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13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/videodev.h>
18#include <media/v4l2-common.h>
19#include <media/v4l2-chip-ident.h>
20#include <linux/i2c.h>
21
22
23MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
24MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
25MODULE_LICENSE("GPL");
26
27
28
29
30
31#define VGA_WIDTH 640
32#define VGA_HEIGHT 480
33#define QVGA_WIDTH 320
34#define QVGA_HEIGHT 240
35#define CIF_WIDTH 352
36#define CIF_HEIGHT 288
37#define QCIF_WIDTH 176
38#define QCIF_HEIGHT 144
39
40
41
42
43#define OV7670_FRAME_RATE 30
44
45
46
47
48#define OV7670_I2C_ADDR 0x42
49
50
51#define REG_GAIN 0x00
52#define REG_BLUE 0x01
53#define REG_RED 0x02
54#define REG_VREF 0x03
55#define REG_COM1 0x04
56#define COM1_CCIR656 0x40
57#define REG_BAVE 0x05
58#define REG_GbAVE 0x06
59#define REG_AECHH 0x07
60#define REG_RAVE 0x08
61#define REG_COM2 0x09
62#define COM2_SSLEEP 0x10
63#define REG_PID 0x0a
64#define REG_VER 0x0b
65#define REG_COM3 0x0c
66#define COM3_SWAP 0x40
67#define COM3_SCALEEN 0x08
68#define COM3_DCWEN 0x04
69#define REG_COM4 0x0d
70#define REG_COM5 0x0e
71#define REG_COM6 0x0f
72#define REG_AECH 0x10
73#define REG_CLKRC 0x11
74#define CLK_EXT 0x40
75#define CLK_SCALE 0x3f
76#define REG_COM7 0x12
77#define COM7_RESET 0x80
78#define COM7_FMT_MASK 0x38
79#define COM7_FMT_VGA 0x00
80#define COM7_FMT_CIF 0x20
81#define COM7_FMT_QVGA 0x10
82#define COM7_FMT_QCIF 0x08
83#define COM7_RGB 0x04
84#define COM7_YUV 0x00
85#define COM7_BAYER 0x01
86#define COM7_PBAYER 0x05
87#define REG_COM8 0x13
88#define COM8_FASTAEC 0x80
89#define COM8_AECSTEP 0x40
90#define COM8_BFILT 0x20
91#define COM8_AGC 0x04
92#define COM8_AWB 0x02
93#define COM8_AEC 0x01
94#define REG_COM9 0x14
95#define REG_COM10 0x15
96#define COM10_HSYNC 0x40
97#define COM10_PCLK_HB 0x20
98#define COM10_HREF_REV 0x08
99#define COM10_VS_LEAD 0x04
100#define COM10_VS_NEG 0x02
101#define COM10_HS_NEG 0x01
102#define REG_HSTART 0x17
103#define REG_HSTOP 0x18
104#define REG_VSTART 0x19
105#define REG_VSTOP 0x1a
106#define REG_PSHFT 0x1b
107#define REG_MIDH 0x1c
108#define REG_MIDL 0x1d
109#define REG_MVFP 0x1e
110#define MVFP_MIRROR 0x20
111#define MVFP_FLIP 0x10
112
113#define REG_AEW 0x24
114#define REG_AEB 0x25
115#define REG_VPT 0x26
116#define REG_HSYST 0x30
117#define REG_HSYEN 0x31
118#define REG_HREF 0x32
119#define REG_TSLB 0x3a
120#define TSLB_YLAST 0x04
121#define REG_COM11 0x3b
122#define COM11_NIGHT 0x80
123#define COM11_NMFR 0x60
124#define COM11_HZAUTO 0x10
125#define COM11_50HZ 0x08
126#define COM11_EXP 0x02
127#define REG_COM12 0x3c
128#define COM12_HREF 0x80
129#define REG_COM13 0x3d
130#define COM13_GAMMA 0x80
131#define COM13_UVSAT 0x40
132#define COM13_UVSWAP 0x01
133#define REG_COM14 0x3e
134#define COM14_DCWEN 0x10
135#define REG_EDGE 0x3f
136#define REG_COM15 0x40
137#define COM15_R10F0 0x00
138#define COM15_R01FE 0x80
139#define COM15_R00FF 0xc0
140#define COM15_RGB565 0x10
141#define COM15_RGB555 0x30
142#define REG_COM16 0x41
143#define COM16_AWBGAIN 0x08
144#define REG_COM17 0x42
145#define COM17_AECWIN 0xc0
146#define COM17_CBAR 0x08
147
148
149
150
151
152
153
154
155
156
157#define REG_CMATRIX_BASE 0x4f
158#define CMATRIX_LEN 6
159#define REG_CMATRIX_SIGN 0x58
160
161
162#define REG_BRIGHT 0x55
163#define REG_CONTRAS 0x56
164
165#define REG_GFIX 0x69
166
167#define REG_REG76 0x76
168#define R76_BLKPCOR 0x80
169#define R76_WHTPCOR 0x40
170
171#define REG_RGB444 0x8c
172#define R444_ENABLE 0x02
173#define R444_RGBX 0x01
174
175#define REG_HAECC1 0x9f
176#define REG_HAECC2 0xa0
177
178#define REG_BD50MAX 0xa5
179#define REG_HAECC3 0xa6
180#define REG_HAECC4 0xa7
181#define REG_HAECC5 0xa8
182#define REG_HAECC6 0xa9
183#define REG_HAECC7 0xaa
184#define REG_BD60MAX 0xab
