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linux-sg2042/drivers/media/video/w9966.c

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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/videodev.h>
#include <media/v4l2-common.h>
#include <linux/parport.h>
//#define DEBUG // Undef me for production
#ifdef DEBUG
#define DPRINTF(x, a...) printk(KERN_DEBUG "W9966: %s(): "x, __FUNCTION__ , ##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 = 0;
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 long arg);
static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos);
static const struct file_operations w9966_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = w9966_v4l_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.read = w9966_v4l_read,
.llseek = no_llseek,
};
static struct video_device w9966_template = {
.owner = THIS_MODULE,
.name = W9966_DRIVERNAME,
.type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
.fops = &w9966_fops,
};
/*
* Private function defines
*/
// Set camera phase flags, so we know what to uninit when terminating
static inline void w9966_setState(struct w9966_dev* cam, int mask, int val)
{
cam->dev_state = (cam->dev_state & ~mask) ^ val;
}
// Get camera phase flags
static inline int w9966_getState(struct w9966_dev* cam, int mask, int val)
{
return ((cam->dev_state & mask) == val);
}
// Claim parport for ourself
static inline void w9966_pdev_claim(struct w9966_dev* cam)
{
if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED))
return;
parport_claim_or_block(cam->pdev);
w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED);
}
// Release parport for others to use
static inline void w9966_pdev_release(struct w9966_dev* cam)
{
if (w9966_getState(cam, W9966_STATE_CLAIMED, 0))
return;
parport_release(cam->pdev);
w9966_setState(cam, W9966_STATE_CLAIMED, 0);
}
// Read register from W9966 interface-chip
// Expects a claimed pdev
// -1 on error, else register data (byte)
static int w9966_rReg(struct w9966_dev* cam, int reg)
{
// ECP, read, regtransfer, REG, REG, REG, REG, REG
const unsigned char addr = 0x80 | (reg & 0x1f);
unsigned char val;
if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
return -1;
if (parport_write(cam->pport, &addr, 1) != 1)
return -1;
if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
return -1;
if (parport_read(cam->pport, &val, 1) != 1)
return -1;
return val;
}
// Write register to W9966 interface-chip
// Expects a claimed pdev
// -1 on error
static int w9966_wReg(struct w9966_dev* cam, int reg, int data)
{
// ECP, write, regtransfer, REG, REG, REG, REG, REG
const unsigned char addr = 0xc0 | (reg & 0x1f);
const unsigned char val = data;
if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
return -1;
if (parport_write(cam->pport, &addr, 1) != 1)
return -1;
if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
return -1;
if (parport_write(cam->pport, &val, 1) != 1)
return -1;
return 0;
}
// Initialize camera device. Setup all internal flags, set a
// default video mode, setup ccd-chip, register v4l device etc..
// Also used for 'probing' of hardware.
// -1 on error
static int w9966_init(struct w9966_dev* cam, struct parport* port)
{
if (cam->dev_state != 0)
return -1;
cam->pport = port;
cam->brightness = 128;
cam->contrast = 64;
cam->color = 64;
cam->hue = 0;
// Select requested transfer mode
switch(parmode)
{
default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
case 0:
if (port->modes & PARPORT_MODE_ECP)
cam->ppmode = IEEE1284_MODE_ECP;
else if (port->modes & PARPORT_MODE_EPP)
cam->ppmode = IEEE1284_MODE_EPP;
else
cam->ppmode = IEEE1284_MODE_ECP;
break;
case 1: // hw- or sw-ecp
cam->ppmode = IEEE1284_MODE_ECP;
break;
case 2: // hw- or sw-epp
cam->ppmode = IEEE1284_MODE_EPP;
break;
}
// Tell the parport driver that we exists
cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL);
if (cam->pdev == NULL) {
DPRINTF("parport_register_device() failed\n");
return -1;
}
w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV);
w9966_pdev_claim(cam);
// Setup a default capture mode
if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) {
DPRINTF("w9966_setup() failed.\n");
return -1;
}
w9966_pdev_release(cam);
// Fill in the video_device struct and register us to v4l
memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device));
