074 | break; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | static void queue_pending_output_urbs(struct snd_usb_endpoint *ep) | |
1079 | { | |
1080 | while (test_bit(EP_FLAG_RUNNING, &ep->flags)) { | |
1081 | ||
1082 | unsigned long flags; | |
1083 | struct snd_usb_packet_info *packet; | |
1084 | struct snd_urb_ctx *ctx = NULL; | |
1085 | struct urb *urb; | |
1086 | int err, i; | |
1087 | ||
1088 | spin_lock_irqsave(&ep->lock, flags); | |
1089 | if (ep->next_packet_read_pos != ep->next_packet_write_pos) { | |
1090 | packet = ep->next_packet + ep->next_packet_read_pos; | |
1091 | ep->next_packet_read_pos++; | |
1092 | ep->next_packet_read_pos %= MAX_URBS; | |
1093 | ||
1094 | /* take URB out of FIFO */ | |
1095 | if (!list_empty(&ep->ready_playback_urbs)) | |
1096 | ctx = list_first_entry(&ep->ready_playback_urbs, | |
1097 | struct snd_urb_ctx, ready_list); | |
1098 | } | |
1099 | spin_unlock_irqrestore(&ep->lock, flags); | |
1100 | ||
1101 | if (ctx == NULL) | |
1102 | return; | |
1103 | ||
1104 | list_del_init(&ctx->ready_list); | |
1105 | urb = ctx->urb; | |
1106 | ||
1107 | /* copy over the length information */ | |
1108 | for (i = 0; i < packet->packets; i++) | |
1109 | ctx->packet_size[i] = packet->packet_size[i]; | |
1110 | ||
1111 | prepare_outbound_urb(ep, ctx); | |
1112 | ||
1113 | err = usb_submit_urb(ctx->urb, GFP_ATOMIC); | |
1114 | if (err < 0) | |
1115 | snd_printk(KERN_ERR "Unable to submit urb #%d: %d (urb %p)\n", | |
1116 | ctx->index, err, ctx->urb); | |
1117 | else | |
1118 | set_bit(ctx->index, &ep->active_mask); | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * complete callback for urbs | |
1124 | */ | |
1125 | static void snd_complete_urb(struct urb *urb) | |
1126 | { | |
1127 | struct snd_urb_ctx *ctx = urb->context; | |
1128 | struct snd_usb_endpoint *ep = ctx->ep; | |
1129 | int err; | |
1130 | ||
1131 | if (unlikely(urb->status == -ENOENT || /* unlinked */ | |
1132 | urb->status == -ENODEV || /* device removed */ | |
1133 | urb->status == -ECONNRESET || /* unlinked */ | |
1134 | urb->status == -ESHUTDOWN || /* device disabled */ | |
1135 | ep->chip->shutdown)) /* device disconnected */ | |
1136 | goto exit_clear; | |
1137 | ||
1138 | if (usb_pipeout(ep->pipe)) { | |
1139 | retire_outbound_urb(ep, ctx); | |
1140 | /* can be stopped during retire callback */ | |
1141 | if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) | |
1142 | goto exit_clear; | |
1143 | ||
1144 | if (snd_usb_endpoint_implict_feedback_sink(ep)) { | |
1145 | unsigned long flags; | |
1146 | ||
1147 | spin_lock_irqsave(&ep->lock, flags); | |
1148 | list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); | |
1149 | spin_unlock_irqrestore(&ep->lock, flags); | |
1150 | queue_pending_output_urbs(ep); | |
1151 | ||
1152 | goto exit_clear; | |
1153 | } | |
1154 | ||
1155 | prepare_outbound_urb_sizes(ep, ctx); | |
1156 | prepare_outbound_urb(ep, ctx); | |
1157 | } else { | |
1158 | retire_inbound_urb(ep, ctx); | |
1159 | /* can be stopped during retire callback */ | |
1160 | if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) | |
1161 | goto exit_clear; | |
1162 | ||
1163 | prepare_inbound_urb(ep, ctx); | |
1164 | } | |
1165 | ||
