Merge master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb

* master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb: (33 commits)
  V4L/DVB (3604): V4l printk fix
  V4L/DVB (3599c): Whitespace cleanups under Documentation/video4linux
  V4L/DVB (3599b): Whitespace cleanups under drivers/media
  V4L/DVB (3599a): Move drivers/usb/media to drivers/media/video
  V4L/DVB (3599): Implement new routing commands for wm8775 and cs53l32a.
  V4L/DVB (3598): Add bit algorithm adapter for the Conexant CX2341X boards.
  V4L/DVB (3597): Vivi: fix warning: implicit declaration of function 'in_interrupt'
  V4L/DVB (3588): Remove VIDIOC_G/S_AUDOUT from msp3400
  V4L/DVB (3587): Always wake thread after routing change.
  V4L/DVB (3584): Implement V4L2_TUNER_MODE_LANG1_LANG2 audio mode
  V4L/DVB (3582): Implement correct msp3400 input/output routing
  V4L/DVB (3581): Add new media/msp3400.h header containing the routing macros
  V4L/DVB (3580): Last round of msp3400 cleanups before adding routing commands
  V4L/DVB (3579): Move msp_modus to msp3400-kthreads, add JP and KR std detection
  V4L/DVB (3578): Make scart definitions easier to handle
  V4L/DVB (3577): Cleanup audio input handling
  V4L/DVB (3575): Cxusb: fix i2c debug messages for bluebird devices
  V4L/DVB (3574): Cxusb: fix debug messages
  V4L/DVB (3573): Cxusb: remove FIXME: comment in bluebird_patch_dvico_firmware_download
  V4L/DVB (3572): Cxusb: conditionalize gpio write for the medion box
  ...

1 files changed, 2919 insertions, 0 deletions

diff --git a/drivers/media/video/sn9c102/sn9c102_core.c b/drivers/media/video/sn9c102/sn9c102_core.c
new file mode 100644
index 00000000000..ea4394dc941
--- /dev/null
+++ b/drivers/media/video/sn9c102/sn9c102_core.c
@@ -0,0 +1,2919 @@
+/***************************************************************************
+ * V4L2 driver for SN9C10x PC Camera Controllers                           *
+ *                                                                         *
+ * Copyright (C) 2004-2006 by Luca Risolia <luca.risolia@studio.unibo.it>  *
+ *                                                                         *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/moduleparam.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/compiler.h>
+#include <linux/ioctl.h>
+#include <linux/poll.h>
+#include <linux/stat.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/page-flags.h>
+#include <linux/byteorder/generic.h>
+#include <asm/page.h>
+#include <asm/uaccess.h>
+
+#include "sn9c102.h"
+
+/*****************************************************************************/
+
+#define SN9C102_MODULE_NAME     "V4L2 driver for SN9C10x PC Camera Controllers"
+#define SN9C102_MODULE_AUTHOR   "(C) 2004-2006 Luca Risolia"
+#define SN9C102_AUTHOR_EMAIL    "<luca.risolia@studio.unibo.it>"
+#define SN9C102_MODULE_LICENSE  "GPL"
+#define SN9C102_MODULE_VERSION  "1:1.27"
+#define SN9C102_MODULE_VERSION_CODE  KERNEL_VERSION(1, 0, 27)
+
+/*****************************************************************************/
+
+MODULE_DEVICE_TABLE(usb, sn9c102_id_table);
+
+MODULE_AUTHOR(SN9C102_MODULE_AUTHOR " " SN9C102_AUTHOR_EMAIL);
+MODULE_DESCRIPTION(SN9C102_MODULE_NAME);
+MODULE_VERSION(SN9C102_MODULE_VERSION);
+MODULE_LICENSE(SN9C102_MODULE_LICENSE);
+
+static short video_nr[] = {[0 ... SN9C102_MAX_DEVICES-1] = -1};
+module_param_array(video_nr, short, NULL, 0444);
+MODULE_PARM_DESC(video_nr,
+		 "\n<-1|n[,...]> Specify V4L2 minor mode number."
+		 "\n -1 = use next available (default)"
+		 "\n  n = use minor number n (integer >= 0)"
+		 "\nYou can specify up to "__MODULE_STRING(SN9C102_MAX_DEVICES)
+		 " cameras this way."
+		 "\nFor example:"
+		 "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
+		 "\nthe second camera and use auto for the first"
+		 "\none and for every other camera."
+		 "\n");
+
+static short force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
+			       SN9C102_FORCE_MUNMAP};
+module_param_array(force_munmap, bool, NULL, 0444);
+MODULE_PARM_DESC(force_munmap,
+		 "\n<0|1[,...]> Force the application to unmap previously"
+		 "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
+		 "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
+		 "\nthis feature. This parameter is specific for each"
+		 "\ndetected camera."
+		 "\n 0 = do not force memory unmapping"
+		 "\n 1 = force memory unmapping (save memory)"
+		 "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
+		 "\n");
+
+static unsigned int frame_timeout[] = {[0 ... SN9C102_MAX_DEVICES-1] =
+				       SN9C102_FRAME_TIMEOUT};
+module_param_array(frame_timeout, uint, NULL, 0644);
+MODULE_PARM_DESC(frame_timeout,
+		 "\n<n[,...]> Timeout for a video frame in seconds."
+		 "\nThis parameter is specific for each detected camera."
+		 "\nDefault value is "__MODULE_STRING(SN9C102_FRAME_TIMEOUT)"."
+		 "\n");
+
+#ifdef SN9C102_DEBUG
+static unsigned short debug = SN9C102_DEBUG_LEVEL;
+module_param(debug, ushort, 0644);
+MODULE_PARM_DESC(debug,
+		 "\n<n> Debugging information level, from 0 to 3:"
+		 "\n0 = none (use carefully)"
+		 "\n1 = critical errors"
+		 "\n2 = significant informations"
+		 "\n3 = more verbose messages"
+		 "\nLevel 3 is useful for testing only, when only "
+		 "one device is used."
+		 "\nDefault value is "__MODULE_STRING(SN9C102_DEBUG_LEVEL)"."
+		 "\n");
+#endif
+
+/*****************************************************************************/
+
+static sn9c102_sof_header_t sn9c102_sof_header[] = {
+	{0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x00},
+	{0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x01},
+};
+
+static sn9c103_sof_header_t sn9c103_sof_header[] = {
+	{0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x20},
+};
+
+static sn9c102_eof_header_t sn9c102_eof_header[] = {
+	{0x00, 0x00, 0x00, 0x00},
+	{0x40, 0x00, 0x00, 0x00},
+	{0x80, 0x00, 0x00, 0x00},
+	{0xc0, 0x00, 0x00, 0x00},
+};
+
+/*****************************************************************************/
+
+static u32
+sn9c102_request_buffers(struct sn9c102_device* cam, u32 count,
+			enum sn9c102_io_method io)
+{
+	struct v4l2_pix_format* p = &(cam->sensor.pix_format);
+	struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
+	const size_t imagesize = cam->module_param.force_munmap ||
+				 io == IO_READ ?
+				 (p->width * p->height * p->priv) / 8 :
+				 (r->width * r->height * p->priv) / 8;
+	void* buff = NULL;
+	u32 i;
+
+	if (count > SN9C102_MAX_FRAMES)
+		count = SN9C102_MAX_FRAMES;
+
+	cam->nbuffers = count;
+	while (cam->nbuffers > 0) {
+		if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
+			break;
+		cam->nbuffers--;
+	}
+
+	for (i = 0; i < cam->nbuffers; i++) {
+		cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
+		cam->frame[i].buf.index = i;
+		cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
+		cam->frame[i].buf.length = imagesize;
+		cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		cam->frame[i].buf.sequence = 0;
+		cam->frame[i].buf.field = V4L2_FIELD_NONE;
+		cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
+		cam->frame[i].buf.flags = 0;
+	}
+
+	return cam->nbuffers;
+}
+
+
+static void sn9c102_release_buffers(struct sn9c102_device* cam)
+{
+	if (cam->nbuffers) {
+		vfree(cam->frame[0].bufmem);
+		cam->nbuffers = 0;
+	}
+	cam->frame_current = NULL;
+}
+
+
+static void sn9c102_empty_framequeues(struct sn9c102_device* cam)
+{
+	u32 i;
+
+	INIT_LIST_HEAD(&cam->inqueue);
+	INIT_LIST_HEAD(&cam->outqueue);
+
+	for (i = 0; i < SN9C102_MAX_FRAMES; i++) {
+		cam->frame[i].state = F_UNUSED;
+		cam->frame[i].buf.bytesused = 0;
+	}
+}
+
+
+static void sn9c102_requeue_outqueue(struct sn9c102_device* cam)
+{
+	struct sn9c102_frame_t *i;
+
+	list_for_each_entry(i, &cam->outqueue, frame) {
+		i->state = F_QUEUED;
+		list_add(&i->frame, &cam->inqueue);
+	}
+
+	INIT_LIST_HEAD(&cam->outqueue);
+}
+
+
+static void sn9c102_queue_unusedframes(struct sn9c102_device* cam)
+{
+	unsigned long lock_flags;
+	u32 i;
+
+	for (i = 0; i < cam->nbuffers; i++)
+		if (cam->frame[i].state == F_UNUSED) {
+			cam->frame[i].state = F_QUEUED;
+			spin_lock_irqsave(&cam->queue_lock, lock_flags);
+			list_add_tail(&cam->frame[i].frame, &cam->inqueue);
+			spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
+		}
+}
+
+/*****************************************************************************/
+
+int sn9c102_write_regs(struct sn9c102_device* cam, u8* buff, u16 index)