cam->vdev.priv = cam;
if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) == -1)
return -1;
w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV);
// All ok
printk(
"w9966cf: Found and initialized a webcam on %s.\n",
cam->pport->name
);
return 0;
}
// Terminate everything gracefully
static void w9966_term(struct w9966_dev* cam)
{
// Unregister from v4l
if (w9966_getState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) {
video_unregister_device(&cam->vdev);
w9966_setState(cam, W9966_STATE_VDEV, 0);
}
// Terminate from IEEE1284 mode and release pdev block
if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
w9966_pdev_claim(cam);
parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
w9966_pdev_release(cam);
}
// Unregister from parport
if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
parport_unregister_device(cam->pdev);
w9966_setState(cam, W9966_STATE_PDEV, 0);
}
}
// Find a good length for capture window (used both for W and H)
// A bit ugly but pretty functional. The capture length
// have to match the downscale
static int w9966_findlen(int near, int size, int maxlen)
{
int bestlen = size;
int besterr = abs(near - bestlen);
int len;
for(len = size+1;len < maxlen;len++)
{
int err;
if ( ((64*size) %len) != 0)
continue;
err = abs(near - len);
// Only continue as long as we keep getting better values
if (err > besterr)
break;
besterr = err;
bestlen = len;
}
return bestlen;
}
// Modify capture window (if necessary)
// and calculate downscaling
// Return -1 on error
static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor)
{
int maxlen = max - min;
int len = *end - *beg + 1;
int newlen = w9966_findlen(len, size, maxlen);
int err = newlen - len;
// Check for bad format
if (newlen > maxlen || newlen < size)
return -1;
// Set factor (6 bit fixed)
*factor = (64*size) / newlen;
if (*factor == 64)
*factor = 0x00; // downscale is disabled
else
*factor |= 0x80; // set downscale-enable bit
// Modify old beginning and end
*beg -= err / 2;
*end += err - (err / 2);
// Move window if outside borders
if (*beg < min) {
*end += min - *beg;
*beg += min - *beg;
}
if (*end > max) {
*beg -= *end - max;
*end -= *end - max;
}
return 0;
}
// Setup the cameras capture window etc.
// Expects a claimed pdev
// return -1 on error
static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
{
unsigned int i;
unsigned int enh_s, enh_e;
unsigned char scale_x, scale_y;
unsigned char regs[0x1c];
unsigned char saa7111_regs[] = {
0x21, 0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00,
0x88, 0x10, 0x80, 0x40, 0x40, 0x00, 0x01, 0x00,
0x48, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x71, 0xe7, 0x00, 0x00, 0xc0
};
if (w*h*2 > W9966_SRAMSIZE)
{
DPRINTF("capture window exceeds SRAM size!.\n");
w = 200; h = 160; // Pick default values
}
w &= ~0x1;
if (w < 2) w = 2;
if (h < 1) h = 1;
if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W;
if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H;
cam->width = w;
cam->height = h;
enh_s = 0;
enh_e = w*h*2;
// Modify capture window if necessary and calculate downscaling
if (
w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 ||
w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0
) return -1;
DPRINTF(
"%dx%d, x: %d<->%d, y: %d<->%d, sx: %d/64, sy: %d/64.\n",
w, h, x1, x2, y1, y2, scale_x&~0x80, scale_y&~0x80
);
// Setup registers
regs[0x00] = 0x00; // Set normal operation
regs[0x01] = 0x18; // Capture mode
regs[0x02] = scale_y; // V-scaling
regs[0x03] = scale_x; // H-scaling
// Capture window
regs[0x04] = (x1 & 0x0ff); // X-start (8 low bits)
regs[0x05] = (x1 & 0x300)>>8; // X-start (2 high bits)
regs[0x06] = (y1 & 0x0ff); // Y-start (8 low bits)
regs[0x07] = (y1 & 0x300)>>8; // Y-start (2 high bits)
regs[0x08] = (x2 & 0x0ff); // X-end (8 low bits)
regs[0x09] = (x2 & 0x300)>>8; // X-end (2 high bits)
regs[0x0a] = (y2 & 0x0ff); // Y-end (8 low bits)
regs[0x0c] = W9966_SRAMID; // SRAM-banks (1x 128kb)
// Enhancement layer
regs[0x0d] = (enh_s& 0x000ff); // Enh. start (0-7)
regs[0x0e] = (enh_s& 0x0ff00)>>8; // Enh. start (8-15)
regs[0x0f] = (enh_s& 0x70000)>>16; // Enh. start (16-17/18??)
regs[0x10] = (enh_e& 0x000ff); // Enh. end (0-7)
regs[0x11] = (enh_e& 0x0ff00)>>8; // Enh. end (8-15)
regs[0x12] = (enh_e& 0x70000)>>16; // Enh. end (16-17/18??)
