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/videodev.h>
61 #include <media/v4l2-common.h>
62 #include <linux/parport.h>
64 /*#define DEBUG*/ /* Undef me for production */
67 #define DPRINTF(x, a...) printk(KERN_DEBUG "W9966: %s(): "x, __func__ , ##a)
73 * Defines, simple typedefs etc.
76 #define W9966_DRIVERNAME "W9966CF Webcam"
77 #define W9966_MAXCAMS 4 // Maximum number of cameras
78 #define W9966_RBUFFER 2048 // Read buffer (must be an even number)
79 #define W9966_SRAMSIZE 131072 // 128kb
80 #define W9966_SRAMID 0x02 // check w9966cf.pdf
82 // Empirically determined window limits
83 #define W9966_WND_MIN_X 16
84 #define W9966_WND_MIN_Y 14
85 #define W9966_WND_MAX_X 705
86 #define W9966_WND_MAX_Y 253
87 #define W9966_WND_MAX_W (W9966_WND_MAX_X - W9966_WND_MIN_X)
88 #define W9966_WND_MAX_H (W9966_WND_MAX_Y - W9966_WND_MIN_Y)
90 // Keep track of our current state
91 #define W9966_STATE_PDEV 0x01
92 #define W9966_STATE_CLAIMED 0x02
93 #define W9966_STATE_VDEV 0x04
95 #define W9966_I2C_W_ID 0x48
96 #define W9966_I2C_R_ID 0x49
97 #define W9966_I2C_R_DATA 0x08
98 #define W9966_I2C_R_CLOCK 0x04
99 #define W9966_I2C_W_DATA 0x02
100 #define W9966_I2C_W_CLOCK 0x01
103 unsigned char dev_state;
104 unsigned char i2c_state;
105 unsigned short ppmode;
106 struct parport* pport;
107 struct pardevice* pdev;
108 struct video_device vdev;
109 unsigned short width;
110 unsigned short height;
111 unsigned char brightness;
112 signed char contrast;
118 * Module specific properties
121 MODULE_AUTHOR("Jakob Kemi <jakob.kemi@post.utfors.se>");
122 MODULE_DESCRIPTION("Winbond w9966cf WebCam driver (0.32)");
123 MODULE_LICENSE("GPL");
127 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = ""};
129 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = "aggressive"};
131 module_param_array(pardev, charp, NULL, 0);
132 MODULE_PARM_DESC(pardev, "pardev: where to search for\n\
133 \teach camera. 'aggressive' means brute-force search.\n\
134 \tEg: >pardev=parport3,aggressive,parport2,parport1< would assign\n\
135 \tcam 1 to parport3 and search every parport for cam 2 etc...");
138 module_param(parmode, int, 0);
139 MODULE_PARM_DESC(parmode, "parmode: transfer mode (0=auto, 1=ecp, 2=epp");
141 static int video_nr = -1;
142 module_param(video_nr, int, 0);
148 static struct w9966_dev w9966_cams[W9966_MAXCAMS];
151 * Private function declares
154 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val);
155 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val);
156 static inline void w9966_pdev_claim(struct w9966_dev *vdev);
157 static inline void w9966_pdev_release(struct w9966_dev *vdev);
159 static int w9966_rReg(struct w9966_dev* cam, int reg);
160 static int w9966_wReg(struct w9966_dev* cam, int reg, int data);
162 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg);
164 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data);
165 static int w9966_findlen(int near, int size, int maxlen);
166 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor);
167 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h);
169 static int w9966_init(struct w9966_dev* cam, struct parport* port);
170 static void w9966_term(struct w9966_dev* cam);
172 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state);
173 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state);
174 static inline int w9966_i2c_getsda(struct w9966_dev* cam);
175 static inline int w9966_i2c_getscl(struct w9966_dev* cam);
176 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data);
178 static int w9966_i2c_rbyte(struct w9966_dev* cam);
181 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
182 unsigned int cmd, unsigned long arg);
183 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
184 size_t count, loff_t *ppos);
186 static const struct file_operations w9966_fops = {
187 .owner = THIS_MODULE,
188 .open = video_exclusive_open,
189 .release = video_exclusive_release,
190 .ioctl = w9966_v4l_ioctl,
192 .compat_ioctl = v4l_compat_ioctl32,
194 .read = w9966_v4l_read,
197 static struct video_device w9966_template = {
198 .owner = THIS_MODULE,
199 .name = W9966_DRIVERNAME,
200 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
205 * Private function defines
209 // Set camera phase flags, so we know what to uninit when terminating
210 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val)
212 cam->dev_state = (cam->dev_state & ~mask) ^ val;
215 // Get camera phase flags
216 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val)
218 return ((cam->dev_state & mask) == val);
221 // Claim parport for ourself
222 static inline void w9966_pdev_claim(struct w9966_dev* cam)
224 if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED))
