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V4L/DVB (4908): Remove the fake RGB32 format from cafe_ccic
[deliverable/linux.git] / drivers / media / video / ov7670.c
CommitLineData
111f3356
JC		 1/*
2 * A V4L2 driver for OmniVision OV7670 cameras.
3 *
4 * Copyright 2006 One Laptop Per Child Association, Inc. Written
5 * by Jonathan Corbet with substantial inspiration from Mark
6 * McClelland's ovcamchip code.
7 *
8 * This file may be distributed under the terms of the GNU General
9 * Public License, version 2.
10 */
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <linux/slab.h>
15#include <linux/delay.h>
16#include <linux/videodev.h>
17#include <media/v4l2-common.h>
18#include <linux/i2c.h>
19
20
21MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net.");
22MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
23MODULE_LICENSE("GPL");
24
25/*
26 * Basic window sizes. These probably belong somewhere more globally
27 * useful.
28 */
29#define VGA_WIDTH 640
30#define VGA_HEIGHT 480
31#define QVGA_WIDTH 320
32#define QVGA_HEIGHT 240
33#define CIF_WIDTH 352
34#define CIF_HEIGHT 288
35#define QCIF_WIDTH 176
36#define QCIF_HEIGHT 144
37
38/*
39 * The 7670 sits on i2c with ID 0x42
40 */
41#define OV7670_I2C_ADDR 0x42
42
43/* Registers */
44#define REG_GAIN 0x00 /* Gain lower 8 bits (rest in vref) */
45#define REG_BLUE 0x01 /* blue gain */
46#define REG_RED 0x02 /* red gain */
47#define REG_VREF 0x03 /* Pieces of GAIN, VSTART, VSTOP */
48#define REG_COM1 0x04 /* Control 1 */
49#define COM1_CCIR656 0x40 /* CCIR656 enable */
50#define REG_BAVE 0x05 /* U/B Average level */
51#define REG_GbAVE 0x06 /* Y/Gb Average level */
52#define REG_AECHH 0x07 /* AEC MS 5 bits */
53#define REG_RAVE 0x08 /* V/R Average level */
54#define REG_COM2 0x09 /* Control 2 */
55#define COM2_SSLEEP 0x10 /* Soft sleep mode */
56#define REG_PID 0x0a /* Product ID MSB */
57#define REG_VER 0x0b /* Product ID LSB */
58#define REG_COM3 0x0c /* Control 3 */
59#define COM3_SWAP 0x40 /* Byte swap */
60#define COM3_SCALEEN 0x08 /* Enable scaling */
61#define COM3_DCWEN 0x04 /* Enable downsamp/crop/window */
62#define REG_COM4 0x0d /* Control 4 */
63#define REG_COM5 0x0e /* All "reserved" */
64#define REG_COM6 0x0f /* Control 6 */
65#define REG_AECH 0x10 /* More bits of AEC value */
66#define REG_CLKRC 0x11 /* Clocl control */
67#define CLK_EXT 0x40 /* Use external clock directly */
68#define CLK_SCALE 0x3f /* Mask for internal clock scale */
69#define REG_COM7 0x12 /* Control 7 */
70#define COM7_RESET 0x80 /* Register reset */
71#define COM7_FMT_MASK 0x38
72#define COM7_FMT_VGA 0x00
73#define COM7_FMT_CIF 0x20 /* CIF format */
74#define COM7_FMT_QVGA 0x10 /* QVGA format */
75#define COM7_FMT_QCIF 0x08 /* QCIF format */
76#define COM7_RGB 0x04 /* bits 0 and 2 - RGB format */
77#define COM7_YUV 0x00 /* YUV */
78#define COM7_BAYER 0x01 /* Bayer format */
79#define COM7_PBAYER 0x05 /* "Processed bayer" */
80#define REG_COM8 0x13 /* Control 8 */
81#define COM8_FASTAEC 0x80 /* Enable fast AGC/AEC */
82#define COM8_AECSTEP 0x40 /* Unlimited AEC step size */
83#define COM8_BFILT 0x20 /* Band filter enable */
84#define COM8_AGC 0x04 /* Auto gain enable */
85#define COM8_AWB 0x02 /* White balance enable */
86#define COM8_AEC 0x01 /* Auto exposure enable */
87#define REG_COM9 0x14 /* Control 9 - gain ceiling */
88#define REG_COM10 0x15 /* Control 10 */
89#define COM10_HSYNC 0x40 /* HSYNC instead of HREF */
90#define COM10_PCLK_HB 0x20 /* Suppress PCLK on horiz blank */
91#define COM10_HREF_REV 0x08 /* Reverse HREF */
92#define COM10_VS_LEAD 0x04 /* VSYNC on clock leading edge */
93#define COM10_VS_NEG 0x02 /* VSYNC negative */
94#define COM10_HS_NEG 0x01 /* HSYNC negative */
95#define REG_HSTART 0x17 /* Horiz start high bits */
96#define REG_HSTOP 0x18 /* Horiz stop high bits */
97#define REG_VSTART 0x19 /* Vert start high bits */
98#define REG_VSTOP 0x1a /* Vert stop high bits */
99#define REG_PSHFT 0x1b /* Pixel delay after HREF */
100#define REG_MIDH 0x1c /* Manuf. ID high */
101#define REG_MIDL 0x1d /* Manuf. ID low */
102#define REG_MVFP 0x1e /* Mirror / vflip */
103#define MVFP_MIRROR 0x20 /* Mirror image */