185
186
187
188
189
190struct ov7670_format_struct;
191struct ov7670_info {
192 struct ov7670_format_struct *fmt;
193 unsigned char sat;
194 int hue;
195};
196
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206
207
208struct regval_list {
209 unsigned char reg_num;
210 unsigned char value;
211};
212
213static struct regval_list ov7670_default_regs[] = {
214 { REG_COM7, COM7_RESET },
215
216
217
218
219
220 { REG_CLKRC, 0x1 },
221 { REG_TSLB, 0x04 },
222 { REG_COM7, 0 },
223
224
225
226
227 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
228 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
229 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },
230
231 { REG_COM3, 0 }, { REG_COM14, 0 },
232
233 { 0x70, 0x3a }, { 0x71, 0x35 },
234 { 0x72, 0x11 }, { 0x73, 0xf0 },
235 { 0xa2, 0x02 }, { REG_COM10, 0x0 },
236
237
238 { 0x7a, 0x20 }, { 0x7b, 0x10 },
239 { 0x7c, 0x1e }, { 0x7d, 0x35 },
240 { 0x7e, 0x5a }, { 0x7f, 0x69 },
241 { 0x80, 0x76 }, { 0x81, 0x80 },
242 { 0x82, 0x88 }, { 0x83, 0x8f },
243 { 0x84, 0x96 }, { 0x85, 0xa3 },
244 { 0x86, 0xaf }, { 0x87, 0xc4 },
245 { 0x88, 0xd7 }, { 0x89, 0xe8 },
246
247
248
249 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
250 { REG_GAIN, 0 }, { REG_AECH, 0 },
251 { REG_COM4, 0x40 },
252 { REG_COM9, 0x18 },
253 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
254 { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
255 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
256 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 },
257 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
258 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
259 { REG_HAECC7, 0x94 },
260 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
261
262
263 { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
264 { 0x16, 0x02 }, { REG_MVFP, 0x07 },
265 { 0x21, 0x02 }, { 0x22, 0x91 },
266 { 0x29, 0x07 }, { 0x33, 0x0b },
267 { 0x35, 0x0b }, { 0x37, 0x1d },
268 { 0x38, 0x71 }, { 0x39, 0x2a },
269 { REG_COM12, 0x78 }, { 0x4d, 0x40 },
270 { 0x4e, 0x20 }, { REG_GFIX, 0 },
271 { 0x6b, 0x4a }, { 0x74, 0x10 },
272 { 0x8d, 0x4f }, { 0x8e, 0 },
273 { 0x8f, 0 }, { 0x90, 0 },
274 { 0x91, 0 }, { 0x96, 0 },
275 { 0x9a, 0 }, { 0xb0, 0x84 },
276 { 0xb1, 0x0c }, { 0xb2, 0x0e },
277 { 0xb3, 0x82 }, { 0xb8, 0x0a },
278
279
280 { 0x43, 0x0a }, { 0x44, 0xf0 },
281 { 0x45, 0x34 }, { 0x46, 0x58 },
282 { 0x47, 0x28 }, { 0x48, 0x3a },
283 { 0x59, 0x88 }, { 0x5a, 0x88 },
284 { 0x5b, 0x44 }, { 0x5c, 0x67 },
285 { 0x5d, 0x49 }, { 0x5e, 0x0e },
286 { 0x6c, 0x0a }, { 0x6d, 0x55 },
287 { 0x6e, 0x11 }, { 0x6f, 0x9f },
288 { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
289 { REG_RED, 0x60 },
290 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
291
292
293 { 0x4f, 0x80 }, { 0x50, 0x80 },
294 { 0x51, 0 }, { 0x52, 0x22 },
295 { 0x53, 0x5e }, { 0x54, 0x80 },
296 { 0x58, 0x9e },
297
298 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
299 { 0x75, 0x05 }, { 0x76, 0xe1 },
300 { 0x4c, 0 }, { 0x77, 0x01 },
301 { REG_COM13, 0xc3 }, { 0x4b, 0x09 },
302 { 0xc9, 0x60 }, { REG_COM16, 0x38 },
303 { 0x56, 0x40 },
304
305 { 0x34, 0x11 }, { REG_COM11, COM11_EXP|COM11_HZAUTO },
306 { 0xa4, 0x88 }, { 0x96, 0 },
307 { 0x97, 0x30 }, { 0x98, 0x20 },
308 { 0x99, 0x30 }, { 0x9a, 0x84 },
309 { 0x9b, 0x29 }, { 0x9c, 0x03 },
310 { 0x9d, 0x4c }, { 0x9e, 0x3f },
311 { 0x78, 0x04 },
312
313
314 { 0x79, 0x01 }, { 0xc8, 0xf0 },
315 { 0x79, 0x0f }, { 0xc8, 0x00 },
316 { 0x79, 0x10 }, { 0xc8, 0x7e },
317 { 0x79, 0x0a }, { 0xc8, 0x80 },
318 { 0x79, 0x0b }, { 0xc8, 0x01 },
319 { 0x79, 0x0c }, { 0xc8, 0x0f },
320 { 0x79, 0x0d }, { 0xc8, 0x20 },
321 { 0x79, 0x09 }, { 0xc8, 0x80 },
322 { 0x79, 0x02 }, { 0xc8, 0xc0 },
323 { 0x79, 0x03 }, { 0xc8, 0x40 },
324 { 0x79, 0x05 }, { 0xc8, 0x30 },
325 { 0x79, 0x26 },
326
