[mirror_ubuntu-artful-kernel.git] / drivers / media / pci / cx18 / cx18-alsa-pcm.c

/*
 *  ALSA PCM device for the
 *  ALSA interface to cx18 PCM capture streams
 *
 *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.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.
 */

#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"
#include "cx18-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)						\
		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=%zu\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 ret;
}

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;

	/* Instruct the cx18 to stop sending packets */
	snd_cx18_lock(cxsc);
	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
	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)
{
	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	int ret;

	snd_cx18_lock(cxsc);
	ret = snd_pcm_lib_ioctl(substream, cmd, arg);
	snd_cx18_unlock(cxsc);
	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_cx18_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_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 const 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	*
6afdeaf8	5	* Copyright (C) 2009 Andy Walls <awalls@md.metrocast.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.
f9b071c7 AW	19	*/
	20
	21	#include <linux/init.h>
	22	#include <linux/kernel.h>
6aeb0905	23	#include <linux/vmalloc.h>
f9b071c7 AW	24
	25	#include <media/v4l2-device.h>
	26
	27	#include <sound/core.h>
	28	#include <sound/pcm.h>
	29
	30	#include "cx18-driver.h"
9972de90 DH	31	#include "cx18-queue.h"
	32	#include "cx18-streams.h"
	33	#include "cx18-fileops.h"
f9b071c7	34	#include "cx18-alsa.h"
5e6e81b2	35	#include "cx18-alsa-pcm.h"
f9b071c7	36
71036ef2 DH	37	static unsigned int pcm_debug;
	38	module_param(pcm_debug, int, 0644);
	39	MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
9972de90 DH	40
9972de90 DH	41	#define dprintk(fmt, arg...) do { \
71036ef2 DH	42	if (pcm_debug) \
71036ef2 DH	43	printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \
9972de90 DH	44	__func__, ##arg); \
	45	} while (0)
	46
9972de90 DH	47	static struct snd_pcm_hardware snd_cx18_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
94b12d9e	55	.rates = SNDRV_PCM_RATE_48000,
9972de90 DH	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
60433e2a DH	68	void cx18_alsa_announce_pcm_data(struct snd_cx18_card cxsc, u8 pcm_data,
	69	size_t num_bytes)
	70	{
	71	struct snd_pcm_substream *substream;
	72	struct snd_pcm_runtime *runtime;
	73	unsigned int oldptr;
	74	unsigned int stride;
	75	int period_elapsed = 0;
	76	int length;
	77
339f06c5	78	dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%zu\n", cxsc,
60433e2a DH	79	pcm_data, num_bytes);
	80
	81	substream = cxsc->capture_pcm_substream;
	82	if (substream == NULL) {
	83	dprintk("substream was NULL\n");
	84	return;
	85	}
	86
	87	runtime = substream->runtime;
	88	if (runtime == NULL) {
	89	dprintk("runtime was NULL\n");
	90	return;
	91	}
	92
	93	stride = runtime->frame_bits >> 3;
	94	if (stride == 0) {
	95	dprintk("stride is zero\n");
	96	return;
	97	}
	98
	99	length = num_bytes / stride;
	100	if (length == 0) {
	101	dprintk("%s: length was zero\n", __func__);
	102	return;
	103	}
	104
	105	if (runtime->dma_area == NULL) {
	106	dprintk("dma area was NULL - ignoring\n");
	107	return;
	108	}
	109
	110	oldptr = cxsc->hwptr_done_capture;
	111	if (oldptr + length >= runtime->buffer_size) {
	112	unsigned int cnt =
	113	runtime->buffer_size - oldptr;
	114	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	115	cnt * stride);
	116	memcpy(runtime->dma_area, pcm_data + cnt * stride,
