pcm.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Linux driver for TerraTec DMX 6Fire USB
  4 *
  5 * PCM driver
  6 *
  7 * Author:	Torsten Schenk <torsten.schenk@zoho.com>
  8 * Created:	Jan 01, 2011
  9 * Copyright:	(C) Torsten Schenk
 10 */
 11
 12#include "pcm.h"
 13#include "chip.h"
 14#include "comm.h"
 15#include "control.h"
 16
 17enum {
 18	OUT_N_CHANNELS = 6, IN_N_CHANNELS = 4
 19};
 20
 21/* keep next two synced with
 22 * FW_EP_W_MAX_PACKET_SIZE[] and RATES_MAX_PACKET_SIZE
 23 * and CONTROL_RATE_XXX in control.h */
 24static const int rates_in_packet_size[] = { 228, 228, 420, 420, 404, 404 };
 25static const int rates_out_packet_size[] = { 228, 228, 420, 420, 604, 604 };
 26static const int rates[] = { 44100, 48000, 88200, 96000, 176400, 192000 };
 27static const int rates_alsaid[] = {
 28	SNDRV_PCM_RATE_44100, SNDRV_PCM_RATE_48000,
 29	SNDRV_PCM_RATE_88200, SNDRV_PCM_RATE_96000,
 30	SNDRV_PCM_RATE_176400, SNDRV_PCM_RATE_192000 };
 31
 32enum { /* settings for pcm */
 33	OUT_EP = 6, IN_EP = 2, MAX_BUFSIZE = 128 * 1024
 34};
 35
 36enum { /* pcm streaming states */
 37	STREAM_DISABLED, /* no pcm streaming */
 38	STREAM_STARTING, /* pcm streaming requested, waiting to become ready */
 39	STREAM_RUNNING, /* pcm streaming running */
 40	STREAM_STOPPING
 41};
 42
 43static const struct snd_pcm_hardware pcm_hw = {
 44	.info = SNDRV_PCM_INFO_MMAP |
 45		SNDRV_PCM_INFO_INTERLEAVED |
 46		SNDRV_PCM_INFO_BLOCK_TRANSFER |
 47		SNDRV_PCM_INFO_MMAP_VALID |
 48		SNDRV_PCM_INFO_BATCH,
 49
 50	.formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
 51
 52	.rates = SNDRV_PCM_RATE_44100 |
 53		SNDRV_PCM_RATE_48000 |
 54		SNDRV_PCM_RATE_88200 |
 55		SNDRV_PCM_RATE_96000 |
 56		SNDRV_PCM_RATE_176400 |
 57		SNDRV_PCM_RATE_192000,
 58
 59	.rate_min = 44100,
 60	.rate_max = 192000,
 61	.channels_min = 1,
 62	.channels_max = 0, /* set in pcm_open, depending on capture/playback */
 63	.buffer_bytes_max = MAX_BUFSIZE,
 64	.period_bytes_min = PCM_N_PACKETS_PER_URB * (PCM_MAX_PACKET_SIZE - 4),
 65	.period_bytes_max = MAX_BUFSIZE,
 66	.periods_min = 2,
 67	.periods_max = 1024
 68};
 69
 70static int usb6fire_pcm_set_rate(struct pcm_runtime *rt)
 71{
 72	int ret;
 73	struct control_runtime *ctrl_rt = rt->chip->control;
 74
 75	ctrl_rt->usb_streaming = false;
 76	ret = ctrl_rt->update_streaming(ctrl_rt);
 77	if (ret < 0) {
 78		dev_err(&rt->chip->dev->dev,
 79			"error stopping streaming while setting samplerate %d.\n",
 80			rates[rt->rate]);
 81		return ret;
 82	}
 83
 84	ret = ctrl_rt->set_rate(ctrl_rt, rt->rate);
 85	if (ret < 0) {
 86		dev_err(&rt->chip->dev->dev,
 87			"error setting samplerate %d.\n",
 88			rates[rt->rate]);
 89		return ret;
 90	}
 91
 92	ret = ctrl_rt->set_channels(ctrl_rt, OUT_N_CHANNELS, IN_N_CHANNELS,
 93			false, false);
 94	if (ret < 0) {
 95		dev_err(&rt->chip->dev->dev,
 96			"error initializing channels while setting samplerate %d.\n",
 97			rates[rt->rate]);
 98		return ret;
 99	}
100
101	ctrl_rt->usb_streaming = true;
102	ret = ctrl_rt->update_streaming(ctrl_rt);
103	if (ret < 0) {
104		dev_err(&rt->chip->dev->dev,
105			"error starting streaming while setting samplerate %d.\n",
