[PATCH] v4l: 716: support for em28xx board family

- Added support for em28xx board family

Signed-off-by: Ludovico Cavedon <cavedon@sssup.it>
Signed-off-by: Markus Rechberger <mrechberger@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1815 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
new file mode 100644
index 00000000000..a000131a8f5
--- /dev/null
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -0,0 +1,1815 @@
+/*
+   em2820-video.c - driver for Empia EM2820/2840 USB video capture devices
+
+   Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
+                      Ludovico Cavedon <cavedon@sssup.it>
+                      Mauro Carvalho Chehab <mchehab@brturbo.com.br>
+
+   Based on the em2800 driver from Sascha Sommer <saschasommer@freenet.de>
+
+   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/kernel.h>
+#include <linux/usb.h>
+#include <linux/videodev.h>
+#include <linux/i2c.h>
+#include <media/tuner.h>
+#include <linux/video_decoder.h>
+
+#include "em2820.h"
+
+#define DRIVER_AUTHOR "Markus Rechberger <mrechberger@gmail.com>, " \
+			"Ludovico Cavedon <cavedon@sssup.it>, " \
+			"Mauro Carvalho Chehab <mchehab@brturbo.com.br>"
+
+#define DRIVER_NAME         "em2820"
+#define DRIVER_DESC         "Empia em2820 based USB video device driver"
+#define EM2820_VERSION_CODE  KERNEL_VERSION(0, 0, 1)
+
+#define em2820_videodbg(fmt, arg...) do {\
+        if (video_debug) \
+                printk(KERN_INFO "%s %s :"fmt, \
+                         dev->name, __FUNCTION__ , ##arg); } while (0)
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+static int tuner = -1;
+module_param(tuner, int, 0444);
+MODULE_PARM_DESC(tuner, "tuner type");
+
+static unsigned int video_debug = 0;
+module_param(video_debug,int,0644);
+MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
+
+/* supported tv norms */
+static struct em2820_tvnorm tvnorms[] = {
+	{
+		.name = "PAL",
+		.id = V4L2_STD_PAL,
+		.mode = VIDEO_MODE_PAL,
+	 }, {
+		.name = "NTSC",
+		.id = V4L2_STD_NTSC,
+		.mode = VIDEO_MODE_NTSC,
+	}, {
+		 .name = "SECAM",
+		 .id = V4L2_STD_SECAM,
+		 .mode = VIDEO_MODE_SECAM,
+	}, {
+		.name = "PAL-M",
+		.id = V4L2_STD_PAL_M,
+		.mode = VIDEO_MODE_PAL,
+	}
+};
+
+#define TVNORMS ARRAY_SIZE(tvnorms)
+
+/* supported controls */
+static struct v4l2_queryctrl em2820_qctrl[] = {
+	{
+		.id = V4L2_CID_BRIGHTNESS,
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.name = "Brightness",
+		.minimum = -128,
+		.maximum = 127,
+		.step = 1,
+		.default_value = 0,
+		.flags = 0,
+	},{
+		.id = V4L2_CID_CONTRAST,
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.name = "Contrast",
+		.minimum = 0x0,
+		.maximum = 0x1f,
+		.step = 0x1,
+		.default_value = 0x10,
+		.flags = 0,
+	},{
+		.id = V4L2_CID_SATURATION,
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.name = "Saturation",
+		.minimum = 0x0,
+		.maximum = 0x1f,
+		.step = 0x1,
+		.default_value = 0x10,
+		.flags = 0,
+	},{
+		.id = V4L2_CID_AUDIO_VOLUME,
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.name = "Volume",
+		.minimum = 0x0,
+		.maximum = 0x1f,
+		.step = 0x1,
+		.default_value = 0x1f,
+		.flags = 0,
+	},{
+		.id = V4L2_CID_AUDIO_MUTE,
+		.type = V4L2_CTRL_TYPE_BOOLEAN,
+		.name = "Mute",
+		.minimum = 0,
+		.maximum = 1,
+		.step = 1,
+		.default_value = 1,
+		.flags = 0,
+	},{
+		.id = V4L2_CID_RED_BALANCE,
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.name = "Red chroma balance",
+		.minimum = -128,
+		.maximum = 127,
+		.step = 1,
+		.default_value = 0,
+		.flags = 0,
+	},{
+		.id = V4L2_CID_BLUE_BALANCE,
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.name = "Blue chroma balance",
+		.minimum = -128,
+		.maximum = 127,
+		.step = 1,
+		.default_value = 0,
+		.flags = 0,
+	},{
+		.id = V4L2_CID_GAMMA,
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.name = "Gamma",
+		.minimum = 0x0,
+		.maximum = 0x3f,
+		.step = 0x1,
+		.default_value = 0x20,
+		.flags = 0,
+	 }
+};
+
+static struct usb_driver em2820_usb_driver;
+
+static DECLARE_MUTEX(em2820_sysfs_lock);
+static DECLARE_RWSEM(em2820_disconnect);
+
+/*********************  v4l2 interface  ******************************************/
+
+static inline unsigned long kvirt_to_pa(unsigned long adr)
+{
+	unsigned long kva, ret;
+
+	kva = (unsigned long)page_address(vmalloc_to_page((void *)adr));
+	kva |= adr & (PAGE_SIZE - 1);
+	ret = __pa(kva);
+	return ret;
+}
+
+/*
+ * em2820_config()
+ * inits registers with sane defaults
+ */
+static int em2820_config(struct em2820 *dev)
+{
+
+	/* Sets I2C speed to 100 KHz */
+	em2820_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
+
+	/* enable vbi capturing */
+	em2820_audio_usb_mute(dev, 1);
+	dev->mute = 1;		/* maybe not the right place... */
+	dev->volume = 0x1f;
+	em2820_audio_analog_set(dev);
+	em2820_audio_analog_setup(dev);
+	em2820_outfmt_set_yuv422(dev);
+	em2820_colorlevels_set_default(dev);
+	em2820_compression_disable(dev);
+
+	return 0;
+}
+
+/*
+ * em2820_config_i2c()
+ * configure i2c attached devices
+ */
+void em2820_config_i2c(struct em2820 *dev)
+{
+	struct v4l2_frequency f;
+	struct video_decoder_init em2820_vdi = {.data = NULL };
+
+
+	/* configure decoder */
+	em2820_i2c_call_clients(dev, DECODER_INIT, &em2820_vdi);
+	em2820_i2c_call_clients(dev, DECODER_SET_INPUT, &dev->ctl_input);
+/*	em2820_i2c_call_clients(dev,DECODER_SET_PICTURE, &dev->vpic); */
+/*	em2820_i2c_call_clients(dev,DECODER_SET_NORM,&dev->tvnorm->id); */
+/*	em2820_i2c_call_clients(dev,DECODER_ENABLE_OUTPUT,&output); */
+/*	em2820_i2c_call_clients(dev,DECODER_DUMP, NULL); */
