diff options
Diffstat (limited to 'sound/usb/urb.c')
-rw-r--r-- | sound/usb/urb.c | 989 |
1 files changed, 989 insertions, 0 deletions
diff --git a/sound/usb/urb.c b/sound/usb/urb.c new file mode 100644 index 000000000000..e9c339f75861 --- /dev/null +++ b/sound/usb/urb.c | |||
@@ -0,0 +1,989 @@ | |||
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 | |||
18 | #include <linux/init.h> | ||
19 | #include <linux/usb.h> | ||
20 | #include <linux/usb/audio.h> | ||
21 | |||
22 | #include <sound/core.h> | ||
23 | #include <sound/pcm.h> | ||
24 | |||
25 | #include "usbaudio.h" | ||
26 | #include "helper.h" | ||
27 | #include "card.h" | ||
28 | #include "urb.h" | ||
29 | #include "pcm.h" | ||
30 | |||
31 | /* | ||
32 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) | ||
33 | * this will overflow at approx 524 kHz | ||
34 | */ | ||
35 | static inline unsigned get_usb_full_speed_rate(unsigned int rate) | ||
36 | { | ||
37 | return ((rate << 13) + 62) / 125; | ||
38 | } | ||
39 | |||
40 | /* | ||
41 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) | ||
42 | * this will overflow at approx 4 MHz | ||
43 | */ | ||
44 | static inline unsigned get_usb_high_speed_rate(unsigned int rate) | ||
45 | { | ||
46 | return ((rate << 10) + 62) / 125; | ||
47 | } | ||
48 | |||
49 | /* | ||
50 | * unlink active urbs. | ||
51 | */ | ||
52 | static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep) | ||
53 | { | ||
54 | struct snd_usb_audio *chip = subs->stream->chip; | ||
55 | unsigned int i; | ||
56 | int async; | ||
57 | |||
58 | subs->running = 0; | ||
59 | |||
60 | if (!force && subs->stream->chip->shutdown) /* to be sure... */ | ||
61 | return -EBADFD; | ||
62 | |||
63 | async = !can_sleep && chip->async_unlink; | ||
64 | |||
65 | if (!async && in_interrupt()) | ||
66 | return 0; | ||
67 | |||
68 | for (i = 0; i < subs->nurbs; i++) { | ||
69 | if (test_bit(i, &subs->active_mask)) { | ||
70 | if (!test_and_set_bit(i, &subs->unlink_mask)) { | ||
71 | struct urb *u = subs->dataurb[i].urb; | ||
72 | if (async) | ||
73 | usb_unlink_urb(u); | ||
74 | else | ||
75 | usb_kill_urb(u); | ||
76 | } | ||
77 | } | ||
78 | } | ||
79 | if (subs->syncpipe) { | ||
80 | for (i = 0; i < SYNC_URBS; i++) { | ||
81 | if (test_bit(i+16, &subs->active_mask)) { | ||
82 | if (!test_and_set_bit(i+16, &subs->unlink_mask)) { | ||
83 | struct urb *u = subs->syncurb[i].urb; | ||
84 | if (async) | ||
85 | usb_unlink_urb(u); | ||
86 | else | ||
87 | usb_kill_urb(u); | ||
88 | } | ||
89 | } | ||
90 | } | ||
91 | } | ||
92 | return 0; | ||
93 | } | ||
94 | |||
95 | |||
96 | /* | ||
97 | * release a urb data | ||
98 | */ | ||
99 | static void release_urb_ctx(struct snd_urb_ctx *u) | ||
100 | { | ||
101 | if (u->urb) { | ||
102 | if (u->buffer_size) | ||
103 | usb_buffer_free(u->subs->dev, u->buffer_size, | ||
104 | u->urb->transfer_buffer, | ||
105 | u->urb->transfer_dma); | ||
106 | usb_free_urb(u->urb); | ||
107 | u->urb = NULL; | ||
108 | } | ||
109 | } | ||
110 | |||
111 | /* | ||
112 | * wait until all urbs are processed. | ||
113 | */ | ||
114 | static int wait_clear_urbs(struct snd_usb_substream *subs) | ||
115 | { | ||
116 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); | ||
117 | unsigned int i; | ||
118 | int alive; | ||
119 | |||
120 | do { | ||
121 | alive = 0; | ||
122 | for (i = 0; i < subs->nurbs; i++) { | ||
123 | if (test_bit(i, &subs->active_mask)) | ||
124 | alive++; | ||
125 | } | ||
126 | if (subs->syncpipe) { | ||
127 | for (i = 0; i < SYNC_URBS; i++) { | ||
128 | if (test_bit(i + 16, &subs->active_mask)) | ||
129 | alive++; | ||
130 | } | ||
131 | } | ||
132 | if (! alive) | ||
133 | break; | ||
134 | schedule_timeout_uninterruptible(1); | ||
135 | } while (time_before(jiffies, end_time)); | ||
136 | if (alive) | ||
137 | snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); | ||
138 | return 0; | ||
139 | } | ||
140 | |||
141 | /* | ||
142 | * release a substream | ||
143 | */ | ||
144 | void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force) | ||
145 | { | ||
146 | int i; | ||
147 | |||
148 | /* stop urbs (to be sure) */ | ||
149 | deactivate_urbs(subs, force, 1); | ||
150 | wait_clear_urbs(subs); | ||
151 | |||
152 | for (i = 0; i < MAX_URBS; i++) | ||
153 | release_urb_ctx(&subs->dataurb[i]); | ||
154 | for (i = 0; i < SYNC_URBS; i++) | ||
155 | release_urb_ctx(&subs->syncurb[i]); | ||
