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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / ov7670.c
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
21 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
22 MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
23 MODULE_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 * Our nominal (default) frame rate.
40 */
41 #define OV7670_FRAME_RATE 30
42
43 /*
44 * The 7670 sits on i2c with ID 0x42
45 */
46 #define OV7670_I2C_ADDR 0x42
47
48 /* Registers */
49 #define REG_GAIN 0x00 /* Gain lower 8 bits (rest in vref) */
50 #define REG_BLUE 0x01 /* blue gain */
51 #define REG_RED 0x02 /* red gain */
52 #define REG_VREF 0x03 /* Pieces of GAIN, VSTART, VSTOP */
53 #define REG_COM1 0x04 /* Control 1 */
54 #define COM1_CCIR656 0x40 /* CCIR656 enable */
55 #define REG_BAVE 0x05 /* U/B Average level */
56 #define REG_GbAVE 0x06 /* Y/Gb Average level */
57 #define REG_AECHH 0x07 /* AEC MS 5 bits */
58 #define REG_RAVE 0x08 /* V/R Average level */
59 #define REG_COM2 0x09 /* Control 2 */
60 #define COM2_SSLEEP 0x10 /* Soft sleep mode */
61 #define REG_PID 0x0a /* Product ID MSB */
62 #define REG_VER 0x0b /* Product ID LSB */
63 #define REG_COM3 0x0c /* Control 3 */
64 #define COM3_SWAP 0x40 /* Byte swap */
65 #define COM3_SCALEEN 0x08 /* Enable scaling */
66 #define COM3_DCWEN 0x04 /* Enable downsamp/crop/window */
67 #define REG_COM4 0x0d /* Control 4 */
68 #define REG_COM5 0x0e /* All "reserved" */
69 #define REG_COM6 0x0f /* Control 6 */
70 #define REG_AECH 0x10 /* More bits of AEC value */
71 #define REG_CLKRC 0x11 /* Clocl control */
72 #define CLK_EXT 0x40 /* Use external clock directly */
73 #define CLK_SCALE 0x3f /* Mask for internal clock scale */
74 #define REG_COM7 0x12 /* Control 7 */
75 #define COM7_RESET 0x80 /* Register reset */
76 #define COM7_FMT_MASK 0x38
77 #define COM7_FMT_VGA 0x00
78 #define COM7_FMT_CIF 0x20 /* CIF format */
79 #define COM7_FMT_QVGA 0x10 /* QVGA format */
80 #define COM7_FMT_QCIF 0x08 /* QCIF format */
81 #define COM7_RGB 0x04 /* bits 0 and 2 - RGB format */
82 #define COM7_YUV 0x00 /* YUV */
83 #define COM7_BAYER 0x01 /* Bayer format */
84 #define COM7_PBAYER 0x05 /* "Processed bayer" */
85 #define REG_COM8 0x13 /* Control 8 */
86 #define COM8_FASTAEC 0x80 /* Enable fast AGC/AEC */
87 #define COM8_AECSTEP 0x40 /* Unlimited AEC step size */
88 #define COM8_BFILT 0x20 /* Band filter enable */
89 #define COM8_AGC 0x04 /* Auto gain enable */
90 #define COM8_AWB 0x02 /* White balance enable */
91 #define COM8_AEC 0x01 /* Auto exposure enable */
92 #define REG_COM9 0x14 /* Control 9 - gain ceiling */
93 #define REG_COM10 0x15 /* Control 10 */
94 #define COM10_HSYNC 0x40 /* HSYNC instead of HREF */
95 #define COM10_PCLK_HB 0x20 /* Suppress PCLK on horiz blank */
96 #define COM10_HREF_REV 0x08 /* Reverse HREF */
97 #define COM10_VS_LEAD 0x04 /* VSYNC on clock leading edge */
98 #define COM10_VS_NEG 0x02 /* VSYNC negative */
99 #define COM10_HS_NEG 0x01 /* HSYNC negative */
100 #define REG_HSTART 0x17 /* Horiz start high bits */
101 #define REG_HSTOP 0x18 /* Horiz stop high bits */
102 #define REG_VSTART 0x19 /* Vert start high bits */
103 #define REG_VSTOP 0x1a /* Vert stop high bits */
104 #define REG_PSHFT 0x1b /* Pixel delay after HREF */
105 #define REG_MIDH 0x1c /* Manuf. ID high */
106 #define REG_MIDL 0x1d /* Manuf. ID low */
107 #define REG_MVFP 0x1e /* Mirror / vflip */
108 #define MVFP_MIRROR 0x20 /* Mirror image */
109 #define MVFP_FLIP 0x10 /* Vertical flip */
110
111 #define REG_AEW 0x24 /* AGC upper limit */
112 #define REG_AEB 0x25 /* AGC lower limit */
113 #define REG_VPT 0x26 /* AGC/AEC fast mode op region */
114 #define REG_HSYST 0x30 /* HSYNC rising edge delay */
115 #define REG_HSYEN 0x31 /* HSYNC falling edge delay */
116 #define REG_HREF 0x32 /* HREF pieces */
117 #define REG_TSLB 0x3a /* lots of stuff */
118 #define TSLB_YLAST 0x04 /* UYVY or VYUY - see com13 */
119 #define REG_COM11 0x3b /* Control 11 */
120 #define COM11_NIGHT 0x80 /* NIght mode enable */
121 #define COM11_NMFR 0x60 /* Two bit NM frame rate */
122 #define COM11_HZAUTO 0x10 /* Auto detect 50/60 Hz */
123 #define COM11_50HZ 0x08 /* Manual 50Hz select */
124 #define COM11_EXP 0x02
125 #define REG_COM12 0x3c /* Control 12 */
126 #define COM12_HREF 0x80 /* HREF always */
127 #define REG_COM13 0x3d /* Control 13 */
128 #define COM13_GAMMA 0x80 /* Gamma enable */
129 #define COM13_UVSAT 0x40 /* UV saturation auto adjustment */
130 #define COM13_UVSWAP 0x01 /* V before U - w/TSLB */
131 #define REG_COM14 0x3e /* Control 14 */
132 #define COM14_DCWEN 0x10 /* DCW/PCLK-scale enable */
133 #define REG_EDGE 0x3f /* Edge enhancement factor */
134 #define REG_COM15 0x40 /* Control 15 */
135 #define COM15_R10F0 0x00 /* Data range 10 to F0 */
136 #define COM15_R01FE 0x80 /* 01 to FE */
137 #define COM15_R00FF 0xc0 /* 00 to FF */
138 #define COM15_RGB565 0x10 /* RGB565 output */
139 #define COM15_RGB555 0x30 /* RGB555 output */
140 #define REG_COM16 0x41 /* Control 16 */
141 #define COM16_AWBGAIN 0x08 /* AWB gain enable */
142 #define REG_COM17 0x42 /* Control 17 */
143 #define COM17_AECWIN 0xc0 /* AEC window - must match COM4 */
144 #define COM17_CBAR 0x08 /* DSP Color bar */
145
146 /*
147 * This matrix defines how the colors are generated, must be
148 * tweaked to adjust hue and saturation.