226 parport_claim_or_block(cam->pdev);
227 w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED);
230 // Release parport for others to use
231 static inline void w9966_pdev_release(struct w9966_dev* cam)
233 if (w9966_getState(cam, W9966_STATE_CLAIMED, 0))
235 parport_release(cam->pdev);
236 w9966_setState(cam, W9966_STATE_CLAIMED, 0);
239 // Read register from W9966 interface-chip
240 // Expects a claimed pdev
241 // -1 on error, else register data (byte)
242 static int w9966_rReg(struct w9966_dev* cam, int reg)
244 // ECP, read, regtransfer, REG, REG, REG, REG, REG
245 const unsigned char addr = 0x80 | (reg & 0x1f);
248 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
250 if (parport_write(cam->pport, &addr, 1) != 1)
252 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
254 if (parport_read(cam->pport, &val, 1) != 1)
260 // Write register to W9966 interface-chip
261 // Expects a claimed pdev
263 static int w9966_wReg(struct w9966_dev* cam, int reg, int data)
265 // ECP, write, regtransfer, REG, REG, REG, REG, REG
266 const unsigned char addr = 0xc0 | (reg & 0x1f);
267 const unsigned char val = data;
269 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
271 if (parport_write(cam->pport, &addr, 1) != 1)
273 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
275 if (parport_write(cam->pport, &val, 1) != 1)
281 // Initialize camera device. Setup all internal flags, set a
282 // default video mode, setup ccd-chip, register v4l device etc..
283 // Also used for 'probing' of hardware.
285 static int w9966_init(struct w9966_dev* cam, struct parport* port)
287 if (cam->dev_state != 0)
291 cam->brightness = 128;
296 // Select requested transfer mode
299 default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
301 if (port->modes & PARPORT_MODE_ECP)
302 cam->ppmode = IEEE1284_MODE_ECP;
303 else if (port->modes & PARPORT_MODE_EPP)
304 cam->ppmode = IEEE1284_MODE_EPP;
306 cam->ppmode = IEEE1284_MODE_ECP;
308 case 1: // hw- or sw-ecp
309 cam->ppmode = IEEE1284_MODE_ECP;
311 case 2: // hw- or sw-epp
312 cam->ppmode = IEEE1284_MODE_EPP;
316 // Tell the parport driver that we exists
317 cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL);
318 if (cam->pdev == NULL) {
319 DPRINTF("parport_register_device() failed\n");
322 w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV);
324 w9966_pdev_claim(cam);
326 // Setup a default capture mode
327 if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) {
328 DPRINTF("w9966_setup() failed.\n");
332 w9966_pdev_release(cam);
334 // Fill in the video_device struct and register us to v4l
335 memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device));
336 cam->vdev.priv = cam;
338 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) == -1)
341 w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV);
345 "w9966cf: Found and initialized a webcam on %s.\n",
352 // Terminate everything gracefully
353 static void w9966_term(struct w9966_dev* cam)
355 // Unregister from v4l
356 if (w9966_getState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) {
357 video_unregister_device(&cam->vdev);
358 w9966_setState(cam, W9966_STATE_VDEV, 0);
361 // Terminate from IEEE1284 mode and release pdev block
362 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
363 w9966_pdev_claim(cam);
364 parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
365 w9966_pdev_release(cam);
368 // Unregister from parport
369 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
370 parport_unregister_device(cam->pdev);
371 w9966_setState(cam, W9966_STATE_PDEV, 0);
376 // Find a good length for capture window (used both for W and H)
377 // A bit ugly but pretty functional. The capture length
378 // have to match the downscale
379 static int w9966_findlen(int near, int size, int maxlen)
382 int besterr = abs(near - bestlen);
385 for(len = size+1;len < maxlen;len++)
388 if ( ((64*size) %len) != 0)
391 err = abs(near - len);
393 // Only continue as long as we keep getting better values
404 // Modify capture window (if necessary)
405 // and calculate downscaling
406 // Return -1 on error
407 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor)
409 int maxlen = max - min;
410 int len = *end - *beg + 1;
411 int newlen = w9966_findlen(len, size, maxlen);
412 int err = newlen - len;
414 // Check for bad format
415 if (newlen > maxlen || newlen < size)
418 // Set factor (6 bit fixed)
419 *factor = (64*size) / newlen;
421 *factor = 0x00; // downscale is disabled
423 *factor |= 0x80; // set downscale-enable bit
425 // Modify old beginning and end
427 *end += err - (err / 2);
429 // Move window if outside borders
442 // Setup the cameras capture window etc.