156 | usb_buffer_free(subs->dev, SYNC_URBS * 4, | ||
157 | subs->syncbuf, subs->sync_dma); | ||
158 | subs->syncbuf = NULL; | ||
159 | subs->nurbs = 0; | ||
160 | } | ||
161 | |||
162 | /* | ||
163 | * complete callback from data urb | ||
164 | */ | ||
165 | static void snd_complete_urb(struct urb *urb) | ||
166 | { | ||
167 | struct snd_urb_ctx *ctx = urb->context; | ||
168 | struct snd_usb_substream *subs = ctx->subs; | ||
169 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; | ||
170 | int err = 0; | ||
171 | |||
172 | if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) || | ||
173 | !subs->running || /* can be stopped during retire callback */ | ||
174 | (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 || | ||
175 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | ||
176 | clear_bit(ctx->index, &subs->active_mask); | ||
177 | if (err < 0) { | ||
178 | snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err); | ||
179 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | ||
180 | } | ||
181 | } | ||
182 | } | ||
183 | |||
184 | |||
185 | /* | ||
186 | * complete callback from sync urb | ||
187 | */ | ||
188 | static void snd_complete_sync_urb(struct urb *urb) | ||
189 | { | ||
190 | struct snd_urb_ctx *ctx = urb->context; | ||
191 | struct snd_usb_substream *subs = ctx->subs; | ||
192 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; | ||
193 | int err = 0; | ||
194 | |||
195 | if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) || | ||
196 | !subs->running || /* can be stopped during retire callback */ | ||
197 | (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 || | ||
198 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | ||
199 | clear_bit(ctx->index + 16, &subs->active_mask); | ||
200 | if (err < 0) { | ||
201 | snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err); | ||
202 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | ||
203 | } | ||
204 | } | ||
205 | } | ||
206 | |||
207 | |||
208 | /* | ||
209 | * initialize a substream for plaback/capture | ||
210 | */ | ||
211 | int snd_usb_init_substream_urbs(struct snd_usb_substream *subs, | ||
212 | unsigned int period_bytes, | ||
213 | unsigned int rate, | ||
214 | unsigned int frame_bits) | ||
215 | { | ||
216 | unsigned int maxsize, i; | ||
217 | int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; | ||
218 | unsigned int urb_packs, total_packs, packs_per_ms; | ||
219 | struct snd_usb_audio *chip = subs->stream->chip; | ||
220 | |||
221 | /* calculate the frequency in 16.16 format */ | ||
222 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) | ||
223 | subs->freqn = get_usb_full_speed_rate(rate); | ||
224 | else | ||
225 | subs->freqn = get_usb_high_speed_rate(rate); | ||
226 | subs->freqm = subs->freqn; | ||
227 | /* calculate max. frequency */ | ||
228 | if (subs->maxpacksize) { | ||
229 | /* whatever fits into a max. size packet */ | ||
230 | maxsize = subs->maxpacksize; | ||
231 | subs->freqmax = (maxsize / (frame_bits >> 3)) | ||
232 | << (16 - subs->datainterval); | ||
233 | } else { | ||
234 | /* no max. packet size: just take 25% higher than nominal */ | ||
235 | subs->freqmax = subs->freqn + (subs->freqn >> 2); | ||
236 | maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) | ||
237 | >> (16 - subs->datainterval); | ||
238 | } | ||
239 | subs->phase = 0; | ||
240 | |||
241 | if (subs->fill_max) | ||
242 | subs->curpacksize = subs->maxpacksize; | ||
243 | else | ||
244 | subs->curpacksize = maxsize; | ||
245 | |||
246 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) | ||
247 | packs_per_ms = 8 >> subs->datainterval; | ||
248 | else | ||
249 | packs_per_ms = 1; | ||
250 | |||
251 | if (is_playback) { | ||
252 | urb_packs = max(chip->nrpacks, 1); | ||
253 | urb_packs = min(urb_packs, (unsigned int)MAX_PACKS); | ||
254 | } else | ||
255 | urb_packs = 1; | ||
256 | urb_packs *= packs_per_ms; | ||
257 | if (subs->syncpipe) | ||
258 | urb_packs = min(urb_packs, 1U << subs->syncinterval); | ||
259 | |||
260 | /* decide how many packets to be used */ | ||
261 | if (is_playback) { | ||
262 | unsigned int minsize, maxpacks; | ||
263 | /* determine how small a packet can be */ | ||
264 | minsize = (subs->freqn >> (16 - subs->datainterval)) | ||
265 | * (frame_bits >> 3); | ||
266 | /* with sync from device, assume it can be 12% lower */ | ||
267 | if (subs->syncpipe) | ||
