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 long w9966_v4l_ioctl(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 file *file)
190 struct w9966_dev *cam = video_drvdata(file);
192 return test_and_set_bit(0, &cam->in_use) ? -EBUSY : 0;
195 static int w9966_exclusive_release(struct file *file)
197 struct w9966_dev *cam = video_drvdata(file);
199 clear_bit(0, &cam->in_use);
203 static const struct v4l2_file_operations w9966_fops = {
204 .owner = THIS_MODULE,
205 .open = w9966_exclusive_open,
206 .release = w9966_exclusive_release,
207 .ioctl = w9966_v4l_ioctl,
208 .read = w9966_v4l_read,
210 static struct video_device w9966_template = {
211 .name = W9966_DRIVERNAME,
213 .release = video_device_release_empty,
217 * Private function defines
221 // Set camera phase flags, so we know what to uninit when terminating
222 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val)
224 cam->dev_state = (cam->dev_state & ~mask) ^ val;
227 // Get camera phase flags
228 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val)
230 return ((cam->dev_state & mask) == val);
233 // Claim parport for ourself
234 static inline void w9966_pdev_claim(struct w9966_dev* cam)
236 if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED))
238 parport_claim_or_block(cam->pdev);
239 w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED);
242 // Release parport for others to use
243 static inline void w9966_pdev_release(struct w9966_dev* cam)
245 if (w9966_getState(cam, W9966_STATE_CLAIMED, 0))
247 parport_release(cam->pdev);
248 w9966_setState(cam, W9966_STATE_CLAIMED, 0);
251 // Read register from W9966 interface-chip
252 // Expects a claimed pdev
253 // -1 on error, else register data (byte)
254 static int w9966_rReg(struct w9966_dev* cam, int reg)
256 // ECP, read, regtransfer, REG, REG, REG, REG, REG
257 const unsigned char addr = 0x80 | (reg & 0x1f);
260 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
262 if (parport_write(cam->pport, &addr, 1) != 1)
264 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
266 if (parport_read(cam->pport, &val, 1) != 1)
272 // Write register to W9966 interface-chip
273 // Expects a claimed pdev
275 static int w9966_wReg(struct w9966_dev* cam, int reg, int data)
277 // ECP, write, regtransfer, REG, REG, REG, REG, REG
278 const unsigned char addr = 0xc0 | (reg & 0x1f);
279 const unsigned char val = data;
281 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
283 if (parport_write(cam->pport, &addr, 1) != 1)
285 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
287 if (parport_write(cam->pport, &val, 1) != 1)
293 // Initialize camera device. Setup all internal flags, set a
294 // default video mode, setup ccd-chip, register v4l device etc..
295 // Also used for 'probing' of hardware.
297 static int w9966_init(struct w9966_dev* cam, struct parport* port)
299 if (cam->dev_state != 0)
303 cam->brightness = 128;
308 // Select requested transfer mode
311 default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
313 if (port->modes & PARPORT_MODE_ECP)
314 cam->ppmode = IEEE1284_MODE_ECP;
315 else if (port->modes & PARPORT_MODE_EPP)
316 cam->ppmode = IEEE1284_MODE_EPP;
318 cam->ppmode = IEEE1284_MODE_ECP;
320 case 1: // hw- or sw-ecp
321 cam->ppmode = IEEE1284_MODE_ECP;
323 case 2: // hw- or sw-epp
324 cam->ppmode = IEEE1284_MODE_EPP;
328 // Tell the parport driver that we exists
329 cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL);
330 if (cam->pdev == NULL) {
331 DPRINTF("parport_register_device() failed\n");
334 w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV);
336 w9966_pdev_claim(cam);
338 // Setup a default capture mode
339 if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) {
340 DPRINTF("w9966_setup() failed.\n");
344 w9966_pdev_release(cam);
346 // Fill in the video_device struct and register us to v4l
347 memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device));
348 video_set_drvdata(&cam->vdev, cam);
350 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0)
353 w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV);
357 "w9966cf: Found and initialized a webcam on %s.\n",
364 // Terminate everything gracefully
365 static void w9966_term(struct w9966_dev* cam)
367 // Unregister from v4l
368 if (w9966_getState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) {
369 video_unregister_device(&cam->vdev);
370 w9966_setState(cam, W9966_STATE_VDEV, 0);
373 // Terminate from IEEE1284 mode and release pdev block
374 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
375 w9966_pdev_claim(cam);
376 parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
377 w9966_pdev_release(cam);
380 // Unregister from parport
381 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
382 parport_unregister_device(cam->pdev);
383 w9966_setState(cam, W9966_STATE_PDEV, 0);
388 // Find a good length for capture window (used both for W and H)
389 // A bit ugly but pretty functional. The capture length
390 // have to match the downscale
391 static int w9966_findlen(int near, int size, int maxlen)
394 int besterr = abs(near - bestlen);
397 for(len = size+1;len < maxlen;len++)
400 if ( ((64*size) %len) != 0)
403 err = abs(near - len);
405 // Only continue as long as we keep getting better values
416 // Modify capture window (if necessary)
417 // and calculate downscaling
418 // Return -1 on error
419 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor)
421 int maxlen = max - min;
422 int len = *end - *beg + 1;
423 int newlen = w9966_findlen(len, size, maxlen);
424 int err = newlen - len;
426 // Check for bad format
427 if (newlen > maxlen || newlen < size)
430 // Set factor (6 bit fixed)
431 *factor = (64*size) / newlen;
433 *factor = 0x00; // downscale is disabled
435 *factor |= 0x80; // set downscale-enable bit
437 // Modify old beginning and end
439 *end += err - (err / 2);
441 // Move window if outside borders
454 // Setup the cameras capture window etc.