106			rates[rt->rate]);
107		return ret;
108	}
109
110	rt->in_n_analog = IN_N_CHANNELS;
111	rt->out_n_analog = OUT_N_CHANNELS;
112	rt->in_packet_size = rates_in_packet_size[rt->rate];
113	rt->out_packet_size = rates_out_packet_size[rt->rate];
114	return 0;
115}
116
117static struct pcm_substream *usb6fire_pcm_get_substream(
118		struct snd_pcm_substream *alsa_sub)
119{
120	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
121
122	if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
123		return &rt->playback;
124	else if (alsa_sub->stream == SNDRV_PCM_STREAM_CAPTURE)
125		return &rt->capture;
126	dev_err(&rt->chip->dev->dev, "error getting pcm substream slot.\n");
127	return NULL;
128}
129
130/* call with stream_mutex locked */
131static void usb6fire_pcm_stream_stop(struct pcm_runtime *rt)
132{
133	int i;
134	struct control_runtime *ctrl_rt = rt->chip->control;
135
136	if (rt->stream_state != STREAM_DISABLED) {
137
138		rt->stream_state = STREAM_STOPPING;
139
140		for (i = 0; i < PCM_N_URBS; i++) {
141			usb_kill_urb(&rt->in_urbs[i].instance);
142			usb_kill_urb(&rt->out_urbs[i].instance);
143		}
144		ctrl_rt->usb_streaming = false;
145		ctrl_rt->update_streaming(ctrl_rt);
146		rt->stream_state = STREAM_DISABLED;
147	}
148}
149
150/* call with stream_mutex locked */
151static int usb6fire_pcm_stream_start(struct pcm_runtime *rt)
152{
153	int ret;
154	int i;
155	int k;
156	struct usb_iso_packet_descriptor *packet;
157
158	if (rt->stream_state == STREAM_DISABLED) {
159		/* submit our in urbs */
160		rt->stream_wait_cond = false;
161		rt->stream_state = STREAM_STARTING;
162		for (i = 0; i < PCM_N_URBS; i++) {
163			for (k = 0; k < PCM_N_PACKETS_PER_URB; k++) {
164				packet = &rt->in_urbs[i].packets[k];
165				packet->offset = k * rt->in_packet_size;
166				packet->length = rt->in_packet_size;
167				packet->actual_length = 0;
168				packet->status = 0;
169			}
170			ret = usb_submit_urb(&rt->in_urbs[i].instance,
171					GFP_ATOMIC);
172			if (ret) {
173				usb6fire_pcm_stream_stop(rt);
174				return ret;
175			}
176		}
177
178		/* wait for first out urb to return (sent in urb handler) */
179		wait_event_timeout(rt->stream_wait_queue, rt->stream_wait_cond,
180				HZ);
181		if (rt->stream_wait_cond)
182			rt->stream_state = STREAM_RUNNING;
183		else {
184			usb6fire_pcm_stream_stop(rt);
185			return -EIO;
186		}
187	}
188	return 0;
189}
190
191/* call with substream locked */
192static void usb6fire_pcm_capture(struct pcm_substream *sub, struct pcm_urb *urb)
193{
194	int i;
195	int frame;
196	int frame_count;
197	unsigned int total_length = 0;
198	struct pcm_runtime *rt = snd_pcm_substream_chip(sub->instance);
199	struct snd_pcm_runtime *alsa_rt = sub->instance->runtime;
200	u32 *src = NULL;
201	u32 *dest = (u32 *) (alsa_rt->dma_area + sub->dma_off
202			* (alsa_rt->frame_bits >> 3));
203	u32 *dest_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size
204			* (alsa_rt->frame_bits >> 3));
205	int bytes_per_frame = alsa_rt->channels << 2;
206
207	for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
208		/* at least 4 header bytes for valid packet.
