drivers/media/pci/cx25821/cx25821-video.c

/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
 *  Based on Steven Toth <stoth@linuxtv.org> cx23885 driver
 *  Parts adapted/taken from Eduardo Moscoso Rubino
 *  Copyright (C) 2009 Eduardo Moscoso Rubino <moscoso@TopoLogica.com>
 *
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "cx25821-video.h"

MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
MODULE_LICENSE("GPL");

static unsigned int video_nr[] = {[0 ... (CX25821_MAXBOARDS - 1)] = UNSET };

module_param_array(video_nr, int, NULL, 0444);

MODULE_PARM_DESC(video_nr, "video device numbers");

static unsigned int video_debug = VIDEO_DEBUG;
module_param(video_debug, int, 0644);
MODULE_PARM_DESC(video_debug, "enable debug messages [video]");

static unsigned int irq_debug;
module_param(irq_debug, int, 0644);
MODULE_PARM_DESC(irq_debug, "enable debug messages [IRQ handler]");

static unsigned int vid_limit = 16;
module_param(vid_limit, int, 0644);
MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");

#define FORMAT_FLAGS_PACKED       0x01

static const struct cx25821_fmt formats[] = {
	{
		.name = "8 bpp, gray",
		.fourcc = V4L2_PIX_FMT_GREY,
		.depth = 8,
		.flags = FORMAT_FLAGS_PACKED,
	 }, {
		.name = "4:1:1, packed, Y41P",
		.fourcc = V4L2_PIX_FMT_Y41P,
		.depth = 12,
		.flags = FORMAT_FLAGS_PACKED,
	}, {
		.name = "4:2:2, packed, YUYV",
		.fourcc = V4L2_PIX_FMT_YUYV,
		.depth = 16,
		.flags = FORMAT_FLAGS_PACKED,
	}, {
		.name = "4:2:2, packed, UYVY",
		.fourcc = V4L2_PIX_FMT_UYVY,
		.depth = 16,
		.flags = FORMAT_FLAGS_PACKED,
	}, {
		.name = "4:2:0, YUV",
		.fourcc = V4L2_PIX_FMT_YUV420,
		.depth = 12,
		.flags = FORMAT_FLAGS_PACKED,
	},
};

static const struct cx25821_fmt *cx25821_format_by_fourcc(unsigned int fourcc)
{
	unsigned int i;

	if (fourcc == V4L2_PIX_FMT_Y41P || fourcc == V4L2_PIX_FMT_YUV411P)
		return formats + 1;

	for (i = 0; i < ARRAY_SIZE(formats); i++)
		if (formats[i].fourcc == fourcc)
			return formats + i;

	pr_err("%s(0x%08x) NOT FOUND\n", __func__, fourcc);
	return NULL;
}

void cx25821_video_wakeup(struct cx25821_dev *dev, struct cx25821_dmaqueue *q,
			  u32 count)
{
	struct cx25821_buffer *buf;
	int bc;

	for (bc = 0;; bc++) {
		if (list_empty(&q->active)) {
			dprintk(1, "bc=%d (=0: active empty)\n", bc);
			break;
		}

		buf = list_entry(q->active.next, struct cx25821_buffer,
				vb.queue);

		/* count comes from the hw and it is 16bit wide --
		 * this trick handles wrap-arounds correctly for
		 * up to 32767 buffers in flight... */
		if ((s16) (count - buf->count) < 0)
			break;

		v4l2_get_timestamp(&buf->vb.ts);
		buf->vb.state = VIDEOBUF_DONE;
		list_del(&buf->vb.queue);
		wake_up(&buf->vb.done);
	}

	if (list_empty(&q->active))
		del_timer(&q->timeout);
	else
		mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
	if (bc != 1)
		pr_err("%s: %d buffers handled (should be 1)\n", __func__, bc);
}

static int cx25821_set_tvnorm(struct cx25821_dev *dev, v4l2_std_id norm)
{
	dprintk(1, "%s(norm = 0x%08x) name: [%s]\n",
		__func__, (unsigned int)norm, v4l2_norm_to_name(norm));

	dev->tvnorm = norm;

	/* Tell the internal A/V decoder */
	cx25821_call_all(dev, core, s_std, norm);

	return 0;
}

/* resource management */
static int cx25821_res_get(struct cx25821_dev *dev, struct cx25821_fh *fh,
		    unsigned int bit)
{
	dprintk(1, "%s()\n", __func__);
	if (fh->resources & bit)
		/* have it already allocated */
		return 1;

	/* is it free? */
	if (dev->channels[fh->channel_id].resources & bit) {
		/* no, someone else uses it */
		return 0;
	}
	/* it's free, grab it */
	fh->resources |= bit;
	dev->channels[fh->channel_id].resources |= bit;
	dprintk(1, "res: get %d\n", bit);
	return 1;
}

static int cx25821_res_check(struct cx25821_fh *fh, unsigned int bit)
{
	return fh->resources & bit;
}

static int cx25821_res_locked(struct cx25821_fh *fh, unsigned int bit)
{
	return fh->dev->channels[fh->channel_id].resources & bit;
}

static void cx25821_res_free(struct cx25821_dev *dev, struct cx25821_fh *fh,
		      unsigned int bits)
{
	BUG_ON((fh->resources & bits) != bits);
	dprintk(1, "%s()\n", __func__);

	fh->resources &= ~bits;
	dev->channels[fh->channel_id].resources &= ~bits;
	dprintk(1, "res: put %d\n", bits);
}

static int cx25821_video_mux(struct cx25821_dev *dev, unsigned int input)
{
	struct v4l2_routing route;
	memset(&route, 0, sizeof(route));

	dprintk(1, "%s(): video_mux: %d [vmux=%d, gpio=0x%x,0x%x,0x%x,0x%x]\n",
		__func__, input, INPUT(input)->vmux, INPUT(input)->gpio0,
		INPUT(input)->gpio1, INPUT(input)->gpio2, INPUT(input)->gpio3);
	dev->input = input;

	route.input = INPUT(input)->vmux;