1166 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
1167 | if (err == 0) | |
1168 | return; | |
1169 | ||
1170 | snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err); | |
1171 | //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
1172 | ||
1173 | exit_clear: | |
1174 | clear_bit(ctx->index, &ep->active_mask); | |
1175 | } | |
1176 | ||
1177 | struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, | |
1178 | struct usb_host_interface *alts, | |
1179 | int ep_num, int direction, int type) | |
1180 | { | |
1181 | struct list_head *p; | |
1182 | struct snd_usb_endpoint *ep; | |
1183 | int ret, is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK; | |
1184 | ||
1185 | mutex_lock(&chip->mutex); | |
1186 | ||
1187 | list_for_each(p, &chip->ep_list) { | |
1188 | ep = list_entry(p, struct snd_usb_endpoint, list); | |
1189 | if (ep->ep_num == ep_num && | |
1190 | ep->iface == alts->desc.bInterfaceNumber && | |
1191 | ep->alt_idx == alts->desc.bAlternateSetting) { | |
1192 | snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n", | |
1193 | ep_num, ep->iface, ep->alt_idx, ep); | |
1194 | goto __exit_unlock; | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | snd_printdd(KERN_DEBUG "Creating new %s %s endpoint #%x\n", | |
1199 | is_playback ? "playback" : "capture", | |
1200 | type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync", | |
1201 | ep_num); | |
1202 | ||
1203 | /* select the alt setting once so the endpoints become valid */ | |
1204 | ret = usb_set_interface(chip->dev, alts->desc.bInterfaceNumber, | |
1205 | alts->desc.bAlternateSetting); | |
1206 | if (ret < 0) { | |
1207 | snd_printk(KERN_ERR "%s(): usb_set_interface() failed, ret = %d\n", | |
1208 | __func__, ret); | |
1209 | ep = NULL; | |
1210 | goto __exit_unlock; | |
1211 | } | |
1212 | ||
1213 | ep = kzalloc(sizeof(*ep), GFP_KERNEL); | |
1214 | if (!ep) | |
1215 | goto __exit_unlock; | |
1216 | ||
1217 | ep->chip = chip; | |
1218 | spin_lock_init(&ep->lock); | |
1219 | ep->type = type; | |
1220 | ep->ep_num = ep_num; | |
1221 | ep->iface = alts->desc.bInterfaceNumber; | |
1222 | ep->alt_idx = alts->desc.bAlternateSetting; | |
1223 | INIT_LIST_HEAD(&ep->ready_playback_urbs); | |
1224 | ep_num &= USB_ENDPOINT_NUMBER_MASK; | |
1225 | ||
1226 | if (is_playback) | |
1227 | ep->pipe = usb_sndisocpipe(chip->dev, ep_num); | |
1228 | else | |
1229 | ep->pipe = usb_rcvisocpipe(chip->dev, ep_num); | |
1230 | ||
1231 | if (type == SND_USB_ENDPOINT_TYPE_SYNC) { | |
1232 | if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && | |
1233 | get_endpoint(alts, 1)->bRefresh >= 1 && | |
1234 | get_endpoint(alts, 1)->bRefresh <= 9) | |
1235 | ep->syncinterval = get_endpoint(alts, 1)->bRefresh; | |
1236 | else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) | |
1237 | ep->syncinterval = 1; | |
1238 | else if (get_endpoint(alts, 1)->bInterval >= 1 && | |
1239 | get_endpoint(alts, 1)->bInterval <= 16) | |
1240 | ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1; | |
1241 | else | |
1242 | ep->syncinterval = 3; | |
1243 | ||
1244 | ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize); | |
1245 | } | |
1246 | ||
1247 | list_add_tail(&ep->list, &chip->ep_list); | |
1248 | ||
1249 | __exit_unlock: | |