268 | minsize -= minsize >> 3; | ||
269 | minsize = max(minsize, 1u); | ||
270 | total_packs = (period_bytes + minsize - 1) / minsize; | ||
271 | /* we need at least two URBs for queueing */ | ||
272 | if (total_packs < 2) { | ||
273 | total_packs = 2; | ||
274 | } else { | ||
275 | /* and we don't want too long a queue either */ | ||
276 | maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); | ||
277 | total_packs = min(total_packs, maxpacks); | ||
278 | } | ||
279 | } else { | ||
280 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) | ||
281 | urb_packs >>= 1; | ||
282 | total_packs = MAX_URBS * urb_packs; | ||
283 | } | ||
284 | subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; | ||
285 | if (subs->nurbs > MAX_URBS) { | ||
286 | /* too much... */ | ||
287 | subs->nurbs = MAX_URBS; | ||
288 | total_packs = MAX_URBS * urb_packs; | ||
289 | } else if (subs->nurbs < 2) { | ||
290 | /* too little - we need at least two packets | ||
291 | * to ensure contiguous playback/capture | ||
292 | */ | ||
293 | subs->nurbs = 2; | ||
294 | } | ||
295 | |||
296 | /* allocate and initialize data urbs */ | ||
297 | for (i = 0; i < subs->nurbs; i++) { | ||
298 | struct snd_urb_ctx *u = &subs->dataurb[i]; | ||
299 | u->index = i; | ||
300 | u->subs = subs; | ||
301 | u->packets = (i + 1) * total_packs / subs->nurbs | ||
302 | - i * total_packs / subs->nurbs; | ||
303 | u->buffer_size = maxsize * u->packets; | ||
304 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) | ||
305 | u->packets++; /* for transfer delimiter */ | ||
306 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); | ||
307 | if (!u->urb) | ||
308 | goto out_of_memory; | ||
309 | u->urb->transfer_buffer = | ||
310 | usb_buffer_alloc(subs->dev, u->buffer_size, GFP_KERNEL, | ||
311 | &u->urb->transfer_dma); | ||
312 | if (!u->urb->transfer_buffer) | ||
313 | goto out_of_memory; | ||
314 | u->urb->pipe = subs->datapipe; | ||
315 | u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | ||
316 | u->urb->interval = 1 << subs->datainterval; | ||
317 | u->urb->context = u; | ||
318 | u->urb->complete = snd_complete_urb; | ||
319 | } | ||
320 | |||
321 | if (subs->syncpipe) { | ||
322 | /* allocate and initialize sync urbs */ | ||
323 | subs->syncbuf = usb_buffer_alloc(subs->dev, SYNC_URBS * 4, | ||
324 | GFP_KERNEL, &subs->sync_dma); | ||
325 | if (!subs->syncbuf) | ||
326 | goto out_of_memory; | ||
327 | for (i = 0; i < SYNC_URBS; i++) { | ||
328 | struct snd_urb_ctx *u = &subs->syncurb[i]; | ||
329 | u->index = i; | ||
330 | u->subs = subs; | ||
331 | u->packets = 1; | ||
332 | u->urb = usb_alloc_urb(1, GFP_KERNEL); | ||
333 | if (!u->urb) | ||
334 | goto out_of_memory; | ||
335 | u->urb->transfer_buffer = subs->syncbuf + i * 4; | ||
336 | u->urb->transfer_dma = subs->sync_dma + i * 4; | ||
337 | u->urb->transfer_buffer_length = 4; | ||
338 | u->urb->pipe = subs->syncpipe; | ||
339 | u->urb->transfer_flags = URB_ISO_ASAP | | ||
340 | URB_NO_TRANSFER_DMA_MAP; | ||
341 | u->urb->number_of_packets = 1; | ||
342 | u->urb->interval = 1 << subs->syncinterval; | ||
343 | u->urb->context = u; | ||
344 | u->urb->complete = snd_complete_sync_urb; | ||
345 | } | ||
346 | } | ||
347 | return 0; | ||
348 | |||
349 | out_of_memory: | ||
350 | snd_usb_release_substream_urbs(subs, 0); | ||
351 | return -ENOMEM; | ||
352 | } | ||
353 | |||
354 | /* | ||
355 | * prepare urb for full speed capture sync pipe | ||
356 | * | ||
357 | * fill the length and offset of each urb descriptor. | ||
358 | * the fixed 10.14 frequency is passed through the pipe. | ||
359 | */ | ||
360 | static int prepare_capture_sync_urb(struct snd_usb_substream *subs, | ||
361 | struct snd_pcm_runtime *runtime, | ||
362 | struct urb *urb) | ||
363 | { | ||
364 | unsigned char *cp = urb->transfer_buffer; | ||
365 | struct snd_urb_ctx *ctx = urb->context; | ||
366 | |||
367 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | ||
368 | urb->iso_frame_desc[0].length = 3; | ||
369 | urb->iso_frame_desc[0].offset = 0; | ||
370 | cp[0] = subs->freqn >> 2; | ||
371 | cp[1] = subs->freqn >> 10; | ||
372 | cp[2] = subs->freqn >> 18; | ||
373 | return 0; | ||
374 | } | ||
375 | |||
376 | /* | ||
377 | * prepare urb for high speed capture sync pipe | ||
378 | * | ||
379 | * fill the length and offset of each urb descriptor. | ||
380 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. | ||
381 | */ | ||