+
+	/* configure tuner */
+	f.tuner = 0;
+	f.type = V4L2_TUNER_ANALOG_TV;
+	f.frequency = 9076;	/* FIXME:remove magic number */
+	dev->ctl_freq = f.frequency;
+	em2820_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
+
+	/* configure tda9887 */
+
+	em2820_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
+
+/*	em2820_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
+}
+
+/*
+ * em2820_empty_framequeues()
+ * prepare queues for incoming and outgoing frames
+ */
+static void em2820_empty_framequeues(struct em2820 *dev)
+{
+	u32 i;
+
+	INIT_LIST_HEAD(&dev->inqueue);
+	INIT_LIST_HEAD(&dev->outqueue);
+
+	for (i = 0; i < EM2820_NUM_FRAMES; i++) {
+		dev->frame[i].state = F_UNUSED;
+		dev->frame[i].buf.bytesused = 0;
+	}
+}
+
+/*
+ * em2820_v4l2_open()
+ * inits the device and starts isoc transfer
+ */
+static int em2820_v4l2_open(struct inode *inode, struct file *filp)
+{
+	struct video_device *vdev = video_devdata(filp);
+	int minor = iminor(inode);
+	struct em2820 *dev = (struct em2820 *)video_get_drvdata(vdev);
+	int errCode = 0;
+
+	em2820_videodbg("users=%d", dev->users);
+
+	if (!down_read_trylock(&em2820_disconnect))
+		return -ERESTARTSYS;
+
+	if (dev->users) {
+		em2820_warn("this driver can be opened only once\n");
+		up_read(&em2820_disconnect);
+		return -EBUSY;
+	}
+
+/*	if(dev->vbi_dev->minor == minor){
+		dev->type=V4L2_BUF_TYPE_VBI_CAPTURE;
+	}*/
+	if (dev->vdev->minor == minor) {
+		dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	}
+
+	init_MUTEX(&dev->fileop_lock);	/* to 1 == available */
+	spin_lock_init(&dev->queue_lock);
+	init_waitqueue_head(&dev->wait_frame);
+	init_waitqueue_head(&dev->wait_stream);
+
+	down(&dev->lock);
+
+	em2820_set_alternate(dev);
+
+	dev->width = norm_maxw(dev);
+	dev->height = norm_maxh(dev);
+	dev->frame_size = dev->width * dev->height * 2;
+	dev->field_size = dev->frame_size >> 1;	/*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
+	dev->bytesperline = dev->width * 2;
+	dev->hscale = 0;
+	dev->vscale = 0;
+
+	em2820_capture_start(dev, 1);
+	em2820_resolution_set(dev);
+
+	/* start the transfer */
+	errCode = em2820_init_isoc(dev);
+	if (errCode)
+		goto err;
+
+	dev->users++;
+	filp->private_data = dev;
+	dev->io = IO_NONE;
+	dev->stream = STREAM_OFF;
+	dev->num_frames = 0;
+
+	/* prepare queues */
+	em2820_empty_framequeues(dev);
+
+	dev->state |= DEV_INITIALIZED;
+
+      err:
+	up(&dev->lock);
+	up_read(&em2820_disconnect);
+	return errCode;
+}
+
+/*
+ * em2820_realease_resources()
+ * unregisters the v4l2,i2c and usb devices
+ * called when the device gets disconected or at module unload
+*/
+static void em2820_release_resources(struct em2820 *dev)
+{
+	down(&em2820_sysfs_lock);
+
+	em2820_info("V4L2 device /dev/video%d deregistered\n",
+		    dev->vdev->minor);
+	video_set_drvdata(dev->vdev, NULL);
+	video_unregister_device(dev->vdev);
+/*	video_unregister_device(dev->vbi_dev); */
+	em2820_i2c_unregister(dev);
+	usb_put_dev(dev->udev);
+	up(&em2820_sysfs_lock);
+}
+
+/*
+ * em2820_v4l2_close()
+ * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
+ */
+static int em2820_v4l2_close(struct inode *inode, struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct em2820 *dev = (struct em2820 *)video_get_drvdata(vdev);
+	int errCode;
+
+	em2820_videodbg("users=%d", dev->users);
+
+	down(&dev->lock);
+
+	em2820_uninit_isoc(dev);
+
+	em2820_release_buffers(dev);
+
+	/* the device is already disconnect, free the remaining resources */
+	if (dev->state & DEV_DISCONNECTED) {
+		em2820_release_resources(dev);
+		up(&dev->lock);
+		kfree(dev);
+		return 0;
+	}
+
+	/* set alternate 0 */
+	dev->alt = 0;
+	em2820_videodbg("setting alternate 0");
+	errCode = usb_set_interface(dev->udev, 0, 0);
+	if (errCode < 0) {
+		em2820_errdev ("cannot change alternate number to 0 (error=%i)\n",
+		     errCode);
+	}
+
+	dev->users--;
+	wake_up_interruptible_nr(&dev->open, 1);
+	up(&dev->lock);
+	return 0;
+}
+
+/*
+ * em2820_v4l2_read()
+ * will allocate buffers when called for the first time
+ */
+static ssize_t
+em2820_v4l2_read(struct file *filp, char __user * buf, size_t count,
+		 loff_t * f_pos)
+{
+	struct em2820 *dev = video_get_drvdata(video_devdata(filp));
+	struct em2820_frame_t *f, *i;
+	unsigned long lock_flags;
+	int ret = 0;
+
+	if (down_interruptible(&dev->fileop_lock))
+		return -ERESTARTSYS;
+
+	if (dev->state & DEV_DISCONNECTED) {
+		em2820_videodbg("device not present");
+		up(&dev->fileop_lock);
+		return -ENODEV;
+	}
+
+	if (dev->state & DEV_MISCONFIGURED) {
+		em2820_videodbg("device misconfigured; close and open it again");
+		up(&dev->fileop_lock);
+		return -EIO;
+	}
+
+	if (dev->io == IO_MMAP) {
+		em2820_videodbg ("IO method is set to mmap; close and open"
+				" the device again to choose the read method");
+		up(&dev->fileop_lock);
+		return -EINVAL;
+	}
+
+	if (dev->io == IO_NONE) {
+		if (!em2820_request_buffers(dev, EM2820_NUM_READ_FRAMES)) {
+			em2820_errdev("read failed, not enough memory\n");
+			up(&dev->fileop_lock);
+			return -ENOMEM;
+		}
+		dev->io = IO_READ;
+		dev->stream = STREAM_ON;
+		em2820_queue_unusedframes(dev);
+	}
+
+	if (!count) {
+		up(&dev->fileop_lock);
+		return 0;
+	}
+
+	if (list_empty(&dev->outqueue)) {
+		if (filp->f_flags & O_NONBLOCK) {
+			up(&dev->fileop_lock);
+			return -EAGAIN;
+		}
+		ret = wait_event_interruptible
+		    (dev->wait_frame,
+		     (!list_empty(&dev->outqueue)) ||
+		     (dev->state & DEV_DISCONNECTED));
+		if (ret) {
+			up(&dev->fileop_lock);
+			return ret;
+		}
+		if (dev->state & DEV_DISCONNECTED) {
