/*
Winbond w9966cf Webcam parport driver.
Copyright (C) 2001 Jakob Kemi <jakob.kemi@telia.com>
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 (Philips saa7111a chip)
* Mikrotek Eyestar2 (Sanyo lc99053 chip)
Very rudimentary support, total lack of ccd-control chip settings.
Only green video data and no image properties (brightness, etc..)
If anyone can parse the Japanese data-sheet for the Sanyo lc99053
chip, feel free to help.
<http://service.semic.sanyo.co.jp/semi/ds_pdf_j/LC99053.pdf>
Thanks to Steven Griffiths <steve@sgriff.com> and
James Murray <jsm@jsm-net.demon.co.uk> for testing.
Todo:
* Add a working EPP mode (Is this a parport or a w9966 issue?)
* Add proper probing. IEEE1284 probing of w9966 chips haven't
worked since parport drivers changed in 2.4.x.
* Probe for onboard SRAM, port directions etc. (possible?)
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 <linux/parport.h>
#include <linux/types.h>
#include <linux/slab.h>
//#define DEBUG // Define for debug output.
#ifdef DEBUG
# define DPRINTF(f, a...) \
do { \
printk ("%s%s, %d (DEBUG) %s(): ", \
KERN_DEBUG, __FILE__, __LINE__, __func__); \
printk (f, ##a); \
} while (0)
# define DASSERT(x) \
do { \
if (!x) \
DPRINTF("Assertion failed at line %d.\n", __LINE__); \
} while (0)
#else
# define DPRINTF(f, a...) do {} while(0)
# define DASSERT(f, a...) do {} while(0)
#endif
/*
* Defines, simple typedefs etc.
*/
#define W9966_DRIVERNAME "w9966cf"
#define W9966_MAXCAMS 4 // Maximum number of cameras
#define W9966_RBUFFER 8096 // Read buffer (must be an even number)
#define W9966_WND_MIN_W 2
#define W9966_WND_MIN_H 1
// Keep track of our current state
#define W9966_STATE_PDEV 0x01 // pdev registered
#define W9966_STATE_CLAIMED 0x02 // pdev claimed
#define W9966_STATE_VDEV 0x04 // vdev registered
#define W9966_STATE_BUFFER 0x08 // buffer allocated
#define W9966_STATE_DETECTED 0x10 // model identified
#define W9966_SAA7111_ID 0x24 // I2C device id
#define W9966_I2C_UDELAY 5
#define W9966_I2C_TIMEOUT 100
#define W9966_I2C_R_DATA 0x08
#define W9966_I2C_R_CLOCK 0x04
#define W9966_I2C_W_DATA 0x02
#define W9966_I2C_W_CLOCK 0x01
#define MAX(a, b) ((a > b) ? a : b)
#define MIN(a, b) ((a > b) ? b : a)
struct w9966_dev {
struct video_device vdev;
struct parport* pport;
struct pardevice* pdev;
int ppmode;
u8* buffer;
u8 dev_state;
u8 i2c_state;
u16 width;
u16 height;
// Image properties
u8 brightness;
s8 contrast;
s8 color;
s8 hue;
// Model specific:
const char* name;
u32 sramsize;
u8 sramid; // reg 0x0c, bank layout
u8 cmask; // reg 0x01, for polarity
u16 min_x, max_x; // Capture window limits
u16 min_y, max_y;
int (*image)(struct w9966_dev* cam);
};
/*
* Module properties
*/
MODULE_AUTHOR("Jakob Kemi <jakob.kemi@telia.com>");
MODULE_DESCRIPTION("Winbond w9966cf webcam driver (Flycam Supra and others)");
MODULE_LICENSE("GPL");
static const char* pardev[] = {[0 ... W9966_MAXCAMS-1] = "auto"};
MODULE_PARM(pardev, "0-" __MODULE_STRING(W9966_MAXCAMS) "s");
MODULE_PARM_DESC(pardev,"\n\
<auto|name|none[,...]> Where to find cameras.\n\
auto = probe all parports for camera (default)\n\
name = name of parport (eg parport0)\n\
none = don't use this camera\n\
You can specify all cameras this way, for example:\n\