382 | static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs, | ||
383 | struct snd_pcm_runtime *runtime, | ||
384 | struct urb *urb) | ||
385 | { | ||
386 | unsigned char *cp = urb->transfer_buffer; | ||
387 | struct snd_urb_ctx *ctx = urb->context; | ||
388 | |||
389 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | ||
390 | urb->iso_frame_desc[0].length = 4; | ||
391 | urb->iso_frame_desc[0].offset = 0; | ||
392 | cp[0] = subs->freqn; | ||
393 | cp[1] = subs->freqn >> 8; | ||
394 | cp[2] = subs->freqn >> 16; | ||
395 | cp[3] = subs->freqn >> 24; | ||
396 | return 0; | ||
397 | } | ||
398 | |||
399 | /* | ||
400 | * process after capture sync complete | ||
401 | * - nothing to do | ||
402 | */ | ||
403 | static int retire_capture_sync_urb(struct snd_usb_substream *subs, | ||
404 | struct snd_pcm_runtime *runtime, | ||
405 | struct urb *urb) | ||
406 | { | ||
407 | return 0; | ||
408 | } | ||
409 | |||
410 | /* | ||
411 | * prepare urb for capture data pipe | ||
412 | * | ||
413 | * fill the offset and length of each descriptor. | ||
414 | * | ||
415 | * we use a temporary buffer to write the captured data. | ||
416 | * since the length of written data is determined by host, we cannot | ||
417 | * write onto the pcm buffer directly... the data is thus copied | ||
418 | * later at complete callback to the global buffer. | ||
419 | */ | ||
420 | static int prepare_capture_urb(struct snd_usb_substream *subs, | ||
421 | struct snd_pcm_runtime *runtime, | ||
422 | struct urb *urb) | ||
423 | { | ||
424 | int i, offs; | ||
425 | struct snd_urb_ctx *ctx = urb->context; | ||
426 | |||
427 | offs = 0; | ||
428 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | ||
429 | for (i = 0; i < ctx->packets; i++) { | ||
430 | urb->iso_frame_desc[i].offset = offs; | ||
431 | urb->iso_frame_desc[i].length = subs->curpacksize; | ||
432 | offs += subs->curpacksize; | ||
433 | } | ||
434 | urb->transfer_buffer_length = offs; | ||
435 | urb->number_of_packets = ctx->packets; | ||
436 | return 0; | ||
437 | } | ||
438 | |||
439 | /* | ||
440 | * process after capture complete | ||
441 | * | ||
442 | * copy the data from each desctiptor to the pcm buffer, and | ||
443 | * update the current position. | ||
444 | */ | ||
445 | static int retire_capture_urb(struct snd_usb_substream *subs, | ||
446 | struct snd_pcm_runtime *runtime, | ||
447 | struct urb *urb) | ||
448 | { | ||
449 | unsigned long flags; | ||
450 | unsigned char *cp; | ||
451 | int i; | ||
452 | unsigned int stride, frames, bytes, oldptr; | ||
453 | int period_elapsed = 0; | ||
454 | |||
455 | stride = runtime->frame_bits >> 3; | ||
456 | |||
457 | for (i = 0; i < urb->number_of_packets; i++) { | ||
458 | cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; | ||
459 | if (urb->iso_frame_desc[i].status) { | ||
460 | snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status); | ||
461 | // continue; | ||
462 | } | ||
463 | bytes = urb->iso_frame_desc[i].actual_length; | ||
464 | frames = bytes / stride; | ||
465 | if (!subs->txfr_quirk) | ||
466 | bytes = frames * stride; | ||
467 | if (bytes % (runtime->sample_bits >> 3) != 0) { | ||
468 | #ifdef CONFIG_SND_DEBUG_VERBOSE | ||
469 | int oldbytes = bytes; | ||
470 | #endif | ||
471 | bytes = frames * stride; | ||
472 | snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", | ||
473 | oldbytes, bytes); | ||
474 | } | ||
475 | /* update the current pointer */ | ||
476 | spin_lock_irqsave(&subs->lock, flags); | ||
477 | oldptr = subs->hwptr_done; | ||
478 | subs->hwptr_done += bytes; | ||
479 | if (subs->hwptr_done >= runtime->buffer_size * stride) | ||
480 | subs->hwptr_done -= runtime->buffer_size * stride; | ||
481 | frames = (bytes + (oldptr % stride)) / stride; | ||
482 | subs->transfer_done += frames; | ||
483 | if (subs->transfer_done >= runtime->period_size) { | ||
484 | subs->transfer_done -= runtime->period_size; | ||
485 | period_elapsed = 1; | ||
486 | } | ||
487 | spin_unlock_irqrestore(&subs->lock, flags); | ||
488 | /* copy a data chunk */ | ||
489 | if (oldptr + bytes > runtime->buffer_size * stride) { | ||
490 | unsigned int bytes1 = | ||
491 | runtime->buffer_size * stride - oldptr; | ||
492 | memcpy(runtime->dma_area + oldptr, cp, bytes1); | ||
493 | memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); | ||
494 | } else { | ||
495 | memcpy(runtime->dma_area + oldptr, cp, bytes); | ||
