V4L/DVB (7019): V4L: add support for Syntek DC1125 webcams

This driver supports cameras with USB ID 174f:a311 or 05e1:0501,
and the ov965x sensors. These devices are found in some Asus laptops
and probably somewhere else.

It is based on the stk11xx driver written by Nicolas Vivien

Signed-off-by: Jaime Velasco Juan <jsagarribay@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 1465 insertions, 0 deletions

diff --git a/drivers/media/video/stk-webcam.c b/drivers/media/video/stk-webcam.c
new file mode 100644
index 000000000000..f300eca3c473
--- /dev/null
+++ b/drivers/media/video/stk-webcam.c
@@ -0,0 +1,1465 @@
+/*
+ * stk-webcam.c : Driver for Syntek 1125 USB webcam controller
+ *
+ * Copyright (C) 2006 Nicolas VIVIEN
+ * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
+ *
+ * Some parts are inspired from cafe_ccic.c
+ * Copyright 2006-2007 Jonathan Corbet
+ *
+ * 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
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/kref.h>
+
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-common.h>
+#include <linux/vmalloc.h>
+
+#include "stk-webcam.h"
+
+
+static int hflip = 1;
+module_param(hflip, bool, 0444);
+MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 1");
+
+static int vflip = 1;
+module_param(vflip, bool, 0444);
+MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 1");
+
+static int debug;
+module_param(debug, int, 0444);
+MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
+MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
+
+
+
+/* Some cameras have audio interfaces, we aren't interested in those */
+static struct usb_device_id stkwebcam_table[] = {
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
+	{ }
+};
+MODULE_DEVICE_TABLE(usb, stkwebcam_table);
+
+void stk_camera_cleanup(struct kref *kref)
+{
+	struct stk_camera *dev = to_stk_camera(kref);
+
+	STK_INFO("Syntek USB2.0 Camera release resources"
+		" video device /dev/video%d\n", dev->vdev.minor);
+	video_unregister_device(&dev->vdev);
+	dev->vdev.priv = NULL;
+
+	if (dev->sio_bufs != NULL || dev->isobufs != NULL)
+		STK_ERROR("We are leaking memory\n");
+	usb_put_intf(dev->interface);
+	kfree(dev);
+}
+
+
+/*
+ * Basic stuff
+ */
+int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
+{
+	struct usb_device *udev = dev->udev;
+	int ret;
+
+	ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+			0x01,
+			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			value,
+			index,
+			NULL,
+			0,
+			500);
+	if (ret < 0)
+		return ret;
+	else
+		return 0;
+}
+
+int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
+{
+	struct usb_device *udev = dev->udev;
+	int ret;
+
+	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
+			0x00,
+			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			0x00,
+			index,
+			(u8 *) value,
+			sizeof(u8),
+			500);
+	if (ret < 0)
+		return ret;
+	else
+		return 0;
+}
+
+static int stk_start_stream(struct stk_camera *dev)
+{
+	int value;
+	int i, ret;
+	int value_116, value_117;
+
+	if (!is_present(dev))
+		return -ENODEV;
+	if (!is_memallocd(dev) || !is_initialised(dev)) {
+		STK_ERROR("FIXME: Buffers are not allocated\n");
+		return -EFAULT;
+	}
+	ret = usb_set_interface(dev->udev, 0, 5);
+
+	if (ret < 0)
+		STK_ERROR("usb_set_interface failed !\n");
+	if (stk_sensor_wakeup(dev))
+		STK_ERROR("error awaking the sensor\n");
+
+	stk_camera_read_reg(dev, 0x0116, &value_116);
+	stk_camera_read_reg(dev, 0x0117, &value_117);
+
+	stk_camera_write_reg(dev, 0x0116, 0x0000);
+	stk_camera_write_reg(dev, 0x0117, 0x0000);
+
+	stk_camera_read_reg(dev, 0x0100, &value);
+	stk_camera_write_reg(dev, 0x0100, value | 0x80);
+
+	stk_camera_write_reg(dev, 0x0116, value_116);
+	stk_camera_write_reg(dev, 0x0117, value_117);
+	for (i = 0; i < MAX_ISO_BUFS; i++) {
+		if (dev->isobufs[i].urb) {
+			ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
+			atomic_inc(&dev->urbs_used);
+			if (ret)
+				return ret;
+		}
+	}
+	set_streaming(dev);
+	return 0;
+}
+
+static int stk_stop_stream(struct stk_camera *dev)
+{
+	int value;
+	int i;
+	if (is_present(dev)) {
+		stk_camera_read_reg(dev, 0x0100, &value);
+		stk_camera_write_reg(dev, 0x0100, value & ~0x80);
+		if (dev->isobufs != NULL) {
+			for (i = 0; i < MAX_ISO_BUFS; i++) {
+				if (dev->isobufs[i].urb)
+					usb_kill_urb(dev->isobufs[i].urb);
+			}
+		}
+		unset_streaming(dev);
+
+		if (usb_set_interface(dev->udev, 0, 0))
+			STK_ERROR("usb_set_interface failed !\n");
+		if (stk_sensor_sleep(dev))
+			STK_ERROR("error suspending the sensor\n");
+	}
+	return 0;
+}
+
+/*
+ * This seems to be the shortest init sequence we
+ * must do in order to find the sensor
+ * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
+ * is also reset. Maybe powers down it?