327 { 0xff, 0xff },
328};
329
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332
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335
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337
338
339
340
341static struct regval_list ov7670_fmt_yuv422[] = {
342 { REG_COM7, 0x0 },
343 { REG_RGB444, 0 },
344 { REG_COM1, 0 },
345 { REG_COM15, COM15_R00FF },
346 { REG_COM9, 0x18 },
347 { 0x4f, 0x80 },
348 { 0x50, 0x80 },
349 { 0x51, 0 },
350 { 0x52, 0x22 },
351 { 0x53, 0x5e },
352 { 0x54, 0x80 },
353 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
354 { 0xff, 0xff },
355};
356
357static struct regval_list ov7670_fmt_rgb565[] = {
358 { REG_COM7, COM7_RGB },
359 { REG_RGB444, 0 },
360 { REG_COM1, 0x0 },
361 { REG_COM15, COM15_RGB565 },
362 { REG_COM9, 0x38 },
363 { 0x4f, 0xb3 },
364 { 0x50, 0xb3 },
365 { 0x51, 0 },
366 { 0x52, 0x3d },
367 { 0x53, 0xa7 },
368 { 0x54, 0xe4 },
369 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
370 { 0xff, 0xff },
371};
372
373static struct regval_list ov7670_fmt_rgb444[] = {
374 { REG_COM7, COM7_RGB },
375 { REG_RGB444, R444_ENABLE },
376 { REG_COM1, 0x40 },
377 { REG_COM15, COM15_R01FE|COM15_RGB565 },
378 { REG_COM9, 0x38 },
379 { 0x4f, 0xb3 },
380 { 0x50, 0xb3 },
381 { 0x51, 0 },
382 { 0x52, 0x3d },
383 { 0x53, 0xa7 },
384 { 0x54, 0xe4 },
385 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 },
386 { 0xff, 0xff },
387};
388
389static struct regval_list ov7670_fmt_raw[] = {
390 { REG_COM7, COM7_BAYER },
391 { REG_COM13, 0x08 },
392 { REG_COM16, 0x3d },
393 { REG_REG76, 0xe1 },
394 { 0xff, 0xff },
395};
396
397
398
399
400
401
402
403static int ov7670_read(struct i2c_client *c, unsigned char reg,
404 unsigned char *value)
405{
406 int ret;
407
408 ret = i2c_smbus_read_byte_data(c, reg);
409 if (ret >= 0)
410 *value = (unsigned char) ret;
411 return ret;
412}
413
414
415static int ov7670_write(struct i2c_client *c, unsigned char reg,
416 unsigned char value)
417{
418 int ret = i2c_smbus_write_byte_data(c, reg, value);
419 if (reg == REG_COM7 && (value & COM7_RESET))
420 msleep(2);
421 return ret;
422}
423
424
425
426
427
428static int ov7670_write_array(struct i2c_client *c, struct regval_list *vals)
429{
430 while (vals->reg_num != 0xff || vals->value != 0xff) {
431 int ret = ov7670_write(c, vals->reg_num, vals->value);
432 if (ret < 0)
433 return ret;
434 vals++;
435 }
436 return 0;
437}
438
439
440
441
442
443static void ov7670_reset(struct i2c_client *client)
444{
445 ov7670_write(client, REG_COM7, COM7_RESET);
446 msleep(1);
447}
448
449
450static int ov7670_init(struct i2c_client *client)
451{
452 return ov7670_write_array(client, ov7670_default_regs);
453}
454
455
456
457static int ov7670_detect(struct i2c_client *client)
458{
459 unsigned char v;
460 int ret;
461
462 ret = ov7670_init(client);
463 if (ret < 0)
464 return ret;
465 ret = ov7670_read(client, REG_MIDH, &v);
466 if (ret < 0)
467 return ret;
468 if (v != 0x7f)
469 return -ENODEV;
470 ret = ov7670_read(client, REG_MIDL, &v);
471 if (ret < 0)
472 return ret;
473 if (v != 0xa2)
474 return -ENODEV;
475
476
477
478 ret = ov7670_read(client, REG_PID, &v);
479 if (ret < 0)
480 return ret;
481 if (v != 0x76)
482 return -ENODEV;
483 ret = ov7670_read(client, REG_VER, &v);
484 if (ret < 0)
485 return ret;
486 if (v != 0x73)
487 return -ENODEV;
488 return 0;
489}
490
491
492
493
494
495
496
497static struct ov7670_format_struct {
498 __u8 *desc;
499 __u32 pixelformat;
500 struct regval_list *regs;
501 int cmatrix[CMATRIX_LEN];
502 int bpp;
503} ov7670_formats[] = {
504 {
505 .desc = "YUYV 4:2:2",
506 .pixelformat = V4L2_PIX_FMT_YUYV,
507 .regs = ov7670_fmt_yuv422,
508 .cmatrix = { 128, -128, 0, -34, -94, 128 },
509 .bpp = 2,
510 },
511 {
512 .desc = "RGB 444",
513 .pixelformat = V4L2_PIX_FMT_RGB444,
514 .regs = ov7670_fmt_rgb444,
