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Merge git://git.kvack.org/~bcrl/aio-next
[deliverable/linux.git] / drivers / media / i2c / 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 * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
9 *
10 * This file may be distributed under the terms of the GNU General
11 * Public License, version 2.
12 */
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/i2c.h>
17 #include <linux/delay.h>
18 #include <linux/videodev2.h>
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-ctrls.h>
21 #include <media/v4l2-mediabus.h>
22 #include <media/ov7670.h>
23
24 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
25 MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
26 MODULE_LICENSE("GPL");
27
28 static bool debug;
29 module_param(debug, bool, 0644);
30 MODULE_PARM_DESC(debug, "Debug level (0-1)");
31
32 /*
33 * Basic window sizes. These probably belong somewhere more globally
34 * useful.
35 */
36 #define VGA_WIDTH 640
37 #define VGA_HEIGHT 480
38 #define QVGA_WIDTH 320
39 #define QVGA_HEIGHT 240
40 #define CIF_WIDTH 352
41 #define CIF_HEIGHT 288
42 #define QCIF_WIDTH 176
43 #define QCIF_HEIGHT 144
44
45 /*
46 * The 7670 sits on i2c with ID 0x42
47 */
48 #define OV7670_I2C_ADDR 0x42
49
50 #define PLL_FACTOR 4
51
52 /* Registers */
53 #define REG_GAIN 0x00 /* Gain lower 8 bits (rest in vref) */
54 #define REG_BLUE 0x01 /* blue gain */
55 #define REG_RED 0x02 /* red gain */
56 #define REG_VREF 0x03 /* Pieces of GAIN, VSTART, VSTOP */
57 #define REG_COM1 0x04 /* Control 1 */
58 #define COM1_CCIR656 0x40 /* CCIR656 enable */
59 #define REG_BAVE 0x05 /* U/B Average level */
60 #define REG_GbAVE 0x06 /* Y/Gb Average level */
61 #define REG_AECHH 0x07 /* AEC MS 5 bits */
62 #define REG_RAVE 0x08 /* V/R Average level */
63 #define REG_COM2 0x09 /* Control 2 */
64 #define COM2_SSLEEP 0x10 /* Soft sleep mode */
65 #define REG_PID 0x0a /* Product ID MSB */
66 #define REG_VER 0x0b /* Product ID LSB */
67 #define REG_COM3 0x0c /* Control 3 */
68 #define COM3_SWAP 0x40 /* Byte swap */
69 #define COM3_SCALEEN 0x08 /* Enable scaling */
70 #define COM3_DCWEN 0x04 /* Enable downsamp/crop/window */
71 #define REG_COM4 0x0d /* Control 4 */
72 #define REG_COM5 0x0e /* All "reserved" */
73 #define REG_COM6 0x0f /* Control 6 */
74 #define REG_AECH 0x10 /* More bits of AEC value */
75 #define REG_CLKRC 0x11 /* Clocl control */
76 #define CLK_EXT 0x40 /* Use external clock directly */
77 #define CLK_SCALE 0x3f /* Mask for internal clock scale */
78 #define REG_COM7 0x12 /* Control 7 */
79 #define COM7_RESET 0x80 /* Register reset */
80 #define COM7_FMT_MASK 0x38
81 #define COM7_FMT_VGA 0x00
82 #define COM7_FMT_CIF 0x20 /* CIF format */
83 #define COM7_FMT_QVGA 0x10 /* QVGA format */
84 #define COM7_FMT_QCIF 0x08 /* QCIF format */
85 #define COM7_RGB 0x04 /* bits 0 and 2 - RGB format */
86 #define COM7_YUV 0x00 /* YUV */
87 #define COM7_BAYER 0x01 /* Bayer format */
88 #define COM7_PBAYER 0x05 /* "Processed bayer" */
89 #define REG_COM8 0x13 /* Control 8 */
90 #define COM8_FASTAEC 0x80 /* Enable fast AGC/AEC */
91 #define COM8_AECSTEP 0x40 /* Unlimited AEC step size */
92 #define COM8_BFILT 0x20 /* Band filter enable */
93 #define COM8_AGC 0x04 /* Auto gain enable */
94 #define COM8_AWB 0x02 /* White balance enable */
95 #define COM8_AEC 0x01 /* Auto exposure enable */
96 #define REG_COM9 0x14 /* Control 9 - gain ceiling */
97 #define REG_COM10 0x15 /* Control 10 */
98 #define COM10_HSYNC 0x40 /* HSYNC instead of HREF */
99 #define COM10_PCLK_HB 0x20 /* Suppress PCLK on horiz blank */
100 #define COM10_HREF_REV 0x08 /* Reverse HREF */
101 #define COM10_VS_LEAD 0x04 /* VSYNC on clock leading edge */
102 #define COM10_VS_NEG 0x02 /* VSYNC negative */
103 #define COM10_HS_NEG 0x01 /* HSYNC negative */
104 #define REG_HSTART 0x17 /* Horiz start high bits */
105 #define REG_HSTOP 0x18 /* Horiz stop high bits */
106 #define REG_VSTART 0x19 /* Vert start high bits */
107 #define REG_VSTOP 0x1a /* Vert stop high bits */
108 #define REG_PSHFT 0x1b /* Pixel delay after HREF */
109 #define REG_MIDH 0x1c /* Manuf. ID high */
110 #define REG_MIDL 0x1d /* Manuf. ID low */
111 #define REG_MVFP 0x1e /* Mirror / vflip */
112 #define MVFP_MIRROR 0x20 /* Mirror image */
113 #define MVFP_FLIP 0x10 /* Vertical flip */
114
115 #define REG_AEW 0x24 /* AGC upper limit */
116 #define REG_AEB 0x25 /* AGC lower limit */
117 #define REG_VPT 0x26 /* AGC/AEC fast mode op region */
118 #define REG_HSYST 0x30 /* HSYNC rising edge delay */
119 #define REG_HSYEN 0x31 /* HSYNC falling edge delay */
120 #define REG_HREF 0x32 /* HREF pieces */
121 #define REG_TSLB 0x3a /* lots of stuff */
122 #define TSLB_YLAST 0x04 /* UYVY or VYUY - see com13 */
123 #define REG_COM11 0x3b /* Control 11 */
124 #define COM11_NIGHT 0x80 /* NIght mode enable */
125 #define COM11_NMFR 0x60 /* Two bit NM frame rate */
126 #define COM11_HZAUTO 0x10 /* Auto detect 50/60 Hz */
127 #define COM11_50HZ 0x08 /* Manual 50Hz select */
128 #define COM11_EXP 0x02
129 #define REG_COM12 0x3c /* Control 12 */
130 #define COM12_HREF 0x80 /* HREF always */
131 #define REG_COM13 0x3d /* Control 13 */
132 #define COM13_GAMMA 0x80 /* Gamma enable */
133 #define COM13_UVSAT 0x40 /* UV saturation auto adjustment */
134 #define COM13_UVSWAP 0x01 /* V before U - w/TSLB */
135 #define REG_COM14 0x3e /* Control 14 */
136 #define COM14_DCWEN 0x10 /* DCW/PCLK-scale enable */
137 #define REG_EDGE 0x3f /* Edge enhancement factor */
138 #define REG_COM15 0x40 /* Control 15 */
139 #define COM15_R10F0 0x00 /* Data range 10 to F0 */
140 #define COM15_R01FE 0x80 /* 01 to FE */
141 #define COM15_R00FF 0xc0 /* 00 to FF */
142 #define COM15_RGB565 0x10 /* RGB565 output */
143 #define COM15_RGB555 0x30 /* RGB555 output */
144 #define REG_COM16 0x41 /* Control 16 */
145 #define COM16_AWBGAIN 0x08 /* AWB gain enable */
146 #define REG_COM17 0x42 /* Control 17 */
147 #define COM17_AECWIN 0xc0 /* AEC window - must match COM4 */
148 #define COM17_CBAR 0x08 /* DSP Color bar */
149
150 /*
151 * This matrix defines how the colors are generated, must be
152 * tweaked to adjust hue and saturation.