104#define MVFP_FLIP 0x10 /* Vertical flip */
105
106#define REG_AEW 0x24 /* AGC upper limit */
107#define REG_AEB 0x25 /* AGC lower limit */
108#define REG_VPT 0x26 /* AGC/AEC fast mode op region */
109#define REG_HSYST 0x30 /* HSYNC rising edge delay */
110#define REG_HSYEN 0x31 /* HSYNC falling edge delay */
111#define REG_HREF 0x32 /* HREF pieces */
112#define REG_TSLB 0x3a /* lots of stuff */
113#define TSLB_YLAST 0x04 /* UYVY or VYUY - see com13 */
114#define REG_COM11 0x3b /* Control 11 */
115#define COM11_NIGHT 0x80 /* NIght mode enable */
116#define COM11_NMFR 0x60 /* Two bit NM frame rate */
117#define COM11_HZAUTO 0x10 /* Auto detect 50/60 Hz */
118#define COM11_50HZ 0x08 /* Manual 50Hz select */
119#define COM11_EXP 0x02
120#define REG_COM12 0x3c /* Control 12 */
121#define COM12_HREF 0x80 /* HREF always */
122#define REG_COM13 0x3d /* Control 13 */
123#define COM13_GAMMA 0x80 /* Gamma enable */
124#define COM13_UVSAT 0x40 /* UV saturation auto adjustment */
125#define COM13_UVSWAP 0x01 /* V before U - w/TSLB */
126#define REG_COM14 0x3e /* Control 14 */
127#define COM14_DCWEN 0x10 /* DCW/PCLK-scale enable */
128#define REG_EDGE 0x3f /* Edge enhancement factor */
129#define REG_COM15 0x40 /* Control 15 */
130#define COM15_R10F0 0x00 /* Data range 10 to F0 */
131#define COM15_R01FE 0x80 /* 01 to FE */
132#define COM15_R00FF 0xc0 /* 00 to FF */
133#define COM15_RGB565 0x10 /* RGB565 output */
134#define COM15_RGB555 0x30 /* RGB555 output */
135#define REG_COM16 0x41 /* Control 16 */
136#define COM16_AWBGAIN 0x08 /* AWB gain enable */
137#define REG_COM17 0x42 /* Control 17 */
138#define COM17_AECWIN 0xc0 /* AEC window - must match COM4 */
139#define COM17_CBAR 0x08 /* DSP Color bar */
140
f9a76156
JC		 141/*
142 * This matrix defines how the colors are generated, must be
143 * tweaked to adjust hue and saturation.
144 *
145 * Order: v-red, v-green, v-blue, u-red, u-green, u-blue
146 *
147 * They are nine-bit signed quantities, with the sign bit
148 * stored in 0x58. Sign for v-red is bit 0, and up from there.
149 */
150#define REG_CMATRIX_BASE 0x4f
151#define CMATRIX_LEN 6
152#define REG_CMATRIX_SIGN 0x58
153
154
111f3356
JC		 155#define REG_BRIGHT 0x55 /* Brightness */
156#define REG_CONTRAS 0x56 /* Contrast control */
157
158#define REG_GFIX 0x69 /* Fix gain control */
159
160#define REG_RGB444 0x8c /* RGB 444 control */
161#define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */
162#define R444_RGBX 0x01 /* Empty nibble at end */
163
164#define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */
165#define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */
166
167#define REG_BD50MAX 0xa5 /* 50hz banding step limit */
168#define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */
169#define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */
170#define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */
171#define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */
172#define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
173#define REG_BD60MAX 0xab /* 60hz banding step limit */
174
175
f9a76156
JC		 176/*
177 * Information we maintain about a known sensor.
178 */
179struct ov7670_format_struct; /* coming later */
180struct ov7670_info {
181 struct ov7670_format_struct *fmt; /* Current format */
182 unsigned char sat; /* Saturation value */
183 int hue; /* Hue value */
184};
185
186
187
188
111f3356
JC		 189/*
190 * The default register settings, as obtained from OmniVision. There
191 * is really no making sense of most of these - lots of "reserved" values
192 * and such.
193 *
194 * These settings give VGA YUYV.
195 */
196
197struct regval_list {
198 unsigned char reg_num;
199 unsigned char value;
200};
201
202static struct regval_list ov7670_default_regs[] = {
203 { REG_COM7, COM7_RESET },
204/*
205 * Clock scale: 3 = 15fps
206 * 2 = 20fps
207 * 1 = 30fps
208 */
f9a76156 209 { REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */
111f3356
JC		 210 { REG_TSLB, 0x04 }, /* OV */
211 { REG_COM7, 0 }, /* VGA */
212 /*
213 * Set the hardware window. These values from OV don't entirely
214 * make sense - hstop is less than hstart. But they work...
