[net-next-2.6.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 <linux/vmalloc.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_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, */
};

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=%zd\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 */
	snd_cx18_lock(cxsc);
	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];

	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 */
		snd_cx18_unlock(cxsc);
		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 */
		snd_cx18_unlock(cxsc);
		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);
	snd_cx18_unlock(cxsc);

	return 0;
}

static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
{
	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 */
	snd_cx18_lock(cxsc);
	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;
	snd_cx18_unlock(cxsc);

	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)
{
	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	unsigned long flags;

	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_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>
6aeb0905	28	#include <linux/vmalloc.h>
f9b071c7 AW	29
	30	#include <media/v4l2-device.h>
	31
	32	#include <sound/core.h>
	33	#include <sound/pcm.h>
	34
	35	#include "cx18-driver.h"
9972de90 DH	36	#include "cx18-queue.h"
	37	#include "cx18-streams.h"
	38	#include "cx18-fileops.h"
f9b071c7 AW	39	#include "cx18-alsa.h"
f9b071c7 AW	40
71036ef2 DH	41	static unsigned int pcm_debug;
	42	module_param(pcm_debug, int, 0644);
	43	MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
9972de90 DH	44
9972de90 DH	45	#define dprintk(fmt, arg...) do { \
71036ef2 DH	46	if (pcm_debug) \
71036ef2 DH	47	printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \
9972de90 DH	48	__func__, ##arg); \
	49	} while (0)
	50
9972de90 DH	51	static struct snd_pcm_hardware snd_cx18_hw_capture = {
	52	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	53	SNDRV_PCM_INFO_MMAP \|
	54	SNDRV_PCM_INFO_INTERLEAVED \|
	55	SNDRV_PCM_INFO_MMAP_VALID,
	56
	57	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	58
94b12d9e	59	.rates = SNDRV_PCM_RATE_48000,
9972de90 DH	60
	61	.rate_min = 48000,
	62	.rate_max = 48000,
	63	.channels_min = 2,
	64	.channels_max = 2,
	65	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	66	.period_bytes_min = 64, /* 12544/2, */
	67	.period_bytes_max = 12544,
	68	.periods_min = 2,
	69	.periods_max = 98, /* 12544, */
	70	};
	71
60433e2a DH	72	void cx18_alsa_announce_pcm_data(struct snd_cx18_card cxsc, u8 pcm_data,
	73	size_t num_bytes)
	74	{
	75	struct snd_pcm_substream *substream;
	76	struct snd_pcm_runtime *runtime;
	77	unsigned int oldptr;
	78	unsigned int stride;
	79	int period_elapsed = 0;
	80	int length;
	81
c2312f60	82	dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%zd\n", cxsc,
60433e2a DH	83	pcm_data, num_bytes);
	84
	85	substream = cxsc->capture_pcm_substream;
	86	if (substream == NULL) {
	87	dprintk("substream was NULL\n");
	88	return;
	89	}
	90
	91	runtime = substream->runtime;
	92	if (runtime == NULL) {
	93	dprintk("runtime was NULL\n");
	94	return;
	95	}
	96
	97	stride = runtime->frame_bits >> 3;
	98	if (stride == 0) {
	99	dprintk("stride is zero\n");
	100	return;
	101	}
	102
	103	length = num_bytes / stride;
	104	if (length == 0) {
	105	dprintk("%s: length was zero\n", __func__);
	106	return;
	107	}
	108
	109	if (runtime->dma_area == NULL) {
	110	dprintk("dma area was NULL - ignoring\n");
	111	return;
	112	}
	113
	114	oldptr = cxsc->hwptr_done_capture;
	115	if (oldptr + length >= runtime->buffer_size) {