1250 | mutex_unlock(&chip->mutex); | |
1251 | ||
1252 | return ep; | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * wait until all urbs are processed. | |
1257 | */ | |
1258 | static int wait_clear_urbs(struct snd_usb_endpoint *ep) | |
1259 | { | |
1260 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); | |
1261 | unsigned int i; | |
1262 | int alive; | |
1263 | ||
1264 | do { | |
1265 | alive = 0; | |
1266 | for (i = 0; i < ep->nurbs; i++) | |
1267 | if (test_bit(i, &ep->active_mask)) | |
1268 | alive++; | |
1269 | ||
1270 | if (!alive) | |
1271 | break; | |
1272 | ||
1273 | schedule_timeout_uninterruptible(1); | |
1274 | } while (time_before(jiffies, end_time)); | |
1275 | ||
1276 | if (alive) | |
1277 | snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n", | |
1278 | alive, ep->ep_num); | |
1279 | ||
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * unlink active urbs. | |
1285 | */ | |
1286 | static int deactivate_urbs(struct snd_usb_endpoint *ep, int force, int can_sleep) | |
1287 | { | |
1288 | unsigned long flags; | |
1289 | unsigned int i; | |
1290 | int async; | |
1291 | ||
1292 | if (!force && ep->chip->shutdown) /* to be sure... */ | |
1293 | return -EBADFD; | |
1294 | ||
1295 | async = !can_sleep && ep->chip->async_unlink; | |
1296 | ||
1297 | clear_bit(EP_FLAG_RUNNING, &ep->flags); | |
1298 | ||
1299 | INIT_LIST_HEAD(&ep->ready_playback_urbs); | |
1300 | ep->next_packet_read_pos = 0; | |
1301 | ep->next_packet_write_pos = 0; | |
1302 | ||
1303 | if (!async && in_interrupt()) | |
1304 | return 0; | |
1305 | ||
1306 | for (i = 0; i < ep->nurbs; i++) { | |
1307 | if (test_bit(i, &ep->active_mask)) { | |
1308 | if (!test_and_set_bit(i, &ep->unlink_mask)) { | |
1309 | struct urb *u = ep->urb[i].urb; | |
1310 | if (async) | |
1311 | usb_unlink_urb(u); | |
1312 | else | |
1313 | usb_kill_urb(u); | |
1314 | } | |
1315 | } | |
1316 | } | |
1317 | ||
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * release an endpoint's urbs | |
1323 | */ | |
1324 | static void release_urbs(struct snd_usb_endpoint *ep, int force) | |
1325 | { | |
1326 | int i; | |
1327 | ||
1328 | /* route incoming urbs to nirvana */ | |
1329 | ep->retire_data_urb = NULL; | |
1330 | ep->prepare_data_urb = NULL; | |
1331 | ||
1332 | /* stop urbs */ | |
1333 | deactivate_urbs(ep, force, 1); | |
1334 | wait_clear_urbs(ep); | |
1335 | ||
1336 | for (i = 0; i < ep->nurbs; i++) | |
1337 | release_urb_ctx(&ep->urb[i]); | |
1338 | ||
1339 | if (ep->syncbuf) | |
1340 | usb_free_coherent(ep->chip->dev, SYNC_URBS * 4, | |
1341 | ep->syncbuf, ep->sync_dma); | |
1342 | ||
1343 | ep->syncbuf = NULL; | |
1344 | ep->nurbs = 0; | |
1345 | } | |
1346 | ||
1347 | static int data_ep_set_params(struct snd_usb_endpoint *ep, | |
1348 | struct snd_pcm_hw_params *hw_params, | |
1349 | struct audioformat *fmt, | |
1350 | struct snd_usb_endpoint *sync_ep) | |
1351 | { | |
1352 | unsigned int maxsize, i, urb_packs, total_packs, packs_per_ms; | |
1353 | int period_bytes = params_period_bytes(hw_params); | |
1354 | int format = params_format(hw_params); | |
1355 | int is_playback = usb_pipeout(ep->pipe); | |
1356 | int frame_bits = snd_pcm_format_physical_width(params_format(hw_params)) * | |