215 */
216 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
217 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
218 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },
219
220 { REG_COM3, 0 }, { REG_COM14, 0 },
221 /* Mystery scaling numbers */
222 { 0x70, 0x3a }, { 0x71, 0x35 },
223 { 0x72, 0x11 }, { 0x73, 0xf0 },
224 { 0xa2, 0x02 }, { REG_COM10, 0x0 },
225
226 /* Gamma curve values */
227 { 0x7a, 0x20 }, { 0x7b, 0x10 },
228 { 0x7c, 0x1e }, { 0x7d, 0x35 },
229 { 0x7e, 0x5a }, { 0x7f, 0x69 },
230 { 0x80, 0x76 }, { 0x81, 0x80 },
231 { 0x82, 0x88 }, { 0x83, 0x8f },
232 { 0x84, 0x96 }, { 0x85, 0xa3 },
233 { 0x86, 0xaf }, { 0x87, 0xc4 },
234 { 0x88, 0xd7 }, { 0x89, 0xe8 },
235
236 /* AGC and AEC parameters. Note we start by disabling those features,
237 then turn them only after tweaking the values. */
238 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
239 { REG_GAIN, 0 }, { REG_AECH, 0 },
240 { REG_COM4, 0x40 }, /* magic reserved bit */
241 { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
242 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
243 { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
244 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
245 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */
246 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
247 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
248 { REG_HAECC7, 0x94 },
249 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
250
251 /* Almost all of these are magic "reserved" values. */
252 { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
253 { 0x16, 0x02 }, { REG_MVFP, 0x07|MVFP_MIRROR },
254 { 0x21, 0x02 }, { 0x22, 0x91 },
255 { 0x29, 0x07 }, { 0x33, 0x0b },
256 { 0x35, 0x0b }, { 0x37, 0x1d },
257 { 0x38, 0x71 }, { 0x39, 0x2a },
258 { REG_COM12, 0x78 }, { 0x4d, 0x40 },
259 { 0x4e, 0x20 }, { REG_GFIX, 0 },
260 { 0x6b, 0x4a }, { 0x74, 0x10 },
261 { 0x8d, 0x4f }, { 0x8e, 0 },
262 { 0x8f, 0 }, { 0x90, 0 },
263 { 0x91, 0 }, { 0x96, 0 },
264 { 0x9a, 0 }, { 0xb0, 0x84 },
265 { 0xb1, 0x0c }, { 0xb2, 0x0e },
266 { 0xb3, 0x82 }, { 0xb8, 0x0a },
267
268 /* More reserved magic, some of which tweaks white balance */
269 { 0x43, 0x0a }, { 0x44, 0xf0 },
270 { 0x45, 0x34 }, { 0x46, 0x58 },
271 { 0x47, 0x28 }, { 0x48, 0x3a },
272 { 0x59, 0x88 }, { 0x5a, 0x88 },
273 { 0x5b, 0x44 }, { 0x5c, 0x67 },
274 { 0x5d, 0x49 }, { 0x5e, 0x0e },
275 { 0x6c, 0x0a }, { 0x6d, 0x55 },
276 { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */
277 { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
278 { REG_RED, 0x60 },
279 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
280
281 /* Matrix coefficients */
282 { 0x4f, 0x80 }, { 0x50, 0x80 },
283 { 0x51, 0 }, { 0x52, 0x22 },
284 { 0x53, 0x5e }, { 0x54, 0x80 },
285 { 0x58, 0x9e },
286
287 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
288 { 0x75, 0x05 }, { 0x76, 0xe1 },
289 { 0x4c, 0 }, { 0x77, 0x01 },
290 { REG_COM13, 0xc3 }, { 0x4b, 0x09 },
291 { 0xc9, 0x60 }, { REG_COM16, 0x38 },
292 { 0x56, 0x40 },
293
294 { 0x34, 0x11 }, { REG_COM11, COM11_EXP },
295 { 0xa4, 0x88 }, { 0x96, 0 },
296 { 0x97, 0x30 }, { 0x98, 0x20 },
297 { 0x99, 0x30 }, { 0x9a, 0x84 },
298 { 0x9b, 0x29 }, { 0x9c, 0x03 },
299 { 0x9d, 0x4c }, { 0x9e, 0x3f },
300 { 0x78, 0x04 },
301
302 /* Extra-weird stuff. Some sort of multiplexor register */
303 { 0x79, 0x01 }, { 0xc8, 0xf0 },
304 { 0x79, 0x0f }, { 0xc8, 0x00 },
305 { 0x79, 0x10 }, { 0xc8, 0x7e },
306 { 0x79, 0x0a }, { 0xc8, 0x80 },
307 { 0x79, 0x0b }, { 0xc8, 0x01 },
308 { 0x79, 0x0c }, { 0xc8, 0x0f },
309 { 0x79, 0x0d }, { 0xc8, 0x20 },
310 { 0x79, 0x09 }, { 0xc8, 0x80 },
311 { 0x79, 0x02 }, { 0xc8, 0xc0 },
312 { 0x79, 0x03 }, { 0xc8, 0x40 },
313 { 0x79, 0x05 }, { 0xc8, 0x30 },
314 { 0x79, 0x26 },
315
111f3356
JC		 316 { 0xff, 0xff }, /* END MARKER */
317};
318
319
320/*
321 * Here we'll try to encapsulate the changes for just the output
322 * video format.
323 *
324 * RGB656 and YUV422 come from OV; RGB444 is homebrewed.
325 *
326 * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why.
327 */
328
329
330static struct regval_list ov7670_fmt_yuv422[] = {
331 { REG_COM7, 0x0 }, /* Selects YUV mode */
332 { REG_RGB444, 0 }, /* No RGB444 please */
333 { REG_COM1, 0 },
334 { REG_COM15, COM15_R00FF },
335 { REG_COM9, 0x18 }, /* 4x gain ceiling; 0x8 is reserved bit */
336 { 0x4f, 0x80 }, /* "matrix coefficient 1" */
337 { 0x50, 0x80 }, /* "matrix coefficient 2" */
f9a76156 338 { 0x51, 0 }, /* vb */
111f3356
JC		 339 { 0x52, 0x22 }, /* "matrix coefficient 4" */
340 { 0x53, 0x5e }, /* "matrix coefficient 5" */
341 { 0x54, 0x80 }, /* "matrix coefficient 6" */
342 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
343 { 0xff, 0xff },
344};
345
346static struct regval_list ov7670_fmt_rgb565[] = {
347 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
348 { REG_RGB444, 0 }, /* No RGB444 please */
349 { REG_COM1, 0x0 },
350 { REG_COM15, COM15_RGB565 },
351 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
352 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
353 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
f9a76156 354 { 0x51, 0 }, /* vb */
111f3356
JC		 355 { 0x52, 0x3d }, /* "matrix coefficient 4" */
356 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
357 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
358 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
359 { 0xff, 0xff },
360};
361
362static struct regval_list ov7670_fmt_rgb444[] = {
363 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
364 { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */
365 { REG_COM1, 0x40 }, /* Magic reserved bit */
366 { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */
367 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
368 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
369 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
f9a76156 370 { 0x51, 0 }, /* vb */
111f3356
JC		 371 { 0x52, 0x3d }, /* "matrix coefficient 4" */
372 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
373 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
374 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */
375 { 0xff, 0xff },
376};
377
378
379
380
381/*
382 * Low-level register I/O.
