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[XFRM]: skb_cow_data() does not set proper owner for new skbs.
[linux-2.6/verdex.git] / drivers / media / video / w9966.c
blobc318ba32fbafa9ba88f31abf647b91dbef32ccb5
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/videodev.h>
61 #include <linux/parport.h>
62
63 //#define DEBUG // Undef me for production
64
65 #ifdef DEBUG
66 #define DPRINTF(x, a...) printk(KERN_DEBUG "W9966: %s(): "x, __FUNCTION__ , ##a)
67 #else
68 #define DPRINTF(x...)
69 #endif
70
71 /*
72 * Defines, simple typedefs etc.
73 */
74
75 #define W9966_DRIVERNAME "W9966CF Webcam"
76 #define W9966_MAXCAMS 4 // Maximum number of cameras
77 #define W9966_RBUFFER 2048 // Read buffer (must be an even number)
78 #define W9966_SRAMSIZE 131072 // 128kb
79 #define W9966_SRAMID 0x02 // check w9966cf.pdf
80
81 // Empirically determined window limits
82 #define W9966_WND_MIN_X 16
83 #define W9966_WND_MIN_Y 14
84 #define W9966_WND_MAX_X 705
85 #define W9966_WND_MAX_Y 253
86 #define W9966_WND_MAX_W (W9966_WND_MAX_X - W9966_WND_MIN_X)
87 #define W9966_WND_MAX_H (W9966_WND_MAX_Y - W9966_WND_MIN_Y)
88
89 // Keep track of our current state
90 #define W9966_STATE_PDEV 0x01
91 #define W9966_STATE_CLAIMED 0x02
92 #define W9966_STATE_VDEV 0x04
93
94 #define W9966_I2C_W_ID 0x48
95 #define W9966_I2C_R_ID 0x49
96 #define W9966_I2C_R_DATA 0x08
97 #define W9966_I2C_R_CLOCK 0x04
98 #define W9966_I2C_W_DATA 0x02
99 #define W9966_I2C_W_CLOCK 0x01
100
101 struct w9966_dev {
102 unsigned char dev_state;
103 unsigned char i2c_state;
104 unsigned short ppmode;
105 struct parport* pport;
106 struct pardevice* pdev;
107 struct video_device vdev;
108 unsigned short width;
109 unsigned short height;
110 unsigned char brightness;
111 signed char contrast;
112 signed char color;
113 signed char hue;
114 };
115
116 /*
117 * Module specific properties
118 */
119
120 MODULE_AUTHOR("Jakob Kemi <jakob.kemi@post.utfors.se>");
121 MODULE_DESCRIPTION("Winbond w9966cf WebCam driver (0.32)");
122 MODULE_LICENSE("GPL");
123
124
125 #ifdef MODULE
126 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = ""};
127 #else
128 static const char* pardev[] = {[0 ... W9966_MAXCAMS] = "aggressive"};
129 #endif
130 module_param_array(pardev, charp, NULL, 0);
131 MODULE_PARM_DESC(pardev, "pardev: where to search for\n\
132 \teach camera. 'aggressive' means brute-force search.\n\
133 \tEg: >pardev=parport3,aggressive,parport2,parport1< would assign\n\
134 \tcam 1 to parport3 and search every parport for cam 2 etc...");
135
136 static int parmode = 0;
137 module_param(parmode, int, 0);
138 MODULE_PARM_DESC(parmode, "parmode: transfer mode (0=auto, 1=ecp, 2=epp");
139
140 static int video_nr = -1;
141 module_param(video_nr, int, 0);
142
143 /*
144 * Private data
145 */
146
147 static struct w9966_dev w9966_cams[W9966_MAXCAMS];
148
149 /*
150 * Private function declares
151 */
152
153 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val);
154 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val);
155 static inline void w9966_pdev_claim(struct w9966_dev *vdev);
156 static inline void w9966_pdev_release(struct w9966_dev *vdev);
157
158 static int w9966_rReg(struct w9966_dev* cam, int reg);
159 static int w9966_wReg(struct w9966_dev* cam, int reg, int data);
160 #if 0
161 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg);
162 #endif
163 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data);
164 static int w9966_findlen(int near, int size, int maxlen);
165 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor);
166 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h);
