blob: 08dcce53720bad66499f48709c553b04e6ea6821 [file] [log] [blame]
Daniel Macke5779992010-03-04 19:46:13 +01001/*
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
Daniel Mackc731bc92011-09-14 12:46:57 +020018#include <linux/gfp.h>
19#include <linux/init.h>
Takashi Iwai80c8a2a2012-01-09 11:37:20 +010020#include <linux/ratelimit.h>
Daniel Mackc731bc92011-09-14 12:46:57 +020021#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 */
37static 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 */
46static 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 */
54static 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 */
101static 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 */
116static 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 */
146void 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 */
167static 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 */
190static 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 */
213int 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
352out_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 */
363static 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 */
385static 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 */
406static 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 */
423static 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 */
448static 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;
Takashi Iwai80c8a2a2012-01-09 11:37:20 +0100462 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
463 snd_printdd("frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
Daniel Mackc731bc92011-09-14 12:46:57 +0200464 // 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 */
509static 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 */
522static 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 */
544static 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 */
607static 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 */
623static 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 */
655static 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 */
743static 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
775static 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 */
803static 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 */
866static 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
885void 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
910int 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
929int 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
950int 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