+{
+	struct usb_device* udev = cam->usbdev;
+	int i, res;
+
+	if (index + sizeof(buff) >= ARRAY_SIZE(cam->reg))
+		return -1;
+
+	res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
+			      index, 0, buff, sizeof(buff),
+			      SN9C102_CTRL_TIMEOUT*sizeof(buff));
+	if (res < 0) {
+		DBG(3, "Failed to write registers (index 0x%02X, error %d)",
+		    index, res);
+		return -1;
+	}
+
+	for (i = 0; i < sizeof(buff); i++)
+		cam->reg[index+i] = buff[i];
+
+	return 0;
+}
+
+
+int sn9c102_write_reg(struct sn9c102_device* cam, u8 value, u16 index)
+{
+	struct usb_device* udev = cam->usbdev;
+	u8* buff = cam->control_buffer;
+	int res;
+
+	if (index >= ARRAY_SIZE(cam->reg))
+		return -1;
+
+	*buff = value;
+
+	res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
+			      index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
+	if (res < 0) {
+		DBG(3, "Failed to write a register (value 0x%02X, index "
+		       "0x%02X, error %d)", value, index, res);
+		return -1;
+	}
+
+	cam->reg[index] = value;
+
+	return 0;
+}
+
+
+/* NOTE: reading some registers always returns 0 */
+static int sn9c102_read_reg(struct sn9c102_device* cam, u16 index)
+{
+	struct usb_device* udev = cam->usbdev;
+	u8* buff = cam->control_buffer;
+	int res;
+
+	res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
+			      index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
+	if (res < 0)
+		DBG(3, "Failed to read a register (index 0x%02X, error %d)",
+		    index, res);
+
+	return (res >= 0) ? (int)(*buff) : -1;
+}
+
+
+int sn9c102_pread_reg(struct sn9c102_device* cam, u16 index)
+{
+	if (index >= ARRAY_SIZE(cam->reg))
+		return -1;
+
+	return cam->reg[index];
+}
+
+
+static int
+sn9c102_i2c_wait(struct sn9c102_device* cam, struct sn9c102_sensor* sensor)
+{
+	int i, r;
+
+	for (i = 1; i <= 5; i++) {
+		r = sn9c102_read_reg(cam, 0x08);
+		if (r < 0)
+			return -EIO;
+		if (r & 0x04)
+			return 0;
+		if (sensor->frequency & SN9C102_I2C_400KHZ)
+			udelay(5*16);
+		else
+			udelay(16*16);
+	}
+	return -EBUSY;
+}
+
+
+static int
+sn9c102_i2c_detect_read_error(struct sn9c102_device* cam,
+			      struct sn9c102_sensor* sensor)
+{
+	int r;
+	r = sn9c102_read_reg(cam, 0x08);
+	return (r < 0 || (r >= 0 && !(r & 0x08))) ? -EIO : 0;
+}
+
+
+static int
+sn9c102_i2c_detect_write_error(struct sn9c102_device* cam,
+			       struct sn9c102_sensor* sensor)
+{
+	int r;
+	r = sn9c102_read_reg(cam, 0x08);
+	return (r < 0 || (r >= 0 && (r & 0x08))) ? -EIO : 0;
+}
+
+
+int
+sn9c102_i2c_try_raw_read(struct sn9c102_device* cam,
+			 struct sn9c102_sensor* sensor, u8 data0, u8 data1,
+			 u8 n, u8 buffer[])
+{
+	struct usb_device* udev = cam->usbdev;
+	u8* data = cam->control_buffer;
+	int err = 0, res;
+
+	/* Write cycle */
+	data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
+		  ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) | 0x10;
+	data[1] = data0; /* I2C slave id */
+	data[2] = data1; /* address */
+	data[7] = 0x10;
+	res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
+			      0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
+	if (res < 0)
+		err += res;
+
+	err += sn9c102_i2c_wait(cam, sensor);
+
+	/* Read cycle - n bytes */
+	data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
+		  ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) |
+		  (n << 4) | 0x02;
+	data[1] = data0;
+	data[7] = 0x10;
+	res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
+			      0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
+	if (res < 0)
+		err += res;
+
+	err += sn9c102_i2c_wait(cam, sensor);
+
+	/* The first read byte will be placed in data[4] */
+	res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
+			      0x0a, 0, data, 5, SN9C102_CTRL_TIMEOUT);
+	if (res < 0)
+		err += res;
+
+	err += sn9c102_i2c_detect_read_error(cam, sensor);
+
+	PDBGG("I2C read: address 0x%02X, first read byte: 0x%02X", data1,
+	      data[4]);
+
+	if (err) {
+		DBG(3, "I2C read failed for %s image sensor", sensor->name);
+		return -1;
+	}
+
+	if (buffer)
+		memcpy(buffer, data, sizeof(buffer));
+
+	return (int)data[4];
+}
+
+
+int
+sn9c102_i2c_try_raw_write(struct sn9c102_device* cam,
+			  struct sn9c102_sensor* sensor, u8 n, u8 data0,
+			  u8 data1, u8 data2, u8 data3, u8 data4, u8 data5)
+{
+	struct usb_device* udev = cam->usbdev;
+	u8* data = cam->control_buffer;
+	int err = 0, res;
+
+	/* Write cycle. It usually is address + value */
+	data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
+		  ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0)
+		  | ((n - 1) << 4);
+	data[1] = data0;
+	data[2] = data1;
+	data[3] = data2;
+	data[4] = data3;
+	data[5] = data4;
+	data[6] = data5;
+	data[7] = 0x14;
+	res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
+			      0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
+	if (res < 0)
+		err += res;
+
+	err += sn9c102_i2c_wait(cam, sensor);
+	err += sn9c102_i2c_detect_write_error(cam, sensor);
+
+	if (err)
+		DBG(3, "I2C write failed for %s image sensor", sensor->name);
+
+	PDBGG("I2C raw write: %u bytes, data0 = 0x%02X, data1 = 0x%02X, "
+	      "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X",
+	      n, data0, data1, data2, data3, data4, data5);
+
+	return err ? -1 : 0;
+}
+
+
+int
+sn9c102_i2c_try_read(struct sn9c102_device* cam,
+		     struct sn9c102_sensor* sensor, u8 address)
+{
+	return sn9c102_i2c_try_raw_read(cam, sensor, sensor->i2c_slave_id,
+					address, 1, NULL);
+}
+
+
+int
+sn9c102_i2c_try_write(struct sn9c102_device* cam,
+		      struct sn9c102_sensor* sensor, u8 address, u8 value)
+{
+	return sn9c102_i2c_try_raw_write(cam, sensor, 3,
+					 sensor->i2c_slave_id, address,
+					 value, 0, 0, 0);
+}
+
+
+int sn9c102_i2c_read(struct sn9c102_device* cam, u8 address)
+{
+	return sn9c102_i2c_try_read(cam, &cam->sensor, address);
+}
+
+
+int sn9c102_i2c_write(struct sn9c102_device* cam, u8 address, u8 value)
+{
+	return sn9c102_i2c_try_write(cam, &cam->sensor, address, value);
+}
+
+/*****************************************************************************/
+
+static void*
+sn9c102_find_sof_header(struct sn9c102_device* cam, void* mem, size_t len)
+{
+	size_t soflen = 0, i;
+	u8 j, n = 0;
+
+	switch (cam->bridge) {
+	case BRIDGE_SN9C101:
+	case BRIDGE_SN9C102:
+		soflen = sizeof(sn9c102_sof_header_t);
+		n = sizeof(sn9c102_sof_header) / soflen;
+		break;
+	case BRIDGE_SN9C103:
+		soflen = sizeof(sn9c103_sof_header_t);
+		n = sizeof(sn9c103_sof_header) / soflen;
+	}
+
+	for (i = 0; (len >= soflen) && (i <= len - soflen); i++)
+		for (j = 0; j < n; j++)
+			/* The invariable part of the header is 6 bytes long */
+			if ((cam->bridge != BRIDGE_SN9C103 &&
+			    !memcmp(mem + i, sn9c102_sof_header[j], 6)) ||
+			    (cam->bridge == BRIDGE_SN9C103 &&
+			    !memcmp(mem + i, sn9c103_sof_header[j], 6))) {
+				memcpy(cam->sof_header, mem + i, soflen);
+				/* Skip the header */
+				return mem + i + soflen;
+			}
+
+	return NULL;
+}
+
+
+static void*
+sn9c102_find_eof_header(struct sn9c102_device* cam, void* mem, size_t len)
+{
+	size_t eoflen = sizeof(sn9c102_eof_header_t), i;
+	unsigned j, n = sizeof(sn9c102_eof_header) / eoflen;
+
+	if (cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
+		return NULL; /* EOF header does not exist in compressed data */
+
+	for (i = 0; (len >= eoflen) && (i <= len - eoflen); i++)
+		for (j = 0; j < n; j++)
+			if (!memcmp(mem + i, sn9c102_eof_header[j], eoflen))
+				return mem + i;
+
+	return NULL;
+}
+
+
+static void sn9c102_urb_complete(struct urb *urb, struct pt_regs* regs)
+{
+	struct sn9c102_device* cam = urb->context;
+	struct sn9c102_frame_t** f;
+	size_t imagesize, soflen;
+	u8 i;
+	int err = 0;
+
+	if (urb->status == -ENOENT)
+		return;
+
+	f = &cam->frame_current;
+
+	if (cam->stream == STREAM_INTERRUPT) {
+		cam->stream = STREAM_OFF;
+		if ((*f))
+			(*f)->state = F_QUEUED;
+		DBG(3, "Stream interrupted");
+		wake_up(&cam->wait_stream);
+	}
+
+	if (cam->state & DEV_DISCONNECTED)
+		return;
+
+	if (cam->state & DEV_MISCONFIGURED) {
+		wake_up_interruptible(&cam->wait_frame);
+		return;
+	}
+
+	if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
+		goto resubmit_urb;
+
+	if (!(*f))
+		(*f) = list_entry(cam->inqueue.next, struct sn9c102_frame_t,
+				  frame);
+
+	imagesize = (cam->sensor.pix_format.width *
+		     cam->sensor.pix_format.height *
+		     cam->sensor.pix_format.priv) / 8;
+
+	soflen = (cam->bridge) == BRIDGE_SN9C103 ?