149 *
150 * Order: v-red, v-green, v-blue, u-red, u-green, u-blue
151 *
152 * They are nine-bit signed quantities, with the sign bit
153 * stored in 0x58. Sign for v-red is bit 0, and up from there.
154 */
155 #define REG_CMATRIX_BASE 0x4f
156 #define CMATRIX_LEN 6
157 #define REG_CMATRIX_SIGN 0x58
158
159
160 #define REG_BRIGHT 0x55 /* Brightness */
161 #define REG_CONTRAS 0x56 /* Contrast control */
162
163 #define REG_GFIX 0x69 /* Fix gain control */
164
165 #define REG_RGB444 0x8c /* RGB 444 control */
166 #define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */
167 #define R444_RGBX 0x01 /* Empty nibble at end */
168
169 #define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */
170 #define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */
171
172 #define REG_BD50MAX 0xa5 /* 50hz banding step limit */
173 #define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */
174 #define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */
175 #define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */
176 #define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */
177 #define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
178 #define REG_BD60MAX 0xab /* 60hz banding step limit */
179
180
181 /*
182 * Information we maintain about a known sensor.
183 */
184 struct ov7670_format_struct; /* coming later */
185 struct ov7670_info {
186 struct ov7670_format_struct *fmt; /* Current format */
187 unsigned char sat; /* Saturation value */
188 int hue; /* Hue value */
189 };
190
191
192
193
194 /*
195 * The default register settings, as obtained from OmniVision. There
196 * is really no making sense of most of these - lots of "reserved" values
197 * and such.
198 *
199 * These settings give VGA YUYV.
200 */
201
202 struct regval_list {
203 unsigned char reg_num;
204 unsigned char value;
205 };
206
207 static struct regval_list ov7670_default_regs[] = {
208 { REG_COM7, COM7_RESET },
209 /*
210 * Clock scale: 3 = 15fps
211 * 2 = 20fps
212 * 1 = 30fps
213 */
214 { REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */
215 { REG_TSLB, 0x04 }, /* OV */
216 { REG_COM7, 0 }, /* VGA */
217 /*
218 * Set the hardware window. These values from OV don't entirely
219 * make sense - hstop is less than hstart. But they work...
220 */
221 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
222 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
223 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },
224
225 { REG_COM3, 0 }, { REG_COM14, 0 },
226 /* Mystery scaling numbers */
227 { 0x70, 0x3a }, { 0x71, 0x35 },
228 { 0x72, 0x11 }, { 0x73, 0xf0 },
229 { 0xa2, 0x02 }, { REG_COM10, 0x0 },
230
231 /* Gamma curve values */
232 { 0x7a, 0x20 }, { 0x7b, 0x10 },
233 { 0x7c, 0x1e }, { 0x7d, 0x35 },
234 { 0x7e, 0x5a }, { 0x7f, 0x69 },
235 { 0x80, 0x76 }, { 0x81, 0x80 },
236 { 0x82, 0x88 }, { 0x83, 0x8f },
237 { 0x84, 0x96 }, { 0x85, 0xa3 },
238 { 0x86, 0xaf }, { 0x87, 0xc4 },
239 { 0x88, 0xd7 }, { 0x89, 0xe8 },
240
241 /* AGC and AEC parameters. Note we start by disabling those features,
242 then turn them only after tweaking the values. */
243 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
244 { REG_GAIN, 0 }, { REG_AECH, 0 },
245 { REG_COM4, 0x40 }, /* magic reserved bit */
246 { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
247 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
248 { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
249 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
250 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */
251 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
252 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
253 { REG_HAECC7, 0x94 },
254 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
255
256 /* Almost all of these are magic "reserved" values. */
257 { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
258 { 0x16, 0x02 }, { REG_MVFP, 0x07|MVFP_MIRROR },
259 { 0x21, 0x02 }, { 0x22, 0x91 },
260 { 0x29, 0x07 }, { 0x33, 0x0b },
261 { 0x35, 0x0b }, { 0x37, 0x1d },
262 { 0x38, 0x71 }, { 0x39, 0x2a },
263 { REG_COM12, 0x78 }, { 0x4d, 0x40 },
264 { 0x4e, 0x20 }, { REG_GFIX, 0 },
265 { 0x6b, 0x4a }, { 0x74, 0x10 },
266 { 0x8d, 0x4f }, { 0x8e, 0 },
267 { 0x8f, 0 }, { 0x90, 0 },
268 { 0x91, 0 }, { 0x96, 0 },
269 { 0x9a, 0 }, { 0xb0, 0x84 },
270 { 0xb1, 0x0c }, { 0xb2, 0x0e },
271 { 0xb3, 0x82 }, { 0xb8, 0x0a },
272
273 /* More reserved magic, some of which tweaks white balance */
274 { 0x43, 0x0a }, { 0x44, 0xf0 },
275 { 0x45, 0x34 }, { 0x46, 0x58 },
276 { 0x47, 0x28 }, { 0x48, 0x3a },
277 { 0x59, 0x88 }, { 0x5a, 0x88 },
278 { 0x5b, 0x44 }, { 0x5c, 0x67 },
