[mirror_ubuntu-jammy-kernel.git] / drivers / media / video / cx18 / cx18-alsa-pcm.c

/*
 *  ALSA PCM device for the
 *  ALSA interface to cx18 PCM capture streams
 *
 *  Copyright (C) 2009  Andy Walls <awalls@radix.net>
 *  Copyright (C) 2009  Devin Heitmueller <dheitmueller@kernellabs.com>
 *
 *  Portions of this work were sponsored by ONELAN Limited.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA
 */

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

#include <media/v4l2-device.h>

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

#include "cx18-driver.h"
#include "cx18-queue.h"
#include "cx18-streams.h"
#include "cx18-fileops.h"
#include "cx18-alsa.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)						\
		printk(KERN_INFO "cx18-alsa-pcm %s: " fmt,		\
				  __func__, ##arg); 			\
	} while (0)

/* Forward Declaration */
void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data,
				 size_t num_bytes);

static struct snd_pcm_hardware snd_cx18_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_CONTINUOUS | SNDRV_PCM_RATE_KNOT,

	.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 int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	struct cx18 *cx = to_cx18(v4l2_dev);
	struct cx18_stream *s;
	struct cx18_open_id *item;
	int ret;

	/* Instruct the cx18 to start sending packets */
	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];

	/* Allocate memory */
	item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
	if (NULL == item)
		return -ENOMEM;

	item->cx = cx;
	item->type = s->type;
	item->open_id = cx->open_id++;

	/* See if the stream is available */
	if (cx18_claim_stream(item, item->type)) {
		/* No, it's already in use */
		kfree(item);
		return -EBUSY;
	}

	if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
	    test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
		/* We're already streaming.  No additional action required */
		return 0;
	}


	runtime->hw = snd_cx18_hw_capture;
	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	cxsc->capture_pcm_substream = substream;
	runtime->private_data = cx;

	cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;

	/* Not currently streaming, so start it up */
	set_bit(CX18_F_S_STREAMING, &s->s_flags);
	ret = cx18_start_v4l2_encode_stream(s);

	return 0;
}

static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
{
	unsigned long flags;
	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	struct cx18 *cx = to_cx18(v4l2_dev);
	struct cx18_stream *s;
	int ret;

	/* Instruct the cx18 to stop sending packets */
	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
	ret = cx18_stop_v4l2_encode_stream(s, 0);
	clear_bit(CX18_F_S_STREAMING, &s->s_flags);

	cx18_release_stream(s);

	cx->pcm_announce_callback = NULL;

	spin_lock_irqsave(&cxsc->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(&cxsc->slock, flags);

	return 0;
}

static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream,
		     unsigned int cmd, void *arg)
{
	return snd_pcm_lib_ioctl(substream, cmd, arg);
}


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_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *params)
{
	int ret;

	dprintk("%s called\n", __func__);

	ret = snd_pcm_alloc_vmalloc_buffer(substream,
					   params_buffer_bytes(params));
	return 0;
}

static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream)
{
	return 0;
}

static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);

	cxsc->hwptr_done_capture = 0;
	cxsc->capture_transfer_done = 0;

	return 0;
}

static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	return 0;
}

static
snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
{
	unsigned long flags;
	snd_pcm_uframes_t hwptr_done;
	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);

	spin_lock_irqsave(&cxsc->slock, flags);
	hwptr_done = cxsc->hwptr_done_capture;
	spin_unlock_irqrestore(&cxsc->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 struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
	.open		= snd_cx18_pcm_capture_open,
	.close		= snd_cx18_pcm_capture_close,
	.ioctl		= snd_cx18_pcm_ioctl,
	.hw_params	= snd_cx18_pcm_hw_params,
	.hw_free	= snd_cx18_pcm_hw_free,
	.prepare	= snd_cx18_pcm_prepare,
	.trigger	= snd_cx18_pcm_trigger,
	.pointer	= snd_cx18_pcm_pointer,
	.page		= snd_pcm_get_vmalloc_page,
};

void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, 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("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc,
		pcm_data, num_bytes);

	substream = cxsc->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 = cxsc->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);