515 .cmatrix = { 179, -179, 0, -61, -176, 228 },
516 .bpp = 2,
517 },
518 {
519 .desc = "RGB 565",
520 .pixelformat = V4L2_PIX_FMT_RGB565,
521 .regs = ov7670_fmt_rgb565,
522 .cmatrix = { 179, -179, 0, -61, -176, 228 },
523 .bpp = 2,
524 },
525 {
526 .desc = "Raw RGB Bayer",
527 .pixelformat = V4L2_PIX_FMT_SBGGR8,
528 .regs = ov7670_fmt_raw,
529 .cmatrix = { 0, 0, 0, 0, 0, 0 },
530 .bpp = 1
531 },
532};
533#define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats)
534
535
536
537
538
539
540
541
542
543
544
545
546static struct regval_list ov7670_qcif_regs[] = {
547 { REG_COM3, COM3_SCALEEN|COM3_DCWEN },
548 { REG_COM3, COM3_DCWEN },
549 { REG_COM14, COM14_DCWEN | 0x01},
550 { 0x73, 0xf1 },
551 { 0xa2, 0x52 },
552 { 0x7b, 0x1c },
553 { 0x7c, 0x28 },
554 { 0x7d, 0x3c },
555 { 0x7f, 0x69 },
556 { REG_COM9, 0x38 },
557 { 0xa1, 0x0b },
558 { 0x74, 0x19 },
559 { 0x9a, 0x80 },
560 { 0x43, 0x14 },
561 { REG_COM13, 0xc0 },
562 { 0xff, 0xff },
563};
564
565static struct ov7670_win_size {
566 int width;
567 int height;
568 unsigned char com7_bit;
569 int hstart;
570 int hstop;
571 int vstart;
572 int vstop;
573 struct regval_list *regs;
574
575} ov7670_win_sizes[] = {
576
577 {
578 .width = VGA_WIDTH,
579 .height = VGA_HEIGHT,
580 .com7_bit = COM7_FMT_VGA,
581 .hstart = 158,
582 .hstop = 14,
583 .vstart = 10,
584 .vstop = 490,
585 .regs = NULL,
586 },
587
588 {
589 .width = CIF_WIDTH,
590 .height = CIF_HEIGHT,
591 .com7_bit = COM7_FMT_CIF,
592 .hstart = 170,
593 .hstop = 90,
594 .vstart = 14,
595 .vstop = 494,
596 .regs = NULL,
597 },
598
599 {
600 .width = QVGA_WIDTH,
601 .height = QVGA_HEIGHT,
602 .com7_bit = COM7_FMT_QVGA,
603 .hstart = 164,
604 .hstop = 20,
605 .vstart = 14,
606 .vstop = 494,
607 .regs = NULL,
608 },
609
610 {
611 .width = QCIF_WIDTH,
612 .height = QCIF_HEIGHT,
613 .com7_bit = COM7_FMT_VGA,
614 .hstart = 456,
615 .hstop = 24,
616 .vstart = 14,
617 .vstop = 494,
618 .regs = ov7670_qcif_regs,
619 },
620};
621
622#define N_WIN_SIZES (ARRAY_SIZE(ov7670_win_sizes))
623
624
625
626
627
628static int ov7670_set_hw(struct i2c_client *client, int hstart, int hstop,
629 int vstart, int vstop)
630{
631 int ret;
632 unsigned char v;
633
634
635
636
637
638 ret = ov7670_write(client, REG_HSTART, (hstart >> 3) & 0xff);
639 ret += ov7670_write(client, REG_HSTOP, (hstop >> 3) & 0xff);
640 ret += ov7670_read(client, REG_HREF, &v);
641 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
642 msleep(10);
643 ret += ov7670_write(client, REG_HREF, v);
644
645
646
647 ret += ov7670_write(client, REG_VSTART, (vstart >> 2) & 0xff);
648 ret += ov7670_write(client, REG_VSTOP, (vstop >> 2) & 0xff);
649 ret += ov7670_read(client, REG_VREF, &v);
650 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
651 msleep(10);
652 ret += ov7670_write(client, REG_VREF, v);
653 return ret;
654}
655
656
657static int ov7670_enum_fmt(struct i2c_client *c, struct v4l2_fmtdesc *fmt)
658{
659 struct ov7670_format_struct *ofmt;
660
661 if (fmt->index >= N_OV7670_FMTS)
662 return -EINVAL;
663
664 ofmt = ov7670_formats + fmt->index;
665 fmt->flags = 0;
666 strcpy(fmt->description, ofmt->desc);
667 fmt->pixelformat = ofmt->pixelformat;
668 return 0;
669}
670
671
672static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt,
673 struct ov7670_format_struct **ret_fmt,
674 struct ov7670_win_size **ret_wsize)
675{
676 int index;
677 struct ov7670_win_size *wsize;
678 struct v4l2_pix_format *pix = &fmt->fmt.pix;
679
680 for (index = 0; index < N_OV7670_FMTS; index++)
681 if (ov7670_formats[index].pixelformat == pix->pixelformat)
682 break;
683 if (index >= N_OV7670_FMTS)
684 return -EINVAL;
685 if (ret_fmt != NULL)
686 *ret_fmt = ov7670_formats + index;
687
688
689
690 if (pix->field == V4L2_FIELD_ANY)
691 pix->field = V4L2_FIELD_NONE;