	/* Tell the internal A/V decoder */
	cx25821_call_all(dev, video, s_routing, INPUT(input)->vmux, 0, 0);

	return 0;
}

int cx25821_start_video_dma(struct cx25821_dev *dev,
			    struct cx25821_dmaqueue *q,
			    struct cx25821_buffer *buf,
			    const struct sram_channel *channel)
{
	int tmp = 0;

	/* setup fifo + format */
	cx25821_sram_channel_setup(dev, channel, buf->bpl, buf->risc.dma);

	/* reset counter */
	cx_write(channel->gpcnt_ctl, 3);
	q->count = 1;

	/* enable irq */
	cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << channel->i));
	cx_set(channel->int_msk, 0x11);

	/* start dma */
	cx_write(channel->dma_ctl, 0x11);	/* FIFO and RISC enable */

	/* make sure upstream setting if any is reversed */
	tmp = cx_read(VID_CH_MODE_SEL);
	cx_write(VID_CH_MODE_SEL, tmp & 0xFFFFFE00);

	return 0;
}

static int cx25821_restart_video_queue(struct cx25821_dev *dev,
				       struct cx25821_dmaqueue *q,
				       const struct sram_channel *channel)
{
	struct cx25821_buffer *buf, *prev;
	struct list_head *item;

	if (!list_empty(&q->active)) {
		buf = list_entry(q->active.next, struct cx25821_buffer,
				vb.queue);

		cx25821_start_video_dma(dev, q, buf, channel);

		list_for_each(item, &q->active) {
			buf = list_entry(item, struct cx25821_buffer, vb.queue);
			buf->count = q->count++;
		}

		mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
		return 0;
	}

	prev = NULL;
	for (;;) {
		if (list_empty(&q->queued))
			return 0;

		buf = list_entry(q->queued.next, struct cx25821_buffer,
				vb.queue);

		if (NULL == prev) {
			list_move_tail(&buf->vb.queue, &q->active);
			cx25821_start_video_dma(dev, q, buf, channel);
			buf->vb.state = VIDEOBUF_ACTIVE;
			buf->count = q->count++;
			mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
		} else if (prev->vb.width == buf->vb.width &&
			   prev->vb.height == buf->vb.height &&
			   prev->fmt == buf->fmt) {
			list_move_tail(&buf->vb.queue, &q->active);
			buf->vb.state = VIDEOBUF_ACTIVE;
			buf->count = q->count++;
			prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
			prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63 - 32 */
		} else {
			return 0;
		}
		prev = buf;
	}
}

static void cx25821_vid_timeout(unsigned long data)
{
	struct cx25821_data *timeout_data = (struct cx25821_data *)data;
	struct cx25821_dev *dev = timeout_data->dev;
	const struct sram_channel *channel = timeout_data->channel;
	struct cx25821_dmaqueue *q = &dev->channels[channel->i].vidq;
	struct cx25821_buffer *buf;
	unsigned long flags;

	/* cx25821_sram_channel_dump(dev, channel); */
	cx_clear(channel->dma_ctl, 0x11);

	spin_lock_irqsave(&dev->slock, flags);
	while (!list_empty(&q->active)) {
		buf = list_entry(q->active.next, struct cx25821_buffer,
				vb.queue);
		list_del(&buf->vb.queue);

		buf->vb.state = VIDEOBUF_ERROR;
		wake_up(&buf->vb.done);
	}

	cx25821_restart_video_queue(dev, q, channel);
	spin_unlock_irqrestore(&dev->slock, flags);
}

int cx25821_video_irq(struct cx25821_dev *dev, int chan_num, u32 status)
{
	u32 count = 0;
	int handled = 0;
	u32 mask;
	const struct sram_channel *channel = dev->channels[chan_num].sram_channels;

	mask = cx_read(channel->int_msk);
	if (0 == (status & mask))
		return handled;

	cx_write(channel->int_stat, status);

	/* risc op code error */
	if (status & (1 << 16)) {
		pr_warn("%s, %s: video risc op code error\n",
			dev->name, channel->name);
		cx_clear(channel->dma_ctl, 0x11);
		cx25821_sram_channel_dump(dev, channel);
	}

	/* risc1 y */
	if (status & FLD_VID_DST_RISC1) {
		spin_lock(&dev->slock);
		count = cx_read(channel->gpcnt);
		cx25821_video_wakeup(dev, &dev->channels[channel->i].vidq,
				count);
		spin_unlock(&dev->slock);
		handled++;
	}

	/* risc2 y */
	if (status & 0x10) {
		dprintk(2, "stopper video\n");
		spin_lock(&dev->slock);
		cx25821_restart_video_queue(dev,
				&dev->channels[channel->i].vidq, channel);
		spin_unlock(&dev->slock);
		handled++;
	}
	return handled;
}

static int cx25821_buffer_setup(struct videobuf_queue *q, unsigned int *count,
		 unsigned int *size)
{
	struct cx25821_fh *fh = q->priv_data;

	*size = fh->fmt->depth * fh->width * fh->height >> 3;

	if (0 == *count)
		*count = 32;

	if (*size * *count > vid_limit * 1024 * 1024)
		*count = (vid_limit * 1024 * 1024) / *size;

	return 0;
}

static int cx25821_buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
		   enum v4l2_field field)
{
	struct cx25821_fh *fh = q->priv_data;
	struct cx25821_dev *dev = fh->dev;
	struct cx25821_buffer *buf =
		container_of(vb, struct cx25821_buffer, vb);
	int rc, init_buffer = 0;
	u32 line0_offset;
	struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
	int bpl_local = LINE_SIZE_D1;
	int channel_opened = fh->channel_id;

	BUG_ON(NULL == fh->fmt);
	if (fh->width < 48 || fh->width > 720 ||
	    fh->height < 32 || fh->height > 576)
		return -EINVAL;

	buf->vb.size = (fh->width * fh->height * fh->fmt->depth) >> 3;

	if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
		return -EINVAL;

	if (buf->fmt != fh->fmt ||
	    buf->vb.width != fh->width ||
	    buf->vb.height != fh->height || buf->vb.field != field) {
		buf->fmt = fh->fmt;
		buf->vb.width = fh->width;
		buf->vb.height = fh->height;
		buf->vb.field = field;
		init_buffer = 1;
	}