153 *
154 * Order: v-red, v-green, v-blue, u-red, u-green, u-blue
155 *
156 * They are nine-bit signed quantities, with the sign bit
157 * stored in 0x58. Sign for v-red is bit 0, and up from there.
158 */
159 #define REG_CMATRIX_BASE 0x4f
160 #define CMATRIX_LEN 6
161 #define REG_CMATRIX_SIGN 0x58
162
163
164 #define REG_BRIGHT 0x55 /* Brightness */
165 #define REG_CONTRAS 0x56 /* Contrast control */
166
167 #define REG_GFIX 0x69 /* Fix gain control */
168
169 #define REG_DBLV 0x6b /* PLL control an debugging */
170 #define DBLV_BYPASS 0x00 /* Bypass PLL */
171 #define DBLV_X4 0x01 /* clock x4 */
172 #define DBLV_X6 0x10 /* clock x6 */
173 #define DBLV_X8 0x11 /* clock x8 */
174
175 #define REG_REG76 0x76 /* OV's name */
176 #define R76_BLKPCOR 0x80 /* Black pixel correction enable */
177 #define R76_WHTPCOR 0x40 /* White pixel correction enable */
178
179 #define REG_RGB444 0x8c /* RGB 444 control */
180 #define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */
181 #define R444_RGBX 0x01 /* Empty nibble at end */
182
183 #define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */
184 #define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */
185
186 #define REG_BD50MAX 0xa5 /* 50hz banding step limit */
187 #define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */
188 #define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */
189 #define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */
190 #define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */
191 #define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
192 #define REG_BD60MAX 0xab /* 60hz banding step limit */
193
194 enum ov7670_model {
195 MODEL_OV7670 = 0,
196 MODEL_OV7675,
197 };
198
199 struct ov7670_win_size {
200 int width;
201 int height;
202 unsigned char com7_bit;
203 int hstart; /* Start/stop values for the camera. Note */
204 int hstop; /* that they do not always make complete */
205 int vstart; /* sense to humans, but evidently the sensor */
206 int vstop; /* will do the right thing... */
207 struct regval_list *regs; /* Regs to tweak */
208 };
209
210 struct ov7670_devtype {
211 /* formats supported for each model */
212 struct ov7670_win_size *win_sizes;
213 unsigned int n_win_sizes;
214 /* callbacks for frame rate control */
215 int (*set_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
216 void (*get_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
217 };
218
219 /*
220 * Information we maintain about a known sensor.
221 */
222 struct ov7670_format_struct; /* coming later */
223 struct ov7670_info {
224 struct v4l2_subdev sd;
225 struct v4l2_ctrl_handler hdl;
226 struct {
227 /* gain cluster */
228 struct v4l2_ctrl *auto_gain;
229 struct v4l2_ctrl *gain;
230 };
231 struct {
232 /* exposure cluster */
233 struct v4l2_ctrl *auto_exposure;
234 struct v4l2_ctrl *exposure;
235 };
236 struct {
237 /* saturation/hue cluster */
238 struct v4l2_ctrl *saturation;
239 struct v4l2_ctrl *hue;
240 };
241 struct ov7670_format_struct *fmt; /* Current format */
242 int min_width; /* Filter out smaller sizes */
243 int min_height; /* Filter out smaller sizes */
244 int clock_speed; /* External clock speed (MHz) */
245 u8 clkrc; /* Clock divider value */
246 bool use_smbus; /* Use smbus I/O instead of I2C */
247 bool pll_bypass;
248 bool pclk_hb_disable;
249 const struct ov7670_devtype *devtype; /* Device specifics */
250 };
251
252 static inline struct ov7670_info *to_state(struct v4l2_subdev *sd)
253 {
254 return container_of(sd, struct ov7670_info, sd);
255 }
256
257 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
258 {
259 return &container_of(ctrl->handler, struct ov7670_info, hdl)->sd;
260 }
261
262
263
264 /*
265 * The default register settings, as obtained from OmniVision. There
266 * is really no making sense of most of these - lots of "reserved" values
267 * and such.
268 *
269 * These settings give VGA YUYV.
270 */
271
272 struct regval_list {
273 unsigned char reg_num;
274 unsigned char value;
275 };
276
277 static struct regval_list ov7670_default_regs[] = {
278 { REG_COM7, COM7_RESET },
279 /*
280 * Clock scale: 3 = 15fps
281 * 2 = 20fps
282 * 1 = 30fps
283 */
284 { REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */
285 { REG_TSLB, 0x04 }, /* OV */
286 { REG_COM7, 0 }, /* VGA */
287 /*
288 * Set the hardware window. These values from OV don't entirely
289 * make sense - hstop is less than hstart. But they work...
