[linux-2.6-block.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.
 *
 *  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"
#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=%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 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 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.
	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	39	#include "cx18-alsa.h"
5e6e81b2	40	#include "cx18-alsa-pcm.h"
f9b071c7	41
71036ef2 DH	42	static unsigned int pcm_debug;
	43	module_param(pcm_debug, int, 0644);
	44	MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
9972de90 DH	45
9972de90 DH	46	#define dprintk(fmt, arg...) do { \
71036ef2 DH	47	if (pcm_debug) \
71036ef2 DH	48	printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \
9972de90 DH	49	__func__, ##arg); \
	50	} while (0)
	51
9972de90 DH	52	static struct snd_pcm_hardware snd_cx18_hw_capture = {
	53	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	54	SNDRV_PCM_INFO_MMAP \|
	55	SNDRV_PCM_INFO_INTERLEAVED \|
	56	SNDRV_PCM_INFO_MMAP_VALID,
	57
	58	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	59
94b12d9e	60	.rates = SNDRV_PCM_RATE_48000,
9972de90 DH	61
	62	.rate_min = 48000,
	63	.rate_max = 48000,
	64	.channels_min = 2,
	65	.channels_max = 2,
	66	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	67	.period_bytes_min = 64, /* 12544/2, */
	68	.period_bytes_max = 12544,
	69	.periods_min = 2,
	70	.periods_max = 98, /* 12544, */
	71	};
	72
60433e2a DH	73	void cx18_alsa_announce_pcm_data(struct snd_cx18_card cxsc, u8 pcm_data,
	74	size_t num_bytes)
	75	{
	76	struct snd_pcm_substream *substream;
	77	struct snd_pcm_runtime *runtime;
	78	unsigned int oldptr;
	79	unsigned int stride;
	80	int period_elapsed = 0;
	81	int length;
	82
c2312f60	83	dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%zd\n", cxsc,
60433e2a DH	84	pcm_data, num_bytes);
	85
	86	substream = cxsc->capture_pcm_substream;
	87	if (substream == NULL) {
	88	dprintk("substream was NULL\n");
	89	return;
	90	}
	91
	92	runtime = substream->runtime;
	93	if (runtime == NULL) {
	94	dprintk("runtime was NULL\n");
	95	return;
	96	}
	97
	98	stride = runtime->frame_bits >> 3;
	99	if (stride == 0) {
	100	dprintk("stride is zero\n");
	101	return;
	102	}
	103
	104	length = num_bytes / stride;
	105	if (length == 0) {
	106	dprintk("%s: length was zero\n", __func__);
	107	return;
	108	}
	109
	110	if (runtime->dma_area == NULL) {
	111	dprintk("dma area was NULL - ignoring\n");
	112	return;
	113	}
	114
	115	oldptr = cxsc->hwptr_done_capture;
	116	if (oldptr + length >= runtime->buffer_size) {
	117	unsigned int cnt =
	118	runtime->buffer_size - oldptr;
	119	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	120	cnt * stride);
	121	memcpy(runtime->dma_area, pcm_data + cnt * stride,
	122	length * stride - cnt * stride);
	123	} else {
	124	memcpy(runtime->dma_area + oldptr * stride, pcm_data,
	125	length * stride);
	126	}
	127	snd_pcm_stream_lock(substream);
	128
	129	cxsc->hwptr_done_capture += length;
	130	if (cxsc->hwptr_done_capture >=
	131	runtime->buffer_size)
	132	cxsc->hwptr_done_capture -=
	133	runtime->buffer_size;
	134
	135	cxsc->capture_transfer_done += length;
	136	if (cxsc->capture_transfer_done >=
	137	runtime->period_size) {
	138	cxsc->capture_transfer_done -=
	139	runtime->period_size;
	140	period_elapsed = 1;
	141	}
	142
	143	snd_pcm_stream_unlock(substream);
	144
	145	if (period_elapsed)
	146	snd_pcm_period_elapsed(substream);
	147	}
148
f9b071c7 AW	149	static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
	150	{
	151	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	152	struct snd_pcm_runtime *runtime = substream->runtime;
	153	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
f9b071c7	154	struct cx18 *cx = to_cx18(v4l2_dev);
9972de90	155	struct cx18_stream *s;
831f476c	156	struct cx18_open_id item;
9972de90 DH	157	int ret;
	158
	159	/* Instruct the cx18 to start sending packets */
b4729dcb	160	snd_cx18_lock(cxsc);
9972de90 DH	161	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
9972de90 DH	162
831f476c AW	163	item.cx = cx;
	164	item.type = s->type;
	165	item.open_id = cx->open_id++;
9972de90 DH	166
9972de90 DH	167	/* See if the stream is available */
831f476c	168	if (cx18_claim_stream(&item, item.type)) {
9972de90	169	/* No, it's already in use */
b4729dcb	170	snd_cx18_unlock(cxsc);
9972de90 DH	171	return -EBUSY;
	172	}
	173