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

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

	snd_pcm_stream_unlock(substream);

	if (period_elapsed)
		snd_pcm_period_elapsed(substream);
}

int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
{
	struct snd_pcm *sp;
	struct snd_card *sc = cxsc->sc;
	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	struct cx18 *cx = to_cx18(v4l2_dev);
	int ret;

	ret = snd_pcm_new(sc, "CX23418 PCM",
			  0, /* PCM device 0, the only one for this card */
			  0, /* 0 playback substreams */
			  1, /* 1 capture substream */
			  &sp);
	if (ret) {
		CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
			      __func__, ret);
		goto err_exit;
	}

	spin_lock_init(&cxsc->slock);

	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
			&snd_cx18_pcm_capture_ops);
	sp->info_flags = 0;
	sp->private_data = cxsc;
	strlcpy(sp->name, cx->card_name, sizeof(sp->name));

	return 0;

err_exit:
	return ret;
}
Commit	Line	Data
f9b071c7 AW	1	/*
	2	* ALSA PCM device for the
	3	* ALSA interface to cx18 PCM capture streams
	4	*
	5	* Copyright (C) 2009 Andy Walls <awalls@radix.net>
9972de90 DH	6	* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
	7	*
	8	* Portions of this work were sponsored by ONELAN Limited.
f9b071c7 AW	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.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	23	* 02111-1307 USA
	24	*/
	25
	26	#include <linux/init.h>
	27	#include <linux/kernel.h>
	28
	29	#include <media/v4l2-device.h>
	30
	31	#include <sound/core.h>
	32	#include <sound/pcm.h>
	33
	34	#include "cx18-driver.h"
9972de90 DH	35	#include "cx18-queue.h"
	36	#include "cx18-streams.h"
	37	#include "cx18-fileops.h"
f9b071c7 AW	38	#include "cx18-alsa.h"
f9b071c7 AW	39
71036ef2 DH	40	static unsigned int pcm_debug;
	41	module_param(pcm_debug, int, 0644);
	42	MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
9972de90 DH	43
9972de90 DH	44	#define dprintk(fmt, arg...) do { \
71036ef2 DH	45	if (pcm_debug) \
71036ef2 DH	46	printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \
9972de90 DH	47	__func__, ##arg); \
	48	} while (0)
	49
	50	/* Forward Declaration */
	51	void cx18_alsa_announce_pcm_data(struct snd_cx18_card cxsc, u8 pcm_data,
	52	size_t num_bytes);
	53
	54	static struct snd_pcm_hardware snd_cx18_hw_capture = {
	55	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	56	SNDRV_PCM_INFO_MMAP \|
	57	SNDRV_PCM_INFO_INTERLEAVED \|
	58	SNDRV_PCM_INFO_MMAP_VALID,
	59
	60	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	61
	62	.rates = SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_KNOT,
	63
	64	.rate_min = 48000,
	65	.rate_max = 48000,
	66	.channels_min = 2,
	67	.channels_max = 2,
	68	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	69	.period_bytes_min = 64, /* 12544/2, */
	70	.period_bytes_max = 12544,
	71	.periods_min = 2,
	72	.periods_max = 98, /* 12544, */
	73	};
	74
f9b071c7 AW	75	static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
	76	{
	77	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	78	struct snd_pcm_runtime *runtime = substream->runtime;
	79	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
f9b071c7	80	struct cx18 *cx = to_cx18(v4l2_dev);
9972de90 DH	81	struct cx18_stream *s;
	82	struct cx18_open_id *item;
	83	int ret;
	84
	85	/* Instruct the cx18 to start sending packets */
	86	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
	87
	88	/* Allocate memory */
	89	item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
780edb7a	90	if (NULL == item)
9972de90	91	return -ENOMEM;
780edb7a	92
9972de90 DH	93	item->cx = cx;
	94	item->type = s->type;