279 { 0x5d, 0x49 }, { 0x5e, 0x0e },
280 { 0x6c, 0x0a }, { 0x6d, 0x55 },
281 { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */
282 { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
283 { REG_RED, 0x60 },
284 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
285
286 /* Matrix coefficients */
287 { 0x4f, 0x80 }, { 0x50, 0x80 },
288 { 0x51, 0 }, { 0x52, 0x22 },
289 { 0x53, 0x5e }, { 0x54, 0x80 },
290 { 0x58, 0x9e },
291
292 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
293 { 0x75, 0x05 }, { 0x76, 0xe1 },
294 { 0x4c, 0 }, { 0x77, 0x01 },
295 { REG_COM13, 0xc3 }, { 0x4b, 0x09 },
296 { 0xc9, 0x60 }, { REG_COM16, 0x38 },
297 { 0x56, 0x40 },
298
299 { 0x34, 0x11 }, { REG_COM11, COM11_EXP|COM11_HZAUTO },
300 { 0xa4, 0x88 }, { 0x96, 0 },
301 { 0x97, 0x30 }, { 0x98, 0x20 },
302 { 0x99, 0x30 }, { 0x9a, 0x84 },
303 { 0x9b, 0x29 }, { 0x9c, 0x03 },
304 { 0x9d, 0x4c }, { 0x9e, 0x3f },
305 { 0x78, 0x04 },
306
307 /* Extra-weird stuff. Some sort of multiplexor register */
308 { 0x79, 0x01 }, { 0xc8, 0xf0 },
309 { 0x79, 0x0f }, { 0xc8, 0x00 },
310 { 0x79, 0x10 }, { 0xc8, 0x7e },
311 { 0x79, 0x0a }, { 0xc8, 0x80 },
312 { 0x79, 0x0b }, { 0xc8, 0x01 },
313 { 0x79, 0x0c }, { 0xc8, 0x0f },
314 { 0x79, 0x0d }, { 0xc8, 0x20 },
315 { 0x79, 0x09 }, { 0xc8, 0x80 },
316 { 0x79, 0x02 }, { 0xc8, 0xc0 },
317 { 0x79, 0x03 }, { 0xc8, 0x40 },
318 { 0x79, 0x05 }, { 0xc8, 0x30 },
319 { 0x79, 0x26 },
320
321 { 0xff, 0xff }, /* END MARKER */
322 };
323
324
325 /*
326 * Here we'll try to encapsulate the changes for just the output
327 * video format.
328 *
329 * RGB656 and YUV422 come from OV; RGB444 is homebrewed.
330 *
331 * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why.
332 */
333
334
335 static struct regval_list ov7670_fmt_yuv422[] = {
336 { REG_COM7, 0x0 }, /* Selects YUV mode */
337 { REG_RGB444, 0 }, /* No RGB444 please */
338 { REG_COM1, 0 },
339 { REG_COM15, COM15_R00FF },
340 { REG_COM9, 0x18 }, /* 4x gain ceiling; 0x8 is reserved bit */
341 { 0x4f, 0x80 }, /* "matrix coefficient 1" */
342 { 0x50, 0x80 }, /* "matrix coefficient 2" */
343 { 0x51, 0 }, /* vb */
344 { 0x52, 0x22 }, /* "matrix coefficient 4" */
345 { 0x53, 0x5e }, /* "matrix coefficient 5" */
346 { 0x54, 0x80 }, /* "matrix coefficient 6" */
347 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
348 { 0xff, 0xff },
349 };
350
351 static struct regval_list ov7670_fmt_rgb565[] = {
352 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
353 { REG_RGB444, 0 }, /* No RGB444 please */
354 { REG_COM1, 0x0 },
355 { REG_COM15, COM15_RGB565 },
356 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
357 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
358 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
359 { 0x51, 0 }, /* vb */
360 { 0x52, 0x3d }, /* "matrix coefficient 4" */
361 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
362 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
363 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
364 { 0xff, 0xff },
365 };
366
367 static struct regval_list ov7670_fmt_rgb444[] = {
368 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
369 { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */
370 { REG_COM1, 0x40 }, /* Magic reserved bit */
371 { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */
372 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
373 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
374 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
375 { 0x51, 0 }, /* vb */
376 { 0x52, 0x3d }, /* "matrix coefficient 4" */
377 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
378 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
379 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */
380 { 0xff, 0xff },
381 };
382
383
384
385
386 /*
387 * Low-level register I/O.
388 */
389
390 static int ov7670_read(struct i2c_client *c, unsigned char reg,
391 unsigned char *value)
392 {
393 int ret;
394
395 ret = i2c_smbus_read_byte_data(c, reg);
396 if (ret >= 0)
397 *value = (unsigned char) ret;
398 return ret;
399 }
400
401
402 static int ov7670_write(struct i2c_client *c, unsigned char reg,
403 unsigned char value)
404 {
405 return i2c_smbus_write_byte_data(c, reg, value);
406 }
407
408
409 /*
410 * Write a list of register settings; ff/ff stops the process.
411 */
412 static int ov7670_write_array(struct i2c_client *c, struct regval_list *vals)
413 {
414 while (vals->reg_num != 0xff || vals->value != 0xff) {
415 int ret = ov7670_write(c, vals->reg_num, vals->value);
416 if (ret < 0)
417 return ret;
418 vals++;
419 }
420 return 0;
421 }
422
423
424 /*
425 * Stuff that knows about the sensor.