+				  sizeof(sn9c103_sof_header_t) :
+				  sizeof(sn9c102_sof_header_t);
+
+	for (i = 0; i < urb->number_of_packets; i++) {
+		unsigned int img, len, status;
+		void *pos, *sof, *eof;
+
+		len = urb->iso_frame_desc[i].actual_length;
+		status = urb->iso_frame_desc[i].status;
+		pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
+
+		if (status) {
+			DBG(3, "Error in isochronous frame");
+			(*f)->state = F_ERROR;
+			continue;
+		}
+
+		PDBGG("Isochrnous frame: length %u, #%u i", len, i);
+
+redo:
+		sof = sn9c102_find_sof_header(cam, pos, len);
+		if (likely(!sof)) {
+			eof = sn9c102_find_eof_header(cam, pos, len);
+			if ((*f)->state == F_GRABBING) {
+end_of_frame:
+				img = len;
+
+				if (eof)
+					img = (eof > pos) ? eof - pos - 1 : 0;
+
+				if ((*f)->buf.bytesused+img > imagesize) {
+					u32 b;
+					b = (*f)->buf.bytesused + img -
+					    imagesize;
+					img = imagesize - (*f)->buf.bytesused;
+					DBG(3, "Expected EOF not found: "
+					       "video frame cut");
+					if (eof)
+						DBG(3, "Exceeded limit: +%u "
+						       "bytes", (unsigned)(b));
+				}
+
+				memcpy((*f)->bufmem + (*f)->buf.bytesused, pos,
+				       img);
+
+				if ((*f)->buf.bytesused == 0)
+					do_gettimeofday(&(*f)->buf.timestamp);
+
+				(*f)->buf.bytesused += img;
+
+				if ((*f)->buf.bytesused == imagesize ||
+				    (cam->sensor.pix_format.pixelformat ==
+						V4L2_PIX_FMT_SN9C10X && eof)) {
+					u32 b;
+					b = (*f)->buf.bytesused;
+					(*f)->state = F_DONE;
+					(*f)->buf.sequence= ++cam->frame_count;
+					spin_lock(&cam->queue_lock);
+					list_move_tail(&(*f)->frame,
+						       &cam->outqueue);
+					if (!list_empty(&cam->inqueue))
+						(*f) = list_entry(
+							cam->inqueue.next,
+							struct sn9c102_frame_t,
+							frame );
+					else
+						(*f) = NULL;
+					spin_unlock(&cam->queue_lock);
+					memcpy(cam->sysfs.frame_header,
+					       cam->sof_header, soflen);
+					DBG(3, "Video frame captured: %lu "
+					       "bytes", (unsigned long)(b));
+
+					if (!(*f))
+						goto resubmit_urb;
+
+				} else if (eof) {
+					(*f)->state = F_ERROR;
+					DBG(3, "Not expected EOF after %lu "
+					       "bytes of image data",
+					    (unsigned long)
+					    ((*f)->buf.bytesused));
+				}
+
+				if (sof) /* (1) */
+					goto start_of_frame;
+
+			} else if (eof) {
+				DBG(3, "EOF without SOF");
+				continue;
+
+			} else {
+				PDBGG("Ignoring pointless isochronous frame");
+				continue;
+			}
+
+		} else if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR) {
+start_of_frame:
+			(*f)->state = F_GRABBING;
+			(*f)->buf.bytesused = 0;
+			len -= (sof - pos);
+			pos = sof;
+			DBG(3, "SOF detected: new video frame");
+			if (len)
+				goto redo;
+
+		} else if ((*f)->state == F_GRABBING) {
+			eof = sn9c102_find_eof_header(cam, pos, len);
+			if (eof && eof < sof)
+				goto end_of_frame; /* (1) */
+			else {
+				if (cam->sensor.pix_format.pixelformat ==
+				    V4L2_PIX_FMT_SN9C10X) {
+					eof = sof - soflen;
+					goto end_of_frame;
+				} else {
+					DBG(3, "SOF before expected EOF after "
+					       "%lu bytes of image data",
+					    (unsigned long)
+					    ((*f)->buf.bytesused));
+					goto start_of_frame;
+				}
+			}
+		}
+	}
+
+resubmit_urb:
+	urb->dev = cam->usbdev;
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (err < 0 && err != -EPERM) {
+		cam->state |= DEV_MISCONFIGURED;
+		DBG(1, "usb_submit_urb() failed");
+	}
+
+	wake_up_interruptible(&cam->wait_frame);
+}
+
+
+static int sn9c102_start_transfer(struct sn9c102_device* cam)
+{
+	struct usb_device *udev = cam->usbdev;
+	struct urb* urb;
+	const unsigned int sn9c102_wMaxPacketSize[] = {0, 128, 256, 384, 512,
+						       680, 800, 900, 1023};
+	const unsigned int sn9c103_wMaxPacketSize[] = {0, 128, 256, 384, 512,
+						       680, 800, 900, 1003};
+	const unsigned int psz = (cam->bridge == BRIDGE_SN9C103) ?
+			    sn9c103_wMaxPacketSize[SN9C102_ALTERNATE_SETTING] :
+			    sn9c102_wMaxPacketSize[SN9C102_ALTERNATE_SETTING];
+	s8 i, j;
+	int err = 0;
+
+	for (i = 0; i < SN9C102_URBS; i++) {
+		cam->transfer_buffer[i] = kzalloc(SN9C102_ISO_PACKETS * psz,
+						  GFP_KERNEL);
+		if (!cam->transfer_buffer[i]) {
+			err = -ENOMEM;
+			DBG(1, "Not enough memory");
+			goto free_buffers;
+		}
+	}
+
+	for (i = 0; i < SN9C102_URBS; i++) {
+		urb = usb_alloc_urb(SN9C102_ISO_PACKETS, GFP_KERNEL);
+		cam->urb[i] = urb;
+		if (!urb) {
+			err = -ENOMEM;
+			DBG(1, "usb_alloc_urb() failed");
+			goto free_urbs;
+		}
+		urb->dev = udev;
+		urb->context = cam;
+		urb->pipe = usb_rcvisocpipe(udev, 1);
+		urb->transfer_flags = URB_ISO_ASAP;
+		urb->number_of_packets = SN9C102_ISO_PACKETS;
+		urb->complete = sn9c102_urb_complete;
+		urb->transfer_buffer = cam->transfer_buffer[i];
+		urb->transfer_buffer_length = psz * SN9C102_ISO_PACKETS;
+		urb->interval = 1;
+		for (j = 0; j < SN9C102_ISO_PACKETS; j++) {
+			urb->iso_frame_desc[j].offset = psz * j;
+			urb->iso_frame_desc[j].length = psz;
+		}
+	}
+
+	/* Enable video */
+	if (!(cam->reg[0x01] & 0x04)) {
+		err = sn9c102_write_reg(cam, cam->reg[0x01] | 0x04, 0x01);
+		if (err) {
+			err = -EIO;
+			DBG(1, "I/O hardware error");
+			goto free_urbs;
+		}
+	}
+
+	err = usb_set_interface(udev, 0, SN9C102_ALTERNATE_SETTING);
+	if (err) {
+		DBG(1, "usb_set_interface() failed");
+		goto free_urbs;
+	}
+
+	cam->frame_current = NULL;
+
+	for (i = 0; i < SN9C102_URBS; i++) {
+		err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
+		if (err) {
+			for (j = i-1; j >= 0; j--)
+				usb_kill_urb(cam->urb[j]);
+			DBG(1, "usb_submit_urb() failed, error %d", err);
+			goto free_urbs;
+		}
+	}
+
+	return 0;
+
+free_urbs:
+	for (i = 0; (i < SN9C102_URBS) &&  cam->urb[i]; i++)
+		usb_free_urb(cam->urb[i]);
+
+free_buffers:
+	for (i = 0; (i < SN9C102_URBS) && cam->transfer_buffer[i]; i++)
+		kfree(cam->transfer_buffer[i]);
+
+	return err;
+}
+
+
+static int sn9c102_stop_transfer(struct sn9c102_device* cam)
+{
+	struct usb_device *udev = cam->usbdev;
+	s8 i;
+	int err = 0;
+
+	if (cam->state & DEV_DISCONNECTED)
+		return 0;
+
+	for (i = SN9C102_URBS-1; i >= 0; i--) {
+		usb_kill_urb(cam->urb[i]);
+		usb_free_urb(cam->urb[i]);
+		kfree(cam->transfer_buffer[i]);
+	}
+
+	err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
+	if (err)
+		DBG(3, "usb_set_interface() failed");
+
+	return err;
+}
+
+
+static int sn9c102_stream_interrupt(struct sn9c102_device* cam)
+{
+	long timeout;
+
+	cam->stream = STREAM_INTERRUPT;
+	timeout = wait_event_timeout(cam->wait_stream,
+				     (cam->stream == STREAM_OFF) ||
+				     (cam->state & DEV_DISCONNECTED),
+				     SN9C102_URB_TIMEOUT);
+	if (cam->state & DEV_DISCONNECTED)
+		return -ENODEV;
+	else if (cam->stream != STREAM_OFF) {
+		cam->state |= DEV_MISCONFIGURED;
+		DBG(1, "URB timeout reached. The camera is misconfigured. "
+		       "To use it, close and open /dev/video%d again.",
+		    cam->v4ldev->minor);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/*****************************************************************************/
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static u8 sn9c102_strtou8(const char* buff, size_t len, ssize_t* count)
+{
+	char str[5];
+	char* endp;
+	unsigned long val;
+
+	if (len < 4) {
+		strncpy(str, buff, len);
+		str[len+1] = '\0';
+	} else {
+		strncpy(str, buff, 4);
+		str[4] = '\0';
+	}
+
+	val = simple_strtoul(str, &endp, 0);
+
+	*count = 0;
+	if (val <= 0xff)
+		*count = (ssize_t)(endp - str);
+	if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
+		*count += 1;
+
+	return (u8)val;
+}
+
+/*
+   NOTE 1: being inside one of the following methods implies that the v4l
+	   device exists for sure (see kobjects and reference counters)
+   NOTE 2: buffers are PAGE_SIZE long
+*/
+
+static ssize_t sn9c102_show_reg(struct class_device* cd, char* buf)
+{
+	struct sn9c102_device* cam;
+	ssize_t count;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	count = sprintf(buf, "%u\n", cam->sysfs.reg);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t
+sn9c102_store_reg(struct class_device* cd, const char* buf, size_t len)
+{
+	struct sn9c102_device* cam;
+	u8 index;
+	ssize_t count;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	index = sn9c102_strtou8(buf, len, &count);
+	if (index > 0x1f || !count) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EINVAL;
+	}
+
+	cam->sysfs.reg = index;
+
+	DBG(2, "Moved SN9C10X register index to 0x%02X", cam->sysfs.reg);
+	DBG(3, "Written bytes: %zd", count);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t sn9c102_show_val(struct class_device* cd, char* buf)
+{
+	struct sn9c102_device* cam;
+	ssize_t count;
+	int val;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	if ((val = sn9c102_read_reg(cam, cam->sysfs.reg)) < 0) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EIO;
+	}
+
+	count = sprintf(buf, "%d\n", val);
+
+	DBG(3, "Read bytes: %zd", count);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t
+sn9c102_store_val(struct class_device* cd, const char* buf, size_t len)
+{
+	struct sn9c102_device* cam;
+	u8 value;
+	ssize_t count;