	174	if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) \|\|
	175	test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
	176	/* We're already streaming. No additional action required */
b4729dcb	177	snd_cx18_unlock(cxsc);
9972de90 DH	178	return 0;
	179	}
	180
	181
	182	runtime->hw = snd_cx18_hw_capture;
	183	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	184	cxsc->capture_pcm_substream = substream;
	185	runtime->private_data = cx;
	186
	187	cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;
	188
	189	/* Not currently streaming, so start it up */
	190	set_bit(CX18_F_S_STREAMING, &s->s_flags);
	191	ret = cx18_start_v4l2_encode_stream(s);
b4729dcb	192	snd_cx18_unlock(cxsc);
9972de90	193
932205a7	194	return ret;
f9b071c7 AW	195	}
	196
	197	static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
	198	{
9972de90 DH	199	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	200	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	201	struct cx18 *cx = to_cx18(v4l2_dev);
	202	struct cx18_stream *s;
9972de90 DH	203
9972de90 DH	204	/* Instruct the cx18 to stop sending packets */
b4729dcb	205	snd_cx18_lock(cxsc);
9972de90	206	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
932205a7	207	cx18_stop_v4l2_encode_stream(s, 0);
9972de90 DH	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	{
78b055be HV	221	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	222	int ret;
	223
	224	snd_cx18_lock(cxsc);
	225	ret = snd_pcm_lib_ioctl(substream, cmd, arg);
	226	snd_cx18_unlock(cxsc);
	227	return ret;
f9b071c7 AW	228	}
f9b071c7 AW	229
9972de90 DH	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
f9b071c7 AW	252	static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
	253	struct snd_pcm_hw_params *params)
	254	{
9972de90 DH	255	dprintk("%s called\n", __func__);
9972de90 DH	256
932205a7	257	return snd_pcm_alloc_vmalloc_buffer(substream,
9972de90	258	params_buffer_bytes(params));
f9b071c7 AW	259	}
	260
	261	static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream)
	262	{
94b12d9e DH	263	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	264	unsigned long flags;
	265
	266	spin_lock_irqsave(&cxsc->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(&cxsc->slock, flags);
	273
f9b071c7 AW	274	return 0;
	275	}
	276
	277	static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
	278	{
9972de90 DH	279	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	280
	281	cxsc->hwptr_done_capture = 0;
	282	cxsc->capture_transfer_done = 0;
	283
f9b071c7 AW	284	return 0;
	285	}
	286
	287	static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	288	{
	289	return 0;
	290	}
	291
	292	static
	293	snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
	294	{
9972de90 DH	295	unsigned long flags;
	296	snd_pcm_uframes_t hwptr_done;
	297	struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
	298
	299	spin_lock_irqsave(&cxsc->slock, flags);
	300	hwptr_done = cxsc->hwptr_done_capture;
	301	spin_unlock_irqrestore(&cxsc->slock, flags);
	302
	303	return hwptr_done;
	304	}
	305
9972de90 DH	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);
f9b071c7 AW	312	}
	313
	314	static struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
	315	.open = snd_cx18_pcm_capture_open,
	316	.close = snd_cx18_pcm_capture_close,
	317	.ioctl = snd_cx18_pcm_ioctl,
	318	.hw_params = snd_cx18_pcm_hw_params,
	319	.hw_free = snd_cx18_pcm_hw_free,
	320	.prepare = snd_cx18_pcm_prepare,
	321	.trigger = snd_cx18_pcm_trigger,
	322	.pointer = snd_cx18_pcm_pointer,
9972de90	323	.page = snd_pcm_get_vmalloc_page,
f9b071c7 AW	324	};
f9b071c7 AW	325
9972de90	326	int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
f9b071c7 AW	327	{
	328	struct snd_pcm *sp;
	329	struct snd_card *sc = cxsc->sc;
	330	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	331	struct cx18 *cx = to_cx18(v4l2_dev);
	332	int ret;
	333
	334	ret = snd_pcm_new(sc, "CX23418 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	CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
	341	__func__, ret);
	342	goto err_exit;
	343	}
9972de90 DH	344
	345	spin_lock_init(&cxsc->slock);
	346
780edb7a DH	347	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
780edb7a DH	348	&snd_cx18_pcm_capture_ops);
9972de90 DH	349	sp->info_flags = 0;
9972de90 DH	350	sp->private_data = cxsc;
5eb9978f	351	strlcpy(sp->name, cx->card_name, sizeof(sp->name));
9972de90	352
f9b071c7 AW	353	return 0;
	354
	355	err_exit:
	356	return ret;
	357	}