pardev=parport2,auto,none,parport0 would search for cam1 on parport2, search\n\
for cam2 on all parports, skip cam3 and search for cam4 on parport0");
static int parmode = 1;
MODULE_PARM(parmode, "i");
MODULE_PARM_DESC(parmode, "\n<0|1|2|3> transfer mode (0=auto, 1=ecp(default), 2=epp, 3=forced hw-ecp)");
static int video_nr[] = {[0 ... W9966_MAXCAMS-1] = -1};
MODULE_PARM(video_nr, "0-" __MODULE_STRING(W9966_MAXCAMS) "i");
MODULE_PARM_DESC(video_nr,"\n\
<-1|n[,...]> Specify V4L minor mode number.\n\
-1 = use next available (default)\n\
n = use minor number n (integer >= 0)\n\
You can specify all cameras this way, for example:\n\
video_nr=-1,2,-1 would assign minor number 2 for cam2 and use auto for cam1,\n\
cam3 and cam4");
/*
* Private data
*/
static struct w9966_dev* w9966_cams;
/*
* Private function declarations
*/
static inline void w9966_flag_set(struct w9966_dev* cam, int flag) {
cam->dev_state |= flag;}
static inline void w9966_flag_clear(struct w9966_dev* cam, int flag) {
cam->dev_state &= ~flag;}
static inline int w9966_flag_test(struct w9966_dev* cam, int flag) {
return (cam->dev_state & flag);}
static inline int 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);
static int w9966_init(struct w9966_dev* cam, struct parport* port, int vidnr);
static void w9966_term(struct w9966_dev* cam);
static int w9966_setup(struct w9966_dev* cam);
static int w9966_findlen(int near, int size, int maxlen);
static int w9966_calcscale(int size, int min, int max,
int* beg, int* end, u8* factor);
static int w9966_window(struct w9966_dev* cam, int x1, int y1,
int x2, int y2, int w, int h);
static int w9966_saa7111_init(struct w9966_dev* cam);
static int w9966_saa7111_image(struct w9966_dev* cam);
static int w9966_lc99053_init(struct w9966_dev* cam);
static int w9966_lc99053_image(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);
static int w9966_i2c_rbyte(struct w9966_dev* cam);
static int w9966_i2c_rreg(struct w9966_dev* cam, int device, int reg);
static int w9966_i2c_wreg(struct w9966_dev* cam, int device, int reg, int data);
static int w9966_v4l_open(struct video_device *vdev, int mode);
static void w9966_v4l_close(struct video_device *vdev);
static int w9966_v4l_ioctl(struct video_device *vdev,
unsigned int cmd, void *arg);
static long w9966_v4l_read(struct video_device *vdev,
char *buf, unsigned long count, int noblock);
/*
* Private function definitions
*/
// Claim parport for ourself
// 1 on success, else 0
static inline int w9966_pdev_claim(struct w9966_dev* cam)
{
if (w9966_flag_test(cam, W9966_STATE_CLAIMED))
return 1;
if (parport_claim_or_block(cam->pdev) < 0)
return 0;
w9966_flag_set(cam, W9966_STATE_CLAIMED);
return 1;
}
// Release parport for others to use
static inline void w9966_pdev_release(struct w9966_dev* cam)
{
if (!w9966_flag_test(cam, W9966_STATE_CLAIMED))
return;
parport_release(cam->pdev);
w9966_flag_clear(cam, W9966_STATE_CLAIMED);
}
// 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 u8 addr = 0x80 | (reg & 0x1f);
u8 val;
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 ||
parport_read(cam->pport, &val, 1) != 1)
return -1;
return val;
}
// Write register to w9966 interface-chip
// Expects a claimed pdev
// 1 on success, else 0