+ * Rest of values don't make a difference
+ */
+
+static struct regval stk1125_initvals[] = {
+	/*TODO: What means this sequence? */
+	{0x0000, 0x24},
+	{0x0100, 0x21},
+	{0x0002, 0x68},
+	{0x0003, 0x80},
+	{0x0005, 0x00},
+	{0x0007, 0x03},
+	{0x000d, 0x00},
+	{0x000f, 0x02},
+	{0x0300, 0x12},
+	{0x0350, 0x41},
+	{0x0351, 0x00},
+	{0x0352, 0x00},
+	{0x0353, 0x00},
+	{0x0018, 0x10},
+	{0x0019, 0x00},
+	{0x001b, 0x0e},
+	{0x001c, 0x46},
+	{0x0300, 0x80},
+	{0x001a, 0x04},
+	{0x0110, 0x00},
+	{0x0111, 0x00},
+	{0x0112, 0x00},
+	{0x0113, 0x00},
+
+	{0xffff, 0xff},
+};
+
+
+static int stk_initialise(struct stk_camera *dev)
+{
+	struct regval *rv;
+	int ret;
+	if (!is_present(dev))
+		return -ENODEV;
+	if (is_initialised(dev))
+		return 0;
+	rv = stk1125_initvals;
+	while (rv->reg != 0xffff) {
+		ret = stk_camera_write_reg(dev, rv->reg, rv->val);
+		if (ret)
+			return ret;
+		rv++;
+	}
+	if (stk_sensor_init(dev) == 0) {
+		set_initialised(dev);
+		return 0;
+	} else
+		return -1;
+}
+
+/* sysfs functions */
+/*FIXME cleanup this */
+
+static ssize_t show_brightness(struct device *class,
+			struct device_attribute *attr, char *buf)
+{
+	struct video_device *vdev = to_video_device(class);
+	struct stk_camera *dev = vdev_to_camera(vdev);
+
+	return sprintf(buf, "%X\n", dev->vsettings.brightness);
+}
+
+static ssize_t store_brightness(struct device *class,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	char *endp;
+	unsigned long value;
+	int ret;
+
+	struct video_device *vdev = to_video_device(class);
+	struct stk_camera *dev = vdev_to_camera(vdev);
+
+	value = simple_strtoul(buf, &endp, 16);
+
+	dev->vsettings.brightness = (int) value;
+
+	ret = stk_sensor_set_brightness(dev, value >> 8);
+	if (ret)
+		return ret;
+	else
+		return count;
+}
+
+static ssize_t show_hflip(struct device *class,
+		struct device_attribute *attr, char *buf)
+{
+	struct video_device *vdev = to_video_device(class);
+	struct stk_camera *dev = vdev_to_camera(vdev);
+
+	return sprintf(buf, "%d\n", dev->vsettings.hflip);
+}
+
+static ssize_t store_hflip(struct device *class,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct video_device *vdev = to_video_device(class);
+	struct stk_camera *dev = vdev_to_camera(vdev);
+
+	if (strncmp(buf, "1", 1) == 0)
+		dev->vsettings.hflip = 1;
+	else if (strncmp(buf, "0", 1) == 0)
+		dev->vsettings.hflip = 0;
+	else
+		return -EINVAL;
+
+	return strlen(buf);
+}
+
+static ssize_t show_vflip(struct device *class,
+		struct device_attribute *attr, char *buf)
+{
+	struct video_device *vdev = to_video_device(class);
+	struct stk_camera *dev = vdev_to_camera(vdev);
+
+	return sprintf(buf, "%d\n", dev->vsettings.vflip);
+}
+
+static ssize_t store_vflip(struct device *class,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct video_device *vdev = to_video_device(class);
+	struct stk_camera *dev = vdev_to_camera(vdev);
+
+	if (strncmp(buf, "1", 1) == 0)
+		dev->vsettings.vflip = 1;
+	else if (strncmp(buf, "0", 1) == 0)
+		dev->vsettings.vflip = 0;
+	else
+		return -EINVAL;
+
+	return strlen(buf);
+}
+
+static DEVICE_ATTR(brightness, S_IRUGO | S_IWUGO,
+			show_brightness, store_brightness);
+static DEVICE_ATTR(hflip, S_IRUGO | S_IWUGO, show_hflip, store_hflip);
+static DEVICE_ATTR(vflip, S_IRUGO | S_IWUGO, show_vflip, store_vflip);
+
+static int stk_create_sysfs_files(struct video_device *vdev)
+{
+	int ret;
+
+	ret = video_device_create_file(vdev, &dev_attr_brightness);
+	ret += video_device_create_file(vdev, &dev_attr_hflip);
+	ret += video_device_create_file(vdev, &dev_attr_vflip);
+	return ret;
+}
+
+static void stk_remove_sysfs_files(struct video_device *vdev)
+{
+	video_device_remove_file(vdev, &dev_attr_brightness);
+	video_device_remove_file(vdev, &dev_attr_hflip);
+	video_device_remove_file(vdev, &dev_attr_vflip);
+}
+
+
+/* *********************************************** */
+/*
+ * This function is called as an URB transfert is complete (Isochronous pipe).
+ * So, the traitement is done in interrupt time, so it has be fast, not crash,
+ * and not stall. Neat.
