mirror of https://gitee.com/openkylin/linux.git
953 lines
21 KiB
C
953 lines
21 KiB
C
/*
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* USB ViCam WebCam driver
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* Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
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* Christopher L Cheney (ccheney@cheney.cx),
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* Pavel Machek (pavel@suse.cz),
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* John Tyner (jtyner@cs.ucr.edu),
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* Monroe Williams (monroe@pobox.com)
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*
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* Supports 3COM HomeConnect PC Digital WebCam
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* Supports Compro PS39U WebCam
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* This source code is based heavily on the CPiA webcam driver which was
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* written by Peter Pregler, Scott J. Bertin and Johannes Erdfelt
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*
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* Portions of this code were also copied from usbvideo.c
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*
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* Special thanks to the whole team at Sourceforge for help making
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* this driver become a reality. Notably:
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* Andy Armstrong who reverse engineered the color encoding and
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* Pavel Machek and Chris Cheney who worked on reverse engineering the
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* camera controls and wrote the first generation driver.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/videodev.h>
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#include <linux/usb.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/firmware.h>
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#include <linux/ihex.h>
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#include "usbvideo.h"
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// #define VICAM_DEBUG
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#ifdef VICAM_DEBUG
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#define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args)
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#define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args)
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#else
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#define DBG(fmn,args...) do {} while(0)
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#endif
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#define DRIVER_AUTHOR "Joe Burks, jburks@wavicle.org"
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#define DRIVER_DESC "ViCam WebCam Driver"
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/* Define these values to match your device */
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#define USB_VICAM_VENDOR_ID 0x04c1
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#define USB_VICAM_PRODUCT_ID 0x009d
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#define USB_COMPRO_VENDOR_ID 0x0602
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#define USB_COMPRO_PRODUCT_ID 0x1001
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#define VICAM_BYTES_PER_PIXEL 3
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#define VICAM_MAX_READ_SIZE (512*242+128)
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#define VICAM_MAX_FRAME_SIZE (VICAM_BYTES_PER_PIXEL*320*240)
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#define VICAM_FRAMES 2
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#define VICAM_HEADER_SIZE 64
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/* rvmalloc / rvfree copied from usbvideo.c
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*
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* Not sure why these are not yet non-statics which I can reference through
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* usbvideo.h the same as it is in 2.4.20. I bet this will get fixed sometime
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* in the future.
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*
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*/
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static void *rvmalloc(unsigned long size)
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{
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void *mem;
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unsigned long adr;
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size = PAGE_ALIGN(size);
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mem = vmalloc_32(size);
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if (!mem)
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return NULL;
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memset(mem, 0, size); /* Clear the ram out, no junk to the user */
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adr = (unsigned long) mem;
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while (size > 0) {
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SetPageReserved(vmalloc_to_page((void *)adr));
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adr += PAGE_SIZE;
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size -= PAGE_SIZE;
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}
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return mem;
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}
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static void rvfree(void *mem, unsigned long size)
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{
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unsigned long adr;
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if (!mem)
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return;
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adr = (unsigned long) mem;
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while ((long) size > 0) {
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ClearPageReserved(vmalloc_to_page((void *)adr));
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adr += PAGE_SIZE;
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size -= PAGE_SIZE;
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}
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vfree(mem);
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}
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struct vicam_camera {
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u16 shutter_speed; // capture shutter speed
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u16 gain; // capture gain
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u8 *raw_image; // raw data captured from the camera
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u8 *framebuf; // processed data in RGB24 format
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u8 *cntrlbuf; // area used to send control msgs
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struct video_device vdev; // v4l video device
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struct usb_device *udev; // usb device
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/* guard against simultaneous accesses to the camera */
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struct mutex cam_lock;
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int is_initialized;
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u8 open_count;
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u8 bulkEndpoint;
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int needsDummyRead;
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};
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static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
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static void vicam_disconnect(struct usb_interface *intf);
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static void read_frame(struct vicam_camera *cam, int framenum);
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static void vicam_decode_color(const u8 *, u8 *);
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static int __send_control_msg(struct vicam_camera *cam,
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u8 request,
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u16 value,
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u16 index,
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unsigned char *cp,
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u16 size)
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{
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int status;
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/* cp must be memory that has been allocated by kmalloc */
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status = usb_control_msg(cam->udev,
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usb_sndctrlpipe(cam->udev, 0),
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request,
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USB_DIR_OUT | USB_TYPE_VENDOR |
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USB_RECIP_DEVICE, value, index,
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cp, size, 1000);
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status = min(status, 0);
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if (status < 0) {
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printk(KERN_INFO "Failed sending control message, error %d.\n",
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status);
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}
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return status;
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}
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static int send_control_msg(struct vicam_camera *cam,
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u8 request,
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u16 value,
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u16 index,
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unsigned char *cp,
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u16 size)
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{
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int status = -ENODEV;
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mutex_lock(&cam->cam_lock);
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if (cam->udev) {