426 */
427 static void ov7670_reset(struct i2c_client *client)
428 {
429 ov7670_write(client, REG_COM7, COM7_RESET);
430 msleep(1);
431 }
432
433
434 static int ov7670_init(struct i2c_client *client)
435 {
436 return ov7670_write_array(client, ov7670_default_regs);
437 }
438
439
440
441 static int ov7670_detect(struct i2c_client *client)
442 {
443 unsigned char v;
444 int ret;
445
446 ret = ov7670_init(client);
447 if (ret < 0)
448 return ret;
449 ret = ov7670_read(client, REG_MIDH, &v);
450 if (ret < 0)
451 return ret;
452 if (v != 0x7f) /* OV manuf. id. */
453 return -ENODEV;
454 ret = ov7670_read(client, REG_MIDL, &v);
455 if (ret < 0)
456 return ret;
457 if (v != 0xa2)
458 return -ENODEV;
459 /*
460 * OK, we know we have an OmniVision chip...but which one?
461 */
462 ret = ov7670_read(client, REG_PID, &v);
463 if (ret < 0)
464 return ret;
465 if (v != 0x76) /* PID + VER = 0x76 / 0x73 */
466 return -ENODEV;
467 ret = ov7670_read(client, REG_VER, &v);
468 if (ret < 0)
469 return ret;
470 if (v != 0x73) /* PID + VER = 0x76 / 0x73 */
471 return -ENODEV;
472 return 0;
473 }
474
475
476 /*
477 * Store information about the video data format. The color matrix
478 * is deeply tied into the format, so keep the relevant values here.
479 * The magic matrix nubmers come from OmniVision.
480 */
481 static struct ov7670_format_struct {
482 __u8 *desc;
483 __u32 pixelformat;
484 struct regval_list *regs;
485 int cmatrix[CMATRIX_LEN];
486 } ov7670_formats[] = {
487 {
488 .desc = "YUYV 4:2:2",
489 .pixelformat = V4L2_PIX_FMT_YUYV,
490 .regs = ov7670_fmt_yuv422,
491 .cmatrix = { 128, -128, 0, -34, -94, 128 },
492 },
493 {
494 .desc = "RGB 444",
495 .pixelformat = V4L2_PIX_FMT_RGB444,
496 .regs = ov7670_fmt_rgb444,
497 .cmatrix = { 179, -179, 0, -61, -176, 228 },
498 },
499 {
500 .desc = "RGB 565",
501 .pixelformat = V4L2_PIX_FMT_RGB565,
502 .regs = ov7670_fmt_rgb565,
503 .cmatrix = { 179, -179, 0, -61, -176, 228 },
504 },
505 };
506 #define N_OV7670_FMTS (sizeof(ov7670_formats)/sizeof(ov7670_formats[0]))
507
508 /*
509 * All formats we support are 2 bytes/pixel.
510 */
511 #define BYTES_PER_PIXEL 2
512
513 /*
514 * Then there is the issue of window sizes. Try to capture the info here.
515 */
516
517 /*
518 * QCIF mode is done (by OV) in a very strange way - it actually looks like
519 * VGA with weird scaling options - they do *not* use the canned QCIF mode
520 * which is allegedly provided by the sensor. So here's the weird register
521 * settings.
522 */
523 static struct regval_list ov7670_qcif_regs[] = {
524 { REG_COM3, COM3_SCALEEN|COM3_DCWEN },
525 { REG_COM3, COM3_DCWEN },
526 { REG_COM14, COM14_DCWEN | 0x01},
527 { 0x73, 0xf1 },
528 { 0xa2, 0x52 },
529 { 0x7b, 0x1c },
530 { 0x7c, 0x28 },
531 { 0x7d, 0x3c },
532 { 0x7f, 0x69 },
533 { REG_COM9, 0x38 },
534 { 0xa1, 0x0b },
535 { 0x74, 0x19 },
536 { 0x9a, 0x80 },
537 { 0x43, 0x14 },
538 { REG_COM13, 0xc0 },
539 { 0xff, 0xff },
540 };
541
542 static struct ov7670_win_size {
543 int width;
544 int height;
545 unsigned char com7_bit;
546 int hstart; /* Start/stop values for the camera. Note */
547 int hstop; /* that they do not always make complete */
548 int vstart; /* sense to humans, but evidently the sensor */
549 int vstop; /* will do the right thing... */
550 struct regval_list *regs; /* Regs to tweak */
551 /* h/vref stuff */
552 } ov7670_win_sizes[] = {
553 /* VGA */
554 {
555 .width = VGA_WIDTH,
556 .height = VGA_HEIGHT,
557 .com7_bit = COM7_FMT_VGA,
558 .hstart = 158, /* These values from */
559 .hstop = 14, /* Omnivision */
560 .vstart = 10,
561 .vstop = 490,
562 .regs = NULL,
563 },
564 /* CIF */
565 {
566 .width = CIF_WIDTH,
567 .height = CIF_HEIGHT,
568 .com7_bit = COM7_FMT_CIF,
569 .hstart = 170, /* Empirically determined */
570 .hstop = 90,
571 .vstart = 14,
572 .vstop = 494,
573 .regs = NULL,
574 },
575 /* QVGA */
576 {
577 .width = QVGA_WIDTH,
578 .height = QVGA_HEIGHT,
579 .com7_bit = COM7_FMT_QVGA,
580 .hstart = 164, /* Empirically determined */
581 .hstop = 20,
582 .vstart = 14,
583 .vstop = 494,
584 .regs = NULL,
585 },
586 /* QCIF */
587 {
588 .width = QCIF_WIDTH,
589 .height = QCIF_HEIGHT,
590 .com7_bit = COM7_FMT_VGA, /* see comment above */
591 .hstart = 456, /* Empirically determined */
592 .hstop = 24,
593 .vstart = 14,
594 .vstop = 494,
595 .regs = ov7670_qcif_regs,
596 },
597 };
598
599 #define N_WIN_SIZES (sizeof(ov7670_win_sizes)/sizeof(ov7670_win_sizes[0]))
600
601
602 /*
603 * Store a set of start/stop values into the camera.
