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V4L/DVB (9296): Patch to remove warning message during cx88-dvb compilation
[deliverable/linux.git] / drivers / media / video / w9966.c
1 /*
2 Winbond w9966cf Webcam parport driver.
3
4 Version 0.32
5
6 Copyright (C) 2001 Jakob Kemi <jakob.kemi@post.utfors.se>
7
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.
12
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.
17
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.
21 */
22 /*
23 Supported devices:
24 *Lifeview FlyCam Supra (using the Philips saa7111a chip)
25
26 Does any other model using the w9966 interface chip exist ?
27
28 Todo:
29
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)
32
33 *Add support for other ccd-control chips than the saa7111
34 please send me feedback on what kind of chips you have.
35
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.
39
40 *Add probing for onboard SRAM, port directions etc. (if possible)
41
42 *Add support for the hardware compressed modes (maybe using v4l2)
43
44 *Fix better support for the capture window (no skewed images, v4l
45 interface to capt. window)
46
47 *Probably some bugs that I don't know of
48
49 Please support me by sending feedback!
50
51 Changes:
52
53 Alan Cox: Removed RGB mode for kernel merge, added THIS_MODULE
54 and owner support for newer module locks
55 */
56
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>
64
65 /*#define DEBUG*/ /* Undef me for production */
66
67 #ifdef DEBUG
68 #define DPRINTF(x, a...) printk(KERN_DEBUG "W9966: %s(): "x, __func__ , ##a)
69 #else
70 #define DPRINTF(x...)
71 #endif
72
73 /*
74 * Defines, simple typedefs etc.
75 */
76
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
82
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)
90
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
95
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
102
103 struct w9966_dev {
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;
114 signed char color;
115 signed char hue;
116 unsigned long in_use;
117 };
118
119 /*
120 * Module specific properties
121 */
122
123 MODULE_AUTHOR("Jakob Kemi <jakob.kemi@post.utfors.se>");
124 MODULE_DESCRIPTION("Winbond w9966cf WebCam driver (0.32)");
125 MODULE_LICENSE("GPL");
126
127
128 #ifdef MODULE
129 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = ""};
130 #else
131 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = "aggressive"};
132 #endif
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...");
138
139 static int parmode;
140 module_param(parmode, int, 0);
141 MODULE_PARM_DESC(parmode, "parmode: transfer mode (0=auto, 1=ecp, 2=epp");
142
143 static int video_nr = -1;
144 module_param(video_nr, int, 0);
145
146 /*
147 * Private data
148 */
149
150 static struct w9966_dev w9966_cams[W9966_MAXCAMS];
151
152 /*
153 * Private function declares
154 */
155
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);
160
161 static int w9966_rReg(struct w9966_dev* cam, int reg);
162 static int w9966_wReg(struct w9966_dev* cam, int reg, int data);
163 #if 0
164 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg);
165 #endif
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);
170
171 static int w9966_init(struct w9966_dev* cam, struct parport* port);
172 static void w9966_term(struct w9966_dev* cam);
173
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);
179 #if 0
180 static int w9966_i2c_rbyte(struct w9966_dev* cam);
181 #endif
182
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);
187
188 static int w9966_exclusive_open(struct inode *inode, struct file *file)
189 {
190 struct w9966_dev *cam = video_drvdata(file);
191
192 return test_and_set_bit(0, &cam->in_use) ? -EBUSY : 0;
193 }
194
195 static int w9966_exclusive_release(struct inode *inode, struct file *file)
