2 Winbond w9966cf Webcam parport driver.
6 Copyright (C) 2001 Jakob Kemi <jakob.kemi@post.utfors.se>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *Lifeview FlyCam Supra (using the Philips saa7111a chip)
26 Does any other model using the w9966 interface chip exist ?
30 *Add a working EPP mode, since DMA ECP read isn't implemented
31 in the parport drivers. (That's why it's so sloow)
33 *Add support for other ccd-control chips than the saa7111
34 please send me feedback on what kind of chips you have.
36 *Add proper probing. I don't know what's wrong with the IEEE1284
37 parport drivers but (IEEE1284_MODE_NIBBLE|IEEE1284_DEVICE_ID)
38 and nibble read seems to be broken for some peripherals.
40 *Add probing for onboard SRAM, port directions etc. (if possible)
42 *Add support for the hardware compressed modes (maybe using v4l2)
44 *Fix better support for the capture window (no skewed images, v4l
45 interface to capt. window)
47 *Probably some bugs that I don't know of
49 Please support me by sending feedback!
53 Alan Cox: Removed RGB mode for kernel merge, added THIS_MODULE
54 and owner support for newer module locks
57 #include <linux/module.h>
58 #include <linux/init.h>
59 #include <linux/delay.h>
60 #include <linux/videodev2.h>
61 #include <media/v4l2-common.h>
62 #include <media/v4l2-ioctl.h>
63 #include <linux/parport.h>
65 /*#define DEBUG*/ /* Undef me for production */
68 #define DPRINTF(x, a...) printk(KERN_DEBUG "W9966: %s(): "x, __func__ , ##a)
74 * Defines, simple typedefs etc.
77 #define W9966_DRIVERNAME "W9966CF Webcam"
78 #define W9966_MAXCAMS 4 // Maximum number of cameras
79 #define W9966_RBUFFER 2048 // Read buffer (must be an even number)
80 #define W9966_SRAMSIZE 131072 // 128kb
81 #define W9966_SRAMID 0x02 // check w9966cf.pdf
83 // Empirically determined window limits
84 #define W9966_WND_MIN_X 16
85 #define W9966_WND_MIN_Y 14
86 #define W9966_WND_MAX_X 705
87 #define W9966_WND_MAX_Y 253
88 #define W9966_WND_MAX_W (W9966_WND_MAX_X - W9966_WND_MIN_X)
89 #define W9966_WND_MAX_H (W9966_WND_MAX_Y - W9966_WND_MIN_Y)
91 // Keep track of our current state
92 #define W9966_STATE_PDEV 0x01
93 #define W9966_STATE_CLAIMED 0x02
94 #define W9966_STATE_VDEV 0x04
96 #define W9966_I2C_W_ID 0x48
97 #define W9966_I2C_R_ID 0x49
98 #define W9966_I2C_R_DATA 0x08
99 #define W9966_I2C_R_CLOCK 0x04
100 #define W9966_I2C_W_DATA 0x02
101 #define W9966_I2C_W_CLOCK 0x01
104 unsigned char dev_state;
105 unsigned char i2c_state;
106 unsigned short ppmode;
107 struct parport* pport;
108 struct pardevice* pdev;
109 struct video_device vdev;
110 unsigned short width;
111 unsigned short height;
112 unsigned char brightness;
113 signed char contrast;
116 unsigned long in_use;
120 * Module specific properties
123 MODULE_AUTHOR("Jakob Kemi <jakob.kemi@post.utfors.se>");
124 MODULE_DESCRIPTION("Winbond w9966cf WebCam driver (0.32)");
125 MODULE_LICENSE("GPL");
129 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = ""};
131 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = "aggressive"};
133 module_param_array(pardev, charp, NULL, 0);
134 MODULE_PARM_DESC(pardev, "pardev: where to search for\n\
135 \teach camera. 'aggressive' means brute-force search.\n\
136 \tEg: >pardev=parport3,aggressive,parport2,parport1< would assign\n\
137 \tcam 1 to parport3 and search every parport for cam 2 etc...");
140 module_param(parmode, int, 0);
141 MODULE_PARM_DESC(parmode, "parmode: transfer mode (0=auto, 1=ecp, 2=epp");
143 static int video_nr = -1;
144 module_param(video_nr, int, 0);
150 static struct w9966_dev w9966_cams[W9966_MAXCAMS];
153 * Private function declares
156 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val);
157 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val);
158 static inline void w9966_pdev_claim(struct w9966_dev *vdev);
159 static inline void w9966_pdev_release(struct w9966_dev *vdev);