604 */
605 static int ov7670_set_hw(struct i2c_client *client, int hstart, int hstop,
606 int vstart, int vstop)
607 {
608 int ret;
609 unsigned char v;
610 /*
611 * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of
612 * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is
613 * a mystery "edge offset" value in the top two bits of href.
614 */
615 ret = ov7670_write(client, REG_HSTART, (hstart >> 3) & 0xff);
616 ret += ov7670_write(client, REG_HSTOP, (hstop >> 3) & 0xff);
617 ret += ov7670_read(client, REG_HREF, &v);
618 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
619 msleep(10);
620 ret += ov7670_write(client, REG_HREF, v);
621 /*
622 * Vertical: similar arrangement, but only 10 bits.
623 */
624 ret += ov7670_write(client, REG_VSTART, (vstart >> 2) & 0xff);
625 ret += ov7670_write(client, REG_VSTOP, (vstop >> 2) & 0xff);
626 ret += ov7670_read(client, REG_VREF, &v);
627 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
628 msleep(10);
629 ret += ov7670_write(client, REG_VREF, v);
630 return ret;
631 }
632
633
634 static int ov7670_enum_fmt(struct i2c_client *c, struct v4l2_fmtdesc *fmt)
635 {
636 struct ov7670_format_struct *ofmt;
637
638 if (fmt->index >= N_OV7670_FMTS)
639 return -EINVAL;
640
641 ofmt = ov7670_formats + fmt->index;
642 fmt->flags = 0;
643 strcpy(fmt->description, ofmt->desc);
644 fmt->pixelformat = ofmt->pixelformat;
645 return 0;
646 }
647
648
649 static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt,
650 struct ov7670_format_struct **ret_fmt,
651 struct ov7670_win_size **ret_wsize)
652 {
653 int index;
654 struct ov7670_win_size *wsize;
655 struct v4l2_pix_format *pix = &fmt->fmt.pix;
656
657 for (index = 0; index < N_OV7670_FMTS; index++)
658 if (ov7670_formats[index].pixelformat == pix->pixelformat)
659 break;
660 if (index >= N_OV7670_FMTS)
661 return -EINVAL;
662 if (ret_fmt != NULL)
663 *ret_fmt = ov7670_formats + index;
664 /*
665 * Fields: the OV devices claim to be progressive.
666 */
667 if (pix->field == V4L2_FIELD_ANY)
668 pix->field = V4L2_FIELD_NONE;
669 else if (pix->field != V4L2_FIELD_NONE)
670 return -EINVAL;
671 /*
672 * Round requested image size down to the nearest
673 * we support, but not below the smallest.
674 */
675 for (wsize = ov7670_win_sizes; wsize < ov7670_win_sizes + N_WIN_SIZES;
676 wsize++)
677 if (pix->width >= wsize->width && pix->height >= wsize->height)
678 break;
679 if (wsize >= ov7670_win_sizes + N_WIN_SIZES)
680 wsize--; /* Take the smallest one */
681 if (ret_wsize != NULL)
682 *ret_wsize = wsize;
683 /*
684 * Note the size we'll actually handle.
685 */
686 pix->width = wsize->width;
687 pix->height = wsize->height;
688 pix->bytesperline = pix->width*BYTES_PER_PIXEL;
689 pix->sizeimage = pix->height*pix->bytesperline;
690 return 0;
691 }
692
693 /*
694 * Set a format.
695 */
696 static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt)
697 {
698 int ret;
699 struct ov7670_format_struct *ovfmt;
700 struct ov7670_win_size *wsize;
701 struct ov7670_info *info = i2c_get_clientdata(c);
702 unsigned char com7;
703
704 ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize);
705 if (ret)
706 return ret;
707 /*
708 * COM7 is a pain in the ass, it doesn't like to be read then
709 * quickly written afterward. But we have everything we need
710 * to set it absolutely here, as long as the format-specific
711 * register sets list it first.
712 */
713 com7 = ovfmt->regs[0].value;
714 com7 |= wsize->com7_bit;
715 ov7670_write(c, REG_COM7, com7);
716 /*
717 * Now write the rest of the array. Also store start/stops
718 */
719 ov7670_write_array(c, ovfmt->regs + 1);
720 ov7670_set_hw(c, wsize->hstart, wsize->hstop, wsize->vstart,
721 wsize->vstop);
722 ret = 0;
723 if (wsize->regs)
724 ret = ov7670_write_array(c, wsize->regs);
725 info->fmt = ovfmt;
726 return 0;
727 }
728
729 /*
730 * Implement G/S_PARM. There is a "high quality" mode we could try
731 * to do someday; for now, we just do the frame rate tweak.
732 */
733 static int ov7670_g_parm(struct i2c_client *c, struct v4l2_streamparm *parms)
734 {
735 struct v4l2_captureparm *cp = &parms->parm.capture;
736 unsigned char clkrc;
737 int ret;
738
739 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
740 return -EINVAL;
741 ret = ov7670_read(c, REG_CLKRC, &clkrc);
742 if (ret < 0)
743 return ret;
744 memset(cp, 0, sizeof(struct v4l2_captureparm));
745 cp->capability = V4L2_CAP_TIMEPERFRAME;
746 cp->timeperframe.numerator = 1;
747 cp->timeperframe.denominator = OV7670_FRAME_RATE;
748 if ((clkrc & CLK_EXT) == 0 && (clkrc & CLK_SCALE) > 1)
749 cp->timeperframe.denominator /= (clkrc & CLK_SCALE);
750 return 0;
751 }
752
753 static int ov7670_s_parm(struct i2c_client *c, struct v4l2_streamparm *parms)
754 {
755 struct v4l2_captureparm *cp = &parms->parm.capture;
756 struct v4l2_fract *tpf = &cp->timeperframe;
757 unsigned char clkrc;
758 int ret, div;
759
760 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
761 return -EINVAL;
762 if (cp->extendedmode != 0)
763 return -EINVAL;
764 /*
765 * CLKRC has a reserved bit, so let's preserve it.