290 */
291 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
292 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
293 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },
294
295 { REG_COM3, 0 }, { REG_COM14, 0 },
296 /* Mystery scaling numbers */
297 { 0x70, 0x3a }, { 0x71, 0x35 },
298 { 0x72, 0x11 }, { 0x73, 0xf0 },
299 { 0xa2, 0x02 }, { REG_COM10, 0x0 },
300
301 /* Gamma curve values */
302 { 0x7a, 0x20 }, { 0x7b, 0x10 },
303 { 0x7c, 0x1e }, { 0x7d, 0x35 },
304 { 0x7e, 0x5a }, { 0x7f, 0x69 },
305 { 0x80, 0x76 }, { 0x81, 0x80 },
306 { 0x82, 0x88 }, { 0x83, 0x8f },
307 { 0x84, 0x96 }, { 0x85, 0xa3 },
308 { 0x86, 0xaf }, { 0x87, 0xc4 },
309 { 0x88, 0xd7 }, { 0x89, 0xe8 },
310
311 /* AGC and AEC parameters. Note we start by disabling those features,
312 then turn them only after tweaking the values. */
313 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
314 { REG_GAIN, 0 }, { REG_AECH, 0 },
315 { REG_COM4, 0x40 }, /* magic reserved bit */
316 { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
317 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
318 { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
319 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
320 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */
321 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
322 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
323 { REG_HAECC7, 0x94 },
324 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
325
326 /* Almost all of these are magic "reserved" values. */
327 { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
328 { 0x16, 0x02 }, { REG_MVFP, 0x07 },
329 { 0x21, 0x02 }, { 0x22, 0x91 },
330 { 0x29, 0x07 }, { 0x33, 0x0b },
331 { 0x35, 0x0b }, { 0x37, 0x1d },
332 { 0x38, 0x71 }, { 0x39, 0x2a },
333 { REG_COM12, 0x78 }, { 0x4d, 0x40 },
334 { 0x4e, 0x20 }, { REG_GFIX, 0 },
335 { 0x6b, 0x4a }, { 0x74, 0x10 },
336 { 0x8d, 0x4f }, { 0x8e, 0 },
337 { 0x8f, 0 }, { 0x90, 0 },
338 { 0x91, 0 }, { 0x96, 0 },
339 { 0x9a, 0 }, { 0xb0, 0x84 },
340 { 0xb1, 0x0c }, { 0xb2, 0x0e },
341 { 0xb3, 0x82 }, { 0xb8, 0x0a },
342
343 /* More reserved magic, some of which tweaks white balance */
344 { 0x43, 0x0a }, { 0x44, 0xf0 },
345 { 0x45, 0x34 }, { 0x46, 0x58 },
346 { 0x47, 0x28 }, { 0x48, 0x3a },
347 { 0x59, 0x88 }, { 0x5a, 0x88 },
348 { 0x5b, 0x44 }, { 0x5c, 0x67 },
349 { 0x5d, 0x49 }, { 0x5e, 0x0e },
350 { 0x6c, 0x0a }, { 0x6d, 0x55 },
351 { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */
352 { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
353 { REG_RED, 0x60 },
354 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
355
356 /* Matrix coefficients */
357 { 0x4f, 0x80 }, { 0x50, 0x80 },
358 { 0x51, 0 }, { 0x52, 0x22 },
359 { 0x53, 0x5e }, { 0x54, 0x80 },
360 { 0x58, 0x9e },
361
362 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
363 { 0x75, 0x05 }, { 0x76, 0xe1 },
364 { 0x4c, 0 }, { 0x77, 0x01 },
365 { REG_COM13, 0xc3 }, { 0x4b, 0x09 },
366 { 0xc9, 0x60 }, { REG_COM16, 0x38 },
367 { 0x56, 0x40 },
368
369 { 0x34, 0x11 }, { REG_COM11, COM11_EXP|COM11_HZAUTO },
370 { 0xa4, 0x88 }, { 0x96, 0 },
371 { 0x97, 0x30 }, { 0x98, 0x20 },
372 { 0x99, 0x30 }, { 0x9a, 0x84 },
373 { 0x9b, 0x29 }, { 0x9c, 0x03 },
374 { 0x9d, 0x4c }, { 0x9e, 0x3f },
375 { 0x78, 0x04 },
376
377 /* Extra-weird stuff. Some sort of multiplexor register */
378 { 0x79, 0x01 }, { 0xc8, 0xf0 },
379 { 0x79, 0x0f }, { 0xc8, 0x00 },
380 { 0x79, 0x10 }, { 0xc8, 0x7e },
381 { 0x79, 0x0a }, { 0xc8, 0x80 },
382 { 0x79, 0x0b }, { 0xc8, 0x01 },
383 { 0x79, 0x0c }, { 0xc8, 0x0f },
384 { 0x79, 0x0d }, { 0xc8, 0x20 },
385 { 0x79, 0x09 }, { 0xc8, 0x80 },
386 { 0x79, 0x02 }, { 0xc8, 0xc0 },
387 { 0x79, 0x03 }, { 0xc8, 0x40 },
388 { 0x79, 0x05 }, { 0xc8, 0x30 },
389 { 0x79, 0x26 },
390
391 { 0xff, 0xff }, /* END MARKER */
392 };
393
394
395 /*
396 * Here we'll try to encapsulate the changes for just the output
397 * video format.
398 *
399 * RGB656 and YUV422 come from OV; RGB444 is homebrewed.
400 *
401 * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why.
402 */
403
404
405 static struct regval_list ov7670_fmt_yuv422[] = {
406 { REG_COM7, 0x0 }, /* Selects YUV mode */
407 { REG_RGB444, 0 }, /* No RGB444 please */
408 { REG_COM1, 0 }, /* CCIR601 */
409 { REG_COM15, COM15_R00FF },
410 { REG_COM9, 0x48 }, /* 32x gain ceiling; 0x8 is reserved bit */
411 { 0x4f, 0x80 }, /* "matrix coefficient 1" */
412 { 0x50, 0x80 }, /* "matrix coefficient 2" */
413 { 0x51, 0 }, /* vb */
414 { 0x52, 0x22 }, /* "matrix coefficient 4" */
415 { 0x53, 0x5e }, /* "matrix coefficient 5" */
416 { 0x54, 0x80 }, /* "matrix coefficient 6" */
417 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
418 { 0xff, 0xff },
419 };
420
421 static struct regval_list ov7670_fmt_rgb565[] = {
422 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
423 { REG_RGB444, 0 }, /* No RGB444 please */
424 { REG_COM1, 0x0 }, /* CCIR601 */
425 { REG_COM15, COM15_RGB565 },
426 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
427 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
428 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
429 { 0x51, 0 }, /* vb */
430 { 0x52, 0x3d }, /* "matrix coefficient 4" */
431 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
432 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
433 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
434 { 0xff, 0xff },
435 };
436
437 static struct regval_list ov7670_fmt_rgb444[] = {
438 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
439 { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */
440 { REG_COM1, 0x0 }, /* CCIR601 */
441 { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */
442 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
443 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
444 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
445 { 0x51, 0 }, /* vb */
446 { 0x52, 0x3d }, /* "matrix coefficient 4" */
447 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
448 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
449 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */
450 { 0xff, 0xff },
451 };
452
453 static struct regval_list ov7670_fmt_raw[] = {
454 { REG_COM7, COM7_BAYER },
455 { REG_COM13, 0x08 }, /* No gamma, magic rsvd bit */
456 { REG_COM16, 0x3d }, /* Edge enhancement, denoise */
457 { REG_REG76, 0xe1 }, /* Pix correction, magic rsvd */
458 { 0xff, 0xff },
459 };
460
461
462
463 /*
464 * Low-level register I/O.
465 *
466 * Note that there are two versions of these. On the XO 1, the
467 * i2c controller only does SMBUS, so that's what we use. The
468 * ov7670 is not really an SMBUS device, though, so the communication
469 * is not always entirely reliable.
470 */
471 static int ov7670_read_smbus(struct v4l2_subdev *sd, unsigned char reg,
472 unsigned char *value)
473 {
474 struct i2c_client *client = v4l2_get_subdevdata(sd);
475 int ret;
476
477 ret = i2c_smbus_read_byte_data(client, reg);
478 if (ret >= 0) {
479 *value = (unsigned char)ret;
480 ret = 0;
481 }
482 return ret;
483 }
484
485
486 static int ov7670_write_smbus(struct v4l2_subdev *sd, unsigned char reg,
487 unsigned char value)
488 {
489 struct i2c_client *client = v4l2_get_subdevdata(sd);
490 int ret = i2c_smbus_write_byte_data(client, reg, value);
491
492 if (reg == REG_COM7 && (value & COM7_RESET))
493 msleep(5); /* Wait for reset to run */
494 return ret;
495 }
496
497 /*
498 * On most platforms, we'd rather do straight i2c I/O.
