drivers/media/video/saa7134/saa7134-empress.c - pub/scm/linux/kernel/git/daveh/linux - Git at Google

 /*
  * $Id: saa7134-empress.c,v 1.10 2005/02/03 10:24:33 kraxel Exp $
  *
  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
  *
  *  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.
  */

 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/delay.h>

 #include "saa7134-reg.h"
 #include "saa7134.h"

 #include <media/saa6752hs.h>

 /* ------------------------------------------------------------------ */

 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
 MODULE_LICENSE("GPL");

 static unsigned int empress_nr[] = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
 module_param_array(empress_nr, int, NULL, 0444);
 MODULE_PARM_DESC(empress_nr,"ts device number");

 static unsigned int debug = 0;
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug,"enable debug messages");

 #define dprintk(fmt, arg...)	if (debug)			\
 	printk(KERN_DEBUG "%s/empress: " fmt, dev->name , ## arg)

 /* ------------------------------------------------------------------ */

 static void ts_reset_encoder(struct saa7134_dev* dev)
 {
 	if (!dev->empress_started)
 		return;

 	saa_writeb(SAA7134_SPECIAL_MODE, 0x00);
 	msleep(10);
    	saa_writeb(SAA7134_SPECIAL_MODE, 0x01);
 	msleep(100);
 	dev->empress_started = 0;
 }

 static int ts_init_encoder(struct saa7134_dev* dev)
 {
 	ts_reset_encoder(dev);
 	saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, NULL);
 	dev->empress_started = 1;
  	return 0;
 }

 /* ------------------------------------------------------------------ */

 static int ts_open(struct inode *inode, struct file *file)
 {
 	int minor = iminor(inode);
 	struct saa7134_dev *h,*dev = NULL;
 	struct list_head *list;
 	int err;

 	list_for_each(list,&saa7134_devlist) {
 		h = list_entry(list, struct saa7134_dev, devlist);
 		if (h->empress_dev && h->empress_dev->minor == minor)
 			dev = h;
 	}
 	if (NULL == dev)
 		return -ENODEV;

 	dprintk("open minor=%d\n",minor);
 	err = -EBUSY;
 	if (down_trylock(&dev->empress_tsq.lock))
 		goto done;
 	if (dev->empress_users)
 		goto done_up;

 	dev->empress_users++;
 	file->private_data = dev;
 	err = 0;

 done_up:
 	up(&dev->empress_tsq.lock);
 done:
 	return err;
 }

 static int ts_release(struct inode *inode, struct file *file)
 {
 	struct saa7134_dev *dev = file->private_data;

 	if (dev->empress_tsq.streaming)
 		videobuf_streamoff(&dev->empress_tsq);
 	down(&dev->empress_tsq.lock);
 	if (dev->empress_tsq.reading)
 		videobuf_read_stop(&dev->empress_tsq);
 	videobuf_mmap_free(&dev->empress_tsq);
 	dev->empress_users--;

 	/* stop the encoder */
 	ts_reset_encoder(dev);

 	up(&dev->empress_tsq.lock);
 	return 0;
 }

 static ssize_t
 ts_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 {
 	struct saa7134_dev *dev = file->private_data;

 	if (!dev->empress_started)
 		ts_init_encoder(dev);

 	return videobuf_read_stream(&dev->empress_tsq,
 				    data, count, ppos, 0,
 				    file->f_flags & O_NONBLOCK);
 }

 static unsigned int
 ts_poll(struct file *file, struct poll_table_struct *wait)
 {
 	struct saa7134_dev *dev = file->private_data;

 	return videobuf_poll_stream(file, &dev->empress_tsq, wait);
 }


 static int
 ts_mmap(struct file *file, struct vm_area_struct * vma)
 {
 	struct saa7134_dev *dev = file->private_data;

 	return videobuf_mmap_mapper(&dev->empress_tsq, vma);
 }

 /*
  * This function is _not_ called directly, but from
  * video_generic_ioctl (and maybe others).  userspace
  * copying is done already, arg is a kernel pointer.
  */
 static int ts_do_ioctl(struct inode *inode, struct file *file,
 		       unsigned int cmd, void *arg)
 {
 	struct saa7134_dev *dev = file->private_data;