383 */
384
385static int ov7670_read(struct i2c_client *c, unsigned char reg,
386 unsigned char *value)
387{
388 int ret;
389
390 ret = i2c_smbus_read_byte_data(c, reg);
f9a76156 391 if (ret >= 0)
111f3356
JC		 392 *value = (unsigned char) ret;
393 return ret;
394}
395
396
397static int ov7670_write(struct i2c_client *c, unsigned char reg,
398 unsigned char value)
399{
400 return i2c_smbus_write_byte_data(c, reg, value);
401}
402
403
404/*
405 * Write a list of register settings; ff/ff stops the process.
406 */
407static int ov7670_write_array(struct i2c_client *c, struct regval_list *vals)
408{
409 while (vals->reg_num != 0xff || vals->value != 0xff) {
410 int ret = ov7670_write(c, vals->reg_num, vals->value);
411 if (ret < 0)
412 return ret;
413 vals++;
414 }
415 return 0;
416}
417
418
419/*
420 * Stuff that knows about the sensor.
421 */
422static void ov7670_reset(struct i2c_client *client)
423{
424 ov7670_write(client, REG_COM7, COM7_RESET);
425 msleep(1);
426}
427
428
429static int ov7670_init(struct i2c_client *client)
430{
431 return ov7670_write_array(client, ov7670_default_regs);
432}
433
434
435
436static int ov7670_detect(struct i2c_client *client)
437{
438 unsigned char v;
439 int ret;
440
441 ret = ov7670_init(client);
442 if (ret < 0)
443 return ret;
444 ret = ov7670_read(client, REG_MIDH, &v);
445 if (ret < 0)
446 return ret;
447 if (v != 0x7f) /* OV manuf. id. */
448 return -ENODEV;
449 ret = ov7670_read(client, REG_MIDL, &v);
450 if (ret < 0)
451 return ret;
452 if (v != 0xa2)
453 return -ENODEV;
454 /*
455 * OK, we know we have an OmniVision chip...but which one?
456 */
457 ret = ov7670_read(client, REG_PID, &v);
458 if (ret < 0)
459 return ret;
460 if (v != 0x76) /* PID + VER = 0x76 / 0x73 */
461 return -ENODEV;
462 ret = ov7670_read(client, REG_VER, &v);
463 if (ret < 0)
464 return ret;
465 if (v != 0x73) /* PID + VER = 0x76 / 0x73 */
466 return -ENODEV;
467 return 0;
468}
469
470
f9a76156
JC		 471/*
472 * Store information about the video data format. The color matrix
473 * is deeply tied into the format, so keep the relevant values here.
474 * The magic matrix nubmers come from OmniVision.
475 */
111f3356
JC		 476static struct ov7670_format_struct {
477 __u8 *desc;
478 __u32 pixelformat;
479 struct regval_list *regs;
f9a76156 480 int cmatrix[CMATRIX_LEN];
111f3356
JC		 481} ov7670_formats[] = {
482 {
483 .desc = "YUYV 4:2:2",
484 .pixelformat = V4L2_PIX_FMT_YUYV,
485 .regs = ov7670_fmt_yuv422,
f9a76156 486 .cmatrix = { 128, -128, 0, -34, -94, 128 },
111f3356
JC		 487 },
488 {
489 .desc = "RGB 444",
490 .pixelformat = V4L2_PIX_FMT_RGB444,
491 .regs = ov7670_fmt_rgb444,
f9a76156 492 .cmatrix = { 179, -179, 0, -61, -176, 228 },
111f3356
JC		 493 },
494 {
495 .desc = "RGB 565",
496 .pixelformat = V4L2_PIX_FMT_RGB565,
497 .regs = ov7670_fmt_rgb565,
f9a76156 498 .cmatrix = { 179, -179, 0, -61, -176, 228 },
111f3356 499 },
111f3356
JC		 500};
501#define N_OV7670_FMTS (sizeof(ov7670_formats)/sizeof(ov7670_formats[0]))
502
503/*
504 * All formats we support are 2 bytes/pixel.
505 */
506#define BYTES_PER_PIXEL 2
507
508/*
509 * Then there is the issue of window sizes. Try to capture the info here.
510 */
f9a76156
JC		 511
512/*
513 * QCIF mode is done (by OV) in a very strange way - it actually looks like
514 * VGA with weird scaling options - they do *not* use the canned QCIF mode
515 * which is allegedly provided by the sensor. So here's the weird register
516 * settings.
517 */
518static struct regval_list ov7670_qcif_regs[] = {
519 { REG_COM3, COM3_SCALEEN|COM3_DCWEN },
520 { REG_COM3, COM3_DCWEN },
521 { REG_COM14, COM14_DCWEN | 0x01},
522 { 0x73, 0xf1 },
523 { 0xa2, 0x52 },
524 { 0x7b, 0x1c },
525 { 0x7c, 0x28 },
526 { 0x7d, 0x3c },
527 { 0x7f, 0x69 },
528 { REG_COM9, 0x38 },
529 { 0xa1, 0x0b },
530 { 0x74, 0x19 },
531 { 0x9a, 0x80 },
532 { 0x43, 0x14 },
533 { REG_COM13, 0xc0 },
534 { 0xff, 0xff },
535};
536
111f3356
JC		 537static struct ov7670_win_size {
538 int width;
539 int height;
540 unsigned char com7_bit;
541 int hstart; /* Start/stop values for the camera. Note */
542 int hstop; /* that they do not always make complete */
543 int vstart; /* sense to humans, but evidently the sensor */
544 int vstop; /* will do the right thing... */
f9a76156 545 struct regval_list *regs; /* Regs to tweak */
111f3356
JC		 546/* h/vref stuff */
547} ov7670_win_sizes[] = {
548 /* VGA */
549 {
550 .width = VGA_WIDTH,
551 .height = VGA_HEIGHT,
552 .com7_bit = COM7_FMT_VGA,
553 .hstart = 158, /* These values from */
554 .hstop = 14, /* Omnivision */
555 .vstart = 10,
556 .vstop = 490,
f9a76156 557 .regs = NULL,
111f3356
JC		 558 },
559 /* CIF */
560 {
561 .width = CIF_WIDTH,
562 .height = CIF_HEIGHT,
563 .com7_bit = COM7_FMT_CIF,
564 .hstart = 170, /* Empirically determined */
565 .hstop = 90,
566 .vstart = 14,
567 .vstop = 494,
f9a76156 568 .regs = NULL,
111f3356
JC		 569 },
570 /* QVGA */
571 {
572 .width = QVGA_WIDTH,
573 .height = QVGA_HEIGHT,
574 .com7_bit = COM7_FMT_QVGA,
575 .hstart = 164, /* Empirically determined */
576 .hstop = 20,
577 .vstart = 14,
578 .vstop = 494,
f9a76156
JC		 579 .regs = NULL,
580 },
581 /* QCIF */
582 {
583 .width = QCIF_WIDTH,
584 .height = QCIF_HEIGHT,
585 .com7_bit = COM7_FMT_VGA, /* see comment above */
586 .hstart = 456, /* Empirically determined */
587 .hstop = 24,
588 .vstart = 14,
589 .vstop = 494,
590 .regs = ov7670_qcif_regs,
111f3356
JC		 591 },
592};
593
594#define N_WIN_SIZES (sizeof(ov7670_win_sizes)/sizeof(ov7670_win_sizes[0]))
595
596
597/*
598 * Store a set of start/stop values into the camera.
