[mirror_ubuntu-artful-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)

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, */
};

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);
}

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,
};

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
9972de90 DH	50	static struct snd_pcm_hardware snd_cx18_hw_capture = {
	51	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	52	SNDRV_PCM_INFO_MMAP \|
	53	SNDRV_PCM_INFO_INTERLEAVED \|
	54	SNDRV_PCM_INFO_MMAP_VALID,
	55
	56	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	57
	58	.rates = SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_KNOT,
	59
	60	.rate_min = 48000,
	61	.rate_max = 48000,
	62	.channels_min = 2,
	63	.channels_max = 2,
	64	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	65	.period_bytes_min = 64, /* 12544/2, */
	66	.period_bytes_max = 12544,
	67	.periods_min = 2,
	68	.periods_max = 98, /* 12544, */
	69	};
	70
60433e2a DH	71	void cx18_alsa_announce_pcm_data(struct snd_cx18_card cxsc, u8 pcm_data,
	72	size_t num_bytes)
	73	{
	74	struct snd_pcm_substream *substream;
	75	struct snd_pcm_runtime *runtime;
	76	unsigned int oldptr;
	77	unsigned int stride;
	78	int period_elapsed = 0;
	79	int length;
	80
	81	dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc,
	82	pcm_data, num_bytes);
	83
	84	substream = cxsc->capture_pcm_substream;
	85	if (substream == NULL) {
	86	dprintk("substream was NULL\n");
	87	return;
	88	}
	89
	90	runtime = substream->runtime;
	91	if (runtime == NULL) {
	92	dprintk("runtime was NULL\n");
	93	return;
	94	}
	95
	96	stride = runtime->frame_bits >> 3;
	97	if (stride == 0) {
	98	dprintk("stride is zero\n");
	99	return;
	100	}
	101
	102	length = num_bytes / stride;
	103	if (length == 0) {
	104	dprintk("%s: length was zero\n", __func__);
	105	return;
	106	}
	107
	108	if (runtime->dma_area == NULL) {
	109	dprintk("dma area was NULL - ignoring\n");
	110	return;
	111	}
	112
	113	oldptr = cxsc->hwptr_done_capture;
	114	if (oldptr + length >= runtime->buffer_size) {
	115	unsigned int cnt =
	116	runtime->buffer_size - oldptr;
	117	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	118	cnt * stride);
	119	memcpy(runtime->dma_area, pcm_data + cnt * stride,
	120	length * stride - cnt * stride);
	121	} else {
	122	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	123	length * stride);
	124	}
	125	snd_pcm_stream_lock(substream);
	126
	127	cxsc->hwptr_done_capture += length;
	128	if (cxsc->hwptr_done_capture >=
	129	runtime->buffer_size)
	130	cxsc->hwptr_done_capture -=
	131	runtime->buffer_size;
	132
	133	cxsc->capture_transfer_done += length;
	134	if (cxsc->capture_transfer_done >=
135	runtime->period_size) {
136	cxsc->capture_transfer_done -=
137	runtime->period_size;
138	period_elapsed = 1;
139	}
140
141	snd_pcm_stream_unlock(substream);
142
143	if (period_elapsed)
144	snd_pcm_period_elapsed(substream);
145	}
146
f9b071c7 AW	147	static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
	148	{
	149	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	150	struct snd_pcm_runtime *runtime = substream->runtime;
	151	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
f9b071c7	152	struct cx18 *cx = to_cx18(v4l2_dev);
9972de90 DH	153	struct cx18_stream *s;
	154	struct cx18_open_id *item;
	155	int ret;
	156
	157	/* Instruct the cx18 to start sending packets */
	158	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
	159
	160	/* Allocate memory */
	161	item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
780edb7a	162	if (NULL == item)
9972de90	163	return -ENOMEM;
780edb7a	164
9972de90 DH	165	item->cx = cx;
	166	item->type = s->type;
	167	item->open_id = cx->open_id++;
	168
	169	/* See if the stream is available */
	170	if (cx18_claim_stream(item, item->type)) {
	171	/* No, it's already in use */
1a8e0e33	172	kfree(item);
9972de90 DH	173	return -EBUSY;
	174	}
	175
	176	if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) \|\|
	177	test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
	178	/* We're already streaming. No additional action required */
	179	return 0;
	180	}
	181
	182
	183	runtime->hw = snd_cx18_hw_capture;
	184	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	185	cxsc->capture_pcm_substream = substream;