1357 | params_channels(hw_params); | |
1358 | ||
1359 | ep->datainterval = fmt->datainterval; | |
1360 | ep->stride = frame_bits >> 3; | |
1361 | ep->silence_value = format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0; | |
1362 | ||
1363 | /* calculate max. frequency */ | |
1364 | if (ep->maxpacksize) { | |
1365 | /* whatever fits into a max. size packet */ | |
1366 | maxsize = ep->maxpacksize; | |
1367 | ep->freqmax = (maxsize / (frame_bits >> 3)) | |
1368 | << (16 - ep->datainterval); | |
1369 | } else { | |
1370 | /* no max. packet size: just take 25% higher than nominal */ | |
1371 | ep->freqmax = ep->freqn + (ep->freqn >> 2); | |
1372 | maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3)) | |
1373 | >> (16 - ep->datainterval); | |
1374 | } | |
1375 | ||
1376 | if (ep->fill_max) | |
1377 | ep->curpacksize = ep->maxpacksize; | |
1378 | else | |
1379 | ep->curpacksize = maxsize; | |
1380 | ||
1381 | if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) | |
1382 | packs_per_ms = 8 >> ep->datainterval; | |
1383 | else | |
1384 | packs_per_ms = 1; | |
1385 | ||
1386 | if (is_playback && !snd_usb_endpoint_implict_feedback_sink(ep)) { | |
1387 | urb_packs = max(ep->chip->nrpacks, 1); | |
1388 | urb_packs = min(urb_packs, (unsigned int) MAX_PACKS); | |
1389 | } else { | |
1390 | urb_packs = 1; | |
1391 | } | |
1392 | ||
1393 | urb_packs *= packs_per_ms; | |
1394 | ||
1395 | if (sync_ep && !snd_usb_endpoint_implict_feedback_sink(ep)) | |
1396 | urb_packs = min(urb_packs, 1U << sync_ep->syncinterval); | |
1397 | ||
1398 | /* decide how many packets to be used */ | |
1399 | if (is_playback && !snd_usb_endpoint_implict_feedback_sink(ep)) { | |
1400 | unsigned int minsize, maxpacks; | |
1401 | /* determine how small a packet can be */ | |
1402 | minsize = (ep->freqn >> (16 - ep->datainterval)) | |
1403 | * (frame_bits >> 3); | |
1404 | /* with sync from device, assume it can be 12% lower */ | |
1405 | if (sync_ep) | |
1406 | minsize -= minsize >> 3; | |
1407 | minsize = max(minsize, 1u); | |
1408 | total_packs = (period_bytes + minsize - 1) / minsize; | |
1409 | /* we need at least two URBs for queueing */ | |
1410 | if (total_packs < 2) { | |
1411 | total_packs = 2; | |
1412 | } else { | |
1413 | /* and we don't want too long a queue either */ | |
1414 | maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); | |
1415 | total_packs = min(total_packs, maxpacks); | |
1416 | } | |
1417 | } else { | |
1418 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) | |
1419 | urb_packs >>= 1; | |
1420 | total_packs = MAX_URBS * urb_packs; | |
1421 | } | |
1422 | ||
1423 | ep->nurbs = (total_packs + urb_packs - 1) / urb_packs; | |
1424 | if (ep->nurbs > MAX_URBS) { | |
1425 | /* too much... */ | |
1426 | ep->nurbs = MAX_URBS; | |
1427 | total_packs = MAX_URBS * urb_packs; | |
1428 | } else if (ep->nurbs < 2) { | |
1429 | /* too little - we need at least two packets | |
1430 | * to ensure contiguous playback/capture | |
1431 | */ | |
1432 | ep->nurbs = 2; | |
1433 | } | |
1434 | ||
1435 | /* allocate and initialize data urbs */ | |
1436 | for (i = 0; i < ep->nurbs; i++) { | |
1437 | struct snd_urb_ctx *u = &ep->urb[i]; | |
1438 | u->index = i; | |
1439 | u->ep = ep; | |