443 // Expects a claimed pdev
444 // return -1 on error
445 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
448 unsigned int enh_s, enh_e;
449 unsigned char scale_x, scale_y;
450 unsigned char regs[0x1c];
451 unsigned char saa7111_regs[] = {
452 0x21, 0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00,
453 0x88, 0x10, 0x80, 0x40, 0x40, 0x00, 0x01, 0x00,
454 0x48, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
455 0x00, 0x00, 0x00, 0x71, 0xe7, 0x00, 0x00, 0xc0
459 if (w*h*2 > W9966_SRAMSIZE)
461 DPRINTF("capture window exceeds SRAM size!.\n");
462 w = 200; h = 160; // Pick default values
468 if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W;
469 if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H;
477 // Modify capture window if necessary and calculate downscaling
479 w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 ||
480 w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0
484 "%dx%d, x: %d<->%d, y: %d<->%d, sx: %d/64, sy: %d/64.\n",
485 w, h, x1, x2, y1, y2, scale_x&~0x80, scale_y&~0x80
489 regs[0x00] = 0x00; // Set normal operation
490 regs[0x01] = 0x18; // Capture mode
491 regs[0x02] = scale_y; // V-scaling
492 regs[0x03] = scale_x; // H-scaling
495 regs[0x04] = (x1 & 0x0ff); // X-start (8 low bits)
496 regs[0x05] = (x1 & 0x300)>>8; // X-start (2 high bits)
497 regs[0x06] = (y1 & 0x0ff); // Y-start (8 low bits)
498 regs[0x07] = (y1 & 0x300)>>8; // Y-start (2 high bits)
499 regs[0x08] = (x2 & 0x0ff); // X-end (8 low bits)
500 regs[0x09] = (x2 & 0x300)>>8; // X-end (2 high bits)
501 regs[0x0a] = (y2 & 0x0ff); // Y-end (8 low bits)
503 regs[0x0c] = W9966_SRAMID; // SRAM-banks (1x 128kb)
506 regs[0x0d] = (enh_s& 0x000ff); // Enh. start (0-7)
507 regs[0x0e] = (enh_s& 0x0ff00)>>8; // Enh. start (8-15)
508 regs[0x0f] = (enh_s& 0x70000)>>16; // Enh. start (16-17/18??)
509 regs[0x10] = (enh_e& 0x000ff); // Enh. end (0-7)
510 regs[0x11] = (enh_e& 0x0ff00)>>8; // Enh. end (8-15)
511 regs[0x12] = (enh_e& 0x70000)>>16; // Enh. end (16-17/18??)
514 regs[0x13] = 0x40; // VEE control (raw 4:2:2)
515 regs[0x17] = 0x00; // ???
516 regs[0x18] = cam->i2c_state = 0x00; // Serial bus
517 regs[0x19] = 0xff; // I/O port direction control
518 regs[0x1a] = 0xff; // I/O port data register
519 regs[0x1b] = 0x10; // ???
521 // SAA7111 chip settings
522 saa7111_regs[0x0a] = cam->brightness;
523 saa7111_regs[0x0b] = cam->contrast;
524 saa7111_regs[0x0c] = cam->color;
525 saa7111_regs[0x0d] = cam->hue;
527 // Reset (ECP-fifo & serial-bus)
528 if (w9966_wReg(cam, 0x00, 0x03) == -1)
531 // Write regs to w9966cf chip
532 for (i = 0; i < 0x1c; i++)
533 if (w9966_wReg(cam, i, regs[i]) == -1)
536 // Write regs to saa7111 chip
537 for (i = 0; i < 0x20; i++)
538 if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1)
545 * Ugly and primitive i2c protocol functions
548 // Sets the data line on the i2c bus.
549 // Expects a claimed pdev.
550 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state)
553 cam->i2c_state |= W9966_I2C_W_DATA;
555 cam->i2c_state &= ~W9966_I2C_W_DATA;
557 w9966_wReg(cam, 0x18, cam->i2c_state);
561 // Get peripheral clock line
562 // Expects a claimed pdev.
