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vicam.c

/*
 * USB ViCam WebCam driver
 * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
 *                    Christopher L Cheney (ccheney@cheney.cx),
 *                    Pavel Machek (pavel@suse.cz),
 *                    John Tyner (jtyner@cs.ucr.edu),
 *                    Monroe Williams (monroe@pobox.com)
 *
 * Supports 3COM HomeConnect PC Digital WebCam
 * Supports Compro PS39U WebCam
 *
 * 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.
 *
 * This source code is based heavily on the CPiA webcam driver which was
 * written by Peter Pregler, Scott J. Bertin and Johannes Erdfelt
 *
 * Portions of this code were also copied from usbvideo.c
 *
 * Special thanks to the whole team at Sourceforge for help making
 * this driver become a reality.  Notably:
 * Andy Armstrong who reverse engineered the color encoding and
 * Pavel Machek and Chris Cheney who worked on reverse engineering the
 *    camera controls and wrote the first generation driver.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/videodev.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include "usbvideo.h"

// #define VICAM_DEBUG

#ifdef VICAM_DEBUG
#define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __FUNCTION__, lineno, ##args)
#define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args)
#else
#define DBG(fmn,args...) do {} while(0)
#endif

#define DRIVER_AUTHOR           "Joe Burks, jburks@wavicle.org"
#define DRIVER_DESC             "ViCam WebCam Driver"

/* Define these values to match your device */
#define USB_VICAM_VENDOR_ID   0x04c1
#define USB_VICAM_PRODUCT_ID  0x009d
#define USB_COMPRO_VENDOR_ID  0x0602
#define USB_COMPRO_PRODUCT_ID 0x1001

#define VICAM_BYTES_PER_PIXEL   3
#define VICAM_MAX_READ_SIZE     (512*242+128)
#define VICAM_MAX_FRAME_SIZE    (VICAM_BYTES_PER_PIXEL*320*240)
#define VICAM_FRAMES            2

#define VICAM_HEADER_SIZE       64

#define clamp( x, l, h )        max_t( __typeof__( x ),         \
                               ( l ),                   \
                               min_t( __typeof__( x ),  \
                                    ( h ),            \
                                    ( x ) ) )

/* Not sure what all the bytes in these char
 * arrays do, but they're necessary to make
 * the camera work.
 */

static unsigned char setup1[] = {
      0xB6, 0xC3, 0x1F, 0x00, 0x02, 0x64, 0xE7, 0x67,
      0xFD, 0xFF, 0x0E, 0xC0, 0xE7, 0x09, 0xDE, 0x00,
      0x8E, 0x00, 0xC0, 0x09, 0x40, 0x03, 0xC0, 0x17,
      0x44, 0x03, 0x4B, 0xAF, 0xC0, 0x07, 0x00, 0x00,
      0x4B, 0xAF, 0x97, 0xCF, 0x00, 0x00
};

static unsigned char setup2[] = {
      0xB6, 0xC3, 0x03, 0x00, 0x03, 0x64, 0x18, 0x00,
      0x00, 0x00
};

static unsigned char setup3[] = {
      0xB6, 0xC3, 0x01, 0x00, 0x06, 0x64, 0x00, 0x00
};