499 */
500 static int ov7670_read_i2c(struct v4l2_subdev *sd, unsigned char reg,
501 unsigned char *value)
502 {
503 struct i2c_client *client = v4l2_get_subdevdata(sd);
504 u8 data = reg;
505 struct i2c_msg msg;
506 int ret;
507
508 /*
509 * Send out the register address...
510 */
511 msg.addr = client->addr;
512 msg.flags = 0;
513 msg.len = 1;
514 msg.buf = &data;
515 ret = i2c_transfer(client->adapter, &msg, 1);
516 if (ret < 0) {
517 printk(KERN_ERR "Error %d on register write\n", ret);
518 return ret;
519 }
520 /*
521 * ...then read back the result.
522 */
523 msg.flags = I2C_M_RD;
524 ret = i2c_transfer(client->adapter, &msg, 1);
525 if (ret >= 0) {
526 *value = data;
527 ret = 0;
528 }
529 return ret;
530 }
531
532
533 static int ov7670_write_i2c(struct v4l2_subdev *sd, unsigned char reg,
534 unsigned char value)
535 {
536 struct i2c_client *client = v4l2_get_subdevdata(sd);
537 struct i2c_msg msg;
538 unsigned char data[2] = { reg, value };
539 int ret;
540
541 msg.addr = client->addr;
542 msg.flags = 0;
543 msg.len = 2;
544 msg.buf = data;
545 ret = i2c_transfer(client->adapter, &msg, 1);
546 if (ret > 0)
547 ret = 0;
548 if (reg == REG_COM7 && (value & COM7_RESET))
549 msleep(5); /* Wait for reset to run */
550 return ret;
551 }
552
553 static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
554 unsigned char *value)
555 {
556 struct ov7670_info *info = to_state(sd);
557 if (info->use_smbus)
558 return ov7670_read_smbus(sd, reg, value);
559 else
560 return ov7670_read_i2c(sd, reg, value);
561 }
562
563 static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
564 unsigned char value)
565 {
566 struct ov7670_info *info = to_state(sd);
567 if (info->use_smbus)
568 return ov7670_write_smbus(sd, reg, value);
569 else
570 return ov7670_write_i2c(sd, reg, value);
571 }
572
573 /*
574 * Write a list of register settings; ff/ff stops the process.
575 */
576 static int ov7670_write_array(struct v4l2_subdev *sd, struct regval_list *vals)
577 {
578 while (vals->reg_num != 0xff || vals->value != 0xff) {
579 int ret = ov7670_write(sd, vals->reg_num, vals->value);
580 if (ret < 0)
581 return ret;
582 vals++;
583 }
584 return 0;
585 }
586
587
588 /*
589 * Stuff that knows about the sensor.
590 */
591 static int ov7670_reset(struct v4l2_subdev *sd, u32 val)
592 {
593 ov7670_write(sd, REG_COM7, COM7_RESET);
594 msleep(1);
595 return 0;
596 }
597
598
599 static int ov7670_init(struct v4l2_subdev *sd, u32 val)
600 {
601 return ov7670_write_array(sd, ov7670_default_regs);
602 }
603
604
605
606 static int ov7670_detect(struct v4l2_subdev *sd)
607 {
608 unsigned char v;
609 int ret;
610
611 ret = ov7670_init(sd, 0);
612 if (ret < 0)
613 return ret;
614 ret = ov7670_read(sd, REG_MIDH, &v);
615 if (ret < 0)
616 return ret;
617 if (v != 0x7f) /* OV manuf. id. */
618 return -ENODEV;
619 ret = ov7670_read(sd, REG_MIDL, &v);
620 if (ret < 0)
621 return ret;
622 if (v != 0xa2)
623 return -ENODEV;
624 /*
625 * OK, we know we have an OmniVision chip...but which one?
626 */
627 ret = ov7670_read(sd, REG_PID, &v);
628 if (ret < 0)
629 return ret;
630 if (v != 0x76) /* PID + VER = 0x76 / 0x73 */
631 return -ENODEV;
632 ret = ov7670_read(sd, REG_VER, &v);
633 if (ret < 0)
634 return ret;
635 if (v != 0x73) /* PID + VER = 0x76 / 0x73 */
636 return -ENODEV;
637 return 0;
638 }
639
640
641 /*
642 * Store information about the video data format. The color matrix
643 * is deeply tied into the format, so keep the relevant values here.
644 * The magic matrix numbers come from OmniVision.
645 */
646 static struct ov7670_format_struct {
647 enum v4l2_mbus_pixelcode mbus_code;
648 enum v4l2_colorspace colorspace;
649 struct regval_list *regs;
650 int cmatrix[CMATRIX_LEN];
651 } ov7670_formats[] = {
652 {
653 .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8,
654 .colorspace = V4L2_COLORSPACE_JPEG,
655 .regs = ov7670_fmt_yuv422,
656 .cmatrix = { 128, -128, 0, -34, -94, 128 },
657 },
658 {
659 .mbus_code = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE,
660 .colorspace = V4L2_COLORSPACE_SRGB,
661 .regs = ov7670_fmt_rgb444,
662 .cmatrix = { 179, -179, 0, -61, -176, 228 },
663 },
664 {
665 .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE,
666 .colorspace = V4L2_COLORSPACE_SRGB,
667 .regs = ov7670_fmt_rgb565,
668 .cmatrix = { 179, -179, 0, -61, -176, 228 },
669 },
670 {
671 .mbus_code = V4L2_MBUS_FMT_SBGGR8_1X8,
672 .colorspace = V4L2_COLORSPACE_SRGB,
673 .regs = ov7670_fmt_raw,
674 .cmatrix = { 0, 0, 0, 0, 0, 0 },
675 },
676 };
677 #define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats)
678
679
680 /*
681 * Then there is the issue of window sizes. Try to capture the info here.
682 */
683
684 /*
685 * QCIF mode is done (by OV) in a very strange way - it actually looks like
686 * VGA with weird scaling options - they do *not* use the canned QCIF mode
687 * which is allegedly provided by the sensor. So here's the weird register
688 * settings.
689 */
690 static struct regval_list ov7670_qcif_regs[] = {
691 { REG_COM3, COM3_SCALEEN|COM3_DCWEN },
692 { REG_COM3, COM3_DCWEN },
693 { REG_COM14, COM14_DCWEN | 0x01},
694 { 0x73, 0xf1 },
695 { 0xa2, 0x52 },
696 { 0x7b, 0x1c },
697 { 0x7c, 0x28 },
698 { 0x7d, 0x3c },
699 { 0x7f, 0x69 },
700 { REG_COM9, 0x38 },
701 { 0xa1, 0x0b },
702 { 0x74, 0x19 },
703 { 0x9a, 0x80 },
704 { 0x43, 0x14 },
705 { REG_COM13, 0xc0 },
706 { 0xff, 0xff },
707 };
708
709 static struct ov7670_win_size ov7670_win_sizes[] = {
710 /* VGA */
711 {
712 .width = VGA_WIDTH,
713 .height = VGA_HEIGHT,
714 .com7_bit = COM7_FMT_VGA,
715 .hstart = 158, /* These values from */
716 .hstop = 14, /* Omnivision */
717 .vstart = 10,
718 .vstop = 490,
719 .regs = NULL,
720 },
721 /* CIF */
722 {
723 .width = CIF_WIDTH,
724 .height = CIF_HEIGHT,
725 .com7_bit = COM7_FMT_CIF,
726 .hstart = 170, /* Empirically determined */
727 .hstop = 90,
728 .vstart = 14,
729 .vstop = 494,
730 .regs = NULL,
731 },
732 /* QVGA */
733 {
734 .width = QVGA_WIDTH,
735 .height = QVGA_HEIGHT,
736 .com7_bit = COM7_FMT_QVGA,
737 .hstart = 168, /* Empirically determined */
738 .hstop = 24,
739 .vstart = 12,
740 .vstop = 492,
741 .regs = NULL,
742 },
743 /* QCIF */
744 {
745 .width = QCIF_WIDTH,
746 .height = QCIF_HEIGHT,
747 .com7_bit = COM7_FMT_VGA, /* see comment above */
748 .hstart = 456, /* Empirically determined */
749 .hstop = 24,
750 .vstart = 14,
751 .vstop = 494,
752 .regs = ov7670_qcif_regs,
753 }
754 };
755
756 static struct ov7670_win_size ov7675_win_sizes[] = {
757 /*
758 * Currently, only VGA is supported. Theoretically it could be possible
759 * to support CIF, QVGA and QCIF too. Taking values for ov7670 as a
760 * base and tweak them empirically could be required.