static int w9966_wreg(struct w9966_dev* cam, int reg, int data)
{
// ECP, write, regtransfer, REG, REG, REG, REG, REG
const u8 addr = 0xc0 | (reg & 0x1f);
const u8 val = data;
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 ||
parport_write(cam->pport, &val, 1) != 1)
return 0;
return 1;
}
// 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 success, else 0
static int w9966_init(struct w9966_dev* cam, struct parport* port, int vidnr)
{
if (cam->dev_state != 0)
return 0;
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_ECPSWE;
break;
case 1: // hw- or sw-ecp
if (port->modes & PARPORT_MODE_ECP)
cam->ppmode = IEEE1284_MODE_ECP;
else
cam->ppmode = IEEE1284_MODE_ECPSWE;
break;
case 2: // hw- or sw-epp
if (port->modes & PARPORT_MODE_EPP)
cam->ppmode = IEEE1284_MODE_EPP;
else
cam->ppmode = IEEE1284_MODE_EPPSWE;
break;
case 3: // hw-ecp
cam->ppmode = IEEE1284_MODE_ECP;
break;
}
// Tell the parport driver that we exists
cam->pdev = parport_register_device(
port, W9966_DRIVERNAME, NULL, NULL, NULL, 0, NULL);
if (cam->pdev == NULL) {
DPRINTF("parport_register_device() failed.\n");
return 0;
}
w9966_flag_set(cam, W9966_STATE_PDEV);
// Claim parport
if (!w9966_pdev_claim(cam)) {
DPRINTF("w9966_pdev_claim() failed.\n");
return 0;
}
// Perform initial w9966 setup
if (!w9966_setup(cam)) {
DPRINTF("w9966_setup() failed.\n");
return 0;
}
// Detect model
if (!w9966_saa7111_init(cam)) {
DPRINTF("w9966_saa7111_init() failed.\n");
return 0;
}
if (!w9966_lc99053_init(cam)) {
DPRINTF("w9966_lc99053_init() failed.\n");
return 0;
}
if (!w9966_flag_test(cam, W9966_STATE_DETECTED)) {
DPRINTF("Camera model not identified.\n");
return 0;
}
// Setup w9966 with a default capture mode (QCIF res.)
if (!w9966_window(cam, 0, 0, 1023, 1023, 176, 144)) {
DPRINTF("w9966_window() failed.\n");
return 0;
}
w9966_pdev_release(cam);
// Fill in the video_device struct and register us to v4l
memset(&cam->vdev, 0, sizeof(struct video_device));
strcpy(cam->vdev.name, W9966_DRIVERNAME);
cam->vdev.type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
cam->vdev.hardware = VID_HARDWARE_W9966;
cam->vdev.open = &w9966_v4l_open;
cam->vdev.close = &w9966_v4l_close;
cam->vdev.read = &w9966_v4l_read;
cam->vdev.ioctl = &w9966_v4l_ioctl;
cam->vdev.priv = (void*)cam;
cam->vdev.owner = THIS_MODULE;
if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, vidnr) == -1) {
DPRINTF("video_register_device() failed (minor: %d).\n", vidnr);
return 0;
}
w9966_flag_set(cam, W9966_STATE_VDEV);
// All ok
printk("w9966: Found and initialized %s on %s.\n",
cam->name, cam->pport->name);
return 1;
}
// Terminate everything gracefully
static void w9966_term(struct w9966_dev* cam)
{
// Delete allocated buffer
if (w9966_flag_test(cam, W9966_STATE_BUFFER))
kfree(cam->buffer);
// Unregister from v4l
if (w9966_flag_test(cam, W9966_STATE_VDEV))
video_unregister_device(&cam->vdev);
// Terminate from IEEE1284 mode and unregister from parport
if (w9966_flag_test(cam, W9966_STATE_PDEV)) {
if (w9966_pdev_claim(cam))
parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
w9966_pdev_release(cam);
parport_unregister_device(cam->pdev);
}
cam->dev_state = 0x00;
}
// Do initial setup for the w9966 chip, init i2c bus, etc.
