V4L/DVB (5257): USB: add zr364xx V4L2 driver

This patch adds a V4L2 driver giving support for USB webcams based on the
zr364xx chipsets.

Signed-off-by: Antoine Jacquet <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/video4linux/zr364xx.txt

···
+Zoran 364xx based USB webcam module version 0.72
+site: http://royale.zerezo.com/zr364xx/
+mail: [e-mail]
+
+introduction:
+This brings support under Linux for the Aiptek PocketDV 3300 in webcam mode.
+If you just want to get on your PC the pictures and movies on the camera, you should use the usb-storage module instead.
+The driver works with several other cameras in webcam mode (see the list below).
+Maybe this code can work for other JPEG/USB cams based on the Coach chips from Zoran?
+Possible chipsets are : ZR36430 (ZR36430BGC) and maybe ZR36431, ZR36440, ZR36442...
+You can try the experience changing the vendor/product ID values (look at the source code).
+You can get these values by looking at /var/log/messages when you plug your camera, or by typing : cat /proc/bus/usb/devices.
+If you manage to use your cam with this code, you can send me a mail ([e-mail]) with the name of your cam and a patch if needed.
+This is a beta release of the driver.
+Since version 0.70, this driver is only compatible with V4L2 API and 2.6.x kernels.
+If you need V4L1 or 2.4x kernels support, please use an older version, but the code is not maintained anymore.
+Good luck!
+
+install:
+In order to use this driver, you must compile it with your kernel.
+Location: Device Drivers -> Multimedia devices -> Video For Linux -> Video Capture Adapters -> V4L USB devices
+
+usage:
+modprobe zr364xx debug=X mode=Y
+ - debug      : set to 1 to enable verbose debug messages
+ - mode       : 0 = 320x240, 1 = 160x120, 2 = 640x480
+You can then use the camera with V4L2 compatible applications, for example Ekiga.
+To capture a single image, try this: dd if=/dev/video0 of=test.jpg bs=1 count=1
+
+links :
+http://mxhaard.free.fr/ (support for many others cams including some Aiptek PocketDV)
+http://www.harmwal.nl/pccam880/ (this project also supports cameras based on this chipset)
+
+supported devices:
+------  -------  -----------     -----
+Vendor  Product  Distributor     Model
+------  -------  -----------     -----
+0x08ca  0x0109   Aiptek          PocketDV 3300
+0x08ca  0x0109   Maxell          Maxcam PRO DV3
+0x041e  0x4024   Creative        PC-CAM 880
+0x0d64  0x0108   Aiptek          Fidelity 3200
+0x0d64  0x0108   Praktica        DCZ 1.3 S
+0x0d64  0x0108   Genius          Digital Camera (?)
+0x0d64  0x0108   DXG Technology  Fashion Cam
+0x0546  0x3187   Polaroid        iON 230
+0x0d64  0x3108   Praktica        Exakta DC 2200
+0x0d64  0x3108   Genius          G-Shot D211
+0x0595  0x4343   Concord         Eye-Q Duo 1300
+0x0595  0x4343   Concord         Eye-Q Duo 2000
+0x0595  0x4343   Fujifilm        EX-10
+0x0595  0x4343   Ricoh           RDC-6000
+0x0595  0x4343   Digitrex        DSC 1300
+0x0595  0x4343   Firstline       FDC 2000
+0x0bb0  0x500d   Concord         EyeQ Go Wireless
+0x0feb  0x2004   CRS Electronic  3.3 Digital Camera
+0x0feb  0x2004   Packard Bell    DSC-300
+0x055f  0xb500   Mustek          MDC 3000
+0x08ca  0x2062   Aiptek          PocketDV 5700
+0x052b  0x1a18   Chiphead        Megapix V12
+0x04c8  0x0729   Konica          Revio 2
+0x04f2  0xa208   Creative        PC-CAM 850
+0x0784  0x0040   Traveler        Slimline X5
+0x06d6  0x0034   Trust           Powerc@m 750
+0x0a17  0x0062   Pentax          Optio 50L
+

MAINTAINERS

···
 
 8.	Happy hacking.
 
- 		-----------------------------------
+		-----------------------------------
 
 Maintainers List (try to look for most precise areas first)
 
···
 L:	[e-mail]
 W:	http://us1.samba.org/samba/Linux_CIFS_client.html
 T:	git kernel.org:/pub/scm/linux/kernel/git/sfrench/cifs-2.6.git
-S:	Supported	
+S:	Supported
 