167
168 static int w9966_init(struct w9966_dev* cam, struct parport* port);
169 static void w9966_term(struct w9966_dev* cam);
170
171 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state);
172 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state);
173 static inline int w9966_i2c_getsda(struct w9966_dev* cam);
174 static inline int w9966_i2c_getscl(struct w9966_dev* cam);
175 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data);
176 #if 0
177 static int w9966_i2c_rbyte(struct w9966_dev* cam);
178 #endif
179
180 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
181 unsigned int cmd, unsigned long arg);
182 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
183 size_t count, loff_t *ppos);
184
185 static struct file_operations w9966_fops = {
186 .owner = THIS_MODULE,
187 .open = video_exclusive_open,
188 .release = video_exclusive_release,
189 .ioctl = w9966_v4l_ioctl,
190 .read = w9966_v4l_read,
191 .llseek = no_llseek,
192 };
193 static struct video_device w9966_template = {
194 .owner = THIS_MODULE,
195 .name = W9966_DRIVERNAME,
196 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
197 .hardware = VID_HARDWARE_W9966,
198 .fops = &w9966_fops,
199 };
200
201 /*
202 * Private function defines
203 */
204
205
206 // Set camera phase flags, so we know what to uninit when terminating
207 static inline void w9966_setState(struct w9966_dev* cam, int mask, int val)
208 {
209 cam->dev_state = (cam->dev_state & ~mask) ^ val;
210 }
211
212 // Get camera phase flags
213 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val)
214 {
215 return ((cam->dev_state & mask) == val);
216 }
217
218 // Claim parport for ourself
219 static inline void w9966_pdev_claim(struct w9966_dev* cam)
220 {
221 if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED))
222 return;
223 parport_claim_or_block(cam->pdev);
224 w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED);
225 }
226
227 // Release parport for others to use
228 static inline void w9966_pdev_release(struct w9966_dev* cam)
229 {
230 if (w9966_getState(cam, W9966_STATE_CLAIMED, 0))
231 return;
232 parport_release(cam->pdev);
233 w9966_setState(cam, W9966_STATE_CLAIMED, 0);
234 }
235
236 // Read register from W9966 interface-chip
237 // Expects a claimed pdev
238 // -1 on error, else register data (byte)
239 static int w9966_rReg(struct w9966_dev* cam, int reg)
240 {
241 // ECP, read, regtransfer, REG, REG, REG, REG, REG
242 const unsigned char addr = 0x80 | (reg & 0x1f);
243 unsigned char val;
244
245 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
246 return -1;
247 if (parport_write(cam->pport, &addr, 1) != 1)
248 return -1;
249 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
250 return -1;
251 if (parport_read(cam->pport, &val, 1) != 1)
252 return -1;
253
254 return val;
255 }
256
257 // Write register to W9966 interface-chip
258 // Expects a claimed pdev
259 // -1 on error
260 static int w9966_wReg(struct w9966_dev* cam, int reg, int data)
261 {
262 // ECP, write, regtransfer, REG, REG, REG, REG, REG
263 const unsigned char addr = 0xc0 | (reg & 0x1f);
264 const unsigned char val = data;
265
266 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
267 return -1;
268 if (parport_write(cam->pport, &addr, 1) != 1)
269 return -1;
270 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
271 return -1;
272 if (parport_write(cam->pport, &val, 1) != 1)
273 return -1;
274
275 return 0;
276 }
277
278 // Initialize camera device. Setup all internal flags, set a
279 // default video mode, setup ccd-chip, register v4l device etc..
280 // Also used for 'probing' of hardware.