+ */
+static void stk_isoc_handler(struct urb *urb)
+{
+	int i;
+	int ret;
+	int framelen;
+	unsigned long flags;
+
+	unsigned char *fill = NULL;
+	unsigned char *iso_buf = NULL;
+
+	struct stk_camera *dev;
+	struct stk_sio_buffer *fb;
+
+	dev = (struct stk_camera *) urb->context;
+
+	if (dev == NULL) {
+		STK_ERROR("isoc_handler called with NULL device !\n");
+		return;
+	}
+
+	if (urb->status == -ENOENT || urb->status == -ECONNRESET
+		|| urb->status == -ESHUTDOWN) {
+		atomic_dec(&dev->urbs_used);
+		return;
+	}
+
+	spin_lock_irqsave(&dev->spinlock, flags);
+
+	if (urb->status != -EINPROGRESS && urb->status != 0) {
+		STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
+		goto resubmit;
+	}
+
+	if (list_empty(&dev->sio_avail)) {
+		/*FIXME Stop streaming after a while */
+		(void) (printk_ratelimit() &&
+		STK_ERROR("isoc_handler without available buffer!\n"));
+		goto resubmit;
+	}
+	fb = list_first_entry(&dev->sio_avail,
+			struct stk_sio_buffer, list);
+	fill = fb->buffer + fb->v4lbuf.bytesused;
+
+	for (i = 0; i < urb->number_of_packets; i++) {
+		if (urb->iso_frame_desc[i].status != 0) {
+			if (urb->iso_frame_desc[i].status != -EXDEV)
+				STK_ERROR("Frame %d has error %d\n", i,
+					urb->iso_frame_desc[i].status);
+			continue;
+		}
+		framelen = urb->iso_frame_desc[i].actual_length;
+		iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+
+		if (framelen <= 4)
+			continue; /* no data */
+
+		/*
+		 * we found something informational from there
+		 * the isoc frames have to type of headers
+		 * type1: 00 xx 00 00 or 20 xx 00 00
+		 * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
+		 * xx is a sequencer which has never been seen over 0x3f
+		 * imho data written down looks like bayer, i see similarities
+		 * after every 640 bytes
+		 */
+		if (*iso_buf & 0x80) {
+			framelen -= 8;
+			iso_buf += 8;
+			/* This marks a new frame */
+			if (fb->v4lbuf.bytesused != 0
+				&& fb->v4lbuf.bytesused != dev->frame_size) {
+				(void) (printk_ratelimit() &&
+				STK_ERROR("frame %d, "
+					"bytesused=%d, skipping\n",
+					i, fb->v4lbuf.bytesused));
+				fb->v4lbuf.bytesused = 0;
+				fill = fb->buffer;
+			} else if (fb->v4lbuf.bytesused == dev->frame_size) {
+				list_move_tail(dev->sio_avail.next,
+					&dev->sio_full);
+				wake_up(&dev->wait_frame);
+				if (list_empty(&dev->sio_avail)) {
+					(void) (printk_ratelimit() &&
+					STK_ERROR("No buffer available\n"));
+					goto resubmit;
+				}
+				fb = list_first_entry(&dev->sio_avail,
+					struct stk_sio_buffer, list);
+				fb->v4lbuf.bytesused = 0;
+				fill = fb->buffer;
+			}
+		} else {
+			framelen -= 4;
+			iso_buf += 4;
+		}
+
+		/* Our buffer is full !!! */
+		if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
+			(void) (printk_ratelimit() &&
+			STK_ERROR("Frame buffer overflow, lost sync\n"));
+			/*FIXME Do something here? */
+			continue;
+		}
+		spin_unlock_irqrestore(&dev->spinlock, flags);
+		memcpy(fill, iso_buf, framelen);
+		spin_lock_irqsave(&dev->spinlock, flags);
+		fill += framelen;
+
+		/* New size of our buffer */
+		fb->v4lbuf.bytesused += framelen;
+	}
+
+resubmit:
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+	urb->dev = dev->udev;
+	ret = usb_submit_urb(urb, GFP_ATOMIC);
+	if (ret != 0) {
+		STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
+			ret);
+	}
+}
+
+/* -------------------------------------------- */
+
+static int stk_prepare_iso(struct stk_camera *dev)
+{
+	void *kbuf;
+	int i, j;
+	struct urb *urb;
+	struct usb_device *udev;
+
+	if (dev == NULL)
+		return -ENXIO;
+	udev = dev->udev;
+
+	if (dev->isobufs)
+		STK_ERROR("isobufs already allocated. Bad\n");
+	else
+		dev->isobufs = kzalloc(MAX_ISO_BUFS * sizeof(*dev->isobufs),
+					GFP_KERNEL);
+	if (dev->isobufs == NULL) {
+		STK_ERROR("Unable to allocate iso buffers\n");
+		return -ENOMEM;
+	}
+	for (i = 0; i < MAX_ISO_BUFS; i++) {
+		if (dev->isobufs[i].data == NULL) {
+			kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
+			if (kbuf == NULL) {
+				STK_ERROR("Failed to allocate iso buffer %d\n",
+					i);
+				goto isobufs_out;
+			}
+			dev->isobufs[i].data = kbuf;
+		} else
+			STK_ERROR("isobuf data already allocated\n");
+		if (dev->isobufs[i].urb == NULL) {
+			urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
+			if (urb == NULL) {
+				STK_ERROR("Failed to allocate URB %d\n", i);
+				goto isobufs_out;
+			}
+			dev->isobufs[i].urb = urb;
+		} else {
+			STK_ERROR("Killing URB\n");
+			usb_kill_urb(dev->isobufs[i].urb);
+			urb = dev->isobufs[i].urb;
+		}
+		urb->interval = 1;
+		urb->dev = udev;
+		urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
+		urb->transfer_flags = URB_ISO_ASAP;
+		urb->transfer_buffer = dev->isobufs[i].data;