	117	length * stride - cnt * stride);
	118	} else {
	119	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	120	length * stride);
	121	}
	122	snd_pcm_stream_lock(substream);
	123
	124	cxsc->hwptr_done_capture += length;
	125	if (cxsc->hwptr_done_capture >=
	126	runtime->buffer_size)
	127	cxsc->hwptr_done_capture -=
	128	runtime->buffer_size;
	129
	130	cxsc->capture_transfer_done += length;
	131	if (cxsc->capture_transfer_done >=
	132	runtime->period_size) {
	133	cxsc->capture_transfer_done -=
	134	runtime->period_size;
	135	period_elapsed = 1;
	136	}
	137
	138	snd_pcm_stream_unlock(substream);
	139
	140	if (period_elapsed)
	141	snd_pcm_period_elapsed(substream);
	142	}
143
f9b071c7 AW	144	static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
	145	{
	146	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	147	struct snd_pcm_runtime *runtime = substream->runtime;
	148	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
f9b071c7	149	struct cx18 *cx = to_cx18(v4l2_dev);
9972de90	150	struct cx18_stream *s;
831f476c	151	struct cx18_open_id item;
9972de90 DH	152	int ret;
	153
	154	/* Instruct the cx18 to start sending packets */
b4729dcb	155	snd_cx18_lock(cxsc);
9972de90 DH	156	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
9972de90 DH	157
831f476c AW	158	item.cx = cx;
	159	item.type = s->type;
	160	item.open_id = cx->open_id++;
9972de90 DH	161
9972de90 DH	162	/* See if the stream is available */
831f476c	163	if (cx18_claim_stream(&item, item.type)) {
9972de90	164	/* No, it's already in use */
b4729dcb	165	snd_cx18_unlock(cxsc);
9972de90 DH	166	return -EBUSY;
	167	}
	168
	169	if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) \|\|
	170	test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
	171	/* We're already streaming. No additional action required */
b4729dcb	172	snd_cx18_unlock(cxsc);
9972de90 DH	173	return 0;
	174	}
	175
	176
	177	runtime->hw = snd_cx18_hw_capture;
	178	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	179	cxsc->capture_pcm_substream = substream;
	180	runtime->private_data = cx;
	181
	182	cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;
	183
	184	/* Not currently streaming, so start it up */
	185	set_bit(CX18_F_S_STREAMING, &s->s_flags);
	186	ret = cx18_start_v4l2_encode_stream(s);
b4729dcb	187	snd_cx18_unlock(cxsc);
9972de90	188
932205a7	189	return ret;
f9b071c7 AW	190	}
	191
	192	static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
	193	{
9972de90 DH	194	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	195	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	196	struct cx18 *cx = to_cx18(v4l2_dev);
	197	struct cx18_stream *s;
9972de90 DH	198
9972de90 DH	199	/* Instruct the cx18 to stop sending packets */
b4729dcb	200	snd_cx18_lock(cxsc);
9972de90	201	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
932205a7	202	cx18_stop_v4l2_encode_stream(s, 0);
9972de90 DH	203	clear_bit(CX18_F_S_STREAMING, &s->s_flags);
	204
	205	cx18_release_stream(s);
	206
	207	cx->pcm_announce_callback = NULL;
b4729dcb	208	snd_cx18_unlock(cxsc);
9972de90	209
f9b071c7 AW	210	return 0;
	211	}
	212
	213	static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream,
	214	unsigned int cmd, void *arg)
	215	{
78b055be HV	216	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	217	int ret;
	218
	219	snd_cx18_lock(cxsc);
	220	ret = snd_pcm_lib_ioctl(substream, cmd, arg);
	221	snd_cx18_unlock(cxsc);
	222	return ret;
f9b071c7 AW	223	}
f9b071c7 AW	224
9972de90 DH	225
	226	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	227	size_t size)
	228	{