+			up(&dev->fileop_lock);
+			return -ENODEV;
+		}
+	}
+
+	f = list_entry(dev->outqueue.prev, struct em2820_frame_t, frame);
+
+	spin_lock_irqsave(&dev->queue_lock, lock_flags);
+	list_for_each_entry(i, &dev->outqueue, frame)
+	    i->state = F_UNUSED;
+	INIT_LIST_HEAD(&dev->outqueue);
+	spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
+
+	em2820_queue_unusedframes(dev);
+
+	if (count > f->buf.length)
+		count = f->buf.length;
+
+	if (copy_to_user(buf, f->bufmem, count)) {
+		up(&dev->fileop_lock);
+		return -EFAULT;
+	}
+	*f_pos += count;
+
+	up(&dev->fileop_lock);
+
+	return count;
+}
+
+/*
+ * em2820_v4l2_poll()
+ * will allocate buffers when called for the first time
+ */
+static unsigned int em2820_v4l2_poll(struct file *filp, poll_table * wait)
+{
+	struct em2820 *dev = video_get_drvdata(video_devdata(filp));
+	unsigned int mask = 0;
+
+	if (down_interruptible(&dev->fileop_lock))
+		return POLLERR;
+
+	if (dev->state & DEV_DISCONNECTED) {
+		em2820_videodbg("device not present");
+	} else if (dev->state & DEV_MISCONFIGURED) {
+		em2820_videodbg("device is misconfigured; close and open it again");
+	} else {
+		if (dev->io == IO_NONE) {
+			if (!em2820_request_buffers
+			    (dev, EM2820_NUM_READ_FRAMES)) {
+				em2820_warn
+				    ("poll() failed, not enough memory\n");
+			} else {
+				dev->io = IO_READ;
+				dev->stream = STREAM_ON;
+			}
+		}
+
+		if (dev->io == IO_READ) {
+			em2820_queue_unusedframes(dev);
+			poll_wait(filp, &dev->wait_frame, wait);
+
+			if (!list_empty(&dev->outqueue))
+				mask |= POLLIN | POLLRDNORM;
+
+			up(&dev->fileop_lock);
+
+			return mask;
+		}
+	}
+
+	up(&dev->fileop_lock);
+	return POLLERR;
+}
+
+/*
+ * em2820_vm_open()
+ */
+static void em2820_vm_open(struct vm_area_struct *vma)
+{
+	struct em2820_frame_t *f = vma->vm_private_data;
+	f->vma_use_count++;
+}
+
+/*
+ * em2820_vm_close()
+ */
+static void em2820_vm_close(struct vm_area_struct *vma)
+{
+	/* NOTE: buffers are not freed here */
+	struct em2820_frame_t *f = vma->vm_private_data;
+	f->vma_use_count--;
+}
+
+static struct vm_operations_struct em2820_vm_ops = {
+	.open = em2820_vm_open,
+	.close = em2820_vm_close,
+};
+
+/*
+ * em2820_v4l2_mmap()
+ */
+static int em2820_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct em2820 *dev = video_get_drvdata(video_devdata(filp));
+	unsigned long size = vma->vm_end - vma->vm_start,
+	    start = vma->vm_start, pos, page;
+	u32 i;
+	if (down_interruptible(&dev->fileop_lock))
+		return -ERESTARTSYS;
+
+	if (dev->state & DEV_DISCONNECTED) {
+		em2820_videodbg("mmap: device not present");
+		up(&dev->fileop_lock);
+		return -ENODEV;
+	}
+
+	if (dev->state & DEV_MISCONFIGURED) {
+		em2820_videodbg ("mmap: Device is misconfigured; close and "
+						"open it again");
+		up(&dev->fileop_lock);
+		return -EIO;
+	}
+
+	if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
+	    size != PAGE_ALIGN(dev->frame[0].buf.length)) {
+		up(&dev->fileop_lock);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < dev->num_frames; i++) {
+		if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
+			break;
+	}
+	if (i == dev->num_frames) {
+		em2820_videodbg("mmap: user supplied mapping address is out of range");
+		up(&dev->fileop_lock);
+		return -EINVAL;
+	}
+
+	/* VM_IO is eventually going to replace PageReserved altogether */
+	vma->vm_flags |= VM_IO;
+	vma->vm_flags |= VM_RESERVED;	/* avoid to swap out this VMA */
+
+	pos = (unsigned long)dev->frame[i].bufmem;
+	while (size > 0) {	/* size is page-aligned */
+		page = vmalloc_to_pfn((void *)pos);
+		if (remap_pfn_range(vma, start, page, PAGE_SIZE,
+				    vma->vm_page_prot)) {
+			em2820_videodbg("mmap: rename page map failed");
+			up(&dev->fileop_lock);
+			return -EAGAIN;
+		}
+		start += PAGE_SIZE;
+		pos += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
+
+	vma->vm_ops = &em2820_vm_ops;
+	vma->vm_private_data = &dev->frame[i];
+
+	em2820_vm_open(vma);
+	up(&dev->fileop_lock);
+	return 0;
+}
+
+/*
+ * em2820_get_ctrl()
+ * return the current saturation, brightness or contrast, mute state
+ */
+static int em2820_get_ctrl(struct em2820 *dev, struct v4l2_control *ctrl)
+{
+	s32 tmp;
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_MUTE:
+		ctrl->value = dev->mute;
+		return 0;
+	case V4L2_CID_AUDIO_VOLUME:
+		ctrl->value = dev->volume;
+		return 0;
+	case V4L2_CID_BRIGHTNESS:
+		if ((tmp = em2820_brightness_get(dev)) < 0)
+			return -EIO;
+		ctrl->value = (s32) ((s8) tmp);	/* FIXME: clenaer way to extend sign? */
+		return 0;
+	case V4L2_CID_CONTRAST:
+		if ((ctrl->value = em2820_contrast_get(dev)) < 0)
+			return -EIO;
+		return 0;
+	case V4L2_CID_SATURATION:
+		if ((ctrl->value = em2820_saturation_get(dev)) < 0)
+			return -EIO;
+		return 0;
+	case V4L2_CID_RED_BALANCE:
+		if ((tmp = em2820_v_balance_get(dev)) < 0)
+			return -EIO;
+		ctrl->value = (s32) ((s8) tmp);	/* FIXME: clenaer way to extend sign? */
+		return 0;
+	case V4L2_CID_BLUE_BALANCE:
+		if ((tmp = em2820_u_balance_get(dev)) < 0)
+			return -EIO;
+		ctrl->value = (s32) ((s8) tmp);	/* FIXME: clenaer way to extend sign? */
+		return 0;
+	case V4L2_CID_GAMMA:
+		if ((ctrl->value = em2820_gamma_get(dev)) < 0)
+			return -EIO;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+/*
+ * em2820_set_ctrl()
+ * mute or set new saturation, brightness or contrast
+ */
+static int em2820_set_ctrl(struct em2820 *dev, const struct v4l2_control *ctrl)
+{
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_MUTE:
+		if (ctrl->value != dev->mute) {
+			dev->mute = ctrl->value;
+			em2820_audio_usb_mute(dev, ctrl->value);