281 // -1 on error
282 static int w9966_init(struct w9966_dev* cam, struct parport* port)
283 {
284 if (cam->dev_state != 0)
285 return -1;
286
287 cam->pport = port;
288 cam->brightness = 128;
289 cam->contrast = 64;
290 cam->color = 64;
291 cam->hue = 0;
292
293 // Select requested transfer mode
294 switch(parmode)
295 {
296 default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
297 case 0:
298 if (port->modes & PARPORT_MODE_ECP)
299 cam->ppmode = IEEE1284_MODE_ECP;
300 else if (port->modes & PARPORT_MODE_EPP)
301 cam->ppmode = IEEE1284_MODE_EPP;
302 else
303 cam->ppmode = IEEE1284_MODE_ECP;
304 break;
305 case 1: // hw- or sw-ecp
306 cam->ppmode = IEEE1284_MODE_ECP;
307 break;
308 case 2: // hw- or sw-epp
309 cam->ppmode = IEEE1284_MODE_EPP;
310 break;
311 }
312
313 // Tell the parport driver that we exists
314 cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL);
315 if (cam->pdev == NULL) {
316 DPRINTF("parport_register_device() failed\n");
317 return -1;
318 }
319 w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV);
320
321 w9966_pdev_claim(cam);
322
323 // Setup a default capture mode
324 if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) {
325 DPRINTF("w9966_setup() failed.\n");
326 return -1;
327 }
328
329 w9966_pdev_release(cam);
330
331 // Fill in the video_device struct and register us to v4l
332 memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device));
333 cam->vdev.priv = cam;
334
335 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) == -1)
336 return -1;
337
338 w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV);
339
340 // All ok
341 printk(
342 "w9966cf: Found and initialized a webcam on %s.\n",
343 cam->pport->name
344 );
345 return 0;
346 }
347
348
349 // Terminate everything gracefully
350 static void w9966_term(struct w9966_dev* cam)
351 {
352 // Unregister from v4l
353 if (w9966_getState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) {
354 video_unregister_device(&cam->vdev);
355 w9966_setState(cam, W9966_STATE_VDEV, 0);
356 }
357
358 // Terminate from IEEE1284 mode and release pdev block
359 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
360 w9966_pdev_claim(cam);
361 parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
362 w9966_pdev_release(cam);
363 }
364
365 // Unregister from parport
366 if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) {
367 parport_unregister_device(cam->pdev);
368 w9966_setState(cam, W9966_STATE_PDEV, 0);
369 }
370 }
371
372
373 // Find a good length for capture window (used both for W and H)
374 // A bit ugly but pretty functional. The capture length
375 // have to match the downscale
376 static int w9966_findlen(int near, int size, int maxlen)
377 {
378 int bestlen = size;
379 int besterr = abs(near - bestlen);
380 int len;
381
382 for(len = size+1;len < maxlen;len++)
383 {
384 int err;
385 if ( ((64*size) %len) != 0)
386 continue;
387
388 err = abs(near - len);
389
390 // Only continue as long as we keep getting better values
391 if (err > besterr)
392 break;
393
394 besterr = err;
395 bestlen = len;
396 }
397
398 return bestlen;
399 }
400
401 // Modify capture window (if necessary)
402 // and calculate downscaling
403 // Return -1 on error
404 static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor)
405 {
406 int maxlen = max - min;
407 int len = *end - *beg + 1;
408 int newlen = w9966_findlen(len, size, maxlen);
409 int err = newlen - len;
410
411 // Check for bad format
412 if (newlen > maxlen || newlen < size)
413 return -1;
414
415 // Set factor (6 bit fixed)
416 *factor = (64*size) / newlen;
417 if (*factor == 64)
418 *factor = 0x00; // downscale is disabled
419 else
420 *factor |= 0x80; // set downscale-enable bit
421
422 // Modify old beginning and end
423 *beg -= err / 2;
424 *end += err - (err / 2);
425
426 // Move window if outside borders
427 if (*beg < min) {
428 *end += min - *beg;
429 *beg += min - *beg;
430 }
431 if (*end > max) {
432 *beg -= *end - max;
433 *end -= *end - max;
434 }
435
436 return 0;
437 }
438
439 // Setup the cameras capture window etc.