455 // Expects a claimed pdev
456 // return -1 on error
457 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
460 unsigned int enh_s, enh_e;
461 unsigned char scale_x, scale_y;
462 unsigned char regs[0x1c];
463 unsigned char saa7111_regs[] = {
464 0x21, 0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00,
465 0x88, 0x10, 0x80, 0x40, 0x40, 0x00, 0x01, 0x00,
466 0x48, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
467 0x00, 0x00, 0x00, 0x71, 0xe7, 0x00, 0x00, 0xc0
471 if (w*h*2 > W9966_SRAMSIZE)
473 DPRINTF("capture window exceeds SRAM size!.\n");
474 w = 200; h = 160; // Pick default values
480 if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W;
481 if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H;
489 // Modify capture window if necessary and calculate downscaling
491 w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 ||
492 w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0
496 "%dx%d, x: %d<->%d, y: %d<->%d, sx: %d/64, sy: %d/64.\n",
497 w, h, x1, x2, y1, y2, scale_x&~0x80, scale_y&~0x80
501 regs[0x00] = 0x00; // Set normal operation
502 regs[0x01] = 0x18; // Capture mode
503 regs[0x02] = scale_y; // V-scaling
504 regs[0x03] = scale_x; // H-scaling
507 regs[0x04] = (x1 & 0x0ff); // X-start (8 low bits)
508 regs[0x05] = (x1 & 0x300)>>8; // X-start (2 high bits)
509 regs[0x06] = (y1 & 0x0ff); // Y-start (8 low bits)
510 regs[0x07] = (y1 & 0x300)>>8; // Y-start (2 high bits)
511 regs[0x08] = (x2 & 0x0ff); // X-end (8 low bits)
512 regs[0x09] = (x2 & 0x300)>>8; // X-end (2 high bits)
513 regs[0x0a] = (y2 & 0x0ff); // Y-end (8 low bits)
515 regs[0x0c] = W9966_SRAMID; // SRAM-banks (1x 128kb)
518 regs[0x0d] = (enh_s& 0x000ff); // Enh. start (0-7)
519 regs[0x0e] = (enh_s& 0x0ff00)>>8; // Enh. start (8-15)
520 regs[0x0f] = (enh_s& 0x70000)>>16; // Enh. start (16-17/18??)
521 regs[0x10] = (enh_e& 0x000ff); // Enh. end (0-7)
522 regs[0x11] = (enh_e& 0x0ff00)>>8; // Enh. end (8-15)
523 regs[0x12] = (enh_e& 0x70000)>>16; // Enh. end (16-17/18??)
526 regs[0x13] = 0x40; // VEE control (raw 4:2:2)
527 regs[0x17] = 0x00; // ???
528 regs[0x18] = cam->i2c_state = 0x00; // Serial bus
529 regs[0x19] = 0xff; // I/O port direction control
530 regs[0x1a] = 0xff; // I/O port data register
531 regs[0x1b] = 0x10; // ???
533 // SAA7111 chip settings
534 saa7111_regs[0x0a] = cam->brightness;
535 saa7111_regs[0x0b] = cam->contrast;
536 saa7111_regs[0x0c] = cam->color;
537 saa7111_regs[0x0d] = cam->hue;
539 // Reset (ECP-fifo & serial-bus)
540 if (w9966_wReg(cam, 0x00, 0x03) == -1)
543 // Write regs to w9966cf chip
544 for (i = 0; i < 0x1c; i++)
545 if (w9966_wReg(cam, i, regs[i]) == -1)
548 // Write regs to saa7111 chip
549 for (i = 0; i < 0x20; i++)
550 if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1)
557 * Ugly and primitive i2c protocol functions
560 // Sets the data line on the i2c bus.
