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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> | |
23 | ||
24 | #include <sound/core.h> | |
25 | #include <sound/pcm.h> | |
26 | ||
27 | #include "usbaudio.h" | |
28 | #include "helper.h" | |
29 | #include "card.h" | |
30 | #include "endpoint.h" | |
31 | #include "pcm.h" | |
32 | ||
33 | /* | |
34 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) | |
35 | * this will overflow at approx 524 kHz | |
36 | */ | |
37 | static inline unsigned get_usb_full_speed_rate(unsigned int rate) | |
38 | { | |
39 | return ((rate << 13) + 62) / 125; | |
40 | } | |
41 | ||
42 | /* | |
43 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) | |
44 | * this will overflow at approx 4 MHz | |
45 | */ | |
46 | static inline unsigned get_usb_high_speed_rate(unsigned int rate) | |
47 | { | |
48 | return ((rate << 10) + 62) / 125; | |
49 | } | |
50 | ||
51 | /* | |
52 | * unlink active urbs. | |
53 | */ | |
54 | static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep) | |
55 | { | |
56 | struct snd_usb_audio *chip = subs->stream->chip; | |
57 | unsigned int i; | |
58 | int async; | |
59 | ||
60 | subs->running = 0; | |
61 | ||
62 | if (!force && subs->stream->chip->shutdown) /* to be sure... */ | |
63 | return -EBADFD; | |
64 | ||
65 | async = !can_sleep && chip->async_unlink; | |
66 | ||
67 | if (!async && in_interrupt()) | |
68 | return 0; | |
69 | ||
70 | for (i = 0; i < subs->nurbs; i++) { | |
71 | if (test_bit(i, &subs->active_mask)) { | |
72 | if (!test_and_set_bit(i, &subs->unlink_mask)) { | |
73 | struct urb *u = subs->dataurb[i].urb; | |
74 | if (async) | |
75 | usb_unlink_urb(u); | |
76 | else | |
77 | usb_kill_urb(u); | |
78 | } | |
79 | } | |
80 | } | |
81 | if (subs->syncpipe) { | |
82 | for (i = 0; i < SYNC_URBS; i++) { | |
83 | if (test_bit(i+16, &subs->active_mask)) { | |
84 | if (!test_and_set_bit(i+16, &subs->unlink_mask)) { | |
85 | struct urb *u = subs->syncurb[i].urb; | |
86 | if (async) | |
87 | usb_unlink_urb(u); | |
88 | else | |
89 | usb_kill_urb(u); | |
90 | } | |
91 | } | |
92 | } | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | ||
98 | /* | |
99 | * release a urb data | |
100 | */ | |
101 | static void release_urb_ctx(struct snd_urb_ctx *u) | |
102 | { | |
103 | if (u->urb) { | |
104 | if (u->buffer_size) | |
105 | usb_free_coherent(u->subs->dev, u->buffer_size, | |
106 | u->urb->transfer_buffer, | |
107 | u->urb->transfer_dma); | |
108 | usb_free_urb(u->urb); | |
109 | u->urb = NULL; | |
110 | } | |
111 | } | |
112 | ||
113 | /* | |
114 | * wait until all urbs are processed. | |
115 | */ | |
116 | static int wait_clear_urbs(struct snd_usb_substream *subs) | |
117 | { | |
118 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); | |
119 | unsigned int i; | |
120 | int alive; | |
121 | ||
122 | do { | |
123 | alive = 0; | |
124 | for (i = 0; i < subs->nurbs; i++) { | |
125 | if (test_bit(i, &subs->active_mask)) | |
126 | alive++; | |
127 | } | |
128 | if (subs->syncpipe) { | |
129 | for (i = 0; i < SYNC_URBS; i++) { | |
130 | if (test_bit(i + 16, &subs->active_mask)) | |
131 | alive++; | |
132 | } | |
133 | } | |
134 | if (! alive) | |
135 | break; | |
136 | schedule_timeout_uninterruptible(1); | |
137 | } while (time_before(jiffies, end_time)); | |
138 | if (alive) | |
139 | snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /* | |
144 | * release a substream | |
145 | */ | |
146 | void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force) | |
147 | { | |
148 | int i; | |
149 | ||
150 | /* stop urbs (to be sure) */ | |
151 | deactivate_urbs(subs, force, 1); | |
152 | wait_clear_urbs(subs); | |
153 | ||
154 | for (i = 0; i < MAX_URBS; i++) | |
155 | release_urb_ctx(&subs->dataurb[i]); | |
156 | for (i = 0; i < SYNC_URBS; i++) | |
157 | release_urb_ctx(&subs->syncurb[i]); | |
158 | usb_free_coherent(subs->dev, SYNC_URBS * 4, | |
159 | subs->syncbuf, subs->sync_dma); | |
160 | subs->syncbuf = NULL; | |
161 | subs->nurbs = 0; | |
162 | } | |
163 | ||
164 | /* | |
165 | * complete callback from data urb | |
166 | */ | |
167 | static void snd_complete_urb(struct urb *urb) | |
