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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / media / video / w9966.c
blobdcade619cbd8454db5ba93166064eba0ccf39c35
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 <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 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);
187
188 static int w9966_exclusive_open(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 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 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,
209 };
210 static struct video_device w9966_template = {
211 .name = W9966_DRIVERNAME,
212 .fops = &w9966_fops,
213 .release = video_device_release_empty,
214 };
215
216 /*
217 * Private function defines
218 */
219
220
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)
223 {
224 cam->dev_state = (cam->dev_state & ~mask) ^ val;
225 }
226
227 // Get camera phase flags
228 static inline int w9966_getState(struct w9966_dev* cam, int mask, int val)
229 {
230 return ((cam->dev_state & mask) == val);
231 }
232
233 // Claim parport for ourself
234 static inline void w9966_pdev_claim(struct w9966_dev* cam)
235 {
236 if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED))
237 return;
238 parport_claim_or_block(cam->pdev);
239 w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED);
240 }
241
242 // Release parport for others to use
243 static inline void w9966_pdev_release(struct w9966_dev* cam)
244 {
245 if (w9966_getState(cam, W9966_STATE_CLAIMED, 0))
246 return;
247 parport_release(cam->pdev);
248 w9966_setState(cam, W9966_STATE_CLAIMED, 0);
249 }
250
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)
255 {
256 // ECP, read, regtransfer, REG, REG, REG, REG, REG
257 const unsigned char addr = 0x80 | (reg & 0x1f);
258 unsigned char val;
259
260 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
261 return -1;
262 if (parport_write(cam->pport, &addr, 1) != 1)
263 return -1;
264 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
265 return -1;
266 if (parport_read(cam->pport, &val, 1) != 1)
267 return -1;
268
269 return val;
270 }
271
272 // Write register to W9966 interface-chip
273 // Expects a claimed pdev
274 // -1 on error
275 static int w9966_wReg(struct w9966_dev* cam, int reg, int data)
276 {
277 // ECP, write, regtransfer, REG, REG, REG, REG, REG
278 const unsigned char addr = 0xc0 | (reg & 0x1f);
279 const unsigned char val = data;
280
281 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0)
282 return -1;
283 if (parport_write(cam->pport, &addr, 1) != 1)
284 return -1;
285 if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0)
286 return -1;
287 if (parport_write(cam->pport, &val, 1) != 1)
288 return -1;
289
290 return 0;
291 }
292
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.
296 // -1 on error
297 static int w9966_init(struct w9966_dev* cam, struct parport* port)
298 {
299 if (cam->dev_state != 0)
300 return -1;
301
302 cam->pport = port;
303 cam->brightness = 128;
304 cam->contrast = 64;
305 cam->color = 64;
306 cam->hue = 0;
307
308 // Select requested transfer mode
309 switch(parmode)
310 {
311 default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
312 case 0:
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;
317 else
318 cam->ppmode = IEEE1284_MODE_ECP;
319 break;
320 case 1: // hw- or sw-ecp
321 cam->ppmode = IEEE1284_MODE_ECP;
322 break;
323 case 2: // hw- or sw-epp
324 cam->ppmode = IEEE1284_MODE_EPP;
325 break;
326 }
327
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");
332 return -1;
333 }
334 w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV);
335
336 w9966_pdev_claim(cam);
337
338 // Setup a default capture mode
339 if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) {
340 DPRINTF("w9966_setup() failed.\n");
341 return -1;
342 }
343
344 w9966_pdev_release(cam);
345
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);
349
350 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0)
351 return -1;
352
353 w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV);
354
355 // All ok
356 printk(
357 "w9966cf: Found and initialized a webcam on %s.\n",
358 cam->pport->name
359 );
360 return 0;
361 }
362
363
364 // Terminate everything gracefully
365 static void w9966_term(struct w9966_dev* cam)
366 {
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);
371 }
372
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);
378 }
379
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);
384 }
385 }
386
387
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)
392 {
393 int bestlen = size;
394 int besterr = abs(near - bestlen);
395 int len;
396
397 for(len = size+1;len < maxlen;len++)
398 {
399 int err;
400 if ( ((64*size) %len) != 0)
401 continue;
402
403 err = abs(near - len);
404