+	int err;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	value = sn9c102_strtou8(buf, len, &count);
+	if (!count) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EINVAL;
+	}
+
+	err = sn9c102_write_reg(cam, value, cam->sysfs.reg);
+	if (err) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EIO;
+	}
+
+	DBG(2, "Written SN9C10X reg. 0x%02X, val. 0x%02X",
+	    cam->sysfs.reg, value);
+	DBG(3, "Written bytes: %zd", count);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t sn9c102_show_i2c_reg(struct class_device* cd, char* buf)
+{
+	struct sn9c102_device* cam;
+	ssize_t count;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
+
+	DBG(3, "Read bytes: %zd", count);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t
+sn9c102_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
+{
+	struct sn9c102_device* cam;
+	u8 index;
+	ssize_t count;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	index = sn9c102_strtou8(buf, len, &count);
+	if (!count) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EINVAL;
+	}
+
+	cam->sysfs.i2c_reg = index;
+
+	DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
+	DBG(3, "Written bytes: %zd", count);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t sn9c102_show_i2c_val(struct class_device* cd, char* buf)
+{
+	struct sn9c102_device* cam;
+	ssize_t count;
+	int val;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	if (!(cam->sensor.sysfs_ops & SN9C102_I2C_READ)) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENOSYS;
+	}
+
+	if ((val = sn9c102_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EIO;
+	}
+
+	count = sprintf(buf, "%d\n", val);
+
+	DBG(3, "Read bytes: %zd", count);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t
+sn9c102_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
+{
+	struct sn9c102_device* cam;
+	u8 value;
+	ssize_t count;
+	int err;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	if (!(cam->sensor.sysfs_ops & SN9C102_I2C_WRITE)) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENOSYS;
+	}
+
+	value = sn9c102_strtou8(buf, len, &count);
+	if (!count) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EINVAL;
+	}
+
+	err = sn9c102_i2c_write(cam, cam->sysfs.i2c_reg, value);
+	if (err) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -EIO;
+	}
+
+	DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
+	    cam->sysfs.i2c_reg, value);
+	DBG(3, "Written bytes: %zd", count);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	return count;
+}
+
+
+static ssize_t
+sn9c102_store_green(struct class_device* cd, const char* buf, size_t len)
+{
+	struct sn9c102_device* cam;
+	enum sn9c102_bridge bridge;
+	ssize_t res = 0;
+	u8 value;
+	ssize_t count;
+
+	if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam) {
+		mutex_unlock(&sn9c102_sysfs_lock);
+		return -ENODEV;
+	}
+
+	bridge = cam->bridge;
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	value = sn9c102_strtou8(buf, len, &count);
+	if (!count)
+		return -EINVAL;
+
+	switch (bridge) {
+	case BRIDGE_SN9C101:
+	case BRIDGE_SN9C102:
+		if (value > 0x0f)
+			return -EINVAL;
+		if ((res = sn9c102_store_reg(cd, "0x11", 4)) >= 0)
+			res = sn9c102_store_val(cd, buf, len);
+		break;
+	case BRIDGE_SN9C103:
+		if (value > 0x7f)
+			return -EINVAL;
+		if ((res = sn9c102_store_reg(cd, "0x04", 4)) >= 0)
+			res = sn9c102_store_val(cd, buf, len);
+		break;
+	}
+
+	return res;
+}
+
+
+static ssize_t
+sn9c102_store_blue(struct class_device* cd, const char* buf, size_t len)
+{
+	ssize_t res = 0;
+	u8 value;
+	ssize_t count;
+
+	value = sn9c102_strtou8(buf, len, &count);
+	if (!count || value > 0x7f)
+		return -EINVAL;
+
+	if ((res = sn9c102_store_reg(cd, "0x06", 4)) >= 0)
+		res = sn9c102_store_val(cd, buf, len);
+
+	return res;
+}
+
+
+static ssize_t
+sn9c102_store_red(struct class_device* cd, const char* buf, size_t len)
+{
+	ssize_t res = 0;
+	u8 value;
+	ssize_t count;
+
+	value = sn9c102_strtou8(buf, len, &count);
+	if (!count || value > 0x7f)
+		return -EINVAL;
+
+	if ((res = sn9c102_store_reg(cd, "0x05", 4)) >= 0)
+		res = sn9c102_store_val(cd, buf, len);
+
+	return res;
+}
+
+
+static ssize_t sn9c102_show_frame_header(struct class_device* cd, char* buf)
+{
+	struct sn9c102_device* cam;
+	ssize_t count;
+
+	cam = video_get_drvdata(to_video_device(cd));
+	if (!cam)
+		return -ENODEV;
+
+	count = sizeof(cam->sysfs.frame_header);
+	memcpy(buf, cam->sysfs.frame_header, count);
+
+	DBG(3, "Frame header, read bytes: %zd", count);
+
+	return count;
+}
+
+
+static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
+			 sn9c102_show_reg, sn9c102_store_reg);
+static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
+			 sn9c102_show_val, sn9c102_store_val);
+static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
+			 sn9c102_show_i2c_reg, sn9c102_store_i2c_reg);
+static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
+			 sn9c102_show_i2c_val, sn9c102_store_i2c_val);
+static CLASS_DEVICE_ATTR(green, S_IWUGO, NULL, sn9c102_store_green);
+static CLASS_DEVICE_ATTR(blue, S_IWUGO, NULL, sn9c102_store_blue);
+static CLASS_DEVICE_ATTR(red, S_IWUGO, NULL, sn9c102_store_red);
+static CLASS_DEVICE_ATTR(frame_header, S_IRUGO,
+			 sn9c102_show_frame_header, NULL);
+
+
+static void sn9c102_create_sysfs(struct sn9c102_device* cam)
+{
+	struct video_device *v4ldev = cam->v4ldev;
+
+	video_device_create_file(v4ldev, &class_device_attr_reg);
+	video_device_create_file(v4ldev, &class_device_attr_val);
+	video_device_create_file(v4ldev, &class_device_attr_frame_header);
+	if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
+		video_device_create_file(v4ldev, &class_device_attr_green);
+	else if (cam->bridge == BRIDGE_SN9C103) {
+		video_device_create_file(v4ldev, &class_device_attr_blue);
+		video_device_create_file(v4ldev, &class_device_attr_red);
+	}
+	if (cam->sensor.sysfs_ops) {
+		video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
+		video_device_create_file(v4ldev, &class_device_attr_i2c_val);
+	}
+}
+#endif /* CONFIG_VIDEO_ADV_DEBUG */
+
+/*****************************************************************************/
+
+static int
+sn9c102_set_pix_format(struct sn9c102_device* cam, struct v4l2_pix_format* pix)
+{
+	int err = 0;
+
+	if (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
+		err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80, 0x18);
+	else
+		err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f, 0x18);
+
+	return err ? -EIO : 0;
+}
+
+
+static int
+sn9c102_set_compression(struct sn9c102_device* cam,
+			struct v4l2_jpegcompression* compression)
+{
+	int err = 0;
+
+	if (compression->quality == 0)
+		err += sn9c102_write_reg(cam, cam->reg[0x17] | 0x01, 0x17);
+	else if (compression->quality == 1)
+		err += sn9c102_write_reg(cam, cam->reg[0x17] & 0xfe, 0x17);
+
+	return err ? -EIO : 0;
+}
+
+
+static int sn9c102_set_scale(struct sn9c102_device* cam, u8 scale)
+{
+	u8 r = 0;
+	int err = 0;
+
+	if (scale == 1)
+		r = cam->reg[0x18] & 0xcf;
+	else if (scale == 2) {
+		r = cam->reg[0x18] & 0xcf;
+		r |= 0x10;
+	} else if (scale == 4)
+		r = cam->reg[0x18] | 0x20;
+
+	err += sn9c102_write_reg(cam, r, 0x18);
+	if (err)
+		return -EIO;
+
+	PDBGG("Scaling factor: %u", scale);
+
+	return 0;
+}
+
+
+static int sn9c102_set_crop(struct sn9c102_device* cam, struct v4l2_rect* rect)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	u8 h_start = (u8)(rect->left - s->cropcap.bounds.left),
+	   v_start = (u8)(rect->top - s->cropcap.bounds.top),
+	   h_size = (u8)(rect->width / 16),
+	   v_size = (u8)(rect->height / 16);
+	int err = 0;
+
+	err += sn9c102_write_reg(cam, h_start, 0x12);
+	err += sn9c102_write_reg(cam, v_start, 0x13);
+	err += sn9c102_write_reg(cam, h_size, 0x15);
+	err += sn9c102_write_reg(cam, v_size, 0x16);
+	if (err)
+		return -EIO;
+
+	PDBGG("h_start, v_start, h_size, v_size, ho_size, vo_size "
+	      "%u %u %u %u", h_start, v_start, h_size, v_size);
+
+	return 0;
+}
+
+
+static int sn9c102_init(struct sn9c102_device* cam)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	struct v4l2_control ctrl;
+	struct v4l2_queryctrl *qctrl;
+	struct v4l2_rect* rect;
+	u8 i = 0;
+	int err = 0;
+
+	if (!(cam->state & DEV_INITIALIZED)) {
+		init_waitqueue_head(&cam->open);
+		qctrl = s->qctrl;
+		rect = &(s->cropcap.defrect);
+	} else { /* use current values */
+		qctrl = s->_qctrl;
+		rect = &(s->_rect);
+	}
+
+	err += sn9c102_set_scale(cam, rect->width / s->pix_format.width);
+	err += sn9c102_set_crop(cam, rect);
+	if (err)
+		return err;
+
+	if (s->init) {
+		err = s->init(cam);
+		if (err) {
+			DBG(3, "Sensor initialization failed");
+			return err;
+		}
+	}
+
+	if (!(cam->state & DEV_INITIALIZED))
+		cam->compression.quality =  cam->reg[0x17] & 0x01 ? 0 : 1;
+	else
+		err += sn9c102_set_compression(cam, &cam->compression);
+	err += sn9c102_set_pix_format(cam, &s->pix_format);
+	if (s->set_pix_format)
+		err += s->set_pix_format(cam, &s->pix_format);
+	if (err)
+		return err;
+
+	if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
+		DBG(3, "Compressed video format is active, quality %d",
+		    cam->compression.quality);
+	else
