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 <royale@zerezo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

3 files changed, 942 insertions, 0 deletions

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 7a6105153f23..fa0a87679190 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -761,6 +761,18 @@ source "drivers/media/video/zc0301/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
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index 44ccaed40b49..384f01c133c5 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -99,6 +99,7 @@ obj-$(CONFIG_USB_OV511)         += ov511.o
 obj-$(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/
diff --git a/drivers/media/video/zr364xx.c b/drivers/media/video/zr364xx.c
new file mode 100644
index 000000000000..c055cf017cf5
--- /dev/null
+++ b/drivers/media/video/zr364xx.c
@@ -0,0 +1,929 @@
+/*
+ * 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 <royale@zerezo.com>
+ * 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");