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treewide: kzalloc() -> kcalloc()
[linux-2.6/btrfs-unstable.git] / sound / usb / 6fire / pcm.c
blob2dd2518a71d3e2b7ecffbbe1df5d6d98de8ae14d
1 /*
2 * Linux driver for TerraTec DMX 6Fire USB
3 *
4 * PCM driver
5 *
6 * Author: Torsten Schenk <torsten.schenk@zoho.com>
7 * Created: Jan 01, 2011
8 * Copyright: (C) Torsten Schenk
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16 #include "pcm.h"
17 #include "chip.h"
18 #include "comm.h"
19 #include "control.h"
20
21 enum {
22 OUT_N_CHANNELS = 6, IN_N_CHANNELS = 4
23 };
24
25 /* keep next two synced with
26 * FW_EP_W_MAX_PACKET_SIZE[] and RATES_MAX_PACKET_SIZE
27 * and CONTROL_RATE_XXX in control.h */
28 static const int rates_in_packet_size[] = { 228, 228, 420, 420, 404, 404 };
29 static const int rates_out_packet_size[] = { 228, 228, 420, 420, 604, 604 };
30 static const int rates[] = { 44100, 48000, 88200, 96000, 176400, 192000 };
31 static const int rates_alsaid[] = {
32 SNDRV_PCM_RATE_44100, SNDRV_PCM_RATE_48000,
33 SNDRV_PCM_RATE_88200, SNDRV_PCM_RATE_96000,
34 SNDRV_PCM_RATE_176400, SNDRV_PCM_RATE_192000 };
35
36 enum { /* settings for pcm */
37 OUT_EP = 6, IN_EP = 2, MAX_BUFSIZE = 128 * 1024
38 };
39
40 enum { /* pcm streaming states */
41 STREAM_DISABLED, /* no pcm streaming */
42 STREAM_STARTING, /* pcm streaming requested, waiting to become ready */
43 STREAM_RUNNING, /* pcm streaming running */
44 STREAM_STOPPING
45 };
46
47 static const struct snd_pcm_hardware pcm_hw = {
48 .info = SNDRV_PCM_INFO_MMAP |
49 SNDRV_PCM_INFO_INTERLEAVED |
50 SNDRV_PCM_INFO_BLOCK_TRANSFER |
51 SNDRV_PCM_INFO_MMAP_VALID |
52 SNDRV_PCM_INFO_BATCH,
53
54 .formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
55
56 .rates = SNDRV_PCM_RATE_44100 |
57 SNDRV_PCM_RATE_48000 |
58 SNDRV_PCM_RATE_88200 |
59 SNDRV_PCM_RATE_96000 |
60 SNDRV_PCM_RATE_176400 |
61 SNDRV_PCM_RATE_192000,
62
63 .rate_min = 44100,
64 .rate_max = 192000,
65 .channels_min = 1,
66 .channels_max = 0, /* set in pcm_open, depending on capture/playback */
67 .buffer_bytes_max = MAX_BUFSIZE,
68 .period_bytes_min = PCM_N_PACKETS_PER_URB * (PCM_MAX_PACKET_SIZE - 4),
69 .period_bytes_max = MAX_BUFSIZE,
70 .periods_min = 2,
71 .periods_max = 1024
72 };
73
74 static int usb6fire_pcm_set_rate(struct pcm_runtime *rt)
75 {
76 int ret;
77 struct control_runtime *ctrl_rt = rt->chip->control;
78
79 ctrl_rt->usb_streaming = false;
80 ret = ctrl_rt->update_streaming(ctrl_rt);
81 if (ret < 0) {
82 dev_err(&rt->chip->dev->dev,
83 "error stopping streaming while setting samplerate %d.\n",
84 rates[rt->rate]);
85 return ret;
86 }
87
88 ret = ctrl_rt->set_rate(ctrl_rt, rt->rate);
89 if (ret < 0) {
90 dev_err(&rt->chip->dev->dev,
91 "error setting samplerate %d.\n",
92 rates[rt->rate]);
93 return ret;
94 }
95
96 ret = ctrl_rt->set_channels(ctrl_rt, OUT_N_CHANNELS, IN_N_CHANNELS,
97 false, false);
98 if (ret < 0) {
99 dev_err(&rt->chip->dev->dev,
100 "error initializing channels while setting samplerate %d.\n",
101 rates[rt->rate]);
102 return ret;
103 }
104
105 ctrl_rt->usb_streaming = true;
106 ret = ctrl_rt->update_streaming(ctrl_rt);
107 if (ret < 0) {
