/* * 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 #include #include #include #include #include #include #include #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, 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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, .hardware = VID_HARDWARE_VICAM, .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 = kmalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) { printk(KERN_WARNING "could not allocate kernel memory for vicam_camera struct\n"); return -ENOMEM; } memset(cam, 0, sizeof (struct vicam_camera)); 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");