static unsigned char setup4[] = {
      0xB6, 0xC3, 0x8F, 0x06, 0x02, 0x64, 0xE7, 0x07,
      0x00, 0x00, 0x08, 0xC0, 0xE7, 0x07, 0x00, 0x00,
      0x3E, 0xC0, 0xE7, 0x07, 0x54, 0x01, 0xAA, 0x00,
      0xE7, 0x07, 0xC8, 0x05, 0xB6, 0x00, 0xE7, 0x07,
      0x42, 0x01, 0xD2, 0x00, 0xE7, 0x07, 0x7C, 0x00,
      0x16, 0x00, 0xE7, 0x07, 0x56, 0x00, 0x18, 0x00,
      0xE7, 0x07, 0x06, 0x00, 0x92, 0xC0, 0xE7, 0x07,
      0x00, 0x00, 0x1E, 0xC0, 0xE7, 0x07, 0xFF, 0xFF,
      0x22, 0xC0, 0xE7, 0x07, 0x04, 0x00, 0x24, 0xC0,
      0xE7, 0x07, 0xEC, 0x27, 0x28, 0xC0, 0xE7, 0x07,
      0x16, 0x01, 0x8E, 0x00, 0xE7, 0x87, 0x01, 0x00,
      0x0E, 0xC0, 0x97, 0xCF, 0xD7, 0x09, 0x00, 0xC0,
      0xE7, 0x77, 0x01, 0x00, 0x92, 0xC0, 0x09, 0xC1,
      0xE7, 0x09, 0xFE, 0x05, 0x24, 0x01, 0xE7, 0x09,
      0x04, 0x06, 0x26, 0x01, 0xE7, 0x07, 0x07, 0x00,
      0x92, 0xC0, 0xE7, 0x05, 0x00, 0xC0, 0xC0, 0xDF,
      0x97, 0xCF, 0x17, 0x00, 0x57, 0x00, 0x17, 0x02,
      0xD7, 0x09, 0x00, 0xC0, 0xE7, 0x77, 0x01, 0x00,
      0x92, 0xC0, 0x0A, 0xC1, 0xE7, 0x57, 0xFF, 0xFF,
      0xFA, 0x05, 0x0D, 0xC0, 0xE7, 0x57, 0x00, 0x00,
      0xFA, 0x05, 0x0F, 0xC0, 0x9F, 0xAF, 0xC6, 0x00,
      0xE7, 0x05, 0x00, 0xC0, 0xC8, 0x05, 0xC1, 0x05,
      0xC0, 0x05, 0xC0, 0xDF, 0x97, 0xCF, 0x27, 0xDA,
      0xFA, 0x05, 0xEF, 0x07, 0x01, 0x00, 0x0B, 0x06,
      0x73, 0xCF, 0x9F, 0xAF, 0x78, 0x01, 0x9F, 0xAF,
      0x1A, 0x03, 0x6E, 0xCF, 0xE7, 0x09, 0xFC, 0x05,
      0x24, 0x01, 0xE7, 0x09, 0x02, 0x06, 0x26, 0x01,
      0xE7, 0x07, 0x07, 0x00, 0x92, 0xC0, 0xE7, 0x09,
      0xFC, 0x05, 0xFE, 0x05, 0xE7, 0x09, 0x02, 0x06,
      0x04, 0x06, 0xE7, 0x09, 0x00, 0x06, 0xFC, 0x05,
      0xE7, 0x09, 0xFE, 0x05, 0x00, 0x06, 0x27, 0xDA,
      0xFA, 0x05, 0xE7, 0x57, 0x01, 0x00, 0xFA, 0x05,
      0x02, 0xCA, 0x04, 0xC0, 0x97, 0xCF, 0x9F, 0xAF,
      0x66, 0x05, 0x97, 0xCF, 0xE7, 0x07, 0x40, 0x00,
      0x02, 0x06, 0xC8, 0x09, 0xFC, 0x05, 0x9F, 0xAF,
      0xDA, 0x02, 0x97, 0xCF, 0xCF, 0x17, 0x02, 0x00,
      0xEF, 0x57, 0x81, 0x00, 0x09, 0x06, 0x9F, 0xA0,
      0xB6, 0x01, 0xEF, 0x57, 0x80, 0x00, 0x09, 0x06,
      0x9F, 0xA0, 0x40, 0x02, 0xEF, 0x57, 0x01, 0x00,
      0x0B, 0x06, 0x9F, 0xA0, 0x46, 0x03, 0xE7, 0x07,
      0x01, 0x00, 0x0A, 0xC0, 0x46, 0xAF, 0x47, 0xAF,
      0x9F, 0xAF, 0x40, 0x02, 0xE7, 0x07, 0x2E, 0x00,
      0x0A, 0xC0, 0xEF, 0x87, 0x80, 0x00, 0x09, 0x06,
      0x97, 0xCF, 0x00, 0x0E, 0x01, 0x00, 0xC0, 0x57,
      0x51, 0x00, 0x9F, 0xC0, 0x9E, 0x02, 0xC0, 0x57,
      0x50, 0x00, 0x20, 0xC0, 0xC0, 0x57, 0x55, 0x00,
      0x12, 0xC0, 0xC0, 0x57, 0x56, 0x00, 0x9F, 0xC0,
      0x72, 0x02, 0x9F, 0xCF, 0xD6, 0x02, 0xC1, 0x0B,
      0x08, 0x06, 0x01, 0xD0, 0x6F, 0x90, 0x08, 0x06,
      0xC0, 0x07, 0x08, 0x00, 0xC1, 0x0B, 0x08, 0x06,
      0x9F, 0xAF, 0x28, 0x05, 0x97, 0xCF, 0x2F, 0x0E,
      0x02, 0x00, 0x08, 0x06, 0xC0, 0x07, 0x08, 0x00,
      0xC1, 0x0B, 0x08, 0x06, 0x9F, 0xAF, 0x28, 0x05,
      0x9F, 0xCF, 0xD6, 0x02, 0x2F, 0x0E, 0x02, 0x00,
      0x09, 0x06, 0xEF, 0x87, 0x80, 0x00, 0x09, 0x06,
      0x9F, 0xCF, 0xD6, 0x02, 0xEF, 0x67, 0x7F, 0xFF,
      0x09, 0x06, 0xE7, 0x67, 0xFF, 0xFD, 0x22, 0xC0,
      0xE7, 0x67, 0xEF, 0xFF, 0x24, 0xC0, 0xE7, 0x87,
      0x10, 0x00, 0x28, 0xC0, 0x9F, 0xAF, 0xB8, 0x05,
      0xE7, 0x87, 0xE0, 0x21, 0x24, 0xC0, 0x9F, 0xAF,
      0xA8, 0x05, 0xE7, 0x87, 0x08, 0x00, 0x24, 0xC0,
      0xE7, 0x67, 0xDF, 0xFF, 0x24, 0xC0, 0xC8, 0x07,
      0x0A, 0x00, 0xC0, 0x07, 0x00, 0x00, 0xC1, 0x07,
      0x01, 0x00, 0x9F, 0xAF, 0x28, 0x05, 0x9F, 0xAF,
      0xB8, 0x05, 0xC0, 0x07, 0x9E, 0x00, 0x9F, 0xAF,
      0x44, 0x05, 0xE7, 0x67, 0xFF, 0xFE, 0x24, 0xC0,
      0xC0, 0x09, 0x20, 0xC0, 0xE7, 0x87, 0x00, 0x01,
      0x24, 0xC0, 0xC0, 0x77, 0x00, 0x02, 0x0F, 0xC1,
      0xE7, 0x67, 0xF7, 0xFF, 0x24, 0xC0, 0xE7, 0x67,
      0xF7, 0xFF, 0x24, 0xC0, 0xE7, 0x87, 0x08, 0x00,
      0x24, 0xC0, 0x08, 0xDA, 0x5E, 0xC1, 0xEF, 0x07,
      0x80, 0x00, 0x09, 0x06, 0x97, 0xCF, 0xEF, 0x07,
      0x01, 0x00, 0x0A, 0x06, 0x97, 0xCF, 0xEF, 0x07,
      0x00, 0x00, 0x0B, 0x06, 0xEF, 0x07, 0x00, 0x00,
      0x0A, 0x06, 0xEF, 0x67, 0x7F, 0xFF, 0x09, 0x06,
      0xEF, 0x07, 0x00, 0x00, 0x0D, 0x06, 0xE7, 0x67,
      0xEF, 0xFF, 0x28, 0xC0, 0xE7, 0x67, 0x17, 0xD8,
      0x24, 0xC0, 0xE7, 0x07, 0x00, 0x00, 0x1E, 0xC0,
      0xE7, 0x07, 0xFF, 0xFF, 0x22, 0xC0, 0x97, 0xCF,
      0xC8, 0x07, 0x0E, 0x06, 0x9F, 0xAF, 0xDA, 0x02,
      0xE7, 0x07, 0x00, 0x00, 0xF2, 0x05, 0xE7, 0x07,
      0x10, 0x00, 0xF6, 0x05, 0xE7, 0x07, 0x0E, 0x06,
      0xF4, 0x05, 0xE7, 0x07, 0xD6, 0x02, 0xF8, 0x05,
      0xC8, 0x07, 0xF2, 0x05, 0xC1, 0x07, 0x00, 0x80,
      0x50, 0xAF, 0x97, 0xCF, 0x2F, 0x0C, 0x02, 0x00,
      0x07, 0x06, 0x2F, 0x0C, 0x04, 0x00, 0x06, 0x06,
      0xE7, 0x07, 0x00, 0x00, 0xF2, 0x05, 0xE7, 0x07,
      0x10, 0x00, 0xF6, 0x05, 0xE7, 0x07, 0xE2, 0x05,
      0xF4, 0x05, 0xE7, 0x07, 0xCE, 0x02, 0xF8, 0x05,
      0xC8, 0x07, 0xF2, 0x05, 0xC1, 0x07, 0x00, 0x80,
      0x51, 0xAF, 0x97, 0xCF, 0x9F, 0xAF, 0x66, 0x04,
      0x9F, 0xAF, 0x1A, 0x03, 0x59, 0xAF, 0x97, 0xCF,
      0xC0, 0x07, 0x0E, 0x00, 0xC1, 0x0B, 0x0C, 0x06,
      0x41, 0xD1, 0x9F, 0xAF, 0x28, 0x05, 0xC0, 0x07,
      0x3C, 0x00, 0x9F, 0xAF, 0x44, 0x05, 0x68, 0x00,