196 {
197 struct w9966_dev *cam = video_drvdata(file);
198
199 clear_bit(0, &cam->in_use);
200 return 0;
201 }
202
203 static const struct file_operations w9966_fops = {
204 .owner = THIS_MODULE,
205 .open = w9966_exclusive_open,
206 .release = w9966_exclusive_release,
207 .ioctl = w9966_v4l_ioctl,
208 #ifdef CONFIG_COMPAT
209 .compat_ioctl = v4l_compat_ioctl32,
210 #endif
211 .read = w9966_v4l_read,
212 .llseek = no_llseek,
213 };
214 static struct video_device w9966_template = {
215 .name = W9966_DRIVERNAME,
216 .fops = &w9966_fops,
217 .release = video_device_release_empty,
218 };
219
220 /*
221 * Private function defines
222 */
223
224
225 // Set camera phase flags, so we know what to uninit when terminating
226 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val)
227 {
228 cam->dev_state = (cam->dev_state & ~mask) ^ val;
229 }
230
231 // Get camera phase flags
232 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val)
233 {
234 return ((cam->dev_state & mask) == val);
235 }
236
237 // Claim parport for ourself
238 static inline void w9966_pdev_claim(struct w9966_dev* cam)
239 {
240 if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED))
241 return;
242 parport_claim_or_block(cam->pdev);
243 w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED);
244 }
245
246 // Release parport for others to use
247 static inline void w9966_pdev_release(struct w9966_dev* cam)
248 {
249 if (w9966_getState(cam, W9966_STATE_CLAIMED, 0))
250 return;
251 parport_release(cam->pdev);
252 w9966_setState(cam, W9966_STATE_CLAIMED, 0);
253 }
254
255 // Read register from W9966 interface-chip
256 // Expects a claimed pdev
257 // -1 on error, else register data (byte)
258 static int w9966_rReg(struct w9966_dev* cam, int reg)
259 {
260 // ECP, read, regtransfer, REG, REG, REG, REG, REG
261 const unsigned char addr = 0x80 | (reg & 0x1f);
262 unsigned char val;
263
264 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
265 return -1;
266 if (parport_write(cam->pport, &addr, 1) != 1)
267 return -1;
268 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
269 return -1;
270 if (parport_read(cam->pport, &val, 1) != 1)
271 return -1;
272
273 return val;
274 }
275
276 // Write register to W9966 interface-chip
277 // Expects a claimed pdev
278 // -1 on error
279 static int w9966_wReg(struct w9966_dev* cam, int reg, int data)
280 {
281 // ECP, write, regtransfer, REG, REG, REG, REG, REG
282 const unsigned char addr = 0xc0 | (reg & 0x1f);
283 const unsigned char val = data;
284
285 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
286 return -1;
287 if (parport_write(cam->pport, &addr, 1) != 1)
288 return -1;
289 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
290 return -1;
291 if (parport_write(cam->pport, &val, 1) != 1)
292 return -1;
293
294 return 0;
295 }
296
297 // Initialize camera device. Setup all internal flags, set a
298 // default video mode, setup ccd-chip, register v4l device etc..
299 // Also used for 'probing' of hardware.
300 // -1 on error
301 static int w9966_init(struct w9966_dev* cam, struct parport* port)
302 {
303 if (cam->dev_state != 0)
304 return -1;
305
306 cam->pport = port;
307 cam->brightness = 128;
308 cam->contrast = 64;
309 cam->color = 64;
310 cam->hue = 0;
311
312 // Select requested transfer mode
313 switch(parmode)
314 {
315 default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
316 case 0:
317 if (port->modes & PARPORT_MODE_ECP)
318 cam->ppmode = IEEE1284_MODE_ECP;
319 else if (port->modes & PARPORT_MODE_EPP)
320 cam->ppmode = IEEE1284_MODE_EPP;
321 else
322 cam->ppmode = IEEE1284_MODE_ECP;
323 break;
324 case 1: // hw- or sw-ecp
325 cam->ppmode = IEEE1284_MODE_ECP;
326 break;
327 case 2: // hw- or sw-epp
328 cam->ppmode = IEEE1284_MODE_EPP;