	116	unsigned int cnt =
	117	runtime->buffer_size - oldptr;
	118	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	119	cnt * stride);
	120	memcpy(runtime->dma_area, pcm_data + cnt * stride,
	121	length * stride - cnt * stride);
	122	} else {
	123	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	124	length * stride);
	125	}
	126	snd_pcm_stream_lock(substream);
	127
	128	cxsc->hwptr_done_capture += length;
	129	if (cxsc->hwptr_done_capture >=
	130	runtime->buffer_size)
	131	cxsc->hwptr_done_capture -=
	132	runtime->buffer_size;
	133
	134	cxsc->capture_transfer_done += length;
	135	if (cxsc->capture_transfer_done >=
	136	runtime->period_size) {
	137	cxsc->capture_transfer_done -=
	138	runtime->period_size;
	139	period_elapsed = 1;
	140	}
	141
	142	snd_pcm_stream_unlock(substream);
	143
	144	if (period_elapsed)
	145	snd_pcm_period_elapsed(substream);
	146	}
147
f9b071c7 AW	148	static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
	149	{
	150	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	151	struct snd_pcm_runtime *runtime = substream->runtime;
	152	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
f9b071c7	153	struct cx18 *cx = to_cx18(v4l2_dev);
9972de90	154	struct cx18_stream *s;
831f476c	155	struct cx18_open_id item;
9972de90 DH	156	int ret;
	157
	158	/* Instruct the cx18 to start sending packets */
b4729dcb	159	snd_cx18_lock(cxsc);
9972de90 DH	160	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
9972de90 DH	161
831f476c AW	162	item.cx = cx;
	163	item.type = s->type;
	164	item.open_id = cx->open_id++;
9972de90 DH	165
9972de90 DH	166	/* See if the stream is available */
831f476c	167	if (cx18_claim_stream(&item, item.type)) {
9972de90	168	/* No, it's already in use */
b4729dcb	169	snd_cx18_unlock(cxsc);
9972de90 DH	170	return -EBUSY;
	171	}
	172
	173	if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) \|\|
	174	test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
	175	/* We're already streaming. No additional action required */
b4729dcb	176	snd_cx18_unlock(cxsc);
9972de90 DH	177	return 0;
	178	}
	179
	180
	181	runtime->hw = snd_cx18_hw_capture;
	182	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	183	cxsc->capture_pcm_substream = substream;
	184	runtime->private_data = cx;
	185
	186	cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;
	187
	188	/* Not currently streaming, so start it up */
	189	set_bit(CX18_F_S_STREAMING, &s->s_flags);
	190	ret = cx18_start_v4l2_encode_stream(s);
b4729dcb	191	snd_cx18_unlock(cxsc);
9972de90	192
f9b071c7 AW	193	return 0;
	194	}
	195
	196	static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
	197	{
9972de90 DH	198	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	199	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	200	struct cx18 *cx = to_cx18(v4l2_dev);
	201	struct cx18_stream *s;
	202	int ret;
	203
	204	/* Instruct the cx18 to stop sending packets */
b4729dcb	205	snd_cx18_lock(cxsc);
9972de90 DH	206	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
	207	ret = cx18_stop_v4l2_encode_stream(s, 0);
	208	clear_bit(CX18_F_S_STREAMING, &s->s_flags);
	209
	210	cx18_release_stream(s);
	211
	212	cx->pcm_announce_callback = NULL;
b4729dcb	213	snd_cx18_unlock(cxsc);
9972de90	214
f9b071c7 AW	215	return 0;
	216	}
	217
	218	static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream,
	219	unsigned int cmd, void *arg)
	220	{
	221	return snd_pcm_lib_ioctl(substream, cmd, arg);
	222	}
	223
9972de90 DH	224
	225	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	226	size_t size)
	227	{