168 | { | |
169 | struct snd_urb_ctx *ctx = urb->context; | |
170 | struct snd_usb_substream *subs = ctx->subs; | |
171 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; | |
172 | int err = 0; | |
173 | ||
174 | if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) || | |
175 | !subs->running || /* can be stopped during retire callback */ | |
176 | (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 || | |
177 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
178 | clear_bit(ctx->index, &subs->active_mask); | |
179 | if (err < 0) { | |
180 | snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err); | |
181 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
182 | } | |
183 | } | |
184 | } | |
185 | ||
186 | ||
187 | /* | |
188 | * complete callback from sync urb | |
189 | */ | |
190 | static void snd_complete_sync_urb(struct urb *urb) | |
191 | { | |
192 | struct snd_urb_ctx *ctx = urb->context; | |
193 | struct snd_usb_substream *subs = ctx->subs; | |
194 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; | |
195 | int err = 0; | |
196 | ||
197 | if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) || | |
198 | !subs->running || /* can be stopped during retire callback */ | |
199 | (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 || | |
200 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
201 | clear_bit(ctx->index + 16, &subs->active_mask); | |
202 | if (err < 0) { | |
203 | snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err); | |
204 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | ||
210 | /* | |
211 | * initialize a substream for plaback/capture | |
212 | */ | |
213 | int snd_usb_init_substream_urbs(struct snd_usb_substream *subs, | |
214 | unsigned int period_bytes, | |
215 | unsigned int rate, | |
216 | unsigned int frame_bits) | |
217 | { | |
218 | unsigned int maxsize, i; | |
219 | int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; | |
220 | unsigned int urb_packs, total_packs, packs_per_ms; | |
221 | struct snd_usb_audio *chip = subs->stream->chip; | |
222 | ||
223 | /* calculate the frequency in 16.16 format */ | |
224 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) | |
225 | subs->freqn = get_usb_full_speed_rate(rate); | |
226 | else | |
227 | subs->freqn = get_usb_high_speed_rate(rate); | |
228 | subs->freqm = subs->freqn; | |
229 | subs->freqshift = INT_MIN; | |
230 | /* calculate max. frequency */ | |
231 | if (subs->maxpacksize) { | |
232 | /* whatever fits into a max. size packet */ | |
233 | maxsize = subs->maxpacksize; | |
234 | subs->freqmax = (maxsize / (frame_bits >> 3)) | |
235 | << (16 - subs->datainterval); | |
236 | } else { | |
237 | /* no max. packet size: just take 25% higher than nominal */ | |
238 | subs->freqmax = subs->freqn + (subs->freqn >> 2); | |
239 | maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) | |
240 | >> (16 - subs->datainterval); | |
241 | } | |
242 | subs->phase = 0; | |
243 | ||
244 | if (subs->fill_max) | |
245 | subs->curpacksize = subs->maxpacksize; | |
246 | else | |
247 | subs->curpacksize = maxsize; | |
248 | ||
249 | if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) | |
250 | packs_per_ms = 8 >> subs->datainterval; | |
251 | else | |
252 | packs_per_ms = 1; | |
253 | ||
254 | if (is_playback) { | |
255 | urb_packs = max(chip->nrpacks, 1); | |
256 | urb_packs = min(urb_packs, (unsigned int)MAX_PACKS); | |
257 | } else | |
258 | urb_packs = 1; | |
259 | urb_packs *= packs_per_ms; | |
260 | if (subs->syncpipe) | |
261 | urb_packs = min(urb_packs, 1U << subs->syncinterval); | |
262 | ||
263 | /* decide how many packets to be used */ | |
264 | if (is_playback) { | |
265 | unsigned int minsize, maxpacks; | |
266 | /* determine how small a packet can be */ | |
267 | minsize = (subs->freqn >> (16 - subs->datainterval)) | |
268 | * (frame_bits >> 3); | |
269 | /* with sync from device, assume it can be 12% lower */ | |
270 | if (subs->syncpipe) | |
271 | minsize -= minsize >> 3; | |
272 | minsize = max(minsize, 1u); | |
273 | total_packs = (period_bytes + minsize - 1) / minsize; | |