+			return em2820_audio_analog_set(dev);
+		}
+		return 0;
+	case V4L2_CID_AUDIO_VOLUME:
+		dev->volume = ctrl->value;
+		return em2820_audio_analog_set(dev);
+	case V4L2_CID_BRIGHTNESS:
+		return em2820_brightness_set(dev, ctrl->value);
+	case V4L2_CID_CONTRAST:
+		return em2820_contrast_set(dev, ctrl->value);
+	case V4L2_CID_SATURATION:
+		return em2820_saturation_set(dev, ctrl->value);
+	case V4L2_CID_RED_BALANCE:
+		return em2820_v_balance_set(dev, ctrl->value);
+	case V4L2_CID_BLUE_BALANCE:
+		return em2820_u_balance_set(dev, ctrl->value);
+	case V4L2_CID_GAMMA:
+		return em2820_gamma_set(dev, ctrl->value);
+	default:
+		return -EINVAL;
+	}
+}
+
+/*
+ * em2820_stream_interrupt()
+ * stops streaming
+ */
+static int em2820_stream_interrupt(struct em2820 *dev)
+{
+	int ret = 0;
+
+	/* stop reading from the device */
+
+	dev->stream = STREAM_INTERRUPT;
+	ret = wait_event_timeout(dev->wait_stream,
+				 (dev->stream == STREAM_OFF) ||
+				 (dev->state & DEV_DISCONNECTED),
+				 EM2820_URB_TIMEOUT);
+	if (dev->state & DEV_DISCONNECTED)
+		return -ENODEV;
+	else if (ret) {
+		dev->state |= DEV_MISCONFIGURED;
+		em2820_videodbg("device is misconfigured; close and "
+			"open /dev/video%d again", dev->vdev->minor);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int em2820_set_norm(struct em2820 *dev, int width, int height)
+{
+	unsigned int hscale, vscale;
+	unsigned int maxh, maxw;
+
+	maxw = norm_maxw(dev);
+	maxh = norm_maxh(dev);
+
+	/* width must even because of the YUYV format */
+	/* height must be even because of interlacing */
+	height &= 0xfffe;
+	width &= 0xfffe;
+
+	if (height < 32)
+		height = 32;
+	if (height > maxh)
+		height = maxh;
+	if (width < 48)
+		width = 48;
+	if (width > maxw)
+		width = maxw;
+
+	if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
+		hscale = 0x3fff;
+	width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
+
+	if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
+		vscale = 0x3fff;
+	height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
+
+	/* set new image size */
+	dev->width = width;
+	dev->height = height;
+	dev->frame_size = dev->width * dev->height * 2;
+	dev->field_size = dev->frame_size >> 1;	/*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
+	dev->bytesperline = dev->width * 2;
+	dev->hscale = hscale;
+	dev->vscale = vscale;
+
+	em2820_resolution_set(dev);
+
+	return 0;
+}
+
+static void video_mux(struct em2820 *dev, int index)
+{
+	int input, ainput;
+
+	input = INPUT(index)->vmux;
+	dev->ctl_input = index;
+
+	em2820_i2c_call_clients(dev, DECODER_SET_INPUT, &input);
+
+	dev->ctl_ainput = INPUT(index)->amux;
+
+	switch (dev->ctl_ainput) {
+	case 0:
+		ainput = EM2820_AUDIO_SRC_TUNER;
+		break;
+	default:
+		ainput = EM2820_AUDIO_SRC_LINE;
+	}
+
+	em2820_audio_source(dev, ainput);
+}
+
+/*
+ * em2820_v4l2_do_ioctl()
+ * This function is _not_ called directly, but from
+ * em2820_v4l2_ioctl. Userspace
+ * copying is done already, arg is a kernel pointer.
+ */
+static int em2820_do_ioctl(struct inode *inode, struct file *filp,
+			   struct em2820 *dev, unsigned int cmd, void *arg,
+			   v4l2_kioctl driver_ioctl)
+{
+	int ret;
+
+	switch (cmd) {
+		/* ---------- tv norms ---------- */
+	case VIDIOC_ENUMSTD:
+		{
+			struct v4l2_standard *e = arg;
+			unsigned int i;
+
+			i = e->index;
+			if (i >= TVNORMS)
+				return -EINVAL;
+			ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
+						       tvnorms[e->index].name);
+			e->index = i;
+			if (ret < 0)
+				return ret;
+			return 0;
+		}
+	case VIDIOC_G_STD:
+		{
+			v4l2_std_id *id = arg;
+
+			*id = dev->tvnorm->id;
+			return 0;
+		}
+	case VIDIOC_S_STD:
+		{
+			v4l2_std_id *id = arg;
+			unsigned int i;
+
+			for (i = 0; i < TVNORMS; i++)
+				if (*id == tvnorms[i].id)
+					break;
+			if (i == TVNORMS)
+				for (i = 0; i < TVNORMS; i++)
+					if (*id & tvnorms[i].id)
+						break;
+			if (i == TVNORMS)
+				return -EINVAL;
+
+			down(&dev->lock);
+			dev->tvnorm = &tvnorms[i];
+
+			em2820_set_norm(dev, dev->width, dev->height);
+
+/*
+		dev->width=norm_maxw(dev);
+		dev->height=norm_maxh(dev);
+		dev->frame_size=dev->width*dev->height*2;
+		dev->field_size=dev->frame_size>>1;
+		dev->bytesperline=dev->width*2;
+		dev->hscale=0;
+		dev->vscale=0;
+
+		em2820_resolution_set(dev);
+*/
+/*
+		em2820_uninit_isoc(dev);
+		em2820_set_alternate(dev);
+		em2820_capture_start(dev, 1);
+		em2820_resolution_set(dev);
+		em2820_init_isoc(dev);
+*/
+			em2820_i2c_call_clients(dev, DECODER_SET_NORM,
+						&tvnorms[i].mode);
+			em2820_i2c_call_clients(dev, VIDIOC_S_STD,
+						&dev->tvnorm->id);
+
+			up(&dev->lock);
+
+			return 0;
+		}
+
+		/* ------ input switching ---------- */
+	case VIDIOC_ENUMINPUT:
+		{
+			struct v4l2_input *i = arg;
+			unsigned int n;
+			static const char *iname[] = {
+				[EM2820_VMUX_COMPOSITE1] = "Composite1",
+				[EM2820_VMUX_COMPOSITE2] = "Composite2",
+				[EM2820_VMUX_COMPOSITE3] = "Composite3",
+				[EM2820_VMUX_COMPOSITE4] = "Composite4",
+				[EM2820_VMUX_SVIDEO] = "S-Video",
+				[EM2820_VMUX_TELEVISION] = "Television",
+				[EM2820_VMUX_CABLE] = "Cable TV",
+				[EM2820_VMUX_DVB] = "DVB",
+				[EM2820_VMUX_DEBUG] = "for debug only",
+			};
+
+			n = i->index;
+			if (n >= MAX_EM2820_INPUT)
+				return -EINVAL;
+			if (0 == INPUT(n)->type)
+				return -EINVAL;
+			memset(i, 0, sizeof(*i));
+			i->index = n;
+			i->type = V4L2_INPUT_TYPE_CAMERA;
+			strcpy(i->name, iname[INPUT(n)->type]);
+			if ((EM2820_VMUX_TELEVISION == INPUT(n)->type) ||
+			    (EM2820_VMUX_CABLE == INPUT(n)->type))