	186	runtime->private_data = cx;
	187
	188	cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;
	189
	190	/* Not currently streaming, so start it up */
	191	set_bit(CX18_F_S_STREAMING, &s->s_flags);
	192	ret = cx18_start_v4l2_encode_stream(s);
	193
f9b071c7 AW	194	return 0;
	195	}
	196
	197	static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
	198	{
9972de90 DH	199	unsigned long flags;
	200	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	201	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	202	struct cx18 *cx = to_cx18(v4l2_dev);
	203	struct cx18_stream *s;
	204	int ret;
	205
	206	/* Instruct the cx18 to stop sending packets */
	207	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
	208	ret = cx18_stop_v4l2_encode_stream(s, 0);
	209	clear_bit(CX18_F_S_STREAMING, &s->s_flags);
	210
	211	cx18_release_stream(s);
	212
	213	cx->pcm_announce_callback = NULL;
	214
	215	spin_lock_irqsave(&cxsc->slock, flags);
	216	if (substream->runtime->dma_area) {
	217	dprintk("freeing pcm capture region\n");
	218	vfree(substream->runtime->dma_area);
	219	substream->runtime->dma_area = NULL;
	220	}
	221	spin_unlock_irqrestore(&cxsc->slock, flags);
	222
f9b071c7 AW	223	return 0;
	224	}
	225
	226	static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream,
	227	unsigned int cmd, void *arg)
	228	{
	229	return snd_pcm_lib_ioctl(substream, cmd, arg);
	230	}
	231
9972de90 DH	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
f9b071c7 AW	254	static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
	255	struct snd_pcm_hw_params *params)
	256	{
9972de90 DH	257	int ret;
	258
	259	dprintk("%s called\n", __func__);
	260
	261	ret = snd_pcm_alloc_vmalloc_buffer(substream,
	262	params_buffer_bytes(params));
f9b071c7 AW	263	return 0;
	264	}
	265
	266	static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream)
	267	{
	268	return 0;
	269	}
	270
	271	static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
	272	{
9972de90 DH	273	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	274
	275	cxsc->hwptr_done_capture = 0;
	276	cxsc->capture_transfer_done = 0;
	277
f9b071c7 AW	278	return 0;
	279	}
	280
	281	static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	282	{
	283	return 0;
	284	}
	285
	286	static
	287	snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
	288	{
9972de90 DH	289	unsigned long flags;
	290	snd_pcm_uframes_t hwptr_done;
	291	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	292
	293	spin_lock_irqsave(&cxsc->slock, flags);
	294	hwptr_done = cxsc->hwptr_done_capture;
	295	spin_unlock_irqrestore(&cxsc->slock, flags);
	296
	297	return hwptr_done;
	298	}
	299
9972de90 DH	300	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	301	unsigned long offset)
	302	{
	303	void *pageptr = subs->runtime->dma_area + offset;
	304
	305	return vmalloc_to_page(pageptr);
f9b071c7 AW	306	}
	307
	308	static struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
	309	.open = snd_cx18_pcm_capture_open,
	310	.close = snd_cx18_pcm_capture_close,
	311	.ioctl = snd_cx18_pcm_ioctl,
	312	.hw_params = snd_cx18_pcm_hw_params,
	313	.hw_free = snd_cx18_pcm_hw_free,
	314	.prepare = snd_cx18_pcm_prepare,
	315	.trigger = snd_cx18_pcm_trigger,
	316	.pointer = snd_cx18_pcm_pointer,
9972de90	317	.page = snd_pcm_get_vmalloc_page,
f9b071c7 AW	318	};
f9b071c7 AW	319
9972de90	320	int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
f9b071c7 AW	321	{
	322	struct snd_pcm *sp;
	323	struct snd_card *sc = cxsc->sc;
	324	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	325	struct cx18 *cx = to_cx18(v4l2_dev);
	326	int ret;
	327
	328	ret = snd_pcm_new(sc, "CX23418 PCM",
	329	0, /* PCM device 0, the only one for this card */
	330	0, /* 0 playback substreams */
	331	1, /* 1 capture substream */
	332	&sp);
	333	if (ret) {
	334	CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
	335	__func__, ret);
	336	goto err_exit;
	337	}
9972de90 DH	338
	339	spin_lock_init(&cxsc->slock);
	340
780edb7a DH	341	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
780edb7a DH	342	&snd_cx18_pcm_capture_ops);
9972de90 DH	343	sp->info_flags = 0;
9972de90 DH	344	sp->private_data = cxsc;
5eb9978f	345	strlcpy(sp->name, cx->card_name, sizeof(sp->name));
9972de90	346
f9b071c7 AW	347	return 0;
	348
	349	err_exit:
	350	return ret;
	351	}