692 else if (pix->field != V4L2_FIELD_NONE)
693 return -EINVAL;
694
695
696
697
698 for (wsize = ov7670_win_sizes; wsize < ov7670_win_sizes + N_WIN_SIZES;
699 wsize++)
700 if (pix->width >= wsize->width && pix->height >= wsize->height)
701 break;
702 if (wsize >= ov7670_win_sizes + N_WIN_SIZES)
703 wsize--;
704 if (ret_wsize != NULL)
705 *ret_wsize = wsize;
706
707
708
709 pix->width = wsize->width;
710 pix->height = wsize->height;
711 pix->bytesperline = pix->width*ov7670_formats[index].bpp;
712 pix->sizeimage = pix->height*pix->bytesperline;
713 return 0;
714}
715
716
717
718
719static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt)
720{
721 int ret;
722 struct ov7670_format_struct *ovfmt;
723 struct ov7670_win_size *wsize;
724 struct ov7670_info *info = i2c_get_clientdata(c);
725 unsigned char com7, clkrc;
726
727 ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize);
728 if (ret)
729 return ret;
730
731
732
733
734
735 if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565) {
736 ret = ov7670_read(c, REG_CLKRC, &clkrc);
737 if (ret)
738 return ret;
739 }
740
741
742
743
744
745
746 com7 = ovfmt->regs[0].value;
747 com7 |= wsize->com7_bit;
748 ov7670_write(c, REG_COM7, com7);
749
750
751
752 ov7670_write_array(c, ovfmt->regs + 1);
753 ov7670_set_hw(c, wsize->hstart, wsize->hstop, wsize->vstart,
754 wsize->vstop);
755 ret = 0;
756 if (wsize->regs)
757 ret = ov7670_write_array(c, wsize->regs);
758 info->fmt = ovfmt;
759
760 if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565 && ret == 0)
761 ret = ov7670_write(c, REG_CLKRC, clkrc);
762 return ret;
763}
764
765
766
767
768
769static int ov7670_g_parm(struct i2c_client *c, struct v4l2_streamparm *parms)
770{
771 struct v4l2_captureparm *cp = &parms->parm.capture;
772 unsigned char clkrc;
773 int ret;
774
775 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
776 return -EINVAL;
777 ret = ov7670_read(c, REG_CLKRC, &clkrc);
778 if (ret < 0)
779 return ret;
780 memset(cp, 0, sizeof(struct v4l2_captureparm));
781 cp->capability = V4L2_CAP_TIMEPERFRAME;
782 cp->timeperframe.numerator = 1;
783 cp->timeperframe.denominator = OV7670_FRAME_RATE;
784 if ((clkrc & CLK_EXT) == 0 && (clkrc & CLK_SCALE) > 1)
785 cp->timeperframe.denominator /= (clkrc & CLK_SCALE);
786 return 0;
787}
788
789static int ov7670_s_parm(struct i2c_client *c, struct v4l2_streamparm *parms)
790{
791 struct v4l2_captureparm *cp = &parms->parm.capture;
792 struct v4l2_fract *tpf = &cp->timeperframe;
793 unsigned char clkrc;
794 int ret, div;
795
796 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
797 return -EINVAL;
798 if (cp->extendedmode != 0)
799 return -EINVAL;
800
801
802
803 ret = ov7670_read(c, REG_CLKRC, &clkrc);
804 if (ret < 0)
805 return ret;
806 if (tpf->numerator == 0 || tpf->denominator == 0)
807 div = 1;
808 else
809 div = (tpf->numerator*OV7670_FRAME_RATE)/tpf->denominator;
810 if (div == 0)
811 div = 1;
812 else if (div > CLK_SCALE)
813 div = CLK_SCALE;
814 clkrc = (clkrc & 0x80) | div;
815 tpf->numerator = 1;
816 tpf->denominator = OV7670_FRAME_RATE/div;
817 return ov7670_write(c, REG_CLKRC, clkrc);
818}
819
820
821
822
823
824
825
826
827
828
829
830static int ov7670_store_cmatrix(struct i2c_client *client,
831 int matrix[CMATRIX_LEN])
832{
833 int i, ret;
834 unsigned char signbits;
835
836
837
838
839
840 ret = ov7670_read(client, REG_CMATRIX_SIGN, &signbits);
841 signbits &= 0xc0;
842
843 for (i = 0; i < CMATRIX_LEN; i++) {
844 unsigned char raw;
845
846 if (matrix[i] < 0) {
847 signbits |= (1 << i);
848 if (matrix[i] < -255)
849 raw = 0xff;
850 else
851 raw = (-1 * matrix[i]) & 0xff;
852 }
853 else {
854 if (matrix[i] > 255)
855 raw = 0xff;
856 else
857 raw = matrix[i] & 0xff;
858 }
859 ret += ov7670_write(client, REG_CMATRIX_BASE + i, raw);
860 }