405 // Only continue as long as we keep getting better values
406 if (err > besterr)
407 break;
408
409 besterr = err;
410 bestlen = len;
411 }
412
413 return bestlen;
414 }
415
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)
420 {
421 int maxlen = max - min;
422 int len = *end - *beg + 1;
423 int newlen = w9966_findlen(len, size, maxlen);
424 int err = newlen - len;
425
426 // Check for bad format
427 if (newlen > maxlen || newlen < size)
428 return -1;
429
430 // Set factor (6 bit fixed)
431 *factor = (64*size) / newlen;
432 if (*factor == 64)
433 *factor = 0x00; // downscale is disabled
434 else
435 *factor |= 0x80; // set downscale-enable bit
436
437 // Modify old beginning and end
438 *beg -= err / 2;
439 *end += err - (err / 2);
440
441 // Move window if outside borders
442 if (*beg < min) {
443 *end += min - *beg;
444 *beg += min - *beg;
445 }
446 if (*end > max) {
447 *beg -= *end - max;
448 *end -= *end - max;
449 }
450
451 return 0;
452 }
453
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)
458 {
459 unsigned int i;
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
468 };
469
470
471 if (w*h*2 > W9966_SRAMSIZE)
472 {
473 DPRINTF("capture window exceeds SRAM size!.\n");
474 w = 200; h = 160; // Pick default values
475 }
476
477 w &= ~0x1;
478 if (w < 2) w = 2;
479 if (h < 1) h = 1;
480 if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W;
481 if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H;
482
483 cam->width = w;
484 cam->height = h;
485
486 enh_s = 0;
487 enh_e = w*h*2;
488
489 // Modify capture window if necessary and calculate downscaling
490 if (
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
493 ) return -1;
494
495 DPRINTF(
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
498 );
499
500 // Setup registers
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
505
506 // Capture window
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)
514
515 regs[0x0c] = W9966_SRAMID; // SRAM-banks (1x 128kb)
516
517 // Enhancement layer
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??)
524
525 // Misc
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; // ???
532
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;
538
539 // Reset (ECP-fifo & serial-bus)
540 if (w9966_wReg(cam, 0x00, 0x03) == -1)
541 return -1;
542
543 // Write regs to w9966cf chip
544 for (i = 0; i < 0x1c; i++)
545 if (w9966_wReg(cam, i, regs[i]) == -1)
546 return -1;
547
548 // Write regs to saa7111 chip
549 for (i = 0; i < 0x20; i++)
550 if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1)
551 return -1;
552
553 return 0;
554 }
555
556 /*
557 * Ugly and primitive i2c protocol functions
558 */
559
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)
563 {
564 if (state)
565 cam->i2c_state |= W9966_I2C_W_DATA;
566 else
567 cam->i2c_state &= ~W9966_I2C_W_DATA;
568
569 w9966_wReg(cam, 0x18, cam->i2c_state);
570 udelay(5);
571 }
572
573 // Get peripheral clock line
574 // Expects a claimed pdev.
575 static inline int w9966_i2c_getscl(struct w9966_dev* cam)
576 {
577 const unsigned char state = w9966_rReg(cam, 0x18);
578 return ((state & W9966_I2C_R_CLOCK) > 0);
579 }
580
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)
584 {
585 unsigned long timeout;
586
587 if (state)
588 cam->i2c_state |= W9966_I2C_W_CLOCK;
589 else
590 cam->i2c_state &= ~W9966_I2C_W_CLOCK;
591
592 w9966_wReg(cam, 0x18, cam->i2c_state);
593 udelay(5);
594
595 // we go to high, we also expect the peripheral to ack.
596 if (state) {
597 timeout = jiffies + 100;
598 while (!w9966_i2c_getscl(cam)) {
599 if (time_after(jiffies, timeout))
600 return -1;
601 }
602 }
603 return 0;
604 }
605
606 // Get peripheral data line
607 // Expects a claimed pdev.
608 static inline int w9966_i2c_getsda(struct w9966_dev* cam)
609 {
610 const unsigned char state = w9966_rReg(cam, 0x18);
611 return ((state & W9966_I2C_R_DATA) > 0);
612 }
613
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)
617 {
618 int i;
619 for (i = 7; i >= 0; i--)
620 {
621 w9966_i2c_setsda(cam, (data >> i) & 0x01);
622
623 if (w9966_i2c_setscl(cam, 1) == -1)
624 return -1;
625 w9966_i2c_setscl(cam, 0);
626 }
627
628 w9966_i2c_setsda(cam, 1);
629
630 if (w9966_i2c_setscl(cam, 1) == -1)
631 return -1;
632 w9966_i2c_setscl(cam, 0);
633
634 return 0;
635 }
636
637 // Read a data byte with ack from the i2c-bus
638 // Expects a claimed pdev. -1 on error
639 #if 0
640 static int w9966_i2c_rbyte(struct w9966_dev* cam)
641 {
642 unsigned char data = 0x00;
643 int i;
644
645 w9966_i2c_setsda(cam, 1);
646
647 for (i = 0; i < 8; i++)
648 {
649 if (w9966_i2c_setscl(cam, 1) == -1)
650 return -1;
651 data = data << 1;
652 if (w9966_i2c_getsda(cam))
653 data |= 0x01;
654
655 w9966_i2c_setscl(cam, 0);
656 }
657 return data;
658 }
659 #endif
660
661 // Read a register from the i2c device.