108 dev_err(&rt->chip->dev->dev,
109 "error starting streaming while setting samplerate %d.\n",
110 rates[rt->rate]);
111 return ret;
112 }
113
114 rt->in_n_analog = IN_N_CHANNELS;
115 rt->out_n_analog = OUT_N_CHANNELS;
116 rt->in_packet_size = rates_in_packet_size[rt->rate];
117 rt->out_packet_size = rates_out_packet_size[rt->rate];
118 return 0;
119 }
120
121 static struct pcm_substream *usb6fire_pcm_get_substream(
122 struct snd_pcm_substream *alsa_sub)
123 {
124 struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
125
126 if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
127 return &rt->playback;
128 else if (alsa_sub->stream == SNDRV_PCM_STREAM_CAPTURE)
129 return &rt->capture;
130 dev_err(&rt->chip->dev->dev, "error getting pcm substream slot.\n");
131 return NULL;
132 }
133
134 /* call with stream_mutex locked */
135 static void usb6fire_pcm_stream_stop(struct pcm_runtime *rt)
136 {
137 int i;
138 struct control_runtime *ctrl_rt = rt->chip->control;
139
140 if (rt->stream_state != STREAM_DISABLED) {
141
142 rt->stream_state = STREAM_STOPPING;
143
144 for (i = 0; i < PCM_N_URBS; i++) {
145 usb_kill_urb(&rt->in_urbs[i].instance);
146 usb_kill_urb(&rt->out_urbs[i].instance);
147 }
148 ctrl_rt->usb_streaming = false;
149 ctrl_rt->update_streaming(ctrl_rt);
150 rt->stream_state = STREAM_DISABLED;
151 }
152 }
153
154 /* call with stream_mutex locked */
155 static int usb6fire_pcm_stream_start(struct pcm_runtime *rt)
156 {
157 int ret;
158 int i;
159 int k;
160 struct usb_iso_packet_descriptor *packet;
161
162 if (rt->stream_state == STREAM_DISABLED) {
163 /* submit our in urbs */
164 rt->stream_wait_cond = false;
165 rt->stream_state = STREAM_STARTING;
166 for (i = 0; i < PCM_N_URBS; i++) {
167 for (k = 0; k < PCM_N_PACKETS_PER_URB; k++) {
168 packet = &rt->in_urbs[i].packets[k];
169 packet->offset = k * rt->in_packet_size;
170 packet->length = rt->in_packet_size;
171 packet->actual_length = 0;
172 packet->status = 0;
173 }
174 ret = usb_submit_urb(&rt->in_urbs[i].instance,
175 GFP_ATOMIC);
176 if (ret) {
177 usb6fire_pcm_stream_stop(rt);
178 return ret;
179 }
180 }
181
182 /* wait for first out urb to return (sent in in urb handler) */
183 wait_event_timeout(rt->stream_wait_queue, rt->stream_wait_cond,
184 HZ);
185 if (rt->stream_wait_cond)
186 rt->stream_state = STREAM_RUNNING;
187 else {
188 usb6fire_pcm_stream_stop(rt);
189 return -EIO;
190 }
191 }
192 return 0;
193 }
194
195 /* call with substream locked */
196 static void usb6fire_pcm_capture(struct pcm_substream *sub, struct pcm_urb *urb)
197 {
198 int i;
199 int frame;
200 int frame_count;
201 unsigned int total_length = 0;
202 struct pcm_runtime *rt = snd_pcm_substream_chip(sub->instance);
203 struct snd_pcm_runtime *alsa_rt = sub->instance->runtime;
204 u32 *src = NULL;
205 u32 *dest = (u32 *) (alsa_rt->dma_area + sub->dma_off
206 * (alsa_rt->frame_bits >> 3));
207 u32 *dest_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size
208 * (alsa_rt->frame_bits >> 3));
209 int bytes_per_frame = alsa_rt->channels << 2;
210
211 for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
212 /* at least 4 header bytes for valid packet.