274 | /* we need at least two URBs for queueing */ | |
275 | if (total_packs < 2) { | |
276 | total_packs = 2; | |
277 | } else { | |
278 | /* and we don't want too long a queue either */ | |
279 | maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); | |
280 | total_packs = min(total_packs, maxpacks); | |
281 | } | |
282 | } else { | |
283 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) | |
284 | urb_packs >>= 1; | |
285 | total_packs = MAX_URBS * urb_packs; | |
286 | } | |
287 | subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; | |
288 | if (subs->nurbs > MAX_URBS) { | |
289 | /* too much... */ | |
290 | subs->nurbs = MAX_URBS; | |
291 | total_packs = MAX_URBS * urb_packs; | |
292 | } else if (subs->nurbs < 2) { | |
293 | /* too little - we need at least two packets | |
294 | * to ensure contiguous playback/capture | |
295 | */ | |
296 | subs->nurbs = 2; | |
297 | } | |
298 | ||
299 | /* allocate and initialize data urbs */ | |
300 | for (i = 0; i < subs->nurbs; i++) { | |
301 | struct snd_urb_ctx *u = &subs->dataurb[i]; | |
302 | u->index = i; | |
303 | u->subs = subs; | |
304 | u->packets = (i + 1) * total_packs / subs->nurbs | |
305 | - i * total_packs / subs->nurbs; | |
306 | u->buffer_size = maxsize * u->packets; | |
307 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) | |
308 | u->packets++; /* for transfer delimiter */ | |
309 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); | |
310 | if (!u->urb) | |
311 | goto out_of_memory; | |
312 | u->urb->transfer_buffer = | |
313 | usb_alloc_coherent(subs->dev, u->buffer_size, | |
314 | GFP_KERNEL, &u->urb->transfer_dma); | |
315 | if (!u->urb->transfer_buffer) | |
316 | goto out_of_memory; | |
317 | u->urb->pipe = subs->datapipe; | |
318 | u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
319 | u->urb->interval = 1 << subs->datainterval; | |
320 | u->urb->context = u; | |
321 | u->urb->complete = snd_complete_urb; | |
322 | } | |
323 | ||
324 | if (subs->syncpipe) { | |
325 | /* allocate and initialize sync urbs */ | |
326 | subs->syncbuf = usb_alloc_coherent(subs->dev, SYNC_URBS * 4, | |
327 | GFP_KERNEL, &subs->sync_dma); | |
328 | if (!subs->syncbuf) | |
329 | goto out_of_memory; | |
330 | for (i = 0; i < SYNC_URBS; i++) { | |
331 | struct snd_urb_ctx *u = &subs->syncurb[i]; | |
332 | u->index = i; | |
333 | u->subs = subs; | |
334 | u->packets = 1; | |
335 | u->urb = usb_alloc_urb(1, GFP_KERNEL); | |
336 | if (!u->urb) | |
337 | goto out_of_memory; | |
338 | u->urb->transfer_buffer = subs->syncbuf + i * 4; | |
339 | u->urb->transfer_dma = subs->sync_dma + i * 4; | |
340 | u->urb->transfer_buffer_length = 4; | |
341 | u->urb->pipe = subs->syncpipe; | |
342 | u->urb->transfer_flags = URB_ISO_ASAP | | |
343 | URB_NO_TRANSFER_DMA_MAP; | |
344 | u->urb->number_of_packets = 1; | |
345 | u->urb->interval = 1 << subs->syncinterval; | |
346 | u->urb->context = u; | |
347 | u->urb->complete = snd_complete_sync_urb; | |
348 | } | |
349 | } | |
350 | return 0; | |
351 | ||
352 | out_of_memory: | |
353 | snd_usb_release_substream_urbs(subs, 0); | |
354 | return -ENOMEM; | |
355 | } | |
356 | ||
357 | /* | |
358 | * prepare urb for full speed capture sync pipe | |
359 | * | |
360 | * fill the length and offset of each urb descriptor. | |
361 | * the fixed 10.14 frequency is passed through the pipe. | |
362 | */ | |
363 | static int prepare_capture_sync_urb(struct snd_usb_substream *subs, | |
364 | struct snd_pcm_runtime *runtime, | |
365 | struct urb *urb) | |
366 | { | |
367 | unsigned char *cp = urb->transfer_buffer; | |
368 | struct snd_urb_ctx *ctx = urb->context; | |
369 | ||
370 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
371 | urb->iso_frame_desc[0].length = 3; | |
372 | urb->iso_frame_desc[0].offset = 0; | |
373 | cp[0] = subs->freqn >> 2; | |
374 | cp[1] = subs->freqn >> 10; | |
375 | cp[2] = subs->freqn >> 18; | |
376 | return 0; | |
377 | } | |
378 | ||
379 | /* | |
380 | * prepare urb for high speed capture sync pipe | |
381 | * | |
382 | * fill the length and offset of each urb descriptor. | |
383 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. | |
384 | */ | |