440 // Expects a claimed pdev
441 // return -1 on error
442 static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
443 {
444 unsigned int i;
445 unsigned int enh_s, enh_e;
446 unsigned char scale_x, scale_y;
447 unsigned char regs[0x1c];
448 unsigned char saa7111_regs[] = {
449 0x21, 0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00,
450 0x88, 0x10, 0x80, 0x40, 0x40, 0x00, 0x01, 0x00,
451 0x48, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
452 0x00, 0x00, 0x00, 0x71, 0xe7, 0x00, 0x00, 0xc0
453 };
454
455
456 if (w*h*2 > W9966_SRAMSIZE)
457 {
458 DPRINTF("capture window exceeds SRAM size!.\n");
459 w = 200; h = 160; // Pick default values
460 }
461
462 w &= ~0x1;
463 if (w < 2) w = 2;
464 if (h < 1) h = 1;
465 if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W;
466 if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H;
467
468 cam->width = w;
469 cam->height = h;
470
471 enh_s = 0;
472 enh_e = w*h*2;
473
474 // Modify capture window if necessary and calculate downscaling
475 if (
476 w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 ||
477 w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0
478 ) return -1;
479
480 DPRINTF(
481 "%dx%d, x: %d<->%d, y: %d<->%d, sx: %d/64, sy: %d/64.\n",
482 w, h, x1, x2, y1, y2, scale_x&~0x80, scale_y&~0x80
483 );
484
485 // Setup registers
486 regs[0x00] = 0x00; // Set normal operation
487 regs[0x01] = 0x18; // Capture mode
488 regs[0x02] = scale_y; // V-scaling
489 regs[0x03] = scale_x; // H-scaling
490
491 // Capture window
492 regs[0x04] = (x1 & 0x0ff); // X-start (8 low bits)
493 regs[0x05] = (x1 & 0x300)>>8; // X-start (2 high bits)
494 regs[0x06] = (y1 & 0x0ff); // Y-start (8 low bits)
495 regs[0x07] = (y1 & 0x300)>>8; // Y-start (2 high bits)
496 regs[0x08] = (x2 & 0x0ff); // X-end (8 low bits)
497 regs[0x09] = (x2 & 0x300)>>8; // X-end (2 high bits)
498 regs[0x0a] = (y2 & 0x0ff); // Y-end (8 low bits)
499
500 regs[0x0c] = W9966_SRAMID; // SRAM-banks (1x 128kb)
501
502 // Enhancement layer
503 regs[0x0d] = (enh_s& 0x000ff); // Enh. start (0-7)
504 regs[0x0e] = (enh_s& 0x0ff00)>>8; // Enh. start (8-15)
505 regs[0x0f] = (enh_s& 0x70000)>>16; // Enh. start (16-17/18??)
506 regs[0x10] = (enh_e& 0x000ff); // Enh. end (0-7)
507 regs[0x11] = (enh_e& 0x0ff00)>>8; // Enh. end (8-15)
508 regs[0x12] = (enh_e& 0x70000)>>16; // Enh. end (16-17/18??)
509
510 // Misc
511 regs[0x13] = 0x40; // VEE control (raw 4:2:2)
512 regs[0x17] = 0x00; // ???
513 regs[0x18] = cam->i2c_state = 0x00; // Serial bus
514 regs[0x19] = 0xff; // I/O port direction control
515 regs[0x1a] = 0xff; // I/O port data register
516 regs[0x1b] = 0x10; // ???
517
518 // SAA7111 chip settings
519 saa7111_regs[0x0a] = cam->brightness;
520 saa7111_regs[0x0b] = cam->contrast;
521 saa7111_regs[0x0c] = cam->color;
522 saa7111_regs[0x0d] = cam->hue;
523
524 // Reset (ECP-fifo & serial-bus)
525 if (w9966_wReg(cam, 0x00, 0x03) == -1)
526 return -1;
527
528 // Write regs to w9966cf chip
529 for (i = 0; i < 0x1c; i++)
530 if (w9966_wReg(cam, i, regs[i]) == -1)
531 return -1;
532
533 // Write regs to saa7111 chip
534 for (i = 0; i < 0x20; i++)
535 if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1)
536 return -1;
537
538 return 0;
539 }
540
541 /*
542 * Ugly and primitive i2c protocol functions
543 */
544
545 // Sets the data line on the i2c bus.
546 // Expects a claimed pdev.
547 static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state)
548 {
549 if (state)
550 cam->i2c_state |= W9966_I2C_W_DATA;
551 else
552 cam->i2c_state &= ~W9966_I2C_W_DATA;
553
554 w9966_wReg(cam, 0x18, cam->i2c_state);
555 udelay(5);
556 }
557
558 // Get peripheral clock line
559 // Expects a claimed pdev.
560 static inline int w9966_i2c_getscl(struct w9966_dev* cam)
561 {
562 const unsigned char state = w9966_rReg(cam, 0x18);
563 return ((state & W9966_I2C_R_CLOCK) > 0);
564 }
565
566 // Sets the clock line on the i2c bus.