161 static int w9966_rReg(struct w9966_dev* cam, int reg);
162 static int w9966_wReg(struct w9966_dev* cam, int reg, int data);
164 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg);
166 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data);
167 static int w9966_findlen(int near, int size, int maxlen);
168 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor);
169 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h);
171 static int w9966_init(struct w9966_dev* cam, struct parport* port);
172 static void w9966_term(struct w9966_dev* cam);
174 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state);
175 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state);
176 static inline int w9966_i2c_getsda(struct w9966_dev* cam);
177 static inline int w9966_i2c_getscl(struct w9966_dev* cam);
178 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data);
180 static int w9966_i2c_rbyte(struct w9966_dev* cam);
183 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
184 unsigned int cmd, unsigned long arg);
185 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
186 size_t count, loff_t *ppos);
188 static int w9966_exclusive_open(struct inode *inode, struct file *file)
190 struct video_device *vdev = video_devdata(file);
191 struct w9966_dev *cam = vdev->priv;
193 return test_and_set_bit(0, &cam->in_use) ? -EBUSY : 0;
196 static int w9966_exclusive_release(struct inode *inode, struct file *file)
198 struct video_device *vdev = video_devdata(file);
199 struct w9966_dev *cam = vdev->priv;
201 clear_bit(0, &cam->in_use);
205 static const struct file_operations w9966_fops = {
206 .owner = THIS_MODULE,
207 .open = w9966_exclusive_open,
208 .release = w9966_exclusive_release,
209 .ioctl = w9966_v4l_ioctl,
211 .compat_ioctl = v4l_compat_ioctl32,
213 .read = w9966_v4l_read,
216 static struct video_device w9966_template = {
217 .name = W9966_DRIVERNAME,
219 .release = video_device_release_empty,
223 * Private function defines
227 // Set camera phase flags, so we know what to uninit when terminating
228 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val)
230 cam->dev_state = (cam->dev_state & ~mask) ^ val;
233 // Get camera phase flags
234 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val)
236 return ((cam->dev_state & mask) == val);
239 // Claim parport for ourself
240 static inline void w9966_pdev_claim(struct w9966_dev* cam)
242 if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED))
244 parport_claim_or_block(cam->pdev);
245 w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED);
248 // Release parport for others to use
249 static inline void w9966_pdev_release(struct w9966_dev* cam)
251 if (w9966_getState(cam, W9966_STATE_CLAIMED, 0))
253 parport_release(cam->pdev);
254 w9966_setState(cam, W9966_STATE_CLAIMED, 0);
257 // Read register from W9966 interface-chip
258 // Expects a claimed pdev
259 // -1 on error, else register data (byte)
260 static int w9966_rReg(struct w9966_dev* cam, int reg)
262 // ECP, read, regtransfer, REG, REG, REG, REG, REG
263 const unsigned char addr = 0x80 | (reg & 0x1f);
266 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
268 if (parport_write(cam->pport, &addr, 1) != 1)
270 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
272 if (parport_read(cam->pport, &val, 1) != 1)
278 // Write register to W9966 interface-chip
279 // Expects a claimed pdev
281 static int w9966_wReg(struct w9966_dev* cam, int reg, int data)
283 // ECP, write, regtransfer, REG, REG, REG, REG, REG
284 const unsigned char addr = 0xc0 | (reg & 0x1f);
285 const unsigned char val = data;
287 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
289 if (parport_write(cam->pport, &addr, 1) != 1)
291 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
293 if (parport_write(cam->pport, &val, 1) != 1)
299 // Initialize camera device. Setup all internal flags, set a
300 // default video mode, setup ccd-chip, register v4l device etc..