// this is generic for all models
// expects a claimed pdev
// 1 on success, else 0
static int w9966_setup(struct w9966_dev* cam)
{
const u8 i2c = cam->i2c_state = W9966_I2C_W_DATA | W9966_I2C_W_CLOCK;
const u8 regs[] = {
0x40, // 0x13 - VEE control (raw 4:2:2)
0x00, 0x00, 0x00, // 0x14 - 0x16
0x00, // 0x17 - ???
i2c, // 0x18 - Serial bus
0xff, // 0x19 - I/O port direction control
0xff, // 0x1a - I/O port data register
0x10 // 0x1b - ???
};
int i;
DASSERT(w9966_flag_test(cam, W9966_STATE_CLAIMED));
// Reset (ECP-fifo & serial-bus)
if (!w9966_wreg(cam, 0x00, 0x03) ||
!w9966_wreg(cam, 0x00, 0x00))
return 0;
// Write regs to w9966cf chip
for (i = 0x13; i < 0x1c; i++)
if (!w9966_wreg(cam, i, regs[i-0x13]))
return 0;
return 1;
}
// 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
// 1 on success, else 0
static int w9966_calcscale(int size, int min, int max, int* beg, int* end, u8* factor)
{
const int maxlen = max - min;
const int len = *end - *beg + 1;
const int newlen = w9966_findlen(len, size, maxlen);
const int err = newlen - len;
// Check for bad format
if (newlen > maxlen || newlen < size)
return 0;
// 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 1;
}
// Setup the w9966 capture window and also set SRAM settings
// expects a claimed pdev and detected camera model
// 1 on success, else 0
static int w9966_window(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
{
unsigned int enh_s, enh_e;
u8 scale_x, scale_y;
u8 regs[0x13];
int i;
// Modify width and height to match capture window and SRAM
w = MAX(W9966_WND_MIN_W, w);
h = MAX(W9966_WND_MIN_H, h);
w = MIN(cam->max_x - cam->min_x, w);
h = MIN(cam->max_y - cam->min_y, h);
w &= ~0x1;
if (w*h*2 > cam->sramsize)
h = cam->sramsize / (w*2);
cam->width = w;
cam->height = h;
enh_s = 0;
enh_e = w*h*2;
// Calculate downscaling
if (!w9966_calcscale(w, cam->min_x, cam->max_x, &x1, &x2, &scale_x) ||
!w9966_calcscale(h, cam->min_y, cam->max_y, &y1, &y2, &scale_y))
return 0;
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] = cam->cmask; // 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] = cam->sramid; // SRAM layout
// 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??)
// Write regs to w9966cf chip
for (i = 0x01; i < 0x13; i++)
if (!w9966_wreg(cam, i, regs[i]))
return 0;
return 1;
}
// Detect and initialize saa7111 ccd-controller chip.
// expects a claimed parport
// expected to always return 1 unless error is _fatal_
// 1 on success, else 0
static int w9966_saa7111_init(struct w9966_dev* cam)
{
// saa7111 regs 0x00 trough 0x12
const u8 regs[] = {
0x00, // not written
0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00, 0x88, 0x10,
cam->brightness, // 0x0a
cam->contrast, // 0x0b
cam->color, // 0x0c
cam->hue, // 0x0d
0x01, 0x00, 0x48, 0x0c, 0x00,
};
int i;
if (w9966_flag_test(cam, W9966_STATE_DETECTED))
return 1;
// Write regs to saa7111 chip
for (i = 1; i < 0x13; i++)
if (!w9966_i2c_wreg(cam, W9966_SAA7111_ID, i, regs[i]))
return 1;
// Read back regs
for (i = 1; i < 0x13; i++)
if (w9966_i2c_rreg(cam, W9966_SAA7111_ID, i) != regs[i])
return 1;
// Fill in model specific data
cam->name = "Lifeview Flycam Supra";
cam->sramsize = 128 << 10; // 128 kib
cam->sramid = 0x02; // see w9966.pdf
cam->cmask = 0x18; // normal polarity
cam->min_x = 16; // empirically determined
cam->max_x = 705;
cam->min_y = 14;
cam->max_y = 253;
cam->image = &w9966_saa7111_image;
DPRINTF("Found and initialized a saa7111 chip.\n");
w9966_flag_set(cam, W9966_STATE_DETECTED);
return 1;
}
// Setup image properties (brightness, hue, etc.) for the saa7111 chip
// expects a claimed parport
// 1 on success, else 0
static int w9966_saa7111_image(struct w9966_dev* cam)
{
if (!w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0a, cam->brightness) ||
!w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0b, cam->contrast) ||
!w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0c, cam->color) ||
!w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0d, cam->hue))
return 0;
return 1;
}
// Detect and initialize lc99053 ccd-controller chip.