329 break;
330 }
331
332 // Tell the parport driver that we exists
333 cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL);
334 if (cam->pdev == NULL) {
335 DPRINTF("parport_register_device() failed\n");
336 return -1;
337 }
338 w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV);
339
340 w9966_pdev_claim(cam);
341
342 // Setup a default capture mode
343 if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) {
344 DPRINTF("w9966_setup() failed.\n");
345 return -1;
346 }
347
348 w9966_pdev_release(cam);
349
350 // Fill in the video_device struct and register us to v4l
351 memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device));
352 video_set_drvdata(&cam->vdev, cam);
353
354 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0)
355 return -1;
356
357 w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV);
358
359 // All ok
360 printk(
361 "w9966cf: Found and initialized a webcam on %s.\n",
362 cam->pport->name
363 );
364 return 0;
365 }
366
367
368 // Terminate everything gracefully
369 static void w9966_term(struct w9966_dev* cam)
370 {
371 // Unregister from v4l
372 if (w9966_getState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) {
373 video_unregister_device(&cam->vdev);
374 w9966_setState(cam, W9966_STATE_VDEV, 0);
375 }
376
377 // Terminate from IEEE1284 mode and release pdev block
378 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
379 w9966_pdev_claim(cam);
380 parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
381 w9966_pdev_release(cam);
382 }
383
384 // Unregister from parport
385 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
386 parport_unregister_device(cam->pdev);
387 w9966_setState(cam, W9966_STATE_PDEV, 0);
388 }
389 }
390
391
392 // Find a good length for capture window (used both for W and H)
393 // A bit ugly but pretty functional. The capture length
394 // have to match the downscale
395 static int w9966_findlen(int near, int size, int maxlen)
396 {
397 int bestlen = size;
398 int besterr = abs(near - bestlen);
399 int len;
400
401 for(len = size+1;len < maxlen;len++)
402 {
403 int err;
404 if ( ((64*size) %len) != 0)
405 continue;
406
407 err = abs(near - len);
408
409 // Only continue as long as we keep getting better values
410 if (err > besterr)
411 break;
412
413 besterr = err;
414 bestlen = len;
415 }
416
417 return bestlen;
418 }
419
420 // Modify capture window (if necessary)
421 // and calculate downscaling
422 // Return -1 on error
423 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor)
424 {
425 int maxlen = max - min;
426 int len = *end - *beg + 1;
427 int newlen = w9966_findlen(len, size, maxlen);
428 int err = newlen - len;
429
430 // Check for bad format
431 if (newlen > maxlen || newlen < size)
432 return -1;
433
434 // Set factor (6 bit fixed)
435 *factor = (64*size) / newlen;
436 if (*factor == 64)
437 *factor = 0x00; // downscale is disabled
438 else
439 *factor |= 0x80; // set downscale-enable bit
440
441 // Modify old beginning and end
442 *beg -= err / 2;
443 *end += err - (err / 2);
444
445 // Move window if outside borders
446 if (*beg < min) {
447 *end += min - *beg;
448 *beg += min - *beg;
449 }
450 if (*end > max) {
451 *beg -= *end - max;
452 *end -= *end - max;
453 }
454
455 return 0;
456 }
457
458 // Setup the cameras capture window etc.
459 // Expects a claimed pdev
460 // return -1 on error
461 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
462 {
463 unsigned int i;
464 unsigned int enh_s, enh_e;
465 unsigned char scale_x, scale_y;
466 unsigned char regs[0x1c];
467 unsigned char saa7111_regs[] = {
468 0x21, 0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00,
469 0x88, 0x10, 0x80, 0x40, 0x40, 0x00, 0x01, 0x00,
470 0x48, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