662 // Expects claimed pdev. -1 on error
663 #if 0
664 static int w9966_rReg_i2c(struct w9966_dev* cam, int reg)
665 {
666 int data;
667
668 w9966_i2c_setsda(cam, 0);
669 w9966_i2c_setscl(cam, 0);
670
671 if (
672 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
673 w9966_i2c_wbyte(cam, reg) == -1
674 )
675 return -1;
676
677 w9966_i2c_setsda(cam, 1);
678 if (w9966_i2c_setscl(cam, 1) == -1)
679 return -1;
680 w9966_i2c_setsda(cam, 0);
681 w9966_i2c_setscl(cam, 0);
682
683 if (
684 w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 ||
685 (data = w9966_i2c_rbyte(cam)) == -1
686 )
687 return -1;
688
689 w9966_i2c_setsda(cam, 0);
690
691 if (w9966_i2c_setscl(cam, 1) == -1)
692 return -1;
693 w9966_i2c_setsda(cam, 1);
694
695 return data;
696 }
697 #endif
698
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)
702 {
703 w9966_i2c_setsda(cam, 0);
704 w9966_i2c_setscl(cam, 0);
705
706 if (
707 w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 ||
708 w9966_i2c_wbyte(cam, reg) == -1 ||
709 w9966_i2c_wbyte(cam, data) == -1
710 )
711 return -1;
712
713 w9966_i2c_setsda(cam, 0);
714 if (w9966_i2c_setscl(cam, 1) == -1)
715 return -1;
716
717 w9966_i2c_setsda(cam, 1);
718
719 return 0;
720 }
721
722 /*
723 * Video4linux interfacing
724 */
725
726 static long w9966_v4l_do_ioctl(struct file *file, unsigned int cmd, void *arg)
727 {
728 struct w9966_dev *cam = video_drvdata(file);
729
730 switch(cmd)
731 {
732 case VIDIOCGCAP:
733 {
734 static struct video_capability vcap = {
735 .name = W9966_DRIVERNAME,
736 .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
737 .channels = 1,
738 .maxwidth = W9966_WND_MAX_W,
739 .maxheight = W9966_WND_MAX_H,
740 .minwidth = 2,
741 .minheight = 1,
742 };
743 struct video_capability *cap = arg;
744 *cap = vcap;
745 return 0;
746 }
747 case VIDIOCGCHAN:
748 {
749 struct video_channel *vch = arg;
750 if(vch->channel != 0) // We only support one channel (#0)
751 return -EINVAL;
752 memset(vch,0,sizeof(*vch));
753 strcpy(vch->name, "CCD-input");
754 vch->type = VIDEO_TYPE_CAMERA;
755 return 0;
756 }
757 case VIDIOCSCHAN:
758 {
759 struct video_channel *vch = arg;
760 if(vch->channel != 0)
761 return -EINVAL;
762 return 0;
763 }
764 case VIDIOCGTUNER:
765 {
766 struct video_tuner *vtune = arg;
767 if(vtune->tuner != 0)
768 return -EINVAL;
769 strcpy(vtune->name, "no tuner");
770 vtune->rangelow = 0;
771 vtune->rangehigh = 0;
772 vtune->flags = VIDEO_TUNER_NORM;
773 vtune->mode = VIDEO_MODE_AUTO;
774 vtune->signal = 0xffff;
775 return 0;
776 }
777 case VIDIOCSTUNER:
778 {
779 struct video_tuner *vtune = arg;
780 if (vtune->tuner != 0)
781 return -EINVAL;
782 if (vtune->mode != VIDEO_MODE_AUTO)
783 return -EINVAL;
784 return 0;
785 }
786 case VIDIOCGPICT:
787 {
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
793 0x8000, // whiteness
794 16, VIDEO_PALETTE_YUV422// bpp, palette format
795 };
796 struct video_picture *pic = arg;
797 *pic = vpic;
798 return 0;
799 }
800 case VIDIOCSPICT:
801 {
802 struct video_picture *vpic = arg;
803 if (vpic->depth != 16 || (vpic->palette != VIDEO_PALETTE_YUV422 && vpic->palette != VIDEO_PALETTE_YUYV))
804 return -EINVAL;
805
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;
810
811 w9966_pdev_claim(cam);
812
813 if (
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
818 ) {
819 w9966_pdev_release(cam);
820 return -EIO;
821 }
822
823 w9966_pdev_release(cam);
824 return 0;
825 }
826 case VIDIOCSWIN:
827 {
828 int ret;
829 struct video_window *vwin = arg;