385 | static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs, | |
386 | struct snd_pcm_runtime *runtime, | |
387 | struct urb *urb) | |
388 | { | |
389 | unsigned char *cp = urb->transfer_buffer; | |
390 | struct snd_urb_ctx *ctx = urb->context; | |
391 | ||
392 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
393 | urb->iso_frame_desc[0].length = 4; | |
394 | urb->iso_frame_desc[0].offset = 0; | |
395 | cp[0] = subs->freqn; | |
396 | cp[1] = subs->freqn >> 8; | |
397 | cp[2] = subs->freqn >> 16; | |
398 | cp[3] = subs->freqn >> 24; | |
399 | return 0; | |
400 | } | |
401 | ||
402 | /* | |
403 | * process after capture sync complete | |
404 | * - nothing to do | |
405 | */ | |
406 | static int retire_capture_sync_urb(struct snd_usb_substream *subs, | |
407 | struct snd_pcm_runtime *runtime, | |
408 | struct urb *urb) | |
409 | { | |
410 | return 0; | |
411 | } | |
412 | ||
413 | /* | |
414 | * prepare urb for capture data pipe | |
415 | * | |
416 | * fill the offset and length of each descriptor. | |
417 | * | |
418 | * we use a temporary buffer to write the captured data. | |
419 | * since the length of written data is determined by host, we cannot | |
420 | * write onto the pcm buffer directly... the data is thus copied | |
421 | * later at complete callback to the global buffer. | |
422 | */ | |
423 | static int prepare_capture_urb(struct snd_usb_substream *subs, | |
424 | struct snd_pcm_runtime *runtime, | |
425 | struct urb *urb) | |
426 | { | |
427 | int i, offs; | |
428 | struct snd_urb_ctx *ctx = urb->context; | |
429 | ||
430 | offs = 0; | |
431 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
432 | for (i = 0; i < ctx->packets; i++) { | |
433 | urb->iso_frame_desc[i].offset = offs; | |
434 | urb->iso_frame_desc[i].length = subs->curpacksize; | |
435 | offs += subs->curpacksize; | |
436 | } | |
437 | urb->transfer_buffer_length = offs; | |
438 | urb->number_of_packets = ctx->packets; | |
439 | return 0; | |
440 | } | |
441 | ||
442 | /* | |
443 | * process after capture complete | |
444 | * | |
445 | * copy the data from each desctiptor to the pcm buffer, and | |
446 | * update the current position. | |
447 | */ | |
448 | static int retire_capture_urb(struct snd_usb_substream *subs, | |
449 | struct snd_pcm_runtime *runtime, | |
450 | struct urb *urb) | |
451 | { | |
452 | unsigned long flags; | |
453 | unsigned char *cp; | |
454 | int i; | |
455 | unsigned int stride, frames, bytes, oldptr; | |
456 | int period_elapsed = 0; | |
457 | ||
458 | stride = runtime->frame_bits >> 3; | |
459 | ||
460 | for (i = 0; i < urb->number_of_packets; i++) { | |
461 | cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
80c8a2a3 TI |
462 | if (urb->iso_frame_desc[i].status && printk_ratelimit()) { |
463 | snd_printdd("frame %d active: %d\n", i, urb->iso_frame_desc[i].status); | |
c731bc96 DM |
464 | // continue; |
465 | } | |
466 | bytes = urb->iso_frame_desc[i].actual_length; | |
467 | frames = bytes / stride; | |
468 | if (!subs->txfr_quirk) | |
469 | bytes = frames * stride; | |
470 | if (bytes % (runtime->sample_bits >> 3) != 0) { | |
471 | #ifdef CONFIG_SND_DEBUG_VERBOSE | |
472 | int oldbytes = bytes; | |
473 | #endif | |
474 | bytes = frames * stride; | |
475 | snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", | |
476 | oldbytes, bytes); | |
477 | } | |
478 | /* update the current pointer */ | |
479 | spin_lock_irqsave(&subs->lock, flags); | |
480 | oldptr = subs->hwptr_done; | |
481 | subs->hwptr_done += bytes; | |
482 | if (subs->hwptr_done >= runtime->buffer_size * stride) | |
483 | subs->hwptr_done -= runtime->buffer_size * stride; | |
484 | frames = (bytes + (oldptr % stride)) / stride; | |
485 | subs->transfer_done += frames; | |
486 | if (subs->transfer_done >= runtime->period_size) { | |
487 | subs->transfer_done -= runtime->period_size; | |
488 | period_elapsed = 1; | |
489 | } | |
490 | spin_unlock_irqrestore(&subs->lock, flags); | |
491 | /* copy a data chunk */ | |
492 | if (oldptr + bytes > runtime->buffer_size * stride) { | |
493 | unsigned int bytes1 = | |
494 | runtime->buffer_size * stride - oldptr; | |
