[mirror_ubuntu-hirsute-kernel.git] / drivers / media / pci / ivtv / ivtv-alsa-pcm.c

/*
 *  ALSA PCM device for the
 *  ALSA interface to ivtv PCM capture streams
 *
 *  Copyright (C) 2009,2012  Andy Walls <awalls@md.metrocast.net>
 *  Copyright (C) 2009  Devin Heitmueller <dheitmueller@kernellabs.com>
 *
 *  Portions of this work were sponsored by ONELAN Limited for the cx18 driver
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>

#include <media/v4l2-device.h>

#include <sound/core.h>
#include <sound/pcm.h>

#include "ivtv-driver.h"
#include "ivtv-queue.h"
#include "ivtv-streams.h"
#include "ivtv-fileops.h"
#include "ivtv-alsa.h"
#include "ivtv-alsa-pcm.h"

static unsigned int pcm_debug;
module_param(pcm_debug, int, 0644);
MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");

#define dprintk(fmt, arg...) \
	do { \
		if (pcm_debug) \
			pr_info("ivtv-alsa-pcm %s: " fmt, __func__, ##arg); \
	} while (0)

static struct snd_pcm_hardware snd_ivtv_hw_capture = {
	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP           |
		SNDRV_PCM_INFO_INTERLEAVED    |
		SNDRV_PCM_INFO_MMAP_VALID,

	.formats = SNDRV_PCM_FMTBIT_S16_LE,

	.rates = SNDRV_PCM_RATE_48000,

	.rate_min = 48000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = 62720 * 8,	/* just about the value in usbaudio.c */
	.period_bytes_min = 64,		/* 12544/2, */
	.period_bytes_max = 12544,
	.periods_min = 2,
	.periods_max = 98,		/* 12544, */
};

static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc,
					u8 *pcm_data,
					size_t num_bytes)
{
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
	unsigned int oldptr;
	unsigned int stride;
	int period_elapsed = 0;
	int length;

	dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc,
		pcm_data, num_bytes);

	substream = itvsc->capture_pcm_substream;
	if (substream == NULL) {
		dprintk("substream was NULL\n");
		return;
	}

	runtime = substream->runtime;
	if (runtime == NULL) {
		dprintk("runtime was NULL\n");
		return;
	}

	stride = runtime->frame_bits >> 3;
	if (stride == 0) {
		dprintk("stride is zero\n");
		return;
	}

	length = num_bytes / stride;
	if (length == 0) {
		dprintk("%s: length was zero\n", __func__);
		return;
	}

	if (runtime->dma_area == NULL) {
		dprintk("dma area was NULL - ignoring\n");
		return;
	}

	oldptr = itvsc->hwptr_done_capture;
	if (oldptr + length >= runtime->buffer_size) {
		unsigned int cnt =
			runtime->buffer_size - oldptr;
		memcpy(runtime->dma_area + oldptr * stride, pcm_data,
		       cnt * stride);
		memcpy(runtime->dma_area, pcm_data + cnt * stride,
		       length * stride - cnt * stride);
	} else {
		memcpy(runtime->dma_area + oldptr * stride, pcm_data,
		       length * stride);
	}
	snd_pcm_stream_lock(substream);

	itvsc->hwptr_done_capture += length;
	if (itvsc->hwptr_done_capture >=
	    runtime->buffer_size)
		itvsc->hwptr_done_capture -=
			runtime->buffer_size;

	itvsc->capture_transfer_done += length;
	if (itvsc->capture_transfer_done >=
	    runtime->period_size) {
		itvsc->capture_transfer_done -=
			runtime->period_size;
		period_elapsed = 1;
	}

	snd_pcm_stream_unlock(substream);

	if (period_elapsed)
		snd_pcm_period_elapsed(substream);
}

static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
	struct ivtv *itv = to_ivtv(v4l2_dev);
	struct ivtv_stream *s;
	struct ivtv_open_id item;
	int ret;