561 // Expects a claimed pdev.
562 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state)
565 cam->i2c_state |= W9966_I2C_W_DATA;
567 cam->i2c_state &= ~W9966_I2C_W_DATA;
569 w9966_wReg(cam, 0x18, cam->i2c_state);
573 // Get peripheral clock line
574 // Expects a claimed pdev.
575 static inline int w9966_i2c_getscl(struct w9966_dev* cam)
577 const unsigned char state = w9966_rReg(cam, 0x18);
578 return ((state & W9966_I2C_R_CLOCK) > 0);
581 // Sets the clock line on the i2c bus.
582 // Expects a claimed pdev. -1 on error
583 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
585 unsigned long timeout;
588 cam->i2c_state |= W9966_I2C_W_CLOCK;
590 cam->i2c_state &= ~W9966_I2C_W_CLOCK;
592 w9966_wReg(cam, 0x18, cam->i2c_state);
595 // we go to high, we also expect the peripheral to ack.
597 timeout = jiffies + 100;
598 while (!w9966_i2c_getscl(cam)) {
599 if (time_after(jiffies, timeout))
606 // Get peripheral data line
607 // Expects a claimed pdev.
608 static inline int w9966_i2c_getsda(struct w9966_dev* cam)
610 const unsigned char state = w9966_rReg(cam, 0x18);
611 return ((state & W9966_I2C_R_DATA) > 0);
614 // Write a byte with ack to the i2c bus.
615 // Expects a claimed pdev. -1 on error
616 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data)
619 for (i = 7; i >= 0; i--)
621 w9966_i2c_setsda(cam, (data >> i) & 0x01);
623 if (w9966_i2c_setscl(cam, 1) == -1)
625 w9966_i2c_setscl(cam, 0);
628 w9966_i2c_setsda(cam, 1);
630 if (w9966_i2c_setscl(cam, 1) == -1)
632 w9966_i2c_setscl(cam, 0);
637 // Read a data byte with ack from the i2c-bus
638 // Expects a claimed pdev. -1 on error
640 static int w9966_i2c_rbyte(struct w9966_dev* cam)
642 unsigned char data = 0x00;
645 w9966_i2c_setsda(cam, 1);
647 for (i = 0; i < 8; i++)
649 if (w9966_i2c_setscl(cam, 1) == -1)
652 if (w9966_i2c_getsda(cam))
655 w9966_i2c_setscl(cam, 0);
661 // Read a register from the i2c device.
662 // Expects claimed pdev. -1 on error
664 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg)
668 w9966_i2c_setsda(cam, 0);
669 w9966_i2c_setscl(cam, 0);
672 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
673 w9966_i2c_wbyte(cam, reg) == -1
677 w9966_i2c_setsda(cam, 1);
678 if (w9966_i2c_setscl(cam, 1) == -1)
680 w9966_i2c_setsda(cam, 0);
681 w9966_i2c_setscl(cam, 0);
684 w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 ||
685 (data = w9966_i2c_rbyte(cam)) == -1
689 w9966_i2c_setsda(cam, 0);
691 if (w9966_i2c_setscl(cam, 1) == -1)
693 w9966_i2c_setsda(cam, 1);
699 // Write a register to the i2c device.
700 // Expects claimed pdev. -1 on error
701 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data)
703 w9966_i2c_setsda(cam, 0);
704 w9966_i2c_setscl(cam, 0);
707 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
708 w9966_i2c_wbyte(cam, reg) == -1 ||
709 w9966_i2c_wbyte(cam, data) == -1
713 w9966_i2c_setsda(cam, 0);
714 if (w9966_i2c_setscl(cam, 1) == -1)
717 w9966_i2c_setsda(cam, 1);
723 * Video4linux interfacing
726 static long w9966_v4l_do_ioctl(struct file *file, unsigned int cmd, void *arg)
728 struct w9966_dev *cam = video_drvdata(file);
734 static struct video_capability vcap = {
735 .name = W9966_DRIVERNAME,
736 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
738 .maxwidth = W9966_WND_MAX_W,
739 .maxheight = W9966_WND_MAX_H,
743 struct video_capability *cap = arg;
749 struct video_channel *vch = arg;
750 if(vch->channel != 0) // We only support one channel (#0)
752 memset(vch,0,sizeof(*vch));
753 strcpy(vch->name, "CCD-input");
754 vch->type = VIDEO_TYPE_CAMERA;
759 struct video_channel *vch = arg;
760 if(vch->channel != 0)
766 struct video_tuner *vtune = arg;
767 if(vtune->tuner != 0)
769 strcpy(vtune->name, "no tuner");
771 vtune->rangehigh = 0;
772 vtune->flags = VIDEO_TUNER_NORM;
773 vtune->mode = VIDEO_MODE_AUTO;
774 vtune->signal = 0xffff;
779 struct video_tuner *vtune = arg;
780 if (vtune->tuner != 0)