// Misc
regs[0x13] = 0x40; // VEE control (raw 4:2:2)
regs[0x17] = 0x00; // ???
regs[0x18] = cam->i2c_state = 0x00; // Serial bus
regs[0x19] = 0xff; // I/O port direction control
regs[0x1a] = 0xff; // I/O port data register
regs[0x1b] = 0x10; // ???
// SAA7111 chip settings
saa7111_regs[0x0a] = cam->brightness;
saa7111_regs[0x0b] = cam->contrast;
saa7111_regs[0x0c] = cam->color;
saa7111_regs[0x0d] = cam->hue;
// Reset (ECP-fifo & serial-bus)
if (w9966_wReg(cam, 0x00, 0x03) == -1)
return -1;
// Write regs to w9966cf chip
for (i = 0; i < 0x1c; i++)
if (w9966_wReg(cam, i, regs[i]) == -1)
return -1;
// Write regs to saa7111 chip
for (i = 0; i < 0x20; i++)
if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1)
return -1;
return 0;
}
/*
* Ugly and primitive i2c protocol functions
*/
// Sets the data line on the i2c bus.
// Expects a claimed pdev.
static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state)
{
if (state)
cam->i2c_state |= W9966_I2C_W_DATA;
else
cam->i2c_state &= ~W9966_I2C_W_DATA;
w9966_wReg(cam, 0x18, cam->i2c_state);
udelay(5);
}
// Get peripheral clock line
// Expects a claimed pdev.
static inline int w9966_i2c_getscl(struct w9966_dev* cam)
{
const unsigned char state = w9966_rReg(cam, 0x18);
return ((state & W9966_I2C_R_CLOCK) > 0);
}
// Sets the clock line on the i2c bus.
// Expects a claimed pdev. -1 on error
static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
{
unsigned long timeout;
if (state)
cam->i2c_state |= W9966_I2C_W_CLOCK;
else
cam->i2c_state &= ~W9966_I2C_W_CLOCK;
w9966_wReg(cam, 0x18, cam->i2c_state);
udelay(5);
// we go to high, we also expect the peripheral to ack.
if (state) {
timeout = jiffies + 100;
while (!w9966_i2c_getscl(cam)) {
if (time_after(jiffies, timeout))
return -1;
}
}
return 0;
}
// Get peripheral data line
// Expects a claimed pdev.
static inline int w9966_i2c_getsda(struct w9966_dev* cam)
{
const unsigned char state = w9966_rReg(cam, 0x18);
return ((state & W9966_I2C_R_DATA) > 0);
}
// Write a byte with ack to the i2c bus.
// Expects a claimed pdev. -1 on error
static int w9966_i2c_wbyte(struct w9966_dev* cam, int data)
{
int i;
for (i = 7; i >= 0; i--)
{
w9966_i2c_setsda(cam, (data >> i) & 0x01);
if (w9966_i2c_setscl(cam, 1) == -1)
return -1;
w9966_i2c_setscl(cam, 0);
}
w9966_i2c_setsda(cam, 1);
if (w9966_i2c_setscl(cam, 1) == -1)
return -1;
w9966_i2c_setscl(cam, 0);
return 0;
}
// Read a data byte with ack from the i2c-bus
// Expects a claimed pdev. -1 on error
#if 0
static int w9966_i2c_rbyte(struct w9966_dev* cam)
{
unsigned char data = 0x00;
int i;
w9966_i2c_setsda(cam, 1);
for (i = 0; i < 8; i++)
{
if (w9966_i2c_setscl(cam, 1) == -1)
return -1;
data = data << 1;
if (w9966_i2c_getsda(cam))
data |= 0x01;
w9966_i2c_setscl(cam, 0);
}
return data;
}
#endif
// Read a register from the i2c device.