+				i->type = V4L2_INPUT_TYPE_TUNER;
+			for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
+				i->std |= tvnorms[n].id;
+			return 0;
+		}
+
+	case VIDIOC_G_INPUT:
+		{
+			int *i = arg;
+			*i = dev->ctl_input;
+
+			return 0;
+		}
+
+	case VIDIOC_S_INPUT:
+		{
+			int *index = arg;
+
+			if (*index >= MAX_EM2820_INPUT)
+				return -EINVAL;
+			if (0 == INPUT(*index)->type)
+				return -EINVAL;
+
+			down(&dev->lock);
+			video_mux(dev, *index);
+			up(&dev->lock);
+
+			return 0;
+		}
+
+	case VIDIOC_G_AUDIO:
+		{
+			struct v4l2_audio *a = arg;
+			unsigned int index = a->index;
+
+			if (a->index > 1)
+				return -EINVAL;
+			memset(a, 0, sizeof(*a));
+			index = dev->ctl_ainput;
+
+			if (index == 0) {
+				strcpy(a->name, "Television");
+			} else {
+				strcpy(a->name, "Line In");
+			}
+			a->capability = V4L2_AUDCAP_STEREO;
+			a->index = index;
+			return 0;
+		}
+
+	case VIDIOC_S_AUDIO:
+		{
+			struct v4l2_audio *a = arg;
+			if (a->index != dev->ctl_ainput)
+				return -EINVAL;
+
+			return 0;
+		}
+
+		/* --- controls ---------------------------------------------- */
+	case VIDIOC_QUERYCTRL:
+		{
+			struct v4l2_queryctrl *qc = arg;
+			u8 i, n;
+			n = sizeof(em2820_qctrl) / sizeof(em2820_qctrl[0]);
+			for (i = 0; i < n; i++)
+				if (qc->id && qc->id == em2820_qctrl[i].id) {
+					memcpy(qc, &(em2820_qctrl[i]),
+					       sizeof(*qc));
+					return 0;
+				}
+
+			return -EINVAL;
+		}
+
+	case VIDIOC_G_CTRL:
+		{
+			struct v4l2_control *ctrl = arg;
+
+
+			return em2820_get_ctrl(dev, ctrl);
+		}
+
+	case VIDIOC_S_CTRL_OLD:	/* ??? */
+	case VIDIOC_S_CTRL:
+		{
+			struct v4l2_control *ctrl = arg;
+			u8 i, n;
+
+
+			n = sizeof(em2820_qctrl) / sizeof(em2820_qctrl[0]);
+			for (i = 0; i < n; i++)
+				if (ctrl->id == em2820_qctrl[i].id) {
+					if (ctrl->value <
+					    em2820_qctrl[i].minimum
+					    || ctrl->value >
+					    em2820_qctrl[i].maximum)
+						return -ERANGE;
+
+					return em2820_set_ctrl(dev, ctrl);
+				}
+			return -EINVAL;
+		}
+
+		/* --- tuner ioctls ------------------------------------------ */
+	case VIDIOC_G_TUNER:
+		{
+			struct v4l2_tuner *t = arg;
+			int status = 0;
+
+			if (0 != t->index)
+				return -EINVAL;
+
+			memset(t, 0, sizeof(*t));
+			strcpy(t->name, "Tuner");
+			t->type = V4L2_TUNER_ANALOG_TV;
+			t->capability = V4L2_TUNER_CAP_NORM;
+			t->rangehigh = 0xffffffffUL;	/* FIXME: set correct range */
+/*		t->signal = 0xffff;*/
+/*		em2820_i2c_call_clients(dev,VIDIOC_G_TUNER,t);*/
+			/* No way to get signal strength? */
+			down(&dev->lock);
+			em2820_i2c_call_clients(dev, DECODER_GET_STATUS,
+						&status);
+			up(&dev->lock);
+			t->signal =
+			    (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
+
+			em2820_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x", t->signal,
+				 t->afc);
+			return 0;
+		}
+	case VIDIOC_S_TUNER:
+		{
+			struct v4l2_tuner *t = arg;
+			int status = 0;
+
+			if (0 != t->index)
+				return -EINVAL;
+			memset(t, 0, sizeof(*t));
+			strcpy(t->name, "Tuner");
+			t->type = V4L2_TUNER_ANALOG_TV;
+			t->capability = V4L2_TUNER_CAP_NORM;
+			t->rangehigh = 0xffffffffUL;	/* FIXME: set correct range */
+/*		t->signal = 0xffff; */
+			/* No way to get signal strength? */
+			down(&dev->lock);
+			em2820_i2c_call_clients(dev, DECODER_GET_STATUS,
+						&status);
+			up(&dev->lock);
+			t->signal =
+			    (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
+
+			em2820_videodbg("VIDIO_S_TUNER: signal=%x, afc=%x\n",
+				 t->signal, t->afc);
+			return 0;
+		}
+	case VIDIOC_G_FREQUENCY:
+		{
+			struct v4l2_frequency *f = arg;
+
+			memset(f, 0, sizeof(*f));
+			f->type = V4L2_TUNER_ANALOG_TV;
+			f->frequency = dev->ctl_freq;
+
+			return 0;
+		}
+	case VIDIOC_S_FREQUENCY:
+		{
+			struct v4l2_frequency *f = arg;
+
+			if (0 != f->tuner)
+				return -EINVAL;
+
+			if (V4L2_TUNER_ANALOG_TV != f->type)
+				return -EINVAL;
+
+			down(&dev->lock);
+			dev->ctl_freq = f->frequency;
+			em2820_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
+			up(&dev->lock);
+			return 0;
+		}
+
+	case VIDIOC_CROPCAP:
+		{
+			struct v4l2_cropcap *cc = arg;
+
+			if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+				return EINVAL;
+			cc->bounds.left = 0;
+			cc->bounds.top = 0;
+			cc->bounds.width = dev->width;
+			cc->bounds.height = dev->height;
+			cc->defrect = cc->bounds;
+			cc->pixelaspect.numerator = 54;	/* 4:3 FIXME: remove magic numbers */
+			cc->pixelaspect.denominator = 59;
+			return 0;
+		}
+	case VIDIOC_STREAMON:
+		{
+			int *type = arg;
+
+			if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
+			    || dev->io != IO_MMAP)
+				return -EINVAL;
+
+			if (list_empty(&dev->inqueue))
+				return -EINVAL;
+
+			dev->stream = STREAM_ON;	/* FIXME: Start video capture here? */
+
+			em2820_videodbg("VIDIOC_STREAMON: starting stream");
+
+			return 0;
+		}
+	case VIDIOC_STREAMOFF:
+		{
+			int *type = arg;
+			int ret;
+
+			if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
+			    || dev->io != IO_MMAP)
+				return -EINVAL;
+
+			if (dev->stream == STREAM_ON) {
+				em2820_videodbg ("VIDIOC_STREAMOFF: interrupting stream");
+				if ((ret = em2820_stream_interrupt(dev)))
+					return ret;
+			}
+			em2820_empty_framequeues(dev);
+
+			return 0;
+		}
+	default:
+		return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
+						  driver_ioctl);
+	}
+	return 0;
+}
+
+/*
+ * em2820_v4l2_do_ioctl()
+ * This function is _not_ called directly, but from
+ * em2820_v4l2_ioctl. Userspace
+ * copying is done already, arg is a kernel pointer.