	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
		init_buffer = 1;
		rc = videobuf_iolock(q, &buf->vb, NULL);
		if (0 != rc) {
			printk(KERN_DEBUG pr_fmt("videobuf_iolock failed!\n"));
			goto fail;
		}
	}

	dprintk(1, "init_buffer=%d\n", init_buffer);

	if (init_buffer) {

		channel_opened = dev->channel_opened;
		if (channel_opened < 0 || channel_opened > 7)
			channel_opened = 7;

		if (dev->channels[channel_opened].pixel_formats ==
				PIXEL_FRMT_411)
			buf->bpl = (buf->fmt->depth * buf->vb.width) >> 3;
		else
			buf->bpl = (buf->fmt->depth >> 3) * (buf->vb.width);

		if (dev->channels[channel_opened].pixel_formats ==
				PIXEL_FRMT_411) {
			bpl_local = buf->bpl;
		} else {
			bpl_local = buf->bpl;   /* Default */

			if (channel_opened >= 0 && channel_opened <= 7) {
				if (dev->channels[channel_opened]
						.use_cif_resolution) {
					if (dev->tvnorm & V4L2_STD_PAL_BG ||
					    dev->tvnorm & V4L2_STD_PAL_DK)
						bpl_local = 352 << 1;
					else
						bpl_local = dev->channels[
							channel_opened].
							cif_width << 1;
				}
			}
		}

		switch (buf->vb.field) {
		case V4L2_FIELD_TOP:
			cx25821_risc_buffer(dev->pci, &buf->risc,
					    dma->sglist, 0, UNSET,
					    buf->bpl, 0, buf->vb.height);
			break;
		case V4L2_FIELD_BOTTOM:
			cx25821_risc_buffer(dev->pci, &buf->risc,
					    dma->sglist, UNSET, 0,
					    buf->bpl, 0, buf->vb.height);
			break;
		case V4L2_FIELD_INTERLACED:
			/* All other formats are top field first */
			line0_offset = 0;
			dprintk(1, "top field first\n");

			cx25821_risc_buffer(dev->pci, &buf->risc,
					    dma->sglist, line0_offset,
					    bpl_local, bpl_local, bpl_local,
					    buf->vb.height >> 1);
			break;
		case V4L2_FIELD_SEQ_TB:
			cx25821_risc_buffer(dev->pci, &buf->risc,
					    dma->sglist,
					    0, buf->bpl * (buf->vb.height >> 1),
					    buf->bpl, 0, buf->vb.height >> 1);
			break;
		case V4L2_FIELD_SEQ_BT:
			cx25821_risc_buffer(dev->pci, &buf->risc,
					    dma->sglist,
					    buf->bpl * (buf->vb.height >> 1), 0,
					    buf->bpl, 0, buf->vb.height >> 1);
			break;
		default:
			BUG();
		}
	}

	dprintk(2, "[%p/%d] buffer_prep - %dx%d %dbpp \"%s\" - dma=0x%08lx\n",
		buf, buf->vb.i, fh->width, fh->height, fh->fmt->depth,
		fh->fmt->name, (unsigned long)buf->risc.dma);

	buf->vb.state = VIDEOBUF_PREPARED;

	return 0;

fail:
	cx25821_free_buffer(q, buf);
	return rc;
}

static void cx25821_buffer_release(struct videobuf_queue *q,
			    struct videobuf_buffer *vb)
{
	struct cx25821_buffer *buf =
		container_of(vb, struct cx25821_buffer, vb);

	cx25821_free_buffer(q, buf);
}

static struct videobuf_queue *get_queue(struct cx25821_fh *fh)
{
	switch (fh->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		return &fh->vidq;
	default:
		BUG();
		return NULL;
	}
}

static int cx25821_get_resource(struct cx25821_fh *fh, int resource)
{
	switch (fh->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		return resource;
	default:
		BUG();
		return 0;
	}
}

static int cx25821_video_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct cx25821_fh *fh = file->private_data;

	return videobuf_mmap_mapper(get_queue(fh), vma);
}


static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
	struct cx25821_buffer *buf =
		container_of(vb, struct cx25821_buffer, vb);
	struct cx25821_buffer *prev;
	struct cx25821_fh *fh = vq->priv_data;
	struct cx25821_dev *dev = fh->dev;
	struct cx25821_dmaqueue *q = &dev->channels[fh->channel_id].vidq;

	/* add jump to stopper */
	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
	buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
	buf->risc.jmp[2] = cpu_to_le32(0);      /* bits 63-32 */

	dprintk(2, "jmp to stopper (0x%x)\n", buf->risc.jmp[1]);

	if (!list_empty(&q->queued)) {
		list_add_tail(&buf->vb.queue, &q->queued);
		buf->vb.state = VIDEOBUF_QUEUED;
		dprintk(2, "[%p/%d] buffer_queue - append to queued\n", buf,
				buf->vb.i);

	} else if (list_empty(&q->active)) {
		list_add_tail(&buf->vb.queue, &q->active);
		cx25821_start_video_dma(dev, q, buf,
				dev->channels[fh->channel_id].sram_channels);
		buf->vb.state = VIDEOBUF_ACTIVE;
		buf->count = q->count++;
		mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
		dprintk(2, "[%p/%d] buffer_queue - first active, buf cnt = %d, q->count = %d\n",
				buf, buf->vb.i, buf->count, q->count);
	} else {
		prev = list_entry(q->active.prev, struct cx25821_buffer,
				vb.queue);
		if (prev->vb.width == buf->vb.width
		   && prev->vb.height == buf->vb.height
		   && prev->fmt == buf->fmt) {
			list_add_tail(&buf->vb.queue, &q->active);
			buf->vb.state = VIDEOBUF_ACTIVE;
			buf->count = q->count++;
			prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);