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status = __send_control_msg(cam, request, value,
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index, cp, size);
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}
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mutex_unlock(&cam->cam_lock);
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return status;
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}
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static int
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initialize_camera(struct vicam_camera *cam)
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{
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int err;
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const struct ihex_binrec *rec;
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const struct firmware *fw;
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err = request_ihex_firmware(&fw, "vicam/firmware.fw", &cam->udev->dev);
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if (err) {
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printk(KERN_ERR "Failed to load \"vicam/firmware.fw\": %d\n",
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err);
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return err;
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}
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for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
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memcpy(cam->cntrlbuf, rec->data, be16_to_cpu(rec->len));
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err = send_control_msg(cam, 0xff, 0, 0,
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cam->cntrlbuf, be16_to_cpu(rec->len));
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if (err)
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break;
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}
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release_firmware(fw);
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return err;
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}
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static int
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set_camera_power(struct vicam_camera *cam, int state)
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{
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int status;
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if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0)
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return status;
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if (state) {
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send_control_msg(cam, 0x55, 1, 0, NULL, 0);
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}
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return 0;
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}
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static int
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vicam_ioctl(struct inode *inode, struct file *file, unsigned int ioctlnr, unsigned long arg)
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{
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void __user *user_arg = (void __user *)arg;
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struct vicam_camera *cam = file->private_data;
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int retval = 0;
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if (!cam)
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return -ENODEV;
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switch (ioctlnr) {
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/* query capabilities */
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case VIDIOCGCAP:
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{
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struct video_capability b;
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DBG("VIDIOCGCAP\n");
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memset(&b, 0, sizeof(b));
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strcpy(b.name, "ViCam-based Camera");
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b.type = VID_TYPE_CAPTURE;
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b.channels = 1;
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b.audios = 0;
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b.maxwidth = 320; /* VIDEOSIZE_CIF */
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b.maxheight = 240;
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b.minwidth = 320; /* VIDEOSIZE_48_48 */
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b.minheight = 240;
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if (copy_to_user(user_arg, &b, sizeof(b)))
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retval = -EFAULT;
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break;
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}
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/* get/set video source - we are a camera and nothing else */
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case VIDIOCGCHAN:
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{
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struct video_channel v;
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DBG("VIDIOCGCHAN\n");
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if (copy_from_user(&v, user_arg, sizeof(v))) {
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retval = -EFAULT;
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break;
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}
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if (v.channel != 0) {
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retval = -EINVAL;
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break;
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}
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v.channel = 0;
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strcpy(v.name, "Camera");
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v.tuners = 0;
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v.flags = 0;
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v.type = VIDEO_TYPE_CAMERA;
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v.norm = 0;
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if (copy_to_user(user_arg, &v, sizeof(v)))
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retval = -EFAULT;
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break;
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}
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case VIDIOCSCHAN:
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{
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int v;
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if (copy_from_user(&v, user_arg, sizeof(v)))
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retval = -EFAULT;
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DBG("VIDIOCSCHAN %d\n", v);
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if (retval == 0 && v != 0)
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retval = -EINVAL;
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break;
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}
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/* image properties */
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case VIDIOCGPICT:
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{
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struct video_picture vp;
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DBG("VIDIOCGPICT\n");
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memset(&vp, 0, sizeof (struct video_picture));
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vp.brightness = cam->gain << 8;
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vp.depth = 24;
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vp.palette = VIDEO_PALETTE_RGB24;
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if (copy_to_user(user_arg, &vp, sizeof (struct video_picture)))
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retval = -EFAULT;
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break;
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}
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case VIDIOCSPICT:
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{
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struct video_picture vp;
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if (copy_from_user(&vp, user_arg, sizeof(vp))) {
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retval = -EFAULT;
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break;
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}
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DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth,
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vp.palette);
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cam->gain = vp.brightness >> 8;
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if (vp.depth != 24
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|| vp.palette != VIDEO_PALETTE_RGB24)
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retval = -EINVAL;
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break;
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}
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/* get/set capture window */
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case VIDIOCGWIN:
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{
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struct video_window vw;
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vw.x = 0;
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vw.y = 0;
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vw.width = 320;
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vw.height = 240;
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vw.chromakey = 0;
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vw.flags = 0;
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vw.clips = NULL;
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vw.clipcount = 0;
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DBG("VIDIOCGWIN\n");
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if (copy_to_user(user_arg, (void *)&vw, sizeof(vw)))
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retval = -EFAULT;
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// I'm not sure what the deal with a capture window is, it is very poorly described
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// in the doc. So I won't support it now.