+		DBG(3, "Uncompressed video format is active");
+
+	if (s->set_crop)
+		if ((err = s->set_crop(cam, rect))) {
+			DBG(3, "set_crop() failed");
+			return err;
+		}
+
+	if (s->set_ctrl) {
+		for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
+			if (s->qctrl[i].id != 0 &&
+			    !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
+				ctrl.id = s->qctrl[i].id;
+				ctrl.value = qctrl[i].default_value;
+				err = s->set_ctrl(cam, &ctrl);
+				if (err) {
+					DBG(3, "Set %s control failed",
+					    s->qctrl[i].name);
+					return err;
+				}
+				DBG(3, "Image sensor supports '%s' control",
+				    s->qctrl[i].name);
+			}
+	}
+
+	if (!(cam->state & DEV_INITIALIZED)) {
+		mutex_init(&cam->fileop_mutex);
+		spin_lock_init(&cam->queue_lock);
+		init_waitqueue_head(&cam->wait_frame);
+		init_waitqueue_head(&cam->wait_stream);
+		cam->nreadbuffers = 2;
+		memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
+		memcpy(&(s->_rect), &(s->cropcap.defrect),
+		       sizeof(struct v4l2_rect));
+		cam->state |= DEV_INITIALIZED;
+	}
+
+	DBG(2, "Initialization succeeded");
+	return 0;
+}
+
+
+static void sn9c102_release_resources(struct sn9c102_device* cam)
+{
+	mutex_lock(&sn9c102_sysfs_lock);
+
+	DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
+	video_set_drvdata(cam->v4ldev, NULL);
+	video_unregister_device(cam->v4ldev);
+
+	usb_put_dev(cam->usbdev);
+
+	mutex_unlock(&sn9c102_sysfs_lock);
+
+	kfree(cam->control_buffer);
+}
+
+/*****************************************************************************/
+
+static int sn9c102_open(struct inode* inode, struct file* filp)
+{
+	struct sn9c102_device* cam;
+	int err = 0;
+
+	/*
+	   This is the only safe way to prevent race conditions with
+	   disconnect
+	*/
+	if (!down_read_trylock(&sn9c102_disconnect))
+		return -ERESTARTSYS;
+
+	cam = video_get_drvdata(video_devdata(filp));
+
+	if (mutex_lock_interruptible(&cam->dev_mutex)) {
+		up_read(&sn9c102_disconnect);
+		return -ERESTARTSYS;
+	}
+
+	if (cam->users) {
+		DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
+		if ((filp->f_flags & O_NONBLOCK) ||
+		    (filp->f_flags & O_NDELAY)) {
+			err = -EWOULDBLOCK;
+			goto out;
+		}
+		mutex_unlock(&cam->dev_mutex);
+		err = wait_event_interruptible_exclusive(cam->open,
+						  cam->state & DEV_DISCONNECTED
+							 || !cam->users);
+		if (err) {
+			up_read(&sn9c102_disconnect);
+			return err;
+		}
+		if (cam->state & DEV_DISCONNECTED) {
+			up_read(&sn9c102_disconnect);
+			return -ENODEV;
+		}
+		mutex_lock(&cam->dev_mutex);
+	}
+
+
+	if (cam->state & DEV_MISCONFIGURED) {
+		err = sn9c102_init(cam);
+		if (err) {
+			DBG(1, "Initialization failed again. "
+			       "I will retry on next open().");
+			goto out;
+		}
+		cam->state &= ~DEV_MISCONFIGURED;
+	}
+
+	if ((err = sn9c102_start_transfer(cam)))
+		goto out;
+
+	filp->private_data = cam;
+	cam->users++;
+	cam->io = IO_NONE;
+	cam->stream = STREAM_OFF;
+	cam->nbuffers = 0;
+	cam->frame_count = 0;
+	sn9c102_empty_framequeues(cam);
+
+	DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
+
+out:
+	mutex_unlock(&cam->dev_mutex);
+	up_read(&sn9c102_disconnect);
+	return err;
+}
+
+
+static int sn9c102_release(struct inode* inode, struct file* filp)
+{
+	struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
+
+	mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
+
+	sn9c102_stop_transfer(cam);
+
+	sn9c102_release_buffers(cam);
+
+	if (cam->state & DEV_DISCONNECTED) {
+		sn9c102_release_resources(cam);
+		mutex_unlock(&cam->dev_mutex);
+		kfree(cam);
+		return 0;
+	}
+
+	cam->users--;
+	wake_up_interruptible_nr(&cam->open, 1);
+
+	DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
+
+	mutex_unlock(&cam->dev_mutex);
+
+	return 0;
+}
+
+
+static ssize_t
+sn9c102_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
+{
+	struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
+	struct sn9c102_frame_t* f, * i;
+	unsigned long lock_flags;
+	long timeout;
+	int err = 0;
+
+	if (mutex_lock_interruptible(&cam->fileop_mutex))
+		return -ERESTARTSYS;
+
+	if (cam->state & DEV_DISCONNECTED) {
+		DBG(1, "Device not present");
+		mutex_unlock(&cam->fileop_mutex);
+		return -ENODEV;
+	}
+
+	if (cam->state & DEV_MISCONFIGURED) {
+		DBG(1, "The camera is misconfigured. Close and open it "
+		       "again.");
+		mutex_unlock(&cam->fileop_mutex);
+		return -EIO;
+	}
+
+	if (cam->io == IO_MMAP) {
+		DBG(3, "Close and open the device again to choose "
+		       "the read method");
+		mutex_unlock(&cam->fileop_mutex);
+		return -EINVAL;
+	}
+
+	if (cam->io == IO_NONE) {
+		if (!sn9c102_request_buffers(cam,cam->nreadbuffers, IO_READ)) {
+			DBG(1, "read() failed, not enough memory");
+			mutex_unlock(&cam->fileop_mutex);
+			return -ENOMEM;
+		}
+		cam->io = IO_READ;
+		cam->stream = STREAM_ON;
+	}
+
+	if (list_empty(&cam->inqueue)) {
+		if (!list_empty(&cam->outqueue))
+			sn9c102_empty_framequeues(cam);
+		sn9c102_queue_unusedframes(cam);
+	}
+
+	if (!count) {
+		mutex_unlock(&cam->fileop_mutex);
+		return 0;
+	}
+
+	if (list_empty(&cam->outqueue)) {
+		if (filp->f_flags & O_NONBLOCK) {
+			mutex_unlock(&cam->fileop_mutex);
+			return -EAGAIN;
+		}
+		timeout = wait_event_interruptible_timeout
+			  ( cam->wait_frame,
+			    (!list_empty(&cam->outqueue)) ||
+			    (cam->state & DEV_DISCONNECTED) ||
+			    (cam->state & DEV_MISCONFIGURED),
+			    cam->module_param.frame_timeout *
+			    1000 * msecs_to_jiffies(1) );
+		if (timeout < 0) {
+			mutex_unlock(&cam->fileop_mutex);
+			return timeout;
+		}
+		if (cam->state & DEV_DISCONNECTED) {
+			mutex_unlock(&cam->fileop_mutex);
+			return -ENODEV;
+		}
+		if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
+			mutex_unlock(&cam->fileop_mutex);
+			return -EIO;
+		}
+	}
+
+	f = list_entry(cam->outqueue.prev, struct sn9c102_frame_t, frame);
+
+	if (count > f->buf.bytesused)
+		count = f->buf.bytesused;
+
+	if (copy_to_user(buf, f->bufmem, count)) {
+		err = -EFAULT;
+		goto exit;
+	}
+	*f_pos += count;
+
+exit:
+	spin_lock_irqsave(&cam->queue_lock, lock_flags);
+	list_for_each_entry(i, &cam->outqueue, frame)
+		i->state = F_UNUSED;
+	INIT_LIST_HEAD(&cam->outqueue);
+	spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
+
+	sn9c102_queue_unusedframes(cam);
+
+	PDBGG("Frame #%lu, bytes read: %zu",
+	      (unsigned long)f->buf.index, count);
+
+	mutex_unlock(&cam->fileop_mutex);
+
+	return count;
+}
+
+
+static unsigned int sn9c102_poll(struct file *filp, poll_table *wait)
+{
+	struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
+	struct sn9c102_frame_t* f;
+	unsigned long lock_flags;
+	unsigned int mask = 0;
+
+	if (mutex_lock_interruptible(&cam->fileop_mutex))
+		return POLLERR;
+
+	if (cam->state & DEV_DISCONNECTED) {
+		DBG(1, "Device not present");
+		goto error;
+	}
+
+	if (cam->state & DEV_MISCONFIGURED) {
+		DBG(1, "The camera is misconfigured. Close and open it "
+		       "again.");
+		goto error;
+	}
+
+	if (cam->io == IO_NONE) {
+		if (!sn9c102_request_buffers(cam, cam->nreadbuffers,
+					     IO_READ)) {
+			DBG(1, "poll() failed, not enough memory");
+			goto error;
+		}
+		cam->io = IO_READ;
+		cam->stream = STREAM_ON;
+	}
+
+	if (cam->io == IO_READ) {
+		spin_lock_irqsave(&cam->queue_lock, lock_flags);
+		list_for_each_entry(f, &cam->outqueue, frame)
+			f->state = F_UNUSED;
+		INIT_LIST_HEAD(&cam->outqueue);
+		spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
+		sn9c102_queue_unusedframes(cam);
+	}
+
+	poll_wait(filp, &cam->wait_frame, wait);
+
+	if (!list_empty(&cam->outqueue))
+		mask |= POLLIN | POLLRDNORM;
+
+	mutex_unlock(&cam->fileop_mutex);
+
+	return mask;
+
+error:
+	mutex_unlock(&cam->fileop_mutex);
+	return POLLERR;
+}
+
+
+static void sn9c102_vm_open(struct vm_area_struct* vma)
+{
+	struct sn9c102_frame_t* f = vma->vm_private_data;
+	f->vma_use_count++;
+}
+
+
+static void sn9c102_vm_close(struct vm_area_struct* vma)
+{
+	/* NOTE: buffers are not freed here */
+	struct sn9c102_frame_t* f = vma->vm_private_data;
+	f->vma_use_count--;
+}
+
+
+static struct vm_operations_struct sn9c102_vm_ops = {
+	.open = sn9c102_vm_open,
+	.close = sn9c102_vm_close,
+};
+
+
+static int sn9c102_mmap(struct file* filp, struct vm_area_struct *vma)
+{
+	struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
+	unsigned long size = vma->vm_end - vma->vm_start,
+		      start = vma->vm_start;
+	void *pos;
+	u32 i;
+
+	if (mutex_lock_interruptible(&cam->fileop_mutex))
+		return -ERESTARTSYS;
+
+	if (cam->state & DEV_DISCONNECTED) {
+		DBG(1, "Device not present");
+		mutex_unlock(&cam->fileop_mutex);
+		return -ENODEV;
+	}
+
+	if (cam->state & DEV_MISCONFIGURED) {
+		DBG(1, "The camera is misconfigured. Close and open it "
+		       "again.");
+		mutex_unlock(&cam->fileop_mutex);
+		return -EIO;
+	}
+
+	if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
+	    size != PAGE_ALIGN(cam->frame[0].buf.length)) {
+		mutex_unlock(&cam->fileop_mutex);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < cam->nbuffers; i++) {
+		if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
+			break;
+	}
+	if (i == cam->nbuffers) {
+		mutex_unlock(&cam->fileop_mutex);