			/* 64 bit bits 63-32 */
			prev->risc.jmp[2] = cpu_to_le32(0);
			dprintk(2, "[%p/%d] buffer_queue - append to active, buf->count=%d\n",
					buf, buf->vb.i, buf->count);

		} else {
			list_add_tail(&buf->vb.queue, &q->queued);
			buf->vb.state = VIDEOBUF_QUEUED;
			dprintk(2, "[%p/%d] buffer_queue - first queued\n", buf,
					buf->vb.i);
		}
	}

	if (list_empty(&q->active))
		dprintk(2, "active queue empty!\n");
}

static struct videobuf_queue_ops cx25821_video_qops = {
	.buf_setup = cx25821_buffer_setup,
	.buf_prepare = cx25821_buffer_prepare,
	.buf_queue = buffer_queue,
	.buf_release = cx25821_buffer_release,
};

static int video_open(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct cx25821_dev *dev = video_drvdata(file);
	struct cx25821_fh *fh;
	enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	u32 pix_format;
	int ch_id;

	for (ch_id = 0; ch_id < MAX_VID_CHANNEL_NUM - 1; ch_id++)
		if (&dev->channels[ch_id].vdev == vdev)
			break;

	/* Can't happen */
	if (ch_id >= MAX_VID_CHANNEL_NUM - 1)
		return -ENODEV;

	/* allocate + initialize per filehandle data */
	fh = kzalloc(sizeof(*fh), GFP_KERNEL);
	if (NULL == fh)
		return -ENOMEM;

	file->private_data = fh;
	fh->dev = dev;
	fh->type = type;
	fh->width = 720;
	fh->channel_id = ch_id;

	if (dev->tvnorm & V4L2_STD_PAL_BG || dev->tvnorm & V4L2_STD_PAL_DK)
		fh->height = 576;
	else
		fh->height = 480;

	dev->channel_opened = fh->channel_id;
	if (dev->channels[ch_id].pixel_formats == PIXEL_FRMT_411)
		pix_format = V4L2_PIX_FMT_Y41P;
	else
		pix_format = V4L2_PIX_FMT_YUYV;
	fh->fmt = cx25821_format_by_fourcc(pix_format);

	v4l2_prio_open(&dev->channels[ch_id].prio, &fh->prio);

	videobuf_queue_sg_init(&fh->vidq, &cx25821_video_qops, &dev->pci->dev,
			&dev->slock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
			V4L2_FIELD_INTERLACED, sizeof(struct cx25821_buffer),
			fh, &dev->lock);

	dprintk(1, "post videobuf_queue_init()\n");

	return 0;
}

static ssize_t video_read(struct file *file, char __user * data, size_t count,
			 loff_t *ppos)
{
	struct cx25821_fh *fh = file->private_data;
	struct cx25821_dev *dev = fh->dev;
	int err;

	switch (fh->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		if (mutex_lock_interruptible(&dev->lock))
			return -ERESTARTSYS;
		if (cx25821_res_locked(fh, RESOURCE_VIDEO0))
			err = -EBUSY;
		else
			err = videobuf_read_one(&fh->vidq, data, count, ppos,
					file->f_flags & O_NONBLOCK);
		mutex_unlock(&dev->lock);
		return err;

	default:
		return -ENODEV;
	}

}

static unsigned int video_poll(struct file *file,
			      struct poll_table_struct *wait)
{
	struct cx25821_fh *fh = file->private_data;
	struct cx25821_buffer *buf;

	if (cx25821_res_check(fh, RESOURCE_VIDEO0)) {
		/* streaming capture */
		if (list_empty(&fh->vidq.stream))
			return POLLERR;
		buf = list_entry(fh->vidq.stream.next,
				struct cx25821_buffer, vb.stream);
	} else {
		/* read() capture */
		buf = (struct cx25821_buffer *)fh->vidq.read_buf;
		if (NULL == buf)
			return POLLERR;
	}

	poll_wait(file, &buf->vb.done, wait);
	if (buf->vb.state == VIDEOBUF_DONE || buf->vb.state == VIDEOBUF_ERROR) {
		if (buf->vb.state == VIDEOBUF_DONE) {
			struct cx25821_dev *dev = fh->dev;

			if (dev && dev->channels[fh->channel_id]
					.use_cif_resolution) {
				u8 cam_id = *((char *)buf->vb.baddr + 3);
				memcpy((char *)buf->vb.baddr,
				      (char *)buf->vb.baddr + (fh->width * 2),
				      (fh->width * 2));
				*((char *)buf->vb.baddr + 3) = cam_id;
			}
		}

		return POLLIN | POLLRDNORM;
	}

	return 0;
}

static int video_release(struct file *file)
{
	struct cx25821_fh *fh = file->private_data;
	struct cx25821_dev *dev = fh->dev;
	const struct sram_channel *sram_ch =
		dev->channels[0].sram_channels;

	mutex_lock(&dev->lock);
	/* stop the risc engine and fifo */
	cx_write(sram_ch->dma_ctl, 0); /* FIFO and RISC disable */

	/* stop video capture */
	if (cx25821_res_check(fh, RESOURCE_VIDEO0)) {
		videobuf_queue_cancel(&fh->vidq);
		cx25821_res_free(dev, fh, RESOURCE_VIDEO0);
	}
	mutex_unlock(&dev->lock);

	if (fh->vidq.read_buf) {
		cx25821_buffer_release(&fh->vidq, fh->vidq.read_buf);
		kfree(fh->vidq.read_buf);
	}

	videobuf_mmap_free(&fh->vidq);

	v4l2_prio_close(&dev->channels[fh->channel_id].prio, fh->prio);
	file->private_data = NULL;
	kfree(fh);

	return 0;
}

/* VIDEO IOCTLS */
static int cx25821_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
				 struct v4l2_format *f)
{
	struct cx25821_fh *fh = priv;

	f->fmt.pix.width = fh->width;
	f->fmt.pix.height = fh->height;
	f->fmt.pix.field = fh->vidq.field;
	f->fmt.pix.pixelformat = fh->fmt->fourcc;
	f->fmt.pix.bytesperline = (f->fmt.pix.width * fh->fmt->depth) >> 3;
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;