+ */
+static int em2820_video_do_ioctl(struct inode *inode, struct file *filp,
+				 unsigned int cmd, void *arg)
+{
+	struct em2820 *dev = filp->private_data;
+
+	if (!dev)
+		return -ENODEV;
+
+	if (video_debug > 1)
+		em2820_print_ioctl(dev->name,cmd);
+
+	switch (cmd) {
+
+		/* --- capabilities ------------------------------------------ */
+	case VIDIOC_QUERYCAP:
+		{
+			struct v4l2_capability *cap = arg;
+
+			memset(cap, 0, sizeof(*cap));
+			strlcpy(cap->driver, "em2820", sizeof(cap->driver));
+			strlcpy(cap->card, em2820_boards[dev->model].name,
+				sizeof(cap->card));
+			strlcpy(cap->bus_info, dev->udev->dev.bus_id,
+				sizeof(cap->bus_info));
+			cap->version = EM2820_VERSION_CODE;
+			cap->capabilities =
+			    V4L2_CAP_VIDEO_CAPTURE |
+			    V4L2_CAP_AUDIO |
+			    V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
+			if (dev->has_tuner)
+				cap->capabilities |= V4L2_CAP_TUNER;
+			return 0;
+		}
+
+		/* --- capture ioctls ---------------------------------------- */
+	case VIDIOC_ENUM_FMT:
+		{
+			struct v4l2_fmtdesc *fmtd = arg;
+
+			if (fmtd->index != 0)
+				return -EINVAL;
+			memset(fmtd, 0, sizeof(*fmtd));
+			fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+			strcpy(fmtd->description, "Packed YUY2");
+			fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
+			memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
+			return 0;
+		}
+
+	case VIDIOC_G_FMT:
+		{
+			struct v4l2_format *format = arg;
+
+			em2820_videodbg("VIDIOC_G_FMT: type=%s",
+				 format->type ==
+				 V4L2_BUF_TYPE_VIDEO_CAPTURE ?
+				 "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
+				 V4L2_BUF_TYPE_VBI_CAPTURE ?
+				 "V4L2_BUF_TYPE_VBI_CAPTURE " :
+				 "not supported");
+
+			if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+				return -EINVAL;
+
+			format->fmt.pix.width = dev->width;
+			format->fmt.pix.height = dev->height;
+			format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
+			format->fmt.pix.bytesperline = dev->bytesperline;
+			format->fmt.pix.sizeimage = dev->frame_size;
+			format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+			format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;	/* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
+
+			em2820_videodbg("VIDIOC_G_FMT: %dx%d", dev->width,
+				 dev->height);
+			return 0;
+		}
+
+	case VIDIOC_TRY_FMT:
+	case VIDIOC_S_FMT:
+		{
+			struct v4l2_format *format = arg;
+			u32 i;
+			int ret = 0;
+			int width = format->fmt.pix.width;
+			int height = format->fmt.pix.height;
+			unsigned int hscale, vscale;
+			unsigned int maxh, maxw;
+
+			maxw = norm_maxw(dev);
+			maxh = norm_maxh(dev);
+
+/*		int both_fields; */
+
+			em2820_videodbg("%s: type=%s",
+				 cmd ==
+				 VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
+				 "VIDIOC_S_FMT",
+				 format->type ==
+				 V4L2_BUF_TYPE_VIDEO_CAPTURE ?
+				 "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
+				 V4L2_BUF_TYPE_VBI_CAPTURE ?
+				 "V4L2_BUF_TYPE_VBI_CAPTURE " :
+				 "not supported");
+
+			if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+				return -EINVAL;
+
+			em2820_videodbg("%s: requested %dx%d",
+				 cmd ==
+				 VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
+				 "VIDIOC_S_FMT", format->fmt.pix.width,
+				 format->fmt.pix.height);
+
+			/* FIXME: Move some code away from here */
+			/* width must even because of the YUYV format */
+			/* height must be even because of interlacing */
+			height &= 0xfffe;
+			width &= 0xfffe;
+
+			if (height < 32)
+				height = 32;
+			if (height > maxh)
+				height = maxh;
+			if (width < 48)
+				width = 48;
+			if (width > maxw)
+				width = maxw;
+
+			if ((hscale =
+			     (((unsigned long)maxw) << 12) / width - 4096L) >=
+			    0x4000)
+				hscale = 0x3fff;
+			width =
+			    (((unsigned long)maxw) << 12) / (hscale + 4096L);
+
+			if ((vscale =
+			     (((unsigned long)maxh) << 12) / height - 4096L) >=
+			    0x4000)
+				vscale = 0x3fff;
+			height =
+			    (((unsigned long)maxh) << 12) / (vscale + 4096L);
+
+			format->fmt.pix.width = width;
+			format->fmt.pix.height = height;
+			format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
+			format->fmt.pix.bytesperline = width * 2;
+			format->fmt.pix.sizeimage = width * 2 * height;
+			format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+			format->fmt.pix.field = V4L2_FIELD_INTERLACED;
+
+			em2820_videodbg("%s: returned %dx%d (%d, %d)",
+				 cmd ==
+				 VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
+				 "VIDIOC_S_FMT", format->fmt.pix.width,
+				 format->fmt.pix.height, hscale, vscale);
+
+			if (cmd == VIDIOC_TRY_FMT)
+				return 0;
+
+			for (i = 0; i < dev->num_frames; i++)
+				if (dev->frame[i].vma_use_count) {
+					em2820_videodbg("VIDIOC_S_FMT failed. "
+						"Unmap the buffers first.");
+					return -EINVAL;
+				}
+
+			/* stop io in case it is already in progress */
+			if (dev->stream == STREAM_ON) {
+				em2820_videodbg("VIDIOC_SET_FMT: interupting stream");
+				if ((ret = em2820_stream_interrupt(dev)))
+					return ret;
+			}
+
+			em2820_release_buffers(dev);
+			dev->io = IO_NONE;
+
+			/* set new image size */
+			dev->width = width;
+			dev->height = height;
+			dev->frame_size = dev->width * dev->height * 2;
+			dev->field_size = dev->frame_size >> 1;	/*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
+			dev->bytesperline = dev->width * 2;
+			dev->hscale = hscale;
+			dev->vscale = vscale;
+/*			dev->both_fileds = both_fileds; */
+			em2820_uninit_isoc(dev);
+			em2820_set_alternate(dev);
+			em2820_capture_start(dev, 1);
+			em2820_resolution_set(dev);
+			em2820_init_isoc(dev);
+
+			return 0;
+		}
+
+		/* --- streaming capture ------------------------------------- */
+	case VIDIOC_REQBUFS:
+		{
+			struct v4l2_requestbuffers *rb = arg;
+			u32 i;
+			int ret;
+
+			if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+			    rb->memory != V4L2_MEMORY_MMAP)
+				return -EINVAL;
+
+			if (dev->io == IO_READ) {
+				em2820_videodbg ("method is set to read;"
+					" close and open the device again to"
+					" choose the mmap I/O method");
+				return -EINVAL;
+			}
+