1440 | u->packets = (i + 1) * total_packs / ep->nurbs | |
1441 | - i * total_packs / ep->nurbs; | |
1442 | u->buffer_size = maxsize * u->packets; | |
1443 | ||
1444 | if (fmt->fmt_type == UAC_FORMAT_TYPE_II) | |
1445 | u->packets++; /* for transfer delimiter */ | |
1446 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); | |
1447 | if (!u->urb) | |
1448 | goto out_of_memory; | |
1449 | ||
1450 | u->urb->transfer_buffer = | |
1451 | usb_alloc_coherent(ep->chip->dev, u->buffer_size, | |
1452 | GFP_KERNEL, &u->urb->transfer_dma); | |
1453 | if (!u->urb->transfer_buffer) | |
1454 | goto out_of_memory; | |
1455 | u->urb->pipe = ep->pipe; | |
1456 | u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
1457 | u->urb->interval = 1 << ep->datainterval; | |
1458 | u->urb->context = u; | |
1459 | u->urb->complete = snd_complete_urb; | |
1460 | INIT_LIST_HEAD(&u->ready_list); | |
1461 | } | |
1462 | ||
1463 | return 0; | |
1464 | ||
1465 | out_of_memory: | |
1466 | release_urbs(ep, 0); | |
1467 | return -ENOMEM; | |
1468 | } | |
1469 | ||
1470 | static int sync_ep_set_params(struct snd_usb_endpoint *ep, | |
1471 | struct snd_pcm_hw_params *hw_params, | |
1472 | struct audioformat *fmt) | |
1473 | { | |
1474 | int i; | |
1475 | ||
1476 | ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4, | |
1477 | GFP_KERNEL, &ep->sync_dma); | |
1478 | if (!ep->syncbuf) | |
1479 | return -ENOMEM; | |
1480 | ||
1481 | for (i = 0; i < SYNC_URBS; i++) { | |
1482 | struct snd_urb_ctx *u = &ep->urb[i]; | |
1483 | u->index = i; | |
1484 | u->ep = ep; | |
1485 | u->packets = 1; | |
1486 | u->urb = usb_alloc_urb(1, GFP_KERNEL); | |
1487 | if (!u->urb) | |
1488 | goto out_of_memory; | |
1489 | u->urb->transfer_buffer = ep->syncbuf + i * 4; | |
1490 | u->urb->transfer_dma = ep->sync_dma + i * 4; | |
1491 | u->urb->transfer_buffer_length = 4; | |
1492 | u->urb->pipe = ep->pipe; | |
1493 | u->urb->transfer_flags = URB_ISO_ASAP | | |
1494 | URB_NO_TRANSFER_DMA_MAP; | |
1495 | u->urb->number_of_packets = 1; | |
1496 | u->urb->interval = 1 << ep->syncinterval; | |
1497 | u->urb->context = u; | |
1498 | u->urb->complete = snd_complete_urb; | |
1499 | } | |
1500 | ||
1501 | ep->nurbs = SYNC_URBS; | |
1502 | ||
1503 | return 0; | |
1504 | ||
1505 | out_of_memory: | |
1506 | release_urbs(ep, 0); | |
1507 | return -ENOMEM; | |
1508 | } | |
1509 | ||
1510 | int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, | |
1511 | struct snd_pcm_hw_params *hw_params, | |
1512 | struct audioformat *fmt, | |
1513 | struct snd_usb_endpoint *sync_ep) | |
1514 | { | |
1515 | int err; | |
1516 | ||
1517 | if (ep->use_count != 0) { | |
1518 | snd_printk(KERN_WARNING "Unable to change format on ep #%x: already in use\n", | |
1519 | ep->ep_num); | |
1520 | return -EBUSY; | |
1521 | } | |
1522 | ||
1523 | /* release old buffers, if any */ | |
1524 | release_urbs(ep, 0); | |
1525 | ||
1526 | ep->datainterval = fmt->datainterval; | |
1527 | ep->maxpacksize = fmt->maxpacksize; | |
1528 | ep->fill_max = fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX; | |
1529 | ||
1530 | if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) | |
1531 | ep->freqn = get_usb_full_speed_rate(params_rate(hw_params)); | |
1532 | else | |