 	if (debug > 1)
 		saa7134_print_ioctl(dev->name,cmd);
 	switch (cmd) {
 	case VIDIOC_QUERYCAP:
 	{
 		struct v4l2_capability *cap = arg;

 		memset(cap,0,sizeof(*cap));
                 strcpy(cap->driver, "saa7134");
 		strlcpy(cap->card, saa7134_boards[dev->board].name,
 			sizeof(cap->card));
 		sprintf(cap->bus_info,"PCI:%s",pci_name(dev->pci));
 		cap->version = SAA7134_VERSION_CODE;
 		cap->capabilities =
 			V4L2_CAP_VIDEO_CAPTURE |
 			V4L2_CAP_READWRITE |
 			V4L2_CAP_STREAMING;
 		return 0;
 	}

 	/* --- input switching --------------------------------------- */
 	case VIDIOC_ENUMINPUT:
 	{
 		struct v4l2_input *i = arg;

 		if (i->index != 0)
 			return -EINVAL;
 		i->type = V4L2_INPUT_TYPE_CAMERA;
 		strcpy(i->name,"CCIR656");
 		return 0;
 	}
 	case VIDIOC_G_INPUT:
 	{
 		int *i = arg;
 		*i = 0;
 		return 0;
 	}
 	case VIDIOC_S_INPUT:
 	{
 		int *i = arg;

 		if (*i != 0)
 			return -EINVAL;
 		return 0;
 	}
 	/* --- capture ioctls ---------------------------------------- */

 	case VIDIOC_ENUM_FMT:
 	{
 		struct v4l2_fmtdesc *f = arg;
 		int index;

 		index = f->index;
 		if (index != 0)
 			return -EINVAL;

 		memset(f,0,sizeof(*f));
 		f->index = index;
 		strlcpy(f->description, "MPEG TS", sizeof(f->description));
 		f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 		f->pixelformat = V4L2_PIX_FMT_MPEG;
 		return 0;
 	}

 	case VIDIOC_G_FMT:
 	{
 		struct v4l2_format *f = arg;

 		memset(f,0,sizeof(*f));
 		f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

 		/* FIXME: translate subsampling type EMPRESS into
 		 *        width/height: */
 		f->fmt.pix.width        = 720; /* D1 */
 		f->fmt.pix.height       = 576;
 		f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 		f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
 		return 0;
 	}

 	case VIDIOC_S_FMT:
 	{
 		struct v4l2_format *f = arg;

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

 		/*
 		  FIXME: translate and round width/height into EMPRESS
 		  subsample type:

 		          type  |   PAL   |  NTSC
 			---------------------------
 			  SIF   | 352x288 | 352x240
 			 1/2 D1 | 352x576 | 352x480
 			 2/3 D1 | 480x576 | 480x480
 			  D1    | 720x576 | 720x480
 		*/

 		f->fmt.pix.width        = 720; /* D1 */
 		f->fmt.pix.height       = 576;
 		f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 		f->fmt.pix.sizeimage    = TS_PACKET_SIZE* dev->ts.nr_packets;
 		return 0;
 	}

 	case VIDIOC_REQBUFS:
 		return videobuf_reqbufs(&dev->empress_tsq,arg);

 	case VIDIOC_QUERYBUF:
 		return videobuf_querybuf(&dev->empress_tsq,arg);

 	case VIDIOC_QBUF:
 		return videobuf_qbuf(&dev->empress_tsq,arg);

 	case VIDIOC_DQBUF:
 		return videobuf_dqbuf(&dev->empress_tsq,arg,
 				      file->f_flags & O_NONBLOCK);

 	case VIDIOC_STREAMON:
 		return videobuf_streamon(&dev->empress_tsq);

 	case VIDIOC_STREAMOFF:
 		return videobuf_streamoff(&dev->empress_tsq);

 	case VIDIOC_QUERYCTRL:
 	case VIDIOC_G_CTRL:
 	case VIDIOC_S_CTRL:
 		return saa7134_common_ioctl(dev, cmd, arg);