	95	item->open_id = cx->open_id++;
	96
	97	/* See if the stream is available */
	98	if (cx18_claim_stream(item, item->type)) {
	99	/* No, it's already in use */
1a8e0e33	100	kfree(item);
9972de90 DH	101	return -EBUSY;
	102	}
	103
	104	if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) \|\|
	105	test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
	106	/* We're already streaming. No additional action required */
	107	return 0;
	108	}
	109
	110
	111	runtime->hw = snd_cx18_hw_capture;
	112	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	113	cxsc->capture_pcm_substream = substream;
	114	runtime->private_data = cx;
	115
	116	cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;
	117
	118	/* Not currently streaming, so start it up */
	119	set_bit(CX18_F_S_STREAMING, &s->s_flags);
	120	ret = cx18_start_v4l2_encode_stream(s);
	121
f9b071c7 AW	122	return 0;
	123	}
	124
	125	static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
	126	{
9972de90 DH	127	unsigned long flags;
	128	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	129	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	130	struct cx18 *cx = to_cx18(v4l2_dev);
	131	struct cx18_stream *s;
	132	int ret;
	133
	134	/* Instruct the cx18 to stop sending packets */
	135	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
	136	ret = cx18_stop_v4l2_encode_stream(s, 0);
	137	clear_bit(CX18_F_S_STREAMING, &s->s_flags);
	138
	139	cx18_release_stream(s);
	140
	141	cx->pcm_announce_callback = NULL;
	142
	143	spin_lock_irqsave(&cxsc->slock, flags);
	144	if (substream->runtime->dma_area) {
	145	dprintk("freeing pcm capture region\n");
	146	vfree(substream->runtime->dma_area);
	147	substream->runtime->dma_area = NULL;
	148	}
	149	spin_unlock_irqrestore(&cxsc->slock, flags);
	150
f9b071c7 AW	151	return 0;
	152	}
	153
	154	static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream,
	155	unsigned int cmd, void *arg)
	156	{
	157	return snd_pcm_lib_ioctl(substream, cmd, arg);
	158	}
	159
9972de90 DH	160
	161	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	162	size_t size)
	163	{
	164	struct snd_pcm_runtime *runtime = subs->runtime;
	165
	166	dprintk("Allocating vbuffer\n");
	167	if (runtime->dma_area) {
	168	if (runtime->dma_bytes > size)
	169	return 0;
	170
	171	vfree(runtime->dma_area);
	172	}
	173	runtime->dma_area = vmalloc(size);
	174	if (!runtime->dma_area)
	175	return -ENOMEM;
	176
	177	runtime->dma_bytes = size;
	178
	179	return 0;
	180	}
	181
f9b071c7 AW	182	static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
	183	struct snd_pcm_hw_params *params)
	184	{
9972de90 DH	185	int ret;
	186
	187	dprintk("%s called\n", __func__);
	188
	189	ret = snd_pcm_alloc_vmalloc_buffer(substream,
	190	params_buffer_bytes(params));
f9b071c7 AW	191	return 0;
	192	}
	193
	194	static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream)
	195	{
	196	return 0;
	197	}
	198
	199	static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
	200	{
9972de90 DH	201	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	202
	203	cxsc->hwptr_done_capture = 0;
	204	cxsc->capture_transfer_done = 0;
	205
f9b071c7 AW	206	return 0;
	207	}
	208
	209	static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	210	{
	211	return 0;
	212	}
	213
	214	static
	215	snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
	216	{
9972de90 DH	217	unsigned long flags;
	218	snd_pcm_uframes_t hwptr_done;
	219	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	220
	221	spin_lock_irqsave(&cxsc->slock, flags);
	222	hwptr_done = cxsc->hwptr_done_capture;
	223	spin_unlock_irqrestore(&cxsc->slock, flags);
	224
	225	return hwptr_done;
	226	}