 CONFIGFS
 P:	Joel Becker
···
 M:	[e-mail]
 L:	[e-mail]
 S:	Maintained
- 
+
 HEWLETT-PACKARD SMART2 RAID DRIVER
 P:	Chirag Kantharia
 M:	[e-mail]
 L:	[e-mail]
 S:	Maintained
- 
+
 HEWLETT-PACKARD SMART CISS RAID DRIVER (cciss)
 P:	Mike Miller
 M:	[e-mail]
 L:	[e-mail]
 S:	Supported
- 
+
 HOST AP DRIVER
 P:	Jouni Malinen
 M:	[e-mail]
···
 P:	Dave Jeffery
 M:	[e-mail]
 W:	http://www.developer.ibm.com/welcome/netfinity/serveraid.html
-S:	Supported 
+S:	Supported
 
 IDE SUBSYSTEM
 P:	Bartlomiej Zolnierkiewicz
···
 P:	Sam Ravnborg
 M:	[e-mail]
 T:	git kernel.org:/pub/scm/linux/kernel/git/sam/kbuild.git
-S:	Maintained 
+S:	Maintained
 
 KERNEL JANITORS
 P:	Several
···
 LOGICAL DISK MANAGER SUPPORT (LDM, Windows 2000/XP Dynamic Disks)
 P:	Richard Russon (FlatCap)
 M:	[e-mail]
-L:	[e-mail]	
+L:	[e-mail]
 W:	http://ldm.sourceforge.net
 S:	Maintained
 
···
 M:	[e-mail]
 L:	[e-mail]
 W:	http://oss.oracle.com/projects/ocfs2/
-S:	Supported	
+S:	Supported
 
 OLYMPIC NETWORK DRIVER
 P:	Peter De Shrijver
 M:	[e-mail]
 P:	Mike Phillips
-M:	[e-mail] 
+M:	[e-mail]
 L:	[e-mail]
 L:	[e-mail]
 W:	http://www.linuxtr.net
···
 P:	Thomas Winischhofer
 M:	[e-mail]
 W:	http://www.winischhofer.net/linuxsisvga.shtml
-S:	Maintained	
+S:	Maintained
 
 SIS USB2VGA DRIVER
 P:	Thomas Winischhofer
···
 W:	http://linux-lc100020.sourceforge.net
 S:	Maintained
 
+USB ZR364XX DRIVER
+P:	Antoine Jacquet
+M:	[e-mail]
+L:	[e-mail]
+L:	[e-mail]
+W:	http://royale.zerezo.com/zr364xx/
+S:	Maintained
+
 USER-MODE LINUX
 P:	Jeff Dike
 M:	[e-mail]
···
 L:	[e-mail]
 W:	http://user-mode-linux.sourceforge.net
 S:	Maintained
-	
+
 FAT/VFAT/MSDOS FILESYSTEM:
 P:	OGAWA Hirofumi
 M:	[e-mail]

drivers/media/video/Kconfig

···
 
 source "drivers/media/video/pwc/Kconfig"
 
+config USB_ZR364XX
+	tristate "USB ZR364XX Camera support"
+	depends on USB && VIDEO_V4L2
+	---help---
+	  Say Y here if you want to connect this type of camera to your
+	  computer's USB port.
+	  See <file:Documentation/video4linux/zr364xx.txt> for more info
+	  and list of supported cameras.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called zr364xx.
+
 endmenu # V4L USB devices
 
 endmenu

drivers/media/video/Makefile

···
 obj-$(CONFIG_USB_SE401)         += se401.o
 obj-$(CONFIG_USB_STV680)        += stv680.o
 obj-$(CONFIG_USB_W9968CF)       += w9968cf.o
+obj-$(CONFIG_USB_ZR364XX)       += zr364xx.o
 
 obj-$(CONFIG_USB_SN9C102)       += sn9c102/
 obj-$(CONFIG_USB_ET61X251)      += et61x251/