	229	struct snd_pcm_runtime *runtime = subs->runtime;
	230
	231	dprintk("Allocating vbuffer\n");
	232	if (runtime->dma_area) {
	233	if (runtime->dma_bytes > size)
	234	return 0;
	235
	236	vfree(runtime->dma_area);
	237	}
	238	runtime->dma_area = vmalloc(size);
	239	if (!runtime->dma_area)
	240	return -ENOMEM;
	241
	242	runtime->dma_bytes = size;
	243
	244	return 0;
	245	}
	246
f9b071c7 AW	247	static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
	248	struct snd_pcm_hw_params *params)
	249	{
9972de90 DH	250	dprintk("%s called\n", __func__);
9972de90 DH	251
932205a7	252	return snd_pcm_alloc_vmalloc_buffer(substream,
9972de90	253	params_buffer_bytes(params));
f9b071c7 AW	254	}
	255
	256	static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream)
	257	{
94b12d9e DH	258	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	259	unsigned long flags;
	260
	261	spin_lock_irqsave(&cxsc->slock, flags);
	262	if (substream->runtime->dma_area) {
	263	dprintk("freeing pcm capture region\n");
	264	vfree(substream->runtime->dma_area);
	265	substream->runtime->dma_area = NULL;
	266	}
	267	spin_unlock_irqrestore(&cxsc->slock, flags);
	268
f9b071c7 AW	269	return 0;
	270	}
	271
	272	static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
	273	{
9972de90 DH	274	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	275
	276	cxsc->hwptr_done_capture = 0;
	277	cxsc->capture_transfer_done = 0;
	278
f9b071c7 AW	279	return 0;
	280	}
	281
	282	static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	283	{
	284	return 0;
	285	}
	286
	287	static
	288	snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
	289	{
9972de90 DH	290	unsigned long flags;
	291	snd_pcm_uframes_t hwptr_done;
	292	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	293
	294	spin_lock_irqsave(&cxsc->slock, flags);
	295	hwptr_done = cxsc->hwptr_done_capture;
	296	spin_unlock_irqrestore(&cxsc->slock, flags);
	297
	298	return hwptr_done;
	299	}
	300
9972de90 DH	301	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	302	unsigned long offset)
	303	{
	304	void *pageptr = subs->runtime->dma_area + offset;
	305
	306	return vmalloc_to_page(pageptr);
f9b071c7 AW	307	}
f9b071c7 AW	308
5c8d8c01	309	static const struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
f9b071c7 AW	310	.open = snd_cx18_pcm_capture_open,
	311	.close = snd_cx18_pcm_capture_close,
	312	.ioctl = snd_cx18_pcm_ioctl,
	313	.hw_params = snd_cx18_pcm_hw_params,
	314	.hw_free = snd_cx18_pcm_hw_free,
	315	.prepare = snd_cx18_pcm_prepare,
	316	.trigger = snd_cx18_pcm_trigger,
	317	.pointer = snd_cx18_pcm_pointer,
9972de90	318	.page = snd_pcm_get_vmalloc_page,
f9b071c7 AW	319	};
f9b071c7 AW	320
9972de90	321	int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
f9b071c7 AW	322	{
	323	struct snd_pcm *sp;
	324	struct snd_card *sc = cxsc->sc;
	325	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	326	struct cx18 *cx = to_cx18(v4l2_dev);
	327	int ret;
	328
	329	ret = snd_pcm_new(sc, "CX23418 PCM",
	330	0, /* PCM device 0, the only one for this card */
	331	0, /* 0 playback substreams */
	332	1, /* 1 capture substream */
	333	&sp);
	334	if (ret) {
	335	CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
	336	__func__, ret);
	337	goto err_exit;
	338	}
9972de90 DH	339
	340	spin_lock_init(&cxsc->slock);
	341
780edb7a DH	342	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
780edb7a DH	343	&snd_cx18_pcm_capture_ops);
9972de90 DH	344	sp->info_flags = 0;
9972de90 DH	345	sp->private_data = cxsc;
5eb9978f	346	strlcpy(sp->name, cx->card_name, sizeof(sp->name));
9972de90	347
f9b071c7 AW	348	return 0;
	349
	350	err_exit:
	351	return ret;
	352	}