	/* Instruct the CX2341[56] to start sending packets */
	snd_ivtv_lock(itvsc);

	if (ivtv_init_on_first_open(itv)) {
		snd_ivtv_unlock(itvsc);
		return -ENXIO;
	}

	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];

	v4l2_fh_init(&item.fh, &s->vdev);
	item.itv = itv;
	item.type = s->type;

	/* See if the stream is available */
	if (ivtv_claim_stream(&item, item.type)) {
		/* No, it's already in use */
		snd_ivtv_unlock(itvsc);
		return -EBUSY;
	}

	if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) ||
	    test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
		/* We're already streaming.  No additional action required */
		snd_ivtv_unlock(itvsc);
		return 0;
	}


	runtime->hw = snd_ivtv_hw_capture;
	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	itvsc->capture_pcm_substream = substream;
	runtime->private_data = itv;

	itv->pcm_announce_callback = ivtv_alsa_announce_pcm_data;

	/* Not currently streaming, so start it up */
	set_bit(IVTV_F_S_STREAMING, &s->s_flags);
	ret = ivtv_start_v4l2_encode_stream(s);
	snd_ivtv_unlock(itvsc);

	return ret;
}

static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream)
{
	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
	struct ivtv *itv = to_ivtv(v4l2_dev);
	struct ivtv_stream *s;

	/* Instruct the ivtv to stop sending packets */
	snd_ivtv_lock(itvsc);
	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
	ivtv_stop_v4l2_encode_stream(s, 0);
	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);

	ivtv_release_stream(s);

	itv->pcm_announce_callback = NULL;
	snd_ivtv_unlock(itvsc);

	return 0;
}

static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream,
		     unsigned int cmd, void *arg)
{
	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	int ret;

	snd_ivtv_lock(itvsc);
	ret = snd_pcm_lib_ioctl(substream, cmd, arg);
	snd_ivtv_unlock(itvsc);
	return ret;
}


static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
					size_t size)
{
	struct snd_pcm_runtime *runtime = subs->runtime;

	dprintk("Allocating vbuffer\n");
	if (runtime->dma_area) {
		if (runtime->dma_bytes > size)
			return 0;

		vfree(runtime->dma_area);
	}
	runtime->dma_area = vmalloc(size);
	if (!runtime->dma_area)
		return -ENOMEM;

	runtime->dma_bytes = size;

	return 0;
}

static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *params)
{
	dprintk("%s called\n", __func__);

	return snd_pcm_alloc_vmalloc_buffer(substream,
					   params_buffer_bytes(params));
}

static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	unsigned long flags;

	spin_lock_irqsave(&itvsc->slock, flags);
	if (substream->runtime->dma_area) {
		dprintk("freeing pcm capture region\n");
		vfree(substream->runtime->dma_area);
		substream->runtime->dma_area = NULL;
	}
	spin_unlock_irqrestore(&itvsc->slock, flags);

	return 0;
}

static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);

	itvsc->hwptr_done_capture = 0;
	itvsc->capture_transfer_done = 0;

	return 0;
}

static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	return 0;
}

static
snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream)
{
	unsigned long flags;
	snd_pcm_uframes_t hwptr_done;
	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);

	spin_lock_irqsave(&itvsc->slock, flags);
	hwptr_done = itvsc->hwptr_done_capture;
	spin_unlock_irqrestore(&itvsc->slock, flags);

	return hwptr_done;
}

static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
					     unsigned long offset)
{
	void *pageptr = subs->runtime->dma_area + offset;

	return vmalloc_to_page(pageptr);
}

static const struct snd_pcm_ops snd_ivtv_pcm_capture_ops = {
	.open		= snd_ivtv_pcm_capture_open,
	.close		= snd_ivtv_pcm_capture_close,
	.ioctl		= snd_ivtv_pcm_ioctl,
	.hw_params	= snd_ivtv_pcm_hw_params,
	.hw_free	= snd_ivtv_pcm_hw_free,
	.prepare	= snd_ivtv_pcm_prepare,
	.trigger	= snd_ivtv_pcm_trigger,
	.pointer	= snd_ivtv_pcm_pointer,
	.page		= snd_pcm_get_vmalloc_page,
};