+		urb->transfer_buffer_length = ISO_BUFFER_SIZE;
+		urb->complete = stk_isoc_handler;
+		urb->context = dev;
+		urb->start_frame = 0;
+		urb->number_of_packets = ISO_FRAMES_PER_DESC;
+
+		for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
+			urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
+			urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
+		}
+	}
+	set_memallocd(dev);
+	return 0;
+
+isobufs_out:
+	for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
+		kfree(dev->isobufs[i].data);
+	for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
+		usb_free_urb(dev->isobufs[i].urb);
+	kfree(dev->isobufs);
+	dev->isobufs = NULL;
+	return -ENOMEM;
+}
+
+static void stk_clean_iso(struct stk_camera *dev)
+{
+	int i;
+
+	if (dev == NULL || dev->isobufs == NULL)
+		return;
+
+	for (i = 0; i < MAX_ISO_BUFS; i++) {
+		struct urb *urb;
+
+		urb = dev->isobufs[i].urb;
+		if (urb) {
+			if (atomic_read(&dev->urbs_used))
+				usb_kill_urb(urb);
+			usb_free_urb(urb);
+		}
+		kfree(dev->isobufs[i].data);
+	}
+	kfree(dev->isobufs);
+	dev->isobufs = NULL;
+	unset_memallocd(dev);
+}
+
+static int stk_setup_siobuf(struct stk_camera *dev, int index)
+{
+	struct stk_sio_buffer *buf = dev->sio_bufs + index;
+	INIT_LIST_HEAD(&buf->list);
+	buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
+	buf->buffer = vmalloc_user(buf->v4lbuf.length);
+	if (buf->buffer == NULL)
+		return -ENOMEM;
+	buf->mapcount = 0;
+	buf->dev = dev;
+	buf->v4lbuf.index = index;
+	buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	buf->v4lbuf.field = V4L2_FIELD_NONE;
+	buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
+	buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
+	return 0;
+}
+
+static int stk_free_sio_buffers(struct stk_camera *dev)
+{
+	int i;
+	int nbufs;
+	unsigned long flags;
+	if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
+		return 0;
+	/*
+	* If any buffers are mapped, we cannot free them at all.
+	*/
+	for (i = 0; i < dev->n_sbufs; i++) {
+		if (dev->sio_bufs[i].mapcount > 0)
+			return -EBUSY;
+	}
+	/*
+	* OK, let's do it.
+	*/
+	spin_lock_irqsave(&dev->spinlock, flags);
+	INIT_LIST_HEAD(&dev->sio_avail);
+	INIT_LIST_HEAD(&dev->sio_full);
+	nbufs = dev->n_sbufs;
+	dev->n_sbufs = 0;
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+	for (i = 0; i < nbufs; i++) {
+		if (dev->sio_bufs[i].buffer != NULL)
+			vfree(dev->sio_bufs[i].buffer);
+	}
+	kfree(dev->sio_bufs);
+	dev->sio_bufs = NULL;
+	return 0;
+}
+
+static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
+{
+	int i;
+	if (dev->sio_bufs != NULL)
+		STK_ERROR("sio_bufs already allocated\n");
+	else {
+		dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
+				GFP_KERNEL);
+		if (dev->sio_bufs == NULL)
+			return -ENOMEM;
+		for (i = 0; i < n_sbufs; i++) {
+			if (stk_setup_siobuf(dev, i))
+				return (dev->n_sbufs > 1)? 0 : -ENOMEM;
+			dev->n_sbufs = i+1;
+		}
+	}
+	return 0;
+}
+
+static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
+{
+	int err;
+	err = stk_prepare_iso(dev);
+	if (err) {
+		stk_clean_iso(dev);
+		return err;
+	}
+	err = stk_prepare_sio_buffers(dev, n_sbufs);
+	if (err) {
+		stk_free_sio_buffers(dev);
+		return err;
+	}
+	return 0;
+}
+
+static void stk_free_buffers(struct stk_camera *dev)
+{
+	stk_clean_iso(dev);
+	stk_free_sio_buffers(dev);
+}
+/* -------------------------------------------- */
+
+/* v4l file operations */
+
+static int v4l_stk_open(struct inode *inode, struct file *fp)
+{
+	struct stk_camera *dev;
+	struct video_device *vdev;
+
+	vdev = video_devdata(fp);
+	dev = vdev_to_camera(vdev);
+
+	if (dev == NULL || !is_present(dev))
+		return -ENXIO;
+	fp->private_data = vdev;
+	kref_get(&dev->kref);
+
+	return 0;
+}
+
+static int v4l_stk_release(struct inode *inode, struct file *fp)
+{
+	struct stk_camera *dev;
+	struct video_device *vdev;
+
+	vdev = video_devdata(fp);
+	if (vdev == NULL) {
+		STK_ERROR("v4l_release called w/o video devdata\n");
+		return -EFAULT;
+	}
+	dev = vdev_to_camera(vdev);
+	if (dev == NULL) {
+		STK_ERROR("v4l_release called on removed device\n");
+		return -ENODEV;
+	}
+
+	if (dev->owner != fp) {
+		kref_put(&dev->kref, stk_camera_cleanup);
+		return 0;
+	}
+
+	stk_stop_stream(dev);
+
+	stk_free_buffers(dev);
+
+	dev->owner = NULL;
+
+	kref_put(&dev->kref, stk_camera_cleanup);
+
+	return 0;
+}
+
+static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
+		size_t count, loff_t *f_pos)
+{
+	int i;
+	int ret;
+	unsigned long flags;
+	struct stk_camera *dev;
+	struct video_device *vdev;
+	struct stk_sio_buffer *sbuf;
+
+	vdev = video_devdata(fp);
+	if (vdev == NULL)
+		return -EFAULT;
+	dev = vdev_to_camera(vdev);
+
+	if (dev == NULL)
+		return -EIO;
+
+	if (!is_present(dev))
+		return -EIO;