496 | } | ||
497 | } | ||
498 | if (period_elapsed) | ||
499 | snd_pcm_period_elapsed(subs->pcm_substream); | ||
500 | return 0; | ||
501 | } | ||
502 | |||
503 | /* | ||
504 | * Process after capture complete when paused. Nothing to do. | ||
505 | */ | ||
506 | static int retire_paused_capture_urb(struct snd_usb_substream *subs, | ||
507 | struct snd_pcm_runtime *runtime, | ||
508 | struct urb *urb) | ||
509 | { | ||
510 | return 0; | ||
511 | } | ||
512 | |||
513 | |||
514 | /* | ||
515 | * prepare urb for full speed playback sync pipe | ||
516 | * | ||
517 | * set up the offset and length to receive the current frequency. | ||
518 | */ | ||
519 | |||
520 | static int prepare_playback_sync_urb(struct snd_usb_substream *subs, | ||
521 | struct snd_pcm_runtime *runtime, | ||
522 | struct urb *urb) | ||
523 | { | ||
524 | struct snd_urb_ctx *ctx = urb->context; | ||
525 | |||
526 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | ||
527 | urb->iso_frame_desc[0].length = 3; | ||
528 | urb->iso_frame_desc[0].offset = 0; | ||
529 | return 0; | ||
530 | } | ||
531 | |||
532 | /* | ||
533 | * prepare urb for high speed playback sync pipe | ||
534 | * | ||
535 | * set up the offset and length to receive the current frequency. | ||
536 | */ | ||
537 | |||
538 | static int prepare_playback_sync_urb_hs(struct snd_usb_substream *subs, | ||
539 | struct snd_pcm_runtime *runtime, | ||
540 | struct urb *urb) | ||
541 | { | ||
542 | struct snd_urb_ctx *ctx = urb->context; | ||
543 | |||
544 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | ||
545 | urb->iso_frame_desc[0].length = 4; | ||
546 | urb->iso_frame_desc[0].offset = 0; | ||
547 | return 0; | ||
548 | } | ||
549 | |||
550 | /* | ||
551 | * process after full speed playback sync complete | ||
552 | * | ||
553 | * retrieve the current 10.14 frequency from pipe, and set it. | ||
554 | * the value is referred in prepare_playback_urb(). | ||
555 | */ | ||
556 | static int retire_playback_sync_urb(struct snd_usb_substream *subs, | ||
557 | struct snd_pcm_runtime *runtime, | ||
558 | struct urb *urb) | ||
559 | { | ||
560 | unsigned int f; | ||
561 | unsigned long flags; | ||
562 | |||
563 | if (urb->iso_frame_desc[0].status == 0 && | ||
564 | urb->iso_frame_desc[0].actual_length == 3) { | ||
565 | f = combine_triple((u8*)urb->transfer_buffer) << 2; | ||
566 | if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { | ||
567 | spin_lock_irqsave(&subs->lock, flags); | ||
568 | subs->freqm = f; | ||
569 | spin_unlock_irqrestore(&subs->lock, flags); | ||
570 | } | ||
571 | } | ||
572 | |||
573 | return 0; | ||
574 | } | ||
575 | |||
576 | /* | ||
577 | * process after high speed playback sync complete | ||
578 | * | ||
579 | * retrieve the current 12.13 frequency from pipe, and set it. | ||
580 | * the value is referred in prepare_playback_urb(). | ||
581 | */ | ||
582 | static int retire_playback_sync_urb_hs(struct snd_usb_substream *subs, | ||
583 | struct snd_pcm_runtime *runtime, | ||
584 | struct urb *urb) | ||
585 | { | ||
586 | unsigned int f; | ||
587 | unsigned long flags; | ||
588 | |||
589 | if (urb->iso_frame_desc[0].status == 0 && | ||
590 | urb->iso_frame_desc[0].actual_length == 4) { | ||
591 | f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff; | ||
592 | if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { | ||
593 | spin_lock_irqsave(&subs->lock, flags); | ||
594 | subs->freqm = f; | ||
595 | spin_unlock_irqrestore(&subs->lock, flags); | ||
596 | } | ||
597 | } | ||
598 | |||
599 | return 0; | ||
600 | } | ||
601 | |||
602 | /* | ||
603 | * process after E-Mu 0202/0404/Tracker Pre high speed playback sync complete | ||
604 | * | ||
605 | * These devices return the number of samples per packet instead of the number | ||
606 | * of samples per microframe. | ||
607 | */ | ||
608 | static int retire_playback_sync_urb_hs_emu(struct snd_usb_substream *subs, | ||
609 | struct snd_pcm_runtime *runtime, | ||
610 | struct urb *urb) | ||
611 | { | ||
612 | unsigned int f; | ||
613 | unsigned long flags; | ||
614 | |||
615 | if (urb->iso_frame_desc[0].status == 0 && | ||
616 | urb->iso_frame_desc[0].actual_length == 4) { | ||
617 | f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff; | ||
618 | f >>= subs->datainterval; | ||
619 | if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { | ||
620 | spin_lock_irqsave(&subs->lock, flags); | ||