int snd_ivtv_pcm_create(struct snd_ivtv_card *itvsc)
{
	struct snd_pcm *sp;
	struct snd_card *sc = itvsc->sc;
	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
	struct ivtv *itv = to_ivtv(v4l2_dev);
	int ret;

	ret = snd_pcm_new(sc, "CX2341[56] PCM",
			  0, /* PCM device 0, the only one for this card */
			  0, /* 0 playback substreams */
			  1, /* 1 capture substream */
			  &sp);
	if (ret) {
		IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
			      __func__, ret);
		goto err_exit;
	}

	spin_lock_init(&itvsc->slock);

	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
			&snd_ivtv_pcm_capture_ops);
	sp->info_flags = 0;
	sp->private_data = itvsc;
	strlcpy(sp->name, itv->card_name, sizeof(sp->name));

	return 0;

err_exit:
	return ret;
}
Commit	Line	Data
269c11fb AW	1	/*
	2	* ALSA PCM device for the
	3	* ALSA interface to ivtv PCM capture streams
	4	*
	5	* Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
	6	* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
	7	*
	8	* Portions of this work were sponsored by ONELAN Limited for the cx18 driver
	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	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
269c11fb AW	19	*/
	20
	21	#include <linux/init.h>
	22	#include <linux/kernel.h>
	23	#include <linux/vmalloc.h>
269c11fb AW	24
	25	#include <media/v4l2-device.h>
	26
	27	#include <sound/core.h>
	28	#include <sound/pcm.h>
	29
	30	#include "ivtv-driver.h"
	31	#include "ivtv-queue.h"
	32	#include "ivtv-streams.h"
	33	#include "ivtv-fileops.h"
	34	#include "ivtv-alsa.h"
2aebbf67	35	#include "ivtv-alsa-pcm.h"
269c11fb AW	36
	37	static unsigned int pcm_debug;
	38	module_param(pcm_debug, int, 0644);
	39	MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
	40
	41	#define dprintk(fmt, arg...) \
	42	do { \
	43	if (pcm_debug) \
	44	pr_info("ivtv-alsa-pcm %s: " fmt, __func__, ##arg); \
	45	} while (0)
	46
	47	static struct snd_pcm_hardware snd_ivtv_hw_capture = {
	48	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	49	SNDRV_PCM_INFO_MMAP \|
	50	SNDRV_PCM_INFO_INTERLEAVED \|
	51	SNDRV_PCM_INFO_MMAP_VALID,
	52
	53	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	54
	55	.rates = SNDRV_PCM_RATE_48000,
	56
	57	.rate_min = 48000,
	58	.rate_max = 48000,
	59	.channels_min = 2,
	60	.channels_max = 2,
	61	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	62	.period_bytes_min = 64, /* 12544/2, */
	63	.period_bytes_max = 12544,
	64	.periods_min = 2,
	65	.periods_max = 98, /* 12544, */
	66	};
	67
2aebbf67 MCC	68	static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc,
	69	u8 *pcm_data,
	70	size_t num_bytes)
269c11fb AW	71	{
	72	struct snd_pcm_substream *substream;
	73	struct snd_pcm_runtime *runtime;
	74	unsigned int oldptr;
	75	unsigned int stride;
	76	int period_elapsed = 0;
	77	int length;
	78
339f06c5	79	dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc,
269c11fb AW	80	pcm_data, num_bytes);
	81
	82	substream = itvsc->capture_pcm_substream;
	83	if (substream == NULL) {
	84	dprintk("substream was NULL\n");
	85	return;
	86	}
	87
	88	runtime = substream->runtime;
	89	if (runtime == NULL) {
	90	dprintk("runtime was NULL\n");
	91	return;
	92	}
	93
	94	stride = runtime->frame_bits >> 3;
	95	if (stride == 0) {
	96	dprintk("stride is zero\n");
	97	return;
	98	}
	99
	100	length = num_bytes / stride;
	101	if (length == 0) {
	102	dprintk("%s: length was zero\n", __func__);
	103	return;
	104	}
	105
	106	if (runtime->dma_area == NULL) {
	107	dprintk("dma area was NULL - ignoring\n");