563 static inline int w9966_i2c_getscl(struct w9966_dev* cam)
565 const unsigned char state = w9966_rReg(cam, 0x18);
566 return ((state & W9966_I2C_R_CLOCK) > 0);
569 // Sets the clock line on the i2c bus.
570 // Expects a claimed pdev. -1 on error
571 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
573 unsigned long timeout;
576 cam->i2c_state |= W9966_I2C_W_CLOCK;
578 cam->i2c_state &= ~W9966_I2C_W_CLOCK;
580 w9966_wReg(cam, 0x18, cam->i2c_state);
583 // we go to high, we also expect the peripheral to ack.
585 timeout = jiffies + 100;
586 while (!w9966_i2c_getscl(cam)) {
587 if (time_after(jiffies, timeout))
594 // Get peripheral data line
595 // Expects a claimed pdev.
596 static inline int w9966_i2c_getsda(struct w9966_dev* cam)
598 const unsigned char state = w9966_rReg(cam, 0x18);
599 return ((state & W9966_I2C_R_DATA) > 0);
602 // Write a byte with ack to the i2c bus.
603 // Expects a claimed pdev. -1 on error
604 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data)
607 for (i = 7; i >= 0; i--)
609 w9966_i2c_setsda(cam, (data >> i) & 0x01);
611 if (w9966_i2c_setscl(cam, 1) == -1)
613 w9966_i2c_setscl(cam, 0);
616 w9966_i2c_setsda(cam, 1);
618 if (w9966_i2c_setscl(cam, 1) == -1)
620 w9966_i2c_setscl(cam, 0);
625 // Read a data byte with ack from the i2c-bus
626 // Expects a claimed pdev. -1 on error
628 static int w9966_i2c_rbyte(struct w9966_dev* cam)
630 unsigned char data = 0x00;
633 w9966_i2c_setsda(cam, 1);
635 for (i = 0; i < 8; i++)
637 if (w9966_i2c_setscl(cam, 1) == -1)
640 if (w9966_i2c_getsda(cam))
643 w9966_i2c_setscl(cam, 0);
649 // Read a register from the i2c device.
650 // Expects claimed pdev. -1 on error
652 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg)
656 w9966_i2c_setsda(cam, 0);
657 w9966_i2c_setscl(cam, 0);
660 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
661 w9966_i2c_wbyte(cam, reg) == -1
665 w9966_i2c_setsda(cam, 1);
666 if (w9966_i2c_setscl(cam, 1) == -1)
668 w9966_i2c_setsda(cam, 0);
669 w9966_i2c_setscl(cam, 0);
672 w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 ||
673 (data = w9966_i2c_rbyte(cam)) == -1
677 w9966_i2c_setsda(cam, 0);
679 if (w9966_i2c_setscl(cam, 1) == -1)
681 w9966_i2c_setsda(cam, 1);
687 // Write a register to the i2c device.
688 // Expects claimed pdev. -1 on error
689 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data)
691 w9966_i2c_setsda(cam, 0);
692 w9966_i2c_setscl(cam, 0);
695 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
696 w9966_i2c_wbyte(cam, reg) == -1 ||
697 w9966_i2c_wbyte(cam, data) == -1
701 w9966_i2c_setsda(cam, 0);
702 if (w9966_i2c_setscl(cam, 1) == -1)
705 w9966_i2c_setsda(cam, 1);
711 * Video4linux interfacing
714 static int w9966_v4l_do_ioctl(struct inode *inode, struct file *file,
715 unsigned int cmd, void *arg)
717 struct video_device *vdev = video_devdata(file);
718 struct w9966_dev *cam = vdev->priv;
724 static struct video_capability vcap = {
725 .name = W9966_DRIVERNAME,
726 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
728 .maxwidth = W9966_WND_MAX_W,
729 .maxheight = W9966_WND_MAX_H,
733 struct video_capability *cap = arg;
739 struct video_channel *vch = arg;
740 if(vch->channel != 0) // We only support one channel (#0)
742 memset(vch,0,sizeof(*vch));
743 strcpy(vch->name, "CCD-input");
744 vch->type = VIDEO_TYPE_CAMERA;
749 struct video_channel *vch = arg;
750 if(vch->channel != 0)
756 struct video_tuner *vtune = arg;
757 if(vtune->tuner != 0)
759 strcpy(vtune->name, "no tuner");
761 vtune->rangehigh = 0;
762 vtune->flags = VIDEO_TUNER_NORM;
763 vtune->mode = VIDEO_MODE_AUTO;
764 vtune->signal = 0xffff;
769 struct video_tuner *vtune = arg;
770 if (vtune->tuner != 0)
772 if (vtune->mode != VIDEO_MODE_AUTO)
778 struct video_picture vpic = {
779 cam->brightness << 8, // brightness
780 (cam->hue + 128) << 8, // hue