	return 0;
}

static int cx25821_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
				   struct v4l2_format *f)
{
	const struct cx25821_fmt *fmt;
	enum v4l2_field field;
	unsigned int maxw, maxh;

	fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
	if (NULL == fmt)
		return -EINVAL;

	field = f->fmt.pix.field;
	maxw = 720;
	maxh = 576;

	if (V4L2_FIELD_ANY == field) {
		if (f->fmt.pix.height > maxh / 2)
			field = V4L2_FIELD_INTERLACED;
		else
			field = V4L2_FIELD_TOP;
	}

	switch (field) {
	case V4L2_FIELD_TOP:
	case V4L2_FIELD_BOTTOM:
		maxh = maxh / 2;
		break;
	case V4L2_FIELD_INTERLACED:
		break;
	default:
		return -EINVAL;
	}

	f->fmt.pix.field = field;
	if (f->fmt.pix.height < 32)
		f->fmt.pix.height = 32;
	if (f->fmt.pix.height > maxh)
		f->fmt.pix.height = maxh;
	if (f->fmt.pix.width < 48)
		f->fmt.pix.width = 48;
	if (f->fmt.pix.width > maxw)
		f->fmt.pix.width = maxw;
	f->fmt.pix.width &= ~0x03;
	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;

	return 0;
}
static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
{
	struct cx25821_fh *fh = priv;
	struct cx25821_dev *dev = fh->dev;

	if (unlikely(fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE))
		return -EINVAL;

	if (unlikely(i != fh->type))
		return -EINVAL;

	if (unlikely(!cx25821_res_get(dev, fh, cx25821_get_resource(fh,
						RESOURCE_VIDEO0))))
		return -EBUSY;

	return videobuf_streamon(get_queue(fh));
}

static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
{
	struct cx25821_fh *fh = priv;
	struct cx25821_dev *dev = fh->dev;
	int err, res;

	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	if (i != fh->type)
		return -EINVAL;

	res = cx25821_get_resource(fh, RESOURCE_VIDEO0);
	err = videobuf_streamoff(get_queue(fh));
	if (err < 0)
		return err;
	cx25821_res_free(dev, fh, res);
	return 0;
}

static int cx25821_is_valid_width(u32 width, v4l2_std_id tvnorm)
{
	if (tvnorm == V4L2_STD_PAL_BG) {
		if (width == 352 || width == 720)
			return 1;
		else
			return 0;
	}

	if (tvnorm == V4L2_STD_NTSC_M) {
		if (width == 320 || width == 352 || width == 720)
			return 1;
		else
			return 0;
	}
	return 0;
}

static int cx25821_is_valid_height(u32 height, v4l2_std_id tvnorm)
{
	if (tvnorm == V4L2_STD_PAL_BG) {
		if (height == 576 || height == 288)
			return 1;
		else
			return 0;
	}

	if (tvnorm == V4L2_STD_NTSC_M) {
		if (height == 480 || height == 240)
			return 1;
		else
			return 0;
	}

	return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct cx25821_fh *fh = priv;
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
	struct v4l2_mbus_framefmt mbus_fmt;
	int err;
	int pix_format = PIXEL_FRMT_422;

	if (fh) {
		err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
				      fh->prio);
		if (0 != err)
			return err;
	}

	err = cx25821_vidioc_try_fmt_vid_cap(file, priv, f);

	if (0 != err)
		return err;

	fh->fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
	fh->vidq.field = f->fmt.pix.field;

	/* check if width and height is valid based on set standard */
	if (cx25821_is_valid_width(f->fmt.pix.width, dev->tvnorm))
		fh->width = f->fmt.pix.width;

	if (cx25821_is_valid_height(f->fmt.pix.height, dev->tvnorm))
		fh->height = f->fmt.pix.height;

	if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_Y41P)
		pix_format = PIXEL_FRMT_411;
	else if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_YUYV)
		pix_format = PIXEL_FRMT_422;
	else
		return -EINVAL;

	cx25821_set_pixel_format(dev, SRAM_CH00, pix_format);

	/* check if cif resolution */
	if (fh->width == 320 || fh->width == 352)
		dev->channels[fh->channel_id].use_cif_resolution = 1;
	else
		dev->channels[fh->channel_id].use_cif_resolution = 0;

	dev->channels[fh->channel_id].cif_width = fh->width;
	medusa_set_resolution(dev, fh->width, SRAM_CH00);

	v4l2_fill_mbus_format(&mbus_fmt, &f->fmt.pix, V4L2_MBUS_FMT_FIXED);
	cx25821_call_all(dev, video, s_mbus_fmt, &mbus_fmt);

	return 0;
}

static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
	int ret_val = 0;
	struct cx25821_fh *fh = priv;
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

	ret_val = videobuf_dqbuf(get_queue(fh), p, file->f_flags & O_NONBLOCK);

	p->sequence = dev->channels[fh->channel_id].vidq.count;

	return ret_val;
}

static int vidioc_log_status(struct file *file, void *priv)
{
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
	struct cx25821_fh *fh = priv;
	const struct sram_channel *sram_ch =
		dev->channels[fh->channel_id].sram_channels;
	u32 tmp = 0;

	cx25821_call_all(dev, core, log_status);
	tmp = cx_read(sram_ch->dma_ctl);
	pr_info("Video input 0 is %s\n",
		(tmp & 0x11) ? "streaming" : "stopped");
	return 0;
}


static int cx25821_vidioc_querycap(struct file *file, void *priv,
			    struct v4l2_capability *cap)
{
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
	struct cx25821_fh *fh = priv;
	const u32 cap_input = V4L2_CAP_VIDEO_CAPTURE |
			V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
	const u32 cap_output = V4L2_CAP_VIDEO_OUTPUT;

	strcpy(cap->driver, "cx25821");
	strlcpy(cap->card, cx25821_boards[dev->board].name, sizeof(cap->card));
	sprintf(cap->bus_info, "PCIe:%s", pci_name(dev->pci));
	if (fh->channel_id >= VID_CHANNEL_NUM)
		cap->device_caps = cap_output;
	else
		cap->device_caps = cap_input;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	return 0;
}