766 */
767 ret = ov7670_read(c, REG_CLKRC, &clkrc);
768 if (ret < 0)
769 return ret;
770 if (tpf->numerator == 0 || tpf->denominator == 0)
771 div = 1; /* Reset to full rate */
772 else
773 div = (tpf->numerator*OV7670_FRAME_RATE)/tpf->denominator;
774 if (div == 0)
775 div = 1;
776 else if (div > CLK_SCALE)
777 div = CLK_SCALE;
778 clkrc = (clkrc & 0x80) | div;
779 tpf->numerator = 1;
780 tpf->denominator = OV7670_FRAME_RATE/div;
781 return ov7670_write(c, REG_CLKRC, clkrc);
782 }
783
784
785
786 /*
787 * Code for dealing with controls.
788 */
789
790
791
792
793
794 static int ov7670_store_cmatrix(struct i2c_client *client,
795 int matrix[CMATRIX_LEN])
796 {
797 int i, ret;
798 unsigned char signbits;
799
800 /*
801 * Weird crap seems to exist in the upper part of
802 * the sign bits register, so let's preserve it.
803 */
804 ret = ov7670_read(client, REG_CMATRIX_SIGN, &signbits);
805 signbits &= 0xc0;
806
807 for (i = 0; i < CMATRIX_LEN; i++) {
808 unsigned char raw;
809
810 if (matrix[i] < 0) {
811 signbits |= (1 << i);
812 if (matrix[i] < -255)
813 raw = 0xff;
814 else
815 raw = (-1 * matrix[i]) & 0xff;
816 }
817 else {
818 if (matrix[i] > 255)
819 raw = 0xff;
820 else
821 raw = matrix[i] & 0xff;
822 }
823 ret += ov7670_write(client, REG_CMATRIX_BASE + i, raw);
824 }
825 ret += ov7670_write(client, REG_CMATRIX_SIGN, signbits);
826 return ret;
827 }
828
829
830 /*
831 * Hue also requires messing with the color matrix. It also requires
832 * trig functions, which tend not to be well supported in the kernel.
833 * So here is a simple table of sine values, 0-90 degrees, in steps
834 * of five degrees. Values are multiplied by 1000.
835 *
836 * The following naive approximate trig functions require an argument
837 * carefully limited to -180 <= theta <= 180.
838 */
839 #define SIN_STEP 5
840 static const int ov7670_sin_table[] = {
841 0, 87, 173, 258, 342, 422,
842 499, 573, 642, 707, 766, 819,
843 866, 906, 939, 965, 984, 996,
844 1000
845 };
846
847 static int ov7670_sine(int theta)
848 {
849 int chs = 1;
850 int sine;
851
852 if (theta < 0) {
853 theta = -theta;
854 chs = -1;
855 }
856 if (theta <= 90)
857 sine = ov7670_sin_table[theta/SIN_STEP];
858 else {
859 theta -= 90;
860 sine = 1000 - ov7670_sin_table[theta/SIN_STEP];
861 }
862 return sine*chs;
863 }
864
865 static int ov7670_cosine(int theta)
866 {
867 theta = 90 - theta;
868 if (theta > 180)
869 theta -= 360;
870 else if (theta < -180)
871 theta += 360;
872 return ov7670_sine(theta);
873 }
874
875
876
877
878 static void ov7670_calc_cmatrix(struct ov7670_info *info,
879 int matrix[CMATRIX_LEN])
880 {
881 int i;
882 /*
883 * Apply the current saturation setting first.
884 */
885 for (i = 0; i < CMATRIX_LEN; i++)
886 matrix[i] = (info->fmt->cmatrix[i]*info->sat) >> 7;
887 /*
888 * Then, if need be, rotate the hue value.
889 */
890 if (info->hue != 0) {
891 int sinth, costh, tmpmatrix[CMATRIX_LEN];
892
893 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
894 sinth = ov7670_sine(info->hue);
895 costh = ov7670_cosine(info->hue);
896
897 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000;
898 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000;
899 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000;
900 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000;
901 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000;
902 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000;
903 }
904 }
905
906
907
908 static int ov7670_t_sat(struct i2c_client *client, int value)
909 {
910 struct ov7670_info *info = i2c_get_clientdata(client);
911 int matrix[CMATRIX_LEN];
912 int ret;
913
914 info->sat = value;
915 ov7670_calc_cmatrix(info, matrix);
916 ret = ov7670_store_cmatrix(client, matrix);
917 return ret;
918 }
919
920 static int ov7670_q_sat(struct i2c_client *client, __s32 *value)
921 {
922 struct ov7670_info *info = i2c_get_clientdata(client);
923
924 *value = info->sat;
925 return 0;
926 }
927
928 static int ov7670_t_hue(struct i2c_client *client, int value)
929 {
930 struct ov7670_info *info = i2c_get_clientdata(client);
931 int matrix[CMATRIX_LEN];
932 int ret;
933
934 if (value < -180 || value > 180)
935 return -EINVAL;
936 info->hue = value;
937 ov7670_calc_cmatrix(info, matrix);
938 ret = ov7670_store_cmatrix(client, matrix);
939 return ret;
940 }
941
942
943 static int ov7670_q_hue(struct i2c_client *client, __s32 *value)
944 {
945 struct ov7670_info *info = i2c_get_clientdata(client);
946
947 *value = info->hue;
948 return 0;
949 }
950
951
952 /*
953 * Some weird registers seem to store values in a sign/magnitude format!