1533 | ep->freqn = get_usb_high_speed_rate(params_rate(hw_params)); | |
1534 | ||
1535 | /* calculate the frequency in 16.16 format */ | |
1536 | ep->freqm = ep->freqn; | |
1537 | ep->freqshift = INT_MIN; | |
1538 | ||
1539 | ep->phase = 0; | |
1540 | ||
1541 | switch (ep->type) { | |
1542 | case SND_USB_ENDPOINT_TYPE_DATA: | |
1543 | err = data_ep_set_params(ep, hw_params, fmt, sync_ep); | |
1544 | break; | |
1545 | case SND_USB_ENDPOINT_TYPE_SYNC: | |
1546 | err = sync_ep_set_params(ep, hw_params, fmt); | |
1547 | break; | |
1548 | default: | |
1549 | err = -EINVAL; | |
1550 | } | |
1551 | ||
1552 | snd_printdd(KERN_DEBUG "Setting params for ep #%x (type %d, %d urbs), ret=%d\n", | |
1553 | ep->ep_num, ep->type, ep->nurbs, err); | |
1554 | ||
1555 | return err; | |
1556 | } | |
1557 | ||
1558 | int snd_usb_endpoint_start(struct snd_usb_endpoint *ep) | |
1559 | { | |
1560 | int err; | |
1561 | unsigned int i; | |
1562 | ||
1563 | if (ep->chip->shutdown) | |
1564 | return -EBADFD; | |
1565 | ||
1566 | /* already running? */ | |
1567 | if (++ep->use_count != 1) | |
1568 | return 0; | |
1569 | ||
1570 | if (snd_BUG_ON(!test_bit(EP_FLAG_ACTIVATED, &ep->flags))) | |
1571 | return -EINVAL; | |
1572 | ||
1573 | /* just to be sure */ | |
1574 | deactivate_urbs(ep, 0, 1); | |
1575 | wait_clear_urbs(ep); | |
1576 | ||
1577 | ep->active_mask = 0; | |
1578 | ep->unlink_mask = 0; | |
1579 | ep->phase = 0; | |
1580 | ||
1581 | /* | |
1582 | * If this endpoint has a data endpoint as implicit feedback source, | |
1583 | * don't start the urbs here. Instead, mark them all as available, | |
1584 | * wait for the record urbs to arrive and queue from that context. | |
1585 | */ | |
1586 | ||
1587 | set_bit(EP_FLAG_RUNNING, &ep->flags); | |
1588 | ||
1589 | if (snd_usb_endpoint_implict_feedback_sink(ep)) { | |
1590 | for (i = 0; i < ep->nurbs; i++) { | |
1591 | struct snd_urb_ctx *ctx = ep->urb + i; | |
1592 | list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); | |
1593 | } | |
1594 | ||
1595 | return 0; | |
1596 | } | |
1597 | ||
1598 | for (i = 0; i < ep->nurbs; i++) { | |
1599 | struct urb *urb = ep->urb[i].urb; | |
1600 | ||
1601 | if (snd_BUG_ON(!urb)) | |
1602 | goto __error; | |
1603 | ||
1604 | if (usb_pipeout(ep->pipe)) { | |
1605 | prepare_outbound_urb_sizes(ep, urb->context); | |
1606 | prepare_outbound_urb(ep, urb->context); | |
1607 | } else { | |
1608 | prepare_inbound_urb(ep, urb->context); | |
1609 | } | |
1610 | ||
1611 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
1612 | if (err < 0) { | |
1613 | snd_printk(KERN_ERR "cannot submit urb %d, error %d: %s\n", | |
1614 | i, err, usb_error_string(err)); | |
1615 | goto __error; | |
1616 | } | |
1617 | set_bit(i, &ep->active_mask); | |
1618 | } | |
1619 | ||
1620 | return 0; | |
1621 | ||
1622 | __error: | |
1623 | clear_bit(EP_FLAG_RUNNING, &ep->flags); | |
1624 | ep->use_count--; | |
1625 | deactivate_urbs(ep, 0, 0); | |
1626 | return -EPIPE; | |
1627 | } | |
1628 | ||
1629 | void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, | |
1630 | int force, int can_sleep, int wait) | |
1631 | { | |
1632 | if (!ep) | |
1633 | return; | |
1634 | ||
1635 | if (snd_BUG_ON(ep->use_count == 0)) | |
1636 | return; | |