471 0x00, 0x00, 0x00, 0x71, 0xe7, 0x00, 0x00, 0xc0
472 };
473
474
475 if (w*h*2 > W9966_SRAMSIZE)
476 {
477 DPRINTF("capture window exceeds SRAM size!.\n");
478 w = 200; h = 160; // Pick default values
479 }
480
481 w &= ~0x1;
482 if (w < 2) w = 2;
483 if (h < 1) h = 1;
484 if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W;
485 if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H;
486
487 cam->width = w;
488 cam->height = h;
489
490 enh_s = 0;
491 enh_e = w*h*2;
492
493 // Modify capture window if necessary and calculate downscaling
494 if (
495 w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 ||
496 w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0
497 ) return -1;
498
499 DPRINTF(
500 "%dx%d, x: %d<->%d, y: %d<->%d, sx: %d/64, sy: %d/64.\n",
501 w, h, x1, x2, y1, y2, scale_x&~0x80, scale_y&~0x80
502 );
503
504 // Setup registers
505 regs[0x00] = 0x00; // Set normal operation
506 regs[0x01] = 0x18; // Capture mode
507 regs[0x02] = scale_y; // V-scaling
508 regs[0x03] = scale_x; // H-scaling
509
510 // Capture window
511 regs[0x04] = (x1 & 0x0ff); // X-start (8 low bits)
512 regs[0x05] = (x1 & 0x300)>>8; // X-start (2 high bits)
513 regs[0x06] = (y1 & 0x0ff); // Y-start (8 low bits)
514 regs[0x07] = (y1 & 0x300)>>8; // Y-start (2 high bits)
515 regs[0x08] = (x2 & 0x0ff); // X-end (8 low bits)
516 regs[0x09] = (x2 & 0x300)>>8; // X-end (2 high bits)
517 regs[0x0a] = (y2 & 0x0ff); // Y-end (8 low bits)
518
519 regs[0x0c] = W9966_SRAMID; // SRAM-banks (1x 128kb)
520
521 // Enhancement layer
522 regs[0x0d] = (enh_s& 0x000ff); // Enh. start (0-7)
523 regs[0x0e] = (enh_s& 0x0ff00)>>8; // Enh. start (8-15)
524 regs[0x0f] = (enh_s& 0x70000)>>16; // Enh. start (16-17/18??)
525 regs[0x10] = (enh_e& 0x000ff); // Enh. end (0-7)
526 regs[0x11] = (enh_e& 0x0ff00)>>8; // Enh. end (8-15)
527 regs[0x12] = (enh_e& 0x70000)>>16; // Enh. end (16-17/18??)
528
529 // Misc
530 regs[0x13] = 0x40; // VEE control (raw 4:2:2)
531 regs[0x17] = 0x00; // ???
532 regs[0x18] = cam->i2c_state = 0x00; // Serial bus
533 regs[0x19] = 0xff; // I/O port direction control
534 regs[0x1a] = 0xff; // I/O port data register
535 regs[0x1b] = 0x10; // ???
536
537 // SAA7111 chip settings
538 saa7111_regs[0x0a] = cam->brightness;
539 saa7111_regs[0x0b] = cam->contrast;
540 saa7111_regs[0x0c] = cam->color;
541 saa7111_regs[0x0d] = cam->hue;
542
543 // Reset (ECP-fifo & serial-bus)
544 if (w9966_wReg(cam, 0x00, 0x03) == -1)
545 return -1;
546
547 // Write regs to w9966cf chip
548 for (i = 0; i < 0x1c; i++)
549 if (w9966_wReg(cam, i, regs[i]) == -1)
550 return -1;
551
552 // Write regs to saa7111 chip
553 for (i = 0; i < 0x20; i++)
554 if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1)
555 return -1;
556
557 return 0;
558 }
559
560 /*
561 * Ugly and primitive i2c protocol functions
562 */
563
564 // Sets the data line on the i2c bus.
565 // Expects a claimed pdev.
566 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state)
567 {
568 if (state)
569 cam->i2c_state |= W9966_I2C_W_DATA;
570 else
571 cam->i2c_state &= ~W9966_I2C_W_DATA;
572
573 w9966_wReg(cam, 0x18, cam->i2c_state);
574 udelay(5);
575 }
576
577 // Get peripheral clock line
578 // Expects a claimed pdev.
579 static inline int w9966_i2c_getscl(struct w9966_dev* cam)
580 {
581 const unsigned char state = w9966_rReg(cam, 0x18);
582 return ((state & W9966_I2C_R_CLOCK) > 0);
583 }
584
585 // Sets the clock line on the i2c bus.
586 // Expects a claimed pdev. -1 on error
587 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
588 {
589 unsigned long timeout;
590
591 if (state)
592 cam->i2c_state |= W9966_I2C_W_CLOCK;
593 else
594 cam->i2c_state &= ~W9966_I2C_W_CLOCK;
595
596 w9966_wReg(cam, 0x18, cam->i2c_state);
597 udelay(5);
598
599 // we go to high, we also expect the peripheral to ack.