954 */
955 static unsigned char ov7670_sm_to_abs(unsigned char v)
956 {
957 if ((v & 0x80) == 0)
958 return v + 128;
959 else
960 return 128 - (v & 0x7f);
961 }
962
963
964 static unsigned char ov7670_abs_to_sm(unsigned char v)
965 {
966 if (v > 127)
967 return v & 0x7f;
968 else
969 return (128 - v) | 0x80;
970 }
971
972 static int ov7670_t_brightness(struct i2c_client *client, int value)
973 {
974 unsigned char com8, v;
975 int ret;
976
977 ov7670_read(client, REG_COM8, &com8);
978 com8 &= ~COM8_AEC;
979 ov7670_write(client, REG_COM8, com8);
980 v = ov7670_abs_to_sm(value);
981 ret = ov7670_write(client, REG_BRIGHT, v);
982 return ret;
983 }
984
985 static int ov7670_q_brightness(struct i2c_client *client, __s32 *value)
986 {
987 unsigned char v;
988 int ret = ov7670_read(client, REG_BRIGHT, &v);
989
990 *value = ov7670_sm_to_abs(v);
991 return ret;
992 }
993
994 static int ov7670_t_contrast(struct i2c_client *client, int value)
995 {
996 return ov7670_write(client, REG_CONTRAS, (unsigned char) value);
997 }
998
999 static int ov7670_q_contrast(struct i2c_client *client, __s32 *value)
1000 {
1001 unsigned char v;
1002 int ret = ov7670_read(client, REG_CONTRAS, &v);
1003
1004 *value = v;
1005 return ret;
1006 }
1007
1008 static int ov7670_q_hflip(struct i2c_client *client, __s32 *value)
1009 {
1010 int ret;
1011 unsigned char v;
1012
1013 ret = ov7670_read(client, REG_MVFP, &v);
1014 *value = (v & MVFP_MIRROR) == MVFP_MIRROR;
1015 return ret;
1016 }
1017
1018
1019 static int ov7670_t_hflip(struct i2c_client *client, int value)
1020 {
1021 unsigned char v;
1022 int ret;
1023
1024 ret = ov7670_read(client, REG_MVFP, &v);
1025 if (value)
1026 v |= MVFP_MIRROR;
1027 else
1028 v &= ~MVFP_MIRROR;
1029 msleep(10); /* FIXME */
1030 ret += ov7670_write(client, REG_MVFP, v);
1031 return ret;
1032 }
1033
1034
1035
1036 static int ov7670_q_vflip(struct i2c_client *client, __s32 *value)
1037 {
1038 int ret;
1039 unsigned char v;
1040
1041 ret = ov7670_read(client, REG_MVFP, &v);
1042 *value = (v & MVFP_FLIP) == MVFP_FLIP;
1043 return ret;
1044 }
1045
1046
1047 static int ov7670_t_vflip(struct i2c_client *client, int value)
1048 {
1049 unsigned char v;
1050 int ret;
1051
1052 ret = ov7670_read(client, REG_MVFP, &v);
1053 if (value)
1054 v |= MVFP_FLIP;
1055 else
1056 v &= ~MVFP_FLIP;
1057 msleep(10); /* FIXME */
1058 ret += ov7670_write(client, REG_MVFP, v);
1059 return ret;
1060 }
1061
1062
1063 static struct ov7670_control {
1064 struct v4l2_queryctrl qc;
1065 int (*query)(struct i2c_client *c, __s32 *value);
1066 int (*tweak)(struct i2c_client *c, int value);
1067 } ov7670_controls[] =
1068 {
1069 {
1070 .qc = {
1071 .id = V4L2_CID_BRIGHTNESS,
1072 .type = V4L2_CTRL_TYPE_INTEGER,
1073 .name = "Brightness",
1074 .minimum = 0,
1075 .maximum = 255,
1076 .step = 1,
1077 .default_value = 0x80,
1078 .flags = V4L2_CTRL_FLAG_SLIDER
1079 },
1080 .tweak = ov7670_t_brightness,
1081 .query = ov7670_q_brightness,
1082 },
1083 {
1084 .qc = {
1085 .id = V4L2_CID_CONTRAST,
1086 .type = V4L2_CTRL_TYPE_INTEGER,
1087 .name = "Contrast",
1088 .minimum = 0,
1089 .maximum = 127,
1090 .step = 1,
1091 .default_value = 0x40, /* XXX ov7670 spec */
1092 .flags = V4L2_CTRL_FLAG_SLIDER
1093 },
1094 .tweak = ov7670_t_contrast,
1095 .query = ov7670_q_contrast,
1096 },
1097 {
1098 .qc = {
1099 .id = V4L2_CID_SATURATION,
1100 .type = V4L2_CTRL_TYPE_INTEGER,
1101 .name = "Saturation",
1102 .minimum = 0,
1103 .maximum = 256,
1104 .step = 1,
1105 .default_value = 0x80,
1106 .flags = V4L2_CTRL_FLAG_SLIDER
1107 },
1108 .tweak = ov7670_t_sat,
1109 .query = ov7670_q_sat,
1110 },
1111 {
1112 .qc = {
1113 .id = V4L2_CID_HUE,
1114 .type = V4L2_CTRL_TYPE_INTEGER,
1115 .name = "HUE",
1116 .minimum = -180,
1117 .maximum = 180,
1118 .step = 5,
1119 .default_value = 0,
1120 .flags = V4L2_CTRL_FLAG_SLIDER
1121 },
1122 .tweak = ov7670_t_hue,
1123 .query = ov7670_q_hue,
1124 },
1125 {
1126 .qc = {
1127 .id = V4L2_CID_VFLIP,
1128 .type = V4L2_CTRL_TYPE_BOOLEAN,
1129 .name = "Vertical flip",
1130 .minimum = 0,
1131 .maximum = 1,
1132 .step = 1,
1133 .default_value = 0,
1134 },
1135 .tweak = ov7670_t_vflip,
1136 .query = ov7670_q_vflip,
1137 },
1138 {
1139 .qc = {
1140 .id = V4L2_CID_HFLIP,
1141 .type = V4L2_CTRL_TYPE_BOOLEAN,
1142 .name = "Horizontal mirror",
1143 .minimum = 0,
1144 .maximum = 1,
1145 .step = 1,
1146 .default_value = 0,
1147 },
1148 .tweak = ov7670_t_hflip,
1149 .query = ov7670_q_hflip,
1150 },
1151 };
1152 #define N_CONTROLS (sizeof(ov7670_controls)/sizeof(ov7670_controls[0]))
1153
1154 static struct ov7670_control *ov7670_find_control(__u32 id)
1155 {
1156 int i;
1157
1158 for (i = 0; i < N_CONTROLS; i++)
1159 if (ov7670_controls[i].qc.id == id)
1160 return ov7670_controls + i;
1161 return NULL;
1162 }
1163
1164
1165 static int ov7670_queryctrl(struct i2c_client *client,
1166 struct v4l2_queryctrl *qc)
1167 {
1168 struct ov7670_control *ctrl = ov7670_find_control(qc->id);
1169
1170 if (ctrl == NULL)
1171 return -EINVAL;
1172 *qc = ctrl->qc;
1173 return 0;
1174 }
1175
1176 static int ov7670_g_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1177 {
1178 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
1179 int ret;
1180
1181 if (octrl == NULL)
1182 return -EINVAL;
1183 ret = octrl->query(client, &ctrl->value);
1184 if (ret >= 0)
1185 return 0;
1186 return ret;
1187 }
1188
1189 static int ov7670_s_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1190 {
1191 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
1192 int ret;
1193
1194 if (octrl == NULL)
1195 return -EINVAL;
1196 ret = octrl->tweak(client, ctrl->value);
1197 if (ret >= 0)
1198 return 0;
1199 return ret;
1200 }
1201
1202
1203
1204
1205
1206
1207 /*
1208 * Basic i2c stuff.