213 * after that: 32 bits per sample for analog channels */
214 if (urb->packets[i].actual_length > 4)
215 frame_count = (urb->packets[i].actual_length - 4)
216 / (rt->in_n_analog << 2);
217 else
218 frame_count = 0;
219
220 if (alsa_rt->format == SNDRV_PCM_FORMAT_S24_LE)
221 src = (u32 *) (urb->buffer + total_length);
222 else if (alsa_rt->format == SNDRV_PCM_FORMAT_S32_LE)
223 src = (u32 *) (urb->buffer - 1 + total_length);
224 else
225 return;
226 src++; /* skip leading 4 bytes of every packet */
227 total_length += urb->packets[i].length;
228 for (frame = 0; frame < frame_count; frame++) {
229 memcpy(dest, src, bytes_per_frame);
230 dest += alsa_rt->channels;
231 src += rt->in_n_analog;
232 sub->dma_off++;
233 sub->period_off++;
234 if (dest == dest_end) {
235 sub->dma_off = 0;
236 dest = (u32 *) alsa_rt->dma_area;
237 }
238 }
239 }
240 }
241
242 /* call with substream locked */
243 static void usb6fire_pcm_playback(struct pcm_substream *sub,
244 struct pcm_urb *urb)
245 {
246 int i;
247 int frame;
248 int frame_count;
249 struct pcm_runtime *rt = snd_pcm_substream_chip(sub->instance);
250 struct snd_pcm_runtime *alsa_rt = sub->instance->runtime;
251 u32 *src = (u32 *) (alsa_rt->dma_area + sub->dma_off
252 * (alsa_rt->frame_bits >> 3));
253 u32 *src_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size
254 * (alsa_rt->frame_bits >> 3));
255 u32 *dest;
256 int bytes_per_frame = alsa_rt->channels << 2;
257
258 if (alsa_rt->format == SNDRV_PCM_FORMAT_S32_LE)
259 dest = (u32 *) (urb->buffer - 1);
260 else if (alsa_rt->format == SNDRV_PCM_FORMAT_S24_LE)
261 dest = (u32 *) (urb->buffer);
262 else {
263 dev_err(&rt->chip->dev->dev, "Unknown sample format.");
264 return;
265 }
266
267 for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
268 /* at least 4 header bytes for valid packet.
269 * after that: 32 bits per sample for analog channels */
270 if (urb->packets[i].length > 4)
271 frame_count = (urb->packets[i].length - 4)
272 / (rt->out_n_analog << 2);
273 else
274 frame_count = 0;
275 dest++; /* skip leading 4 bytes of every frame */
276 for (frame = 0; frame < frame_count; frame++) {
277 memcpy(dest, src, bytes_per_frame);
278 src += alsa_rt->channels;
279 dest += rt->out_n_analog;
280 sub->dma_off++;
281 sub->period_off++;
282 if (src == src_end) {
283 src = (u32 *) alsa_rt->dma_area;
284 sub->dma_off = 0;
285 }
286 }
287 }
288 }
289
290 static void usb6fire_pcm_in_urb_handler(struct urb *usb_urb)
291 {
292 struct pcm_urb *in_urb = usb_urb->context;
293 struct pcm_urb *out_urb = in_urb->peer;
294 struct pcm_runtime *rt = in_urb->chip->pcm;
295 struct pcm_substream *sub;
296 unsigned long flags;
297 int total_length = 0;
298 int frame_count;
299 int frame;
300 int channel;
301 int i;
302 u8 *dest;
303
304 if (usb_urb->status || rt->panic || rt->stream_state == STREAM_STOPPING)
305 return;
306 for (i = 0; i < PCM_N_PACKETS_PER_URB; i++)
307 if (in_urb->packets[i].status) {
308 rt->panic = true;
309 return;
310 }
311
312 if (rt->stream_state == STREAM_DISABLED) {
313 dev_err(&rt->chip->dev->dev,
314 "internal error: stream disabled in in-urb handler.\n");
315 return;
316 }
317
318 /* receive our capture data */
319 sub = &rt->capture;
320 spin_lock_irqsave(&sub->lock, flags);
321 if (sub->active) {
322 usb6fire_pcm_capture(sub, in_urb);
323 if (sub->period_off >= sub->instance->runtime->period_size) {
324 sub->period_off %= sub->instance->runtime->period_size;
325 spin_unlock_irqrestore(&sub->lock, flags);
326 snd_pcm_period_elapsed(sub->instance);
327 } else
328 spin_unlock_irqrestore(&sub->lock, flags);