// expects a claimed parport
// this is currently a hack, no detection is done, we just assume an Eyestar2
// 1 on success, else 0
static int w9966_lc99053_init(struct w9966_dev* cam)
{
if (w9966_flag_test(cam, W9966_STATE_DETECTED))
return 1;
// Fill in model specific data
cam->name = "Microtek Eyestar2";
cam->sramsize = 128 << 10; // 128 kib
cam->sramid = 0x02; // w9966cf.pdf
cam->cmask = 0x10; // reverse polarity
cam->min_x = 16; // empirically determined
cam->max_x = 705;
cam->min_y = 14;
cam->max_y = 253;
cam->image = &w9966_lc99053_image;
DPRINTF("Found and initialized a lc99053 chip.\n");
w9966_flag_set(cam, W9966_STATE_DETECTED);
return 1;
}
// Setup image properties (brightness, hue, etc.) for the lc99053 chip
// expects a claimed parport
// 1 on success, else 0
static int w9966_lc99053_image(struct w9966_dev* cam)
{
return 1;
}
/*
* 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(W9966_I2C_UDELAY);
}
// Sets the clock line on the i2c bus.
// Expects a claimed pdev.
// 1 on success, else 0
static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
{
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(W9966_I2C_UDELAY);
// when we go to high, we also expect the peripheral to ack.
if (state) {
const int timeout = jiffies + W9966_I2C_TIMEOUT;
while (!w9966_i2c_getscl(cam)) {
if (time_after(jiffies, timeout))
return 0;
}
}
return 1;
}
// Get peripheral data line
// Expects a claimed pdev.
static inline int w9966_i2c_getsda(struct w9966_dev* cam)
{
const u8 pins = w9966_rreg(cam, 0x18);
return ((pins & W9966_I2C_R_DATA) > 0);
}
// Get peripheral clock line
// Expects a claimed pdev.
static inline int w9966_i2c_getscl(struct w9966_dev* cam)
{
const u8 pins = w9966_rreg(cam, 0x18);
return ((pins & W9966_I2C_R_CLOCK) > 0);
}
// Write a byte with ack to the i2c bus.
// Expects a claimed pdev.
// 1 on success, else 0
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) ||
!w9966_i2c_setscl(cam, 0))
return 0;
}
w9966_i2c_setsda(cam, 1);
if (!w9966_i2c_setscl(cam, 1) ||
!w9966_i2c_setscl(cam, 0))
return 0;
return 1;
}
// Read a data byte with ack from the i2c-bus
// Expects a claimed pdev. -1 on error
static int w9966_i2c_rbyte(struct w9966_dev* cam)
{
u8 data = 0x00;
int i;
w9966_i2c_setsda(cam, 1);
for (i = 0; i < 8; i++)
{
if (!w9966_i2c_setscl(cam, 1))
return -1;
data = data << 1;
if (w9966_i2c_getsda(cam))
data |= 0x01;
w9966_i2c_setscl(cam, 0);
}
return data;
}
// Read a register from the i2c device.