621 | subs->freqm = f; | ||
622 | spin_unlock_irqrestore(&subs->lock, flags); | ||
623 | } | ||
624 | } | ||
625 | |||
626 | return 0; | ||
627 | } | ||
628 | |||
629 | /* determine the number of frames in the next packet */ | ||
630 | static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs) | ||
631 | { | ||
632 | if (subs->fill_max) | ||
633 | return subs->maxframesize; | ||
634 | else { | ||
635 | subs->phase = (subs->phase & 0xffff) | ||
636 | + (subs->freqm << subs->datainterval); | ||
637 | return min(subs->phase >> 16, subs->maxframesize); | ||
638 | } | ||
639 | } | ||
640 | |||
641 | /* | ||
642 | * Prepare urb for streaming before playback starts or when paused. | ||
643 | * | ||
644 | * We don't have any data, so we send silence. | ||
645 | */ | ||
646 | static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, | ||
647 | struct snd_pcm_runtime *runtime, | ||
648 | struct urb *urb) | ||
649 | { | ||
650 | unsigned int i, offs, counts; | ||
651 | struct snd_urb_ctx *ctx = urb->context; | ||
652 | int stride = runtime->frame_bits >> 3; | ||
653 | |||
654 | offs = 0; | ||
655 | urb->dev = ctx->subs->dev; | ||
656 | for (i = 0; i < ctx->packets; ++i) { | ||
657 | counts = snd_usb_audio_next_packet_size(subs); | ||
658 | urb->iso_frame_desc[i].offset = offs * stride; | ||
659 | urb->iso_frame_desc[i].length = counts * stride; | ||
660 | offs += counts; | ||
661 | } | ||
662 | urb->number_of_packets = ctx->packets; | ||
663 | urb->transfer_buffer_length = offs * stride; | ||
664 | memset(urb->transfer_buffer, | ||
665 | subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, | ||
666 | offs * stride); | ||
667 | return 0; | ||
668 | } | ||
669 | |||
670 | /* | ||
671 | * prepare urb for playback data pipe | ||
672 | * | ||
673 | * Since a URB can handle only a single linear buffer, we must use double | ||
674 | * buffering when the data to be transferred overflows the buffer boundary. | ||
675 | * To avoid inconsistencies when updating hwptr_done, we use double buffering | ||
676 | * for all URBs. | ||
677 | */ | ||
678 | static int prepare_playback_urb(struct snd_usb_substream *subs, | ||
679 | struct snd_pcm_runtime *runtime, | ||
680 | struct urb *urb) | ||
681 | { | ||
682 | int i, stride; | ||
683 | unsigned int counts, frames, bytes; | ||
684 | unsigned long flags; | ||
685 | int period_elapsed = 0; | ||
686 | struct snd_urb_ctx *ctx = urb->context; | ||
687 | |||
688 | stride = runtime->frame_bits >> 3; | ||
689 | |||
690 | frames = 0; | ||
691 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ | ||
692 | urb->number_of_packets = 0; | ||
693 | spin_lock_irqsave(&subs->lock, flags); | ||
694 | for (i = 0; i < ctx->packets; i++) { | ||
695 | counts = snd_usb_audio_next_packet_size(subs); | ||
696 | /* set up descriptor */ | ||
697 | urb->iso_frame_desc[i].offset = frames * stride; | ||
698 | urb->iso_frame_desc[i].length = counts * stride; | ||
699 | frames += counts; | ||
700 | urb->number_of_packets++; | ||
701 | subs->transfer_done += counts; | ||
702 | if (subs->transfer_done >= runtime->period_size) { | ||
703 | subs->transfer_done -= runtime->period_size; | ||
704 | period_elapsed = 1; | ||
705 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) { | ||
706 | if (subs->transfer_done > 0) { | ||
707 | /* FIXME: fill-max mode is not | ||
708 | * supported yet */ | ||
709 | frames -= subs->transfer_done; | ||
710 | counts -= subs->transfer_done; | ||
711 | urb->iso_frame_desc[i].length = | ||
712 | counts * stride; | ||
713 | subs->transfer_done = 0; | ||
714 | } | ||
715 | i++; | ||
716 | if (i < ctx->packets) { | ||
717 | /* add a transfer delimiter */ | ||
718 | urb->iso_frame_desc[i].offset = | ||
719 | frames * stride; | ||
720 | urb->iso_frame_desc[i].length = 0; | ||
721 | urb->number_of_packets++; | ||
722 | } | ||
723 | break; | ||
724 | } | ||
725 | } | ||
726 | if (period_elapsed) /* finish at the period boundary */ | ||
727 | break; | ||
728 | } | ||
729 | bytes = frames * stride; | ||
730 | if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { | ||
731 | /* err, the transferred area goes over buffer boundary. */ | ||
732 | unsigned int bytes1 = | ||
733 | runtime->buffer_size * stride - subs->hwptr_done; | ||
734 | memcpy(urb->transfer_buffer, | ||
735 | runtime->dma_area + subs->hwptr_done, bytes1); | ||
736 | memcpy(urb->transfer_buffer + bytes1, | ||
