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This client driver allows you to use a GPIO pin as a source for PPS
[linux-2.6/next.git] / sound / usb / caiaq / audio.c
blob2cf87f5afed4e2fbc93cdcdf4d72277b8afae52f
1 /*
2 * Copyright (c) 2006-2008 Daniel Mack, Karsten Wiese
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #include <linux/spinlock.h>
20 #include <linux/slab.h>
21 #include <linux/init.h>
22 #include <linux/usb.h>
23 #include <sound/core.h>
24 #include <sound/pcm.h>
25
26 #include "device.h"
27 #include "audio.h"
28
29 #define N_URBS 32
30 #define CLOCK_DRIFT_TOLERANCE 5
31 #define FRAMES_PER_URB 8
32 #define BYTES_PER_FRAME 512
33 #define CHANNELS_PER_STREAM 2
34 #define BYTES_PER_SAMPLE 3
35 #define BYTES_PER_SAMPLE_USB 4
36 #define MAX_BUFFER_SIZE (128*1024)
37 #define MAX_ENDPOINT_SIZE 512
38
39 #define ENDPOINT_CAPTURE 2
40 #define ENDPOINT_PLAYBACK 6
41
42 #define MAKE_CHECKBYTE(dev,stream,i) \
43 (stream << 1) | (~(i / (dev->n_streams * BYTES_PER_SAMPLE_USB)) & 1)
44
45 static struct snd_pcm_hardware snd_usb_caiaq_pcm_hardware = {
46 .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
47 SNDRV_PCM_INFO_BLOCK_TRANSFER),
48 .formats = SNDRV_PCM_FMTBIT_S24_3BE,
49 .rates = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
50 SNDRV_PCM_RATE_96000),
51 .rate_min = 44100,
52 .rate_max = 0, /* will overwrite later */
53 .channels_min = CHANNELS_PER_STREAM,
54 .channels_max = CHANNELS_PER_STREAM,
55 .buffer_bytes_max = MAX_BUFFER_SIZE,
56 .period_bytes_min = 128,
57 .period_bytes_max = MAX_BUFFER_SIZE,
58 .periods_min = 1,
59 .periods_max = 1024,
60 };
61
62 static void
63 activate_substream(struct snd_usb_caiaqdev *dev,
64 struct snd_pcm_substream *sub)
65 {
66 spin_lock(&dev->spinlock);
67
68 if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
69 dev->sub_playback[sub->number] = sub;
70 else
71 dev->sub_capture[sub->number] = sub;
72
73 spin_unlock(&dev->spinlock);
74 }
75
76 static void
77 deactivate_substream(struct snd_usb_caiaqdev *dev,
78 struct snd_pcm_substream *sub)
79 {
80 unsigned long flags;
81 spin_lock_irqsave(&dev->spinlock, flags);
82
83 if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
84 dev->sub_playback[sub->number] = NULL;
85 else
86 dev->sub_capture[sub->number] = NULL;
87
88 spin_unlock_irqrestore(&dev->spinlock, flags);
89 }
90
91 static int
92 all_substreams_zero(struct snd_pcm_substream **subs)
93 {
94 int i;
95 for (i = 0; i < MAX_STREAMS; i++)
96 if (subs[i] != NULL)
97 return 0;
98 return 1;
99 }
100
101 static int stream_start(struct snd_usb_caiaqdev *dev)
102 {
103 int i, ret;
104
105 debug("%s(%p)\n", __func__, dev);
106
107 if (dev->streaming)
108 return -EINVAL;
109
110 memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
111 memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
112 dev->input_panic = 0;
113 dev->output_panic = 0;
114 dev->first_packet = 4;
115 dev->streaming = 1;
116 dev->warned = 0;
117
118 for (i = 0; i < N_URBS; i++) {
119 ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);
120 if (ret) {
121 log("unable to trigger read #%d! (ret %d)\n", i, ret);
122 dev->streaming = 0;
123 return -EPIPE;
124 }
125 }
126
127 return 0;
128 }
129
130 static void stream_stop(struct snd_usb_caiaqdev *dev)
131 {
132 int i;
133
134 debug("%s(%p)\n", __func__, dev);
135 if (!dev->streaming)
136 return;
137
138 dev->streaming = 0;
139
140 for (i = 0; i < N_URBS; i++) {