329 } else
330 spin_unlock_irqrestore(&sub->lock, flags);
331
332 /* setup out urb structure */
333 for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
334 out_urb->packets[i].offset = total_length;
335 out_urb->packets[i].length = (in_urb->packets[i].actual_length
336 - 4) / (rt->in_n_analog << 2)
337 * (rt->out_n_analog << 2) + 4;
338 out_urb->packets[i].status = 0;
339 total_length += out_urb->packets[i].length;
340 }
341 memset(out_urb->buffer, 0, total_length);
342
343 /* now send our playback data (if a free out urb was found) */
344 sub = &rt->playback;
345 spin_lock_irqsave(&sub->lock, flags);
346 if (sub->active) {
347 usb6fire_pcm_playback(sub, out_urb);
348 if (sub->period_off >= sub->instance->runtime->period_size) {
349 sub->period_off %= sub->instance->runtime->period_size;
350 spin_unlock_irqrestore(&sub->lock, flags);
351 snd_pcm_period_elapsed(sub->instance);
352 } else
353 spin_unlock_irqrestore(&sub->lock, flags);
354 } else
355 spin_unlock_irqrestore(&sub->lock, flags);
356
357 /* setup the 4th byte of each sample (0x40 for analog channels) */
358 dest = out_urb->buffer;
359 for (i = 0; i < PCM_N_PACKETS_PER_URB; i++)
360 if (out_urb->packets[i].length >= 4) {
361 frame_count = (out_urb->packets[i].length - 4)
362 / (rt->out_n_analog << 2);
363 *(dest++) = 0xaa;
364 *(dest++) = 0xaa;
365 *(dest++) = frame_count;
366 *(dest++) = 0x00;
367 for (frame = 0; frame < frame_count; frame++)
368 for (channel = 0;
369 channel < rt->out_n_analog;
370 channel++) {
371 dest += 3; /* skip sample data */
372 *(dest++) = 0x40;
373 }
374 }
375 usb_submit_urb(&out_urb->instance, GFP_ATOMIC);
376 usb_submit_urb(&in_urb->instance, GFP_ATOMIC);
377 }
378
379 static void usb6fire_pcm_out_urb_handler(struct urb *usb_urb)
380 {
381 struct pcm_urb *urb = usb_urb->context;
382 struct pcm_runtime *rt = urb->chip->pcm;
383
384 if (rt->stream_state == STREAM_STARTING) {
385 rt->stream_wait_cond = true;
386 wake_up(&rt->stream_wait_queue);
387 }
388 }
389
390 static int usb6fire_pcm_open(struct snd_pcm_substream *alsa_sub)
391 {
392 struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
393 struct pcm_substream *sub = NULL;
394 struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
395
396 if (rt->panic)
397 return -EPIPE;
398
399 mutex_lock(&rt->stream_mutex);
400 alsa_rt->hw = pcm_hw;
401
402 if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK) {
403 if (rt->rate < ARRAY_SIZE(rates))
404 alsa_rt->hw.rates = rates_alsaid[rt->rate];
405 alsa_rt->hw.channels_max = OUT_N_CHANNELS;
406 sub = &rt->playback;
407 } else if (alsa_sub->stream == SNDRV_PCM_STREAM_CAPTURE) {
408 if (rt->rate < ARRAY_SIZE(rates))
409 alsa_rt->hw.rates = rates_alsaid[rt->rate];
410 alsa_rt->hw.channels_max = IN_N_CHANNELS;
411 sub = &rt->capture;
412 }
413
414 if (!sub) {
415 mutex_unlock(&rt->stream_mutex);
416 dev_err(&rt->chip->dev->dev, "invalid stream type.\n");
417 return -EINVAL;
418 }
419
420 sub->instance = alsa_sub;
421 sub->active = false;
422 mutex_unlock(&rt->stream_mutex);
423 return 0;
424 }
425
426 static int usb6fire_pcm_close(struct snd_pcm_substream *alsa_sub)
427 {
428 struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
429 struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
430 unsigned long flags;
431
432 if (rt->panic)
433 return 0;
434
435 mutex_lock(&rt->stream_mutex);
436 if (sub) {
437 /* deactivate substream */
438 spin_lock_irqsave(&sub->lock, flags);
439 sub->instance = NULL;
440 sub->active = false;
441 spin_unlock_irqrestore(&sub->lock, flags);
442
443 /* all substreams closed? if so, stop streaming */