+		return -EINVAL;
+	}
+
+	vma->vm_flags |= VM_IO;
+	vma->vm_flags |= VM_RESERVED;
+
+	pos = cam->frame[i].bufmem;
+	while (size > 0) { /* size is page-aligned */
+		if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
+			mutex_unlock(&cam->fileop_mutex);
+			return -EAGAIN;
+		}
+		start += PAGE_SIZE;
+		pos += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
+
+	vma->vm_ops = &sn9c102_vm_ops;
+	vma->vm_private_data = &cam->frame[i];
+
+	sn9c102_vm_open(vma);
+
+	mutex_unlock(&cam->fileop_mutex);
+
+	return 0;
+}
+
+/*****************************************************************************/
+
+static int
+sn9c102_vidioc_querycap(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_capability cap = {
+		.driver = "sn9c102",
+		.version = SN9C102_MODULE_VERSION_CODE,
+		.capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
+				V4L2_CAP_STREAMING,
+	};
+
+	strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
+	if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
+		strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
+			sizeof(cap.bus_info));
+
+	if (copy_to_user(arg, &cap, sizeof(cap)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_enuminput(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_input i;
+
+	if (copy_from_user(&i, arg, sizeof(i)))
+		return -EFAULT;
+
+	if (i.index)
+		return -EINVAL;
+
+	memset(&i, 0, sizeof(i));
+	strcpy(i.name, "Camera");
+	i.type = V4L2_INPUT_TYPE_CAMERA;
+
+	if (copy_to_user(arg, &i, sizeof(i)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_g_input(struct sn9c102_device* cam, void __user * arg)
+{
+	int index = 0;
+
+	if (copy_to_user(arg, &index, sizeof(index)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_s_input(struct sn9c102_device* cam, void __user * arg)
+{
+	int index;
+
+	if (copy_from_user(&index, arg, sizeof(index)))
+		return -EFAULT;
+
+	if (index != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_query_ctrl(struct sn9c102_device* cam, void __user * arg)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	struct v4l2_queryctrl qc;
+	u8 i;
+
+	if (copy_from_user(&qc, arg, sizeof(qc)))
+		return -EFAULT;
+
+	for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
+		if (qc.id && qc.id == s->qctrl[i].id) {
+			memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
+			if (copy_to_user(arg, &qc, sizeof(qc)))
+				return -EFAULT;
+			return 0;
+		}
+
+	return -EINVAL;
+}
+
+
+static int
+sn9c102_vidioc_g_ctrl(struct sn9c102_device* cam, void __user * arg)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	struct v4l2_control ctrl;
+	int err = 0;
+	u8 i;
+
+	if (!s->get_ctrl && !s->set_ctrl)
+		return -EINVAL;
+
+	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
+		return -EFAULT;
+
+	if (!s->get_ctrl) {
+		for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
+			if (ctrl.id && ctrl.id == s->qctrl[i].id) {
+				ctrl.value = s->_qctrl[i].default_value;
+				goto exit;
+			}
+		return -EINVAL;
+	} else
+		err = s->get_ctrl(cam, &ctrl);
+
+exit:
+	if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
+		return -EFAULT;
+
+	return err;
+}
+
+
+static int
+sn9c102_vidioc_s_ctrl(struct sn9c102_device* cam, void __user * arg)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	struct v4l2_control ctrl;
+	u8 i;
+	int err = 0;
+
+	if (!s->set_ctrl)
+		return -EINVAL;
+
+	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
+		return -EFAULT;
+
+	for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
+		if (ctrl.id == s->qctrl[i].id) {
+			if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
+				return -EINVAL;
+			if (ctrl.value < s->qctrl[i].minimum ||
+			    ctrl.value > s->qctrl[i].maximum)
+				return -ERANGE;
+			ctrl.value -= ctrl.value % s->qctrl[i].step;
+			break;
+		}
+
+	if ((err = s->set_ctrl(cam, &ctrl)))
+		return err;
+
+	s->_qctrl[i].default_value = ctrl.value;
+
+	PDBGG("VIDIOC_S_CTRL: id %lu, value %lu",
+	      (unsigned long)ctrl.id, (unsigned long)ctrl.value);
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_cropcap(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
+
+	cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	cc->pixelaspect.numerator = 1;
+	cc->pixelaspect.denominator = 1;
+
+	if (copy_to_user(arg, cc, sizeof(*cc)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_g_crop(struct sn9c102_device* cam, void __user * arg)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	struct v4l2_crop crop = {
+		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+	};
+
+	memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
+
+	if (copy_to_user(arg, &crop, sizeof(crop)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_s_crop(struct sn9c102_device* cam, void __user * arg)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	struct v4l2_crop crop;
+	struct v4l2_rect* rect;
+	struct v4l2_rect* bounds = &(s->cropcap.bounds);
+	struct v4l2_pix_format* pix_format = &(s->pix_format);
+	u8 scale;
+	const enum sn9c102_stream_state stream = cam->stream;
+	const u32 nbuffers = cam->nbuffers;
+	u32 i;
+	int err = 0;
+
+	if (copy_from_user(&crop, arg, sizeof(crop)))
+		return -EFAULT;
+
+	rect = &(crop.c);
+
+	if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (cam->module_param.force_munmap)
+		for (i = 0; i < cam->nbuffers; i++)
+			if (cam->frame[i].vma_use_count) {
+				DBG(3, "VIDIOC_S_CROP failed. "
+				       "Unmap the buffers first.");
+				return -EINVAL;
+			}
+
+	/* Preserve R,G or B origin */
+	rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
+	rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
+
+	if (rect->width < 16)
+		rect->width = 16;
+	if (rect->height < 16)
+		rect->height = 16;
+	if (rect->width > bounds->width)
+		rect->width = bounds->width;
+	if (rect->height > bounds->height)
+		rect->height = bounds->height;
+	if (rect->left < bounds->left)
+		rect->left = bounds->left;
+	if (rect->top < bounds->top)
+		rect->top = bounds->top;
+	if (rect->left + rect->width > bounds->left + bounds->width)
+		rect->left = bounds->left+bounds->width - rect->width;
+	if (rect->top + rect->height > bounds->top + bounds->height)
+		rect->top = bounds->top+bounds->height - rect->height;
+
+	rect->width &= ~15L;
+	rect->height &= ~15L;
+
+	if (SN9C102_PRESERVE_IMGSCALE) {
+		/* Calculate the actual scaling factor */
+		u32 a, b;
+		a = rect->width * rect->height;
+		b = pix_format->width * pix_format->height;
+		scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
+	} else
+		scale = 1;
+
+	if (cam->stream == STREAM_ON)
+		if ((err = sn9c102_stream_interrupt(cam)))
+			return err;
+
+	if (copy_to_user(arg, &crop, sizeof(crop))) {
+		cam->stream = stream;
+		return -EFAULT;
+	}
+
+	if (cam->module_param.force_munmap || cam->io == IO_READ)
+		sn9c102_release_buffers(cam);
+
+	err = sn9c102_set_crop(cam, rect);
+	if (s->set_crop)
+		err += s->set_crop(cam, rect);
+	err += sn9c102_set_scale(cam, scale);
+
+	if (err) { /* atomic, no rollback in ioctl() */
+		cam->state |= DEV_MISCONFIGURED;
+		DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
+		       "use the camera, close and open /dev/video%d again.",
+		    cam->v4ldev->minor);
+		return -EIO;
+	}
+
+	s->pix_format.width = rect->width/scale;
+	s->pix_format.height = rect->height/scale;
+	memcpy(&(s->_rect), rect, sizeof(*rect));
+
+	if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
+	    nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
+		cam->state |= DEV_MISCONFIGURED;
+		DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
+		       "use the camera, close and open /dev/video%d again.",
+		    cam->v4ldev->minor);
+		return -ENOMEM;
+	}
+
+	if (cam->io == IO_READ)
+		sn9c102_empty_framequeues(cam);
+	else if (cam->module_param.force_munmap)
+		sn9c102_requeue_outqueue(cam);
+
+	cam->stream = stream;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_enum_fmt(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_fmtdesc fmtd;
+
+	if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
+		return -EFAULT;
+
+	if (fmtd.index == 0) {
+		strcpy(fmtd.description, "bayer rgb");
+		fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
+	} else if (fmtd.index == 1) {
+		strcpy(fmtd.description, "compressed");
+		fmtd.pixelformat = V4L2_PIX_FMT_SN9C10X;
+		fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
+	} else
+		return -EINVAL;
+
+	fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
+
+	if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_g_fmt(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_format format;
+	struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
+
+	if (copy_from_user(&format, arg, sizeof(format)))
+		return -EFAULT;
+
+	if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_SN9C10X)
+			     ? 0 : (pfmt->width * pfmt->priv) / 8;
+	pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
+	pfmt->field = V4L2_FIELD_NONE;
+	memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
+
+	if (copy_to_user(arg, &format, sizeof(format)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_try_s_fmt(struct sn9c102_device* cam, unsigned int cmd,
+			 void __user * arg)
+{