+	if (dev->owner && dev->owner != fp)
+		return -EBUSY;
+	dev->owner = fp;
+	if (!is_streaming(dev)) {
+		if (stk_initialise(dev)
+			|| stk_allocate_buffers(dev, 3)
+			|| stk_start_stream(dev))
+			return -ENOMEM;
+		spin_lock_irqsave(&dev->spinlock, flags);
+		for (i = 0; i < dev->n_sbufs; i++) {
+			list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
+			dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
+		}
+		spin_unlock_irqrestore(&dev->spinlock, flags);
+	}
+	if (*f_pos == 0) {
+		if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
+			return -EWOULDBLOCK;
+		ret = wait_event_interruptible(dev->wait_frame,
+			!list_empty(&dev->sio_full) || !is_present(dev));
+		if (ret)
+			return ret;
+		if (!is_present(dev))
+			return -EIO;
+	}
+	if (count + *f_pos > dev->frame_size)
+		count = dev->frame_size - *f_pos;
+	spin_lock_irqsave(&dev->spinlock, flags);
+	if (list_empty(&dev->sio_full)) {
+		spin_unlock_irqrestore(&dev->spinlock, flags);
+		STK_ERROR("BUG: No siobufs ready\n");
+		return 0;
+	}
+	sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+
+	if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
+		return -EFAULT;
+
+	*f_pos += count;
+
+	if (*f_pos >= dev->frame_size) {
+		*f_pos = 0;
+		spin_lock_irqsave(&dev->spinlock, flags);
+		list_move_tail(&sbuf->list, &dev->sio_avail);
+		spin_unlock_irqrestore(&dev->spinlock, flags);
+	}
+	return count;
+}
+
+static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
+{
+	struct stk_camera *dev;
+	struct video_device *vdev;
+
+	vdev = video_devdata(fp);
+
+	if (vdev == NULL)
+		return -EFAULT;
+
+	dev = vdev_to_camera(vdev);
+	if (dev == NULL)
+		return -ENODEV;
+
+	poll_wait(fp, &dev->wait_frame, wait);
+
+	if (!is_present(dev))
+		return POLLERR;
+
+	if (!list_empty(&dev->sio_full))
+		return (POLLIN | POLLRDNORM);
+
+	return 0;
+}
+
+
+static void stk_v4l_vm_open(struct vm_area_struct *vma)
+{
+	struct stk_sio_buffer *sbuf = vma->vm_private_data;
+	sbuf->mapcount++;
+}
+static void stk_v4l_vm_close(struct vm_area_struct *vma)
+{
+	struct stk_sio_buffer *sbuf = vma->vm_private_data;
+	sbuf->mapcount--;
+	if (sbuf->mapcount == 0)
+		sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
+}
+static struct vm_operations_struct stk_v4l_vm_ops = {
+	.open = stk_v4l_vm_open,
+	.close = stk_v4l_vm_close
+};
+
+static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
+{
+	unsigned int i;
+	int ret;
+	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+	struct stk_camera *dev;
+	struct video_device *vdev;
+	struct stk_sio_buffer *sbuf = NULL;
+
+	if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
+		return -EINVAL;
+
+	vdev = video_devdata(fp);
+	dev = vdev_to_camera(vdev);
+
+	for (i = 0; i < dev->n_sbufs; i++) {
+		if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
+			sbuf = dev->sio_bufs + i;
+			break;
+		}
+	}
+	if (sbuf == NULL)
+		return -EINVAL;
+	ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
+	if (ret)
+		return ret;
+	vma->vm_flags |= VM_DONTEXPAND;
+	vma->vm_private_data = sbuf;
+	vma->vm_ops = &stk_v4l_vm_ops;
+	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
+	stk_v4l_vm_open(vma);
+	return 0;
+}
+
+/* v4l ioctl handlers */
+
+static int stk_vidioc_querycap(struct file *filp,
+		void *priv, struct v4l2_capability *cap)
+{
+	strcpy(cap->driver, "stk");
+	strcpy(cap->card, "stk");
+	cap->version = DRIVER_VERSION_NUM;
+
+	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
+		| V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
+	return 0;
+}
+
+static int stk_vidioc_enum_input(struct file *filp,
+		void *priv, struct v4l2_input *input)
+{
+	if (input->index != 0)
+		return -EINVAL;
+
+	strcpy(input->name, "Syntek USB Camera");
+	input->type = V4L2_INPUT_TYPE_CAMERA;
+	return 0;
+}
+
+
+static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
+{
+	*i = 0;
+	return 0;
+}
+
+static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
+{
+	if (i != 0)
+		return -EINVAL;
+	else
+		return 0;
+}
+
+/* from vivi.c */
+static int stk_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
+{
+	return 0;
+}
+
+/* List of all V4Lv2 controls supported by the driver */
+static struct v4l2_queryctrl stk_controls[] = {
+	{
+		.id      = V4L2_CID_BRIGHTNESS,
+		.type    = V4L2_CTRL_TYPE_INTEGER,
+		.name    = "Brightness",
+		.minimum = 0,
+		.maximum = 0xffff,
+		.step    = 0x0100,
+		.default_value = 0x6000,
+	},
+	/*TODO: get more controls to work */
+};
+
+static int stk_vidioc_queryctrl(struct file *filp,
+		void *priv, struct v4l2_queryctrl *c)
+{
+	int i;
+	int nbr;
+	nbr = ARRAY_SIZE(stk_controls);
+
+	for (i = 0; i < nbr; i++) {
+		if (stk_controls[i].id == c->id) {
+			memcpy(c, &stk_controls[i],
+				sizeof(struct v4l2_queryctrl));