 	case VIDIOC_S_MPEGCOMP:
 		saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, arg);
 		ts_init_encoder(dev);
 		return 0;
 	case VIDIOC_G_MPEGCOMP:
 		saa7134_i2c_call_clients(dev, VIDIOC_G_MPEGCOMP, arg);
 		return 0;

 	default:
 		return -ENOIOCTLCMD;
 	}
 	return 0;
 }

 static int ts_ioctl(struct inode *inode, struct file *file,
 		     unsigned int cmd, unsigned long arg)
 {
 	return video_usercopy(inode, file, cmd, arg, ts_do_ioctl);
 }

 static struct file_operations ts_fops =
 {
 	.owner	  = THIS_MODULE,
 	.open	  = ts_open,
 	.release  = ts_release,
 	.read	  = ts_read,
 	.poll	  = ts_poll,
 	.mmap	  = ts_mmap,
 	.ioctl	  = ts_ioctl,
 	.llseek   = no_llseek,
 };

 /* ----------------------------------------------------------- */

 static struct video_device saa7134_empress_template =
 {
 	.name          = "saa7134-empress",
 	.type          = 0 /* FIXME */,
 	.type2         = 0 /* FIXME */,
 	.hardware      = 0,
 	.fops          = &ts_fops,
 	.minor	       = -1,
 };

 static void empress_signal_update(void* data)
 {
 	struct saa7134_dev* dev = (struct saa7134_dev*) data;

 	if (dev->nosignal) {
 		dprintk("no video signal\n");
 		ts_reset_encoder(dev);
 	} else {
 		dprintk("video signal acquired\n");
 		if (dev->empress_users)
 			ts_init_encoder(dev);
 	}
 }

 static void empress_signal_change(struct saa7134_dev *dev)
 {
 	schedule_work(&dev->empress_workqueue);
 }


 static int empress_init(struct saa7134_dev *dev)
 {
 	int err;

 	dprintk("%s: %s\n",dev->name,__FUNCTION__);
 	dev->empress_dev = video_device_alloc();
 	if (NULL == dev->empress_dev)
 		return -ENOMEM;
 	*(dev->empress_dev) = saa7134_empress_template;
 	dev->empress_dev->dev     = &dev->pci->dev;
 	dev->empress_dev->release = video_device_release;
 	snprintf(dev->empress_dev->name, sizeof(dev->empress_dev->name),
 		 "%s empress (%s)", dev->name,
 		 saa7134_boards[dev->board].name);

 	INIT_WORK(&dev->empress_workqueue, empress_signal_update, (void*) dev);

 	err = video_register_device(dev->empress_dev,VFL_TYPE_GRABBER,
 				    empress_nr[dev->nr]);
 	if (err < 0) {
 		printk(KERN_INFO "%s: can't register video device\n",
 		       dev->name);
 		video_device_release(dev->empress_dev);
 		dev->empress_dev = NULL;
 		return err;
 	}
 	printk(KERN_INFO "%s: registered device video%d [mpeg]\n",
 	       dev->name,dev->empress_dev->minor & 0x1f);

 	videobuf_queue_init(&dev->empress_tsq, &saa7134_ts_qops,
 			    dev->pci, &dev->slock,
 			    V4L2_BUF_TYPE_VIDEO_CAPTURE,
 			    V4L2_FIELD_ALTERNATE,
 			    sizeof(struct saa7134_buf),
 			    dev);

 	empress_signal_update(dev);
 	return 0;
 }

 static int empress_fini(struct saa7134_dev *dev)
 {
 	dprintk("%s: %s\n",dev->name,__FUNCTION__);

 	if (NULL == dev->empress_dev)
 		return 0;
 	flush_scheduled_work();
 	video_unregister_device(dev->empress_dev);
 	dev->empress_dev = NULL;
 	return 0;
 }

 static struct saa7134_mpeg_ops empress_ops = {
 	.type          = SAA7134_MPEG_EMPRESS,
 	.init          = empress_init,
 	.fini          = empress_fini,
 	.signal_change = empress_signal_change,
 };

 static int __init empress_register(void)
 {
 	return saa7134_ts_register(&empress_ops);
 }

 static void __exit empress_unregister(void)
 {
 	saa7134_ts_unregister(&empress_ops);
 }

 module_init(empress_register);
 module_exit(empress_unregister);