static int cx25821_vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
			    struct v4l2_fmtdesc *f)
{
	if (unlikely(f->index >= ARRAY_SIZE(formats)))
		return -EINVAL;

	strlcpy(f->description, formats[f->index].name, sizeof(f->description));
	f->pixelformat = formats[f->index].fourcc;

	return 0;
}

static int cx25821_vidioc_reqbufs(struct file *file, void *priv,
			   struct v4l2_requestbuffers *p)
{
	struct cx25821_fh *fh = priv;
	return videobuf_reqbufs(get_queue(fh), p);
}

static int cx25821_vidioc_querybuf(struct file *file, void *priv,
			    struct v4l2_buffer *p)
{
	struct cx25821_fh *fh = priv;
	return videobuf_querybuf(get_queue(fh), p);
}

static int cx25821_vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
	struct cx25821_fh *fh = priv;
	return videobuf_qbuf(get_queue(fh), p);
}

static int cx25821_vidioc_g_priority(struct file *file, void *f, enum v4l2_priority *p)
{
	struct cx25821_dev *dev = ((struct cx25821_fh *)f)->dev;
	struct cx25821_fh *fh = f;

	*p = v4l2_prio_max(&dev->channels[fh->channel_id].prio);

	return 0;
}

static int cx25821_vidioc_s_priority(struct file *file, void *f,
			      enum v4l2_priority prio)
{
	struct cx25821_fh *fh = f;
	struct cx25821_dev *dev = ((struct cx25821_fh *)f)->dev;

	return v4l2_prio_change(&dev->channels[fh->channel_id].prio, &fh->prio,
			prio);
}

static int cx25821_vidioc_g_std(struct file *file, void *priv, v4l2_std_id *tvnorms)
{
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

	*tvnorms = dev->tvnorm;
	return 0;
}

int cx25821_vidioc_s_std(struct file *file, void *priv, v4l2_std_id tvnorms)
{
	struct cx25821_fh *fh = priv;
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
	int err;

	if (fh) {
		err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
				      fh->prio);
		if (0 != err)
			return err;
	}

	if (dev->tvnorm == tvnorms)
		return 0;

	cx25821_set_tvnorm(dev, tvnorms);

	medusa_set_videostandard(dev);

	return 0;
}

static int cx25821_vidioc_enum_input(struct file *file, void *priv,
			      struct v4l2_input *i)
{
	static const char * const iname[] = {
		[CX25821_VMUX_COMPOSITE] = "Composite",
		[CX25821_VMUX_SVIDEO] = "S-Video",
		[CX25821_VMUX_DEBUG] = "for debug only",
	};
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
	unsigned int n;

	n = i->index;
	if (n >= CX25821_NR_INPUT)
		return -EINVAL;

	if (0 == INPUT(n)->type)
		return -EINVAL;

	i->type = V4L2_INPUT_TYPE_CAMERA;
	strcpy(i->name, iname[INPUT(n)->type]);

	i->std = CX25821_NORMS;
	return 0;
}

static int cx25821_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

	*i = dev->input;
	return 0;
}

static int cx25821_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
	struct cx25821_fh *fh = priv;
	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
	int err;

	if (fh) {
		err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
				      fh->prio);
		if (0 != err)
			return err;
	}

	if (i >= CX25821_NR_INPUT || INPUT(i)->type == 0)
		return -EINVAL;

	cx25821_video_mux(dev, i);
	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
int cx25821_vidioc_g_register(struct file *file, void *fh,
		      struct v4l2_dbg_register *reg)
{
	struct cx25821_dev *dev = ((struct cx25821_fh *)fh)->dev;

	if (!v4l2_chip_match_host(&reg->match))
		return -EINVAL;

	cx25821_call_all(dev, core, g_register, reg);

	return 0;
}

int cx25821_vidioc_s_register(struct file *file, void *fh,
		      const struct v4l2_dbg_register *reg)
{
	struct cx25821_dev *dev = ((struct cx25821_fh *)fh)->dev;

	if (!v4l2_chip_match_host(&reg->match))
		return -EINVAL;

	cx25821_call_all(dev, core, s_register, reg);

	return 0;
}

#endif

static int cx25821_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct cx25821_channel *chan =
		container_of(ctrl->handler, struct cx25821_channel, hdl);
	struct cx25821_dev *dev = chan->dev;

	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		medusa_set_brightness(dev, ctrl->val, chan->id);
		break;
	case V4L2_CID_HUE:
		medusa_set_hue(dev, ctrl->val, chan->id);
		break;
	case V4L2_CID_CONTRAST:
		medusa_set_contrast(dev, ctrl->val, chan->id);
		break;
	case V4L2_CID_SATURATION:
		medusa_set_saturation(dev, ctrl->val, chan->id);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static long video_ioctl_upstream9(struct file *file, unsigned int cmd,
				 unsigned long arg)
{
	struct cx25821_fh *fh = file->private_data;
	struct cx25821_dev *dev = fh->dev;
	int command = 0;
	struct upstream_user_struct *data_from_user;

	data_from_user = (struct upstream_user_struct *)arg;

	if (!data_from_user) {
		pr_err("%s(): Upstream data is INVALID. Returning\n", __func__);
		return 0;
	}

	command = data_from_user->command;

	if (command != UPSTREAM_START_VIDEO && command != UPSTREAM_STOP_VIDEO)
		return 0;

	dev->input_filename = data_from_user->input_filename;
	dev->input_audiofilename = data_from_user->input_filename;
	dev->vid_stdname = data_from_user->vid_stdname;
	dev->pixel_format = data_from_user->pixel_format;
	dev->channel_select = data_from_user->channel_select;
	dev->command = data_from_user->command;

	switch (command) {
	case UPSTREAM_START_VIDEO:
		cx25821_start_upstream_video_ch1(dev, data_from_user);
		break;