drivers/media/video/zr364xx.c

···
+/*
+ * Zoran 364xx based USB webcam module version 0.72
+ *
+ * Allows you to use your USB webcam with V4L2 applications
+ * This is still in heavy developpement !
+ *
+ * Copyright (C) 2004  Antoine Jacquet <[e-mail]>
+ * http://royale.zerezo.com/zr364xx/
+ *
+ * Heavily inspired by usb-skeleton.c, vicam.c, cpia.c and spca50x.c drivers
+ * V4L2 version inspired by meye.c driver
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/proc_fs.h>
+#include <media/v4l2-common.h>
+
+
+/* Version Information */
+#define DRIVER_VERSION "v0.72"
+#define DRIVER_AUTHOR "Antoine Jacquet, http://royale.zerezo.com/"
+#define DRIVER_DESC "Zoran 364xx"
+
+
+/* Camera */
+#define FRAMES 2
+#define MAX_FRAME_SIZE 100000
+#define BUFFER_SIZE 0x1000
+#define CTRL_TIMEOUT 500
+
+
+/* Debug macro */
+#define DBG(x...) if (debug) info(x)
+
+
+/* Init methods, need to find nicer names for these
+ * the exact names of the chipsets would be the best if someone finds it */
+#define METHOD0 0
+#define METHOD1 1
+#define METHOD2 2
+
+
+/* Module parameters */
+static int debug = 0;
+static int mode = 0;
+
+
+/* Module parameters interface */
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug level");
+module_param(mode, int, 0644);
+MODULE_PARM_DESC(mode, "0 = 320x240, 1 = 160x120, 2 = 640x480");
+
+
+/* Devices supported by this driver
+ * .driver_info contains the init method used by the camera */
+static struct usb_device_id device_table[] = {
+	{USB_DEVICE(0x08ca, 0x0109), .driver_info = METHOD0 },
+	{USB_DEVICE(0x041e, 0x4024), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0d64, 0x0108), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0546, 0x3187), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0d64, 0x3108), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0595, 0x4343), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0bb0, 0x500d), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0feb, 0x2004), .driver_info = METHOD0 },
+	{USB_DEVICE(0x055f, 0xb500), .driver_info = METHOD0 },
+	{USB_DEVICE(0x08ca, 0x2062), .driver_info = METHOD2 },
+	{USB_DEVICE(0x052b, 0x1a18), .driver_info = METHOD1 },
+	{USB_DEVICE(0x04c8, 0x0729), .driver_info = METHOD0 },
+	{USB_DEVICE(0x04f2, 0xa208), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0784, 0x0040), .driver_info = METHOD1 },
+	{USB_DEVICE(0x06d6, 0x0034), .driver_info = METHOD0 },
+	{USB_DEVICE(0x0a17, 0x0062), .driver_info = METHOD2 },
+	{}			/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, device_table);
+
+
+/* Camera stuff */
+struct zr364xx_camera {
+	struct usb_device *udev;	/* save off the usb device pointer */
+	struct usb_interface *interface;/* the interface for this device */
+	struct video_device *vdev;	/* v4l video device */
+	u8 *framebuf;
+	int nb;
+	unsigned char *buffer;
+	int skip;
+	int brightness;
+	int width;
+	int height;
+	int method;
+	struct mutex lock;
+};
+
+
+/* function used to send initialisation commands to the camera */
+static int send_control_msg(struct usb_device *udev, u8 request, u16 value,
+			    u16 index, unsigned char *cp, u16 size)
+{
+	int status;
+
+	unsigned char *transfer_buffer = kmalloc(size, GFP_KERNEL);
+	if (!transfer_buffer) {
+		info("kmalloc(%d) failed", size);
+		return -ENOMEM;
+	}
+
+	memcpy(transfer_buffer, cp, size);
+
+	status = usb_control_msg(udev,
+				 usb_sndctrlpipe(udev, 0),
+				 request,
+				 USB_DIR_OUT | USB_TYPE_VENDOR |
+				 USB_RECIP_DEVICE, value, index,
+				 transfer_buffer, size, CTRL_TIMEOUT);
+
+	kfree(transfer_buffer);
+
+	if (status < 0)
+		info("Failed sending control message, error %d.", status);
+
+	return status;
+}
+
+
+/* Control messages sent to the camera to initialize it
+ * and launch the capture */
+typedef struct {
+	unsigned int value;
+	unsigned int size;