567 // Expects a claimed pdev. -1 on error
568 static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
569 {
570 unsigned long timeout;
571
572 if (state)
573 cam->i2c_state |= W9966_I2C_W_CLOCK;
574 else
575 cam->i2c_state &= ~W9966_I2C_W_CLOCK;
576
577 w9966_wReg(cam, 0x18, cam->i2c_state);
578 udelay(5);
579
580 // we go to high, we also expect the peripheral to ack.
581 if (state) {
582 timeout = jiffies + 100;
583 while (!w9966_i2c_getscl(cam)) {
584 if (time_after(jiffies, timeout))
585 return -1;
586 }
587 }
588 return 0;
589 }
590
591 // Get peripheral data line
592 // Expects a claimed pdev.
593 static inline int w9966_i2c_getsda(struct w9966_dev* cam)
594 {
595 const unsigned char state = w9966_rReg(cam, 0x18);
596 return ((state & W9966_I2C_R_DATA) > 0);
597 }
598
599 // Write a byte with ack to the i2c bus.
600 // Expects a claimed pdev. -1 on error
601 static int w9966_i2c_wbyte(struct w9966_dev* cam, int data)
602 {
603 int i;
604 for (i = 7; i >= 0; i--)
605 {
606 w9966_i2c_setsda(cam, (data >> i) & 0x01);
607
608 if (w9966_i2c_setscl(cam, 1) == -1)
609 return -1;
610 w9966_i2c_setscl(cam, 0);
611 }
612
613 w9966_i2c_setsda(cam, 1);
614
615 if (w9966_i2c_setscl(cam, 1) == -1)
616 return -1;
617 w9966_i2c_setscl(cam, 0);
618
619 return 0;
620 }
621
622 // Read a data byte with ack from the i2c-bus
623 // Expects a claimed pdev. -1 on error
624 #if 0
625 static int w9966_i2c_rbyte(struct w9966_dev* cam)
626 {
627 unsigned char data = 0x00;
628 int i;
629
630 w9966_i2c_setsda(cam, 1);
631
632 for (i = 0; i < 8; i++)
633 {
634 if (w9966_i2c_setscl(cam, 1) == -1)
635 return -1;
636 data = data << 1;
637 if (w9966_i2c_getsda(cam))
638 data |= 0x01;
639
640 w9966_i2c_setscl(cam, 0);
641 }
642 return data;
643 }
644 #endif
645
646 // Read a register from the i2c device.
647 // Expects claimed pdev. -1 on error
648 #if 0
649 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg)
650 {
651 int data;
652
653 w9966_i2c_setsda(cam, 0);
654 w9966_i2c_setscl(cam, 0);
655
656 if (
657 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
658 w9966_i2c_wbyte(cam, reg) == -1
659 )
660 return -1;
661
662 w9966_i2c_setsda(cam, 1);
663 if (w9966_i2c_setscl(cam, 1) == -1)
664 return -1;
665 w9966_i2c_setsda(cam, 0);
666 w9966_i2c_setscl(cam, 0);
667
668 if (
669 w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 ||
670 (data = w9966_i2c_rbyte(cam)) == -1
671 )
672 return -1;
673
674 w9966_i2c_setsda(cam, 0);
675
676 if (w9966_i2c_setscl(cam, 1) == -1)
677 return -1;
678 w9966_i2c_setsda(cam, 1);
679
680 return data;
681 }
682 #endif
683
684 // Write a register to the i2c device.