600 if (state) {
601 timeout = jiffies + 100;
602 while (!w9966_i2c_getscl(cam)) {
603 if (time_after(jiffies, timeout))
604 return -1;
605 }
606 }
607 return 0;
608 }
609
610 // Get peripheral data line
611 // Expects a claimed pdev.
612 static inline int w9966_i2c_getsda(struct w9966_dev* cam)
613 {
614 const unsigned char state = w9966_rReg(cam, 0x18);
615 return ((state & W9966_I2C_R_DATA) > 0);
616 }
617
618 // Write a byte with ack to the i2c bus.
619 // Expects a claimed pdev. -1 on error
620 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data)
621 {
622 int i;
623 for (i = 7; i >= 0; i--)
624 {
625 w9966_i2c_setsda(cam, (data >> i) & 0x01);
626
627 if (w9966_i2c_setscl(cam, 1) == -1)
628 return -1;
629 w9966_i2c_setscl(cam, 0);
630 }
631
632 w9966_i2c_setsda(cam, 1);
633
634 if (w9966_i2c_setscl(cam, 1) == -1)
635 return -1;
636 w9966_i2c_setscl(cam, 0);
637
638 return 0;
639 }
640
641 // Read a data byte with ack from the i2c-bus
642 // Expects a claimed pdev. -1 on error
643 #if 0
644 static int w9966_i2c_rbyte(struct w9966_dev* cam)
645 {
646 unsigned char data = 0x00;
647 int i;
648
649 w9966_i2c_setsda(cam, 1);
650
651 for (i = 0; i < 8; i++)
652 {
653 if (w9966_i2c_setscl(cam, 1) == -1)
654 return -1;
655 data = data << 1;
656 if (w9966_i2c_getsda(cam))
657 data |= 0x01;
658
659 w9966_i2c_setscl(cam, 0);
660 }
661 return data;
662 }
663 #endif
664
665 // Read a register from the i2c device.
666 // Expects claimed pdev. -1 on error
667 #if 0
668 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg)
669 {
670 int data;
671
672 w9966_i2c_setsda(cam, 0);
673 w9966_i2c_setscl(cam, 0);
674
675 if (
676 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
677 w9966_i2c_wbyte(cam, reg) == -1
678 )
679 return -1;
680
681 w9966_i2c_setsda(cam, 1);
682 if (w9966_i2c_setscl(cam, 1) == -1)
683 return -1;
684 w9966_i2c_setsda(cam, 0);
685 w9966_i2c_setscl(cam, 0);
686
687 if (
688 w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 ||
689 (data = w9966_i2c_rbyte(cam)) == -1
690 )
691 return -1;
692
693 w9966_i2c_setsda(cam, 0);
694
695 if (w9966_i2c_setscl(cam, 1) == -1)
696 return -1;
697 w9966_i2c_setsda(cam, 1);
698
699 return data;
700 }
701 #endif
702
703 // Write a register to the i2c device.