      0xC0, 0x07, 0x3B, 0x00, 0x9F, 0xAF, 0x44, 0x05,
      0x6F, 0x00, 0x0C, 0x06, 0x68, 0x00, 0xE0, 0x07,
      0x04, 0x01, 0xE8, 0x0B, 0x0A, 0x06, 0xE8, 0x07,
      0x00, 0x00, 0xE0, 0x07, 0x00, 0x02, 0xE0, 0x07,
      0xEC, 0x01, 0xE0, 0x07, 0xFC, 0xFF, 0x97, 0xCF,
      0xE7, 0x07, 0xFF, 0xFF, 0xFA, 0x05, 0xEF, 0x07,
      0x00, 0x00, 0x0B, 0x06, 0xE7, 0x07, 0x0E, 0x06,
      0x24, 0x01, 0xE7, 0x07, 0x0E, 0x06, 0xFE, 0x05,
      0xE7, 0x07, 0x40, 0x00, 0x26, 0x01, 0xE7, 0x07,
      0x40, 0x00, 0x04, 0x06, 0xE7, 0x07, 0x07, 0x00,
      0x92, 0xC0, 0x97, 0xCF, 0xEF, 0x07, 0x02, 0x00,
      0x0B, 0x06, 0x9F, 0xAF, 0x78, 0x01, 0xEF, 0x77,
      0x80, 0x00, 0x07, 0x06, 0x9F, 0xC0, 0x14, 0x04,
      0xEF, 0x77, 0x01, 0x00, 0x07, 0x06, 0x37, 0xC0,
      0xEF, 0x77, 0x01, 0x00, 0x0D, 0x06, 0x0F, 0xC1,
      0xEF, 0x07, 0x01, 0x00, 0x0D, 0x06, 0xC0, 0x07,
      0x02, 0x00, 0xC1, 0x07, 0x30, 0x00, 0x9F, 0xAF,
      0x28, 0x05, 0xC0, 0x07, 0x01, 0x00, 0xC1, 0x07,
      0x02, 0x00, 0x9F, 0xAF, 0x28, 0x05, 0xC8, 0x07,
      0xFF, 0x4F, 0x9F, 0xAF, 0xA8, 0x05, 0xC0, 0x07,
      0x38, 0x00, 0x9F, 0xAF, 0x44, 0x05, 0xC1, 0x77,
      0x03, 0x00, 0x02, 0xC1, 0x08, 0xDA, 0x75, 0xC1,
      0xC1, 0x77, 0x01, 0x00, 0x0A, 0xC1, 0xC0, 0x07,
      0x01, 0x00, 0xC1, 0x07, 0x02, 0x00, 0x9F, 0xAF,
      0x28, 0x05, 0xEF, 0x07, 0x01, 0x00, 0x06, 0x06,
      0x2C, 0xCF, 0xC0, 0x07, 0x01, 0x00, 0xC1, 0x07,
      0x04, 0x00, 0x9F, 0xAF, 0x28, 0x05, 0xEF, 0x07,
      0x00, 0x00, 0x06, 0x06, 0x22, 0xCF, 0xEF, 0x07,
      0x00, 0x00, 0x0D, 0x06, 0xEF, 0x57, 0x01, 0x00,
      0x06, 0x06, 0x1B, 0xC0, 0xC0, 0x07, 0x01, 0x00,
      0xC1, 0x07, 0x01, 0x00, 0x9F, 0xAF, 0x28, 0x05,
      0xC0, 0x07, 0x02, 0x00, 0xC1, 0x07, 0x30, 0x00,
      0x9F, 0xAF, 0x28, 0x05, 0xC8, 0x07, 0xFF, 0x4F,
      0x9F, 0xAF, 0xA8, 0x05, 0xC0, 0x07, 0x38, 0x00,
      0x9F, 0xAF, 0x44, 0x05, 0xC1, 0x67, 0x03, 0x00,
      0xC1, 0x57, 0x03, 0x00, 0x02, 0xC0, 0x08, 0xDA,
      0x73, 0xC1, 0xC0, 0x07, 0x02, 0x00, 0xC1, 0x07,
      0x12, 0x00, 0xEF, 0x57, 0x00, 0x00, 0x06, 0x06,
      0x02, 0xC0, 0xC1, 0x07, 0x23, 0x00, 0x9F, 0xAF,
      0x28, 0x05, 0xC0, 0x07, 0x14, 0x00, 0xC1, 0x0B,
      0xEA, 0x05, 0x9F, 0xAF, 0x28, 0x05, 0xC0, 0x07,
      0x3E, 0x00, 0x9F, 0xAF, 0x0A, 0x05, 0xE7, 0x09,
      0xE4, 0x05, 0xFA, 0x05, 0x27, 0xD8, 0xFA, 0x05,
      0xE7, 0x07, 0x0E, 0x06, 0xFC, 0x05, 0xE7, 0x07,
      0x4E, 0x06, 0x00, 0x06, 0xE7, 0x07, 0x40, 0x00,
      0x02, 0x06, 0x9F, 0xAF, 0x66, 0x05, 0x9F, 0xAF,
      0xC6, 0x00, 0x97, 0xCF, 0xC1, 0x0B, 0xE2, 0x05,
      0x41, 0xD0, 0x01, 0xD2, 0xC1, 0x17, 0x23, 0x00,
      0x9F, 0xAF, 0xDC, 0x04, 0xC0, 0x07, 0x04, 0x00,
      0xC1, 0x0B, 0xE3, 0x05, 0x9F, 0xAF, 0x28, 0x05,
      0xC0, 0x07, 0x06, 0x00, 0xC1, 0x09, 0xE6, 0x05,
      0x9F, 0xAF, 0x28, 0x05, 0xC0, 0x07, 0x07, 0x00,
      0xC1, 0x09, 0xE6, 0x05, 0xC1, 0xD1, 0x9F, 0xAF,
      0x28, 0x05, 0xC0, 0x07, 0x0B, 0x00, 0xC1, 0x09,
      0xE8, 0x05, 0x9F, 0xAF, 0x28, 0x05, 0xC0, 0x07,
      0x0C, 0x00, 0xC1, 0x09, 0xE8, 0x05, 0xC1, 0xD1,
      0x9F, 0xAF, 0x28, 0x05, 0xC0, 0x07, 0x0D, 0x00,
      0xC1, 0x07, 0x09, 0x00, 0x9F, 0xAF, 0x28, 0x05,
      0xC0, 0x07, 0x03, 0x00, 0xC1, 0x07, 0x32, 0x00,
      0x9F, 0xAF, 0x28, 0x05, 0xC0, 0x07, 0x0F, 0x00,
      0xC1, 0x07, 0x00, 0x00, 0x9F, 0xAF, 0x28, 0x05,
      0x97, 0xCF, 0xE7, 0x67, 0xFF, 0xD9, 0x24, 0xC0,
      0xC8, 0x07, 0x0A, 0x00, 0x40, 0x00, 0xC0, 0x67,
      0x00, 0x02, 0x27, 0x80, 0x24, 0xC0, 0xE7, 0x87,
      0x00, 0x04, 0x24, 0xC0, 0xE7, 0x67, 0xFF, 0xF9,
      0x24, 0xC0, 0x01, 0xD2, 0x08, 0xDA, 0x72, 0xC1,
      0xE7, 0x87, 0x00, 0x20, 0x24, 0xC0, 0x97, 0xCF,
      0x27, 0x00, 0x1E, 0xC0, 0xE7, 0x87, 0xFF, 0x00,
      0x22, 0xC0, 0xE7, 0x67, 0x7F, 0xFF, 0x24, 0xC0,
      0xE7, 0x87, 0x80, 0x00, 0x24, 0xC0, 0xE7, 0x87,
      0x80, 0x00, 0x24, 0xC0, 0x97, 0xCF, 0x9F, 0xAF,
      0x0A, 0x05, 0x67, 0x00, 0x1E, 0xC0, 0xE7, 0x67,
      0xBF, 0xFF, 0x24, 0xC0, 0xE7, 0x87, 0x40, 0x00,
      0x24, 0xC0, 0xE7, 0x87, 0x40, 0x00, 0x24, 0xC0,
      0x97, 0xCF, 0x9F, 0xAF, 0x0A, 0x05, 0xE7, 0x67,
      0x00, 0xFF, 0x22, 0xC0, 0xE7, 0x67, 0xFF, 0xFE,
      0x24, 0xC0, 0xE7, 0x67, 0xFF, 0xFE, 0x24, 0xC0,
      0xC1, 0x09, 0x20, 0xC0, 0xE7, 0x87, 0x00, 0x01,
      0x24, 0xC0, 0x97, 0xCF, 0xC0, 0x07, 0x40, 0x00,
      0xC8, 0x09, 0xFC, 0x05, 0xE7, 0x67, 0x00, 0xFF,
      0x22, 0xC0, 0xE7, 0x67, 0xFF, 0xFE, 0x24, 0xC0,
      0xE7, 0x67, 0xBF, 0xFF, 0x24, 0xC0, 0xE7, 0x67,
      0xBF, 0xFF, 0x24, 0xC0, 0x00, 0xDA, 0xE8, 0x09,
      0x20, 0xC0, 0xE7, 0x87, 0x40, 0x00, 0x24, 0xC0,
      0xE7, 0x87, 0x40, 0x00, 0x24, 0xC0, 0x00, 0xDA,
      0xE8, 0x09, 0x20, 0xC0, 0x6D, 0xC1, 0xE7, 0x87,
      0x00, 0x01, 0x24, 0xC0, 0x97, 0xCF, 0xE7, 0x07,
      0x32, 0x00, 0x12, 0xC0, 0xE7, 0x77, 0x00, 0x80,
      0x12, 0xC0, 0x7C, 0xC0, 0x97, 0xCF, 0xE7, 0x07,
      0x20, 0x4E, 0x12, 0xC0, 0xE7, 0x77, 0x00, 0x80,
      0x12, 0xC0, 0x7C, 0xC0, 0x97, 0xCF, 0x09, 0x02,
      0x19, 0x00, 0x01, 0x01, 0x00, 0x80, 0x96, 0x09,
      0x04, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
      0x07, 0x05, 0x81, 0x02, 0x40, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