599 */
600static int ov7670_set_hw(struct i2c_client *client, int hstart, int hstop,
601 int vstart, int vstop)
602{
603 int ret;
604 unsigned char v;
605/*
606 * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of
607 * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is
608 * a mystery "edge offset" value in the top two bits of href.
609 */
610 ret = ov7670_write(client, REG_HSTART, (hstart >> 3) & 0xff);
611 ret += ov7670_write(client, REG_HSTOP, (hstop >> 3) & 0xff);
612 ret += ov7670_read(client, REG_HREF, &v);
613 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
614 msleep(10);
615 ret += ov7670_write(client, REG_HREF, v);
616/*
617 * Vertical: similar arrangement, but only 10 bits.
618 */
619 ret += ov7670_write(client, REG_VSTART, (vstart >> 2) & 0xff);
620 ret += ov7670_write(client, REG_VSTOP, (vstop >> 2) & 0xff);
621 ret += ov7670_read(client, REG_VREF, &v);
622 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
623 msleep(10);
624 ret += ov7670_write(client, REG_VREF, v);
625 return ret;
626}
627
628
629static int ov7670_enum_fmt(struct i2c_client *c, struct v4l2_fmtdesc *fmt)
630{
631 struct ov7670_format_struct *ofmt;
632
633 if (fmt->index >= N_OV7670_FMTS)
634 return -EINVAL;
635
636 ofmt = ov7670_formats + fmt->index;
637 fmt->flags = 0;
638 strcpy(fmt->description, ofmt->desc);
639 fmt->pixelformat = ofmt->pixelformat;
640 return 0;
641}
642
643
644static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt,
645 struct ov7670_format_struct **ret_fmt,
646 struct ov7670_win_size **ret_wsize)
647{
648 int index;
649 struct ov7670_win_size *wsize;
650 struct v4l2_pix_format *pix = &fmt->fmt.pix;
651
652 for (index = 0; index < N_OV7670_FMTS; index++)
653 if (ov7670_formats[index].pixelformat == pix->pixelformat)
654 break;
655 if (index >= N_OV7670_FMTS)
656 return -EINVAL;
657 if (ret_fmt != NULL)
658 *ret_fmt = ov7670_formats + index;
659 /*
660 * Fields: the OV devices claim to be progressive.
661 */
662 if (pix->field == V4L2_FIELD_ANY)
663 pix->field = V4L2_FIELD_NONE;
664 else if (pix->field != V4L2_FIELD_NONE)
665 return -EINVAL;
666 /*
667 * Round requested image size down to the nearest
668 * we support, but not below the smallest.
669 */
670 for (wsize = ov7670_win_sizes; wsize < ov7670_win_sizes + N_WIN_SIZES;
671 wsize++)
672 if (pix->width >= wsize->width && pix->height >= wsize->height)
673 break;
f9a76156 674 if (wsize >= ov7670_win_sizes + N_WIN_SIZES)
111f3356
JC		 675 wsize--; /* Take the smallest one */
676 if (ret_wsize != NULL)
677 *ret_wsize = wsize;
678 /*
679 * Note the size we'll actually handle.
680 */
681 pix->width = wsize->width;
682 pix->height = wsize->height;
683 pix->bytesperline = pix->width*BYTES_PER_PIXEL;
111f3356
JC		 684 pix->sizeimage = pix->height*pix->bytesperline;
685 return 0;
111f3356
JC		 686}
687
688/*
689 * Set a format.
690 */
691static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt)
692{
693 int ret;
694 struct ov7670_format_struct *ovfmt;
695 struct ov7670_win_size *wsize;
f9a76156 696 struct ov7670_info *info = i2c_get_clientdata(c);
111f3356
JC		 697 unsigned char com7;
698
699 ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize);
700 if (ret)
701 return ret;
702 /*
703 * COM7 is a pain in the ass, it doesn't like to be read then
704 * quickly written afterward. But we have everything we need
705 * to set it absolutely here, as long as the format-specific
706 * register sets list it first.
707 */
708 com7 = ovfmt->regs[0].value;
709 com7 |= wsize->com7_bit;
710 ov7670_write(c, REG_COM7, com7);
711 /*
712 * Now write the rest of the array. Also store start/stops
713 */
714 ov7670_write_array(c, ovfmt->regs + 1);
715 ov7670_set_hw(c, wsize->hstart, wsize->hstop, wsize->vstart,
716 wsize->vstop);
f9a76156
JC		 717 ret = 0;
718 if (wsize->regs)
719 ret = ov7670_write_array(c, wsize->regs);
720 info->fmt = ovfmt;
111f3356
JC		 721 return 0;
722}
723
724/*
725 * Code for dealing with controls.