301 // Also used for 'probing' of hardware.
303 static int w9966_init(struct w9966_dev* cam, struct parport* port)
305 if (cam->dev_state != 0)
309 cam->brightness = 128;
314 // Select requested transfer mode
317 default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
319 if (port->modes & PARPORT_MODE_ECP)
320 cam->ppmode = IEEE1284_MODE_ECP;
321 else if (port->modes & PARPORT_MODE_EPP)
322 cam->ppmode = IEEE1284_MODE_EPP;
324 cam->ppmode = IEEE1284_MODE_ECP;
326 case 1: // hw- or sw-ecp
327 cam->ppmode = IEEE1284_MODE_ECP;
329 case 2: // hw- or sw-epp
330 cam->ppmode = IEEE1284_MODE_EPP;
334 // Tell the parport driver that we exists
335 cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL);
336 if (cam->pdev == NULL) {
337 DPRINTF("parport_register_device() failed\n");
340 w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV);
342 w9966_pdev_claim(cam);
344 // Setup a default capture mode
345 if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) {
346 DPRINTF("w9966_setup() failed.\n");
350 w9966_pdev_release(cam);
352 // Fill in the video_device struct and register us to v4l
353 memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device));
354 cam->vdev.priv = cam;
356 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0)
359 w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV);
363 "w9966cf: Found and initialized a webcam on %s.\n",
370 // Terminate everything gracefully
371 static void w9966_term(struct w9966_dev* cam)
373 // Unregister from v4l
374 if (w9966_getState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) {
375 video_unregister_device(&cam->vdev);
376 w9966_setState(cam, W9966_STATE_VDEV, 0);
379 // Terminate from IEEE1284 mode and release pdev block
380 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
381 w9966_pdev_claim(cam);
382 parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
383 w9966_pdev_release(cam);
386 // Unregister from parport
387 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
388 parport_unregister_device(cam->pdev);
389 w9966_setState(cam, W9966_STATE_PDEV, 0);
394 // Find a good length for capture window (used both for W and H)
395 // A bit ugly but pretty functional. The capture length
396 // have to match the downscale
397 static int w9966_findlen(int near, int size, int maxlen)
400 int besterr = abs(near - bestlen);
403 for(len = size+1;len < maxlen;len++)
406 if ( ((64*size) %len) != 0)
409 err = abs(near - len);
411 // Only continue as long as we keep getting better values
422 // Modify capture window (if necessary)
423 // and calculate downscaling
424 // Return -1 on error
425 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor)
427 int maxlen = max - min;
428 int len = *end - *beg + 1;
429 int newlen = w9966_findlen(len, size, maxlen);
430 int err = newlen - len;
432 // Check for bad format
433 if (newlen > maxlen || newlen < size)
436 // Set factor (6 bit fixed)
437 *factor = (64*size) / newlen;
439 *factor = 0x00; // downscale is disabled
441 *factor |= 0x80; // set downscale-enable bit
443 // Modify old beginning and end
445 *end += err - (err / 2);
447 // Move window if outside borders
460 // Setup the cameras capture window etc.