861 ret += ov7670_write(client, REG_CMATRIX_SIGN, signbits);
862 return ret;
863}
864
865
866
867
868
869
870
871
872
873
874
875#define SIN_STEP 5
876static const int ov7670_sin_table[] = {
877 0, 87, 173, 258, 342, 422,
878 499, 573, 642, 707, 766, 819,
879 866, 906, 939, 965, 984, 996,
880 1000
881};
882
883static int ov7670_sine(int theta)
884{
885 int chs = 1;
886 int sine;
887
888 if (theta < 0) {
889 theta = -theta;
890 chs = -1;
891 }
892 if (theta <= 90)
893 sine = ov7670_sin_table[theta/SIN_STEP];
894 else {
895 theta -= 90;
896 sine = 1000 - ov7670_sin_table[theta/SIN_STEP];
897 }
898 return sine*chs;
899}
900
901static int ov7670_cosine(int theta)
902{
903 theta = 90 - theta;
904 if (theta > 180)
905 theta -= 360;
906 else if (theta < -180)
907 theta += 360;
908 return ov7670_sine(theta);
909}
910
911
912
913
914static void ov7670_calc_cmatrix(struct ov7670_info *info,
915 int matrix[CMATRIX_LEN])
916{
917 int i;
918
919
920
921 for (i = 0; i < CMATRIX_LEN; i++)
922 matrix[i] = (info->fmt->cmatrix[i]*info->sat) >> 7;
923
924
925
926 if (info->hue != 0) {
927 int sinth, costh, tmpmatrix[CMATRIX_LEN];
928
929 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
930 sinth = ov7670_sine(info->hue);
931 costh = ov7670_cosine(info->hue);
932
933 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000;
934 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000;
935 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000;
936 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000;
937 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000;
938 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000;
939 }
940}
941
942
943
944static int ov7670_t_sat(struct i2c_client *client, int value)
945{
946 struct ov7670_info *info = i2c_get_clientdata(client);
947 int matrix[CMATRIX_LEN];
948 int ret;
949
950 info->sat = value;
951 ov7670_calc_cmatrix(info, matrix);
952 ret = ov7670_store_cmatrix(client, matrix);
953 return ret;
954}
955
956static int ov7670_q_sat(struct i2c_client *client, __s32 *value)
957{
958 struct ov7670_info *info = i2c_get_clientdata(client);
959
960 *value = info->sat;
961 return 0;
962}
963
964static int ov7670_t_hue(struct i2c_client *client, int value)
965{
966 struct ov7670_info *info = i2c_get_clientdata(client);
967 int matrix[CMATRIX_LEN];
968 int ret;
969
970 if (value < -180 || value > 180)
971 return -EINVAL;
972 info->hue = value;
973 ov7670_calc_cmatrix(info, matrix);
974 ret = ov7670_store_cmatrix(client, matrix);
975 return ret;
976}
977
978
979static int ov7670_q_hue(struct i2c_client *client, __s32 *value)
980{
981 struct ov7670_info *info = i2c_get_clientdata(client);
982
983 *value = info->hue;
984 return 0;
985}
986
987
988
989
990
991static unsigned char ov7670_sm_to_abs(unsigned char v)
992{
993 if ((v & 0x80) == 0)
994 return v + 128;
995 else
996 return 128 - (v & 0x7f);
997}
998
999
1000static unsigned char ov7670_abs_to_sm(unsigned char v)
1001{
1002 if (v > 127)
1003 return v & 0x7f;
1004 else
1005 return (128 - v) | 0x80;
1006}
1007
1008static int ov7670_t_brightness(struct i2c_client *client, int value)
1009{
1010 unsigned char com8, v;
1011 int ret;
1012
1013 ov7670_read(client, REG_COM8, &com8);
1014 com8 &= ~COM8_AEC;
1015 ov7670_write(client, REG_COM8, com8);
1016 v = ov7670_abs_to_sm(value);
1017 ret = ov7670_write(client, REG_BRIGHT, v);
1018 return ret;
1019}
1020
1021static int ov7670_q_brightness(struct i2c_client *client, __s32 *value)
1022{
1023 unsigned char v;
1024 int ret = ov7670_read(client, REG_BRIGHT, &v);
1025
1026 *value = ov7670_sm_to_abs(v);
1027 return ret;
1028}
1029
1030static int ov7670_t_contrast(struct i2c_client *client, int value)
1031{
1032 return ov7670_write(client, REG_CONTRAS, (unsigned char) value);
1033}
1034
1035static int ov7670_q_contrast(struct i2c_client *client, __s32 *value)