726 */
727
f9a76156
JC		 728
729
730
731
732static int ov7670_store_cmatrix(struct i2c_client *client,
733 int matrix[CMATRIX_LEN])
734{
735 int i, ret;
736 unsigned char signbits;
737
738 /*
739 * Weird crap seems to exist in the upper part of
740 * the sign bits register, so let's preserve it.
741 */
742 ret = ov7670_read(client, REG_CMATRIX_SIGN, &signbits);
743 signbits &= 0xc0;
744
745 for (i = 0; i < CMATRIX_LEN; i++) {
746 unsigned char raw;
747
748 if (matrix[i] < 0) {
749 signbits |= (1 << i);
750 if (matrix[i] < -255)
751 raw = 0xff;
752 else
753 raw = (-1 * matrix[i]) & 0xff;
754 }
755 else {
756 if (matrix[i] > 255)
757 raw = 0xff;
758 else
759 raw = matrix[i] & 0xff;
760 }
761 ret += ov7670_write(client, REG_CMATRIX_BASE + i, raw);
762 }
763 ret += ov7670_write(client, REG_CMATRIX_SIGN, signbits);
764 return ret;
765}
766
767
768/*
769 * Hue also requires messing with the color matrix. It also requires
770 * trig functions, which tend not to be well supported in the kernel.
771 * So here is a simple table of sine values, 0-90 degrees, in steps
772 * of five degrees. Values are multiplied by 1000.
773 *
774 * The following naive approximate trig functions require an argument
775 * carefully limited to -180 <= theta <= 180.
776 */
777#define SIN_STEP 5
778static const int ov7670_sin_table[] = {
779 0, 87, 173, 258, 342, 422,
780 499, 573, 642, 707, 766, 819,
781 866, 906, 939, 965, 984, 996,
782 1000
783};
784
785static int ov7670_sine(int theta)
786{
787 int chs = 1;
788 int sine;
789
790 if (theta < 0) {
791 theta = -theta;
792 chs = -1;
793 }
794 if (theta <= 90)
795 sine = ov7670_sin_table[theta/SIN_STEP];
796 else {
797 theta -= 90;
798 sine = 1000 - ov7670_sin_table[theta/SIN_STEP];
799 }
800 return sine*chs;
801}
802
803static int ov7670_cosine(int theta)
804{
805 theta = 90 - theta;
806 if (theta > 180)
807 theta -= 360;
808 else if (theta < -180)
809 theta += 360;
810 return ov7670_sine(theta);
811}
812
813
814
815
816static void ov7670_calc_cmatrix(struct ov7670_info *info,
817 int matrix[CMATRIX_LEN])
818{
819 int i;
820 /*
821 * Apply the current saturation setting first.
822 */
823 for (i = 0; i < CMATRIX_LEN; i++)
824 matrix[i] = (info->fmt->cmatrix[i]*info->sat) >> 7;
825 /*
826 * Then, if need be, rotate the hue value.
827 */
828 if (info->hue != 0) {
829 int sinth, costh, tmpmatrix[CMATRIX_LEN];
830
831 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
832 sinth = ov7670_sine(info->hue);
833 costh = ov7670_cosine(info->hue);
834
835 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000;
836 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000;
837 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000;
838 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000;
839 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000;
840 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000;
841 }
842}
843
844
845
846static int ov7670_t_sat(struct i2c_client *client, int value)
847{
848 struct ov7670_info *info = i2c_get_clientdata(client);
849 int matrix[CMATRIX_LEN];
850 int ret;
851
852 info->sat = value;
853 ov7670_calc_cmatrix(info, matrix);
854 ret = ov7670_store_cmatrix(client, matrix);
855 return ret;
856}
857
858static int ov7670_q_sat(struct i2c_client *client, __s32 *value)
859{
860 struct ov7670_info *info = i2c_get_clientdata(client);
861
862 *value = info->sat;
863 return 0;
864}
865
866static int ov7670_t_hue(struct i2c_client *client, int value)
867{
868 struct ov7670_info *info = i2c_get_clientdata(client);
869 int matrix[CMATRIX_LEN];
870 int ret;
871
872 if (value < -180 || value > 180)
873 return -EINVAL;
874 info->hue = value;
875 ov7670_calc_cmatrix(info, matrix);
876 ret = ov7670_store_cmatrix(client, matrix);
877 return ret;
878}
879
880
881static int ov7670_q_hue(struct i2c_client *client, __s32 *value)
882{
883 struct ov7670_info *info = i2c_get_clientdata(client);
884
885 *value = info->hue;
886 return 0;
887}
888
889
111f3356
JC		 890/*
891 * Some weird registers seem to store values in a sign/magnitude format!