704 // Expects claimed pdev. -1 on error
705 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data)
706 {
707 w9966_i2c_setsda(cam, 0);
708 w9966_i2c_setscl(cam, 0);
709
710 if (
711 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
712 w9966_i2c_wbyte(cam, reg) == -1 ||
713 w9966_i2c_wbyte(cam, data) == -1
714 )
715 return -1;
716
717 w9966_i2c_setsda(cam, 0);
718 if (w9966_i2c_setscl(cam, 1) == -1)
719 return -1;
720
721 w9966_i2c_setsda(cam, 1);
722
723 return 0;
724 }
725
726 /*
727 * Video4linux interfacing
728 */
729
730 static int w9966_v4l_do_ioctl(struct inode *inode, struct file *file,
731 unsigned int cmd, void *arg)
732 {
733 struct w9966_dev *cam = video_drvdata(file);
734
735 switch(cmd)
736 {
737 case VIDIOCGCAP:
738 {
739 static struct video_capability vcap = {
740 .name = W9966_DRIVERNAME,
741 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
742 .channels = 1,
743 .maxwidth = W9966_WND_MAX_W,
744 .maxheight = W9966_WND_MAX_H,
745 .minwidth = 2,
746 .minheight = 1,
747 };
748 struct video_capability *cap = arg;
749 *cap = vcap;
750 return 0;
751 }
752 case VIDIOCGCHAN:
753 {
754 struct video_channel *vch = arg;
755 if(vch->channel != 0) // We only support one channel (#0)
756 return -EINVAL;
757 memset(vch,0,sizeof(*vch));
758 strcpy(vch->name, "CCD-input");
759 vch->type = VIDEO_TYPE_CAMERA;
760 return 0;
761 }
762 case VIDIOCSCHAN:
763 {
764 struct video_channel *vch = arg;
765 if(vch->channel != 0)
766 return -EINVAL;
767 return 0;
768 }
769 case VIDIOCGTUNER:
770 {
771 struct video_tuner *vtune = arg;
772 if(vtune->tuner != 0)
773 return -EINVAL;
774 strcpy(vtune->name, "no tuner");
775 vtune->rangelow = 0;
776 vtune->rangehigh = 0;
777 vtune->flags = VIDEO_TUNER_NORM;
778 vtune->mode = VIDEO_MODE_AUTO;
779 vtune->signal = 0xffff;
780 return 0;
781 }
782 case VIDIOCSTUNER:
783 {
784 struct video_tuner *vtune = arg;
785 if (vtune->tuner != 0)
786 return -EINVAL;
787 if (vtune->mode != VIDEO_MODE_AUTO)
788 return -EINVAL;
789 return 0;
790 }
791 case VIDIOCGPICT:
792 {
793 struct video_picture vpic = {
794 cam->brightness << 8, // brightness
795 (cam->hue + 128) << 8, // hue
796 cam->color << 9, // color
797 cam->contrast << 9, // contrast
798 0x8000, // whiteness
799 16, VIDEO_PALETTE_YUV422// bpp, palette format
800 };
801 struct video_picture *pic = arg;
802 *pic = vpic;
803 return 0;
804 }
805 case VIDIOCSPICT:
806 {
807 struct video_picture *vpic = arg;
808 if (vpic->depth != 16 || (vpic->palette != VIDEO_PALETTE_YUV422 && vpic->palette != VIDEO_PALETTE_YUYV))
809 return -EINVAL;
810
811 cam->brightness = vpic->brightness >> 8;
812 cam->hue = (vpic->hue >> 8) - 128;
813 cam->color = vpic->colour >> 9;
814 cam->contrast = vpic->contrast >> 9;
815
816 w9966_pdev_claim(cam);
817
818 if (
819 w9966_wReg_i2c(cam, 0x0a, cam->brightness) == -1 ||
820 w9966_wReg_i2c(cam, 0x0b, cam->contrast) == -1 ||
821 w9966_wReg_i2c(cam, 0x0c, cam->color) == -1 ||
822 w9966_wReg_i2c(cam, 0x0d, cam->hue) == -1
823 ) {
824 w9966_pdev_release(cam);
825 return -EIO;
826 }
827
828 w9966_pdev_release(cam);
829 return 0;
830 }
831 case VIDIOCSWIN:
832 {
833 int ret;
834 struct video_window *vwin = arg;
835
836 if (vwin->flags != 0)
837 return -EINVAL;
838 if (vwin->clipcount != 0)
839 return -EINVAL;
840 if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W)
841 return -EINVAL;
842 if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H)
843 return -EINVAL;
844
845 // Update camera regs
846 w9966_pdev_claim(cam);
847 ret = w9966_setup(cam, 0, 0, 1023, 1023, vwin->width, vwin->height);
848 w9966_pdev_release(cam);
849
850 if (ret != 0) {
851 DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n");
852 return -EIO;
853 }
854
855 return 0;
856 }
857 case VIDIOCGWIN:
858 {
859 struct video_window *vwin = arg;
860 memset(vwin, 0, sizeof(*vwin));
861 vwin->width = cam->width;
862 vwin->height = cam->height;
863 return 0;
864 }
865 // Unimplemented
866 case VIDIOCCAPTURE:
867 case VIDIOCGFBUF:
868 case VIDIOCSFBUF:
869 case VIDIOCKEY:
870 case VIDIOCGFREQ:
871 case VIDIOCSFREQ:
872 case VIDIOCGAUDIO:
873 case VIDIOCSAUDIO:
874 return -EINVAL;
875 default:
876 return -ENOIOCTLCMD;
877 }
878 return 0;
879 }
880
881 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
882 unsigned int cmd, unsigned long arg)
883 {
884 return video_usercopy(inode, file, cmd, arg, w9966_v4l_do_ioctl);
885 }
886
887 // Capture data
888 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
889 size_t count, loff_t *ppos)
890 {
891 struct w9966_dev *cam = video_drvdata(file);
892 unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000
893 unsigned char __user *dest = (unsigned char __user *)buf;
894 unsigned long dleft = count;
895 unsigned char *tbuf;
896
897 // Why would anyone want more than this??