141 usb_kill_urb(dev->data_urbs_in[i]);
142
143 if (test_bit(i, &dev->outurb_active_mask))
144 usb_kill_urb(dev->data_urbs_out[i]);
145 }
146
147 dev->outurb_active_mask = 0;
148 }
149
150 static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
151 {
152 struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
153 debug("%s(%p)\n", __func__, substream);
154 substream->runtime->hw = dev->pcm_info;
155 snd_pcm_limit_hw_rates(substream->runtime);
156 return 0;
157 }
158
159 static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
160 {
161 struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
162
163 debug("%s(%p)\n", __func__, substream);
164 if (all_substreams_zero(dev->sub_playback) &&
165 all_substreams_zero(dev->sub_capture)) {
166 /* when the last client has stopped streaming,
167 * all sample rates are allowed again */
168 stream_stop(dev);
169 dev->pcm_info.rates = dev->samplerates;
170 }
171
172 return 0;
173 }
174
175 static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
176 struct snd_pcm_hw_params *hw_params)
177 {
178 debug("%s(%p)\n", __func__, sub);
179 return snd_pcm_lib_malloc_pages(sub, params_buffer_bytes(hw_params));
180 }
181
182 static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
183 {
184 struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
185 debug("%s(%p)\n", __func__, sub);
186 deactivate_substream(dev, sub);
187 return snd_pcm_lib_free_pages(sub);
188 }
189
190 /* this should probably go upstream */
191 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
192 #error "Change this table"
193 #endif
194
195 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
196 48000, 64000, 88200, 96000, 176400, 192000 };
197
198 static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
199 {
200 int bytes_per_sample, bpp, ret, i;
201 int index = substream->number;
202 struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
203 struct snd_pcm_runtime *runtime = substream->runtime;
204
205 debug("%s(%p)\n", __func__, substream);
206
207 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
208 int out_pos;
209
210 switch (dev->spec.data_alignment) {
211 case 0:
212 case 2:
213 out_pos = BYTES_PER_SAMPLE + 1;
214 break;
215 case 3:
216 default:
217 out_pos = 0;
218 break;
219 }
220
221 dev->period_out_count[index] = out_pos;
222 dev->audio_out_buf_pos[index] = out_pos;
223 } else {
224 int in_pos;
225
226 switch (dev->spec.data_alignment) {
227 case 0:
228 in_pos = BYTES_PER_SAMPLE + 2;
229 break;
230 case 2:
231 in_pos = BYTES_PER_SAMPLE;
232 break;
233 case 3:
234 default:
235 in_pos = 0;
236 break;
237 }
238
239 dev->period_in_count[index] = in_pos;
240 dev->audio_in_buf_pos[index] = in_pos;
241 }
242
243 if (dev->streaming)
244 return 0;
245
246 /* the first client that opens a stream defines the sample rate
247 * setting for all subsequent calls, until the last client closed. */
248 for (i=0; i < ARRAY_SIZE(rates); i++)
249 if (runtime->rate == rates[i])
250 dev->pcm_info.rates = 1 << i;
251
252 snd_pcm_limit_hw_rates(runtime);
253
254 bytes_per_sample = BYTES_PER_SAMPLE;
255 if (dev->spec.data_alignment >= 2)
256 bytes_per_sample++;
257
258 bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
259 * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;
260
261 if (bpp > MAX_ENDPOINT_SIZE)
262 bpp = MAX_ENDPOINT_SIZE;
263
264 ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
265 runtime->sample_bits, bpp);
