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

#include <linux/vmalloc.h>

#include <sound/core.h>
#include <sound/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 */
		v4l2_fh_exit(&item.fh);
		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	*/
269c11fb AW	20
269c11fb AW	21	#include "ivtv-driver.h"
	22	#include "ivtv-queue.h"
	23	#include "ivtv-streams.h"
	24	#include "ivtv-fileops.h"
	25	#include "ivtv-alsa.h"
2aebbf67	26	#include "ivtv-alsa-pcm.h"
269c11fb	27
bbdba43f MCC	28	#include <linux/vmalloc.h>
	29
	30	#include <sound/core.h>
	31	#include <sound/pcm.h>
	32
	33
269c11fb AW	34	static unsigned int pcm_debug;
	35	module_param(pcm_debug, int, 0644);
	36	MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
	37
	38	#define dprintk(fmt, arg...) \
	39	do { \
	40	if (pcm_debug) \
	41	pr_info("ivtv-alsa-pcm %s: " fmt, __func__, ##arg); \
	42	} while (0)
	43
	44	static struct snd_pcm_hardware snd_ivtv_hw_capture = {
	45	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	46	SNDRV_PCM_INFO_MMAP \|
	47	SNDRV_PCM_INFO_INTERLEAVED \|
	48	SNDRV_PCM_INFO_MMAP_VALID,
	49
	50	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	51
	52	.rates = SNDRV_PCM_RATE_48000,
	53
	54	.rate_min = 48000,
	55	.rate_max = 48000,
	56	.channels_min = 2,
	57	.channels_max = 2,
	58	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	59	.period_bytes_min = 64, /* 12544/2, */
	60	.period_bytes_max = 12544,
	61	.periods_min = 2,
	62	.periods_max = 98, /* 12544, */
	63	};
	64
2aebbf67 MCC	65	static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc,
	66	u8 *pcm_data,
	67	size_t num_bytes)
269c11fb AW	68	{
	69	struct snd_pcm_substream *substream;
	70	struct snd_pcm_runtime *runtime;
	71	unsigned int oldptr;
	72	unsigned int stride;
	73	int period_elapsed = 0;
	74	int length;
	75
339f06c5	76	dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc,
269c11fb AW	77	pcm_data, num_bytes);
	78
	79	substream = itvsc->capture_pcm_substream;
	80	if (substream == NULL) {
	81	dprintk("substream was NULL\n");
	82	return;
	83	}
	84
	85	runtime = substream->runtime;
	86	if (runtime == NULL) {
	87	dprintk("runtime was NULL\n");
	88	return;
	89	}
	90
	91	stride = runtime->frame_bits >> 3;
	92	if (stride == 0) {
	93	dprintk("stride is zero\n");
	94	return;
	95	}
	96
	97	length = num_bytes / stride;
	98	if (length == 0) {
	99	dprintk("%s: length was zero\n", __func__);
	100	return;
	101	}
	102
	103	if (runtime->dma_area == NULL) {
	104	dprintk("dma area was NULL - ignoring\n");
	105	return;
	106	}
	107
	108	oldptr = itvsc->hwptr_done_capture;
	109	if (oldptr + length >= runtime->buffer_size) {
	110	unsigned int cnt =
	111	runtime->buffer_size - oldptr;
	112	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	113	cnt * stride);
	114	memcpy(runtime->dma_area, pcm_data + cnt * stride,
	115	length * stride - cnt * stride);
	116	} else {
	117	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	118	length * stride);
	119	}
	120	snd_pcm_stream_lock(substream);
	121
	122	itvsc->hwptr_done_capture += length;
	123	if (itvsc->hwptr_done_capture >=
	124	runtime->buffer_size)
	125	itvsc->hwptr_done_capture -=
	126	runtime->buffer_size;
	127
	128	itvsc->capture_transfer_done += length;
	129	if (itvsc->capture_transfer_done >=
	130	runtime->period_size) {
	131	itvsc->capture_transfer_done -=
	132	runtime->period_size;
	133	period_elapsed = 1;
	134	}
	135
	136	snd_pcm_stream_unlock(substream);
	137
	138	if (period_elapsed)
	139	snd_pcm_period_elapsed(substream);
	140	}
141
142	static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream)
143	{
144	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
145	struct snd_pcm_runtime *runtime = substream->runtime;
146	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
147	struct ivtv *itv = to_ivtv(v4l2_dev);
148	struct ivtv_stream *s;
149	struct ivtv_open_id item;
150	int ret;
151
152	/* Instruct the CX2341[56] to start sending packets */
153	snd_ivtv_lock(itvsc);
deb29e90 TI	154
	155	if (ivtv_init_on_first_open(itv)) {
	156	snd_ivtv_unlock(itvsc);
	157	return -ENXIO;
	158	}
	159
269c11fb AW	160	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
269c11fb AW	161
635d62f0	162	v4l2_fh_init(&item.fh, &s->vdev);
269c11fb AW	163	item.itv = itv;
	164	item.type = s->type;
	165
	166	/* See if the stream is available */
	167	if (ivtv_claim_stream(&item, item.type)) {
	168	/* No, it's already in use */
c5b81fe3	169	v4l2_fh_exit(&item.fh);
269c11fb AW	170	snd_ivtv_unlock(itvsc);
	171	return -EBUSY;
	172	}
	173
	174	if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) \|\|
	175	test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
	176	/* We're already streaming. No additional action required */
	177	snd_ivtv_unlock(itvsc);
	178	return 0;
	179	}
	180
	181
	182	runtime->hw = snd_ivtv_hw_capture;