+	unsigned char *bytes;
+} message;
+
+/* method 0 */
+static unsigned char m0d1[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+static unsigned char m0d2[] = { 0, 0, 0, 0, 0, 0 };
+static unsigned char m0d3[] = { 0, 0 };
+static message m0[] = {
+	{0x1f30, 0, NULL},
+	{0xd000, 0, NULL},
+	{0x3370, sizeof(m0d1), m0d1},
+	{0x2000, 0, NULL},
+	{0x2f0f, 0, NULL},
+	{0x2610, sizeof(m0d2), m0d2},
+	{0xe107, 0, NULL},
+	{0x2502, 0, NULL},
+	{0x1f70, 0, NULL},
+	{0xd000, 0, NULL},
+	{0x9a01, sizeof(m0d3), m0d3},
+	{-1, -1, NULL}
+};
+
+/* method 1 */
+static unsigned char m1d1[] = { 0xff, 0xff };
+static unsigned char m1d2[] = { 0x00, 0x00 };
+static message m1[] = {
+	{0x1f30, 0, NULL},
+	{0xd000, 0, NULL},
+	{0xf000, 0, NULL},
+	{0x2000, 0, NULL},
+	{0x2f0f, 0, NULL},
+	{0x2650, 0, NULL},
+	{0xe107, 0, NULL},
+	{0x2502, sizeof(m1d1), m1d1},
+	{0x1f70, 0, NULL},
+	{0xd000, 0, NULL},
+	{0xd000, 0, NULL},
+	{0xd000, 0, NULL},
+	{0x9a01, sizeof(m1d2), m1d2},
+	{-1, -1, NULL}
+};
+
+/* method 2 */
+static unsigned char m2d1[] = { 0xff, 0xff };
+static message m2[] = {
+	{0x1f30, 0, NULL},
+	{0xf000, 0, NULL},
+	{0x2000, 0, NULL},
+	{0x2f0f, 0, NULL},
+	{0x2650, 0, NULL},
+	{0xe107, 0, NULL},
+	{0x2502, sizeof(m2d1), m2d1},
+	{0x1f70, 0, NULL},
+	{-1, -1, NULL}
+};
+
+/* init table */
+static message *init[3] = { m0, m1, m2 };
+
+
+/* JPEG static data in header (Huffman table, etc) */
+static unsigned char header1[] = {
+	0xFF, 0xD8,
+	/*
+	0xFF, 0xE0, 0x00, 0x10, 'J', 'F', 'I', 'F',
+	0x00, 0x01, 0x01, 0x00, 0x33, 0x8A, 0x00, 0x00, 0x33, 0x88,
+	*/
+	0xFF, 0xDB, 0x00, 0x84
+};
+static unsigned char header2[] = {
+	0xFF, 0xC4, 0x00, 0x1F, 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01,
+	0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
+	0xFF, 0xC4, 0x00, 0xB5, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, 0x02,
+	0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D, 0x01,
+	0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06,
+	0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1,
+	0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0, 0x24, 0x33,
+	0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25,
+	0x26, 0x27, 0x28, 0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+	0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54,
+	0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67,
+	0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A,
+	0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94,
+	0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6,
+	0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8,
+	0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA,
+	0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
+	0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3,
+	0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFF, 0xC4, 0x00, 0x1F,
+	0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+	0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04,
+	0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0xFF, 0xC4, 0x00, 0xB5,
+	0x11, 0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05,
+	0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11,
+	0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+	0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1,
+	0x09, 0x23, 0x33, 0x52, 0xF0, 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16,
+	0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26, 0x27,
+	0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44,
+	0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57,
+	0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
+	0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84,
+	0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96,
+	0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