// Expects claimed pdev. -1 on error
#if 0
static int w9966_rReg_i2c(struct w9966_dev* cam, int reg)
{
int data;
w9966_i2c_setsda(cam, 0);
w9966_i2c_setscl(cam, 0);
if (
w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
w9966_i2c_wbyte(cam, reg) == -1
)
return -1;
w9966_i2c_setsda(cam, 1);
if (w9966_i2c_setscl(cam, 1) == -1)
return -1;
w9966_i2c_setsda(cam, 0);
w9966_i2c_setscl(cam, 0);
if (
w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 ||
(data = w9966_i2c_rbyte(cam)) == -1
)
return -1;
w9966_i2c_setsda(cam, 0);
if (w9966_i2c_setscl(cam, 1) == -1)
return -1;
w9966_i2c_setsda(cam, 1);
return data;
}
#endif
// Write a register to the i2c device.
// Expects claimed pdev. -1 on error
static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data)
{
w9966_i2c_setsda(cam, 0);
w9966_i2c_setscl(cam, 0);
if (
w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
w9966_i2c_wbyte(cam, reg) == -1 ||
w9966_i2c_wbyte(cam, data) == -1
)
return -1;
w9966_i2c_setsda(cam, 0);
if (w9966_i2c_setscl(cam, 1) == -1)
return -1;
w9966_i2c_setsda(cam, 1);
return 0;
}
/*
* Video4linux interfacing
*/
static int w9966_v4l_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *vdev = video_devdata(file);
struct w9966_dev *cam = vdev->priv;
switch(cmd)
{
case VIDIOCGCAP:
{
static struct video_capability vcap = {
.name = W9966_DRIVERNAME,
.type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
.channels = 1,
.maxwidth = W9966_WND_MAX_W,
.maxheight = W9966_WND_MAX_H,
.minwidth = 2,
.minheight = 1,
};
struct video_capability *cap = arg;
*cap = vcap;
return 0;
}
case VIDIOCGCHAN:
{
struct video_channel *vch = arg;
if(vch->channel != 0) // We only support one channel (#0)
return -EINVAL;
memset(vch,0,sizeof(*vch));
strcpy(vch->name, "CCD-input");
vch->type = VIDEO_TYPE_CAMERA;
return 0;
}
case VIDIOCSCHAN:
{
struct video_channel *vch = arg;
if(vch->channel != 0)
return -EINVAL;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *vtune = arg;
if(vtune->tuner != 0)
return -EINVAL;
strcpy(vtune->name, "no tuner");
vtune->rangelow = 0;
vtune->rangehigh = 0;
vtune->flags = VIDEO_TUNER_NORM;
vtune->mode = VIDEO_MODE_AUTO;
vtune->signal = 0xffff;
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner *vtune = arg;
if (vtune->tuner != 0)
return -EINVAL;
if (vtune->mode != VIDEO_MODE_AUTO)
return -EINVAL;
return 0;
}
case VIDIOCGPICT:
{
struct video_picture vpic = {
cam->brightness << 8, // brightness
(cam->hue + 128) << 8, // hue
cam->color << 9, // color
cam->contrast << 9, // contrast
0x8000, // whiteness
16, VIDEO_PALETTE_YUV422// bpp, palette format
};
struct video_picture *pic = arg;
*pic = vpic;
return 0;
}
case VIDIOCSPICT:
{
struct video_picture *vpic = arg;
if (vpic->depth != 16 || (vpic->palette != VIDEO_PALETTE_YUV422 && vpic->palette != VIDEO_PALETTE_YUYV))
return -EINVAL;
cam->brightness = vpic->brightness >> 8;
cam->hue = (vpic->hue >> 8) - 128;
cam->color = vpic->colour >> 9;
cam->contrast = vpic->contrast >> 9;
w9966_pdev_claim(cam);
if (
w9966_wReg_i2c(cam, 0x0a, cam->brightness) == -1 ||
w9966_wReg_i2c(cam, 0x0b, cam->contrast) == -1 ||
w9966_wReg_i2c(cam, 0x0c, cam->color) == -1 ||
w9966_wReg_i2c(cam, 0x0d, cam->hue) == -1
) {
w9966_pdev_release(cam);
return -EIO;
}
w9966_pdev_release(cam);
return 0;
}
case VIDIOCSWIN:
{
int ret;
struct video_window *vwin = arg;
if (vwin->flags != 0)