761 */
762 {
763 .width = VGA_WIDTH,
764 .height = VGA_HEIGHT,
765 .com7_bit = COM7_FMT_VGA,
766 .hstart = 158, /* These values from */
767 .hstop = 14, /* Omnivision */
768 .vstart = 14, /* Empirically determined */
769 .vstop = 494,
770 .regs = NULL,
771 }
772 };
773
774 static void ov7675_get_framerate(struct v4l2_subdev *sd,
775 struct v4l2_fract *tpf)
776 {
777 struct ov7670_info *info = to_state(sd);
778 u32 clkrc = info->clkrc;
779 int pll_factor;
780
781 if (info->pll_bypass)
782 pll_factor = 1;
783 else
784 pll_factor = PLL_FACTOR;
785
786 clkrc++;
787 if (info->fmt->mbus_code == V4L2_MBUS_FMT_SBGGR8_1X8)
788 clkrc = (clkrc >> 1);
789
790 tpf->numerator = 1;
791 tpf->denominator = (5 * pll_factor * info->clock_speed) /
792 (4 * clkrc);
793 }
794
795 static int ov7675_set_framerate(struct v4l2_subdev *sd,
796 struct v4l2_fract *tpf)
797 {
798 struct ov7670_info *info = to_state(sd);
799 u32 clkrc;
800 int pll_factor;
801 int ret;
802
803 /*
804 * The formula is fps = 5/4*pixclk for YUV/RGB and
805 * fps = 5/2*pixclk for RAW.
806 *
807 * pixclk = clock_speed / (clkrc + 1) * PLLfactor
808 *
809 */
810 if (info->pll_bypass) {
811 pll_factor = 1;
812 ret = ov7670_write(sd, REG_DBLV, DBLV_BYPASS);
813 } else {
814 pll_factor = PLL_FACTOR;
815 ret = ov7670_write(sd, REG_DBLV, DBLV_X4);
816 }
817 if (ret < 0)
818 return ret;
819
820 if (tpf->numerator == 0 || tpf->denominator == 0) {
821 clkrc = 0;
822 } else {
823 clkrc = (5 * pll_factor * info->clock_speed * tpf->numerator) /
824 (4 * tpf->denominator);
825 if (info->fmt->mbus_code == V4L2_MBUS_FMT_SBGGR8_1X8)
826 clkrc = (clkrc << 1);
827 clkrc--;
828 }
829
830 /*
831 * The datasheet claims that clkrc = 0 will divide the input clock by 1
832 * but we've checked with an oscilloscope that it divides by 2 instead.
833 * So, if clkrc = 0 just bypass the divider.
834 */
835 if (clkrc <= 0)
836 clkrc = CLK_EXT;
837 else if (clkrc > CLK_SCALE)
838 clkrc = CLK_SCALE;
839 info->clkrc = clkrc;
840
841 /* Recalculate frame rate */
842 ov7675_get_framerate(sd, tpf);
843
844 ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
845 if (ret < 0)
846 return ret;
847
848 return ov7670_write(sd, REG_DBLV, DBLV_X4);
849 }
850
851 static void ov7670_get_framerate_legacy(struct v4l2_subdev *sd,
852 struct v4l2_fract *tpf)
853 {
854 struct ov7670_info *info = to_state(sd);
855
856 tpf->numerator = 1;
857 tpf->denominator = info->clock_speed;
858 if ((info->clkrc & CLK_EXT) == 0 && (info->clkrc & CLK_SCALE) > 1)
859 tpf->denominator /= (info->clkrc & CLK_SCALE);
860 }
861
862 static int ov7670_set_framerate_legacy(struct v4l2_subdev *sd,
863 struct v4l2_fract *tpf)
864 {
865 struct ov7670_info *info = to_state(sd);
866 int div;
867
868 if (tpf->numerator == 0 || tpf->denominator == 0)
869 div = 1; /* Reset to full rate */
870 else
871 div = (tpf->numerator * info->clock_speed) / tpf->denominator;
872 if (div == 0)
873 div = 1;
874 else if (div > CLK_SCALE)
875 div = CLK_SCALE;
876 info->clkrc = (info->clkrc & 0x80) | div;
877 tpf->numerator = 1;
878 tpf->denominator = info->clock_speed / div;
879 return ov7670_write(sd, REG_CLKRC, info->clkrc);
880 }
881
882 /*
883 * Store a set of start/stop values into the camera.
884 */
885 static int ov7670_set_hw(struct v4l2_subdev *sd, int hstart, int hstop,
886 int vstart, int vstop)
887 {
888 int ret;
889 unsigned char v;
890 /*
891 * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of
892 * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is
893 * a mystery "edge offset" value in the top two bits of href.
894 */
895 ret = ov7670_write(sd, REG_HSTART, (hstart >> 3) & 0xff);
896 ret += ov7670_write(sd, REG_HSTOP, (hstop >> 3) & 0xff);
897 ret += ov7670_read(sd, REG_HREF, &v);
898 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
899 msleep(10);
900 ret += ov7670_write(sd, REG_HREF, v);
901 /*
902 * Vertical: similar arrangement, but only 10 bits.
903 */
904 ret += ov7670_write(sd, REG_VSTART, (vstart >> 2) & 0xff);
905 ret += ov7670_write(sd, REG_VSTOP, (vstop >> 2) & 0xff);
906 ret += ov7670_read(sd, REG_VREF, &v);
907 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
908 msleep(10);
909 ret += ov7670_write(sd, REG_VREF, v);
910 return ret;
911 }
912
913
914 static int ov7670_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned index,
915 enum v4l2_mbus_pixelcode *code)
916 {
917 if (index >= N_OV7670_FMTS)
918 return -EINVAL;
919
920 *code = ov7670_formats[index].mbus_code;
921 return 0;
922 }
923
924 static int ov7670_try_fmt_internal(struct v4l2_subdev *sd,
925 struct v4l2_mbus_framefmt *fmt,
926 struct ov7670_format_struct **ret_fmt,
927 struct ov7670_win_size **ret_wsize)
928 {
929 int index, i;
930 struct ov7670_win_size *wsize;
931 struct ov7670_info *info = to_state(sd);
932 unsigned int n_win_sizes = info->devtype->n_win_sizes;
933 unsigned int win_sizes_limit = n_win_sizes;
934
935 for (index = 0; index < N_OV7670_FMTS; index++)
936 if (ov7670_formats[index].mbus_code == fmt->code)
937 break;
938 if (index >= N_OV7670_FMTS) {
939 /* default to first format */
940 index = 0;
941 fmt->code = ov7670_formats[0].mbus_code;
942 }
943 if (ret_fmt != NULL)
944 *ret_fmt = ov7670_formats + index;
945 /*
946 * Fields: the OV devices claim to be progressive.