685 // Expects claimed pdev. -1 on error
686 static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data)
687 {
688 w9966_i2c_setsda(cam, 0);
689 w9966_i2c_setscl(cam, 0);
690
691 if (
692 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
693 w9966_i2c_wbyte(cam, reg) == -1 ||
694 w9966_i2c_wbyte(cam, data) == -1
695 )
696 return -1;
697
698 w9966_i2c_setsda(cam, 0);
699 if (w9966_i2c_setscl(cam, 1) == -1)
700 return -1;
701
702 w9966_i2c_setsda(cam, 1);
703
704 return 0;
705 }
706
707 /*
708 * Video4linux interfacing
709 */
710
711 static int w9966_v4l_do_ioctl(struct inode *inode, struct file *file,
712 unsigned int cmd, void *arg)
713 {
714 struct video_device *vdev = video_devdata(file);
715 struct w9966_dev *cam = vdev->priv;
716
717 switch(cmd)
718 {
719 case VIDIOCGCAP:
720 {
721 static struct video_capability vcap = {
722 .name = W9966_DRIVERNAME,
723 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
724 .channels = 1,
725 .maxwidth = W9966_WND_MAX_W,
726 .maxheight = W9966_WND_MAX_H,
727 .minwidth = 2,
728 .minheight = 1,
729 };
730 struct video_capability *cap = arg;
731 *cap = vcap;
732 return 0;
733 }
734 case VIDIOCGCHAN:
735 {
736 struct video_channel *vch = arg;
737 if(vch->channel != 0) // We only support one channel (#0)
738 return -EINVAL;
739 memset(vch,0,sizeof(*vch));
740 strcpy(vch->name, "CCD-input");
741 vch->type = VIDEO_TYPE_CAMERA;
742 return 0;
743 }
744 case VIDIOCSCHAN:
745 {
746 struct video_channel *vch = arg;
747 if(vch->channel != 0)
748 return -EINVAL;
749 return 0;
750 }
751 case VIDIOCGTUNER:
752 {
753 struct video_tuner *vtune = arg;
754 if(vtune->tuner != 0)
755 return -EINVAL;
756 strcpy(vtune->name, "no tuner");
757 vtune->rangelow = 0;
758 vtune->rangehigh = 0;
759 vtune->flags = VIDEO_TUNER_NORM;
760 vtune->mode = VIDEO_MODE_AUTO;
761 vtune->signal = 0xffff;
762 return 0;
763 }
764 case VIDIOCSTUNER:
765 {
766 struct video_tuner *vtune = arg;
767 if (vtune->tuner != 0)
768 return -EINVAL;
769 if (vtune->mode != VIDEO_MODE_AUTO)
770 return -EINVAL;
771 return 0;
772 }
773 case VIDIOCGPICT:
774 {
775 struct video_picture vpic = {
776 cam->brightness << 8, // brightness
777 (cam->hue + 128) << 8, // hue
778 cam->color << 9, // color
779 cam->contrast << 9, // contrast
780 0x8000, // whiteness
781 16, VIDEO_PALETTE_YUV422// bpp, palette format
782 };
783 struct video_picture *pic = arg;
784 *pic = vpic;
785 return 0;
786 }
787 case VIDIOCSPICT:
788 {
789 struct video_picture *vpic = arg;
790 if (vpic->depth != 16 || vpic->palette != VIDEO_PALETTE_YUV422)
791 return -EINVAL;
792
793 cam->brightness = vpic->brightness >> 8;
794 cam->hue = (vpic->hue >> 8) - 128;
795 cam->color = vpic->colour >> 9;
796 cam->contrast = vpic->contrast >> 9;
797
798 w9966_pdev_claim(cam);
799
800 if (
801 w9966_wReg_i2c(cam, 0x0a, cam->brightness) == -1 ||
802 w9966_wReg_i2c(cam, 0x0b, cam->contrast) == -1 ||
803 w9966_wReg_i2c(cam, 0x0c, cam->color) == -1 ||
804 w9966_wReg_i2c(cam, 0x0d, cam->hue) == -1
805 ) {
806 w9966_pdev_release(cam);
807 return -EIO;
808 }
809
810 w9966_pdev_release(cam);
811 return 0;
812 }
813 case VIDIOCSWIN:
814 {
815 int ret;
816 struct video_window *vwin = arg;
817
818 if (vwin->flags != 0)
819 return -EINVAL;
820 if (vwin->clipcount != 0)
821 return -EINVAL;
822 if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W)
823 return -EINVAL;
824 if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H)
825 return -EINVAL;
826
827 // Update camera regs
828 w9966_pdev_claim(cam);
829 ret = w9966_setup(cam, 0, 0, 1023, 1023, vwin->width, vwin->height);
830 w9966_pdev_release(cam);
831
832 if (ret != 0) {
833 DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n");
834 return -EIO;
835 }
836
837 return 0;
838 }
839 case VIDIOCGWIN:
840 {
841 struct video_window *vwin = arg;
842 memset(vwin, 0, sizeof(*vwin));
843 vwin->width = cam->width;
844 vwin->height = cam->height;
845 return 0;
846 }
847 // Unimplemented
848 case VIDIOCCAPTURE:
849 case VIDIOCGFBUF:
850 case VIDIOCSFBUF:
851 case VIDIOCKEY:
852 case VIDIOCGFREQ:
853 case VIDIOCSFREQ:
854 case VIDIOCGAUDIO:
855 case VIDIOCSAUDIO:
856 return -EINVAL;
857 default:
858 return -ENOIOCTLCMD;
859 }
860 return 0;
861 }
862
863 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
864 unsigned int cmd, unsigned long arg)
865 {
866 return video_usercopy(inode, file, cmd, arg, w9966_v4l_do_ioctl);
867 }
868
869 // Capture data
870 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
871 size_t count, loff_t *ppos)
872 {
873 struct video_device *vdev = video_devdata(file);
874 struct w9966_dev *cam = vdev->priv;
875 unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000
876 unsigned char __user *dest = (unsigned char __user *)buf;
877 unsigned long dleft = count;
878 unsigned char *tbuf;
879
880 // Why would anyone want more than this??