444 if (!rt->playback.instance && !rt->capture.instance) {
445 usb6fire_pcm_stream_stop(rt);
446 rt->rate = ARRAY_SIZE(rates);
447 }
448 }
449 mutex_unlock(&rt->stream_mutex);
450 return 0;
451 }
452
453 static int usb6fire_pcm_hw_params(struct snd_pcm_substream *alsa_sub,
454 struct snd_pcm_hw_params *hw_params)
455 {
456 return snd_pcm_lib_alloc_vmalloc_buffer(alsa_sub,
457 params_buffer_bytes(hw_params));
458 }
459
460 static int usb6fire_pcm_hw_free(struct snd_pcm_substream *alsa_sub)
461 {
462 return snd_pcm_lib_free_vmalloc_buffer(alsa_sub);
463 }
464
465 static int usb6fire_pcm_prepare(struct snd_pcm_substream *alsa_sub)
466 {
467 struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
468 struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
469 struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
470 int ret;
471
472 if (rt->panic)
473 return -EPIPE;
474 if (!sub)
475 return -ENODEV;
476
477 mutex_lock(&rt->stream_mutex);
478 sub->dma_off = 0;
479 sub->period_off = 0;
480
481 if (rt->stream_state == STREAM_DISABLED) {
482 for (rt->rate = 0; rt->rate < ARRAY_SIZE(rates); rt->rate++)
483 if (alsa_rt->rate == rates[rt->rate])
484 break;
485 if (rt->rate == ARRAY_SIZE(rates)) {
486 mutex_unlock(&rt->stream_mutex);
487 dev_err(&rt->chip->dev->dev,
488 "invalid rate %d in prepare.\n",
489 alsa_rt->rate);
490 return -EINVAL;
491 }
492
493 ret = usb6fire_pcm_set_rate(rt);
494 if (ret) {
495 mutex_unlock(&rt->stream_mutex);
496 return ret;
497 }
498 ret = usb6fire_pcm_stream_start(rt);
499 if (ret) {
500 mutex_unlock(&rt->stream_mutex);
501 dev_err(&rt->chip->dev->dev,
502 "could not start pcm stream.\n");
503 return ret;
504 }
505 }
506 mutex_unlock(&rt->stream_mutex);
507 return 0;
508 }
509
510 static int usb6fire_pcm_trigger(struct snd_pcm_substream *alsa_sub, int cmd)
511 {
512 struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
513 struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
514 unsigned long flags;
515
516 if (rt->panic)
517 return -EPIPE;
518 if (!sub)
519 return -ENODEV;
520
521 switch (cmd) {
522 case SNDRV_PCM_TRIGGER_START:
523 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
524 spin_lock_irqsave(&sub->lock, flags);
525 sub->active = true;
526 spin_unlock_irqrestore(&sub->lock, flags);
527 return 0;
528
529 case SNDRV_PCM_TRIGGER_STOP:
530 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
531 spin_lock_irqsave(&sub->lock, flags);
532 sub->active = false;
533 spin_unlock_irqrestore(&sub->lock, flags);
534 return 0;
535
536 default:
537 return -EINVAL;
538 }
539 }
540
541 static snd_pcm_uframes_t usb6fire_pcm_pointer(
542 struct snd_pcm_substream *alsa_sub)
543 {
544 struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
545 struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
546 unsigned long flags;
547 snd_pcm_uframes_t ret;
548
549 if (rt->panic || !sub)
550 return SNDRV_PCM_POS_XRUN;
551
552 spin_lock_irqsave(&sub->lock, flags);
553 ret = sub->dma_off;
554 spin_unlock_irqrestore(&sub->lock, flags);
555 return ret;
556 }
557
558 static const struct snd_pcm_ops pcm_ops = {
559 .open = usb6fire_pcm_open,
560 .close = usb6fire_pcm_close,
561 .ioctl = snd_pcm_lib_ioctl,
562 .hw_params = usb6fire_pcm_hw_params,
563 .hw_free = usb6fire_pcm_hw_free,
564 .prepare = usb6fire_pcm_prepare,
565 .trigger = usb6fire_pcm_trigger,
566 .pointer = usb6fire_pcm_pointer,
567 .page = snd_pcm_lib_get_vmalloc_page,
568 .mmap = snd_pcm_lib_mmap_vmalloc,
569 };
570
571 static void usb6fire_pcm_init_urb(struct pcm_urb *urb,