return -EINVAL;
if (vwin->clipcount != 0)
return -EINVAL;
if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W)
return -EINVAL;
if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H)
return -EINVAL;
// Update camera regs
w9966_pdev_claim(cam);
ret = w9966_setup(cam, 0, 0, 1023, 1023, vwin->width, vwin->height);
w9966_pdev_release(cam);
if (ret != 0) {
DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n");
return -EIO;
}
return 0;
}
case VIDIOCGWIN:
{
struct video_window *vwin = arg;
memset(vwin, 0, sizeof(*vwin));
vwin->width = cam->width;
vwin->height = cam->height;
return 0;
}
// Unimplemented
case VIDIOCCAPTURE:
case VIDIOCGFBUF:
case VIDIOCSFBUF:
case VIDIOCKEY:
case VIDIOCGFREQ:
case VIDIOCSFREQ:
case VIDIOCGAUDIO:
case VIDIOCSAUDIO:
return -EINVAL;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, w9966_v4l_do_ioctl);
}
// Capture data
static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct video_device *vdev = video_devdata(file);
struct w9966_dev *cam = vdev->priv;
unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000
unsigned char __user *dest = (unsigned char __user *)buf;
unsigned long dleft = count;
unsigned char *tbuf;
// Why would anyone want more than this??
if (count > cam->width * cam->height * 2)
return -EINVAL;
w9966_pdev_claim(cam);
w9966_wReg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
w9966_wReg(cam, 0x00, 0x00); // Return to normal operation
w9966_wReg(cam, 0x01, 0x98); // Enable capture
// write special capture-addr and negotiate into data transfer
if (
(parport_negotiate(cam->pport, cam->ppmode|IEEE1284_ADDR) != 0 )||
(parport_write(cam->pport, &addr, 1) != 1 )||
(parport_negotiate(cam->pport, cam->ppmode|IEEE1284_DATA) != 0 )
) {
w9966_pdev_release(cam);
return -EFAULT;
}
tbuf = kmalloc(W9966_RBUFFER, GFP_KERNEL);
if (tbuf == NULL) {
count = -ENOMEM;
goto out;
}
while(dleft > 0)
{
unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
if (parport_read(cam->pport, tbuf, tsize) < tsize) {
count = -EFAULT;
goto out;
}
if (copy_to_user(dest, tbuf, tsize) != 0) {
count = -EFAULT;
goto out;
}
dest += tsize;
dleft -= tsize;
}
w9966_wReg(cam, 0x01, 0x18); // Disable capture
out:
kfree(tbuf);
w9966_pdev_release(cam);
return count;
}
// Called once for every parport on init
static void w9966_attach(struct parport *port)
{
int i;
for (i = 0; i < W9966_MAXCAMS; i++)
{
if (w9966_cams[i].dev_state != 0) // Cam is already assigned
continue;
if (
strcmp(pardev[i], "aggressive") == 0 ||
strcmp(pardev[i], port->name) == 0
) {
if (w9966_init(&w9966_cams[i], port) != 0)
w9966_term(&w9966_cams[i]);
break; // return
}
}
}
// Called once for every parport on termination
static void w9966_detach(struct parport *port)
{
int i;
for (i = 0; i < W9966_MAXCAMS; i++)
if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port)
w9966_term(&w9966_cams[i]);
}
static struct parport_driver w9966_ppd = {
.name = W9966_DRIVERNAME,
.attach = w9966_attach,
.detach = w9966_detach,
};
// Module entry point
static int __init w9966_mod_init(void)
{
int i;
for (i = 0; i < W9966_MAXCAMS; i++)
w9966_cams[i].dev_state = 0;
return parport_register_driver(&w9966_ppd);
}
// Module cleanup
static void __exit w9966_mod_term(void)
{
parport_unregister_driver(&w9966_ppd);
}
module_init(w9966_mod_init);
module_exit(w9966_mod_term);
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