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static int stk_vidioc_g_ctrl(struct file *filp,
+		void *priv, struct v4l2_control *c)
+{
+	struct stk_camera *dev = priv;
+	switch (c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		c->value = dev->vsettings.brightness;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int stk_vidioc_s_ctrl(struct file *filp,
+		void *priv, struct v4l2_control *c)
+{
+	struct stk_camera *dev = priv;
+	switch (c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		dev->vsettings.brightness = c->value;
+		return stk_sensor_set_brightness(dev, c->value >> 8);
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+
+static int stk_vidioc_enum_fmt_cap(struct file *filp,
+		void *priv, struct v4l2_fmtdesc *fmtd)
+{
+	fmtd->flags = 0;
+
+	switch (fmtd->index) {
+	case 0:
+		fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
+		strcpy(fmtd->description, "r5g6b5");
+		break;
+	case 1:
+		fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
+		strcpy(fmtd->description, "r5g6b5BE");
+		break;
+	case 2:
+		fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
+		strcpy(fmtd->description, "yuv4:2:2");
+		break;
+	case 3:
+		fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
+		strcpy(fmtd->description, "Raw bayer");
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static struct stk_size {
+	unsigned w;
+	unsigned h;
+	enum stk_mode m;
+} stk_sizes[] = {
+	{ .w = 1280, .h = 1024, .m = MODE_SXGA, },
+	{ .w = 640,  .h = 480,  .m = MODE_VGA,  },
+	{ .w = 352,  .h = 288,  .m = MODE_CIF,  },
+	{ .w = 320,  .h = 240,  .m = MODE_QVGA, },
+	{ .w = 176,  .h = 144,  .m = MODE_QCIF, },
+};
+
+static int stk_vidioc_g_fmt_cap(struct file *filp,
+		void *priv, struct v4l2_format *f)
+{
+	struct v4l2_pix_format *pix_format = &f->fmt.pix;
+	struct stk_camera *dev = priv;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(stk_sizes)
+			&& stk_sizes[i].m != dev->vsettings.mode;
+		i++);
+	if (i == ARRAY_SIZE(stk_sizes)) {
+		STK_ERROR("ERROR: mode invalid\n");
+		return -EINVAL;
+	}
+	pix_format->width = stk_sizes[i].w;
+	pix_format->height = stk_sizes[i].h;
+	pix_format->field = V4L2_FIELD_NONE;
+	pix_format->colorspace = V4L2_COLORSPACE_SRGB;
+	pix_format->priv = 0;
+	pix_format->pixelformat = dev->vsettings.palette;
+	if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
+		pix_format->bytesperline = pix_format->width;
+	else
+		pix_format->bytesperline = 2 * pix_format->width;
+	pix_format->sizeimage = pix_format->bytesperline
+				* pix_format->height;
+	return 0;
+}
+
+static int stk_vidioc_try_fmt_cap(struct file *filp,
+		void *priv, struct v4l2_format *fmtd)
+{
+	int i;
+	switch (fmtd->fmt.pix.pixelformat) {
+	case V4L2_PIX_FMT_RGB565:
+	case V4L2_PIX_FMT_RGB565X:
+	case V4L2_PIX_FMT_UYVY:
+	case V4L2_PIX_FMT_SBGGR8:
+		break;
+	default:
+		return -EINVAL;
+	}
+	for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
+		if (fmtd->fmt.pix.width > stk_sizes[i].w)
+			break;
+	}
+	if (i == ARRAY_SIZE(stk_sizes)
+		|| (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
+			< abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
+		fmtd->fmt.pix.height = stk_sizes[i-1].h;
+		fmtd->fmt.pix.width = stk_sizes[i-1].w;
+		fmtd->fmt.pix.priv = i - 1;
+	} else {
+		fmtd->fmt.pix.height = stk_sizes[i].h;
+		fmtd->fmt.pix.width = stk_sizes[i].w;
+		fmtd->fmt.pix.priv = i;
+	}
+
+	fmtd->fmt.pix.field = V4L2_FIELD_NONE;
+	fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
+	if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
+		fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
+	else
+		fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
+	fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
+		* fmtd->fmt.pix.height;
+	return 0;
+}
+
+static int stk_vidioc_s_fmt_cap(struct file *filp,
+		void *priv, struct v4l2_format *fmtd)
+{
+	int ret;
+	struct stk_camera *dev = priv;
+
+	if (dev == NULL)
+		return -ENODEV;
+	if (!is_present(dev))
+		return -ENODEV;
+	if (is_streaming(dev))
+		return -EBUSY;
+	if (dev->owner && dev->owner != filp)
+		return -EBUSY;
+	dev->owner = filp;
+	ret = stk_vidioc_try_fmt_cap(filp, priv, fmtd);
+	if (ret)
+		return ret;
+
+	dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
+	stk_free_buffers(dev);
+	dev->frame_size = fmtd->fmt.pix.sizeimage;
+	dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;
+
+	stk_initialise(dev);
+	/* This registers controls some timings, not sure of what. */
+	stk_camera_write_reg(dev, 0x001b, 0x0e);
+	if (dev->vsettings.mode == MODE_SXGA)
+		stk_camera_write_reg(dev, 0x001c, 0x0e);
+	else
+		stk_camera_write_reg(dev, 0x001c, 0x46);
+	/*
+	 * Registers 0x0115 0x0114 are the size of each line (bytes),
+	 * regs 0x0117 0x0116 are the heigth of the image.