461 // Expects a claimed pdev
462 // return -1 on error
463 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
466 unsigned int enh_s, enh_e;
467 unsigned char scale_x, scale_y;
468 unsigned char regs[0x1c];
469 unsigned char saa7111_regs[] = {
470 0x21, 0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00,
471 0x88, 0x10, 0x80, 0x40, 0x40, 0x00, 0x01, 0x00,
472 0x48, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
473 0x00, 0x00, 0x00, 0x71, 0xe7, 0x00, 0x00, 0xc0
477 if (w*h*2 > W9966_SRAMSIZE)
479 DPRINTF("capture window exceeds SRAM size!.\n");
480 w = 200; h = 160; // Pick default values
486 if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W;
487 if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H;
495 // Modify capture window if necessary and calculate downscaling
497 w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 ||
498 w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0
502 "%dx%d, x: %d<->%d, y: %d<->%d, sx: %d/64, sy: %d/64.\n",
503 w, h, x1, x2, y1, y2, scale_x&~0x80, scale_y&~0x80
507 regs[0x00] = 0x00; // Set normal operation
508 regs[0x01] = 0x18; // Capture mode
509 regs[0x02] = scale_y; // V-scaling
510 regs[0x03] = scale_x; // H-scaling
513 regs[0x04] = (x1 & 0x0ff); // X-start (8 low bits)
514 regs[0x05] = (x1 & 0x300)>>8; // X-start (2 high bits)
515 regs[0x06] = (y1 & 0x0ff); // Y-start (8 low bits)
516 regs[0x07] = (y1 & 0x300)>>8; // Y-start (2 high bits)
517 regs[0x08] = (x2 & 0x0ff); // X-end (8 low bits)
518 regs[0x09] = (x2 & 0x300)>>8; // X-end (2 high bits)
519 regs[0x0a] = (y2 & 0x0ff); // Y-end (8 low bits)
521 regs[0x0c] = W9966_SRAMID; // SRAM-banks (1x 128kb)
524 regs[0x0d] = (enh_s& 0x000ff); // Enh. start (0-7)
525 regs[0x0e] = (enh_s& 0x0ff00)>>8; // Enh. start (8-15)
526 regs[0x0f] = (enh_s& 0x70000)>>16; // Enh. start (16-17/18??)
527 regs[0x10] = (enh_e& 0x000ff); // Enh. end (0-7)
528 regs[0x11] = (enh_e& 0x0ff00)>>8; // Enh. end (8-15)
529 regs[0x12] = (enh_e& 0x70000)>>16; // Enh. end (16-17/18??)
532 regs[0x13] = 0x40; // VEE control (raw 4:2:2)
533 regs[0x17] = 0x00; // ???
534 regs[0x18] = cam->i2c_state = 0x00; // Serial bus
535 regs[0x19] = 0xff; // I/O port direction control
536 regs[0x1a] = 0xff; // I/O port data register
537 regs[0x1b] = 0x10; // ???
539 // SAA7111 chip settings
540 saa7111_regs[0x0a] = cam->brightness;
541 saa7111_regs[0x0b] = cam->contrast;
542 saa7111_regs[0x0c] = cam->color;
543 saa7111_regs[0x0d] = cam->hue;
545 // Reset (ECP-fifo & serial-bus)
546 if (w9966_wReg(cam, 0x00, 0x03) == -1)
549 // Write regs to w9966cf chip
550 for (i = 0; i < 0x1c; i++)
551 if (w9966_wReg(cam, i, regs[i]) == -1)
554 // Write regs to saa7111 chip
555 for (i = 0; i < 0x20; i++)
556 if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1)
563 * Ugly and primitive i2c protocol functions
566 // Sets the data line on the i2c bus.
567 // Expects a claimed pdev.
568 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state)
571 cam->i2c_state |= W9966_I2C_W_DATA;
573 cam->i2c_state &= ~W9966_I2C_W_DATA;
575 w9966_wReg(cam, 0x18, cam->i2c_state);
579 // Get peripheral clock line
580 // Expects a claimed pdev.
581 static inline int w9966_i2c_getscl(struct w9966_dev* cam)
583 const unsigned char state = w9966_rReg(cam, 0x18);
584 return ((state & W9966_I2C_R_CLOCK) > 0);
587 // Sets the clock line on the i2c bus.
588 // Expects a claimed pdev. -1 on error
589 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
591 unsigned long timeout;
594 cam->i2c_state |= W9966_I2C_W_CLOCK;
596 cam->i2c_state &= ~W9966_I2C_W_CLOCK;
598 w9966_wReg(cam, 0x18, cam->i2c_state);
601 // we go to high, we also expect the peripheral to ack.
603 timeout = jiffies + 100;
604 while (!w9966_i2c_getscl(cam)) {
605 if (time_after(jiffies, timeout))
612 // Get peripheral data line
613 // Expects a claimed pdev.
614 static inline int w9966_i2c_getsda(struct w9966_dev* cam)
616 const unsigned char state = w9966_rReg(cam, 0x18);
617 return ((state & W9966_I2C_R_DATA) > 0);
620 // Write a byte with ack to the i2c bus.