209		 * after that: 32 bits per sample for analog channels */
210		if (urb->packets[i].actual_length > 4)
211			frame_count = (urb->packets[i].actual_length - 4)
212					/ (rt->in_n_analog << 2);
213		else
214			frame_count = 0;
215
216		if (alsa_rt->format == SNDRV_PCM_FORMAT_S24_LE)
217			src = (u32 *) (urb->buffer + total_length);
218		else if (alsa_rt->format == SNDRV_PCM_FORMAT_S32_LE)
219			src = (u32 *) (urb->buffer - 1 + total_length);
220		else
221			return;
222		src++; /* skip leading 4 bytes of every packet */
223		total_length += urb->packets[i].length;
224		for (frame = 0; frame < frame_count; frame++) {
225			memcpy(dest, src, bytes_per_frame);
226			dest += alsa_rt->channels;
227			src += rt->in_n_analog;
228			sub->dma_off++;
229			sub->period_off++;
230			if (dest == dest_end) {
231				sub->dma_off = 0;
232				dest = (u32 *) alsa_rt->dma_area;
233			}
234		}
235	}
236}
237
238/* call with substream locked */
239static void usb6fire_pcm_playback(struct pcm_substream *sub,
240		struct pcm_urb *urb)
241{
242	int i;
243	int frame;
244	int frame_count;
245	struct pcm_runtime *rt = snd_pcm_substream_chip(sub->instance);
246	struct snd_pcm_runtime *alsa_rt = sub->instance->runtime;
247	u32 *src = (u32 *) (alsa_rt->dma_area + sub->dma_off
248			* (alsa_rt->frame_bits >> 3));
249	u32 *src_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size
250			* (alsa_rt->frame_bits >> 3));
251	u32 *dest;
252	int bytes_per_frame = alsa_rt->channels << 2;
253
254	if (alsa_rt->format == SNDRV_PCM_FORMAT_S32_LE)
255		dest = (u32 *) (urb->buffer - 1);
256	else if (alsa_rt->format == SNDRV_PCM_FORMAT_S24_LE)
257		dest = (u32 *) (urb->buffer);
258	else {
259		dev_err(&rt->chip->dev->dev, "Unknown sample format.");
260		return;
261	}
262
263	for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
264		/* at least 4 header bytes for valid packet.
265		 * after that: 32 bits per sample for analog channels */
266		if (urb->packets[i].length > 4)
267			frame_count = (urb->packets[i].length - 4)
268					/ (rt->out_n_analog << 2);
269		else
270			frame_count = 0;
271		dest++; /* skip leading 4 bytes of every frame */
272		for (frame = 0; frame < frame_count; frame++) {
273			memcpy(dest, src, bytes_per_frame);
274			src += alsa_rt->channels;
275			dest += rt->out_n_analog;
276			sub->dma_off++;
277			sub->period_off++;
278			if (src == src_end) {
279				src = (u32 *) alsa_rt->dma_area;
280				sub->dma_off = 0;
281			}
282		}
283	}
284}
285
286static void usb6fire_pcm_in_urb_handler(struct urb *usb_urb)
287{
288	struct pcm_urb *in_urb = usb_urb->context;
289	struct pcm_urb *out_urb = in_urb->peer;
290	struct pcm_runtime *rt = in_urb->chip->pcm;
291	struct pcm_substream *sub;
292	bool period_elapsed;
293	int total_length = 0;
294	int frame_count;
295	int frame;
296	int channel;
297	int i;
298	u8 *dest;
299
300	if (usb_urb->status || rt->panic || rt->stream_state == STREAM_STOPPING)
301		return;
302	for (i = 0; i < PCM_N_PACKETS_PER_URB; i++)
303		if (in_urb->packets[i].status) {
304			rt->panic = true;
305			return;
306		}
307
308	if (rt->stream_state == STREAM_DISABLED) {
309		dev_err(&rt->chip->dev->dev,
310			"internal error: stream disabled in in-urb handler.\n");
311		return;
312	}
313
314	/* receive our capture data */
315	sub = &rt->capture;
