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/*
Winbond w9966cf Webcam parport driver.
Version 0.32
Copyright (C) 2001 Jakob Kemi <jakob.kemi@post.utfors.se>
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.
*/
/*
Supported devices:
*Lifeview FlyCam Supra (using the Philips saa7111a chip)
Does any other model using the w9966 interface chip exist ?
Todo:
*Add a working EPP mode, since DMA ECP read isn't implemented
in the parport drivers. (That's why it's so sloow)
*Add support for other ccd-control chips than the saa7111
please send me feedback on what kind of chips you have.
*Add proper probing. I don't know what's wrong with the IEEE1284
parport drivers but (IEEE1284_MODE_NIBBLE|IEEE1284_DEVICE_ID)
and nibble read seems to be broken for some peripherals.
*Add probing for onboard SRAM, port directions etc. (if possible)
*Add support for the hardware compressed modes (maybe using v4l2)
*Fix better support for the capture window (no skewed images, v4l
interface to capt. window)
*Probably some bugs that I don't know of
Please support me by sending feedback!
Changes:
Alan Cox: Removed RGB mode for kernel merge, added THIS_MODULE
and owner support for newer module locks
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <linux/parport.h>
/*#define DEBUG*/ /* Undef me for production */
#ifdef DEBUG
#define DPRINTF(x, a...) printk(KERN_DEBUG "W9966: %s(): "x, __func__ , ##a)
#else
#define DPRINTF(x...)
#endif
/*
* Defines, simple typedefs etc.
*/
#define W9966_DRIVERNAME "W9966CF Webcam"
#define W9966_MAXCAMS 4 // Maximum number of cameras
#define W9966_RBUFFER 2048 // Read buffer (must be an even number)
#define W9966_SRAMSIZE 131072 // 128kb
#define W9966_SRAMID 0x02 // check w9966cf.pdf
// Empirically determined window limits
#define W9966_WND_MIN_X 16
#define W9966_WND_MIN_Y 14
#define W9966_WND_MAX_X 705
#define W9966_WND_MAX_Y 253
#define W9966_WND_MAX_W (W9966_WND_MAX_X - W9966_WND_MIN_X)
#define W9966_WND_MAX_H (W9966_WND_MAX_Y - W9966_WND_MIN_Y)
// Keep track of our current state
#define W9966_STATE_PDEV 0x01
#define W9966_STATE_CLAIMED 0x02
#define W9966_STATE_VDEV 0x04
#define W9966_I2C_W_ID 0x48
#define W9966_I2C_R_ID 0x49
#define W9966_I2C_R_DATA 0x08
#define W9966_I2C_R_CLOCK 0x04
#define W9966_I2C_W_DATA 0x02
#define W9966_I2C_W_CLOCK 0x01
struct w9966_dev {
unsigned char dev_state;
unsigned char i2c_state;
unsigned short ppmode;
struct parport* pport;
struct pardevice* pdev;
struct video_device vdev;
unsigned short width;
unsigned short height;
unsigned char brightness;
signed char contrast;
signed char color;
signed char hue;
};
/*
* Module specific properties
*/
MODULE_AUTHOR("Jakob Kemi <jakob.kemi@post.utfors.se>");
MODULE_DESCRIPTION("Winbond w9966cf WebCam driver (0.32)");
MODULE_LICENSE("GPL");
#ifdef MODULE
static const char* pardev[] = {[0 ... W9966_MAXCAMS] = ""};
#else
static const char* pardev[] = {[0 ... W9966_MAXCAMS] = "aggressive"};
#endif
module_param_array(pardev, charp, NULL, 0);
MODULE_PARM_DESC(pardev, "pardev: where to search for\n\
\teach camera. 'aggressive' means brute-force search.\n\
\tEg: >pardev=parport3,aggressive,parport2,parport1< would assign\n\
\tcam 1 to parport3 and search every parport for cam 2 etc...");
static int parmode;
module_param(parmode, int, 0);
MODULE_PARM_DESC(parmode, "parmode: transfer mode (0=auto, 1=ecp, 2=epp");
static int video_nr = -1;
module_param(video_nr, int, 0);
/*
* Private data
*/
static struct w9966_dev w9966_cams[W9966_MAXCAMS];
/*
* Private function declares
*/
static inline void w9966_setState(struct w9966_dev* cam, int mask, int val);
static inline int w9966_getState(struct w9966_dev* cam, int mask, int val);
static inline void w9966_pdev_claim(struct w9966_dev *vdev);
static inline void w9966_pdev_release(struct w9966_dev *vdev);
static int w9966_rReg(struct w9966_dev* cam, int reg);
static int w9966_wReg(struct w9966_dev* cam, int reg, int data);
#if 0
static int w9966_rReg_i2c(struct w9966_dev* cam, int reg);
#endif
static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data);
static int w9966_findlen(int near, int size, int maxlen);
static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor);
static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h);
static int w9966_init(struct w9966_dev* cam, struct parport* port);
static void w9966_term(struct w9966_dev* cam);
static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state);
static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state);
static inline int w9966_i2c_getsda(struct w9966_dev* cam);
static inline int w9966_i2c_getscl(struct w9966_dev* cam);
static int w9966_i2c_wbyte(struct w9966_dev* cam, int data);
#if 0
static int w9966_i2c_rbyte(struct w9966_dev* cam);
#endif
static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned
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