898 if (count > cam->width * cam->height * 2)
899 return -EINVAL;
900
901 w9966_pdev_claim(cam);
902 w9966_wReg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
903 w9966_wReg(cam, 0x00, 0x00); // Return to normal operation
904 w9966_wReg(cam, 0x01, 0x98); // Enable capture
905
906 // write special capture-addr and negotiate into data transfer
907 if (
908 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_ADDR) != 0 )||
909 (parport_write(cam->pport, &addr, 1) != 1 )||
910 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_DATA) != 0 )
911 ) {
912 w9966_pdev_release(cam);
913 return -EFAULT;
914 }
915
916 tbuf = kmalloc(W9966_RBUFFER, GFP_KERNEL);
917 if (tbuf == NULL) {
918 count = -ENOMEM;
919 goto out;
920 }
921
922 while(dleft > 0)
923 {
924 unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
925
926 if (parport_read(cam->pport, tbuf, tsize) < tsize) {
927 count = -EFAULT;
928 goto out;
929 }
930 if (copy_to_user(dest, tbuf, tsize) != 0) {
931 count = -EFAULT;
932 goto out;
933 }
934 dest += tsize;
935 dleft -= tsize;
936 }
937
938 w9966_wReg(cam, 0x01, 0x18); // Disable capture
939
940 out:
941 kfree(tbuf);
942 w9966_pdev_release(cam);
943
944 return count;
945 }
946
947
948 // Called once for every parport on init
949 static void w9966_attach(struct parport *port)
950 {
951 int i;
952
953 for (i = 0; i < W9966_MAXCAMS; i++)
954 {
955 if (w9966_cams[i].dev_state != 0) // Cam is already assigned
956 continue;
957 if (
958 strcmp(pardev[i], "aggressive") == 0 ||
959 strcmp(pardev[i], port->name) == 0
960 ) {
961 if (w9966_init(&w9966_cams[i], port) != 0)
962 w9966_term(&w9966_cams[i]);
963 break; // return
964 }
965 }
966 }
967
968 // Called once for every parport on termination
969 static void w9966_detach(struct parport *port)
970 {
971 int i;
972 for (i = 0; i < W9966_MAXCAMS; i++)
973 if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port)
974 w9966_term(&w9966_cams[i]);
975 }
976
977
978 static struct parport_driver w9966_ppd = {
979 .name = W9966_DRIVERNAME,
980 .attach = w9966_attach,
981 .detach = w9966_detach,
982 };
983
984 // Module entry point
985 static int __init w9966_mod_init(void)
986 {
987 int i;
988 for (i = 0; i < W9966_MAXCAMS; i++)
989 w9966_cams[i].dev_state = 0;
990
991 return parport_register_driver(&w9966_ppd);
992 }
993
994 // Module cleanup
995 static void __exit w9966_mod_term(void)
996 {
997 parport_unregister_driver(&w9966_ppd);
998 }
999
1000 module_init(w9966_mod_init);
1001 module_exit(w9966_mod_term);
Linux kernel - Deliverables
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