 /* ----------------------------------------------------------- */
 /*
  * Local variables:
  * c-basic-offset: 8
  * End:
  */
	/*
	* $Id: saa7134-empress.c,v 1.10 2005/02/03 10:24:33 kraxel Exp $
	*
	* (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
	*
	* 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.
	*/

	#include <linux/init.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/delay.h>

	#include "saa7134-reg.h"
	#include "saa7134.h"

	#include <media/saa6752hs.h>

	/* ------------------------------------------------------------------ */

	MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
	MODULE_LICENSE("GPL");

	static unsigned int empress_nr[] = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
	module_param_array(empress_nr, int, NULL, 0444);
	MODULE_PARM_DESC(empress_nr,"ts device number");

	static unsigned int debug = 0;
	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug,"enable debug messages");

	#define dprintk(fmt, arg...) if (debug) \
	printk(KERN_DEBUG "%s/empress: " fmt, dev->name , ## arg)

	/* ------------------------------------------------------------------ */

	static void ts_reset_encoder(struct saa7134_dev* dev)
	{
	if (!dev->empress_started)
	return;

	saa_writeb(SAA7134_SPECIAL_MODE, 0x00);
	msleep(10);
	saa_writeb(SAA7134_SPECIAL_MODE, 0x01);
	msleep(100);
	dev->empress_started = 0;
	}

	static int ts_init_encoder(struct saa7134_dev* dev)
	{
	ts_reset_encoder(dev);
	saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, NULL);
	dev->empress_started = 1;
	return 0;
	}

	/* ------------------------------------------------------------------ */

	static int ts_open(struct inode inode, struct file file)
	{
	int minor = iminor(inode);
	struct saa7134_dev h,dev = NULL;
	struct list_head *list;
	int err;

	list_for_each(list,&saa7134_devlist) {
	h = list_entry(list, struct saa7134_dev, devlist);
	if (h->empress_dev && h->empress_dev->minor == minor)
	dev = h;
	}
	if (NULL == dev)
	return -ENODEV;

	dprintk("open minor=%d\n",minor);
	err = -EBUSY;
	if (down_trylock(&dev->empress_tsq.lock))
	goto done;
	if (dev->empress_users)
	goto done_up;

	dev->empress_users++;
	file->private_data = dev;
	err = 0;

	done_up:
	up(&dev->empress_tsq.lock);
	done:
	return err;
	}

	static int ts_release(struct inode inode, struct file file)
	{
	struct saa7134_dev *dev = file->private_data;

	if (dev->empress_tsq.streaming)
	videobuf_streamoff(&dev->empress_tsq);
	down(&dev->empress_tsq.lock);
	if (dev->empress_tsq.reading)
	videobuf_read_stop(&dev->empress_tsq);
	videobuf_mmap_free(&dev->empress_tsq);
	dev->empress_users--;

	/* stop the encoder */
	ts_reset_encoder(dev);

	up(&dev->empress_tsq.lock);
	return 0;
	}

	static ssize_t
	ts_read(struct file file, char __user data, size_t count, loff_t *ppos)
	{
	struct saa7134_dev *dev = file->private_data;

	if (!dev->empress_started)
	ts_init_encoder(dev);

	return videobuf_read_stream(&dev->empress_tsq,
	data, count, ppos, 0,
	file->f_flags & O_NONBLOCK);
	}

	static unsigned int
	ts_poll(struct file file, struct poll_table_struct wait)
	{
	struct saa7134_dev *dev = file->private_data;

	return videobuf_poll_stream(file, &dev->empress_tsq, wait);
	}


	static int
	ts_mmap(struct file file, struct vm_area_struct vma)
	{
	struct saa7134_dev *dev = file->private_data;