1637 | ||
1638 | if (snd_BUG_ON(!test_bit(EP_FLAG_ACTIVATED, &ep->flags))) | |
1639 | return; | |
1640 | ||
1641 | if (--ep->use_count == 0) { | |
1642 | deactivate_urbs(ep, force, can_sleep); | |
1643 | ep->data_subs = NULL; | |
1644 | ep->sync_slave = NULL; | |
1645 | ep->retire_data_urb = NULL; | |
1646 | ep->prepare_data_urb = NULL; | |
1647 | ||
1648 | if (wait) | |
1649 | wait_clear_urbs(ep); | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | int snd_usb_endpoint_activate(struct snd_usb_endpoint *ep) | |
1654 | { | |
1655 | if (ep->use_count != 0) | |
1656 | return 0; | |
1657 | ||
1658 | if (!ep->chip->shutdown && | |
1659 | !test_and_set_bit(EP_FLAG_ACTIVATED, &ep->flags)) { | |
1660 | int ret; | |
1661 | ||
1662 | ret = usb_set_interface(ep->chip->dev, ep->iface, ep->alt_idx); | |
1663 | if (ret < 0) { | |
1664 | snd_printk(KERN_ERR "%s() usb_set_interface() failed, ret = %d\n", | |
1665 | __func__, ret); | |
1666 | clear_bit(EP_FLAG_ACTIVATED, &ep->flags); | |
1667 | return ret; | |
1668 | } | |
1669 | ||
1670 | return 0; | |
1671 | } | |
1672 | ||
1673 | return -EBUSY; | |
1674 | } | |
1675 | ||
1676 | int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep) | |
1677 | { | |
1678 | if (!ep) | |
1679 | return -EINVAL; | |
1680 | ||
1681 | if (ep->use_count != 0) | |
1682 | return 0; | |
1683 | ||
1684 | if (!ep->chip->shutdown && | |
1685 | test_and_clear_bit(EP_FLAG_ACTIVATED, &ep->flags)) { | |
1686 | int ret; | |
1687 | ||
1688 | ret = usb_set_interface(ep->chip->dev, ep->iface, 0); | |
1689 | if (ret < 0) { | |
1690 | snd_printk(KERN_ERR "%s(): usb_set_interface() failed, ret = %d\n", | |
1691 | __func__, ret); | |
1692 | return ret; | |
1693 | } | |
1694 | ||
1695 | return 0; | |
1696 | } | |
1697 | ||
1698 | return -EBUSY; | |
1699 | } | |
1700 | ||
1701 | void snd_usb_endpoint_free(struct list_head *head) | |
1702 | { | |
1703 | struct snd_usb_endpoint *ep; | |
1704 | ||
1705 | ep = list_entry(head, struct snd_usb_endpoint, list); | |
1706 | release_urbs(ep, 1); | |
1707 | kfree(ep); | |
1708 | } | |
1709 | ||
1710 | /* | |
1711 | * process after playback sync complete | |
1712 | * | |
1713 | * Full speed devices report feedback values in 10.14 format as samples per | |
1714 | * frame, high speed devices in 16.16 format as samples per microframe. | |
1715 | * Because the Audio Class 1 spec was written before USB 2.0, many high speed | |
1716 | * devices use a wrong interpretation, some others use an entirely different | |
1717 | * format. Therefore, we cannot predict what format any particular device uses | |
1718 | * and must detect it automatically. | |
1719 | */ | |
1720 | void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, | |
1721 | struct snd_usb_endpoint *sender, | |
1722 | const struct urb *urb) | |
1723 | { | |
1724 | int shift; | |
1725 | unsigned int f; | |
1726 | unsigned long flags; | |
1727 | ||
1728 | snd_BUG_ON(ep == sender); | |
1729 | ||
1730 | if (snd_usb_endpoint_implict_feedback_sink(ep) && | |
1731 | ep->use_count != 0) { | |
1732 | ||
1733 | /* implicit feedback case */ | |
1734 | int i, bytes = 0; | |
1735 | struct snd_urb_ctx *in_ctx; | |
1736 | struct snd_usb_packet_info *out_packet; | |
1737 | ||