+	0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA,
+	0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3,
+	0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE2, 0xE3, 0xE4, 0xE5,
+	0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
+	0xF8, 0xF9, 0xFA, 0xFF, 0xC0, 0x00, 0x11, 0x08, 0x00, 0xF0, 0x01,
+	0x40, 0x03, 0x01, 0x21, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01,
+	0xFF, 0xDA, 0x00, 0x0C, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11,
+	0x00, 0x3F, 0x00
+};
+static unsigned char header3;
+
+
+
+/********************/
+/* V4L2 integration */
+/********************/
+
+/* this function reads a full JPEG picture synchronously
+ * TODO: do it asynchronously... */
+static int read_frame(struct zr364xx_camera *cam, int framenum)
+{
+	int i, n, temp, head, size, actual_length;
+	unsigned char *ptr = NULL, *jpeg, swap;
+
+      redo:
+	/* hardware brightness */
+	n = send_control_msg(cam->udev, 1, 0x2001, 0, NULL, 0);
+	temp = (0x60 << 8) + 127 - cam->brightness;
+	n = send_control_msg(cam->udev, 1, temp, 0, NULL, 0);
+
+	/* during the first loop we are going to insert JPEG header */
+	head = 0;
+	/* this is the place in memory where we are going to build
+	 * the JPEG image */
+	jpeg = cam->framebuf + framenum * MAX_FRAME_SIZE;
+	/* read data... */
+	do {
+		n = usb_bulk_msg(cam->udev,
+				 usb_rcvbulkpipe(cam->udev, 0x81),
+				 cam->buffer, BUFFER_SIZE, &actual_length,
+				 CTRL_TIMEOUT);
+		DBG("buffer : %d %d", cam->buffer[0], cam->buffer[1]);
+		DBG("bulk : n=%d size=%d", n, actual_length);
+		if (n < 0) {
+			info("error reading bulk msg");
+			return 0;
+		}
+		if (actual_length < 0 || actual_length > BUFFER_SIZE) {
+			info("wrong number of bytes");
+			return 0;
+		}
+
+		/* swap bytes if camera needs it */
+		if (cam->method == METHOD0)
+			for (i = 0; i < BUFFER_SIZE; i += 2) {
+				swap = cam->buffer[i];
+				cam->buffer[i] = cam->buffer[i + 1];
+				cam->buffer[i + 1] = swap;
+			}
+
+		/* write the JPEG header */
+		if (!head) {
+			DBG("jpeg header");
+			ptr = jpeg;
+			memcpy(ptr, header1, sizeof(header1));
+			ptr += sizeof(header1);
+			header3 = 0;
+			memcpy(ptr, &header3, 1);
+			ptr++;
+			memcpy(ptr, cam->buffer, 64);
+			ptr += 64;
+			header3 = 1;
+			memcpy(ptr, &header3, 1);
+			ptr++;
+			memcpy(ptr, cam->buffer + 64, 64);
+			ptr += 64;
+			memcpy(ptr, header2, sizeof(header2));
+			ptr += sizeof(header2);
+			memcpy(ptr, cam->buffer + 128,
+			       actual_length - 128);
+			ptr += actual_length - 128;
+			head = 1;
+			DBG("header : %d %d %d %d %d %d %d %d %d",
+			    cam->buffer[0], cam->buffer[1], cam->buffer[2],
+			    cam->buffer[3], cam->buffer[4], cam->buffer[5],
+			    cam->buffer[6], cam->buffer[7], cam->buffer[8]);
+		} else {
+			memcpy(ptr, cam->buffer, actual_length);
+			ptr += actual_length;
+		}
+	}
+	/* ... until there is no more */
+	while (actual_length == BUFFER_SIZE);
+
+	/* we skip the 2 first frames which are usually buggy */
+	if (cam->skip) {
+		cam->skip--;
+		goto redo;
+	}
+
+	/* go back to find the JPEG EOI marker */
+	size = ptr - jpeg;
+	ptr -= 2;
+	while (ptr > jpeg) {
+		if (*ptr == 0xFF && *(ptr + 1) == 0xD9
+		    && *(ptr + 2) == 0xFF)
+			break;
+		ptr--;
+	}
+	if (ptr == jpeg)
+		DBG("No EOI marker");
+
+	/* Sometimes there is junk data in the middle of the picture,
+	 * we want to skip this bogus frames */
+	while (ptr > jpeg) {
+		if (*ptr == 0xFF && *(ptr + 1) == 0xFF
+		    && *(ptr + 2) == 0xFF)
+			break;
+		ptr--;
+	}
+	if (ptr != jpeg) {
+		DBG("Bogus frame ? %d", cam->nb);
+		goto redo;
+	}
+
+	DBG("jpeg : %d %d %d %d %d %d %d %d",
+	    jpeg[0], jpeg[1], jpeg[2], jpeg[3],
+	    jpeg[4], jpeg[5], jpeg[6], jpeg[7]);
+
+	return size;
+}
+
+
+static ssize_t zr364xx_read(struct file *file, char *buf, size_t cnt,