737 | runtime->dma_area, bytes - bytes1); | ||
738 | } else { | ||
739 | memcpy(urb->transfer_buffer, | ||
740 | runtime->dma_area + subs->hwptr_done, bytes); | ||
741 | } | ||
742 | subs->hwptr_done += bytes; | ||
743 | if (subs->hwptr_done >= runtime->buffer_size * stride) | ||
744 | subs->hwptr_done -= runtime->buffer_size * stride; | ||
745 | runtime->delay += frames; | ||
746 | spin_unlock_irqrestore(&subs->lock, flags); | ||
747 | urb->transfer_buffer_length = bytes; | ||
748 | if (period_elapsed) | ||
749 | snd_pcm_period_elapsed(subs->pcm_substream); | ||
750 | return 0; | ||
751 | } | ||
752 | |||
753 | /* | ||
754 | * process after playback data complete | ||
755 | * - decrease the delay count again | ||
756 | */ | ||
757 | static int retire_playback_urb(struct snd_usb_substream *subs, | ||
758 | struct snd_pcm_runtime *runtime, | ||
759 | struct urb *urb) | ||
760 | { | ||
761 | unsigned long flags; | ||
762 | int stride = runtime->frame_bits >> 3; | ||
763 | int processed = urb->transfer_buffer_length / stride; | ||
764 | |||
765 | spin_lock_irqsave(&subs->lock, flags); | ||
766 | if (processed > runtime->delay) | ||
767 | runtime->delay = 0; | ||
768 | else | ||
769 | runtime->delay -= processed; | ||
770 | spin_unlock_irqrestore(&subs->lock, flags); | ||
771 | return 0; | ||
772 | } | ||
773 | |||
774 | static const char *usb_error_string(int err) | ||
775 | { | ||
776 | switch (err) { | ||
777 | case -ENODEV: | ||
778 | return "no device"; | ||
779 | case -ENOENT: | ||
780 | return "endpoint not enabled"; | ||
781 | case -EPIPE: | ||
782 | return "endpoint stalled"; | ||
783 | case -ENOSPC: | ||
784 | return "not enough bandwidth"; | ||
785 | case -ESHUTDOWN: | ||
786 | return "device disabled"; | ||
787 | case -EHOSTUNREACH: | ||
788 | return "device suspended"; | ||
789 | case -EINVAL: | ||
790 | case -EAGAIN: | ||
791 | case -EFBIG: | ||
792 | case -EMSGSIZE: | ||
793 | return "internal error"; | ||
794 | default: | ||
795 | return "unknown error"; | ||
796 | } | ||
797 | } | ||
798 | |||
799 | /* | ||
800 | * set up and start data/sync urbs | ||
801 | */ | ||
802 | static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime) | ||
803 | { | ||
804 | unsigned int i; | ||
805 | int err; | ||
806 | |||
807 | if (subs->stream->chip->shutdown) | ||
808 | return -EBADFD; | ||
809 | |||
810 | for (i = 0; i < subs->nurbs; i++) { | ||
811 | if (snd_BUG_ON(!subs->dataurb[i].urb)) | ||
812 | return -EINVAL; | ||
813 | if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) { | ||
814 | snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i); | ||
815 | goto __error; | ||
816 | } | ||
817 | } | ||
818 | if (subs->syncpipe) { | ||
819 | for (i = 0; i < SYNC_URBS; i++) { | ||
820 | if (snd_BUG_ON(!subs->syncurb[i].urb)) | ||
821 | return -EINVAL; | ||
822 | if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) { | ||
823 | snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i); | ||
824 | goto __error; | ||
825 | } | ||
826 | } | ||
827 | } | ||
828 | |||
829 | subs->active_mask = 0; | ||
830 | subs->unlink_mask = 0; | ||
831 | subs->running = 1; | ||
832 | for (i = 0; i < subs->nurbs; i++) { | ||
833 | err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC); | ||
834 | if (err < 0) { | ||
835 | snd_printk(KERN_ERR "cannot submit datapipe " | ||
836 | "for urb %d, error %d: %s\n", | ||
837 | i, err, usb_error_string(err)); | ||
838 | goto __error; | ||
839 | } | ||
840 | set_bit(i, &subs->active_mask); | ||
841 | } | ||
842 | if (subs->syncpipe) { | ||
843 | for (i = 0; i < SYNC_URBS; i++) { | ||
844 | err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC); | ||
845 | if (err < 0) { | ||
846 | snd_printk(KERN_ERR "cannot submit syncpipe " | ||
847 | "for urb %d, error %d: %s\n", | ||
848 | i, err, usb_error_string(err)); | ||
849 | goto __error; | ||
850 | } | ||
851 | set_bit(i + 16, &subs->active_mask); | ||
852 | } | ||
853 | } | ||
854 | return 0; | ||
855 | |||
856 | __error: | ||
857 | // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN); | ||
858 | deactivate_urbs(subs, 0, 0); | ||
859 | return -EPIPE; | ||
860 | } | ||
861 | |||
862 | |||
863 | /* | ||
864 | */ | ||
865 | static struct snd_urb_ops audio_urb_ops[2] = { | ||
866 | { | ||
867 | .prepare = prepare_nodata_playback_urb, | ||
868 | .retire = retire_playback_urb, | ||
869 | .prepare_sync = prepare_playback_sync_urb, | ||