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break;
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}
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case VIDIOCSWIN:
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{
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struct video_window vw;
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if (copy_from_user(&vw, user_arg, sizeof(vw))) {
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retval = -EFAULT;
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break;
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}
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DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height);
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if ( vw.width != 320 || vw.height != 240 )
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retval = -EFAULT;
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break;
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}
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/* mmap interface */
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case VIDIOCGMBUF:
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{
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struct video_mbuf vm;
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int i;
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DBG("VIDIOCGMBUF\n");
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memset(&vm, 0, sizeof (vm));
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vm.size =
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VICAM_MAX_FRAME_SIZE * VICAM_FRAMES;
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vm.frames = VICAM_FRAMES;
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for (i = 0; i < VICAM_FRAMES; i++)
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vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i;
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if (copy_to_user(user_arg, (void *)&vm, sizeof(vm)))
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retval = -EFAULT;
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break;
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}
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case VIDIOCMCAPTURE:
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{
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struct video_mmap vm;
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// int video_size;
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if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) {
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retval = -EFAULT;
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break;
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}
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DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format);
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if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 )
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retval = -EINVAL;
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// in theory right here we'd start the image capturing
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// (fill in a bulk urb and submit it asynchronously)
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//
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// Instead we're going to do a total hack job for now and
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// retrieve the frame in VIDIOCSYNC
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break;
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}
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case VIDIOCSYNC:
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{
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int frame;
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if (copy_from_user((void *)&frame, user_arg, sizeof(int))) {
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retval = -EFAULT;
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break;
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}
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DBG("VIDIOCSYNC: %d\n", frame);
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read_frame(cam, frame);
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vicam_decode_color(cam->raw_image,
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cam->framebuf +
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frame * VICAM_MAX_FRAME_SIZE );
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break;
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}
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/* pointless to implement overlay with this camera */
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case VIDIOCCAPTURE:
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case VIDIOCGFBUF:
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case VIDIOCSFBUF:
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case VIDIOCKEY:
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retval = -EINVAL;
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break;
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/* tuner interface - we have none */
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case VIDIOCGTUNER:
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case VIDIOCSTUNER:
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case VIDIOCGFREQ:
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case VIDIOCSFREQ:
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retval = -EINVAL;
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break;
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/* audio interface - we have none */
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case VIDIOCGAUDIO:
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case VIDIOCSAUDIO:
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retval = -EINVAL;
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break;
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default:
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retval = -ENOIOCTLCMD;
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break;
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}
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return retval;
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}
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static int
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vicam_open(struct inode *inode, struct file *file)
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{
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struct video_device *dev = video_devdata(file);
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struct vicam_camera *cam =
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(struct vicam_camera *) dev->priv;
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DBG("open\n");
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if (!cam) {
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printk(KERN_ERR
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"vicam video_device improperly initialized");
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return -EINVAL;
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}
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/* the videodev_lock held above us protects us from
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* simultaneous opens...for now. we probably shouldn't
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* rely on this fact forever.
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*/
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if (cam->open_count > 0) {
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printk(KERN_INFO
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"vicam_open called on already opened camera");
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return -EBUSY;
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}
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cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
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if (!cam->raw_image) {
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return -ENOMEM;
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}
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cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
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if (!cam->framebuf) {
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kfree(cam->raw_image);
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return -ENOMEM;
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}
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cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!cam->cntrlbuf) {
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kfree(cam->raw_image);
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rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
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return -ENOMEM;
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}
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// First upload firmware, then turn the camera on
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if (!cam->is_initialized) {
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initialize_camera(cam);
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cam->is_initialized = 1;
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}
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set_camera_power(cam, 1);
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cam->needsDummyRead = 1;
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cam->open_count++;
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file->private_data = cam;
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return 0;
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}
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static int
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vicam_close(struct inode *inode, struct file *file)
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{
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struct vicam_camera *cam = file->private_data;
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int open_count;
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struct usb_device *udev;
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DBG("close\n");
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/* it's not the end of the world if
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* we fail to turn the camera off.
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*/
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set_camera_power(cam, 0);
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kfree(cam->raw_image);
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rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
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kfree(cam->cntrlbuf);
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mutex_lock(&cam->cam_lock);
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cam->open_count--;
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open_count = cam->open_count;
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udev = cam->udev;
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mutex_unlock(&cam->cam_lock);
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if (!open_count && !udev) {
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kfree(cam);
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}
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|
|
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,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = v4l_compat_ioctl32,
|
|
#endif
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct video_device vicam_template = {
|
|
.name = "ViCam-based USB Camera",
|
|
.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");
|
|
MODULE_FIRMWARE("vicam/firmware.fw");
|