+			    loff_t * ppos)
+{
+	unsigned long count = cnt;
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	DBG("zr364xx_read: read %d bytes.", (int) count);
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	if (!buf)
+		return -EINVAL;
+
+	if (!count)
+		return -EINVAL;
+
+	/* NoMan Sux ! */
+	count = read_frame(cam, 0);
+
+	if (copy_to_user(buf, cam->framebuf, count))
+		return -EFAULT;
+
+	return count;
+}
+
+
+static int zr364xx_vidioc_querycap(struct file *file, void *priv,
+				   struct v4l2_capability *cap)
+{
+	memset(cap, 0, sizeof(*cap));
+	strcpy(cap->driver, DRIVER_DESC);
+	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
+	return 0;
+}
+
+static int zr364xx_vidioc_enum_input(struct file *file, void *priv,
+				     struct v4l2_input *i)
+{
+	if (i->index != 0)
+		return -EINVAL;
+	memset(i, 0, sizeof(*i));
+	i->index = 0;
+	strcpy(i->name, DRIVER_DESC " Camera");
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+	return 0;
+}
+
+static int zr364xx_vidioc_g_input(struct file *file, void *priv,
+				  unsigned int *i)
+{
+	*i = 0;
+	return 0;
+}
+
+static int zr364xx_vidioc_s_input(struct file *file, void *priv,
+				  unsigned int i)
+{
+	if (i != 0)
+		return -EINVAL;
+	return 0;
+}
+
+static int zr364xx_vidioc_queryctrl(struct file *file, void *priv,
+				    struct v4l2_queryctrl *c)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	switch (c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		c->type = V4L2_CTRL_TYPE_INTEGER;
+		strcpy(c->name, "Brightness");
+		c->minimum = 0;
+		c->maximum = 127;
+		c->step = 1;
+		c->default_value = cam->brightness;
+		c->flags = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int zr364xx_vidioc_s_ctrl(struct file *file, void *priv,
+				 struct v4l2_control *c)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	switch (c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		cam->brightness = c->value;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int zr364xx_vidioc_g_ctrl(struct file *file, void *priv,
+				 struct v4l2_control *c)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	switch (c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		c->value = cam->brightness;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int zr364xx_vidioc_enum_fmt_cap(struct file *file,
+				       void *priv, struct v4l2_fmtdesc *f)
+{
+	if (f->index > 0)
+		return -EINVAL;
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	memset(f, 0, sizeof(*f));
+	f->index = 0;
+	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	f->flags = V4L2_FMT_FLAG_COMPRESSED;
+	strcpy(f->description, "JPEG");
+	f->pixelformat = V4L2_PIX_FMT_JPEG;
+	return 0;
+}
+
+static int zr364xx_vidioc_try_fmt_cap(struct file *file, void *priv,
+				      struct v4l2_format *f)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG)
+		return -EINVAL;
+	if (f->fmt.pix.field != V4L2_FIELD_ANY &&
+	    f->fmt.pix.field != V4L2_FIELD_NONE)
+		return -EINVAL;
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.width = cam->width;
+	f->fmt.pix.height = cam->height;
+	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
+	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace = 0;
+	f->fmt.pix.priv = 0;
+	return 0;
+}
+
+static int zr364xx_vidioc_g_fmt_cap(struct file *file, void *priv,
+				    struct v4l2_format *f)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	memset(&f->fmt.pix, 0, sizeof(struct v4l2_pix_format));
+	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	f->fmt.pix.pixelformat = V4L2_PIX_FMT_JPEG;
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.width = cam->width;
+	f->fmt.pix.height = cam->height;
+	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
+	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace = 0;
+	f->fmt.pix.priv = 0;
+	return 0;
+}
+