495 | memcpy(runtime->dma_area + oldptr, cp, bytes1); | |
496 | memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); | |
497 | } else { | |
498 | memcpy(runtime->dma_area + oldptr, cp, bytes); | |
499 | } | |
500 | } | |
501 | if (period_elapsed) | |
502 | snd_pcm_period_elapsed(subs->pcm_substream); | |
503 | return 0; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Process after capture complete when paused. Nothing to do. | |
508 | */ | |
509 | static int retire_paused_capture_urb(struct snd_usb_substream *subs, | |
510 | struct snd_pcm_runtime *runtime, | |
511 | struct urb *urb) | |
512 | { | |
513 | return 0; | |
514 | } | |
515 | ||
516 | ||
517 | /* | |
518 | * prepare urb for playback sync pipe | |
519 | * | |
520 | * set up the offset and length to receive the current frequency. | |
521 | */ | |
522 | static int prepare_playback_sync_urb(struct snd_usb_substream *subs, | |
523 | struct snd_pcm_runtime *runtime, | |
524 | struct urb *urb) | |
525 | { | |
526 | struct snd_urb_ctx *ctx = urb->context; | |
527 | ||
528 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
529 | urb->iso_frame_desc[0].length = min(4u, ctx->subs->syncmaxsize); | |
530 | urb->iso_frame_desc[0].offset = 0; | |
531 | return 0; | |
532 | } | |
533 | ||
534 | /* | |
535 | * process after playback sync complete | |
536 | * | |
537 | * Full speed devices report feedback values in 10.14 format as samples per | |
538 | * frame, high speed devices in 16.16 format as samples per microframe. | |
539 | * Because the Audio Class 1 spec was written before USB 2.0, many high speed | |
540 | * devices use a wrong interpretation, some others use an entirely different | |
541 | * format. Therefore, we cannot predict what format any particular device uses | |
542 | * and must detect it automatically. | |
543 | */ | |
544 | static int retire_playback_sync_urb(struct snd_usb_substream *subs, | |
545 | struct snd_pcm_runtime *runtime, | |
546 | struct urb *urb) | |
547 | { | |
548 | unsigned int f; | |
549 | int shift; | |
550 | unsigned long flags; | |
551 | ||
552 | if (urb->iso_frame_desc[0].status != 0 || | |
553 | urb->iso_frame_desc[0].actual_length < 3) | |
554 | return 0; | |
555 | ||
556 | f = le32_to_cpup(urb->transfer_buffer); | |
557 | if (urb->iso_frame_desc[0].actual_length == 3) | |
558 | f &= 0x00ffffff; | |
559 | else | |
560 | f &= 0x0fffffff; | |
561 | if (f == 0) | |
562 | return 0; | |
563 | ||
564 | if (unlikely(subs->freqshift == INT_MIN)) { | |
565 | /* | |
566 | * The first time we see a feedback value, determine its format | |
567 | * by shifting it left or right until it matches the nominal | |
568 | * frequency value. This assumes that the feedback does not | |
569 | * differ from the nominal value more than +50% or -25%. | |
570 | */ | |
571 | shift = 0; | |
572 | while (f < subs->freqn - subs->freqn / 4) { | |
573 | f <<= 1; | |
574 | shift++; | |
575 | } | |
576 | while (f > subs->freqn + subs->freqn / 2) { | |
577 | f >>= 1; | |
578 | shift--; | |
579 | } | |
580 | subs->freqshift = shift; | |
581 | } | |
582 | else if (subs->freqshift >= 0) | |
583 | f <<= subs->freqshift; | |
584 | else | |
585 | f >>= -subs->freqshift; | |
586 | ||
587 | if (likely(f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax)) { | |
588 | /* | |
589 | * If the frequency looks valid, set it. | |
590 | * This value is referred to in prepare_playback_urb(). | |
591 | */ | |
592 | spin_lock_irqsave(&subs->lock, flags); | |
593 | subs->freqm = f; | |
594 | spin_unlock_irqrestore(&subs->lock, flags); | |
595 | } else { | |
596 | /* | |
597 | * Out of range; maybe the shift value is wrong. | |
598 | * Reset it so that we autodetect again the next time. | |
599 | */ | |
600 | subs->freqshift = INT_MIN; | |
601 | } | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
606 | /* determine the number of frames in the next packet */ | |
607 | static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs) | |
608 | { | |
609 | if (subs->fill_max) | |
610 | return subs->maxframesize; | |
611 | else { | |
612 | subs->phase = (subs->phase & 0xffff) | |
613 | + (subs->freqm << subs->datainterval); | |
