brintos

brintos / linux-shallow public Read only

0
0
Text · 17.7 KiB · 32c39d8 Raw
684 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Linux driver for TerraTec DMX 6Fire USB4 *5 * PCM driver6 *7 * Author:	Torsten Schenk <torsten.schenk@zoho.com>8 * Created:	Jan 01, 20119 * Copyright:	(C) Torsten Schenk10 */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 = 419};20 21/* keep next two synced with22 * FW_EP_W_MAX_PACKET_SIZE[] and RATES_MAX_PACKET_SIZE23 * 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 * 102434};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_STOPPING41};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 = 102468};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_off202			* (alsa_rt->frame_bits >> 3));203	u32 *dest_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size204			* (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		else214			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		else221			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_off248			* (alsa_rt->frame_bits >> 3));249	u32 *src_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size250			* (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		else270			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	unsigned long flags;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	spin_lock_irqsave(&sub->lock, flags);317	if (sub->active) {318		usb6fire_pcm_capture(sub, in_urb);319		if (sub->period_off >= sub->instance->runtime->period_size) {320			sub->period_off %= sub->instance->runtime->period_size;321			spin_unlock_irqrestore(&sub->lock, flags);322			snd_pcm_period_elapsed(sub->instance);323		} else324			spin_unlock_irqrestore(&sub->lock, flags);325	} else326		spin_unlock_irqrestore(&sub->lock, flags);327 328	/* setup out urb structure */329	for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {330		out_urb->packets[i].offset = total_length;331		out_urb->packets[i].length = (in_urb->packets[i].actual_length332				- 4) / (rt->in_n_analog << 2)333				* (rt->out_n_analog << 2) + 4;334		out_urb->packets[i].status = 0;335		total_length += out_urb->packets[i].length;336	}337	memset(out_urb->buffer, 0, total_length);338 339	/* now send our playback data (if a free out urb was found) */340	sub = &rt->playback;341	spin_lock_irqsave(&sub->lock, flags);342	if (sub->active) {343		usb6fire_pcm_playback(sub, out_urb);344		if (sub->period_off >= sub->instance->runtime->period_size) {345			sub->period_off %= sub->instance->runtime->period_size;346			spin_unlock_irqrestore(&sub->lock, flags);347			snd_pcm_period_elapsed(sub->instance);348		} else349			spin_unlock_irqrestore(&sub->lock, flags);350	} else351		spin_unlock_irqrestore(&sub->lock, flags);352 353	/* setup the 4th byte of each sample (0x40 for analog channels) */354	dest = out_urb->buffer;355	for (i = 0; i < PCM_N_PACKETS_PER_URB; i++)356		if (out_urb->packets[i].length >= 4) {357			frame_count = (out_urb->packets[i].length - 4)358					/ (rt->out_n_analog << 2);359			*(dest++) = 0xaa;360			*(dest++) = 0xaa;361			*(dest++) = frame_count;362			*(dest++) = 0x00;363			for (frame = 0; frame < frame_count; frame++)364				for (channel = 0;365						channel < rt->out_n_analog;366						channel++) {367					dest += 3; /* skip sample data */368					*(dest++) = 0x40;369				}370		}371	usb_submit_urb(&out_urb->instance, GFP_ATOMIC);372	usb_submit_urb(&in_urb->instance, GFP_ATOMIC);373}374 375static void usb6fire_pcm_out_urb_handler(struct urb *usb_urb)376{377	struct pcm_urb *urb = usb_urb->context;378	struct pcm_runtime *rt = urb->chip->pcm;379 380	if (rt->stream_state == STREAM_STARTING) {381		rt->stream_wait_cond = true;382		wake_up(&rt->stream_wait_queue);383	}384}385 386static int usb6fire_pcm_open(struct snd_pcm_substream *alsa_sub)387{388	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);389	