+			for (i = 0; i < dev->num_frames; i++)
+				if (dev->frame[i].vma_use_count) {
+					em2820_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped");
+					return -EINVAL;
+				}
+
+			if (dev->stream == STREAM_ON) {
+				em2820_videodbg("VIDIOC_REQBUFS: interrupting stream");
+				if ((ret = em2820_stream_interrupt(dev)))
+					return ret;
+			}
+
+			em2820_empty_framequeues(dev);
+
+			em2820_release_buffers(dev);
+			if (rb->count)
+				rb->count =
+				    em2820_request_buffers(dev, rb->count);
+
+			dev->frame_current = NULL;
+
+			em2820_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i",
+						     rb->count);
+			dev->io = rb->count ? IO_MMAP : IO_NONE;
+			return 0;
+		}
+
+	case VIDIOC_QUERYBUF:
+		{
+			struct v4l2_buffer *b = arg;
+
+			if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+			    b->index >= dev->num_frames || dev->io != IO_MMAP)
+				return -EINVAL;
+
+			memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
+
+			if (dev->frame[b->index].vma_use_count) {
+				b->flags |= V4L2_BUF_FLAG_MAPPED;
+			}
+			if (dev->frame[b->index].state == F_DONE)
+				b->flags |= V4L2_BUF_FLAG_DONE;
+			else if (dev->frame[b->index].state != F_UNUSED)
+				b->flags |= V4L2_BUF_FLAG_QUEUED;
+			return 0;
+		}
+	case VIDIOC_QBUF:
+		{
+			struct v4l2_buffer *b = arg;
+			unsigned long lock_flags;
+
+			if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+			    b->index >= dev->num_frames || dev->io != IO_MMAP) {
+				return -EINVAL;
+			}
+
+			if (dev->frame[b->index].state != F_UNUSED) {
+				return -EAGAIN;
+			}
+			dev->frame[b->index].state = F_QUEUED;
+
+			/* add frame to fifo */
+			spin_lock_irqsave(&dev->queue_lock, lock_flags);
+			list_add_tail(&dev->frame[b->index].frame,
+				      &dev->inqueue);
+			spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
+
+			return 0;
+		}
+	case VIDIOC_DQBUF:
+		{
+			struct v4l2_buffer *b = arg;
+			struct em2820_frame_t *f;
+			unsigned long lock_flags;
+			int ret = 0;
+
+			if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
+			    || dev->io != IO_MMAP)
+				return -EINVAL;
+
+			if (list_empty(&dev->outqueue)) {
+				if (dev->stream == STREAM_OFF)
+					return -EINVAL;
+				if (filp->f_flags & O_NONBLOCK)
+					return -EAGAIN;
+				ret = wait_event_interruptible
+				    (dev->wait_frame,
+				     (!list_empty(&dev->outqueue)) ||
+				     (dev->state & DEV_DISCONNECTED));
+				if (ret)
+					return ret;
+				if (dev->state & DEV_DISCONNECTED)
+					return -ENODEV;
+			}
+
+			spin_lock_irqsave(&dev->queue_lock, lock_flags);
+			f = list_entry(dev->outqueue.next,
+				       struct em2820_frame_t, frame);
+			list_del(dev->outqueue.next);
+			spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
+
+			f->state = F_UNUSED;
+			memcpy(b, &f->buf, sizeof(*b));
+
+			if (f->vma_use_count)
+				b->flags |= V4L2_BUF_FLAG_MAPPED;
+
+			return 0;
+		}
+	default:
+		return em2820_do_ioctl(inode, filp, dev, cmd, arg,
+				       em2820_video_do_ioctl);
+	}
+	return 0;
+}
+
+/*
+ * em2820_v4l2_ioctl()
+ * handle v4l2 ioctl the main action happens in em2820_v4l2_do_ioctl()
+ */
+static int em2820_v4l2_ioctl(struct inode *inode, struct file *filp,
+			     unsigned int cmd, unsigned long arg)
+{
+	struct em2820 *dev = video_get_drvdata(video_devdata(filp));
+	int ret = 0;
+
+	if (down_interruptible(&dev->fileop_lock))
+		return -ERESTARTSYS;
+
+	if (dev->state & DEV_DISCONNECTED) {
+		em2820_errdev("v4l2 ioctl: device not present\n");
+		up(&dev->fileop_lock);
+		return -ENODEV;
+	}
+
+	if (dev->state & DEV_MISCONFIGURED) {
+		em2820_errdev
+		    ("v4l2 ioctl: device is misconfigured; close and open it again\n");
+		up(&dev->fileop_lock);
+		return -EIO;
+	}
+
+	ret = video_usercopy(inode, filp, cmd, arg, em2820_video_do_ioctl);
+
+	up(&dev->fileop_lock);
+
+	return ret;
+}
+
+static struct file_operations em2820_v4l_fops = {
+	.owner = THIS_MODULE,
+	.open = em2820_v4l2_open,
+	.release = em2820_v4l2_close,
+	.ioctl = em2820_v4l2_ioctl,
+	.read = em2820_v4l2_read,
+	.poll = em2820_v4l2_poll,
+	.mmap = em2820_v4l2_mmap,
+	.llseek = no_llseek,
+};
+
+/******************************** usb interface *****************************************/
+
+/*
+ * em2820_init_dev()
+ * allocates and inits the device structs, registers i2c bus and v4l device
+ */
+static int em2820_init_dev(struct em2820 **devhandle, struct usb_device *udev,
+			   int minor, int model)
+{
+	struct em2820 *dev;
+	int retval = -ENOMEM;
+	int errCode, i;
+	unsigned int maxh, maxw;
+	struct usb_interface *uif;
+
+	/* allocate memory for our device state and initialize it */
+	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+	if (dev == NULL) {
+		em2820_err(DRIVER_NAME ": out of memory!\n");
+		return -ENOMEM;
+	}
+	memset(dev, 0x00, sizeof(*dev));
+
+	snprintf(dev->name, 29, "em2820 #%d", minor);
+	dev->udev = udev;
+	dev->model = model;
+	init_MUTEX(&dev->lock);
+	init_waitqueue_head(&dev->open);
+
+	dev->em2820_write_regs = em2820_write_regs;
+	dev->em2820_read_reg = em2820_read_reg;
+	dev->em2820_read_reg_req_len = em2820_read_reg_req_len;
+	dev->em2820_write_regs_req = em2820_write_regs_req;
+	dev->em2820_read_reg_req = em2820_read_reg_req;
+	dev->has_tuner = em2820_boards[model].has_tuner;
+	dev->has_msp34xx = em2820_boards[model].has_msp34xx;
+	dev->tda9887_conf = em2820_boards[model].tda9887_conf;
+	dev->decoder = em2820_boards[model].decoder;
+
+	if (tuner >= 0)
+		dev->tuner_type = tuner;
+	else
+		dev->tuner_type = em2820_boards[model].tuner_type;
+
+	dev->video_inputs = em2820_boards[model].vchannels;
+
+	for (i = 0; i < TVNORMS; i++)
+		if (em2820_boards[model].norm == tvnorms[i].mode)
+			break;
+	if (i == TVNORMS)
+		i = 0;
+
+	dev->tvnorm = &tvnorms[i];	/* set default norm */
+
+	em2820_videodbg("tvnorm=%s\n", dev->tvnorm->name);
+
+	maxw = norm_maxw(dev);
+	maxh = norm_maxh(dev);
+
+	/* set default image size */
+	dev->width = maxw;
+	dev->height = maxh;
+	dev->interlaced = EM2820_INTERLACED_DEFAULT;
+	dev->field_size = dev->width * dev->height;
+	dev->frame_size =
+	    dev->interlaced ? dev->field_size << 1 : dev->field_size;
+	dev->bytesperline = dev->width * 2;
+	dev->hscale = 0;