614 | return min(subs->phase >> 16, subs->maxframesize); | |
615 | } | |
616 | } | |
617 | ||
618 | /* | |
619 | * Prepare urb for streaming before playback starts or when paused. | |
620 | * | |
621 | * We don't have any data, so we send silence. | |
622 | */ | |
623 | static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, | |
624 | struct snd_pcm_runtime *runtime, | |
625 | struct urb *urb) | |
626 | { | |
627 | unsigned int i, offs, counts; | |
628 | struct snd_urb_ctx *ctx = urb->context; | |
629 | int stride = runtime->frame_bits >> 3; | |
630 | ||
631 | offs = 0; | |
632 | urb->dev = ctx->subs->dev; | |
633 | for (i = 0; i < ctx->packets; ++i) { | |
634 | counts = snd_usb_audio_next_packet_size(subs); | |
635 | urb->iso_frame_desc[i].offset = offs * stride; | |
636 | urb->iso_frame_desc[i].length = counts * stride; | |
637 | offs += counts; | |
638 | } | |
639 | urb->number_of_packets = ctx->packets; | |
640 | urb->transfer_buffer_length = offs * stride; | |
641 | memset(urb->transfer_buffer, | |
642 | runtime->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, | |
643 | offs * stride); | |
644 | return 0; | |
645 | } | |
646 | ||
647 | /* | |
648 | * prepare urb for playback data pipe | |
649 | * | |
650 | * Since a URB can handle only a single linear buffer, we must use double | |
651 | * buffering when the data to be transferred overflows the buffer boundary. | |
652 | * To avoid inconsistencies when updating hwptr_done, we use double buffering | |
653 | * for all URBs. | |
654 | */ | |
655 | static int prepare_playback_urb(struct snd_usb_substream *subs, | |
656 | struct snd_pcm_runtime *runtime, | |
657 | struct urb *urb) | |
658 | { | |
659 | int i, stride; | |
660 | unsigned int counts, frames, bytes; | |
661 | unsigned long flags; | |
662 | int period_elapsed = 0; | |
663 | struct snd_urb_ctx *ctx = urb->context; | |
664 | ||
665 | stride = runtime->frame_bits >> 3; | |
666 | ||
667 | frames = 0; | |
668 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | |
669 | urb->number_of_packets = 0; | |
670 | spin_lock_irqsave(&subs->lock, flags); | |
671 | for (i = 0; i < ctx->packets; i++) { | |
672 | counts = snd_usb_audio_next_packet_size(subs); | |
673 | /* set up descriptor */ | |
674 | urb->iso_frame_desc[i].offset = frames * stride; | |
675 | urb->iso_frame_desc[i].length = counts * stride; | |
676 | frames += counts; | |
677 | urb->number_of_packets++; | |
678 | subs->transfer_done += counts; | |
679 | if (subs->transfer_done >= runtime->period_size) { | |
680 | subs->transfer_done -= runtime->period_size; | |
681 | period_elapsed = 1; | |
682 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) { | |
683 | if (subs->transfer_done > 0) { | |
684 | /* FIXME: fill-max mode is not | |
685 | * supported yet */ | |
686 | frames -= subs->transfer_done; | |
687 | counts -= subs->transfer_done; | |
688 | urb->iso_frame_desc[i].length = | |
689 | counts * stride; | |
690 | subs->transfer_done = 0; | |
691 | } | |
692 | i++; | |
693 | if (i < ctx->packets) { | |
694 | /* add a transfer delimiter */ | |
695 | urb->iso_frame_desc[i].offset = | |
696 | frames * stride; | |
697 | urb->iso_frame_desc[i].length = 0; | |
698 | urb->number_of_packets++; | |
699 | } | |
700 | break; | |
701 | } | |
702 | } | |
703 | if (period_elapsed) /* finish at the period boundary */ | |
704 | break; | |
705 | } | |
706 | bytes = frames * stride; | |
707 | if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { | |
708 | /* err, the transferred area goes over buffer boundary. */ | |
709 | unsigned int bytes1 = | |
710 | runtime->buffer_size * stride - subs->hwptr_done; | |
711 | memcpy(urb->transfer_buffer, | |
712 | runtime->dma_area + subs->hwptr_done, bytes1); | |
713 | memcpy(urb->transfer_buffer + bytes1, | |
714 | runtime->dma_area, bytes - bytes1); | |
715 | } else { | |
716 | memcpy(urb->transfer_buffer, | |
717 | runtime->dma_area + subs->hwptr_done, bytes); | |
718 | } | |
719 | subs->hwptr_done += bytes; | |
720 | if (subs->hwptr_done >= runtime->buffer_size * stride) | |
721 | subs->hwptr_done -= runtime->buffer_size * stride; | |