621 // Expects a claimed pdev. -1 on error
622 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data)
625 for (i = 7; i >= 0; i--)
627 w9966_i2c_setsda(cam, (data >> i) & 0x01);
629 if (w9966_i2c_setscl(cam, 1) == -1)
631 w9966_i2c_setscl(cam, 0);
634 w9966_i2c_setsda(cam, 1);
636 if (w9966_i2c_setscl(cam, 1) == -1)
638 w9966_i2c_setscl(cam, 0);
643 // Read a data byte with ack from the i2c-bus
644 // Expects a claimed pdev. -1 on error
646 static int w9966_i2c_rbyte(struct w9966_dev* cam)
648 unsigned char data = 0x00;
651 w9966_i2c_setsda(cam, 1);
653 for (i = 0; i < 8; i++)
655 if (w9966_i2c_setscl(cam, 1) == -1)
658 if (w9966_i2c_getsda(cam))
661 w9966_i2c_setscl(cam, 0);
667 // Read a register from the i2c device.
668 // Expects claimed pdev. -1 on error
670 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg)
674 w9966_i2c_setsda(cam, 0);
675 w9966_i2c_setscl(cam, 0);
678 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
679 w9966_i2c_wbyte(cam, reg) == -1
683 w9966_i2c_setsda(cam, 1);
684 if (w9966_i2c_setscl(cam, 1) == -1)
686 w9966_i2c_setsda(cam, 0);
687 w9966_i2c_setscl(cam, 0);
690 w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 ||
691 (data = w9966_i2c_rbyte(cam)) == -1
695 w9966_i2c_setsda(cam, 0);
697 if (w9966_i2c_setscl(cam, 1) == -1)
699 w9966_i2c_setsda(cam, 1);
705 // Write a register to the i2c device.
706 // Expects claimed pdev. -1 on error
707 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data)
709 w9966_i2c_setsda(cam, 0);
710 w9966_i2c_setscl(cam, 0);
713 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
714 w9966_i2c_wbyte(cam, reg) == -1 ||
715 w9966_i2c_wbyte(cam, data) == -1
719 w9966_i2c_setsda(cam, 0);
720 if (w9966_i2c_setscl(cam, 1) == -1)
723 w9966_i2c_setsda(cam, 1);
729 * Video4linux interfacing
732 static int w9966_v4l_do_ioctl(struct inode *inode, struct file *file,
733 unsigned int cmd, void *arg)
735 struct video_device *vdev = video_devdata(file);
736 struct w9966_dev *cam = vdev->priv;
742 static struct video_capability vcap = {
743 .name = W9966_DRIVERNAME,
744 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
746 .maxwidth = W9966_WND_MAX_W,
747 .maxheight = W9966_WND_MAX_H,
751 struct video_capability *cap = arg;
757 struct video_channel *vch = arg;
758 if(vch->channel != 0) // We only support one channel (#0)
760 memset(vch,0,sizeof(*vch));
761 strcpy(vch->name, "CCD-input");
762 vch->type = VIDEO_TYPE_CAMERA;
767 struct video_channel *vch = arg;
768 if(vch->channel != 0)
774 struct video_tuner *vtune = arg;
775 if(vtune->tuner != 0)
777 strcpy(vtune->name, "no tuner");
779 vtune->rangehigh = 0;
780 vtune->flags = VIDEO_TUNER_NORM;
781 vtune->mode = VIDEO_MODE_AUTO;
782 vtune->signal = 0xffff;
787 struct video_tuner *vtune = arg;
788 if (vtune->tuner != 0)
790 if (vtune->mode != VIDEO_MODE_AUTO)
796 struct video_picture vpic = {
797 cam->brightness << 8, // brightness
798 (cam->hue + 128) << 8, // hue
799 cam->color << 9, // color
800 cam->contrast << 9, // contrast
802 16, VIDEO_PALETTE_YUV422// bpp, palette format
804 struct video_picture *pic = arg;
810 struct video_picture *vpic = arg;
811 if (vpic->depth != 16 || (vpic->palette != VIDEO_PALETTE_YUV422 && vpic->palette != VIDEO_PALETTE_YUYV))
814 cam->brightness = vpic->brightness >> 8;
815 cam->hue = (vpic->hue >> 8) - 128;
816 cam->color = vpic->colour >> 9;