static unsigned char setup5[] = {
      0xB6, 0xC3, 0x2F, 0x01, 0x03, 0x64, 0x0E, 0x00,
      0x14, 0x00, 0x1A, 0x00, 0x20, 0x00, 0x26, 0x00,
      0x4A, 0x00, 0x64, 0x00, 0x6A, 0x00, 0x92, 0x00,
      0x9A, 0x00, 0xA0, 0x00, 0xB2, 0x00, 0xB8, 0x00,
      0xBE, 0x00, 0xC2, 0x00, 0xC8, 0x00, 0xCE, 0x00,
      0xDC, 0x00, 0xDA, 0x00, 0xE2, 0x00, 0xE0, 0x00,
      0xE8, 0x00, 0xE6, 0x00, 0xEE, 0x00, 0xEC, 0x00,
      0xF2, 0x00, 0xF8, 0x00, 0x02, 0x01, 0x0A, 0x01,
      0x0E, 0x01, 0x12, 0x01, 0x1E, 0x01, 0x22, 0x01,
      0x28, 0x01, 0x2C, 0x01, 0x32, 0x01, 0x36, 0x01,
      0x44, 0x01, 0x50, 0x01, 0x5E, 0x01, 0x72, 0x01,
      0x76, 0x01, 0x7A, 0x01, 0x80, 0x01, 0x88, 0x01,
      0x8C, 0x01, 0x94, 0x01, 0x9C, 0x01, 0xA0, 0x01,
      0xA4, 0x01, 0xAA, 0x01, 0xB0, 0x01, 0xB4, 0x01,
      0xBA, 0x01, 0xD0, 0x01, 0xDA, 0x01, 0xF6, 0x01,
      0xFA, 0x01, 0x02, 0x02, 0x34, 0x02, 0x3C, 0x02,
      0x44, 0x02, 0x4A, 0x02, 0x50, 0x02, 0x56, 0x02,
      0x74, 0x02, 0x78, 0x02, 0x7E, 0x02, 0x84, 0x02,
      0x8A, 0x02, 0x88, 0x02, 0x90, 0x02, 0x8E, 0x02,
      0x94, 0x02, 0xA2, 0x02, 0xA8, 0x02, 0xAE, 0x02,
      0xB4, 0x02, 0xBA, 0x02, 0xB8, 0x02, 0xC0, 0x02,
      0xBE, 0x02, 0xC4, 0x02, 0xD0, 0x02, 0xD4, 0x02,
      0xE0, 0x02, 0xE6, 0x02, 0xEE, 0x02, 0xF8, 0x02,
      0xFC, 0x02, 0x06, 0x03, 0x1E, 0x03, 0x24, 0x03,
      0x28, 0x03, 0x30, 0x03, 0x2E, 0x03, 0x3C, 0x03,
      0x4A, 0x03, 0x4E, 0x03, 0x54, 0x03, 0x58, 0x03,
      0x5E, 0x03, 0x66, 0x03, 0x6E, 0x03, 0x7A, 0x03,
      0x86, 0x03, 0x8E, 0x03, 0x96, 0x03, 0xB2, 0x03,
      0xB8, 0x03, 0xC6, 0x03, 0xCC, 0x03, 0xD4, 0x03,
      0xDA, 0x03, 0xE8, 0x03, 0xF4, 0x03, 0xFC, 0x03,
      0x04, 0x04, 0x20, 0x04, 0x2A, 0x04, 0x32, 0x04,
      0x36, 0x04, 0x3E, 0x04, 0x44, 0x04, 0x42, 0x04,
      0x48, 0x04, 0x4E, 0x04, 0x4C, 0x04, 0x54, 0x04,
      0x52, 0x04, 0x5A, 0x04, 0x5E, 0x04, 0x62, 0x04,
      0x68, 0x04, 0x74, 0x04, 0x7C, 0x04, 0x80, 0x04,
      0x88, 0x04, 0x8C, 0x04, 0x94, 0x04, 0x9A, 0x04,
      0xA2, 0x04, 0xA6, 0x04, 0xAE, 0x04, 0xB4, 0x04,
      0xC0, 0x04, 0xCC, 0x04, 0xD8, 0x04, 0x2A, 0x05,
      0x46, 0x05, 0x6C, 0x05, 0x00, 0x00
};