	return videobuf_mmap_mapper(&dev->empress_tsq, vma);
	}

	/*
	* This function is _not_ called directly, but from
	* video_generic_ioctl (and maybe others). userspace
	* copying is done already, arg is a kernel pointer.
	*/
	static int ts_do_ioctl(struct inode inode, struct file file,
	unsigned int cmd, void *arg)
	{
	struct saa7134_dev *dev = file->private_data;

	if (debug > 1)
	saa7134_print_ioctl(dev->name,cmd);
	switch (cmd) {
	case VIDIOC_QUERYCAP:
	{
	struct v4l2_capability *cap = arg;

	memset(cap,0,sizeof(*cap));
	strcpy(cap->driver, "saa7134");
	strlcpy(cap->card, saa7134_boards[dev->board].name,
	sizeof(cap->card));
	sprintf(cap->bus_info,"PCI:%s",pci_name(dev->pci));
	cap->version = SAA7134_VERSION_CODE;
	cap->capabilities =
	V4L2_CAP_VIDEO_CAPTURE \|
	V4L2_CAP_READWRITE \|
	V4L2_CAP_STREAMING;
	return 0;
	}

	/* --- input switching --------------------------------------- */
	case VIDIOC_ENUMINPUT:
	{
	struct v4l2_input *i = arg;

	if (i->index != 0)
	return -EINVAL;
	i->type = V4L2_INPUT_TYPE_CAMERA;
	strcpy(i->name,"CCIR656");
	return 0;
	}
	case VIDIOC_G_INPUT:
	{
	int *i = arg;
	*i = 0;
	return 0;
	}
	case VIDIOC_S_INPUT:
	{
	int *i = arg;

	if (*i != 0)
	return -EINVAL;
	return 0;
	}
	/* --- capture ioctls ---------------------------------------- */

	case VIDIOC_ENUM_FMT:
	{
	struct v4l2_fmtdesc *f = arg;
	int index;

	index = f->index;
	if (index != 0)
	return -EINVAL;

	memset(f,0,sizeof(*f));
	f->index = index;
	strlcpy(f->description, "MPEG TS", sizeof(f->description));
	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	f->pixelformat = V4L2_PIX_FMT_MPEG;
	return 0;
	}

	case VIDIOC_G_FMT:
	{
	struct v4l2_format *f = arg;

	memset(f,0,sizeof(*f));
	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

	/* FIXME: translate subsampling type EMPRESS into
	* width/height: */
	f->fmt.pix.width = 720; /* D1 */
	f->fmt.pix.height = 576;
	f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
	f->fmt.pix.sizeimage = TS_PACKET_SIZE * dev->ts.nr_packets;
	return 0;
	}

	case VIDIOC_S_FMT:
	{
	struct v4l2_format *f = arg;

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

	/*
	FIXME: translate and round width/height into EMPRESS
	subsample type:

	type \| PAL \| NTSC
	---------------------------
	SIF \| 352x288 \| 352x240
	1/2 D1 \| 352x576 \| 352x480
	2/3 D1 \| 480x576 \| 480x480
	D1 \| 720x576 \| 720x480
	*/

	f->fmt.pix.width = 720; /* D1 */
	f->fmt.pix.height = 576;
	f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
	f->fmt.pix.sizeimage = TS_PACKET_SIZE* dev->ts.nr_packets;
	return 0;
	}

	case VIDIOC_REQBUFS:
	return videobuf_reqbufs(&dev->empress_tsq,arg);

	case VIDIOC_QUERYBUF:
	return videobuf_querybuf(&dev->empress_tsq,arg);

	case VIDIOC_QBUF:
	return videobuf_qbuf(&dev->empress_tsq,arg);

	case VIDIOC_DQBUF:
	return videobuf_dqbuf(&dev->empress_tsq,arg,
	file->f_flags & O_NONBLOCK);

	case VIDIOC_STREAMON:
	return videobuf_streamon(&dev->empress_tsq);

	case VIDIOC_STREAMOFF:
	return videobuf_streamoff(&dev->empress_tsq);

	case VIDIOC_QUERYCTRL:
	case VIDIOC_G_CTRL:
	case VIDIOC_S_CTRL:
	return saa7134_common_ioctl(dev, cmd, arg);