881 if (count > cam->width * cam->height * 2)
882 return -EINVAL;
883
884 w9966_pdev_claim(cam);
885 w9966_wReg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
886 w9966_wReg(cam, 0x00, 0x00); // Return to normal operation
887 w9966_wReg(cam, 0x01, 0x98); // Enable capture
888
889 // write special capture-addr and negotiate into data transfer
890 if (
891 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_ADDR) != 0 )||
892 (parport_write(cam->pport, &addr, 1) != 1 )||
893 (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_DATA) != 0 )
894 ) {
895 w9966_pdev_release(cam);
896 return -EFAULT;
897 }
898
899 tbuf = kmalloc(W9966_RBUFFER, GFP_KERNEL);
900 if (tbuf == NULL) {
901 count = -ENOMEM;
902 goto out;
903 }
904
905 while(dleft > 0)
906 {
907 unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
908
909 if (parport_read(cam->pport, tbuf, tsize) < tsize) {
910 count = -EFAULT;
911 goto out;
912 }
913 if (copy_to_user(dest, tbuf, tsize) != 0) {
914 count = -EFAULT;
915 goto out;
916 }
917 dest += tsize;
918 dleft -= tsize;
919 }
920
921 w9966_wReg(cam, 0x01, 0x18); // Disable capture
922
923 out:
924 kfree(tbuf);
925 w9966_pdev_release(cam);
926
927 return count;
928 }
929
930
931 // Called once for every parport on init
932 static void w9966_attach(struct parport *port)
933 {
934 int i;
935
936 for (i = 0; i < W9966_MAXCAMS; i++)
937 {
938 if (w9966_cams[i].dev_state != 0) // Cam is already assigned
939 continue;
940 if (
941 strcmp(pardev[i], "aggressive") == 0 ||
942 strcmp(pardev[i], port->name) == 0
943 ) {
944 if (w9966_init(&w9966_cams[i], port) != 0)
945 w9966_term(&w9966_cams[i]);
946 break; // return
947 }
948 }
949 }
950
951 // Called once for every parport on termination
952 static void w9966_detach(struct parport *port)
953 {
954 int i;
955 for (i = 0; i < W9966_MAXCAMS; i++)
956 if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port)
957 w9966_term(&w9966_cams[i]);
958 }
959
960
961 static struct parport_driver w9966_ppd = {
962 .name = W9966_DRIVERNAME,
963 .attach = w9966_attach,
964 .detach = w9966_detach,
965 };
966
967 // Module entry point
968 static int __init w9966_mod_init(void)
969 {
970 int i;
971 for (i = 0; i < W9966_MAXCAMS; i++)
972 w9966_cams[i].dev_state = 0;
973
974 return parport_register_driver(&w9966_ppd);
975 }
976
977 // Module cleanup
978 static void __exit w9966_mod_term(void)
979 {
980 parport_unregister_driver(&w9966_ppd);
981 }
982
983 module_init(w9966_mod_init);
984 module_exit(w9966_mod_term);
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