+	 */
+	stk_camera_write_reg(dev, 0x0115,
+		(fmtd->fmt.pix.bytesperline >> 8) & 0xff);
+	stk_camera_write_reg(dev, 0x0114,
+		fmtd->fmt.pix.bytesperline & 0xff);
+	stk_camera_write_reg(dev, 0x0117,
+		(fmtd->fmt.pix.height >> 8) & 0xff);
+	stk_camera_write_reg(dev, 0x0116,
+		fmtd->fmt.pix.height & 0xff);
+	return stk_sensor_configure(dev);
+}
+
+static int stk_vidioc_reqbufs(struct file *filp,
+		void *priv, struct v4l2_requestbuffers *rb)
+{
+	struct stk_camera *dev = priv;
+
+	if (dev == NULL)
+		return -ENODEV;
+	if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	if (rb->memory != V4L2_MEMORY_MMAP)
+		return -EINVAL;
+	if (is_streaming(dev)
+		|| (dev->owner && dev->owner != filp))
+		return -EBUSY;
+	dev->owner = filp;
+
+	/*FIXME If they ask for zero, we must stop streaming and free */
+	if (rb->count < 3)
+		rb->count = 3;
+	/* Arbitrary limit */
+	else if (rb->count > 5)
+		rb->count = 5;
+
+	stk_allocate_buffers(dev, rb->count);
+	rb->count = dev->n_sbufs;
+	return 0;
+}
+
+static int stk_vidioc_querybuf(struct file *filp,
+		void *priv, struct v4l2_buffer *buf)
+{
+	int index;
+	struct stk_camera *dev = priv;
+	struct stk_sio_buffer *sbuf;
+
+	if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	index = buf->index;
+
+	if (index < 0 || index >= dev->n_sbufs)
+		return -EINVAL;
+	sbuf = dev->sio_bufs + buf->index;
+	*buf = sbuf->v4lbuf;
+	return 0;
+}
+
+static int stk_vidioc_qbuf(struct file *filp,
+		void *priv, struct v4l2_buffer *buf)
+{
+	struct stk_camera *dev = priv;
+	struct stk_sio_buffer *sbuf;
+	unsigned long flags;
+	if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (buf->memory != V4L2_MEMORY_MMAP)
+		return -EINVAL;
+
+	if (buf->index < 0 || buf->index >= dev->n_sbufs)
+		return -EINVAL;
+	sbuf = dev->sio_bufs + buf->index;
+	if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
+		return 0;
+	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
+	sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
+	spin_lock_irqsave(&dev->spinlock, flags);
+	list_add_tail(&sbuf->list, &dev->sio_avail);
+	*buf = sbuf->v4lbuf;
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+	return 0;
+}
+
+static int stk_vidioc_dqbuf(struct file *filp,
+		void *priv, struct v4l2_buffer *buf)
+{
+	struct stk_camera *dev = priv;
+	struct stk_sio_buffer *sbuf;
+	unsigned long flags;
+	int ret;
+
+	if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
+		|| !is_streaming(dev))
+		return -EINVAL;
+
+	if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
+		return -EWOULDBLOCK;
+	ret = wait_event_interruptible(dev->wait_frame,
+		!list_empty(&dev->sio_full) || !is_present(dev));
+	if (ret)
+		return ret;
+	if (!is_present(dev))
+		return -EIO;
+
+	spin_lock_irqsave(&dev->spinlock, flags);
+	sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
+	list_del_init(&sbuf->list);
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+	sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
+	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
+	sbuf->v4lbuf.sequence = ++dev->sequence;
+	do_gettimeofday(&sbuf->v4lbuf.timestamp);
+
+	*buf = sbuf->v4lbuf;
+	return 0;
+}
+
+static int stk_vidioc_streamon(struct file *filp,
+		void *priv, enum v4l2_buf_type type)
+{
+	struct stk_camera *dev = priv;
+	if (is_streaming(dev))
+		return 0;
+	if (dev->sio_bufs == NULL)
+		return -EINVAL;
+	dev->sequence = 0;
+	return stk_start_stream(dev);
+}
+
+static int stk_vidioc_streamoff(struct file *filp,
+		void *priv, enum v4l2_buf_type type)
+{
+	struct stk_camera *dev = priv;
+	unsigned long flags;
+	int i;
+	stk_stop_stream(dev);
+	spin_lock_irqsave(&dev->spinlock, flags);
+	INIT_LIST_HEAD(&dev->sio_avail);
+	INIT_LIST_HEAD(&dev->sio_full);
+	for (i = 0; i < dev->n_sbufs; i++) {
+		INIT_LIST_HEAD(&dev->sio_bufs[i].list);
+		dev->sio_bufs[i].v4lbuf.flags = 0;
+	}
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+	return 0;
+}
+
+
+static int stk_vidioc_g_parm(struct file *filp,
+		void *priv, struct v4l2_streamparm *sp)
+{
+	if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	sp->parm.capture.capability = 0;
+	sp->parm.capture.capturemode = 0;
+	/*FIXME This is not correct */
+	sp->parm.capture.timeperframe.numerator = 1;
+	sp->parm.capture.timeperframe.denominator = 30;
+	sp->parm.capture.readbuffers = 2;
+	sp->parm.capture.extendedmode = 0;
+	return 0;
+}
+
+static struct file_operations v4l_stk_fops = {
+	.owner = THIS_MODULE,
+	.open = v4l_stk_open,