/* rvmalloc / rvfree copied from usbvideo.c
 *
 * Not sure why these are not yet non-statics which I can reference through
 * usbvideo.h the same as it is in 2.4.20.  I bet this will get fixed sometime
 * in the future.
 *
*/
static void *rvmalloc(unsigned long size)
{
      void *mem;
      unsigned long adr;

      size = PAGE_ALIGN(size);
      mem = vmalloc_32(size);
      if (!mem)
            return NULL;

      memset(mem, 0, size); /* Clear the ram out, no junk to the user */
      adr = (unsigned long) mem;
      while (size > 0) {
            SetPageReserved(vmalloc_to_page((void *)adr));
            adr += PAGE_SIZE;
            size -= PAGE_SIZE;
      }

      return mem;
}

static void rvfree(void *mem, unsigned long size)
{
      unsigned long adr;

      if (!mem)
            return;

      adr = (unsigned long) mem;
      while ((long) size > 0) {
            ClearPageReserved(vmalloc_to_page((void *)adr));
            adr += PAGE_SIZE;
            size -= PAGE_SIZE;
      }
      vfree(mem);
}

struct vicam_camera {
      u16 shutter_speed;      // capture shutter speed
      u16 gain;         // capture gain

      u8 *raw_image;          // raw data captured from the camera
      u8 *framebuf;           // processed data in RGB24 format
      u8 *cntrlbuf;           // area used to send control msgs

      struct video_device vdev;     // v4l video device
      struct usb_device *udev;      // usb device

      /* guard against simultaneous accesses to the camera */
      struct mutex cam_lock;

      int is_initialized;
      u8 open_count;
      u8 bulkEndpoint;
      int needsDummyRead;
};

static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
static void vicam_disconnect(struct usb_interface *intf);
static void read_frame(struct vicam_camera *cam, int framenum);
static void vicam_decode_color(const u8 *, u8 *);

static int __send_control_msg(struct vicam_camera *cam,
                        u8 request,
                        u16 value,
                        u16 index,
                        unsigned char *cp,
                        u16 size)
{
      int status;