+	dev->vscale = 0;
+	dev->ctl_input = 2;
+
+	/* setup video picture settings for saa7113h */
+	memset(&dev->vpic, 0, sizeof(dev->vpic));
+	dev->vpic.colour = 128 << 8;
+	dev->vpic.hue = 128 << 8;
+	dev->vpic.brightness = 128 << 8;
+	dev->vpic.contrast = 192 << 8;
+	dev->vpic.whiteness = 128 << 8;	/* This one isn't used */
+	dev->vpic.depth = 16;
+	dev->vpic.palette = VIDEO_PALETTE_YUV422;
+
+	/* compute alternate max packet sizes */
+	uif = dev->udev->actconfig->interface[0];
+	dev->alt_max_pkt_size[0] = 0;
+	for (i = 1; i <= EM2820_MAX_ALT; i++) {
+		u16 tmp =
+		    le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
+				wMaxPacketSize);
+		dev->alt_max_pkt_size[i] =
+		    (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
+	}
+
+#ifdef CONFIG_MODULES
+	/* request some modules */
+	if (dev->decoder == EM2820_SAA7113)
+		request_module("saa7113");
+	if (dev->decoder == EM2820_SAA7114)
+		request_module("saa7114");
+	if (dev->decoder == EM2820_TVP5150)
+		request_module("tvp5150");
+	if (dev->has_tuner)
+		request_module("tuner");
+	if (dev->tda9887_conf)
+		request_module("tda9887");
+#endif
+	errCode = em2820_config(dev);
+	if (errCode) {
+		em2820_errdev("error configuring device\n");
+		kfree(dev);
+		return -ENOMEM;
+	}
+
+	down(&dev->lock);
+	/* register i2c bus */
+	em2820_i2c_register(dev);
+
+	/* Do board specific init and eeprom reading */
+	em2820_card_setup(dev);
+
+	/* configure the device */
+	em2820_config_i2c(dev);
+
+	up(&dev->lock);
+
+	errCode = em2820_config(dev);
+
+#ifdef CONFIG_MODULES
+	if (dev->has_msp34xx)
+		request_module("msp3400");
+#endif
+	/* allocate and fill v4l2 device struct */
+	dev->vdev = video_device_alloc();
+	if (NULL == dev->vdev) {
+		em2820_errdev("cannot allocate video_device.\n");
+		kfree(dev);
+		return -ENOMEM;
+	}
+
+	dev->vdev->owner = THIS_MODULE;
+	dev->vdev->type = VID_TYPE_CAPTURE;
+	if (dev->has_tuner)
+		dev->vdev->type |= VID_TYPE_TUNER;
+	dev->vdev->hardware = 0;
+	dev->vdev->fops = &em2820_v4l_fops;
+	dev->vdev->minor = -1;
+	dev->vdev->dev = &dev->udev->dev;
+	dev->vdev->release = video_device_release;
+	snprintf(dev->vdev->name, sizeof(dev->vdev->name), "%s",
+		 "em2820 video");
+	video_set_drvdata(dev->vdev, dev);
+
+	/* register v4l2 device */
+	down(&dev->lock);
+	if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER, -1))) {
+		em2820_errdev("unable to register video device (error=%i).\n",
+			      retval);
+		up(&dev->lock);
+		video_set_drvdata(dev->vdev, NULL);
+		video_device_release(dev->vdev);
+		kfree(dev);
+		return -ENODEV;
+	}
+	if (dev->has_msp34xx) {
+		/* Send a reset to other chips via gpio */
+		em2820_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
+		udelay(2500);
+		em2820_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
+		udelay(2500);
+
+	}
+	video_mux(dev, 0);
+
+	up(&dev->lock);
+
+	em2820_info("V4L2 device registered as /dev/video%d\n",
+		    dev->vdev->minor);
+
+	*devhandle = dev;
+	return 0;
+}
+
+/*
+ * em2820_usb_probe()
+ * checks for supported devices
+ */
+static int em2820_usb_probe(struct usb_interface *interface,
+			    const struct usb_device_id *id)
+{
+	const struct usb_endpoint_descriptor *endpoint;
+	struct usb_device *udev;
+	struct em2820 *dev = NULL;
+	int retval = -ENODEV;
+
+	udev = usb_get_dev(interface_to_usbdev(interface));
+	endpoint = &interface->cur_altsetting->endpoint[1].desc;
+
+	/* check if the the device has the iso in endpoint at the correct place */
+	if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
+	    USB_ENDPOINT_XFER_ISOC) {
+/*		em2820_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n"); */
+		return -ENODEV;
+	}
+	if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
+/*		em2820_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n"); */
+		return -ENODEV;
+	}
+
+	/* allocate device struct */
+	retval = em2820_init_dev(&dev, udev, interface->minor, id->driver_info);
+	if (retval)
+		return retval;
+
+	em2820_info("Found %s\n", em2820_boards[id->driver_info].name);
+
+	/* save our data pointer in this interface device */
+	usb_set_intfdata(interface, dev);
+	return 0;
+}
+
+/*
+ * em2820_usb_disconnect()
+ * called when the device gets diconencted
+ * video device will be unregistered on v4l2_close in case it is still open
+ */
+static void em2820_usb_disconnect(struct usb_interface *interface)
+{
+	struct em2820 *dev = usb_get_intfdata(interface);
+	usb_set_intfdata(interface, NULL);
+
+	if (!dev)
+		return;
+
+	down_write(&em2820_disconnect);
+
+	down(&dev->lock);
+
+	em2820_info("disconnecting %s\n", dev->vdev->name);
+
+	wake_up_interruptible_all(&dev->open);
+
+	if (dev->users) {
+		em2820_warn
+		    ("device /dev/video%d is open! Deregistration and memory "
+		     "deallocation are deferred on close.\n", dev->vdev->minor);
+		dev->state |= DEV_MISCONFIGURED;
+		em2820_uninit_isoc(dev);
+		dev->state |= DEV_DISCONNECTED;
+		wake_up_interruptible(&dev->wait_frame);
+		wake_up_interruptible(&dev->wait_stream);
+	} else {
+		dev->state |= DEV_DISCONNECTED;
+		em2820_release_resources(dev);
+	}
+
+	up(&dev->lock);
+
+	if (!dev->users)
+		kfree(dev);
+
+	up_write(&em2820_disconnect);
+
+}
+
+static struct usb_driver em2820_usb_driver = {
+	.owner = THIS_MODULE,
+	.name = "em2820",
+	.probe = em2820_usb_probe,
+	.disconnect = em2820_usb_disconnect,
+	.id_table = em2820_id_table,
+};
+
+static int __init em2820_module_init(void)
+{
+	int result;
+
+	printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
+	       (EM2820_VERSION_CODE >> 16) & 0xff,
+	       (EM2820_VERSION_CODE >> 8) & 0xff, EM2820_VERSION_CODE & 0xff);
+#ifdef SNAPSHOT
+	printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
+	       SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
+#endif
+
+	/* register this driver with the USB subsystem */
+	result = usb_register(&em2820_usb_driver);
+	if (result)
+		em2820_err(DRIVER_NAME
+			   " usb_register failed. Error number %d.\n", result);
+
+	return result;
+}
+
+static void __exit em2820_module_exit(void)
+{
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&em2820_usb_driver);
+}
+
+module_init(em2820_module_init);
+module_exit(em2820_module_exit);