// Expects claimed pdev. -1 on error
static int w9966_i2c_rreg(struct w9966_dev* cam, int device, int reg)
{
int data;
w9966_i2c_setsda(cam, 0);
w9966_i2c_setscl(cam, 0);
if (!w9966_i2c_wbyte(cam, device << 1) ||
!w9966_i2c_wbyte(cam, reg))
return -1;
w9966_i2c_setsda(cam, 1);
if (!w9966_i2c_setscl(cam, 1))
return -1;
w9966_i2c_setsda(cam, 0);
w9966_i2c_setscl(cam, 0);
if (!w9966_i2c_wbyte(cam, (device << 1) | 1) ||
(data = w9966_i2c_rbyte(cam)) == -1)
return -1;
w9966_i2c_setsda(cam, 0);
if (!w9966_i2c_setscl(cam, 1))
return -1;
w9966_i2c_setsda(cam, 1);
return data;
}
// Write a register to the i2c device.
// Expects claimed pdev.
// 1 on success, else 0
static int w9966_i2c_wreg(struct w9966_dev* cam, int device, int reg, int data)
{
w9966_i2c_setsda(cam, 0);
w9966_i2c_setscl(cam, 0);
if (!w9966_i2c_wbyte(cam, device << 1) ||
!w9966_i2c_wbyte(cam, reg) ||
!w9966_i2c_wbyte(cam, data))
return 0;
w9966_i2c_setsda(cam, 0);
if (!w9966_i2c_setscl(cam, 1))
return 0;
w9966_i2c_setsda(cam, 1);
return 1;
}
/*
* Video4linux interface
*/
static int w9966_v4l_open(struct video_device *vdev, int flags)
{
struct w9966_dev *cam = (struct w9966_dev*)vdev->priv;
// Claim parport
if (!w9966_pdev_claim(cam)) {
DPRINTF("Unable to claim parport");
return -EFAULT;
}
// Allocate read buffer
cam->buffer = (u8*)kmalloc(W9966_RBUFFER, GFP_KERNEL);
if (cam->buffer == NULL) {
w9966_pdev_release(cam);
return -ENOMEM;
}
w9966_flag_set(cam, W9966_STATE_BUFFER);
return 0;
}
static void w9966_v4l_close(struct video_device *vdev)
{
struct w9966_dev *cam = (struct w9966_dev*)vdev->priv;
// Free read buffer
if (w9966_flag_test(cam, W9966_STATE_BUFFER)) {
kfree(cam->buffer);
w9966_flag_clear(cam, W9966_STATE_BUFFER);
}
// release parport
w9966_pdev_release(cam);
}
// expects a claimed parport
static int w9966_v4l_ioctl(struct video_device *vdev, unsigned int cmd, void *arg)
{
struct w9966_dev *cam = (struct w9966_dev*)vdev->priv;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability vcap = {
W9966_DRIVERNAME, // name
VID_TYPE_CAPTURE | VID_TYPE_SCALES, // type
1, 0, // vid, aud channels
cam->max_x - cam->min_x,
cam->max_y - cam->min_y,
W9966_WND_MIN_W,
W9966_WND_MIN_H
};
if(copy_to_user(arg, &vcap, sizeof(vcap)) != 0)
return -EFAULT;
return 0;
}
case VIDIOCGCHAN:
{
struct video_channel vch;
if(copy_from_user(&vch, arg, sizeof(vch)) != 0)
return -EFAULT;
if(vch.channel != 0) // We only support one channel (#0)
return -EINVAL;
strcpy(vch.name, "CCD-input");
vch.flags = 0; // We have no tuner or audio
vch.tuners = 0;
vch.type = VIDEO_TYPE_CAMERA;
vch.norm = 0; // ???