947 */
948 fmt->field = V4L2_FIELD_NONE;
949
950 /*
951 * Don't consider values that don't match min_height and min_width
952 * constraints.
953 */
954 if (info->min_width || info->min_height)
955 for (i = 0; i < n_win_sizes; i++) {
956 wsize = info->devtype->win_sizes + i;
957
958 if (wsize->width < info->min_width ||
959 wsize->height < info->min_height) {
960 win_sizes_limit = i;
961 break;
962 }
963 }
964 /*
965 * Round requested image size down to the nearest
966 * we support, but not below the smallest.
967 */
968 for (wsize = info->devtype->win_sizes;
969 wsize < info->devtype->win_sizes + win_sizes_limit; wsize++)
970 if (fmt->width >= wsize->width && fmt->height >= wsize->height)
971 break;
972 if (wsize >= info->devtype->win_sizes + win_sizes_limit)
973 wsize--; /* Take the smallest one */
974 if (ret_wsize != NULL)
975 *ret_wsize = wsize;
976 /*
977 * Note the size we'll actually handle.
978 */
979 fmt->width = wsize->width;
980 fmt->height = wsize->height;
981 fmt->colorspace = ov7670_formats[index].colorspace;
982 return 0;
983 }
984
985 static int ov7670_try_mbus_fmt(struct v4l2_subdev *sd,
986 struct v4l2_mbus_framefmt *fmt)
987 {
988 return ov7670_try_fmt_internal(sd, fmt, NULL, NULL);
989 }
990
991 /*
992 * Set a format.
993 */
994 static int ov7670_s_mbus_fmt(struct v4l2_subdev *sd,
995 struct v4l2_mbus_framefmt *fmt)
996 {
997 struct ov7670_format_struct *ovfmt;
998 struct ov7670_win_size *wsize;
999 struct ov7670_info *info = to_state(sd);
1000 unsigned char com7;
1001 int ret;
1002
1003 ret = ov7670_try_fmt_internal(sd, fmt, &ovfmt, &wsize);
1004
1005 if (ret)
1006 return ret;
1007 /*
1008 * COM7 is a pain in the ass, it doesn't like to be read then
1009 * quickly written afterward. But we have everything we need
1010 * to set it absolutely here, as long as the format-specific
1011 * register sets list it first.
1012 */
1013 com7 = ovfmt->regs[0].value;
1014 com7 |= wsize->com7_bit;
1015 ov7670_write(sd, REG_COM7, com7);
1016 /*
1017 * Now write the rest of the array. Also store start/stops
1018 */
1019 ov7670_write_array(sd, ovfmt->regs + 1);
1020 ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
1021 wsize->vstop);
1022 ret = 0;
1023 if (wsize->regs)
1024 ret = ov7670_write_array(sd, wsize->regs);
1025 info->fmt = ovfmt;
1026
1027 /*
1028 * If we're running RGB565, we must rewrite clkrc after setting
1029 * the other parameters or the image looks poor. If we're *not*
1030 * doing RGB565, we must not rewrite clkrc or the image looks
1031 * *really* poor.
1032 *
1033 * (Update) Now that we retain clkrc state, we should be able
1034 * to write it unconditionally, and that will make the frame
1035 * rate persistent too.
1036 */
1037 if (ret == 0)
1038 ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
1039 return 0;
1040 }
1041
1042 /*
1043 * Implement G/S_PARM. There is a "high quality" mode we could try
1044 * to do someday; for now, we just do the frame rate tweak.
1045 */
1046 static int ov7670_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
1047 {
1048 struct v4l2_captureparm *cp = &parms->parm.capture;
1049 struct ov7670_info *info = to_state(sd);
1050
1051 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1052 return -EINVAL;
1053
1054 memset(cp, 0, sizeof(struct v4l2_captureparm));
1055 cp->capability = V4L2_CAP_TIMEPERFRAME;
1056 info->devtype->get_framerate(sd, &cp->timeperframe);
1057
1058 return 0;
1059 }
1060
1061 static int ov7670_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
1062 {
1063 struct v4l2_captureparm *cp = &parms->parm.capture;
1064 struct v4l2_fract *tpf = &cp->timeperframe;
1065 struct ov7670_info *info = to_state(sd);
1066
1067 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1068 return -EINVAL;
1069 if (cp->extendedmode != 0)
1070 return -EINVAL;
1071
1072 return info->devtype->set_framerate(sd, tpf);
1073 }
1074
1075
1076 /*
1077 * Frame intervals. Since frame rates are controlled with the clock
1078 * divider, we can only do 30/n for integer n values. So no continuous
1079 * or stepwise options. Here we just pick a handful of logical values.
1080 */
1081
1082 static int ov7670_frame_rates[] = { 30, 15, 10, 5, 1 };
1083
1084 static int ov7670_enum_frameintervals(struct v4l2_subdev *sd,
1085 struct v4l2_frmivalenum *interval)
1086 {
1087 if (interval->index >= ARRAY_SIZE(ov7670_frame_rates))
1088 return -EINVAL;
1089 interval->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1090 interval->discrete.numerator = 1;
1091 interval->discrete.denominator = ov7670_frame_rates[interval->index];
1092 return 0;
1093 }
1094
1095 /*
1096 * Frame size enumeration
1097 */
1098 static int ov7670_enum_framesizes(struct v4l2_subdev *sd,
1099 struct v4l2_frmsizeenum *fsize)
1100 {
1101 struct ov7670_info *info = to_state(sd);
1102 int i;
1103 int num_valid = -1;
1104 __u32 index = fsize->index;
1105 unsigned int n_win_sizes = info->devtype->n_win_sizes;
1106
1107 /*
1108 * If a minimum width/height was requested, filter out the capture
1109 * windows that fall outside that.
1110 */
1111 for (i = 0; i < n_win_sizes; i++) {
1112 struct ov7670_win_size *win = &info->devtype->win_sizes[i];
1113 if (info->min_width && win->width < info->min_width)
1114 continue;
1115 if (info->min_height && win->height < info->min_height)
1116 continue;
1117 if (index == ++num_valid) {
1118 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1119 fsize->discrete.width = win->width;
1120 fsize->discrete.height = win->height;
1121 return 0;
1122 }
1123 }
1124
1125 return -EINVAL;
1126 }
1127
1128 /*
1129 * Code for dealing with controls.
1130 */
1131
1132 static int ov7670_store_cmatrix(struct v4l2_subdev *sd,
1133 int matrix[CMATRIX_LEN])
1134 {
1135 int i, ret;
1136 unsigned char signbits = 0;
1137
1138 /*
1139 * Weird crap seems to exist in the upper part of
1140 * the sign bits register, so let's preserve it.