316	period_elapsed = false;
317	scoped_guard(spinlock_irqsave, &sub->lock) {
318		if (sub->active) {
319			usb6fire_pcm_capture(sub, in_urb);
320			if (sub->period_off >= sub->instance->runtime->period_size) {
321				sub->period_off %= sub->instance->runtime->period_size;
322				period_elapsed = true;
323			}
324		}
325	}
326	if (period_elapsed)
327		snd_pcm_period_elapsed(sub->instance);
328
329	/* setup out urb structure */
330	for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
331		out_urb->packets[i].offset = total_length;
332		out_urb->packets[i].length = (in_urb->packets[i].actual_length
333				- 4) / (rt->in_n_analog << 2)
334				* (rt->out_n_analog << 2) + 4;
335		out_urb->packets[i].status = 0;
336		total_length += out_urb->packets[i].length;
337	}
338	memset(out_urb->buffer, 0, total_length);
339
340	/* now send our playback data (if a free out urb was found) */
341	sub = &rt->playback;
342	period_elapsed = false;
343	scoped_guard(spinlock_irqsave, &sub->lock) {
344		if (sub->active) {
345			usb6fire_pcm_playback(sub, out_urb);
346			if (sub->period_off >= sub->instance->runtime->period_size) {
347				sub->period_off %= sub->instance->runtime->period_size;
348				period_elapsed = true;
349			}
350		}
351	}
352	if (period_elapsed)
353		snd_pcm_period_elapsed(sub->instance);
354
355	/* setup the 4th byte of each sample (0x40 for analog channels) */
356	dest = out_urb->buffer;
357	for (i = 0; i < PCM_N_PACKETS_PER_URB; i++)
358		if (out_urb->packets[i].length >= 4) {
359			frame_count = (out_urb->packets[i].length - 4)
360					/ (rt->out_n_analog << 2);
361			*(dest++) = 0xaa;
362			*(dest++) = 0xaa;
363			*(dest++) = frame_count;
364			*(dest++) = 0x00;
365			for (frame = 0; frame < frame_count; frame++)
366				for (channel = 0;
367						channel < rt->out_n_analog;
368						channel++) {
369					dest += 3; /* skip sample data */
370					*(dest++) = 0x40;
371				}
372		}
373	usb_submit_urb(&out_urb->instance, GFP_ATOMIC);
374	usb_submit_urb(&in_urb->instance, GFP_ATOMIC);
375}
376
377static void usb6fire_pcm_out_urb_handler(struct urb *usb_urb)
378{
379	struct pcm_urb *urb = usb_urb->context;
380	struct pcm_runtime *rt = urb->chip->pcm;
381
382	if (rt->stream_state == STREAM_STARTING) {
383		rt->stream_wait_cond = true;
384		wake_up(&rt->stream_wait_queue);
385	}
386}
387
388static int usb6fire_pcm_open(struct snd_pcm_substream *alsa_sub)
389{
390	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
391	struct pcm_substream *sub = NULL;
392	struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
393
394	if (rt->panic)
395		return -EPIPE;
396
397	guard(mutex)(&rt->stream_mutex);
398	alsa_rt->hw = pcm_hw;
399
400	if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK) {
401		if (rt->rate < ARRAY_SIZE(rates))
402			alsa_rt->hw.rates = rates_alsaid[rt->rate];
403		alsa_rt->hw.channels_max = OUT_N_CHANNELS;
404		sub = &rt->playback;
405	} else if (alsa_sub->stream == SNDRV_PCM_STREAM_CAPTURE) {
406		if (rt->rate < ARRAY_SIZE(rates))
407			alsa_rt->hw.rates = rates_alsaid[rt->rate];
408		alsa_rt->hw.channels_max = IN_N_CHANNELS;
409		sub = &rt->capture;
410	}
411
412	if (!sub) {
413		dev_err(&rt->chip->dev->dev, "invalid stream type.\n");
414		return -EINVAL;
415	}
416
417	sub->instance = alsa_sub;
418	sub->active = false;
419	return 0;