	183	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	184	itvsc->capture_pcm_substream = substream;
	185	runtime->private_data = itv;
	186
	187	itv->pcm_announce_callback = ivtv_alsa_announce_pcm_data;
	188
	189	/* Not currently streaming, so start it up */
	190	set_bit(IVTV_F_S_STREAMING, &s->s_flags);
	191	ret = ivtv_start_v4l2_encode_stream(s);
	192	snd_ivtv_unlock(itvsc);
	193
	194	return ret;
	195	}
	196
	197	static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream)
	198	{
	199	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	200	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
	201	struct ivtv *itv = to_ivtv(v4l2_dev);
	202	struct ivtv_stream *s;
	203
	204	/* Instruct the ivtv to stop sending packets */
	205	snd_ivtv_lock(itvsc);
	206	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
	207	ivtv_stop_v4l2_encode_stream(s, 0);
	208	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
	209
	210	ivtv_release_stream(s);
	211
	212	itv->pcm_announce_callback = NULL;
	213	snd_ivtv_unlock(itvsc);
	214
	215	return 0;
	216	}
	217
	218	static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream,
	219	unsigned int cmd, void *arg)
	220	{
	221	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
	222	int ret;
	223
	224	snd_ivtv_lock(itvsc);
	225	ret = snd_pcm_lib_ioctl(substream, cmd, arg);
	226	snd_ivtv_unlock(itvsc);
	227	return ret;
	228	}
	229
	230
	231	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	232	size_t size)
	233	{
234	struct snd_pcm_runtime *runtime = subs->runtime;
235
236	dprintk("Allocating vbuffer\n");
237	if (runtime->dma_area) {
238	if (runtime->dma_bytes > size)
239	return 0;
240
241	vfree(runtime->dma_area);
242	}
243	runtime->dma_area = vmalloc(size);
244	if (!runtime->dma_area)
245	return -ENOMEM;
246
247	runtime->dma_bytes = size;
248
249	return 0;
250	}
251
252	static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream,
253	struct snd_pcm_hw_params *params)
254	{
255	dprintk("%s called\n", __func__);
256
257	return snd_pcm_alloc_vmalloc_buffer(substream,
258	params_buffer_bytes(params));
259	}
260
261	static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream)
262	{
263	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
264	unsigned long flags;
265
266	spin_lock_irqsave(&itvsc->slock, flags);
267	if (substream->runtime->dma_area) {
268	dprintk("freeing pcm capture region\n");
269	vfree(substream->runtime->dma_area);
270	substream->runtime->dma_area = NULL;
271	}
272	spin_unlock_irqrestore(&itvsc->slock, flags);
273
274	return 0;
275	}
276
277	static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream)
278	{
279	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
280
281	itvsc->hwptr_done_capture = 0;
282	itvsc->capture_transfer_done = 0;
283
284	return 0;
285	}
286
287	static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
288	{
289	return 0;
290	}
291
292	static
293	snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream)
294	{
295	unsigned long flags;
296	snd_pcm_uframes_t hwptr_done;
297	struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
298
299	spin_lock_irqsave(&itvsc->slock, flags);
300	hwptr_done = itvsc->hwptr_done_capture;
301	spin_unlock_irqrestore(&itvsc->slock, flags);
302
303	return hwptr_done;
304	}
305
306	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
307	unsigned long offset)
308	{
309	void *pageptr = subs->runtime->dma_area + offset;
310
311	return vmalloc_to_page(pageptr);
312	}
313
5c8d8c01	314	static const struct snd_pcm_ops snd_ivtv_pcm_capture_ops = {
269c11fb AW	315	.open = snd_ivtv_pcm_capture_open,
	316	.close = snd_ivtv_pcm_capture_close,
	317	.ioctl = snd_ivtv_pcm_ioctl,
	318	.hw_params = snd_ivtv_pcm_hw_params,
	319	.hw_free = snd_ivtv_pcm_hw_free,
	320	.prepare = snd_ivtv_pcm_prepare,
	321	.trigger = snd_ivtv_pcm_trigger,
	322	.pointer = snd_ivtv_pcm_pointer,
	323	.page = snd_pcm_get_vmalloc_page,
	324	};
	325
	326	int snd_ivtv_pcm_create(struct snd_ivtv_card *itvsc)
	327	{
	328	struct snd_pcm *sp;
	329	struct snd_card *sc = itvsc->sc;
	330	struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
	331	struct ivtv *itv = to_ivtv(v4l2_dev);
	332	int ret;
	333
	334	ret = snd_pcm_new(sc, "CX2341[56] PCM",
	335	0, /* PCM device 0, the only one for this card */
	336	0, /* 0 playback substreams */
	337	1, /* 1 capture substream */
	338	&sp);
	339	if (ret) {
	340	IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
	341	__func__, ret);
	342	goto err_exit;
	343	}
	344
	345	spin_lock_init(&itvsc->slock);
	346
	347	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
	348	&snd_ivtv_pcm_capture_ops);
	349	sp->info_flags = 0;
	350	sp->private_data = itvsc;
	351	strlcpy(sp->name, itv->card_name, sizeof(sp->name));
	352
	353	return 0;
	354
	355	err_exit:
	356	return ret;
	357	}