1036{
1037 unsigned char v;
1038 int ret = ov7670_read(client, REG_CONTRAS, &v);
1039
1040 *value = v;
1041 return ret;
1042}
1043
1044static int ov7670_q_hflip(struct i2c_client *client, __s32 *value)
1045{
1046 int ret;
1047 unsigned char v;
1048
1049 ret = ov7670_read(client, REG_MVFP, &v);
1050 *value = (v & MVFP_MIRROR) == MVFP_MIRROR;
1051 return ret;
1052}
1053
1054
1055static int ov7670_t_hflip(struct i2c_client *client, int value)
1056{
1057 unsigned char v;
1058 int ret;
1059
1060 ret = ov7670_read(client, REG_MVFP, &v);
1061 if (value)
1062 v |= MVFP_MIRROR;
1063 else
1064 v &= ~MVFP_MIRROR;
1065 msleep(10);
1066 ret += ov7670_write(client, REG_MVFP, v);
1067 return ret;
1068}
1069
1070
1071
1072static int ov7670_q_vflip(struct i2c_client *client, __s32 *value)
1073{
1074 int ret;
1075 unsigned char v;
1076
1077 ret = ov7670_read(client, REG_MVFP, &v);
1078 *value = (v & MVFP_FLIP) == MVFP_FLIP;
1079 return ret;
1080}
1081
1082
1083static int ov7670_t_vflip(struct i2c_client *client, int value)
1084{
1085 unsigned char v;
1086 int ret;
1087
1088 ret = ov7670_read(client, REG_MVFP, &v);
1089 if (value)
1090 v |= MVFP_FLIP;
1091 else
1092 v &= ~MVFP_FLIP;
1093 msleep(10);
1094 ret += ov7670_write(client, REG_MVFP, v);
1095 return ret;
1096}
1097
1098
1099static struct ov7670_control {
1100 struct v4l2_queryctrl qc;
1101 int (*query)(struct i2c_client *c, __s32 *value);
1102 int (*tweak)(struct i2c_client *c, int value);
1103} ov7670_controls[] =
1104{
1105 {
1106 .qc = {
1107 .id = V4L2_CID_BRIGHTNESS,
1108 .type = V4L2_CTRL_TYPE_INTEGER,
1109 .name = "Brightness",
1110 .minimum = 0,
1111 .maximum = 255,
1112 .step = 1,
1113 .default_value = 0x80,
1114 .flags = V4L2_CTRL_FLAG_SLIDER
1115 },
1116 .tweak = ov7670_t_brightness,
1117 .query = ov7670_q_brightness,
1118 },
1119 {
1120 .qc = {
1121 .id = V4L2_CID_CONTRAST,
1122 .type = V4L2_CTRL_TYPE_INTEGER,
1123 .name = "Contrast",
1124 .minimum = 0,
1125 .maximum = 127,
1126 .step = 1,
1127 .default_value = 0x40,
1128 .flags = V4L2_CTRL_FLAG_SLIDER
1129 },
1130 .tweak = ov7670_t_contrast,
1131 .query = ov7670_q_contrast,
1132 },
1133 {
1134 .qc = {
1135 .id = V4L2_CID_SATURATION,
1136 .type = V4L2_CTRL_TYPE_INTEGER,
1137 .name = "Saturation",
1138 .minimum = 0,
1139 .maximum = 256,
1140 .step = 1,
1141 .default_value = 0x80,
1142 .flags = V4L2_CTRL_FLAG_SLIDER
1143 },
1144 .tweak = ov7670_t_sat,
1145 .query = ov7670_q_sat,
1146 },
1147 {
1148 .qc = {
1149 .id = V4L2_CID_HUE,
1150 .type = V4L2_CTRL_TYPE_INTEGER,
1151 .name = "HUE",
1152 .minimum = -180,
1153 .maximum = 180,
1154 .step = 5,
1155 .default_value = 0,
1156 .flags = V4L2_CTRL_FLAG_SLIDER
1157 },
1158 .tweak = ov7670_t_hue,
1159 .query = ov7670_q_hue,
1160 },
1161 {
1162 .qc = {
1163 .id = V4L2_CID_VFLIP,
1164 .type = V4L2_CTRL_TYPE_BOOLEAN,
1165 .name = "Vertical flip",
1166 .minimum = 0,
1167 .maximum = 1,
1168 .step = 1,
1169 .default_value = 0,
1170 },
1171 .tweak = ov7670_t_vflip,
1172 .query = ov7670_q_vflip,
1173 },
1174 {
1175 .qc = {
1176 .id = V4L2_CID_HFLIP,
1177 .type = V4L2_CTRL_TYPE_BOOLEAN,
1178 .name = "Horizontal mirror",
1179 .minimum = 0,
1180 .maximum = 1,
1181 .step = 1,
1182 .default_value = 0,
1183 },
1184 .tweak = ov7670_t_hflip,
1185 .query = ov7670_q_hflip,
1186 },
1187};
1188#define N_CONTROLS (ARRAY_SIZE(ov7670_controls))
1189
1190static struct ov7670_control *ov7670_find_control(__u32 id)
1191{
1192 int i;
1193
1194 for (i = 0; i < N_CONTROLS; i++)
1195 if (ov7670_controls[i].qc.id == id)
1196 return ov7670_controls + i;
1197 return NULL;
1198}
1199
1200
1201static int ov7670_queryctrl(struct i2c_client *client,
1202 struct v4l2_queryctrl *qc)
1203{
1204 struct ov7670_control *ctrl = ov7670_find_control(qc->id);
1205
1206 if (ctrl == NULL)
1207 return -EINVAL;