420}
421
422static int usb6fire_pcm_close(struct snd_pcm_substream *alsa_sub)
423{
424	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
425	struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
426
427	if (rt->panic)
428		return 0;
429
430	guard(mutex)(&rt->stream_mutex);
431	if (sub) {
432		/* deactivate substream */
433		scoped_guard(spinlock_irqsave, &sub->lock) {
434			sub->instance = NULL;
435			sub->active = false;
436		}
437
438		/* all substreams closed? if so, stop streaming */
439		if (!rt->playback.instance && !rt->capture.instance) {
440			usb6fire_pcm_stream_stop(rt);
441			rt->rate = ARRAY_SIZE(rates);
442		}
443	}
444	return 0;
445}
446
447static int usb6fire_pcm_prepare(struct snd_pcm_substream *alsa_sub)
448{
449	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
450	struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
451	struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
452	int ret;
453
454	if (rt->panic)
455		return -EPIPE;
456	if (!sub)
457		return -ENODEV;
458
459	guard(mutex)(&rt->stream_mutex);
460	sub->dma_off = 0;
461	sub->period_off = 0;
462
463	if (rt->stream_state == STREAM_DISABLED) {
464		for (rt->rate = 0; rt->rate < ARRAY_SIZE(rates); rt->rate++)
465			if (alsa_rt->rate == rates[rt->rate])
466				break;
467		if (rt->rate == ARRAY_SIZE(rates)) {
468			dev_err(&rt->chip->dev->dev,
469				"invalid rate %d in prepare.\n",
470				alsa_rt->rate);
471			return -EINVAL;
472		}
473
474		ret = usb6fire_pcm_set_rate(rt);
475		if (ret)
476			return ret;
477		ret = usb6fire_pcm_stream_start(rt);
478		if (ret) {
479			dev_err(&rt->chip->dev->dev,
480				"could not start pcm stream.\n");
481			return ret;
482		}
483	}
484	return 0;
485}
486
487static int usb6fire_pcm_trigger(struct snd_pcm_substream *alsa_sub, int cmd)
488{
489	struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
490	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
491
492	if (rt->panic)
493		return -EPIPE;
494	if (!sub)
495		return -ENODEV;
496
497	guard(spinlock_irqsave)(&sub->lock);
498	switch (cmd) {
499	case SNDRV_PCM_TRIGGER_START:
500	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
501		sub->active = true;
502		return 0;
503
504	case SNDRV_PCM_TRIGGER_STOP:
505	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
506		sub->active = false;
507		return 0;
508
509	default:
510		return -EINVAL;
511	}
512}
513
514static snd_pcm_uframes_t usb6fire_pcm_pointer(
515		struct snd_pcm_substream *alsa_sub)
516{
517	struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
518	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
519	snd_pcm_uframes_t ret;
520
521	if (rt->panic || !sub)
522		return SNDRV_PCM_POS_XRUN;
523
524	guard(spinlock_irqsave)(&sub->lock);
525	ret = sub->dma_off;
526	return ret;
527}
528
529static const struct snd_pcm_ops pcm_ops = {
530	.open = usb6fire_pcm_open,
531	.close = usb6fire_pcm_close,
532	.prepare = usb6fire_pcm_prepare,
533	.trigger = usb6fire_pcm_trigger,
534	.pointer = usb6fire_pcm_pointer,
535};
536
537static void usb6fire_pcm_init_urb(struct pcm_urb *urb,
538				  struct sfire_chip *chip, bool in, int ep,
539				  void (*handler)(struct urb *))
540{
541	urb->chip = chip;
542	usb_init_urb(&urb->instance);
543	urb->instance.transfer_buffer = urb->buffer;
544	urb->instance.transfer_buffer_length =