struct pcm_substream *sub = NULL;390	struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;391 392	if (rt->panic)393		return -EPIPE;394 395	mutex_lock(&rt->stream_mutex);396	alsa_rt->hw = pcm_hw;397 398	if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK) {399		if (rt->rate < ARRAY_SIZE(rates))400			alsa_rt->hw.rates = rates_alsaid[rt->rate];401		alsa_rt->hw.channels_max = OUT_N_CHANNELS;402		sub = &rt->playback;403	} else if (alsa_sub->stream == SNDRV_PCM_STREAM_CAPTURE) {404		if (rt->rate < ARRAY_SIZE(rates))405			alsa_rt->hw.rates = rates_alsaid[rt->rate];406		alsa_rt->hw.channels_max = IN_N_CHANNELS;407		sub = &rt->capture;408	}409 410	if (!sub) {411		mutex_unlock(&rt->stream_mutex);412		dev_err(&rt->chip->dev->dev, "invalid stream type.\n");413		return -EINVAL;414	}415 416	sub->instance = alsa_sub;417	sub->active = false;418	mutex_unlock(&rt->stream_mutex);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	unsigned long flags;427 428	if (rt->panic)429		return 0;430 431	mutex_lock(&rt->stream_mutex);432	if (sub) {433		/* deactivate substream */434		spin_lock_irqsave(&sub->lock, flags);435		sub->instance = NULL;436		sub->active = false;437		spin_unlock_irqrestore(&sub->lock, flags);438 439		/* all substreams closed? if so, stop streaming */440		if (!rt->playback.instance && !rt->capture.instance) {441			usb6fire_pcm_stream_stop(rt);442			rt->rate = ARRAY_SIZE(rates);443		}444	}445	mutex_unlock(&rt->stream_mutex);446	return 0;447}448 449static int usb6fire_pcm_prepare(struct snd_pcm_substream *alsa_sub)450{451	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);452	struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);453	struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;454	int ret;455 456	if (rt->panic)457		return -EPIPE;458	if (!sub)459		return -ENODEV;460 461	mutex_lock(&rt->stream_mutex);462	sub->dma_off = 0;463	sub->period_off = 0;464 465	if (rt->stream_state == STREAM_DISABLED) {466		for (rt->rate = 0; rt->rate < ARRAY_SIZE(rates); rt->rate++)467			if (alsa_rt->rate == rates[rt->rate])468				break;469		if (rt->rate == ARRAY_SIZE(rates)) {470			mutex_unlock(&rt->stream_mutex);471			dev_err(&rt->chip->dev->dev,472				"invalid rate %d in prepare.\n",473				alsa_rt->rate);474			return -EINVAL;475		}476 477		ret = usb6fire_pcm_set_rate(rt);478		if (ret) {479			mutex_unlock(&rt->stream_mutex);480			return ret;481		}482		ret = usb6fire_pcm_stream_start(rt);483		if (ret) {484			mutex_unlock(&rt->stream_mutex);485			dev_err(&rt->chip->dev->dev,486				"could not start pcm stream.\n");487			return ret;488		}489	}490	mutex_unlock(&rt->stream_mutex);491	return 0;492}493 494static int usb6fire_pcm_trigger(struct snd_pcm_substream *alsa_sub, int cmd)495{496	struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);497	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);498	unsigned long flags;499 500	if (rt->panic)501		return -EPIPE;502	if (!sub)503		return -ENODEV;504 505	switch (cmd) {506	case SNDRV_PCM_TRIGGER_START:507	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:508		spin_lock_irqsave(&sub->lock, flags);509		sub->active = true;510		spin_unlock_irqrestore(&sub->lock, flags);511		return 0;512 513	case SNDRV_PCM_TRIGGER_STOP:514	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:515		spin_lock_irqsave(&sub->lock, flags);516		sub->active = false;517		spin_unlock_irqrestore(&sub->lock, flags);518		return 0;519 520	default:521		return -EINVAL;522	}523}524 525static snd_pcm_uframes_t usb6fire_pcm_pointer(526		struct snd_pcm_substream *alsa_sub)527{528	struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);529	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);530	unsigned long flags;531	snd_pcm_uframes_t ret;532 533	if (rt->panic || !sub)534		return SNDRV_PCM_POS_XRUN;535 536	