1208 *qc = ctrl->qc;
1209 return 0;
1210}
1211
1212static int ov7670_g_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1213{
1214 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
1215 int ret;
1216
1217 if (octrl == NULL)
1218 return -EINVAL;
1219 ret = octrl->query(client, &ctrl->value);
1220 if (ret >= 0)
1221 return 0;
1222 return ret;
1223}
1224
1225static int ov7670_s_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1226{
1227 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
1228 int ret;
1229
1230 if (octrl == NULL)
1231 return -EINVAL;
1232 ret = octrl->tweak(client, ctrl->value);
1233 if (ret >= 0)
1234 return 0;
1235 return ret;
1236}
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246static struct i2c_driver ov7670_driver;
1247
1248static int ov7670_attach(struct i2c_adapter *adapter)
1249{
1250 int ret;
1251 struct i2c_client *client;
1252 struct ov7670_info *info;
1253
1254
1255
1256
1257 if (adapter->id != I2C_HW_SMBUS_CAFE)
1258 return -ENODEV;
1259
1260 client = kzalloc(sizeof (struct i2c_client), GFP_KERNEL);
1261 if (! client)
1262 return -ENOMEM;
1263 client->adapter = adapter;
1264 client->addr = OV7670_I2C_ADDR;
1265 client->driver = &ov7670_driver,
1266 strcpy(client->name, "OV7670");
1267
1268
1269
1270 info = kzalloc(sizeof (struct ov7670_info), GFP_KERNEL);
1271 if (! info) {
1272 ret = -ENOMEM;
1273 goto out_free;
1274 }
1275 info->fmt = &ov7670_formats[0];
1276 info->sat = 128;
1277 i2c_set_clientdata(client, info);
1278
1279
1280
1281
1282 ret = ov7670_detect(client);
1283 if (ret)
1284 goto out_free_info;
1285 ret = i2c_attach_client(client);
1286 if (ret)
1287 goto out_free_info;
1288 return 0;
1289
1290 out_free_info:
1291 kfree(info);
1292 out_free:
1293 kfree(client);
1294 return ret;
1295}
1296
1297
1298static int ov7670_detach(struct i2c_client *client)
1299{
1300 i2c_detach_client(client);
1301 kfree(i2c_get_clientdata(client));
1302 kfree(client);
1303 return 0;
1304}
1305
1306
1307static int ov7670_command(struct i2c_client *client, unsigned int cmd,
1308 void *arg)
1309{
1310 switch (cmd) {
1311 case VIDIOC_G_CHIP_IDENT:
1312 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_OV7670, 0);
1313
1314 case VIDIOC_INT_RESET:
1315 ov7670_reset(client);
1316 return 0;
1317
1318 case VIDIOC_INT_INIT:
1319 return ov7670_init(client);
1320
1321 case VIDIOC_ENUM_FMT:
1322 return ov7670_enum_fmt(client, (struct v4l2_fmtdesc *) arg);
1323 case VIDIOC_TRY_FMT:
1324 return ov7670_try_fmt(client, (struct v4l2_format *) arg, NULL, NULL);
1325 case VIDIOC_S_FMT:
1326 return ov7670_s_fmt(client, (struct v4l2_format *) arg);
1327 case VIDIOC_QUERYCTRL:
1328 return ov7670_queryctrl(client, (struct v4l2_queryctrl *) arg);
1329 case VIDIOC_S_CTRL:
1330 return ov7670_s_ctrl(client, (struct v4l2_control *) arg);
1331 case VIDIOC_G_CTRL:
1332 return ov7670_g_ctrl(client, (struct v4l2_control *) arg);
1333 case VIDIOC_S_PARM:
1334 return ov7670_s_parm(client, (struct v4l2_streamparm *) arg);
1335 case VIDIOC_G_PARM:
1336 return ov7670_g_parm(client, (struct v4l2_streamparm *) arg);
1337 }
1338 return -EINVAL;
1339}
1340
1341
1342
1343static struct i2c_driver ov7670_driver = {
1344 .driver = {
1345 .name = "ov7670",
1346 },
1347 .id = I2C_DRIVERID_OV7670,
1348 .class = I2C_CLASS_CAM_DIGITAL,
1349 .attach_adapter = ov7670_attach,
1350 .detach_client = ov7670_detach,
1351 .command = ov7670_command,
1352};
1353
1354
1355
1356
1357
1358static int __init ov7670_mod_init(void)
1359{
1360 printk(KERN_NOTICE "OmniVision ov7670 sensor driver, at your service\n");
1361 return i2c_add_driver(&ov7670_driver);
1362}
1363
1364static void __exit ov7670_mod_exit(void)
1365{
1366 i2c_del_driver(&ov7670_driver);
1367}
1368
1369module_init(ov7670_mod_init);
1370module_exit(ov7670_mod_exit);
1371