572 struct sfire_chip *chip, bool in, int ep,
573 void (*handler)(struct urb *))
574 {
575 urb->chip = chip;
576 usb_init_urb(&urb->instance);
577 urb->instance.transfer_buffer = urb->buffer;
578 urb->instance.transfer_buffer_length =
579 PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE;
580 urb->instance.dev = chip->dev;
581 urb->instance.pipe = in ? usb_rcvisocpipe(chip->dev, ep)
582 : usb_sndisocpipe(chip->dev, ep);
583 urb->instance.interval = 1;
584 urb->instance.complete = handler;
585 urb->instance.context = urb;
586 urb->instance.number_of_packets = PCM_N_PACKETS_PER_URB;
587 }
588
589 static int usb6fire_pcm_buffers_init(struct pcm_runtime *rt)
590 {
591 int i;
592
593 for (i = 0; i < PCM_N_URBS; i++) {
594 rt->out_urbs[i].buffer = kcalloc(PCM_MAX_PACKET_SIZE,
595 PCM_N_PACKETS_PER_URB,
596 GFP_KERNEL);
597 if (!rt->out_urbs[i].buffer)
598 return -ENOMEM;
599 rt->in_urbs[i].buffer = kcalloc(PCM_MAX_PACKET_SIZE,
600 PCM_N_PACKETS_PER_URB,
601 GFP_KERNEL);
602 if (!rt->in_urbs[i].buffer)
603 return -ENOMEM;
604 }
605 return 0;
606 }
607
608 static void usb6fire_pcm_buffers_destroy(struct pcm_runtime *rt)
609 {
610 int i;
611
612 for (i = 0; i < PCM_N_URBS; i++) {
613 kfree(rt->out_urbs[i].buffer);
614 kfree(rt->in_urbs[i].buffer);
615 }
616 }
617
618 int usb6fire_pcm_init(struct sfire_chip *chip)
619 {
620 int i;
621 int ret;
622 struct snd_pcm *pcm;
623 struct pcm_runtime *rt =
624 kzalloc(sizeof(struct pcm_runtime), GFP_KERNEL);
625
626 if (!rt)
627 return -ENOMEM;
628
629 ret = usb6fire_pcm_buffers_init(rt);
630 if (ret) {
631 usb6fire_pcm_buffers_destroy(rt);
632 kfree(rt);
633 return ret;
634 }
635
636 rt->chip = chip;
637 rt->stream_state = STREAM_DISABLED;
638 rt->rate = ARRAY_SIZE(rates);
639 init_waitqueue_head(&rt->stream_wait_queue);
640 mutex_init(&rt->stream_mutex);
641
642 spin_lock_init(&rt->playback.lock);
643 spin_lock_init(&rt->capture.lock);
644
645 for (i = 0; i < PCM_N_URBS; i++) {
646 usb6fire_pcm_init_urb(&rt->in_urbs[i], chip, true, IN_EP,
647 usb6fire_pcm_in_urb_handler);
648 usb6fire_pcm_init_urb(&rt->out_urbs[i], chip, false, OUT_EP,
649 usb6fire_pcm_out_urb_handler);
650
651 rt->in_urbs[i].peer = &rt->out_urbs[i];
652 rt->out_urbs[i].peer = &rt->in_urbs[i];
653 }
654
655 ret = snd_pcm_new(chip->card, "DMX6FireUSB", 0, 1, 1, &pcm);
656 if (ret < 0) {
657 usb6fire_pcm_buffers_destroy(rt);
658 kfree(rt);
659 dev_err(&chip->dev->dev, "cannot create pcm instance.\n");
660 return ret;
661 }
662
663 pcm->private_data = rt;
664 strcpy(pcm->name, "DMX 6Fire USB");
665 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops);
666 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_ops);
667
668 if (ret) {
669 usb6fire_pcm_buffers_destroy(rt);
670 kfree(rt);
671 dev_err(&chip->dev->dev,
672 "error preallocating pcm buffers.\n");
673 return ret;
674 }
675 rt->instance = pcm;
676
677 chip->pcm = rt;
678 return 0;
679 }
680
681 void usb6fire_pcm_abort(struct sfire_chip *chip)
682 {
683 struct pcm_runtime *rt = chip->pcm;
684 int i;
685
686 if (rt) {
687 rt->panic = true;
688
689 if (rt->playback.instance)
690 snd_pcm_stop_xrun(rt->playback.instance);
691
692 if (rt->capture.instance)
693 snd_pcm_stop_xrun(rt->capture.instance);
694
695 for (i = 0; i < PCM_N_URBS; i++) {
696 usb_poison_urb(&rt->in_urbs[i].instance);
697 usb_poison_urb(&rt->out_urbs[i].instance);
698 }
699
700 }
701 }
702
703 void usb6fire_pcm_destroy(struct sfire_chip *chip)
704 {
705 struct pcm_runtime *rt = chip->pcm;
706
707 usb6fire_pcm_buffers_destroy(rt);
708 kfree(rt);
709 chip->pcm = NULL;
710 }
(deprecated) Btrfs devel tree