722 | ||
723 | /* update delay with exact number of samples queued */ | |
724 | runtime->delay = subs->last_delay; | |
725 | runtime->delay += frames; | |
726 | subs->last_delay = runtime->delay; | |
727 | ||
728 | /* realign last_frame_number */ | |
729 | subs->last_frame_number = usb_get_current_frame_number(subs->dev); | |
730 | subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ | |
731 | ||
732 | spin_unlock_irqrestore(&subs->lock, flags); | |
733 | urb->transfer_buffer_length = bytes; | |
734 | if (period_elapsed) | |
735 | snd_pcm_period_elapsed(subs->pcm_substream); | |
736 | return 0; | |
737 | } | |
738 | ||
739 | /* | |
740 | * process after playback data complete | |
741 | * - decrease the delay count again | |
742 | */ | |
743 | static int retire_playback_urb(struct snd_usb_substream *subs, | |
744 | struct snd_pcm_runtime *runtime, | |
745 | struct urb *urb) | |
746 | { | |
747 | unsigned long flags; | |
748 | int stride = runtime->frame_bits >> 3; | |
749 | int processed = urb->transfer_buffer_length / stride; | |
750 | int est_delay; | |
751 | ||
752 | spin_lock_irqsave(&subs->lock, flags); | |
753 | ||
754 | est_delay = snd_usb_pcm_delay(subs, runtime->rate); | |
755 | /* update delay with exact number of samples played */ | |
756 | if (processed > subs->last_delay) | |
757 | subs->last_delay = 0; | |
758 | else | |
759 | subs->last_delay -= processed; | |
760 | runtime->delay = subs->last_delay; | |
761 | ||
762 | /* | |
763 | * Report when delay estimate is off by more than 2ms. | |
764 | * The error should be lower than 2ms since the estimate relies | |
765 | * on two reads of a counter updated every ms. | |
766 | */ | |
767 | if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) | |
768 | snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", | |
769 | est_delay, subs->last_delay); | |
770 | ||
771 | spin_unlock_irqrestore(&subs->lock, flags); | |
772 | return 0; | |
773 | } | |
774 | ||
775 | static const char *usb_error_string(int err) | |
776 | { | |
777 | switch (err) { | |
778 | case -ENODEV: | |
779 | return "no device"; | |
780 | case -ENOENT: | |
781 | return "endpoint not enabled"; | |
782 | case -EPIPE: | |
783 | return "endpoint stalled"; | |
784 | case -ENOSPC: | |
785 | return "not enough bandwidth"; | |
786 | case -ESHUTDOWN: | |
787 | return "device disabled"; | |
788 | case -EHOSTUNREACH: | |
789 | return "device suspended"; | |
790 | case -EINVAL: | |
791 | case -EAGAIN: | |
792 | case -EFBIG: | |
793 | case -EMSGSIZE: | |
794 | return "internal error"; | |
795 | default: | |
796 | return "unknown error"; | |
797 | } | |
798 | } | |
799 | ||
800 | /* | |
801 | * set up and start data/sync urbs | |
802 | */ | |
803 | static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime) | |
804 | { | |
805 | unsigned int i; | |
806 | int err; | |
807 | ||
808 | if (subs->stream->chip->shutdown) | |
809 | return -EBADFD; | |
810 | ||
811 | for (i = 0; i < subs->nurbs; i++) { | |
812 | if (snd_BUG_ON(!subs->dataurb[i].urb)) | |
813 | return -EINVAL; | |
814 | if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) { | |
815 | snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i); | |
816 | goto __error; | |
817 | } | |
818 | } | |
819 | if (subs->syncpipe) { | |
820 | for (i = 0; i < SYNC_URBS; i++) { | |
821 | if (snd_BUG_ON(!subs->syncurb[i].urb)) | |
822 | return -EINVAL; | |
823 | if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) { | |
824 | snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i); | |
825 | goto __error; | |
826 | } | |
827 | } | |
828 | } | |
829 | ||
830 | subs->active_mask = 0; | |
831 | subs->unlink_mask = 0; | |
832 | subs->running = 1; | |
833 | for (i = 0; i < subs->nurbs; i++) { | |
834 | err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC); | |
835 | if (err < 0) { | |
836 | snd_printk(KERN_ERR "cannot submit datapipe " | |
837 | "for urb %d, error %d: %s\n", | |
838 | i, err, usb_error_string(err)); | |
839 | goto __error; | |
840 | } | |
841 | set_bit(i, &subs->active_mask); | |
842 | } | |
843 | if (subs->syncpipe) { | |
844 | for (i = 0; i < SYNC_URBS; i++) { | |