	108	return;
	109	}
	110
	111	oldptr = itvsc->hwptr_done_capture;
	112	if (oldptr + length >= runtime->buffer_size) {
	113	unsigned int cnt =
	114	runtime->buffer_size - oldptr;
	115	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	116	cnt * stride);
	117	memcpy(runtime->dma_area, pcm_data + cnt * stride,
	118	length * stride - cnt * stride);
	119	} else {
	120	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	121	length * stride);
	122	}
	123	snd_pcm_stream_lock(substream);
	124
	125	itvsc->hwptr_done_capture += length;
	126	if (itvsc->hwptr_done_capture >=
	127	runtime->buffer_size)
	128	itvsc->hwptr_done_capture -=
	129	runtime->buffer_size;
	130
	131	itvsc->capture_transfer_done += length;
	132	if (itvsc->capture_transfer_done >=
	133	runtime->period_size) {
	134	itvsc->capture_transfer_done -=
	135	runtime->period_size;
	136	period_elapsed = 1;
	137	}
	138
	139	snd_pcm_stream_unlock(substream);
	140
	141	if (period_elapsed)
	142	snd_pcm_period_elapsed(substream);
	143	}
144
145	static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream)
146	{
147	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
148	struct snd_pcm_runtime *runtime = substream->runtime;
149	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
150	struct ivtv *itv = to_ivtv(v4l2_dev);
151	struct ivtv_stream *s;
152	struct ivtv_open_id item;
153	int ret;
154
155	/* Instruct the CX2341[56] to start sending packets */
156	snd_ivtv_lock(itvsc);
deb29e90 TI	157
	158	if (ivtv_init_on_first_open(itv)) {
	159	snd_ivtv_unlock(itvsc);
	160	return -ENXIO;
	161	}
	162
269c11fb AW	163	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
269c11fb AW	164
635d62f0	165	v4l2_fh_init(&item.fh, &s->vdev);
269c11fb AW	166	item.itv = itv;
	167	item.type = s->type;
	168
	169	/* See if the stream is available */
	170	if (ivtv_claim_stream(&item, item.type)) {
	171	/* No, it's already in use */
	172	snd_ivtv_unlock(itvsc);
	173	return -EBUSY;
	174	}
	175
	176	if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) \|\|
	177	test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
	178	/* We're already streaming. No additional action required */
	179	snd_ivtv_unlock(itvsc);
	180	return 0;
	181	}
	182
	183
	184	runtime->hw = snd_ivtv_hw_capture;
	185	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	186	itvsc->capture_pcm_substream = substream;
	187	runtime->private_data = itv;
	188
	189	itv->pcm_announce_callback = ivtv_alsa_announce_pcm_data;
	190
	191	/* Not currently streaming, so start it up */
	192	set_bit(IVTV_F_S_STREAMING, &s->s_flags);
	193	ret = ivtv_start_v4l2_encode_stream(s);
	194	snd_ivtv_unlock(itvsc);
	195
	196	return ret;
	197	}
	198
	199	static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream)
	200	{
	201	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	202	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
	203	struct ivtv *itv = to_ivtv(v4l2_dev);
	204	struct ivtv_stream *s;
	205
	206	/* Instruct the ivtv to stop sending packets */
	207	snd_ivtv_lock(itvsc);
	208	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
	209	ivtv_stop_v4l2_encode_stream(s, 0);
	210	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
	211
	212	ivtv_release_stream(s);
	213
	214	itv->pcm_announce_callback = NULL;
	215	snd_ivtv_unlock(itvsc);
	216
	217	return 0;
	218	}
	219
	220	static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream,
	221	unsigned int cmd, void *arg)
	222	{
	223	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	224	int ret;
	225