817 cam->contrast = vpic->contrast >> 9;
819 w9966_pdev_claim(cam);
822 w9966_wReg_i2c(cam, 0x0a, cam->brightness) == -1 ||
823 w9966_wReg_i2c(cam, 0x0b, cam->contrast) == -1 ||
824 w9966_wReg_i2c(cam, 0x0c, cam->color) == -1 ||
825 w9966_wReg_i2c(cam, 0x0d, cam->hue) == -1
827 w9966_pdev_release(cam);
831 w9966_pdev_release(cam);
837 struct video_window *vwin = arg;
839 if (vwin->flags != 0)
841 if (vwin->clipcount != 0)
843 if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W)
845 if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H)
848 // Update camera regs
849 w9966_pdev_claim(cam);
850 ret = w9966_setup(cam, 0, 0, 1023, 1023, vwin->width, vwin->height);
851 w9966_pdev_release(cam);
854 DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n");
862 struct video_window *vwin = arg;
863 memset(vwin, 0, sizeof(*vwin));
864 vwin->width = cam->width;
865 vwin->height = cam->height;
884 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
885 unsigned int cmd, unsigned long arg)
887 return video_usercopy(inode, file, cmd, arg, w9966_v4l_do_ioctl);
891 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
892 size_t count, loff_t *ppos)
894 struct video_device *vdev = video_devdata(file);
895 struct w9966_dev *cam = vdev->priv;
896 unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000
897 unsigned char __user *dest = (unsigned char __user *)buf;
898 unsigned long dleft = count;
901 // Why would anyone want more than this??
902 if (count > cam->width * cam->height * 2)
905 w9966_pdev_claim(cam);
906 w9966_wReg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
907 w9966_wReg(cam, 0x00, 0x00); // Return to normal operation
908 w9966_wReg(cam, 0x01, 0x98); // Enable capture
910 // write special capture-addr and negotiate into data transfer
912 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_ADDR) != 0 )||
913 (parport_write(cam->pport, &addr, 1) != 1 )||
914 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_DATA) != 0 )
916 w9966_pdev_release(cam);
920 tbuf = kmalloc(W9966_RBUFFER, GFP_KERNEL);
928 unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
930 if (parport_read(cam->pport, tbuf, tsize) < tsize) {
934 if (copy_to_user(dest, tbuf, tsize) != 0) {
942 w9966_wReg(cam, 0x01, 0x18); // Disable capture
946 w9966_pdev_release(cam);
952 // Called once for every parport on init
953 static void w9966_attach(struct parport *port)
957 for (i = 0; i < W9966_MAXCAMS; i++)
959 if (w9966_cams[i].dev_state != 0) // Cam is already assigned
962 strcmp(pardev[i], "aggressive") == 0 ||
963 strcmp(pardev[i], port->name) == 0
965 if (w9966_init(&w9966_cams[i], port) != 0)
966 w9966_term(&w9966_cams[i]);
972 // Called once for every parport on termination
973 static void w9966_detach(struct parport *port)
976 for (i = 0; i < W9966_MAXCAMS; i++)
977 if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port)
978 w9966_term(&w9966_cams[i]);
982 static struct parport_driver w9966_ppd = {
983 .name = W9966_DRIVERNAME,
984 .attach = w9966_attach,
985 .detach = w9966_detach,
988 // Module entry point
989 static int __init w9966_mod_init(void)
992 for (i = 0; i < W9966_MAXCAMS; i++)
993 w9966_cams[i].dev_state = 0;
995 return parport_register_driver(&w9966_ppd);
999 static void __exit w9966_mod_term(void)
1001 parport_unregister_driver(&w9966_ppd);
1004 module_init(w9966_mod_init);
1005 module_exit(w9966_mod_term);