892 */
893static unsigned char ov7670_sm_to_abs(unsigned char v)
894{
895 if ((v & 0x80) == 0)
896 return v + 128;
897 else
898 return 128 - (v & 0x7f);
899}
900
901
902static unsigned char ov7670_abs_to_sm(unsigned char v)
903{
904 if (v > 127)
905 return v & 0x7f;
906 else
907 return (128 - v) | 0x80;
908}
909
f9a76156 910static int ov7670_t_brightness(struct i2c_client *client, int value)
111f3356 911{
f9a76156 912 unsigned char com8, v;
111f3356
JC		 913 int ret;
914
915 ov7670_read(client, REG_COM8, &com8);
916 com8 &= ~COM8_AEC;
917 ov7670_write(client, REG_COM8, com8);
f9a76156
JC		 918 v = ov7670_abs_to_sm(value);
919 ret = ov7670_write(client, REG_BRIGHT, v);
111f3356
JC		 920 return ret;
921}
922
f9a76156 923static int ov7670_q_brightness(struct i2c_client *client, __s32 *value)
111f3356 924{
f9a76156
JC		 925 unsigned char v;
926 int ret = ov7670_read(client, REG_BRIGHT, &v);
927
928 *value = ov7670_sm_to_abs(v);
111f3356
JC		 929 return ret;
930}
931
f9a76156 932static int ov7670_t_contrast(struct i2c_client *client, int value)
111f3356 933{
f9a76156 934 return ov7670_write(client, REG_CONTRAS, (unsigned char) value);
111f3356
JC		 935}
936
f9a76156 937static int ov7670_q_contrast(struct i2c_client *client, __s32 *value)
111f3356 938{
f9a76156
JC		 939 unsigned char v;
940 int ret = ov7670_read(client, REG_CONTRAS, &v);
941
942 *value = v;
943 return ret;
111f3356
JC		 944}
945
f9a76156 946static int ov7670_q_hflip(struct i2c_client *client, __s32 *value)
111f3356
JC		 947{
948 int ret;
949 unsigned char v;
950
951 ret = ov7670_read(client, REG_MVFP, &v);
952 *value = (v & MVFP_MIRROR) == MVFP_MIRROR;
953 return ret;
954}
955
956
f9a76156 957static int ov7670_t_hflip(struct i2c_client *client, int value)
111f3356
JC		 958{
959 unsigned char v;
960 int ret;
961
962 ret = ov7670_read(client, REG_MVFP, &v);
963 if (value)
964 v |= MVFP_MIRROR;
965 else
966 v &= ~MVFP_MIRROR;
967 msleep(10); /* FIXME */
968 ret += ov7670_write(client, REG_MVFP, v);
969 return ret;
970}
971
972
973
f9a76156 974static int ov7670_q_vflip(struct i2c_client *client, __s32 *value)
111f3356
JC		 975{
976 int ret;
977 unsigned char v;
978
979 ret = ov7670_read(client, REG_MVFP, &v);
980 *value = (v & MVFP_FLIP) == MVFP_FLIP;
981 return ret;
982}
983
984
f9a76156 985static int ov7670_t_vflip(struct i2c_client *client, int value)
111f3356
JC		 986{
987 unsigned char v;
988 int ret;
989
990 ret = ov7670_read(client, REG_MVFP, &v);
991 if (value)
992 v |= MVFP_FLIP;
993 else
994 v &= ~MVFP_FLIP;
995 msleep(10); /* FIXME */
996 ret += ov7670_write(client, REG_MVFP, v);
997 return ret;
998}
999
1000
1001static struct ov7670_control {
1002 struct v4l2_queryctrl qc;
f9a76156
JC		 1003 int (*query)(struct i2c_client *c, __s32 *value);
1004 int (*tweak)(struct i2c_client *c, int value);
111f3356
JC		 1005} ov7670_controls[] =
1006{
1007 {
1008 .qc = {
1009 .id = V4L2_CID_BRIGHTNESS,
1010 .type = V4L2_CTRL_TYPE_INTEGER,
1011 .name = "Brightness",
1012 .minimum = 0,
1013 .maximum = 255,
1014 .step = 1,
1015 .default_value = 0x80,
1016 .flags = V4L2_CTRL_FLAG_SLIDER
1017 },
1018 .tweak = ov7670_t_brightness,
1019 .query = ov7670_q_brightness,
1020 },
1021 {
1022 .qc = {
1023 .id = V4L2_CID_CONTRAST,
1024 .type = V4L2_CTRL_TYPE_INTEGER,
1025 .name = "Contrast",
1026 .minimum = 0,
1027 .maximum = 127,
1028 .step = 1,
1029 .default_value = 0x40, /* XXX ov7670 spec */
1030 .flags = V4L2_CTRL_FLAG_SLIDER
1031 },
1032 .tweak = ov7670_t_contrast,
1033 .query = ov7670_q_contrast,
1034 },
f9a76156
JC		 1035 {
1036 .qc = {
1037 .id = V4L2_CID_SATURATION,
1038 .type = V4L2_CTRL_TYPE_INTEGER,
1039 .name = "Saturation",
1040 .minimum = 0,
1041 .maximum = 256,
1042 .step = 1,
1043 .default_value = 0x80,
1044 .flags = V4L2_CTRL_FLAG_SLIDER
1045 },
1046 .tweak = ov7670_t_sat,
1047 .query = ov7670_q_sat,
1048 },
1049 {
1050 .qc = {
1051 .id = V4L2_CID_HUE,
1052 .type = V4L2_CTRL_TYPE_INTEGER,
1053 .name = "HUE",
1054 .minimum = -180,
1055 .maximum = 180,
1056 .step = 5,
1057 .default_value = 0,
1058 .flags = V4L2_CTRL_FLAG_SLIDER
1059 },
1060 .tweak = ov7670_t_hue,
1061 .query = ov7670_q_hue,
1062 },
111f3356
JC		 1063 {
1064 .qc = {
1065 .id = V4L2_CID_VFLIP,
1066 .type = V4L2_CTRL_TYPE_BOOLEAN,
1067 .name = "Vertical flip",
1068 .minimum = 0,
1069 .maximum = 1,
1070 .step = 1,
1071 .default_value = 0,
1072 },
1073 .tweak = ov7670_t_vflip,
1074 .query = ov7670_q_vflip,
1075 },
1076 {
1077 .qc = {
1078 .id = V4L2_CID_HFLIP,
1079 .type = V4L2_CTRL_TYPE_BOOLEAN,
1080 .name = "Horizontal mirror",
1081 .minimum = 0,
1082 .maximum = 1,
1083 .step = 1,
1084 .default_value = 0,
1085 },
1086 .tweak = ov7670_t_hflip,
1087 .query = ov7670_q_hflip,
1088 },
1089};
1090#define N_CONTROLS (sizeof(ov7670_controls)/sizeof(ov7670_controls[0]))
1091
1092static struct ov7670_control *ov7670_find_control(__u32 id)
1093{
1094 int i;
1095
1096 for (i = 0; i < N_CONTROLS; i++)
1097 if (ov7670_controls[i].qc.id == id)
1098 return ov7670_controls + i;
1099 return NULL;
1100}
1101
1102
1103static int ov7670_queryctrl(struct i2c_client *client,
1104 struct v4l2_queryctrl *qc)
1105{
1106 struct ov7670_control *ctrl = ov7670_find_control(qc->id);
1107
1108 if (ctrl == NULL)
1109 return -EINVAL;
1110 *qc = ctrl->qc;
1111 return 0;
1112}
1113
1114static int ov7670_g_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1115{
1116 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
1117 int ret;
111f3356
JC		 1118
1119 if (octrl == NULL)
1120 return -EINVAL;
f9a76156
JC		 1121 ret = octrl->query(client, &ctrl->value);
1122 if (ret >= 0)
111f3356 1123 return 0;
111f3356
JC		 1124 return ret;
1125}
1126
1127static int ov7670_s_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1128{
1129 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
f9a76156 1130 int ret;
111f3356
JC		 1131
1132 if (octrl == NULL)
1133 return -EINVAL;
f9a76156
JC		 1134 ret = octrl->tweak(client, ctrl->value);
1135 if (ret >= 0)
1136 return 0;
1137 return ret;
111f3356
JC		 1138}
1139
1140
1141
1142
1143
1144
111f3356
JC		 1145/*
1146 * Basic i2c stuff.