266 if (ret)
267 return ret;
268
269 ret = stream_start(dev);
270 if (ret)
271 return ret;
272
273 dev->output_running = 0;
274 wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);
275 if (!dev->output_running) {
276 stream_stop(dev);
277 return -EPIPE;
278 }
279
280 return 0;
281 }
282
283 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
284 {
285 struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
286
287 debug("%s(%p) cmd %d\n", __func__, sub, cmd);
288
289 switch (cmd) {
290 case SNDRV_PCM_TRIGGER_START:
291 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
292 activate_substream(dev, sub);
293 break;
294 case SNDRV_PCM_TRIGGER_STOP:
295 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
296 deactivate_substream(dev, sub);
297 break;
298 default:
299 return -EINVAL;
300 }
301
302 return 0;
303 }
304
305 static snd_pcm_uframes_t
306 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
307 {
308 int index = sub->number;
309 struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
310 snd_pcm_uframes_t ptr;
311
312 spin_lock(&dev->spinlock);
313
314 if (dev->input_panic || dev->output_panic)
315 ptr = SNDRV_PCM_POS_XRUN;
316
317 if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
318 ptr = bytes_to_frames(sub->runtime,
319 dev->audio_out_buf_pos[index]);
320 else
321 ptr = bytes_to_frames(sub->runtime,
322 dev->audio_in_buf_pos[index]);
323
324 spin_unlock(&dev->spinlock);
325 return ptr;
326 }
327
328 /* operators for both playback and capture */
329 static struct snd_pcm_ops snd_usb_caiaq_ops = {
330 .open = snd_usb_caiaq_substream_open,
331 .close = snd_usb_caiaq_substream_close,
332 .ioctl = snd_pcm_lib_ioctl,
333 .hw_params = snd_usb_caiaq_pcm_hw_params,
334 .hw_free = snd_usb_caiaq_pcm_hw_free,
335 .prepare = snd_usb_caiaq_pcm_prepare,
336 .trigger = snd_usb_caiaq_pcm_trigger,
337 .pointer = snd_usb_caiaq_pcm_pointer
338 };
339
340 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,
341 struct snd_pcm_substream **subs)
342 {
343 int stream, pb, *cnt;
344 struct snd_pcm_substream *sub;
345
346 for (stream = 0; stream < dev->n_streams; stream++) {
347 sub = subs[stream];
348 if (!sub)
349 continue;
350
351 pb = snd_pcm_lib_period_bytes(sub);
352 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
353 &dev->period_out_count[stream] :
354 &dev->period_in_count[stream];
355
356 if (*cnt >= pb) {
357 snd_pcm_period_elapsed(sub);
358 *cnt %= pb;
359 }
360 }
361 }
362
363 static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
364 const struct urb *urb,
365 const struct usb_iso_packet_descriptor *iso)
366 {
367 unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
368 struct snd_pcm_substream *sub;
369 int stream, i;
370
371 if (all_substreams_zero(dev->sub_capture))
372 return;
373
374 for (i = 0; i < iso->actual_length;) {
375 for (stream = 0; stream < dev->n_streams; stream++, i++) {
376 sub = dev->sub_capture[stream];
377 if (sub) {
378 struct snd_pcm_runtime *rt = sub->runtime;
379 char *audio_buf = rt->dma_area;
380 int sz = frames_to_bytes(rt, rt->buffer_size);
381 audio_buf[dev->audio_in_buf_pos[stream]++]
382 = usb_buf[i];
383 dev->period_in_count[stream]++;
384 if (dev->audio_in_buf_pos[stream] == sz)
385 dev->audio_in_buf_pos[stream] = 0;
386 }
387 }
388 }
389 }
390
391 static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
392 const struct urb *urb,
393 const struct usb_iso_packet_descriptor *iso)