+	struct sn9c102_sensor* s = &cam->sensor;
+	struct v4l2_format format;
+	struct v4l2_pix_format* pix;
+	struct v4l2_pix_format* pfmt = &(s->pix_format);
+	struct v4l2_rect* bounds = &(s->cropcap.bounds);
+	struct v4l2_rect rect;
+	u8 scale;
+	const enum sn9c102_stream_state stream = cam->stream;
+	const u32 nbuffers = cam->nbuffers;
+	u32 i;
+	int err = 0;
+
+	if (copy_from_user(&format, arg, sizeof(format)))
+		return -EFAULT;
+
+	pix = &(format.fmt.pix);
+
+	if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	memcpy(&rect, &(s->_rect), sizeof(rect));
+
+	{ /* calculate the actual scaling factor */
+		u32 a, b;
+		a = rect.width * rect.height;
+		b = pix->width * pix->height;
+		scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
+	}
+
+	rect.width = scale * pix->width;
+	rect.height = scale * pix->height;
+
+	if (rect.width < 16)
+		rect.width = 16;
+	if (rect.height < 16)
+		rect.height = 16;
+	if (rect.width > bounds->left + bounds->width - rect.left)
+		rect.width = bounds->left + bounds->width - rect.left;
+	if (rect.height > bounds->top + bounds->height - rect.top)
+		rect.height = bounds->top + bounds->height - rect.top;
+
+	rect.width &= ~15L;
+	rect.height &= ~15L;
+
+	{ /* adjust the scaling factor */
+		u32 a, b;
+		a = rect.width * rect.height;
+		b = pix->width * pix->height;
+		scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
+	}
+
+	pix->width = rect.width / scale;
+	pix->height = rect.height / scale;
+
+	if (pix->pixelformat != V4L2_PIX_FMT_SN9C10X &&
+	    pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
+		pix->pixelformat = pfmt->pixelformat;
+	pix->priv = pfmt->priv; /* bpp */
+	pix->colorspace = pfmt->colorspace;
+	pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
+			    ? 0 : (pix->width * pix->priv) / 8;
+	pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
+	pix->field = V4L2_FIELD_NONE;
+
+	if (cmd == VIDIOC_TRY_FMT) {
+		if (copy_to_user(arg, &format, sizeof(format)))
+			return -EFAULT;
+		return 0;
+	}
+
+	if (cam->module_param.force_munmap)
+		for (i = 0; i < cam->nbuffers; i++)
+			if (cam->frame[i].vma_use_count) {
+				DBG(3, "VIDIOC_S_FMT failed. Unmap the "
+				       "buffers first.");
+				return -EINVAL;
+			}
+
+	if (cam->stream == STREAM_ON)
+		if ((err = sn9c102_stream_interrupt(cam)))
+			return err;
+
+	if (copy_to_user(arg, &format, sizeof(format))) {
+		cam->stream = stream;
+		return -EFAULT;
+	}
+
+	if (cam->module_param.force_munmap  || cam->io == IO_READ)
+		sn9c102_release_buffers(cam);
+
+	err += sn9c102_set_pix_format(cam, pix);
+	err += sn9c102_set_crop(cam, &rect);
+	if (s->set_pix_format)
+		err += s->set_pix_format(cam, pix);
+	if (s->set_crop)
+		err += s->set_crop(cam, &rect);
+	err += sn9c102_set_scale(cam, scale);
+
+	if (err) { /* atomic, no rollback in ioctl() */
+		cam->state |= DEV_MISCONFIGURED;
+		DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
+		       "use the camera, close and open /dev/video%d again.",
+		    cam->v4ldev->minor);
+		return -EIO;
+	}
+
+	memcpy(pfmt, pix, sizeof(*pix));
+	memcpy(&(s->_rect), &rect, sizeof(rect));
+
+	if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
+	    nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
+		cam->state |= DEV_MISCONFIGURED;
+		DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
+		       "use the camera, close and open /dev/video%d again.",
+		    cam->v4ldev->minor);
+		return -ENOMEM;
+	}
+
+	if (cam->io == IO_READ)
+		sn9c102_empty_framequeues(cam);
+	else if (cam->module_param.force_munmap)
+		sn9c102_requeue_outqueue(cam);
+
+	cam->stream = stream;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_g_jpegcomp(struct sn9c102_device* cam, void __user * arg)
+{
+	if (copy_to_user(arg, &cam->compression,
+			 sizeof(cam->compression)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_s_jpegcomp(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_jpegcompression jc;
+	const enum sn9c102_stream_state stream = cam->stream;
+	int err = 0;
+
+	if (copy_from_user(&jc, arg, sizeof(jc)))
+		return -EFAULT;
+
+	if (jc.quality != 0 && jc.quality != 1)
+		return -EINVAL;
+
+	if (cam->stream == STREAM_ON)
+		if ((err = sn9c102_stream_interrupt(cam)))
+			return err;
+
+	err += sn9c102_set_compression(cam, &jc);
+	if (err) { /* atomic, no rollback in ioctl() */
+		cam->state |= DEV_MISCONFIGURED;
+		DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
+		       "problems. To use the camera, close and open "
+		       "/dev/video%d again.", cam->v4ldev->minor);
+		return -EIO;
+	}
+
+	cam->compression.quality = jc.quality;
+
+	cam->stream = stream;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_reqbufs(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_requestbuffers rb;
+	u32 i;
+	int err;
+
+	if (copy_from_user(&rb, arg, sizeof(rb)))
+		return -EFAULT;
+
+	if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	    rb.memory != V4L2_MEMORY_MMAP)
+		return -EINVAL;
+
+	if (cam->io == IO_READ) {
+		DBG(3, "Close and open the device again to choose the mmap "
+		       "I/O method");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < cam->nbuffers; i++)
+		if (cam->frame[i].vma_use_count) {
+			DBG(3, "VIDIOC_REQBUFS failed. Previous buffers are "
+			       "still mapped.");
+			return -EINVAL;
+		}
+
+	if (cam->stream == STREAM_ON)
+		if ((err = sn9c102_stream_interrupt(cam)))
+			return err;
+
+	sn9c102_empty_framequeues(cam);
+
+	sn9c102_release_buffers(cam);
+	if (rb.count)
+		rb.count = sn9c102_request_buffers(cam, rb.count, IO_MMAP);
+
+	if (copy_to_user(arg, &rb, sizeof(rb))) {
+		sn9c102_release_buffers(cam);
+		cam->io = IO_NONE;
+		return -EFAULT;
+	}
+
+	cam->io = rb.count ? IO_MMAP : IO_NONE;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_querybuf(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_buffer b;
+
+	if (copy_from_user(&b, arg, sizeof(b)))
+		return -EFAULT;
+
+	if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	    b.index >= cam->nbuffers || cam->io != IO_MMAP)
+		return -EINVAL;
+
+	memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
+
+	if (cam->frame[b.index].vma_use_count)
+		b.flags |= V4L2_BUF_FLAG_MAPPED;
+
+	if (cam->frame[b.index].state == F_DONE)
+		b.flags |= V4L2_BUF_FLAG_DONE;
+	else if (cam->frame[b.index].state != F_UNUSED)
+		b.flags |= V4L2_BUF_FLAG_QUEUED;
+
+	if (copy_to_user(arg, &b, sizeof(b)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_qbuf(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_buffer b;
+	unsigned long lock_flags;
+
+	if (copy_from_user(&b, arg, sizeof(b)))
+		return -EFAULT;
+
+	if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	    b.index >= cam->nbuffers || cam->io != IO_MMAP)
+		return -EINVAL;
+
+	if (cam->frame[b.index].state != F_UNUSED)
+		return -EINVAL;
+
+	cam->frame[b.index].state = F_QUEUED;
+
+	spin_lock_irqsave(&cam->queue_lock, lock_flags);
+	list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
+	spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
+
+	PDBGG("Frame #%lu queued", (unsigned long)b.index);
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_dqbuf(struct sn9c102_device* cam, struct file* filp,
+		     void __user * arg)
+{
+	struct v4l2_buffer b;
+	struct sn9c102_frame_t *f;
+	unsigned long lock_flags;
+	long timeout;
+
+	if (copy_from_user(&b, arg, sizeof(b)))
+		return -EFAULT;
+
+	if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
+		return -EINVAL;
+
+	if (list_empty(&cam->outqueue)) {
+		if (cam->stream == STREAM_OFF)
+			return -EINVAL;
+		if (filp->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+		timeout = wait_event_interruptible_timeout
+			  ( cam->wait_frame,
+			    (!list_empty(&cam->outqueue)) ||
+			    (cam->state & DEV_DISCONNECTED) ||
+			    (cam->state & DEV_MISCONFIGURED),
+			    cam->module_param.frame_timeout *
+			    1000 * msecs_to_jiffies(1) );
+		if (timeout < 0)
+			return timeout;
+		if (cam->state & DEV_DISCONNECTED)
+			return -ENODEV;
+		if (!timeout || (cam->state & DEV_MISCONFIGURED))
+			return -EIO;
+	}
+
+	spin_lock_irqsave(&cam->queue_lock, lock_flags);
+	f = list_entry(cam->outqueue.next, struct sn9c102_frame_t, frame);
+	list_del(cam->outqueue.next);
+	spin_unlock_irqrestore(&cam->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;
+
+	if (copy_to_user(arg, &b, sizeof(b)))
+		return -EFAULT;
+
+	PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_streamon(struct sn9c102_device* cam, void __user * arg)
+{
+	int type;
+
+	if (copy_from_user(&type, arg, sizeof(type)))
+		return -EFAULT;
+
+	if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
+		return -EINVAL;
+
+	if (list_empty(&cam->inqueue))
+		return -EINVAL;
+
+	cam->stream = STREAM_ON;
+
+	DBG(3, "Stream on");
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_streamoff(struct sn9c102_device* cam, void __user * arg)
+{
+	int type, err;
+
+	if (copy_from_user(&type, arg, sizeof(type)))
+		return -EFAULT;
+
+	if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
+		return -EINVAL;
+
+	if (cam->stream == STREAM_ON)
+		if ((err = sn9c102_stream_interrupt(cam)))
+			return err;
+
+	sn9c102_empty_framequeues(cam);