1147 */
1148static struct i2c_driver ov7670_driver;
1149
1150static int ov7670_attach(struct i2c_adapter *adapter)
1151{
1152 int ret;
1153 struct i2c_client *client;
f9a76156 1154 struct ov7670_info *info;
111f3356 1155
111f3356
JC		 1156 /*
1157 * For now: only deal with adapters we recognize.
1158 */
1159 if (adapter->id != I2C_HW_SMBUS_CAFE)
1160 return -ENODEV;
1161
111f3356
JC		 1162 client = kzalloc(sizeof (struct i2c_client), GFP_KERNEL);
1163 if (! client)
1164 return -ENOMEM;
1165 client->adapter = adapter;
1166 client->addr = OV7670_I2C_ADDR;
1167 client->driver = &ov7670_driver,
1168 strcpy(client->name, "OV7670");
f9a76156
JC		 1169 /*
1170 * Set up our info structure.
1171 */
1172 info = kzalloc(sizeof (struct ov7670_info), GFP_KERNEL);
1173 if (! info) {
1174 ret = -ENOMEM;
1175 goto out_free;
1176 }
1177 info->fmt = &ov7670_formats[0];
1178 info->sat = 128; /* Review this */
1179 i2c_set_clientdata(client, info);
111f3356
JC		 1180
1181 /*
1182 * Make sure it's an ov7670
1183 */
1184 ret = ov7670_detect(client);
111f3356 1185 if (ret)
f9a76156 1186 goto out_free_info;
111f3356
JC		 1187 i2c_attach_client(client);
1188 return 0;
1189
f9a76156
JC		 1190 out_free_info:
1191 kfree(info);
111f3356
JC		 1192 out_free:
1193 kfree(client);
1194 return ret;
1195}
1196
1197
1198static int ov7670_detach(struct i2c_client *client)
1199{
1200 i2c_detach_client(client);
f9a76156 1201 kfree(i2c_get_clientdata(client));
111f3356
JC		 1202 kfree(client);
1203 return 0;
1204}
1205
1206
1207static int ov7670_command(struct i2c_client *client, unsigned int cmd,
1208 void *arg)
1209{
1210 switch (cmd) {
1211 case VIDIOC_INT_G_CHIP_IDENT:
1212 * (enum v4l2_chip_ident *) arg = V4L2_IDENT_OV7670;
1213 return 0;
1214
1215 case VIDIOC_INT_RESET:
1216 ov7670_reset(client);
1217 return 0;
1218
1219 case VIDIOC_INT_INIT:
1220 return ov7670_init(client);
1221
1222 case VIDIOC_ENUM_FMT:
1223 return ov7670_enum_fmt(client, (struct v4l2_fmtdesc *) arg);
1224 case VIDIOC_TRY_FMT:
1225 return ov7670_try_fmt(client, (struct v4l2_format *) arg, NULL, NULL);
1226 case VIDIOC_S_FMT:
1227 return ov7670_s_fmt(client, (struct v4l2_format *) arg);
1228 case VIDIOC_QUERYCTRL:
1229 return ov7670_queryctrl(client, (struct v4l2_queryctrl *) arg);
1230 case VIDIOC_S_CTRL:
1231 return ov7670_s_ctrl(client, (struct v4l2_control *) arg);
1232 case VIDIOC_G_CTRL:
1233 return ov7670_g_ctrl(client, (struct v4l2_control *) arg);
1234 /* Todo:
1235 g/s_parm
1236 initialization
1237 */
1238 }
1239 return -EINVAL;
1240}
1241
1242
1243
1244static struct i2c_driver ov7670_driver = {
1245 .driver = {
1246 .name = "ov7670",
1247 },
1248 .id = I2C_DRIVERID_OV7670,
1249 .class = I2C_CLASS_CAM_DIGITAL,
1250 .attach_adapter = ov7670_attach,
1251 .detach_client = ov7670_detach,
1252 .command = ov7670_command,
1253};
1254
1255
1256/*
1257 * Module initialization
1258 */
1259static int __init ov7670_mod_init(void)
1260{
1261 printk(KERN_NOTICE "OmniVision ov7670 sensor driver, at your service\n");
1262 return i2c_add_driver(&ov7670_driver);
1263}
1264
1265static void __exit ov7670_mod_exit(void)
1266{
1267 i2c_del_driver(&ov7670_driver);
1268}
1269
1270module_init(ov7670_mod_init);
1271module_exit(ov7670_mod_exit);
Linux kernel - Deliverables
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