394 {
395 unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
396 unsigned char check_byte;
397 struct snd_pcm_substream *sub;
398 int stream, i;
399
400 for (i = 0; i < iso->actual_length;) {
401 if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
402 for (stream = 0;
403 stream < dev->n_streams;
404 stream++, i++) {
405 if (dev->first_packet)
406 continue;
407
408 check_byte = MAKE_CHECKBYTE(dev, stream, i);
409
410 if ((usb_buf[i] & 0x3f) != check_byte)
411 dev->input_panic = 1;
412
413 if (usb_buf[i] & 0x80)
414 dev->output_panic = 1;
415 }
416 }
417 dev->first_packet = 0;
418
419 for (stream = 0; stream < dev->n_streams; stream++, i++) {
420 sub = dev->sub_capture[stream];
421 if (dev->input_panic)
422 usb_buf[i] = 0;
423
424 if (sub) {
425 struct snd_pcm_runtime *rt = sub->runtime;
426 char *audio_buf = rt->dma_area;
427 int sz = frames_to_bytes(rt, rt->buffer_size);
428 audio_buf[dev->audio_in_buf_pos[stream]++] =
429 usb_buf[i];
430 dev->period_in_count[stream]++;
431 if (dev->audio_in_buf_pos[stream] == sz)
432 dev->audio_in_buf_pos[stream] = 0;
433 }
434 }
435 }
436 }
437
438 static void read_in_urb_mode3(struct snd_usb_caiaqdev *dev,
439 const struct urb *urb,
440 const struct usb_iso_packet_descriptor *iso)
441 {
442 unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
443 int stream, i;
444
445 /* paranoia check */
446 if (iso->actual_length % (BYTES_PER_SAMPLE_USB * CHANNELS_PER_STREAM))
447 return;
448
449 for (i = 0; i < iso->actual_length;) {
450 for (stream = 0; stream < dev->n_streams; stream++) {
451 struct snd_pcm_substream *sub = dev->sub_capture[stream];
452 char *audio_buf = NULL;
453 int c, n, sz = 0;
454
455 if (sub && !dev->input_panic) {
456 struct snd_pcm_runtime *rt = sub->runtime;
457 audio_buf = rt->dma_area;
458 sz = frames_to_bytes(rt, rt->buffer_size);
459 }
460
461 for (c = 0; c < CHANNELS_PER_STREAM; c++) {
462 /* 3 audio data bytes, followed by 1 check byte */
463 if (audio_buf) {
464 for (n = 0; n < BYTES_PER_SAMPLE; n++) {
465 audio_buf[dev->audio_in_buf_pos[stream]++] = usb_buf[i+n];
466
467 if (dev->audio_in_buf_pos[stream] == sz)
468 dev->audio_in_buf_pos[stream] = 0;
469 }
470
471 dev->period_in_count[stream] += BYTES_PER_SAMPLE;
472 }
473
474 i += BYTES_PER_SAMPLE;
475
476 if (usb_buf[i] != ((stream << 1) | c) &&
477 !dev->first_packet) {
478 if (!dev->input_panic)
479 printk(" EXPECTED: %02x got %02x, c %d, stream %d, i %d\n",
480 ((stream << 1) | c), usb_buf[i], c, stream, i);
481 dev->input_panic = 1;
482 }
483
484 i++;
485 }
486 }
487 }
488
489 if (dev->first_packet > 0)
490 dev->first_packet--;
491 }
492
493 static void read_in_urb(struct snd_usb_caiaqdev *dev,
494 const struct urb *urb,
495 const struct usb_iso_packet_descriptor *iso)
496 {
497 if (!dev->streaming)
498 return;
499
500 if (iso->actual_length < dev->bpp)
501 return;
502
503 switch (dev->spec.data_alignment) {
504 case 0:
505 read_in_urb_mode0(dev, urb, iso);
506 break;
507 case 2:
508 read_in_urb_mode2(dev, urb, iso);
509 break;
510 case 3:
511 read_in_urb_mode3(dev, urb, iso);
512 break;
513 }
514
515 if ((dev->input_panic || dev->output_panic) && !dev->warned) {
516 debug("streaming error detected %s %s\n",
517 dev->input_panic ? "(input)" : "",
518 dev->output_panic ? "(output)" : "");
519 dev->warned = 1;
520 }
521 }
522
523 static void fill_out_urb_mode_0(struct snd_usb_caiaqdev *dev,
524 struct urb *urb,