545			PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE;
546	urb->instance.dev = chip->dev;
547	urb->instance.pipe = in ? usb_rcvisocpipe(chip->dev, ep)
548			: usb_sndisocpipe(chip->dev, ep);
549	urb->instance.interval = 1;
550	urb->instance.complete = handler;
551	urb->instance.context = urb;
552	urb->instance.number_of_packets = PCM_N_PACKETS_PER_URB;
553}
554
555static int usb6fire_pcm_buffers_init(struct pcm_runtime *rt)
556{
557	int i;
558
559	for (i = 0; i < PCM_N_URBS; i++) {
560		rt->out_urbs[i].buffer = kcalloc(PCM_MAX_PACKET_SIZE,
561						 PCM_N_PACKETS_PER_URB,
562						 GFP_KERNEL);
563		if (!rt->out_urbs[i].buffer)
564			return -ENOMEM;
565		rt->in_urbs[i].buffer = kcalloc(PCM_MAX_PACKET_SIZE,
566						PCM_N_PACKETS_PER_URB,
567						GFP_KERNEL);
568		if (!rt->in_urbs[i].buffer)
569			return -ENOMEM;
570	}
571	return 0;
572}
573
574static void usb6fire_pcm_buffers_destroy(struct pcm_runtime *rt)
575{
576	int i;
577
578	for (i = 0; i < PCM_N_URBS; i++) {
579		kfree(rt->out_urbs[i].buffer);
580		kfree(rt->in_urbs[i].buffer);
581	}
582}
583
584int usb6fire_pcm_init(struct sfire_chip *chip)
585{
586	int i;
587	int ret;
588	struct snd_pcm *pcm;
589	struct pcm_runtime *rt =
590			kzalloc(sizeof(struct pcm_runtime), GFP_KERNEL);
591
592	if (!rt)
593		return -ENOMEM;
594
595	ret = usb6fire_pcm_buffers_init(rt);
596	if (ret) {
597		usb6fire_pcm_buffers_destroy(rt);
598		kfree(rt);
599		return ret;
600	}
601
602	rt->chip = chip;
603	rt->stream_state = STREAM_DISABLED;
604	rt->rate = ARRAY_SIZE(rates);
605	init_waitqueue_head(&rt->stream_wait_queue);
606	mutex_init(&rt->stream_mutex);
607
608	spin_lock_init(&rt->playback.lock);
609	spin_lock_init(&rt->capture.lock);
610
611	for (i = 0; i < PCM_N_URBS; i++) {
612		usb6fire_pcm_init_urb(&rt->in_urbs[i], chip, true, IN_EP,
613				usb6fire_pcm_in_urb_handler);
614		usb6fire_pcm_init_urb(&rt->out_urbs[i], chip, false, OUT_EP,
615				usb6fire_pcm_out_urb_handler);
616
617		rt->in_urbs[i].peer = &rt->out_urbs[i];
618		rt->out_urbs[i].peer = &rt->in_urbs[i];
619	}
620
621	ret = snd_pcm_new(chip->card, "DMX6FireUSB", 0, 1, 1, &pcm);
622	if (ret < 0) {
623		usb6fire_pcm_buffers_destroy(rt);
624		kfree(rt);
625		dev_err(&chip->dev->dev, "cannot create pcm instance.\n");
626		return ret;
627	}
628
629	pcm->private_data = rt;
630	strscpy(pcm->name, "DMX 6Fire USB");
631	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops);
632	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_ops);
633	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
634
635	rt->instance = pcm;
636
637	chip->pcm = rt;
638	return 0;
639}
640
641void usb6fire_pcm_abort(struct sfire_chip *chip)
642{
643	struct pcm_runtime *rt = chip->pcm;
644	int i;
645
646	if (rt) {
647		rt->panic = true;
648
649		if (rt->playback.instance)
650			snd_pcm_stop_xrun(rt->playback.instance);
651
652		if (rt->capture.instance)
653			snd_pcm_stop_xrun(rt->capture.instance);
654
655		for (i = 0; i < PCM_N_URBS; i++) {
656			usb_poison_urb(&rt->in_urbs[i].instance);
657			usb_poison_urb(&rt->out_urbs[i].instance);
658		}
659
660	}
661}
662
663void usb6fire_pcm_destroy(struct sfire_chip *chip)
664{
665	struct pcm_runtime *rt = chip->pcm;
666
667	usb6fire_pcm_buffers_destroy(rt);
668	kfree(rt);
669	chip->pcm = NULL;
670}