1738 | in_ctx = urb->context; | |
1739 | ||
1740 | /* Count overall packet size */ | |
1741 | for (i = 0; i < in_ctx->packets; i++) | |
1742 | if (urb->iso_frame_desc[i].status == 0) | |
1743 | bytes += urb->iso_frame_desc[i].actual_length; | |
1744 | ||
1745 | /* | |
1746 | * skip empty packets. At least M-Audio's Fast Track Ultra stops | |
1747 | * streaming once it received a 0-byte OUT URB | |
1748 | */ | |
1749 | if (bytes == 0) | |
1750 | return; | |
1751 | ||
1752 | spin_lock_irqsave(&ep->lock, flags); | |
1753 | out_packet = ep->next_packet + ep->next_packet_write_pos; | |
1754 | ||
1755 | /* | |
1756 | * Iterate through the inbound packet and prepare the lengths | |
1757 | * for the output packet. The OUT packet we are about to send | |
1758 | * will have the same amount of payload than the IN packet we | |
1759 | * just received. | |
1760 | */ | |
1761 | ||
1762 | out_packet->packets = in_ctx->packets; | |
1763 | for (i = 0; i < in_ctx->packets; i++) { | |
1764 | if (urb->iso_frame_desc[i].status == 0) | |
1765 | out_packet->packet_size[i] = | |
1766 | urb->iso_frame_desc[i].actual_length / ep->stride; | |
1767 | else | |
1768 | out_packet->packet_size[i] = 0; | |
1769 | } | |
1770 | ||
1771 | ep->next_packet_write_pos++; | |
1772 | ep->next_packet_write_pos %= MAX_URBS; | |
1773 | spin_unlock_irqrestore(&ep->lock, flags); | |
1774 | queue_pending_output_urbs(ep); | |
1775 | ||
1776 | return; | |
1777 | } | |
1778 | ||
1779 | /* parse sync endpoint packet */ | |
1780 | ||
1781 | if (urb->iso_frame_desc[0].status != 0 || | |
1782 | urb->iso_frame_desc[0].actual_length < 3) | |
1783 | return; | |
1784 | ||
1785 | f = le32_to_cpup(urb->transfer_buffer); | |
1786 | if (urb->iso_frame_desc[0].actual_length == 3) | |
1787 | f &= 0x00ffffff; | |
1788 | else | |
1789 | f &= 0x0fffffff; | |
1790 | ||
1791 | if (f == 0) | |
1792 | return; | |
1793 | ||
1794 | if (unlikely(ep->freqshift == INT_MIN)) { | |
1795 | /* | |
1796 | * The first time we see a feedback value, determine its format | |
1797 | * by shifting it left or right until it matches the nominal | |
1798 | * frequency value. This assumes that the feedback does not | |
1799 | * differ from the nominal value more than +50% or -25%. | |
1800 | */ | |
1801 | shift = 0; | |
1802 | while (f < ep->freqn - ep->freqn / 4) { | |
1803 | f <<= 1; | |
1804 | shift++; | |
1805 | } | |
1806 | while (f > ep->freqn + ep->freqn / 2) { | |
1807 | f >>= 1; | |
1808 | shift--; | |
1809 | } | |
1810 | ep->freqshift = shift; | |
1811 | } else if (ep->freqshift >= 0) | |
1812 | f <<= ep->freqshift; | |
1813 | else | |
1814 | f >>= -ep->freqshift; | |
1815 | ||
1816 | if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) { | |
1817 | /* | |
1818 | * If the frequency looks valid, set it. | |
1819 | * This value is referred to in prepare_playback_urb(). | |
1820 | */ | |
1821 | spin_lock_irqsave(&ep->lock, flags); | |
1822 | ep->freqm = f; | |
1823 | spin_unlock_irqrestore(&ep->lock, flags); | |
1824 | } else { | |
1825 | /* | |
1826 | * Out of range; maybe the shift value is wrong. | |
1827 | * Reset it so that we autodetect again the next time. | |
1828 | */ | |
1829 | ep->freqshift = INT_MIN; | |
1830 | } | |
1831 | } | |
1832 |