525 const struct usb_iso_packet_descriptor *iso)
526 {
527 unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
528 struct snd_pcm_substream *sub;
529 int stream, i;
530
531 for (i = 0; i < iso->length;) {
532 for (stream = 0; stream < dev->n_streams; stream++, i++) {
533 sub = dev->sub_playback[stream];
534 if (sub) {
535 struct snd_pcm_runtime *rt = sub->runtime;
536 char *audio_buf = rt->dma_area;
537 int sz = frames_to_bytes(rt, rt->buffer_size);
538 usb_buf[i] =
539 audio_buf[dev->audio_out_buf_pos[stream]];
540 dev->period_out_count[stream]++;
541 dev->audio_out_buf_pos[stream]++;
542 if (dev->audio_out_buf_pos[stream] == sz)
543 dev->audio_out_buf_pos[stream] = 0;
544 } else
545 usb_buf[i] = 0;
546 }
547
548 /* fill in the check bytes */
549 if (dev->spec.data_alignment == 2 &&
550 i % (dev->n_streams * BYTES_PER_SAMPLE_USB) ==
551 (dev->n_streams * CHANNELS_PER_STREAM))
552 for (stream = 0; stream < dev->n_streams; stream++, i++)
553 usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
554 }
555 }
556
557 static void fill_out_urb_mode_3(struct snd_usb_caiaqdev *dev,
558 struct urb *urb,
559 const struct usb_iso_packet_descriptor *iso)
560 {
561 unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
562 int stream, i;
563
564 for (i = 0; i < iso->length;) {
565 for (stream = 0; stream < dev->n_streams; stream++) {
566 struct snd_pcm_substream *sub = dev->sub_playback[stream];
567 char *audio_buf = NULL;
568 int c, n, sz = 0;
569
570 if (sub) {
571 struct snd_pcm_runtime *rt = sub->runtime;
572 audio_buf = rt->dma_area;
573 sz = frames_to_bytes(rt, rt->buffer_size);
574 }
575
576 for (c = 0; c < CHANNELS_PER_STREAM; c++) {
577 for (n = 0; n < BYTES_PER_SAMPLE; n++) {
578 if (audio_buf) {
579 usb_buf[i+n] = audio_buf[dev->audio_out_buf_pos[stream]++];
580
581 if (dev->audio_out_buf_pos[stream] == sz)
582 dev->audio_out_buf_pos[stream] = 0;
583 } else {
584 usb_buf[i+n] = 0;
585 }
586 }
587
588 if (audio_buf)
589 dev->period_out_count[stream] += BYTES_PER_SAMPLE;
590
591 i += BYTES_PER_SAMPLE;
592
593 /* fill in the check byte pattern */
594 usb_buf[i++] = (stream << 1) | c;
595 }
596 }
597 }
598 }
599
600 static inline void fill_out_urb(struct snd_usb_caiaqdev *dev,
601 struct urb *urb,
602 const struct usb_iso_packet_descriptor *iso)
603 {
604 switch (dev->spec.data_alignment) {
605 case 0:
606 case 2:
607 fill_out_urb_mode_0(dev, urb, iso);
608 break;
609 case 3:
610 fill_out_urb_mode_3(dev, urb, iso);
611 break;
612 }
613 }
614
615 static void read_completed(struct urb *urb)
616 {
617 struct snd_usb_caiaq_cb_info *info = urb->context;
618 struct snd_usb_caiaqdev *dev;
619 struct urb *out = NULL;
620 int i, frame, len, send_it = 0, outframe = 0;
621 size_t offset = 0;
622
623 if (urb->status || !info)
624 return;
625
626 dev = info->dev;
627
628 if (!dev->streaming)
629 return;
630
631 /* find an unused output urb that is unused */
632 for (i = 0; i < N_URBS; i++)
633 if (test_and_set_bit(i, &dev->outurb_active_mask) == 0) {
634 out = dev->data_urbs_out[i];
635 break;
636 }
637
638 if (!out) {
639 log("Unable to find an output urb to use\n");
640 goto requeue;
641 }
642
643 /* read the recently received packet and send back one which has
644 * the same layout */
645 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
646 if (urb->iso_frame_desc[frame].status)
647 continue;
648
649 len = urb->iso_frame_desc[outframe].actual_length;
