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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/video/w9966.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/media/video/w9966.c')
-rw-r--r--drivers/media/video/w9966.c984
1 files changed, 984 insertions, 0 deletions
diff --git a/drivers/media/video/w9966.c b/drivers/media/video/w9966.c
new file mode 100644
index 000000000000..c318ba32fbaf
--- /dev/null
+++ b/drivers/media/video/w9966.c
@@ -0,0 +1,984 @@
+/*
+ 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 <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 struct file_operations w9966_fops = {
+ .owner = THIS_MODULE,
+ .open = video_exclusive_open,
+ .release = video_exclusive_release,
+ .ioctl = w9966_v4l_ioctl,
+ .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,
+ .hardware = VID_HARDWARE_W9966,
+ .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)
+ 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);