1141 */
1142 ret = ov7670_read(sd, REG_CMATRIX_SIGN, &signbits);
1143 signbits &= 0xc0;
1144
1145 for (i = 0; i < CMATRIX_LEN; i++) {
1146 unsigned char raw;
1147
1148 if (matrix[i] < 0) {
1149 signbits |= (1 << i);
1150 if (matrix[i] < -255)
1151 raw = 0xff;
1152 else
1153 raw = (-1 * matrix[i]) & 0xff;
1154 }
1155 else {
1156 if (matrix[i] > 255)
1157 raw = 0xff;
1158 else
1159 raw = matrix[i] & 0xff;
1160 }
1161 ret += ov7670_write(sd, REG_CMATRIX_BASE + i, raw);
1162 }
1163 ret += ov7670_write(sd, REG_CMATRIX_SIGN, signbits);
1164 return ret;
1165 }
1166
1167
1168 /*
1169 * Hue also requires messing with the color matrix. It also requires
1170 * trig functions, which tend not to be well supported in the kernel.
1171 * So here is a simple table of sine values, 0-90 degrees, in steps
1172 * of five degrees. Values are multiplied by 1000.
1173 *
1174 * The following naive approximate trig functions require an argument
1175 * carefully limited to -180 <= theta <= 180.
1176 */
1177 #define SIN_STEP 5
1178 static const int ov7670_sin_table[] = {
1179 0, 87, 173, 258, 342, 422,
1180 499, 573, 642, 707, 766, 819,
1181 866, 906, 939, 965, 984, 996,
1182 1000
1183 };
1184
1185 static int ov7670_sine(int theta)
1186 {
1187 int chs = 1;
1188 int sine;
1189
1190 if (theta < 0) {
1191 theta = -theta;
1192 chs = -1;
1193 }
1194 if (theta <= 90)
1195 sine = ov7670_sin_table[theta/SIN_STEP];
1196 else {
1197 theta -= 90;
1198 sine = 1000 - ov7670_sin_table[theta/SIN_STEP];
1199 }
1200 return sine*chs;
1201 }
1202
1203 static int ov7670_cosine(int theta)
1204 {
1205 theta = 90 - theta;
1206 if (theta > 180)
1207 theta -= 360;
1208 else if (theta < -180)
1209 theta += 360;
1210 return ov7670_sine(theta);
1211 }
1212
1213
1214
1215
1216 static void ov7670_calc_cmatrix(struct ov7670_info *info,
1217 int matrix[CMATRIX_LEN], int sat, int hue)
1218 {
1219 int i;
1220 /*
1221 * Apply the current saturation setting first.
1222 */
1223 for (i = 0; i < CMATRIX_LEN; i++)
1224 matrix[i] = (info->fmt->cmatrix[i] * sat) >> 7;
1225 /*
1226 * Then, if need be, rotate the hue value.
1227 */
1228 if (hue != 0) {
1229 int sinth, costh, tmpmatrix[CMATRIX_LEN];
1230
1231 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
1232 sinth = ov7670_sine(hue);
1233 costh = ov7670_cosine(hue);
1234
1235 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000;
1236 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000;
1237 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000;
1238 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000;
1239 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000;
1240 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000;
1241 }
1242 }
1243
1244
1245
1246 static int ov7670_s_sat_hue(struct v4l2_subdev *sd, int sat, int hue)
1247 {
1248 struct ov7670_info *info = to_state(sd);
1249 int matrix[CMATRIX_LEN];
1250 int ret;
1251
1252 ov7670_calc_cmatrix(info, matrix, sat, hue);
1253 ret = ov7670_store_cmatrix(sd, matrix);
1254 return ret;
1255 }
1256
1257
1258 /*
1259 * Some weird registers seem to store values in a sign/magnitude format!
1260 */
1261
1262 static unsigned char ov7670_abs_to_sm(unsigned char v)
1263 {
1264 if (v > 127)
1265 return v & 0x7f;
1266 return (128 - v) | 0x80;
1267 }
1268
1269 static int ov7670_s_brightness(struct v4l2_subdev *sd, int value)
1270 {
1271 unsigned char com8 = 0, v;
1272 int ret;
1273
1274 ov7670_read(sd, REG_COM8, &com8);
1275 com8 &= ~COM8_AEC;
1276 ov7670_write(sd, REG_COM8, com8);
1277 v = ov7670_abs_to_sm(value);
1278 ret = ov7670_write(sd, REG_BRIGHT, v);
1279 return ret;
1280 }
1281
1282 static int ov7670_s_contrast(struct v4l2_subdev *sd, int value)
1283 {
1284 return ov7670_write(sd, REG_CONTRAS, (unsigned char) value);
1285 }
1286
1287 static int ov7670_s_hflip(struct v4l2_subdev *sd, int value)
1288 {
1289 unsigned char v = 0;
1290 int ret;
1291
1292 ret = ov7670_read(sd, REG_MVFP, &v);
1293 if (value)
1294 v |= MVFP_MIRROR;
1295 else
1296 v &= ~MVFP_MIRROR;
1297 msleep(10); /* FIXME */
1298 ret += ov7670_write(sd, REG_MVFP, v);
1299 return ret;
1300 }
1301
1302 static int ov7670_s_vflip(struct v4l2_subdev *sd, int value)
1303 {
1304 unsigned char v = 0;
1305 int ret;
1306
1307 ret = ov7670_read(sd, REG_MVFP, &v);
1308 if (value)
1309 v |= MVFP_FLIP;
1310 else
1311 v &= ~MVFP_FLIP;
1312 msleep(10); /* FIXME */
1313 ret += ov7670_write(sd, REG_MVFP, v);
1314 return ret;
1315 }
1316
1317 /*
1318 * GAIN is split between REG_GAIN and REG_VREF[7:6]. If one believes
1319 * the data sheet, the VREF parts should be the most significant, but
1320 * experience shows otherwise. There seems to be little value in
1321 * messing with the VREF bits, so we leave them alone.
1322 */
1323 static int ov7670_g_gain(struct v4l2_subdev *sd, __s32 *value)
1324 {
1325 int ret;
1326 unsigned char gain;
1327
1328 ret = ov7670_read(sd, REG_GAIN, &gain);
1329 *value = gain;
1330 return ret;
1331 }
1332
1333 static int ov7670_s_gain(struct v4l2_subdev *sd, int value)
1334 {
1335 int ret;
1336 unsigned char com8;
1337
1338 ret = ov7670_write(sd, REG_GAIN, value & 0xff);
1339 /* Have to turn off AGC as well */
1340 if (ret == 0) {
1341 ret = ov7670_read(sd, REG_COM8, &com8);
1342 ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AGC);
1343 }
1344 return ret;
1345 }
1346
1347 /*
1348 * Tweak autogain.