	case UPSTREAM_STOP_VIDEO:
		cx25821_stop_upstream_video_ch1(dev);
		break;
	}

	return 0;
}

static long video_ioctl_upstream10(struct file *file, unsigned int cmd,
				  unsigned long arg)
{
	struct cx25821_fh *fh = file->private_data;
	struct cx25821_dev *dev = fh->dev;
	int command = 0;
	struct upstream_user_struct *data_from_user;

	data_from_user = (struct upstream_user_struct *)arg;

	if (!data_from_user) {
		pr_err("%s(): Upstream data is INVALID. Returning\n", __func__);
		return 0;
	}

	command = data_from_user->command;

	if (command != UPSTREAM_START_VIDEO && command != UPSTREAM_STOP_VIDEO)
		return 0;

	dev->input_filename_ch2 = data_from_user->input_filename;
	dev->input_audiofilename = data_from_user->input_filename;
	dev->vid_stdname_ch2 = data_from_user->vid_stdname;
	dev->pixel_format_ch2 = data_from_user->pixel_format;
	dev->channel_select_ch2 = data_from_user->channel_select;
	dev->command_ch2 = data_from_user->command;

	switch (command) {
	case UPSTREAM_START_VIDEO:
		cx25821_start_upstream_video_ch2(dev, data_from_user);
		break;

	case UPSTREAM_STOP_VIDEO:
		cx25821_stop_upstream_video_ch2(dev);
		break;
	}

	return 0;
}

static long video_ioctl_upstream11(struct file *file, unsigned int cmd,
				  unsigned long arg)
{
	struct cx25821_fh *fh = file->private_data;
	struct cx25821_dev *dev = fh->dev;
	int command = 0;
	struct upstream_user_struct *data_from_user;

	data_from_user = (struct upstream_user_struct *)arg;

	if (!data_from_user) {
		pr_err("%s(): Upstream data is INVALID. Returning\n", __func__);
		return 0;
	}

	command = data_from_user->command;

	if (command != UPSTREAM_START_AUDIO && command != UPSTREAM_STOP_AUDIO)
		return 0;

	dev->input_filename = data_from_user->input_filename;
	dev->input_audiofilename = data_from_user->input_filename;
	dev->vid_stdname = data_from_user->vid_stdname;
	dev->pixel_format = data_from_user->pixel_format;
	dev->channel_select = data_from_user->channel_select;
	dev->command = data_from_user->command;

	switch (command) {
	case UPSTREAM_START_AUDIO:
		cx25821_start_upstream_audio(dev, data_from_user);
		break;

	case UPSTREAM_STOP_AUDIO:
		cx25821_stop_upstream_audio(dev);
		break;
	}

	return 0;
}

static long video_ioctl_set(struct file *file, unsigned int cmd,
			   unsigned long arg)
{
	struct cx25821_fh *fh = file->private_data;
	struct cx25821_dev *dev = fh->dev;
	struct downstream_user_struct *data_from_user;
	int command;
	int width = 720;
	int selected_channel = 0;
	int pix_format = 0;
	int i = 0;
	int cif_enable = 0;
	int cif_width = 0;

	data_from_user = (struct downstream_user_struct *)arg;

	if (!data_from_user) {
		pr_err("%s(): User data is INVALID. Returning\n", __func__);
		return 0;
	}

	command = data_from_user->command;

	if (command != SET_VIDEO_STD && command != SET_PIXEL_FORMAT
	   && command != ENABLE_CIF_RESOLUTION && command != REG_READ
	   && command != REG_WRITE && command != MEDUSA_READ
	   && command != MEDUSA_WRITE) {
		return 0;
	}

	switch (command) {
	case SET_VIDEO_STD:
		if (!strcmp(data_from_user->vid_stdname, "PAL"))
			dev->tvnorm = V4L2_STD_PAL_BG;
		else
			dev->tvnorm = V4L2_STD_NTSC_M;
		medusa_set_videostandard(dev);
		break;

	case SET_PIXEL_FORMAT:
		selected_channel = data_from_user->decoder_select;
		pix_format = data_from_user->pixel_format;

		if (!(selected_channel <= 7 && selected_channel >= 0)) {
			selected_channel -= 4;
			selected_channel = selected_channel % 8;
		}

		if (selected_channel >= 0)
			cx25821_set_pixel_format(dev, selected_channel,
						pix_format);

		break;

	case ENABLE_CIF_RESOLUTION:
		selected_channel = data_from_user->decoder_select;
		cif_enable = data_from_user->cif_resolution_enable;
		cif_width = data_from_user->cif_width;

		if (cif_enable) {
			if (dev->tvnorm & V4L2_STD_PAL_BG
			    || dev->tvnorm & V4L2_STD_PAL_DK) {
				width = 352;
			} else {
				width = cif_width;
				if (cif_width != 320 && cif_width != 352)
					width = 320;
			}
		}

		if (!(selected_channel <= 7 && selected_channel >= 0)) {
			selected_channel -= 4;
			selected_channel = selected_channel % 8;
		}

		if (selected_channel <= 7 && selected_channel >= 0) {
			dev->channels[selected_channel].use_cif_resolution =
				cif_enable;
			dev->channels[selected_channel].cif_width = width;
		} else {
			for (i = 0; i < VID_CHANNEL_NUM; i++) {
				dev->channels[i].use_cif_resolution =
					cif_enable;
				dev->channels[i].cif_width = width;
			}
		}

		medusa_set_resolution(dev, width, selected_channel);
		break;
	case REG_READ:
		data_from_user->reg_data = cx_read(data_from_user->reg_address);
		break;
	case REG_WRITE:
		cx_write(data_from_user->reg_address, data_from_user->reg_data);
		break;
	case MEDUSA_READ:
		cx25821_i2c_read(&dev->i2c_bus[0],
					 (u16) data_from_user->reg_address,
					 &data_from_user->reg_data);
		break;
	case MEDUSA_WRITE:
		cx25821_i2c_write(&dev->i2c_bus[0],
				  (u16) data_from_user->reg_address,
				  data_from_user->reg_data);
		break;
	}

	return 0;
}

static long cx25821_video_ioctl(struct file *file,
				unsigned int cmd, unsigned long arg)
{
	int ret = 0;

	struct cx25821_fh *fh = file->private_data;