650 out->iso_frame_desc[outframe].length = len;
651 out->iso_frame_desc[outframe].actual_length = 0;
652 out->iso_frame_desc[outframe].offset = offset;
653 offset += len;
654
655 if (len > 0) {
656 spin_lock(&dev->spinlock);
657 fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
658 read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
659 spin_unlock(&dev->spinlock);
660 check_for_elapsed_periods(dev, dev->sub_playback);
661 check_for_elapsed_periods(dev, dev->sub_capture);
662 send_it = 1;
663 }
664
665 outframe++;
666 }
667
668 if (send_it) {
669 out->number_of_packets = outframe;
670 out->transfer_flags = URB_ISO_ASAP;
671 usb_submit_urb(out, GFP_ATOMIC);
672 } else {
673 struct snd_usb_caiaq_cb_info *oinfo = out->context;
674 clear_bit(oinfo->index, &dev->outurb_active_mask);
675 }
676
677 requeue:
678 /* re-submit inbound urb */
679 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
680 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
681 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
682 urb->iso_frame_desc[frame].actual_length = 0;
683 }
684
685 urb->number_of_packets = FRAMES_PER_URB;
686 urb->transfer_flags = URB_ISO_ASAP;
687 usb_submit_urb(urb, GFP_ATOMIC);
688 }
689
690 static void write_completed(struct urb *urb)
691 {
692 struct snd_usb_caiaq_cb_info *info = urb->context;
693 struct snd_usb_caiaqdev *dev = info->dev;
694
695 if (!dev->output_running) {
696 dev->output_running = 1;
697 wake_up(&dev->prepare_wait_queue);
698 }
699
700 clear_bit(info->index, &dev->outurb_active_mask);
701 }
702
703 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)
704 {
705 int i, frame;
706 struct urb **urbs;
707 struct usb_device *usb_dev = dev->chip.dev;
708 unsigned int pipe;
709
710 pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
711 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
712 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
713
714 urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);
715 if (!urbs) {
716 log("unable to kmalloc() urbs, OOM!?\n");
717 *ret = -ENOMEM;
718 return NULL;
719 }
720
721 for (i = 0; i < N_URBS; i++) {
722 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
723 if (!urbs[i]) {
724 log("unable to usb_alloc_urb(), OOM!?\n");
725 *ret = -ENOMEM;
726 return urbs;
727 }
728
729 urbs[i]->transfer_buffer =
730 kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);
731 if (!urbs[i]->transfer_buffer) {
732 log("unable to kmalloc() transfer buffer, OOM!?\n");
733 *ret = -ENOMEM;
734 return urbs;
735 }
736
737 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
738 struct usb_iso_packet_descriptor *iso =
739 &urbs[i]->iso_frame_desc[frame];
740
741 iso->offset = BYTES_PER_FRAME * frame;
742 iso->length = BYTES_PER_FRAME;
743 }
744
745 urbs[i]->dev = usb_dev;
746 urbs[i]->pipe = pipe;
747 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
748 * BYTES_PER_FRAME;
749 urbs[i]->context = &dev->data_cb_info[i];
750 urbs[i]->interval = 1;
751 urbs[i]->transfer_flags = URB_ISO_ASAP;
752 urbs[i]->number_of_packets = FRAMES_PER_URB;
753 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
754 read_completed : write_completed;
755 }
756
757 *ret = 0;
758 return urbs;
759 }
760
761 static void free_urbs(struct urb **urbs)
762 {
763 int i;
764
765 if (!urbs)
766 return;
767
768 for (i = 0; i < N_URBS; i++) {
769 if (!urbs[i])
770 continue;
771
772 usb_kill_urb(urbs[i]);
773 kfree(urbs[i]->transfer_buffer);