+
+	DBG(3, "Stream off");
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_g_parm(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_streamparm sp;
+
+	if (copy_from_user(&sp, arg, sizeof(sp)))
+		return -EFAULT;
+
+	if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	sp.parm.capture.extendedmode = 0;
+	sp.parm.capture.readbuffers = cam->nreadbuffers;
+
+	if (copy_to_user(arg, &sp, sizeof(sp)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+sn9c102_vidioc_s_parm(struct sn9c102_device* cam, void __user * arg)
+{
+	struct v4l2_streamparm sp;
+
+	if (copy_from_user(&sp, arg, sizeof(sp)))
+		return -EFAULT;
+
+	if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	sp.parm.capture.extendedmode = 0;
+
+	if (sp.parm.capture.readbuffers == 0)
+		sp.parm.capture.readbuffers = cam->nreadbuffers;
+
+	if (sp.parm.capture.readbuffers > SN9C102_MAX_FRAMES)
+		sp.parm.capture.readbuffers = SN9C102_MAX_FRAMES;
+
+	if (copy_to_user(arg, &sp, sizeof(sp)))
+		return -EFAULT;
+
+	cam->nreadbuffers = sp.parm.capture.readbuffers;
+
+	return 0;
+}
+
+
+static int sn9c102_ioctl_v4l2(struct inode* inode, struct file* filp,
+			      unsigned int cmd, void __user * arg)
+{
+	struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
+
+	switch (cmd) {
+
+	case VIDIOC_QUERYCAP:
+		return sn9c102_vidioc_querycap(cam, arg);
+
+	case VIDIOC_ENUMINPUT:
+		return sn9c102_vidioc_enuminput(cam, arg);
+
+	case VIDIOC_G_INPUT:
+		return sn9c102_vidioc_g_input(cam, arg);
+
+	case VIDIOC_S_INPUT:
+		return sn9c102_vidioc_s_input(cam, arg);
+
+	case VIDIOC_QUERYCTRL:
+		return sn9c102_vidioc_query_ctrl(cam, arg);
+
+	case VIDIOC_G_CTRL:
+		return sn9c102_vidioc_g_ctrl(cam, arg);
+
+	case VIDIOC_S_CTRL_OLD:
+	case VIDIOC_S_CTRL:
+		return sn9c102_vidioc_s_ctrl(cam, arg);
+
+	case VIDIOC_CROPCAP_OLD:
+	case VIDIOC_CROPCAP:
+		return sn9c102_vidioc_cropcap(cam, arg);
+
+	case VIDIOC_G_CROP:
+		return sn9c102_vidioc_g_crop(cam, arg);
+
+	case VIDIOC_S_CROP:
+		return sn9c102_vidioc_s_crop(cam, arg);
+
+	case VIDIOC_ENUM_FMT:
+		return sn9c102_vidioc_enum_fmt(cam, arg);
+
+	case VIDIOC_G_FMT:
+		return sn9c102_vidioc_g_fmt(cam, arg);
+
+	case VIDIOC_TRY_FMT:
+	case VIDIOC_S_FMT:
+		return sn9c102_vidioc_try_s_fmt(cam, cmd, arg);
+
+	case VIDIOC_G_JPEGCOMP:
+		return sn9c102_vidioc_g_jpegcomp(cam, arg);
+
+	case VIDIOC_S_JPEGCOMP:
+		return sn9c102_vidioc_s_jpegcomp(cam, arg);
+
+	case VIDIOC_REQBUFS:
+		return sn9c102_vidioc_reqbufs(cam, arg);
+
+	case VIDIOC_QUERYBUF:
+		return sn9c102_vidioc_querybuf(cam, arg);
+
+	case VIDIOC_QBUF:
+		return sn9c102_vidioc_qbuf(cam, arg);
+
+	case VIDIOC_DQBUF:
+		return sn9c102_vidioc_dqbuf(cam, filp, arg);
+
+	case VIDIOC_STREAMON:
+		return sn9c102_vidioc_streamon(cam, arg);
+
+	case VIDIOC_STREAMOFF:
+		return sn9c102_vidioc_streamoff(cam, arg);
+
+	case VIDIOC_G_PARM:
+		return sn9c102_vidioc_g_parm(cam, arg);
+
+	case VIDIOC_S_PARM_OLD:
+	case VIDIOC_S_PARM:
+		return sn9c102_vidioc_s_parm(cam, arg);
+
+	case VIDIOC_G_STD:
+	case VIDIOC_S_STD:
+	case VIDIOC_QUERYSTD:
+	case VIDIOC_ENUMSTD:
+	case VIDIOC_QUERYMENU:
+		return -EINVAL;
+
+	default:
+		return -EINVAL;
+
+	}
+}
+
+
+static int sn9c102_ioctl(struct inode* inode, struct file* filp,
+			 unsigned int cmd, unsigned long arg)
+{
+	struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
+	int err = 0;
+
+	if (mutex_lock_interruptible(&cam->fileop_mutex))
+		return -ERESTARTSYS;
+
+	if (cam->state & DEV_DISCONNECTED) {
+		DBG(1, "Device not present");
+		mutex_unlock(&cam->fileop_mutex);
+		return -ENODEV;
+	}
+
+	if (cam->state & DEV_MISCONFIGURED) {
+		DBG(1, "The camera is misconfigured. Close and open it "
+		       "again.");
+		mutex_unlock(&cam->fileop_mutex);
+		return -EIO;
+	}
+
+	V4LDBG(3, "sn9c102", cmd);
+
+	err = sn9c102_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
+
+	mutex_unlock(&cam->fileop_mutex);
+
+	return err;
+}
+
+/*****************************************************************************/
+
+static struct file_operations sn9c102_fops = {
+	.owner = THIS_MODULE,
+	.open =    sn9c102_open,
+	.release = sn9c102_release,
+	.ioctl =   sn9c102_ioctl,
+	.read =    sn9c102_read,
+	.poll =    sn9c102_poll,
+	.mmap =    sn9c102_mmap,
+	.llseek =  no_llseek,
+};
+
+/*****************************************************************************/
+
+/* It exists a single interface only. We do not need to validate anything. */
+static int
+sn9c102_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct sn9c102_device* cam;
+	static unsigned int dev_nr = 0;
+	unsigned int i;
+	int err = 0, r;
+
+	if (!(cam = kzalloc(sizeof(struct sn9c102_device), GFP_KERNEL)))
+		return -ENOMEM;
+
+	cam->usbdev = udev;
+
+	if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
+		DBG(1, "kmalloc() failed");
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	if (!(cam->v4ldev = video_device_alloc())) {
+		DBG(1, "video_device_alloc() failed");
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	mutex_init(&cam->dev_mutex);
+
+	r = sn9c102_read_reg(cam, 0x00);
+	if (r < 0 || r != 0x10) {
+		DBG(1, "Sorry, this is not a SN9C10x based camera "
+		       "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
+		err = -ENODEV;
+		goto fail;
+	}
+
+	cam->bridge = (id->idProduct & 0xffc0) == 0x6080 ?
+		      BRIDGE_SN9C103 : BRIDGE_SN9C102;
+	switch (cam->bridge) {
+	case BRIDGE_SN9C101:
+	case BRIDGE_SN9C102:
+		DBG(2, "SN9C10[12] PC Camera Controller detected "
+		       "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
+		break;
+	case BRIDGE_SN9C103:
+		DBG(2, "SN9C103 PC Camera Controller detected "
+		       "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
+		break;
+	}
+
+	for  (i = 0; sn9c102_sensor_table[i]; i++) {
+		err = sn9c102_sensor_table[i](cam);
+		if (!err)
+			break;
+	}
+
+	if (!err) {
+		DBG(2, "%s image sensor detected", cam->sensor.name);
+		DBG(3, "Support for %s maintained by %s",
+		    cam->sensor.name, cam->sensor.maintainer);
+	} else {
+		DBG(1, "No supported image sensor detected");
+		err = -ENODEV;
+		goto fail;
+	}
+
+	if (sn9c102_init(cam)) {
+		DBG(1, "Initialization failed. I will retry on open().");
+		cam->state |= DEV_MISCONFIGURED;
+	}
+
+	strcpy(cam->v4ldev->name, "SN9C10x PC Camera");
+	cam->v4ldev->owner = THIS_MODULE;
+	cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
+	cam->v4ldev->hardware = 0;
+	cam->v4ldev->fops = &sn9c102_fops;
+	cam->v4ldev->minor = video_nr[dev_nr];
+	cam->v4ldev->release = video_device_release;
+	video_set_drvdata(cam->v4ldev, cam);
+
+	mutex_lock(&cam->dev_mutex);
+
+	err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
+				    video_nr[dev_nr]);
+	if (err) {
+		DBG(1, "V4L2 device registration failed");
+		if (err == -ENFILE && video_nr[dev_nr] == -1)
+			DBG(1, "Free /dev/videoX node not found");
+		video_nr[dev_nr] = -1;
+		dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
+		mutex_unlock(&cam->dev_mutex);
+		goto fail;
+	}
+
+	DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
+
+	cam->module_param.force_munmap = force_munmap[dev_nr];
+	cam->module_param.frame_timeout = frame_timeout[dev_nr];
+
+	dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	sn9c102_create_sysfs(cam);
+	DBG(2, "Optional device control through 'sysfs' interface ready");
+#endif
+
+	usb_set_intfdata(intf, cam);
+
+	mutex_unlock(&cam->dev_mutex);
+
+	return 0;
+
+fail:
+	if (cam) {
+		kfree(cam->control_buffer);
+		if (cam->v4ldev)
+			video_device_release(cam->v4ldev);
+		kfree(cam);
+	}
+	return err;
+}
+
+
+static void sn9c102_usb_disconnect(struct usb_interface* intf)
+{
+	struct sn9c102_device* cam = usb_get_intfdata(intf);
+
+	if (!cam)
+		return;
+
+	down_write(&sn9c102_disconnect);
+
+	mutex_lock(&cam->dev_mutex);
+
+	DBG(2, "Disconnecting %s...", cam->v4ldev->name);
+
+	wake_up_interruptible_all(&cam->open);
+
+	if (cam->users) {
+		DBG(2, "Device /dev/video%d is open! Deregistration and "
+		       "memory deallocation are deferred on close.",
+		    cam->v4ldev->minor);
+		cam->state |= DEV_MISCONFIGURED;
+		sn9c102_stop_transfer(cam);
+		cam->state |= DEV_DISCONNECTED;
+		wake_up_interruptible(&cam->wait_frame);
+		wake_up(&cam->wait_stream);
+		usb_get_dev(cam->usbdev);
+	} else {
+		cam->state |= DEV_DISCONNECTED;
+		sn9c102_release_resources(cam);
+	}
+
+	mutex_unlock(&cam->dev_mutex);
+
+	if (!cam->users)
+		kfree(cam);
+
+	up_write(&sn9c102_disconnect);
+}
+
+
+static struct usb_driver sn9c102_usb_driver = {
+	.name =       "sn9c102",
+	.id_table =   sn9c102_id_table,
+	.probe =      sn9c102_usb_probe,
+	.disconnect = sn9c102_usb_disconnect,
+};
+
+/*****************************************************************************/
+
+static int __init sn9c102_module_init(void)
+{
+	int err = 0;
+
+	KDBG(2, SN9C102_MODULE_NAME " v" SN9C102_MODULE_VERSION);
+	KDBG(3, SN9C102_MODULE_AUTHOR);
+
+	if ((err = usb_register(&sn9c102_usb_driver)))
+		KDBG(1, "usb_register() failed");
+
+	return err;
+}
+
+
+static void __exit sn9c102_module_exit(void)
+{
+	usb_deregister(&sn9c102_usb_driver);
+}
+
+
+module_init(sn9c102_module_init);
+module_exit(sn9c102_module_exit);