	case VIDIOC_S_MPEGCOMP:
	saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, arg);
	ts_init_encoder(dev);
	return 0;
	case VIDIOC_G_MPEGCOMP:
	saa7134_i2c_call_clients(dev, VIDIOC_G_MPEGCOMP, arg);
	return 0;

	default:
	return -ENOIOCTLCMD;
	}
	return 0;
	}

	static int ts_ioctl(struct inode inode, struct file file,
	unsigned int cmd, unsigned long arg)
	{
	return video_usercopy(inode, file, cmd, arg, ts_do_ioctl);
	}

	static struct file_operations ts_fops =
	{
	.owner = THIS_MODULE,
	.open = ts_open,
	.release = ts_release,
	.read = ts_read,
	.poll = ts_poll,
	.mmap = ts_mmap,
	.ioctl = ts_ioctl,
	.llseek = no_llseek,
	};

	/* ----------------------------------------------------------- */

	static struct video_device saa7134_empress_template =
	{
	.name = "saa7134-empress",
	.type = 0 /* FIXME */,
	.type2 = 0 /* FIXME */,
	.hardware = 0,
	.fops = &ts_fops,
	.minor = -1,
	};

	static void empress_signal_update(void* data)
	{
	struct saa7134_dev* dev = (struct saa7134_dev*) data;

	if (dev->nosignal) {
	dprintk("no video signal\n");
	ts_reset_encoder(dev);
	} else {
	dprintk("video signal acquired\n");
	if (dev->empress_users)
	ts_init_encoder(dev);
	}
	}

	static void empress_signal_change(struct saa7134_dev *dev)
	{
	schedule_work(&dev->empress_workqueue);
	}


	static int empress_init(struct saa7134_dev *dev)
	{
	int err;

	dprintk("%s: %s\n",dev->name,__FUNCTION__);
	dev->empress_dev = video_device_alloc();
	if (NULL == dev->empress_dev)
	return -ENOMEM;
	*(dev->empress_dev) = saa7134_empress_template;
	dev->empress_dev->dev = &dev->pci->dev;
	dev->empress_dev->release = video_device_release;
	snprintf(dev->empress_dev->name, sizeof(dev->empress_dev->name),
	"%s empress (%s)", dev->name,
	saa7134_boards[dev->board].name);

	INIT_WORK(&dev->empress_workqueue, empress_signal_update, (void*) dev);

	err = video_register_device(dev->empress_dev,VFL_TYPE_GRABBER,
	empress_nr[dev->nr]);
	if (err < 0) {
	printk(KERN_INFO "%s: can't register video device\n",
	dev->name);
	video_device_release(dev->empress_dev);
	dev->empress_dev = NULL;
	return err;
	}
	printk(KERN_INFO "%s: registered device video%d [mpeg]\n",
	dev->name,dev->empress_dev->minor & 0x1f);

	videobuf_queue_init(&dev->empress_tsq, &saa7134_ts_qops,
	dev->pci, &dev->slock,
	V4L2_BUF_TYPE_VIDEO_CAPTURE,
	V4L2_FIELD_ALTERNATE,
	sizeof(struct saa7134_buf),
	dev);

	empress_signal_update(dev);
	return 0;
	}

	static int empress_fini(struct saa7134_dev *dev)
	{
	dprintk("%s: %s\n",dev->name,__FUNCTION__);

	if (NULL == dev->empress_dev)
	return 0;
	flush_scheduled_work();
	video_unregister_device(dev->empress_dev);
	dev->empress_dev = NULL;
	return 0;
	}

	static struct saa7134_mpeg_ops empress_ops = {
	.type = SAA7134_MPEG_EMPRESS,
	.init = empress_init,
	.fini = empress_fini,
	.signal_change = empress_signal_change,
	};

	static int __init empress_register(void)
	{
	return saa7134_ts_register(&empress_ops);
	}

	static void __exit empress_unregister(void)
	{
	saa7134_ts_unregister(&empress_ops);
	}

	module_init(empress_register);
	module_exit(empress_unregister);

	/* ----------------------------------------------------------- */
	/*
	* Local variables:
	* c-basic-offset: 8
	* End:
	*/