845 | err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC); | |
846 | if (err < 0) { | |
847 | snd_printk(KERN_ERR "cannot submit syncpipe " | |
848 | "for urb %d, error %d: %s\n", | |
849 | i, err, usb_error_string(err)); | |
850 | goto __error; | |
851 | } | |
852 | set_bit(i + 16, &subs->active_mask); | |
853 | } | |
854 | } | |
855 | return 0; | |
856 | ||
857 | __error: | |
858 | // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN); | |
859 | deactivate_urbs(subs, 0, 0); | |
860 | return -EPIPE; | |
861 | } | |
862 | ||
863 | ||
864 | /* | |
865 | */ | |
866 | static struct snd_urb_ops audio_urb_ops[2] = { | |
867 | { | |
868 | .prepare = prepare_nodata_playback_urb, | |
869 | .retire = retire_playback_urb, | |
870 | .prepare_sync = prepare_playback_sync_urb, | |
871 | .retire_sync = retire_playback_sync_urb, | |
872 | }, | |
873 | { | |
874 | .prepare = prepare_capture_urb, | |
875 | .retire = retire_capture_urb, | |
876 | .prepare_sync = prepare_capture_sync_urb, | |
877 | .retire_sync = retire_capture_sync_urb, | |
878 | }, | |
879 | }; | |
880 | ||
881 | /* | |
882 | * initialize the substream instance. | |
883 | */ | |
884 | ||
885 | void snd_usb_init_substream(struct snd_usb_stream *as, | |
886 | int stream, struct audioformat *fp) | |
887 | { | |
888 | struct snd_usb_substream *subs = &as->substream[stream]; | |
889 | ||
890 | INIT_LIST_HEAD(&subs->fmt_list); | |
891 | spin_lock_init(&subs->lock); | |
892 | ||
893 | subs->stream = as; | |
894 | subs->direction = stream; | |
895 | subs->dev = as->chip->dev; | |
896 | subs->txfr_quirk = as->chip->txfr_quirk; | |
897 | subs->ops = audio_urb_ops[stream]; | |
898 | if (snd_usb_get_speed(subs->dev) >= USB_SPEED_HIGH) | |
899 | subs->ops.prepare_sync = prepare_capture_sync_urb_hs; | |
900 | ||
901 | snd_usb_set_pcm_ops(as->pcm, stream); | |
902 | ||
903 | list_add_tail(&fp->list, &subs->fmt_list); | |
904 | subs->formats |= fp->formats; | |
905 | subs->endpoint = fp->endpoint; | |
906 | subs->num_formats++; | |
907 | subs->fmt_type = fp->fmt_type; | |
908 | } | |
909 | ||
910 | int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd) | |
911 | { | |
912 | struct snd_usb_substream *subs = substream->runtime->private_data; | |
913 | ||
914 | switch (cmd) { | |
915 | case SNDRV_PCM_TRIGGER_START: | |
916 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
917 | subs->ops.prepare = prepare_playback_urb; | |
918 | return 0; | |
919 | case SNDRV_PCM_TRIGGER_STOP: | |
920 | return deactivate_urbs(subs, 0, 0); | |
921 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
922 | subs->ops.prepare = prepare_nodata_playback_urb; | |
923 | return 0; | |
924 | } | |
925 | ||
926 | return -EINVAL; | |
927 | } | |
928 | ||
929 | int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd) | |
930 | { | |
931 | struct snd_usb_substream *subs = substream->runtime->private_data; | |
932 | ||
933 | switch (cmd) { | |
934 | case SNDRV_PCM_TRIGGER_START: | |
935 | subs->ops.retire = retire_capture_urb; | |
936 | return start_urbs(subs, substream->runtime); | |
937 | case SNDRV_PCM_TRIGGER_STOP: | |
938 | return deactivate_urbs(subs, 0, 0); | |
939 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
940 | subs->ops.retire = retire_paused_capture_urb; | |
941 | return 0; | |
942 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
943 | subs->ops.retire = retire_capture_urb; | |
944 | return 0; | |
945 | } | |
946 | ||
947 | return -EINVAL; | |
948 | } | |
949 | ||
950 | int snd_usb_substream_prepare(struct snd_usb_substream *subs, | |
951 | struct snd_pcm_runtime *runtime) | |
952 | { | |
953 | /* clear urbs (to be sure) */ | |
954 | deactivate_urbs(subs, 0, 1); | |
955 | wait_clear_urbs(subs); | |
956 | ||
957 | /* for playback, submit the URBs now; otherwise, the first hwptr_done | |
958 | * updates for all URBs would happen at the same time when starting */ | |
959 | if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { | |
960 | subs->ops.prepare = prepare_nodata_playback_urb; | |
961 | return start_urbs(subs, runtime); | |
962 | } | |
963 | ||
964 | return 0; | |
965 | } | |
966 |