+static int zr364xx_vidioc_s_fmt_cap(struct file *file, void *priv,
+				    struct v4l2_format *f)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG)
+		return -EINVAL;
+	if (f->fmt.pix.field != V4L2_FIELD_ANY &&
+	    f->fmt.pix.field != V4L2_FIELD_NONE)
+		return -EINVAL;
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.width = cam->width;
+	f->fmt.pix.height = cam->height;
+	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
+	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace = 0;
+	f->fmt.pix.priv = 0;
+	DBG("ok!");
+	return 0;
+}
+
+static int zr364xx_vidioc_streamon(struct file *file, void *priv,
+				   enum v4l2_buf_type type)
+{
+	return 0;
+}
+
+static int zr364xx_vidioc_streamoff(struct file *file, void *priv,
+				    enum v4l2_buf_type type)
+{
+	return 0;
+}
+
+
+/* open the camera */
+static int zr364xx_open(struct inode *inode, struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam = video_get_drvdata(vdev);
+	struct usb_device *udev = cam->udev;
+	int i, err;
+
+	DBG("zr364xx_open");
+
+	cam->skip = 2;
+
+	err = video_exclusive_open(inode, file);
+	if (err < 0)
+		return err;
+
+	if (!cam->framebuf) {
+		cam->framebuf = vmalloc_32(MAX_FRAME_SIZE * FRAMES);
+		if (!cam->framebuf) {
+			info("vmalloc_32 failed!");
+			return -ENOMEM;
+		}
+	}
+
+	mutex_lock(&cam->lock);
+	for (i = 0; init[cam->method][i].size != -1; i++) {
+		err =
+		    send_control_msg(udev, 1, init[cam->method][i].value,
+				     0, init[cam->method][i].bytes,
+				     init[cam->method][i].size);
+		if (err < 0) {
+			info("error during open sequence: %d", i);
+			mutex_unlock(&cam->lock);
+			return err;
+		}
+	}
+
+	file->private_data = vdev;
+
+	/* Added some delay here, since opening/closing the camera quickly,
+	 * like Ekiga does during its startup, can crash the webcam
+	 */
+	mdelay(100);
+
+	mutex_unlock(&cam->lock);
+	return 0;
+}
+
+
+/* release the camera */
+static int zr364xx_release(struct inode *inode, struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+	struct usb_device *udev;
+	int i, err;
+
+	DBG("zr364xx_release");
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	udev = cam->udev;
+
+	mutex_lock(&cam->lock);
+	for (i = 0; i < 2; i++) {
+		err =
+		    send_control_msg(udev, 1, init[cam->method][i].value,
+				     0, init[i][cam->method].bytes,
+				     init[cam->method][i].size);
+		if (err < 0) {
+			info("error during release sequence");
+			mutex_unlock(&cam->lock);
+			return err;
+		}
+	}
+
+	file->private_data = NULL;
+	video_exclusive_release(inode, file);
+
+	/* Added some delay here, since opening/closing the camera quickly,
+	 * like Ekiga does during its startup, can crash the webcam
+	 */
+	mdelay(100);
+
+	mutex_unlock(&cam->lock);
+	return 0;
+}
+
+
+static int zr364xx_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	void *pos;
+	unsigned long start = vma->vm_start;
+	unsigned long size = vma->vm_end - vma->vm_start;
+	struct video_device *vdev = video_devdata(file);
+	struct zr364xx_camera *cam;
+
+	DBG("zr364xx_mmap: %ld\n", size);
+
+	if (vdev == NULL)
+		return -ENODEV;
+	cam = video_get_drvdata(vdev);
+
+	pos = cam->framebuf;
+	while (size > 0) {
+		if (vm_insert_page(vma, start, vmalloc_to_page(pos)))
+			return -EAGAIN;
+		start += PAGE_SIZE;
+		pos += PAGE_SIZE;
+		if (size > PAGE_SIZE)
+			size -= PAGE_SIZE;
+		else
+			size = 0;
+	}
+
+	return 0;
+}
+
+
+static struct file_operations zr364xx_fops = {
+	.owner = THIS_MODULE,
+	.open = zr364xx_open,
+	.release = zr364xx_release,
+	.read = zr364xx_read,
+	.mmap = zr364xx_mmap,
+	.ioctl = video_ioctl2,
+	.llseek = no_llseek,
+};
+
+static struct video_device zr364xx_template = {
+	.owner = THIS_MODULE,
+	.name = DRIVER_DESC,
+	.type = VID_TYPE_CAPTURE,
+	.fops = &zr364xx_fops,
+	.release = video_device_release,
+	.minor = -1,
+