782 if (vtune->mode != VIDEO_MODE_AUTO)
788 struct video_picture vpic = {
789 cam->brightness << 8, // brightness
790 (cam->hue + 128) << 8, // hue
791 cam->color << 9, // color
792 cam->contrast << 9, // contrast
794 16, VIDEO_PALETTE_YUV422// bpp, palette format
796 struct video_picture *pic = arg;
802 struct video_picture *vpic = arg;
803 if (vpic->depth != 16 || (vpic->palette != VIDEO_PALETTE_YUV422 && vpic->palette != VIDEO_PALETTE_YUYV))
806 cam->brightness = vpic->brightness >> 8;
807 cam->hue = (vpic->hue >> 8) - 128;
808 cam->color = vpic->colour >> 9;
809 cam->contrast = vpic->contrast >> 9;
811 w9966_pdev_claim(cam);
814 w9966_wReg_i2c(cam, 0x0a, cam->brightness) == -1 ||
815 w9966_wReg_i2c(cam, 0x0b, cam->contrast) == -1 ||
816 w9966_wReg_i2c(cam, 0x0c, cam->color) == -1 ||
817 w9966_wReg_i2c(cam, 0x0d, cam->hue) == -1
819 w9966_pdev_release(cam);
823 w9966_pdev_release(cam);
829 struct video_window *vwin = arg;
831 if (vwin->flags != 0)
833 if (vwin->clipcount != 0)
835 if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W)
837 if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H)
840 // Update camera regs
841 w9966_pdev_claim(cam);
842 ret = w9966_setup(cam, 0, 0, 1023, 1023, vwin->width, vwin->height);
843 w9966_pdev_release(cam);
846 DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n");
854 struct video_window *vwin = arg;
855 memset(vwin, 0, sizeof(*vwin));
856 vwin->width = cam->width;
857 vwin->height = cam->height;
876 static long w9966_v4l_ioctl(struct file *file,
877 unsigned int cmd, unsigned long arg)
879 return video_usercopy(file, cmd, arg, w9966_v4l_do_ioctl);
883 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
884 size_t count, loff_t *ppos)
886 struct w9966_dev *cam = video_drvdata(file);
887 unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000
888 unsigned char __user *dest = (unsigned char __user *)buf;
889 unsigned long dleft = count;
892 // Why would anyone want more than this??
893 if (count > cam->width * cam->height * 2)
896 w9966_pdev_claim(cam);
897 w9966_wReg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
898 w9966_wReg(cam, 0x00, 0x00); // Return to normal operation
899 w9966_wReg(cam, 0x01, 0x98); // Enable capture
901 // write special capture-addr and negotiate into data transfer
903 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_ADDR) != 0 )||
904 (parport_write(cam->pport, &addr, 1) != 1 )||
905 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_DATA) != 0 )
907 w9966_pdev_release(cam);
911 tbuf = kmalloc(W9966_RBUFFER, GFP_KERNEL);
919 unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
921 if (parport_read(cam->pport, tbuf, tsize) < tsize) {
925 if (copy_to_user(dest, tbuf, tsize) != 0) {
933 w9966_wReg(cam, 0x01, 0x18); // Disable capture
937 w9966_pdev_release(cam);
943 // Called once for every parport on init
944 static void w9966_attach(struct parport *port)
948 for (i = 0; i < W9966_MAXCAMS; i++)
950 if (w9966_cams[i].dev_state != 0) // Cam is already assigned
953 strcmp(pardev[i], "aggressive") == 0 ||
954 strcmp(pardev[i], port->name) == 0
956 if (w9966_init(&w9966_cams[i], port) != 0)
957 w9966_term(&w9966_cams[i]);
963 // Called once for every parport on termination
964 static void w9966_detach(struct parport *port)
967 for (i = 0; i < W9966_MAXCAMS; i++)
968 if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port)
969 w9966_term(&w9966_cams[i]);
973 static struct parport_driver w9966_ppd = {
974 .name = W9966_DRIVERNAME,
975 .attach = w9966_attach,
976 .detach = w9966_detach,
979 // Module entry point
980 static int __init w9966_mod_init(void)
983 for (i = 0; i < W9966_MAXCAMS; i++)
984 w9966_cams[i].dev_state = 0;
986 return parport_register_driver(&w9966_ppd);
990 static void __exit w9966_mod_term(void)
992 parport_unregister_driver(&w9966_ppd);
995 module_init(w9966_mod_init);
996 module_exit(w9966_mod_term);