	226	snd_ivtv_lock(itvsc);
	227	ret = snd_pcm_lib_ioctl(substream, cmd, arg);
	228	snd_ivtv_unlock(itvsc);
	229	return ret;
230	}
231
232
233	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
234	size_t size)
235	{
236	struct snd_pcm_runtime *runtime = subs->runtime;
237
238	dprintk("Allocating vbuffer\n");
239	if (runtime->dma_area) {
240	if (runtime->dma_bytes > size)
241	return 0;
242
243	vfree(runtime->dma_area);
244	}
245	runtime->dma_area = vmalloc(size);
246	if (!runtime->dma_area)
247	return -ENOMEM;
248
249	runtime->dma_bytes = size;
250
251	return 0;
252	}
253
254	static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream,
255	struct snd_pcm_hw_params *params)
256	{
257	dprintk("%s called\n", __func__);
258
259	return snd_pcm_alloc_vmalloc_buffer(substream,
260	params_buffer_bytes(params));
261	}
262
263	static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream)
264	{
265	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
266	unsigned long flags;
267
268	spin_lock_irqsave(&itvsc->slock, flags);
269	if (substream->runtime->dma_area) {
270	dprintk("freeing pcm capture region\n");
271	vfree(substream->runtime->dma_area);
272	substream->runtime->dma_area = NULL;
273	}
274	spin_unlock_irqrestore(&itvsc->slock, flags);
275
276	return 0;
277	}
278
279	static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream)
280	{
281	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
282
283	itvsc->hwptr_done_capture = 0;
284	itvsc->capture_transfer_done = 0;
285
286	return 0;
287	}
288
289	static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
290	{
291	return 0;
292	}
293
294	static
295	snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream)
296	{
297	unsigned long flags;
298	snd_pcm_uframes_t hwptr_done;
299	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
300
301	spin_lock_irqsave(&itvsc->slock, flags);
302	hwptr_done = itvsc->hwptr_done_capture;
303	spin_unlock_irqrestore(&itvsc->slock, flags);
304
305	return hwptr_done;
306	}
307
308	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
309	unsigned long offset)
310	{
311	void *pageptr = subs->runtime->dma_area + offset;
312
313	return vmalloc_to_page(pageptr);
314	}
315
5c8d8c01	316	static const struct snd_pcm_ops snd_ivtv_pcm_capture_ops = {
269c11fb AW	317	.open = snd_ivtv_pcm_capture_open,
	318	.close = snd_ivtv_pcm_capture_close,
	319	.ioctl = snd_ivtv_pcm_ioctl,
	320	.hw_params = snd_ivtv_pcm_hw_params,
	321	.hw_free = snd_ivtv_pcm_hw_free,
	322	.prepare = snd_ivtv_pcm_prepare,
	323	.trigger = snd_ivtv_pcm_trigger,
	324	.pointer = snd_ivtv_pcm_pointer,
	325	.page = snd_pcm_get_vmalloc_page,
	326	};
	327
	328	int snd_ivtv_pcm_create(struct snd_ivtv_card *itvsc)
	329	{
	330	struct snd_pcm *sp;
	331	struct snd_card *sc = itvsc->sc;
	332	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
	333	struct ivtv *itv = to_ivtv(v4l2_dev);
	334	int ret;
	335
	336	ret = snd_pcm_new(sc, "CX2341[56] PCM",
	337	0, /* PCM device 0, the only one for this card */
	338	0, /* 0 playback substreams */
	339	1, /* 1 capture substream */
	340	&sp);
	341	if (ret) {
	342	IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
	343	__func__, ret);
	344	goto err_exit;
	345	}
	346
	347	spin_lock_init(&itvsc->slock);
	348
	349	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
	350	&snd_ivtv_pcm_capture_ops);
	351	sp->info_flags = 0;
	352	sp->private_data = itvsc;
	353	strlcpy(sp->name, itv->card_name, sizeof(sp->name));
	354
	355	return 0;
	356
	357	err_exit:
	358	return ret;
	359	}