870 | .retire_sync = retire_playback_sync_urb, | ||
871 | }, | ||
872 | { | ||
873 | .prepare = prepare_capture_urb, | ||
874 | .retire = retire_capture_urb, | ||
875 | .prepare_sync = prepare_capture_sync_urb, | ||
876 | .retire_sync = retire_capture_sync_urb, | ||
877 | }, | ||
878 | }; | ||
879 | |||
880 | static struct snd_urb_ops audio_urb_ops_high_speed[2] = { | ||
881 | { | ||
882 | .prepare = prepare_nodata_playback_urb, | ||
883 | .retire = retire_playback_urb, | ||
884 | .prepare_sync = prepare_playback_sync_urb_hs, | ||
885 | .retire_sync = retire_playback_sync_urb_hs, | ||
886 | }, | ||
887 | { | ||
888 | .prepare = prepare_capture_urb, | ||
889 | .retire = retire_capture_urb, | ||
890 | .prepare_sync = prepare_capture_sync_urb_hs, | ||
891 | .retire_sync = retire_capture_sync_urb, | ||
892 | }, | ||
893 | }; | ||
894 | |||
895 | /* | ||
896 | * initialize the substream instance. | ||
897 | */ | ||
898 | |||
899 | void snd_usb_init_substream(struct snd_usb_stream *as, | ||
900 | int stream, struct audioformat *fp) | ||
901 | { | ||
902 | struct snd_usb_substream *subs = &as->substream[stream]; | ||
903 | |||
904 | INIT_LIST_HEAD(&subs->fmt_list); | ||
905 | spin_lock_init(&subs->lock); | ||
906 | |||
907 | subs->stream = as; | ||
908 | subs->direction = stream; | ||
909 | subs->dev = as->chip->dev; | ||
910 | subs->txfr_quirk = as->chip->txfr_quirk; | ||
911 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) { | ||
912 | subs->ops = audio_urb_ops[stream]; | ||
913 | } else { | ||
914 | subs->ops = audio_urb_ops_high_speed[stream]; | ||
915 | switch (as->chip->usb_id) { | ||
916 | case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */ | ||
917 | case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */ | ||
918 | case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */ | ||
919 | subs->ops.retire_sync = retire_playback_sync_urb_hs_emu; | ||
920 | break; | ||
921 | } | ||
922 | } | ||
923 | |||
924 | snd_usb_set_pcm_ops(as->pcm, stream); | ||
925 | |||
926 | list_add_tail(&fp->list, &subs->fmt_list); | ||
927 | subs->formats |= 1ULL << fp->format; | ||
928 | subs->endpoint = fp->endpoint; | ||
929 | subs->num_formats++; | ||
930 | subs->fmt_type = fp->fmt_type; | ||
931 | } | ||
932 | |||
933 | int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd) | ||
934 | { | ||
935 | struct snd_usb_substream *subs = substream->runtime->private_data; | ||
936 | |||
937 | switch (cmd) { | ||
938 | case SNDRV_PCM_TRIGGER_START: | ||
939 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | ||
940 | subs->ops.prepare = prepare_playback_urb; | ||
941 | return 0; | ||
942 | case SNDRV_PCM_TRIGGER_STOP: | ||
943 | return deactivate_urbs(subs, 0, 0); | ||
944 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | ||
945 | subs->ops.prepare = prepare_nodata_playback_urb; | ||
946 | return 0; | ||
947 | } | ||
948 | |||
949 | return -EINVAL; | ||
950 | } | ||
951 | |||
952 | int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd) | ||
953 | { | ||
954 | struct snd_usb_substream *subs = substream->runtime->private_data; | ||
955 | |||
956 | switch (cmd) { | ||
957 | case SNDRV_PCM_TRIGGER_START: | ||
958 | subs->ops.retire = retire_capture_urb; | ||
959 | return start_urbs(subs, substream->runtime); | ||
960 | case SNDRV_PCM_TRIGGER_STOP: | ||
961 | return deactivate_urbs(subs, 0, 0); | ||
962 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | ||
963 | subs->ops.retire = retire_paused_capture_urb; | ||
964 | return 0; | ||
965 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | ||
966 | subs->ops.retire = retire_capture_urb; | ||
967 | return 0; | ||
968 | } | ||
969 | |||
970 | return -EINVAL; | ||
971 | } | ||
972 | |||
973 | int snd_usb_substream_prepare(struct snd_usb_substream *subs, | ||
974 | struct snd_pcm_runtime *runtime) | ||
975 | { | ||
976 | /* clear urbs (to be sure) */ | ||
977 | deactivate_urbs(subs, 0, 1); | ||
978 | wait_clear_urbs(subs); | ||
979 | |||
980 | /* for playback, submit the URBs now; otherwise, the first hwptr_done | ||
981 | * updates for all URBs would happen at the same time when starting */ | ||
982 | if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { | ||
983 | subs->ops.prepare = prepare_nodata_playback_urb; | ||
984 | return start_urbs(subs, runtime); | ||
985 | } | ||
986 | |||
987 | return 0; | ||
988 | } | ||
989 | |||