spin_lock_irqsave(&sub->lock, flags);537	ret = sub->dma_off;538	spin_unlock_irqrestore(&sub->lock, flags);539	return ret;540}541 542static const struct snd_pcm_ops pcm_ops = {543	.open = usb6fire_pcm_open,544	.close = usb6fire_pcm_close,545	.prepare = usb6fire_pcm_prepare,546	.trigger = usb6fire_pcm_trigger,547	.pointer = usb6fire_pcm_pointer,548};549 550static void usb6fire_pcm_init_urb(struct pcm_urb *urb,551				  struct sfire_chip *chip, bool in, int ep,552				  void (*handler)(struct urb *))553{554	urb->chip = chip;555	usb_init_urb(&urb->instance);556	urb->instance.transfer_buffer = urb->buffer;557	urb->instance.transfer_buffer_length =558			PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE;559	urb->instance.dev = chip->dev;560	urb->instance.pipe = in ? usb_rcvisocpipe(chip->dev, ep)561			: usb_sndisocpipe(chip->dev, ep);562	urb->instance.interval = 1;563	urb->instance.complete = handler;564	urb->instance.context = urb;565	urb->instance.number_of_packets = PCM_N_PACKETS_PER_URB;566}567 568static int usb6fire_pcm_buffers_init(struct pcm_runtime *rt)569{570	int i;571 572	for (i = 0; i < PCM_N_URBS; i++) {573		rt->out_urbs[i].buffer = kcalloc(PCM_MAX_PACKET_SIZE,574						 PCM_N_PACKETS_PER_URB,575						 GFP_KERNEL);576		if (!rt->out_urbs[i].buffer)577			return -ENOMEM;578		rt->in_urbs[i].buffer = kcalloc(PCM_MAX_PACKET_SIZE,579						PCM_N_PACKETS_PER_URB,580						GFP_KERNEL);581		if (!rt->in_urbs[i].buffer)582			return -ENOMEM;583	}584	return 0;585}586 587static void usb6fire_pcm_buffers_destroy(struct pcm_runtime *rt)588{589	int i;590 591	for (i = 0; i < PCM_N_URBS; i++) {592		kfree(rt->out_urbs[i].buffer);593		kfree(rt->in_urbs[i].buffer);594	}595}596 597int usb6fire_pcm_init(struct sfire_chip *chip)598{599	int i;600	int ret;601	struct snd_pcm *pcm;602	struct pcm_runtime *rt =603			kzalloc(sizeof(struct pcm_runtime), GFP_KERNEL);604 605	if (!rt)606		return -ENOMEM;607 608	ret = usb6fire_pcm_buffers_init(rt);609	if (ret) {610		usb6fire_pcm_buffers_destroy(rt);611		kfree(rt);612		return ret;613	}614 615	rt->chip = chip;616	rt->stream_state = STREAM_DISABLED;617	rt->rate = ARRAY_SIZE(rates);618	init_waitqueue_head(&rt->stream_wait_queue);619	mutex_init(&rt->stream_mutex);620 621	spin_lock_init(&rt->playback.lock);622	spin_lock_init(&rt->capture.lock);623 624	for (i = 0; i < PCM_N_URBS; i++) {625		usb6fire_pcm_init_urb(&rt->in_urbs[i], chip, true, IN_EP,626				usb6fire_pcm_in_urb_handler);627		usb6fire_pcm_init_urb(&rt->out_urbs[i], chip, false, OUT_EP,628				usb6fire_pcm_out_urb_handler);629 630		rt->in_urbs[i].peer = &rt->out_urbs[i];631		rt->out_urbs[i].peer = &rt->in_urbs[i];632	}633 634	ret = snd_pcm_new(chip->card, "DMX6FireUSB", 0, 1, 1, &pcm);635	if (ret < 0) {636		usb6fire_pcm_buffers_destroy(rt);637		kfree(rt);638		dev_err(&chip->dev->dev, "cannot create pcm instance.\n");639		return ret;640	}641 642	pcm->private_data = rt;643	strcpy(pcm->name, "DMX 6Fire USB");644	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops);645	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_ops);646	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);647 648	rt->instance = pcm;649 650	chip->pcm = rt;651	return 0;652}653 654void usb6fire_pcm_abort(struct sfire_chip *chip)655{656	struct pcm_runtime *rt = chip->pcm;657	int i;658 659	if (rt) {660		rt->panic = true;661 662		if (rt->playback.instance)663			snd_pcm_stop_xrun(rt->playback.instance);664 665		if (rt->capture.instance)666			snd_pcm_stop_xrun(rt->capture.instance);667 668		for (i = 0; i < PCM_N_URBS; i++) {669			usb_poison_urb(&rt->in_urbs[i].instance);670			usb_poison_urb(&rt->out_urbs[i].instance);671		}672 673	}674}675 676void usb6fire_pcm_destroy(struct sfire_chip *chip)677{678	struct pcm_runtime *rt = chip->pcm;679 680	usb6fire_pcm_buffers_destroy(rt);681	kfree(rt);682	chip->pcm = NULL;683}684