if(copy_to_user(arg, &vch, sizeof(vch)) != 0)
return -EFAULT;
return 0;
}
case VIDIOCSCHAN:
{
struct video_channel vch;
if(copy_from_user(&vch, arg, sizeof(vch) ) != 0)
return -EFAULT;
if(vch.channel != 0)
return -EINVAL;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner vtune;
if(copy_from_user(&vtune, arg, sizeof(vtune)) != 0)
return -EFAULT;
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;
if(copy_to_user(arg, &vtune, sizeof(vtune)) != 0)
return -EFAULT;
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner vtune;
if (copy_from_user(&vtune, arg, sizeof(vtune)) != 0)
return -EFAULT;
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
};
if(copy_to_user(arg, &vpic, sizeof(vpic)) != 0)
return -EFAULT;
return 0;
}
case VIDIOCSPICT:
{
struct video_picture vpic;
if(copy_from_user(&vpic, arg, sizeof(vpic)) != 0)
return -EFAULT;
if (vpic.depth != 16 || vpic.palette != VIDEO_PALETTE_YUV422)
return -EINVAL;
cam->brightness = vpic.brightness >> 8;
cam->hue = (vpic.hue >> 8) - 128;
cam->color = vpic.colour >> 9;
cam->contrast = vpic.contrast >> 9;
if (!cam->image(cam))
return -EFAULT;
return 0;
}
case VIDIOCSWIN:
{
struct video_window vwin;
if (copy_from_user(&vwin, arg, sizeof(vwin)) != 0)
return -EFAULT;
if (
vwin.flags != 0 ||
vwin.clipcount != 0)
return -EINVAL;
if (vwin.width > cam->max_x - cam->min_x ||
vwin.height > cam->max_y - cam->min_y ||
vwin.width < W9966_WND_MIN_W ||
vwin.height < W9966_WND_MIN_H)
return -EINVAL;
// Update camera regs
if (!w9966_window(cam, 0, 0, 1023, 1023, vwin.width, vwin.height))
return -EFAULT;
return 0;
}
case VIDIOCGWIN:
{
struct video_window vwin;
memset(&vwin, 0, sizeof(vwin));
vwin.width = cam->width;
vwin.height = cam->height;
if(copy_to_user(arg, &vwin, sizeof(vwin)) != 0)
return -EFAULT;
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;
}
// Capture data
// expects a claimed parport and allocated read buffer
static long w9966_v4l_read(struct video_device *vdev, char *buf, unsigned long count, int noblock)
{
struct w9966_dev *cam = (struct w9966_dev *)vdev->priv;
const u8 addr = 0xa0; // ECP, read, CCD-transfer, 00000
u8* dest = (u8*)buf;
unsigned long dleft = count;
// Why would anyone want more than this??
if (count > cam->width * cam->height * 2)
count = cam->width * cam->height * 2;
w9966_wreg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
w9966_wreg(cam, 0x00, 0x00); // Return to normal operation
w9966_wreg(cam, 0x01, cam->cmask | 0x80); // 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) {
DPRINTF("Unable to write capture-addr.\n");
return -EFAULT;
}
while(dleft > 0)
{
const size_t tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
if (parport_read(cam->pport, cam->buffer, tsize) < tsize)
return -EFAULT;
if (copy_to_user(dest, cam->buffer, tsize) != 0)
return -EFAULT;
dest += tsize;
dleft -= tsize;
}
w9966_wreg(cam, 0x01, cam->cmask); // Disable capture
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 (strcmp(pardev[i], "none") == 0 || // Skip if 'none' or if
w9966_cams[i].dev_state != 0) // cam already assigned
continue;
if (strcmp(pardev[i], "auto") == 0 ||
strcmp(pardev[i], port->name) == 0) {
if (!w9966_init(&w9966_cams[i], port, video_nr[i]))
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 = {
W9966_DRIVERNAME,
w9966_attach,
w9966_detach,
NULL
};
// Module entry point
static int __init w9966_mod_init(void)
{
int i, err;
w9966_cams = kmalloc(
sizeof(struct w9966_dev) * W9966_MAXCAMS, GFP_KERNEL);
if (!w9966_cams)
return -ENOMEM;
for (i = 0; i < W9966_MAXCAMS; i++)
w9966_cams[i].dev_state = 0;
// Register parport driver
if ((err = parport_register_driver(&w9966_ppd)) != 0) {
kfree(w9966_cams);
w9966_cams = 0;
return err;
}
return 0;
}
// Module cleanup
static void __exit w9966_mod_term(void)
{
if (w9966_cams)
kfree(w9966_cams);
parport_unregister_driver(&w9966_ppd);
}
module_init(w9966_mod_init);
module_exit(w9966_mod_term);
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