774 usb_free_urb(urbs[i]);
775 }
776
777 kfree(urbs);
778 }
779
780 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
781 {
782 int i, ret;
783
784 dev->n_audio_in = max(dev->spec.num_analog_audio_in,
785 dev->spec.num_digital_audio_in) /
786 CHANNELS_PER_STREAM;
787 dev->n_audio_out = max(dev->spec.num_analog_audio_out,
788 dev->spec.num_digital_audio_out) /
789 CHANNELS_PER_STREAM;
790 dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);
791
792 debug("dev->n_audio_in = %d\n", dev->n_audio_in);
793 debug("dev->n_audio_out = %d\n", dev->n_audio_out);
794 debug("dev->n_streams = %d\n", dev->n_streams);
795
796 if (dev->n_streams > MAX_STREAMS) {
797 log("unable to initialize device, too many streams.\n");
798 return -EINVAL;
799 }
800
801 ret = snd_pcm_new(dev->chip.card, dev->product_name, 0,
802 dev->n_audio_out, dev->n_audio_in, &dev->pcm);
803
804 if (ret < 0) {
805 log("snd_pcm_new() returned %d\n", ret);
806 return ret;
807 }
808
809 dev->pcm->private_data = dev;
810 strlcpy(dev->pcm->name, dev->product_name, sizeof(dev->pcm->name));
811
812 memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
813 memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
814
815 memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,
816 sizeof(snd_usb_caiaq_pcm_hardware));
817
818 /* setup samplerates */
819 dev->samplerates = dev->pcm_info.rates;
820 switch (dev->chip.usb_id) {
821 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
822 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
823 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
824 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
825 dev->samplerates |= SNDRV_PCM_RATE_192000;
826 /* fall thru */
827 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO2DJ):
828 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
829 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
830 case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORAUDIO2):
831 dev->samplerates |= SNDRV_PCM_RATE_88200;
832 break;
833 }
834
835 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
836 &snd_usb_caiaq_ops);
837 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
838 &snd_usb_caiaq_ops);
839
840 snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
841 SNDRV_DMA_TYPE_CONTINUOUS,
842 snd_dma_continuous_data(GFP_KERNEL),
843 MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
844
845 dev->data_cb_info =
846 kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS,
847 GFP_KERNEL);
848
849 if (!dev->data_cb_info)
850 return -ENOMEM;
851
852 dev->outurb_active_mask = 0;
853 BUILD_BUG_ON(N_URBS > (sizeof(dev->outurb_active_mask) * 8));
854
855 for (i = 0; i < N_URBS; i++) {
856 dev->data_cb_info[i].dev = dev;
857 dev->data_cb_info[i].index = i;
858 }
859
860 dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
861 if (ret < 0) {
862 kfree(dev->data_cb_info);
863 free_urbs(dev->data_urbs_in);
864 return ret;
865 }
866
867 dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
868 if (ret < 0) {
869 kfree(dev->data_cb_info);
870 free_urbs(dev->data_urbs_in);
871 free_urbs(dev->data_urbs_out);
872 return ret;
873 }
874
875 return 0;
876 }
877
878 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
879 {
880 debug("%s(%p)\n", __func__, dev);
881 stream_stop(dev);
882 free_urbs(dev->data_urbs_in);
883 free_urbs(dev->data_urbs_out);
884 kfree(dev->data_cb_info);
885 }
886
linux-next