1209 */
1210 static struct i2c_driver ov7670_driver;
1211
1212 static int ov7670_attach(struct i2c_adapter *adapter)
1213 {
1214 int ret;
1215 struct i2c_client *client;
1216 struct ov7670_info *info;
1217
1218 /*
1219 * For now: only deal with adapters we recognize.
1220 */
1221 if (adapter->id != I2C_HW_SMBUS_CAFE)
1222 return -ENODEV;
1223
1224 client = kzalloc(sizeof (struct i2c_client), GFP_KERNEL);
1225 if (! client)
1226 return -ENOMEM;
1227 client->adapter = adapter;
1228 client->addr = OV7670_I2C_ADDR;
1229 client->driver = &ov7670_driver,
1230 strcpy(client->name, "OV7670");
1231 /*
1232 * Set up our info structure.
1233 */
1234 info = kzalloc(sizeof (struct ov7670_info), GFP_KERNEL);
1235 if (! info) {
1236 ret = -ENOMEM;
1237 goto out_free;
1238 }
1239 info->fmt = &ov7670_formats[0];
1240 info->sat = 128; /* Review this */
1241 i2c_set_clientdata(client, info);
1242
1243 /*
1244 * Make sure it's an ov7670
1245 */
1246 ret = ov7670_detect(client);
1247 if (ret)
1248 goto out_free_info;
1249 i2c_attach_client(client);
1250 return 0;
1251
1252 out_free_info:
1253 kfree(info);
1254 out_free:
1255 kfree(client);
1256 return ret;
1257 }
1258
1259
1260 static int ov7670_detach(struct i2c_client *client)
1261 {
1262 i2c_detach_client(client);
1263 kfree(i2c_get_clientdata(client));
1264 kfree(client);
1265 return 0;
1266 }
1267
1268
1269 static int ov7670_command(struct i2c_client *client, unsigned int cmd,
1270 void *arg)
1271 {
1272 switch (cmd) {
1273 case VIDIOC_INT_G_CHIP_IDENT:
1274 * (enum v4l2_chip_ident *) arg = V4L2_IDENT_OV7670;
1275 return 0;
1276
1277 case VIDIOC_INT_RESET:
1278 ov7670_reset(client);
1279 return 0;
1280
1281 case VIDIOC_INT_INIT:
1282 return ov7670_init(client);
1283
1284 case VIDIOC_ENUM_FMT:
1285 return ov7670_enum_fmt(client, (struct v4l2_fmtdesc *) arg);
1286 case VIDIOC_TRY_FMT:
1287 return ov7670_try_fmt(client, (struct v4l2_format *) arg, NULL, NULL);
1288 case VIDIOC_S_FMT:
1289 return ov7670_s_fmt(client, (struct v4l2_format *) arg);
1290 case VIDIOC_QUERYCTRL:
1291 return ov7670_queryctrl(client, (struct v4l2_queryctrl *) arg);
1292 case VIDIOC_S_CTRL:
1293 return ov7670_s_ctrl(client, (struct v4l2_control *) arg);
1294 case VIDIOC_G_CTRL:
1295 return ov7670_g_ctrl(client, (struct v4l2_control *) arg);
1296 case VIDIOC_S_PARM:
1297 return ov7670_s_parm(client, (struct v4l2_streamparm *) arg);
1298 case VIDIOC_G_PARM:
1299 return ov7670_g_parm(client, (struct v4l2_streamparm *) arg);
1300 }
1301 return -EINVAL;
1302 }
1303
1304
1305
1306 static struct i2c_driver ov7670_driver = {
1307 .driver = {
1308 .name = "ov7670",
1309 },
1310 .id = I2C_DRIVERID_OV7670,
1311 .class = I2C_CLASS_CAM_DIGITAL,
1312 .attach_adapter = ov7670_attach,
1313 .detach_client = ov7670_detach,
1314 .command = ov7670_command,
1315 };
1316
1317
1318 /*
1319 * Module initialization
1320 */
1321 static int __init ov7670_mod_init(void)
1322 {
1323 printk(KERN_NOTICE "OmniVision ov7670 sensor driver, at your service\n");
1324 return i2c_add_driver(&ov7670_driver);
1325 }
1326
1327 static void __exit ov7670_mod_exit(void)
1328 {
1329 i2c_del_driver(&ov7670_driver);
1330 }
1331
1332 module_init(ov7670_mod_init);
1333 module_exit(ov7670_mod_exit);
kernel source for telekom puls (alcatel/mediatek)