	227
9972de90 DH	228	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	229	unsigned long offset)
	230	{
	231	void *pageptr = subs->runtime->dma_area + offset;
	232
	233	return vmalloc_to_page(pageptr);
f9b071c7 AW	234	}
	235
	236	static struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
	237	.open = snd_cx18_pcm_capture_open,
	238	.close = snd_cx18_pcm_capture_close,
	239	.ioctl = snd_cx18_pcm_ioctl,
	240	.hw_params = snd_cx18_pcm_hw_params,
	241	.hw_free = snd_cx18_pcm_hw_free,
	242	.prepare = snd_cx18_pcm_prepare,
	243	.trigger = snd_cx18_pcm_trigger,
	244	.pointer = snd_cx18_pcm_pointer,
9972de90	245	.page = snd_pcm_get_vmalloc_page,
f9b071c7 AW	246	};
f9b071c7 AW	247
9972de90 DH	248	void cx18_alsa_announce_pcm_data(struct snd_cx18_card cxsc, u8 pcm_data,
	249	size_t num_bytes)
	250	{
	251	struct snd_pcm_substream *substream;
	252	struct snd_pcm_runtime *runtime;
	253	unsigned int oldptr;
	254	unsigned int stride;
	255	int period_elapsed = 0;
	256	int length;
	257
	258	dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc,
	259	pcm_data, num_bytes);
	260
	261	substream = cxsc->capture_pcm_substream;
	262	if (substream == NULL) {
	263	dprintk("substream was NULL\n");
	264	return;
	265	}
	266
	267	runtime = substream->runtime;
	268	if (runtime == NULL) {
	269	dprintk("runtime was NULL\n");
	270	return;
	271	}
	272
	273	stride = runtime->frame_bits >> 3;
	274	if (stride == 0) {
	275	dprintk("stride is zero\n");
	276	return;
	277	}
	278
	279	length = num_bytes / stride;
	280	if (length == 0) {
	281	dprintk("%s: length was zero\n", __func__);
	282	return;
	283	}
	284
	285	if (runtime->dma_area == NULL) {
	286	dprintk("dma area was NULL - ignoring\n");
	287	return;
	288	}
	289
	290	oldptr = cxsc->hwptr_done_capture;
	291	if (oldptr + length >= runtime->buffer_size) {
	292	unsigned int cnt =
	293	runtime->buffer_size - oldptr;
	294	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	295	cnt * stride);
	296	memcpy(runtime->dma_area, pcm_data + cnt * stride,
	297	length * stride - cnt * stride);
	298	} else {
	299	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	300	length * stride);
	301	}
	302	snd_pcm_stream_lock(substream);
	303
	304	cxsc->hwptr_done_capture += length;
	305	if (cxsc->hwptr_done_capture >=
	306	runtime->buffer_size)
	307	cxsc->hwptr_done_capture -=
	308	runtime->buffer_size;
	309
	310	cxsc->capture_transfer_done += length;
	311	if (cxsc->capture_transfer_done >=
312	runtime->period_size) {
313	cxsc->capture_transfer_done -=
314	runtime->period_size;
315	period_elapsed = 1;
316	}
317
318	snd_pcm_stream_unlock(substream);
319
320	if (period_elapsed)
321	snd_pcm_period_elapsed(substream);
322	}
323
324	int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
f9b071c7 AW	325	{
	326	struct snd_pcm *sp;
	327	struct snd_card *sc = cxsc->sc;
	328	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	329	struct cx18 *cx = to_cx18(v4l2_dev);
	330	int ret;
	331
	332	ret = snd_pcm_new(sc, "CX23418 PCM",
	333	0, /* PCM device 0, the only one for this card */
	334	0, /* 0 playback substreams */
	335	1, /* 1 capture substream */
	336	&sp);
	337	if (ret) {
	338	CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
	339	__func__, ret);
	340	goto err_exit;
	341	}
9972de90 DH	342
	343	spin_lock_init(&cxsc->slock);
	344
780edb7a DH	345	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
780edb7a DH	346	&snd_cx18_pcm_capture_ops);
9972de90 DH	347	sp->info_flags = 0;
9972de90 DH	348	sp->private_data = cxsc;
5eb9978f	349	strlcpy(sp->name, cx->card_name, sizeof(sp->name));
9972de90	350
f9b071c7 AW	351	return 0;
	352
	353	err_exit:
	354	return ret;
	355	}