      /* cp must be memory that has been allocated by kmalloc */

      status = usb_control_msg(cam->udev,
                         usb_sndctrlpipe(cam->udev, 0),
                         request,
                         USB_DIR_OUT | USB_TYPE_VENDOR |
                         USB_RECIP_DEVICE, value, index,
                         cp, size, 1000);

      status = min(status, 0);

      if (status < 0) {
            printk(KERN_INFO "Failed sending control message, error %d.\n",
                   status);
      }

      return status;
}

static int send_control_msg(struct vicam_camera *cam,
                      u8 request,
                      u16 value,
                      u16 index,
                      unsigned char *cp,
                      u16 size)
{
      int status = -ENODEV;
      mutex_lock(&cam->cam_lock);
      if (cam->udev) {
            status = __send_control_msg(cam, request, value,
                                  index, cp, size);
      }
      mutex_unlock(&cam->cam_lock);
      return status;
}
static int
initialize_camera(struct vicam_camera *cam)
{
      const struct {
            u8 *data;
            u32 size;
      } firmware[] = {
            { .data = setup1, .size = sizeof(setup1) },
            { .data = setup2, .size = sizeof(setup2) },
            { .data = setup3, .size = sizeof(setup3) },
            { .data = setup4, .size = sizeof(setup4) },
            { .data = setup5, .size = sizeof(setup5) },
            { .data = setup3, .size = sizeof(setup3) },
            { .data = NULL, .size = 0 }
      };

      int err, i;

      for (i = 0, err = 0; firmware[i].data && !err; i++) {
            memcpy(cam->cntrlbuf, firmware[i].data, firmware[i].size);

            err = send_control_msg(cam, 0xff, 0, 0,
                               cam->cntrlbuf, firmware[i].size);
      }

      return err;
}

static int
set_camera_power(struct vicam_camera *cam, int state)
{
      int status;

      if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0)
            return status;

      if (state) {
            send_control_msg(cam, 0x55, 1, 0, NULL, 0);
      }

      return 0;
}

static int
vicam_ioctl(struct inode *inode, struct file *file, unsigned int ioctlnr, unsigned long arg)
{
      void __user *user_arg = (void __user *)arg;
      struct vicam_camera *cam = file->private_data;
      int retval = 0;

      if (!cam)
            return -ENODEV;

      switch (ioctlnr) {
            /* query capabilities */
      case VIDIOCGCAP:
            {
                  struct video_capability b;

                  DBG("VIDIOCGCAP\n");
                  memset(&b, 0, sizeof(b));
                  strcpy(b.name, "ViCam-based Camera");
                  b.type = VID_TYPE_CAPTURE;
                  b.channels = 1;
                  b.audios = 0;
                  b.maxwidth = 320; /* VIDEOSIZE_CIF */
                  b.maxheight = 240;
                  b.minwidth = 320; /* VIDEOSIZE_48_48 */
                  b.minheight = 240;

                  if (copy_to_user(user_arg, &b, sizeof(b)))
                        retval = -EFAULT;

                  break;
            }
            /* get/set video source - we are a camera and nothing else */
      case VIDIOCGCHAN:
            {
                  struct video_channel v;

                  DBG("VIDIOCGCHAN\n");
                  if (copy_from_user(&v, user_arg, sizeof(v))) {
                        retval = -EFAULT;
                        break;
                  }
                  if (v.channel != 0) {
                        retval = -EINVAL;
                        break;
                  }

                  v.channel = 0;
                  strcpy(v.name, "Camera");
                  v.tuners = 0;
                  v.flags = 0;
                  v.type = VIDEO_TYPE_CAMERA;
                  v.norm = 0;

                  if (copy_to_user(user_arg, &v, sizeof(v)))
                        retval = -EFAULT;
                  break;
            }

      case VIDIOCSCHAN:
            {
                  int v;

                  if (copy_from_user(&v, user_arg, sizeof(v)))
                        retval = -EFAULT;
                  DBG("VIDIOCSCHAN %d\n", v);

                  if (retval == 0 && v != 0)
                        retval = -EINVAL;

                  break;
            }

            /* image properties */
      case VIDIOCGPICT:
            {
                  struct video_picture vp;
                  DBG("VIDIOCGPICT\n");
                  memset(&vp, 0, sizeof (struct video_picture));
                  vp.brightness = cam->gain << 8;
                  vp.depth = 24;
                  vp.palette = VIDEO_PALETTE_RGB24;
                  if (copy_to_user(user_arg, &vp, sizeof (struct video_picture)))
                        retval = -EFAULT;
                  break;
            }

      case VIDIOCSPICT:
            {
                  struct video_picture vp;

                  if (copy_from_user(&vp, user_arg, sizeof(vp))) {
                        retval = -EFAULT;
                        break;
                  }

                  DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth,
                      vp.palette);

                  cam->gain = vp.brightness >> 8;

                  if (vp.depth != 24
                      || vp.palette != VIDEO_PALETTE_RGB24)
                        retval = -EINVAL;

                  break;
            }

            /* get/set capture window */
      case VIDIOCGWIN:
            {
                  struct video_window vw;
                  vw.x = 0;
                  vw.y = 0;
                  vw.width = 320;
                  vw.height = 240;
                  vw.chromakey = 0;
                  vw.flags = 0;
                  vw.clips = NULL;
                  vw.clipcount = 0;

                  DBG("VIDIOCGWIN\n");

                  if (copy_to_user(user_arg, (void *)&vw, sizeof(vw)))
                        retval = -EFAULT;

                  // I'm not sure what the deal with a capture window is, it is very poorly described
                  // in the doc.  So I won't support it now.
                  break;
            }

      case VIDIOCSWIN:
            {

                  struct video_window vw;

                  if (copy_from_user(&vw, user_arg, sizeof(vw))) {
                        retval = -EFAULT;
                        break;
                  }

                  DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height);

                  if ( vw.width != 320 || vw.height != 240 )
                        retval = -EFAULT;

                  break;
            }

            /* mmap interface */
      case VIDIOCGMBUF:
            {
                  struct video_mbuf vm;
                  int i;

                  DBG("VIDIOCGMBUF\n");
                  memset(&vm, 0, sizeof (vm));
                  vm.size =
                      VICAM_MAX_FRAME_SIZE * VICAM_FRAMES;
                  vm.frames = VICAM_FRAMES;
                  for (i = 0; i < VICAM_FRAMES; i++)
                        vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i;

                  if (copy_to_user(user_arg, (void *)&vm, sizeof(vm)))
                        retval = -EFAULT;

                  break;
            }

      case VIDIOCMCAPTURE:
            {
                  struct video_mmap vm;
                  // int video_size;

                  if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) {
                        retval = -EFAULT;
                        break;
                  }

                  DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format);

                  if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 )
                        retval = -EINVAL;