+	.vidioc_querycap	= zr364xx_vidioc_querycap,
+	.vidioc_enum_fmt_cap	= zr364xx_vidioc_enum_fmt_cap,
+	.vidioc_try_fmt_cap	= zr364xx_vidioc_try_fmt_cap,
+	.vidioc_s_fmt_cap	= zr364xx_vidioc_s_fmt_cap,
+	.vidioc_g_fmt_cap	= zr364xx_vidioc_g_fmt_cap,
+	.vidioc_enum_input	= zr364xx_vidioc_enum_input,
+	.vidioc_g_input		= zr364xx_vidioc_g_input,
+	.vidioc_s_input		= zr364xx_vidioc_s_input,
+	.vidioc_streamon	= zr364xx_vidioc_streamon,
+	.vidioc_streamoff	= zr364xx_vidioc_streamoff,
+	.vidioc_queryctrl	= zr364xx_vidioc_queryctrl,
+	.vidioc_g_ctrl		= zr364xx_vidioc_g_ctrl,
+	.vidioc_s_ctrl		= zr364xx_vidioc_s_ctrl,
+};
+
+
+
+/*******************/
+/* USB integration */
+/*******************/
+
+static int zr364xx_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct zr364xx_camera *cam = NULL;
+
+	DBG("probing...");
+
+	info(DRIVER_DESC " compatible webcam plugged");
+	info("model %04x:%04x detected", udev->descriptor.idVendor,
+	     udev->descriptor.idProduct);
+
+	if ((cam =
+	     kmalloc(sizeof(struct zr364xx_camera), GFP_KERNEL)) == NULL) {
+		info("cam: out of memory !");
+		return -ENODEV;
+	}
+	memset(cam, 0x00, sizeof(struct zr364xx_camera));
+	/* save the init method used by this camera */
+	cam->method = id->driver_info;
+
+	cam->vdev = video_device_alloc();
+	if (cam->vdev == NULL) {
+		info("cam->vdev: out of memory !");
+		kfree(cam);
+		return -ENODEV;
+	}
+	memcpy(cam->vdev, &zr364xx_template, sizeof(zr364xx_template));
+	video_set_drvdata(cam->vdev, cam);
+	if (debug)
+		cam->vdev->debug = V4L2_DEBUG_IOCTL | V4L2_DEBUG_IOCTL_ARG;
+
+	cam->udev = udev;
+
+	if ((cam->buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL)) == NULL) {
+		info("cam->buffer: out of memory !");
+		video_device_release(cam->vdev);
+		kfree(cam);
+		return -ENODEV;
+	}
+
+	switch (mode) {
+	case 1:
+		info("160x120 mode selected");
+		cam->width = 160;
+		cam->height = 120;
+		break;
+	case 2:
+		info("640x480 mode selected");
+		cam->width = 640;
+		cam->height = 480;
+		break;
+	default:
+		info("320x240 mode selected");
+		cam->width = 320;
+		cam->height = 240;
+		break;
+	}
+
+	m0d1[0] = mode;
+	m1[2].value = 0xf000 + mode;
+	m2[1].value = 0xf000 + mode;
+	header2[437] = cam->height / 256;
+	header2[438] = cam->height % 256;
+	header2[439] = cam->width / 256;
+	header2[440] = cam->width % 256;
+
+	cam->nb = 0;
+	cam->brightness = 64;
+	mutex_init(&cam->lock);
+
+	if (video_register_device(cam->vdev, VFL_TYPE_GRABBER, -1) == -1) {
+		info("video_register_device failed");
+		video_device_release(cam->vdev);
+		kfree(cam->buffer);
+		kfree(cam);
+		return -ENODEV;
+	}
+
+	usb_set_intfdata(intf, cam);
+
+	info(DRIVER_DESC " controlling video device %d", cam->vdev->minor);
+	return 0;
+}
+
+
+static void zr364xx_disconnect(struct usb_interface *intf)
+{
+	struct zr364xx_camera *cam = usb_get_intfdata(intf);
+	usb_set_intfdata(intf, NULL);
+	dev_set_drvdata(&intf->dev, NULL);
+	info(DRIVER_DESC " webcam unplugged");
+	if (cam->vdev)
+		video_unregister_device(cam->vdev);
+	cam->vdev = NULL;
+	kfree(cam->buffer);
+	if (cam->framebuf)
+		vfree(cam->framebuf);
+	kfree(cam);
+}
+
+
+
+/**********************/
+/* Module integration */
+/**********************/
+
+static struct usb_driver zr364xx_driver = {
+	.name = "zr364xx",
+	.probe = zr364xx_probe,
+	.disconnect = zr364xx_disconnect,
+	.id_table = device_table
+};
+
+
+static int __init zr364xx_init(void)
+{
+	int retval;
+	retval = usb_register(&zr364xx_driver) < 0;
+	if (retval)
+		info("usb_register failed!");
+	else
+		info(DRIVER_DESC " module loaded");
+	return retval;
+}
+
+
+static void __exit zr364xx_exit(void)
+{
+	info(DRIVER_DESC " module unloaded");
+	usb_deregister(&zr364xx_driver);
+}
+
+
+module_init(zr364xx_init);
+module_exit(zr364xx_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");