+	.release = v4l_stk_release,
+	.read = v4l_stk_read,
+	.poll = v4l_stk_poll,
+	.mmap = v4l_stk_mmap,
+	.ioctl = video_ioctl2,
+	.llseek = no_llseek
+};
+
+static void stk_v4l_dev_release(struct video_device *vd)
+{
+}
+
+static struct video_device stk_v4l_data = {
+	.name = "stkwebcam",
+	.type = VFL_TYPE_GRABBER,
+	.type2 = VID_TYPE_CAPTURE,
+	.minor = -1,
+	.tvnorms = V4L2_STD_UNKNOWN,
+	.current_norm = V4L2_STD_UNKNOWN,
+	.fops = &v4l_stk_fops,
+	.release = stk_v4l_dev_release,
+
+	.vidioc_querycap = stk_vidioc_querycap,
+	.vidioc_enum_fmt_cap = stk_vidioc_enum_fmt_cap,
+	.vidioc_try_fmt_cap = stk_vidioc_try_fmt_cap,
+	.vidioc_s_fmt_cap = stk_vidioc_s_fmt_cap,
+	.vidioc_g_fmt_cap = stk_vidioc_g_fmt_cap,
+	.vidioc_enum_input = stk_vidioc_enum_input,
+	.vidioc_s_input = stk_vidioc_s_input,
+	.vidioc_g_input = stk_vidioc_g_input,
+	.vidioc_s_std = stk_vidioc_s_std,
+	.vidioc_reqbufs = stk_vidioc_reqbufs,
+	.vidioc_querybuf = stk_vidioc_querybuf,
+	.vidioc_qbuf = stk_vidioc_qbuf,
+	.vidioc_dqbuf = stk_vidioc_dqbuf,
+	.vidioc_streamon = stk_vidioc_streamon,
+	.vidioc_streamoff = stk_vidioc_streamoff,
+	.vidioc_queryctrl = stk_vidioc_queryctrl,
+	.vidioc_g_ctrl = stk_vidioc_g_ctrl,
+	.vidioc_s_ctrl = stk_vidioc_s_ctrl,
+	.vidioc_g_parm = stk_vidioc_g_parm,
+};
+
+
+static int stk_register_video_device(struct stk_camera *dev)
+{
+	int err;
+
+	dev->vdev = stk_v4l_data;
+	dev->vdev.debug = debug;
+	dev->vdev.dev = &dev->interface->dev;
+	dev->vdev.priv = dev;
+	err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
+	if (err)
+		STK_ERROR("v4l registration failed\n");
+	else
+		STK_INFO("Syntek USB2.0 Camera is now controlling video device"
+			" /dev/video%d\n", dev->vdev.minor);
+	return err;
+}
+
+
+/* USB Stuff */
+
+static int stk_camera_probe(struct usb_interface *interface,
+		const struct usb_device_id *id)
+{
+	int i;
+	int err;
+
+	struct stk_camera *dev = NULL;
+	struct usb_device *udev = interface_to_usbdev(interface);
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+
+	dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
+	if (dev == NULL) {
+		STK_ERROR("Out of memory !\n");
+		return -ENOMEM;
+	}
+
+	kref_init(&dev->kref);
+	spin_lock_init(&dev->spinlock);
+	init_waitqueue_head(&dev->wait_frame);
+
+	dev->udev = udev;
+	dev->interface = interface;
+	usb_get_intf(interface);
+
+	dev->vsettings.vflip = vflip;
+	dev->vsettings.hflip = hflip;
+	dev->n_sbufs = 0;
+	set_present(dev);
+
+	/* Set up the endpoint information
+	 * use only the first isoc-in endpoint
+	 * for the current alternate setting */
+	iface_desc = interface->cur_altsetting;
+
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+
+		if (!dev->isoc_ep
+			&& ((endpoint->bEndpointAddress
+				& USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
+			&& ((endpoint->bmAttributes
+				& USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_ISOC)) {
+			/* we found an isoc in endpoint */
+			dev->isoc_ep = (endpoint->bEndpointAddress & 0xF);
+			break;
+		}
+	}
+	if (!dev->isoc_ep) {
+		STK_ERROR("Could not find isoc-in endpoint");
+		kref_put(&dev->kref, stk_camera_cleanup);
+		return -ENODEV;
+	}
+	dev->vsettings.brightness = 0x7fff;
+	dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
+	dev->vsettings.mode = MODE_VGA;
+	dev->frame_size = 640*480*2;
+
+	INIT_LIST_HEAD(&dev->sio_avail);
+	INIT_LIST_HEAD(&dev->sio_full);
+
+	usb_set_intfdata(interface, dev);
+
+	err = stk_register_video_device(dev);
+	if (err) {
+		kref_put(&dev->kref, stk_camera_cleanup);
+		return err;
+	}
+
+	stk_create_sysfs_files(&dev->vdev);
+
+	return 0;
+}
+
+static void stk_camera_disconnect(struct usb_interface *interface)
+{
+	struct stk_camera *dev = usb_get_intfdata(interface);
+
+	usb_set_intfdata(interface, NULL);
+	unset_present(dev);
+
+	wake_up_interruptible(&dev->wait_frame);
+	stk_remove_sysfs_files(&dev->vdev);
+
+	kref_put(&dev->kref, stk_camera_cleanup);
+}
+
+static struct usb_driver stk_camera_driver = {
+	.name = "stkwebcam",
+	.probe = stk_camera_probe,
+	.disconnect = stk_camera_disconnect,
+	.id_table = stkwebcam_table,
+};
+
+
+static int __init stk_camera_init(void)
+{
+	int result;
+
+	result = usb_register(&stk_camera_driver);
+	if (result)
+		STK_ERROR("usb_register failed ! Error number %d\n", result);
+
+
+	return result;
+}
+
+static void __exit stk_camera_exit(void)
+{
+	usb_deregister(&stk_camera_driver);
+}
+
+module_init(stk_camera_init);
+module_exit(stk_camera_exit);
+
+