                  // in theory right here we'd start the image capturing
                  // (fill in a bulk urb and submit it asynchronously)
                  //
                  // Instead we're going to do a total hack job for now and
                  // retrieve the frame in VIDIOCSYNC

                  break;
            }

      case VIDIOCSYNC:
            {
                  int frame;

                  if (copy_from_user((void *)&frame, user_arg, sizeof(int))) {
                        retval = -EFAULT;
                        break;
                  }
                  DBG("VIDIOCSYNC: %d\n", frame);

                  read_frame(cam, frame);
                  vicam_decode_color(cam->raw_image,
                                 cam->framebuf +
                                 frame * VICAM_MAX_FRAME_SIZE );

                  break;
            }

            /* pointless to implement overlay with this camera */
      case VIDIOCCAPTURE:
      case VIDIOCGFBUF:
      case VIDIOCSFBUF:
      case VIDIOCKEY:
            retval = -EINVAL;
            break;

            /* tuner interface - we have none */
      case VIDIOCGTUNER:
      case VIDIOCSTUNER:
      case VIDIOCGFREQ:
      case VIDIOCSFREQ:
            retval = -EINVAL;
            break;

            /* audio interface - we have none */
      case VIDIOCGAUDIO:
      case VIDIOCSAUDIO:
            retval = -EINVAL;
            break;
      default:
            retval = -ENOIOCTLCMD;
            break;
      }

      return retval;
}

static int
vicam_open(struct inode *inode, struct file *file)
{
      struct video_device *dev = video_devdata(file);
      struct vicam_camera *cam =
          (struct vicam_camera *) dev->priv;
      DBG("open\n");

      if (!cam) {
            printk(KERN_ERR
                   "vicam video_device improperly initialized");
            return -EINVAL;
      }

      /* the videodev_lock held above us protects us from
       * simultaneous opens...for now. we probably shouldn't
       * rely on this fact forever.
       */

      if (cam->open_count > 0) {
            printk(KERN_INFO
                   "vicam_open called on already opened camera");
            return -EBUSY;
      }

      cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
      if (!cam->raw_image) {
            return -ENOMEM;
      }

      cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
      if (!cam->framebuf) {
            kfree(cam->raw_image);
            return -ENOMEM;
      }

      cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
      if (!cam->cntrlbuf) {
            kfree(cam->raw_image);
            rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
            return -ENOMEM;
      }

      // First upload firmware, then turn the camera on

      if (!cam->is_initialized) {
            initialize_camera(cam);

            cam->is_initialized = 1;
      }

      set_camera_power(cam, 1);

      cam->needsDummyRead = 1;
      cam->open_count++;

      file->private_data = cam;

      return 0;
}

static int
vicam_close(struct inode *inode, struct file *file)
{
      struct vicam_camera *cam = file->private_data;
      int open_count;
      struct usb_device *udev;

      DBG("close\n");

      /* it's not the end of the world if
       * we fail to turn the camera off.
       */

      set_camera_power(cam, 0);

      kfree(cam->raw_image);
      rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
      kfree(cam->cntrlbuf);

      mutex_lock(&cam->cam_lock);

      cam->open_count--;
      open_count = cam->open_count;
      udev = cam->udev;

      mutex_unlock(&cam->cam_lock);

      if (!open_count && !udev) {
            kfree(cam);
      }

      return 0;
}

static void vicam_decode_color(const u8 *data, u8 *rgb)
{
      /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB
       * Copyright (C) 2002 Monroe Williams (monroe@pobox.com)
       */

      int i, prevY, nextY;

      prevY = 512;
      nextY = 512;

      data += VICAM_HEADER_SIZE;

      for( i = 0; i < 240; i++, data += 512 ) {
            const int y = ( i * 242 ) / 240;

            int j, prevX, nextX;
            int Y, Cr, Cb;

            if ( y == 242 - 1 ) {
                  nextY = -512;
            }

            prevX = 1;
            nextX = 1;

            for ( j = 0; j < 320; j++, rgb += 3 ) {
                  const int x = ( j * 512 ) / 320;
                  const u8 * const src = &data[x];

                  if ( x == 512 - 1 ) {
                        nextX = -1;
                  }

                  Cr = ( src[prevX] - src[0] ) +
                        ( src[nextX] - src[0] );
                  Cr /= 2;

                  Cb = ( src[prevY] - src[prevX + prevY] ) +
                        ( src[prevY] - src[nextX + prevY] ) +
                        ( src[nextY] - src[prevX + nextY] ) +
                        ( src[nextY] - src[nextX + nextY] );
                  Cb /= 4;

                  Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 );

                  if ( i & 1 ) {
                        int Ct = Cr;
                        Cr = Cb;
                        Cb = Ct;
                  }

                  if ( ( x ^ i ) & 1 ) {
                        Cr = -Cr;
                        Cb = -Cb;
                  }

                  rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) +
                              500 ) / 900, 0, 255 );
                  rgb[1] = clamp( ( ( Y - ( 392 * Cb ) -
                                ( 813 * Cr ) ) +
                                500 ) / 1000, 0, 255 );
                  rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) +
                              500 ) / 1300, 0, 255 );

                  prevX = -1;
            }

            prevY = -512;
      }
}

static void
read_frame(struct vicam_camera *cam, int framenum)
{
      unsigned char *request = cam->cntrlbuf;
      int realShutter;
      int n;
      int actual_length;

      if (cam->needsDummyRead) {
            cam->needsDummyRead = 0;
            read_frame(cam, framenum);
      }

      memset(request, 0, 16);
      request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain

      request[1] = 0;   // 512x242 capture

      request[2] = 0x90;      // the function of these two bytes
      request[3] = 0x07;      // is not yet understood

      if (cam->shutter_speed > 60) {
            // Short exposure
            realShutter =
                ((-15631900 / cam->shutter_speed) + 260533) / 1000;
            request[4] = realShutter & 0xFF;
            request[5] = (realShutter >> 8) & 0xFF;
            request[6] = 0x03;
            request[7] = 0x01;
      } else {
            // Long exposure
            realShutter = 15600 / cam->shutter_speed - 1;
            request[4] = 0;
            request[5] = 0;
            request[6] = realShutter & 0xFF;
            request[7] = realShutter >> 8;
      }

      // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
      request[8] = 0;
      // bytes 9-15 do not seem to affect exposure or image quality

      mutex_lock(&cam->cam_lock);

      if (!cam->udev) {
            goto done;
      }

      n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);

      if (n < 0) {
            printk(KERN_ERR
                   " Problem sending frame capture control message");
            goto done;
      }

      n = usb_bulk_msg(cam->udev,
                   usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
                   cam->raw_image,
                   512 * 242 + 128, &actual_length, 10000);

      if (n < 0) {
            printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
                   n);
      }

 done:
      mutex_unlock(&cam->cam_lock);
}

static ssize_t
vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos )
{
      struct vicam_camera *cam = file->private_data;

      DBG("read %d bytes.\n", (int) count);

      if (*ppos >= VICAM_MAX_FRAME_SIZE) {
            *ppos = 0;
            return 0;
      }

      if (*ppos == 0) {
            read_frame(cam, 0);
            vicam_decode_color(cam->raw_image,
                           cam->framebuf +
                           0 * VICAM_MAX_FRAME_SIZE);
      }

      count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);

      if (copy_to_user(buf, &cam->framebuf[*ppos], count)) {
            count = -EFAULT;
      } else {
            *ppos += count;
      }

      if (count == VICAM_MAX_FRAME_SIZE) {
            *ppos = 0;
      }

      return count;
}


static int
vicam_mmap(struct file *file, struct vm_area_struct *vma)
{
      // TODO: allocate the raw frame buffer if necessary
      unsigned long page, pos;
      unsigned long start = vma->vm_start;
      unsigned long size  = vma->vm_end-vma->vm_start;
      struct vicam_camera *cam = file->private_data;

      if (!cam)
            return -ENODEV;

      DBG("vicam_mmap: %ld\n", size);

      /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
       * to the size the application requested for mmap and it was screwing apps up.
       if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
       return -EINVAL;
       */

      pos = (unsigned long)cam->framebuf;
      while (size > 0) {
            page = vmalloc_to_pfn((void *)pos);
            if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
                  return -EAGAIN;

            start += PAGE_SIZE;
            pos += PAGE_SIZE;
            if (size > PAGE_SIZE)
                  size -= PAGE_SIZE;
            else
                  size = 0;
      }

      return 0;
}

static const struct file_operations vicam_fops = {
      .owner            = THIS_MODULE,
      .open       = vicam_open,
      .release    = vicam_close,
      .read       = vicam_read,
      .mmap       = vicam_mmap,
      .ioctl            = vicam_ioctl,
      .compat_ioctl     = v4l_compat_ioctl32,
      .llseek           = no_llseek,
};

static struct video_device vicam_template = {
      .owner            = THIS_MODULE,
      .name             = "ViCam-based USB Camera",
      .type             = VID_TYPE_CAPTURE,
      .fops             = &vicam_fops,
      .minor            = -1,
};

/* table of devices that work with this driver */
static struct usb_device_id vicam_table[] = {
      {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
      {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
      {}                /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, vicam_table);

static struct usb_driver vicam_driver = {
      .name       = "vicam",
      .probe            = vicam_probe,
      .disconnect = vicam_disconnect,
      .id_table   = vicam_table
};

/**
 *    vicam_probe
 *    @intf: the interface
 *    @id: the device id
 *
 *    Called by the usb core when a new device is connected that it thinks
 *    this driver might be interested in.
 */
static int
vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
{
      struct usb_device *dev = interface_to_usbdev(intf);
      int bulkEndpoint = 0;
      const struct usb_host_interface *interface;
      const struct usb_endpoint_descriptor *endpoint;
      struct vicam_camera *cam;

      printk(KERN_INFO "ViCam based webcam connected\n");

      interface = intf->cur_altsetting;

      DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
             interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
      endpoint = &interface->endpoint[0].desc;

      if ((endpoint->bEndpointAddress & 0x80) &&
          ((endpoint->bmAttributes & 3) == 0x02)) {
            /* we found a bulk in endpoint */
            bulkEndpoint = endpoint->bEndpointAddress;
      } else {
            printk(KERN_ERR
                   "No bulk in endpoint was found ?! (this is bad)\n");
      }

      if ((cam =
           kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) {
            printk(KERN_WARNING
                   "could not allocate kernel memory for vicam_camera struct\n");
            return -ENOMEM;
      }


      cam->shutter_speed = 15;

      mutex_init(&cam->cam_lock);

      memcpy(&cam->vdev, &vicam_template,
             sizeof (vicam_template));
      cam->vdev.priv = cam;   // sort of a reverse mapping for those functions that get vdev only

      cam->udev = dev;
      cam->bulkEndpoint = bulkEndpoint;

      if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) == -1) {
            kfree(cam);
            printk(KERN_WARNING "video_register_device failed\n");
            return -EIO;
      }

      printk(KERN_INFO "ViCam webcam driver now controlling video device %d\n",cam->vdev.minor);

      usb_set_intfdata (intf, cam);

      return 0;
}

static void
vicam_disconnect(struct usb_interface *intf)
{
      int open_count;
      struct vicam_camera *cam = usb_get_intfdata (intf);
      usb_set_intfdata (intf, NULL);

      /* we must unregister the device before taking its
       * cam_lock. This is because the video open call
       * holds the same lock as video unregister. if we
       * unregister inside of the cam_lock and open also
       * uses the cam_lock, we get deadlock.
       */

      video_unregister_device(&cam->vdev);

      /* stop the camera from being used */

      mutex_lock(&cam->cam_lock);

      /* mark the camera as gone */

      cam->udev = NULL;

      /* the only thing left to do is synchronize with
       * our close/release function on who should release
       * the camera memory. if there are any users using the
       * camera, it's their job. if there are no users,
       * it's ours.
       */

      open_count = cam->open_count;

      mutex_unlock(&cam->cam_lock);

      if (!open_count) {
            kfree(cam);
      }

      printk(KERN_DEBUG "ViCam-based WebCam disconnected\n");
}

/*
 */
static int __init
usb_vicam_init(void)
{
      int retval;
      DBG(KERN_INFO "ViCam-based WebCam driver startup\n");
      retval = usb_register(&vicam_driver);
      if (retval)
            printk(KERN_WARNING "usb_register failed!\n");
      return retval;
}

static void __exit
usb_vicam_exit(void)
{
      DBG(KERN_INFO
             "ViCam-based WebCam driver shutdown\n");

      usb_deregister(&vicam_driver);
}

module_init(usb_vicam_init);
module_exit(usb_vicam_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

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