830
831 if (vwin->flags != 0)
832 return -EINVAL;
833 if (vwin->clipcount != 0)
834 return -EINVAL;
835 if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W)
836 return -EINVAL;
837 if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H)
838 return -EINVAL;
839
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);
844
845 if (ret != 0) {
846 DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n");
847 return -EIO;
848 }
849
850 return 0;
851 }
852 case VIDIOCGWIN:
853 {
854 struct video_window *vwin = arg;
855 memset(vwin, 0, sizeof(*vwin));
856 vwin->width = cam->width;
857 vwin->height = cam->height;
858 return 0;
859 }
860 // Unimplemented
861 case VIDIOCCAPTURE:
862 case VIDIOCGFBUF:
863 case VIDIOCSFBUF:
864 case VIDIOCKEY:
865 case VIDIOCGFREQ:
866 case VIDIOCSFREQ:
867 case VIDIOCGAUDIO:
868 case VIDIOCSAUDIO:
869 return -EINVAL;
870 default:
871 return -ENOIOCTLCMD;
872 }
873 return 0;
874 }
875
876 static long w9966_v4l_ioctl(struct file *file,
877 unsigned int cmd, unsigned long arg)
878 {
879 return video_usercopy(file, cmd, arg, w9966_v4l_do_ioctl);
880 }
881
882 // Capture data
883 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
884 size_t count, loff_t *ppos)
885 {
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;
890 unsigned char *tbuf;
891
892 // Why would anyone want more than this??
893 if (count > cam->width * cam->height * 2)
894 return -EINVAL;
895
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
900
901 // write special capture-addr and negotiate into data transfer
902 if (
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 )
906 ) {
907 w9966_pdev_release(cam);
908 return -EFAULT;
909 }
910
911 tbuf = kmalloc(W9966_RBUFFER, GFP_KERNEL);
912 if (tbuf == NULL) {
913 count = -ENOMEM;
914 goto out;
915 }
916
917 while(dleft > 0)
918 {
919 unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
920
921 if (parport_read(cam->pport, tbuf, tsize) < tsize) {
922 count = -EFAULT;
923 goto out;
924 }
925 if (copy_to_user(dest, tbuf, tsize) != 0) {
926 count = -EFAULT;
927 goto out;
928 }
929 dest += tsize;
930 dleft -= tsize;
931 }
932
933 w9966_wReg(cam, 0x01, 0x18); // Disable capture
934
935 out:
936 kfree(tbuf);
937 w9966_pdev_release(cam);
938
939 return count;
940 }
941
942
943 // Called once for every parport on init
944 static void w9966_attach(struct parport *port)
945 {
946 int i;
947
948 for (i = 0; i < W9966_MAXCAMS; i++)
949 {
950 if (w9966_cams[i].dev_state != 0) // Cam is already assigned
951 continue;
952 if (
953 strcmp(pardev[i], "aggressive") == 0 ||
954 strcmp(pardev[i], port->name) == 0
955 ) {
956 if (w9966_init(&w9966_cams[i], port) != 0)
957 w9966_term(&w9966_cams[i]);
958 break; // return
959 }
960 }
961 }
962
963 // Called once for every parport on termination
964 static void w9966_detach(struct parport *port)
965 {
966 int i;
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]);
970 }
971
972
973 static struct parport_driver w9966_ppd = {
974 .name = W9966_DRIVERNAME,
975 .attach = w9966_attach,
976 .detach = w9966_detach,
977 };
978
979 // Module entry point
980 static int __init w9966_mod_init(void)
981 {
982 int i;
983 for (i = 0; i < W9966_MAXCAMS; i++)
984 w9966_cams[i].dev_state = 0;
985
986 return parport_register_driver(&w9966_ppd);
987 }
988
989 // Module cleanup
990 static void __exit w9966_mod_term(void)
991 {
992 parport_unregister_driver(&w9966_ppd);
993 }
994
995 module_init(w9966_mod_init);
996 module_exit(w9966_mod_term);