	/* check to see if it's the video upstream */
	if (fh->channel_id == SRAM_CH09) {
		ret = video_ioctl_upstream9(file, cmd, arg);
		return ret;
	} else if (fh->channel_id == SRAM_CH10) {
		ret = video_ioctl_upstream10(file, cmd, arg);
		return ret;
	} else if (fh->channel_id == SRAM_CH11) {
		ret = video_ioctl_upstream11(file, cmd, arg);
		ret = video_ioctl_set(file, cmd, arg);
		return ret;
	}

	return video_ioctl2(file, cmd, arg);
}

static const struct v4l2_ctrl_ops cx25821_ctrl_ops = {
	.s_ctrl = cx25821_s_ctrl,
};

static const struct v4l2_file_operations video_fops = {
	.owner = THIS_MODULE,
	.open = video_open,
	.release = video_release,
	.read = video_read,
	.poll = video_poll,
	.mmap = cx25821_video_mmap,
	.unlocked_ioctl = cx25821_video_ioctl,
};

static const struct v4l2_ioctl_ops video_ioctl_ops = {
	.vidioc_querycap = cx25821_vidioc_querycap,
	.vidioc_enum_fmt_vid_cap = cx25821_vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap = cx25821_vidioc_g_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap = cx25821_vidioc_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
	.vidioc_reqbufs = cx25821_vidioc_reqbufs,
	.vidioc_querybuf = cx25821_vidioc_querybuf,
	.vidioc_qbuf = cx25821_vidioc_qbuf,
	.vidioc_dqbuf = vidioc_dqbuf,
	.vidioc_g_std = cx25821_vidioc_g_std,
	.vidioc_s_std = cx25821_vidioc_s_std,
	.vidioc_enum_input = cx25821_vidioc_enum_input,
	.vidioc_g_input = cx25821_vidioc_g_input,
	.vidioc_s_input = cx25821_vidioc_s_input,
	.vidioc_streamon = vidioc_streamon,
	.vidioc_streamoff = vidioc_streamoff,
	.vidioc_log_status = vidioc_log_status,
	.vidioc_g_priority = cx25821_vidioc_g_priority,
	.vidioc_s_priority = cx25821_vidioc_s_priority,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register = cx25821_vidioc_g_register,
	.vidioc_s_register = cx25821_vidioc_s_register,
#endif
};

static const struct video_device cx25821_video_device = {
	.name = "cx25821-video",
	.fops = &video_fops,
	.release = video_device_release_empty,
	.minor = -1,
	.ioctl_ops = &video_ioctl_ops,
	.tvnorms = CX25821_NORMS,
};

void cx25821_video_unregister(struct cx25821_dev *dev, int chan_num)
{
	cx_clear(PCI_INT_MSK, 1);

	if (video_is_registered(&dev->channels[chan_num].vdev)) {
		video_unregister_device(&dev->channels[chan_num].vdev);
		v4l2_ctrl_handler_free(&dev->channels[chan_num].hdl);

		btcx_riscmem_free(dev->pci,
				&dev->channels[chan_num].vidq.stopper);
	}
}

int cx25821_video_register(struct cx25821_dev *dev)
{
	int err;
	int i;

	/* initial device configuration */
	dev->tvnorm = V4L2_STD_NTSC_M,
	cx25821_set_tvnorm(dev, dev->tvnorm);

	spin_lock_init(&dev->slock);

	for (i = 0; i < VID_CHANNEL_NUM; ++i) {
		struct video_device *vdev = &dev->channels[i].vdev;
		struct v4l2_ctrl_handler *hdl = &dev->channels[i].hdl;

		if (i == SRAM_CH08) /* audio channel */
			continue;

		v4l2_ctrl_handler_init(hdl, 4);
		v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
			V4L2_CID_BRIGHTNESS, 0, 10000, 1, 6200);
		v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
			V4L2_CID_CONTRAST, 0, 10000, 1, 5000);
		v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
			V4L2_CID_SATURATION, 0, 10000, 1, 5000);
		v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
			V4L2_CID_HUE, 0, 10000, 1, 5000);
		if (hdl->error) {
			err = hdl->error;
			goto fail_unreg;
		}
		err = v4l2_ctrl_handler_setup(hdl);
		if (err)
			goto fail_unreg;

		cx25821_risc_stopper(dev->pci, &dev->channels[i].vidq.stopper,
			dev->channels[i].sram_channels->dma_ctl, 0x11, 0);

		dev->channels[i].sram_channels = &cx25821_sram_channels[i];
		dev->channels[i].resources = 0;

		cx_write(dev->channels[i].sram_channels->int_stat, 0xffffffff);

		INIT_LIST_HEAD(&dev->channels[i].vidq.active);
		INIT_LIST_HEAD(&dev->channels[i].vidq.queued);

		dev->channels[i].timeout_data.dev = dev;
		dev->channels[i].timeout_data.channel =
			&cx25821_sram_channels[i];
		dev->channels[i].vidq.timeout.function = cx25821_vid_timeout;
		dev->channels[i].vidq.timeout.data =
			(unsigned long)&dev->channels[i].timeout_data;
		init_timer(&dev->channels[i].vidq.timeout);

		/* register v4l devices */
		*vdev = cx25821_video_device;
		vdev->v4l2_dev = &dev->v4l2_dev;
		vdev->ctrl_handler = hdl;
		vdev->lock = &dev->lock;
		snprintf(vdev->name, sizeof(vdev->name), "%s #%d", dev->name, i);
		video_set_drvdata(vdev, dev);

		err = video_register_device(vdev, VFL_TYPE_GRABBER,
					    video_nr[dev->nr]);

		if (err < 0)
			goto fail_unreg;
	}

	/* set PCI interrupt */
	cx_set(PCI_INT_MSK, 0xff);

	return 0;

fail_unreg:
	while (i >= 0)
		cx25821_video_unregister(dev, i--);
	return err;
}