	228	struct snd_pcm_runtime *runtime = subs->runtime;
	229
	230	dprintk("Allocating vbuffer\n");
	231	if (runtime->dma_area) {
	232	if (runtime->dma_bytes > size)
	233	return 0;
	234
	235	vfree(runtime->dma_area);
	236	}
	237	runtime->dma_area = vmalloc(size);
	238	if (!runtime->dma_area)
	239	return -ENOMEM;
	240
	241	runtime->dma_bytes = size;
	242
	243	return 0;
	244	}
	245
f9b071c7 AW	246	static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
	247	struct snd_pcm_hw_params *params)
	248	{
9972de90 DH	249	int ret;
	250
	251	dprintk("%s called\n", __func__);
	252
	253	ret = snd_pcm_alloc_vmalloc_buffer(substream,
	254	params_buffer_bytes(params));
f9b071c7 AW	255	return 0;
	256	}
	257
	258	static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream)
	259	{
94b12d9e DH	260	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	261	unsigned long flags;
	262
	263	spin_lock_irqsave(&cxsc->slock, flags);
	264	if (substream->runtime->dma_area) {
	265	dprintk("freeing pcm capture region\n");
	266	vfree(substream->runtime->dma_area);
	267	substream->runtime->dma_area = NULL;
	268	}
	269	spin_unlock_irqrestore(&cxsc->slock, flags);
	270
f9b071c7 AW	271	return 0;
	272	}
	273
	274	static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
	275	{
9972de90 DH	276	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	277
	278	cxsc->hwptr_done_capture = 0;
	279	cxsc->capture_transfer_done = 0;
	280
f9b071c7 AW	281	return 0;
	282	}
	283
	284	static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	285	{
	286	return 0;
	287	}
	288
	289	static
	290	snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
	291	{
9972de90 DH	292	unsigned long flags;
	293	snd_pcm_uframes_t hwptr_done;
	294	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	295
	296	spin_lock_irqsave(&cxsc->slock, flags);
	297	hwptr_done = cxsc->hwptr_done_capture;
	298	spin_unlock_irqrestore(&cxsc->slock, flags);
	299
	300	return hwptr_done;
	301	}
	302
9972de90 DH	303	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	304	unsigned long offset)
	305	{
	306	void *pageptr = subs->runtime->dma_area + offset;
	307
	308	return vmalloc_to_page(pageptr);
f9b071c7 AW	309	}
	310
	311	static struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
	312	.open = snd_cx18_pcm_capture_open,
	313	.close = snd_cx18_pcm_capture_close,
	314	.ioctl = snd_cx18_pcm_ioctl,
	315	.hw_params = snd_cx18_pcm_hw_params,
	316	.hw_free = snd_cx18_pcm_hw_free,
	317	.prepare = snd_cx18_pcm_prepare,
	318	.trigger = snd_cx18_pcm_trigger,
	319	.pointer = snd_cx18_pcm_pointer,
9972de90	320	.page = snd_pcm_get_vmalloc_page,
f9b071c7 AW	321	};
f9b071c7 AW	322
9972de90	323	int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
f9b071c7 AW	324	{
	325	struct snd_pcm *sp;
	326	struct snd_card *sc = cxsc->sc;
	327	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	328	struct cx18 *cx = to_cx18(v4l2_dev);
	329	int ret;
	330
	331	ret = snd_pcm_new(sc, "CX23418 PCM",
	332	0, /* PCM device 0, the only one for this card */
	333	0, /* 0 playback substreams */
	334	1, /* 1 capture substream */
	335	&sp);
	336	if (ret) {
	337	CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
	338	__func__, ret);
	339	goto err_exit;
	340	}
9972de90 DH	341
	342	spin_lock_init(&cxsc->slock);
	343
780edb7a DH	344	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
780edb7a DH	345	&snd_cx18_pcm_capture_ops);
9972de90 DH	346	sp->info_flags = 0;
9972de90 DH	347	sp->private_data = cxsc;
5eb9978f	348	strlcpy(sp->name, cx->card_name, sizeof(sp->name));
9972de90	349
f9b071c7 AW	350	return 0;
	351
	352	err_exit:
	353	return ret;
	354	}