781 cam->color << 9, // color
782 cam->contrast << 9, // contrast
784 16, VIDEO_PALETTE_YUV422// bpp, palette format
786 struct video_picture *pic = arg;
792 struct video_picture *vpic = arg;
793 if (vpic->depth != 16 || (vpic->palette != VIDEO_PALETTE_YUV422 && vpic->palette != VIDEO_PALETTE_YUYV))
796 cam->brightness = vpic->brightness >> 8;
797 cam->hue = (vpic->hue >> 8) - 128;
798 cam->color = vpic->colour >> 9;
799 cam->contrast = vpic->contrast >> 9;
801 w9966_pdev_claim(cam);
804 w9966_wReg_i2c(cam, 0x0a, cam->brightness) == -1 ||
805 w9966_wReg_i2c(cam, 0x0b, cam->contrast) == -1 ||
806 w9966_wReg_i2c(cam, 0x0c, cam->color) == -1 ||
807 w9966_wReg_i2c(cam, 0x0d, cam->hue) == -1
809 w9966_pdev_release(cam);
813 w9966_pdev_release(cam);
819 struct video_window *vwin = arg;
821 if (vwin->flags != 0)
823 if (vwin->clipcount != 0)
825 if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W)
827 if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H)
830 // Update camera regs
831 w9966_pdev_claim(cam);
832 ret = w9966_setup(cam, 0, 0, 1023, 1023, vwin->width, vwin->height);
833 w9966_pdev_release(cam);
836 DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n");
844 struct video_window *vwin = arg;
845 memset(vwin, 0, sizeof(*vwin));
846 vwin->width = cam->width;
847 vwin->height = cam->height;
866 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
867 unsigned int cmd, unsigned long arg)
869 return video_usercopy(inode, file, cmd, arg, w9966_v4l_do_ioctl);
873 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
874 size_t count, loff_t *ppos)
876 struct video_device *vdev = video_devdata(file);
877 struct w9966_dev *cam = vdev->priv;
878 unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000
879 unsigned char __user *dest = (unsigned char __user *)buf;
880 unsigned long dleft = count;
883 // Why would anyone want more than this??
884 if (count > cam->width * cam->height * 2)
887 w9966_pdev_claim(cam);
888 w9966_wReg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
889 w9966_wReg(cam, 0x00, 0x00); // Return to normal operation
890 w9966_wReg(cam, 0x01, 0x98); // Enable capture
892 // write special capture-addr and negotiate into data transfer
894 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_ADDR) != 0 )||
895 (parport_write(cam->pport, &addr, 1) != 1 )||
896 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_DATA) != 0 )
898 w9966_pdev_release(cam);
902 tbuf = kmalloc(W9966_RBUFFER, GFP_KERNEL);
910 unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
912 if (parport_read(cam->pport, tbuf, tsize) < tsize) {
916 if (copy_to_user(dest, tbuf, tsize) != 0) {
924 w9966_wReg(cam, 0x01, 0x18); // Disable capture
928 w9966_pdev_release(cam);
934 // Called once for every parport on init
935 static void w9966_attach(struct parport *port)
939 for (i = 0; i < W9966_MAXCAMS; i++)
941 if (w9966_cams[i].dev_state != 0) // Cam is already assigned
944 strcmp(pardev[i], "aggressive") == 0 ||
945 strcmp(pardev[i], port->name) == 0
947 if (w9966_init(&w9966_cams[i], port) != 0)
948 w9966_term(&w9966_cams[i]);
954 // Called once for every parport on termination
955 static void w9966_detach(struct parport *port)
958 for (i = 0; i < W9966_MAXCAMS; i++)
959 if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port)
960 w9966_term(&w9966_cams[i]);
964 static struct parport_driver w9966_ppd = {
965 .name = W9966_DRIVERNAME,
966 .attach = w9966_attach,
967 .detach = w9966_detach,
970 // Module entry point
971 static int __init w9966_mod_init(void)
974 for (i = 0; i < W9966_MAXCAMS; i++)
975 w9966_cams[i].dev_state = 0;
977 return parport_register_driver(&w9966_ppd);
981 static void __exit w9966_mod_term(void)
983 parport_unregister_driver(&w9966_ppd);
986 module_init(w9966_mod_init);
987 module_exit(w9966_mod_term);