1349 */
1350 static int ov7670_s_autogain(struct v4l2_subdev *sd, int value)
1351 {
1352 int ret;
1353 unsigned char com8;
1354
1355 ret = ov7670_read(sd, REG_COM8, &com8);
1356 if (ret == 0) {
1357 if (value)
1358 com8 |= COM8_AGC;
1359 else
1360 com8 &= ~COM8_AGC;
1361 ret = ov7670_write(sd, REG_COM8, com8);
1362 }
1363 return ret;
1364 }
1365
1366 static int ov7670_s_exp(struct v4l2_subdev *sd, int value)
1367 {
1368 int ret;
1369 unsigned char com1, com8, aech, aechh;
1370
1371 ret = ov7670_read(sd, REG_COM1, &com1) +
1372 ov7670_read(sd, REG_COM8, &com8);
1373 ov7670_read(sd, REG_AECHH, &aechh);
1374 if (ret)
1375 return ret;
1376
1377 com1 = (com1 & 0xfc) | (value & 0x03);
1378 aech = (value >> 2) & 0xff;
1379 aechh = (aechh & 0xc0) | ((value >> 10) & 0x3f);
1380 ret = ov7670_write(sd, REG_COM1, com1) +
1381 ov7670_write(sd, REG_AECH, aech) +
1382 ov7670_write(sd, REG_AECHH, aechh);
1383 /* Have to turn off AEC as well */
1384 if (ret == 0)
1385 ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AEC);
1386 return ret;
1387 }
1388
1389 /*
1390 * Tweak autoexposure.
1391 */
1392 static int ov7670_s_autoexp(struct v4l2_subdev *sd,
1393 enum v4l2_exposure_auto_type value)
1394 {
1395 int ret;
1396 unsigned char com8;
1397
1398 ret = ov7670_read(sd, REG_COM8, &com8);
1399 if (ret == 0) {
1400 if (value == V4L2_EXPOSURE_AUTO)
1401 com8 |= COM8_AEC;
1402 else
1403 com8 &= ~COM8_AEC;
1404 ret = ov7670_write(sd, REG_COM8, com8);
1405 }
1406 return ret;
1407 }
1408
1409
1410 static int ov7670_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
1411 {
1412 struct v4l2_subdev *sd = to_sd(ctrl);
1413 struct ov7670_info *info = to_state(sd);
1414
1415 switch (ctrl->id) {
1416 case V4L2_CID_AUTOGAIN:
1417 return ov7670_g_gain(sd, &info->gain->val);
1418 }
1419 return -EINVAL;
1420 }
1421
1422 static int ov7670_s_ctrl(struct v4l2_ctrl *ctrl)
1423 {
1424 struct v4l2_subdev *sd = to_sd(ctrl);
1425 struct ov7670_info *info = to_state(sd);
1426
1427 switch (ctrl->id) {
1428 case V4L2_CID_BRIGHTNESS:
1429 return ov7670_s_brightness(sd, ctrl->val);
1430 case V4L2_CID_CONTRAST:
1431 return ov7670_s_contrast(sd, ctrl->val);
1432 case V4L2_CID_SATURATION:
1433 return ov7670_s_sat_hue(sd,
1434 info->saturation->val, info->hue->val);
1435 case V4L2_CID_VFLIP:
1436 return ov7670_s_vflip(sd, ctrl->val);
1437 case V4L2_CID_HFLIP:
1438 return ov7670_s_hflip(sd, ctrl->val);
1439 case V4L2_CID_AUTOGAIN:
1440 /* Only set manual gain if auto gain is not explicitly
1441 turned on. */
1442 if (!ctrl->val) {
1443 /* ov7670_s_gain turns off auto gain */
1444 return ov7670_s_gain(sd, info->gain->val);
1445 }
1446 return ov7670_s_autogain(sd, ctrl->val);
1447 case V4L2_CID_EXPOSURE_AUTO:
1448 /* Only set manual exposure if auto exposure is not explicitly
1449 turned on. */
1450 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
1451 /* ov7670_s_exp turns off auto exposure */
1452 return ov7670_s_exp(sd, info->exposure->val);
1453 }
1454 return ov7670_s_autoexp(sd, ctrl->val);
1455 }
1456 return -EINVAL;
1457 }
1458
1459 static const struct v4l2_ctrl_ops ov7670_ctrl_ops = {
1460 .s_ctrl = ov7670_s_ctrl,
1461 .g_volatile_ctrl = ov7670_g_volatile_ctrl,
1462 };
1463
1464 #ifdef CONFIG_VIDEO_ADV_DEBUG
1465 static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
1466 {
1467 unsigned char val = 0;
1468 int ret;
1469
1470 ret = ov7670_read(sd, reg->reg & 0xff, &val);
1471 reg->val = val;
1472 reg->size = 1;
1473 return ret;
1474 }
1475
1476 static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
1477 {
1478 ov7670_write(sd, reg->reg & 0xff, reg->val & 0xff);
1479 return 0;
1480 }
1481 #endif
1482
1483 /* ----------------------------------------------------------------------- */
1484
1485 static const struct v4l2_subdev_core_ops ov7670_core_ops = {
1486 .reset = ov7670_reset,
1487 .init = ov7670_init,
1488 #ifdef CONFIG_VIDEO_ADV_DEBUG
1489 .g_register = ov7670_g_register,
1490 .s_register = ov7670_s_register,
1491 #endif
1492 };
1493
1494 static const struct v4l2_subdev_video_ops ov7670_video_ops = {
1495 .enum_mbus_fmt = ov7670_enum_mbus_fmt,
1496 .try_mbus_fmt = ov7670_try_mbus_fmt,
1497 .s_mbus_fmt = ov7670_s_mbus_fmt,
1498 .s_parm = ov7670_s_parm,
1499 .g_parm = ov7670_g_parm,
1500 .enum_frameintervals = ov7670_enum_frameintervals,
1501 .enum_framesizes = ov7670_enum_framesizes,
1502 };
1503
1504 static const struct v4l2_subdev_ops ov7670_ops = {
1505 .core = &ov7670_core_ops,
1506 .video = &ov7670_video_ops,
1507 };
1508
1509 /* ----------------------------------------------------------------------- */
1510
1511 static const struct ov7670_devtype ov7670_devdata[] = {
1512 [MODEL_OV7670] = {
1513 .win_sizes = ov7670_win_sizes,
1514 .n_win_sizes = ARRAY_SIZE(ov7670_win_sizes),
1515 .set_framerate = ov7670_set_framerate_legacy,
1516 .get_framerate = ov7670_get_framerate_legacy,
1517 },
1518 [MODEL_OV7675] = {
1519 .win_sizes = ov7675_win_sizes,
1520 .n_win_sizes = ARRAY_SIZE(ov7675_win_sizes),
1521 .set_framerate = ov7675_set_framerate,
1522 .get_framerate = ov7675_get_framerate,
1523 },
1524 };
1525
1526 static int ov7670_probe(struct i2c_client *client,
1527 const struct i2c_device_id *id)
1528 {
1529 struct v4l2_fract tpf;
1530 struct v4l2_subdev *sd;
1531 struct ov7670_info *info;
1532 int ret;
1533
1534 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
1535 if (info == NULL)
1536 return -ENOMEM;
1537 sd = &info->sd;
1538 v4l2_i2c_subdev_init(sd, client, &ov7670_ops);
1539
1540 info->clock_speed = 30; /* default: a guess */
1541 if (client->dev.platform_data) {
1542 struct ov7670_config *config = client->dev.platform_data;
1543
1544 /*
1545 * Must apply configuration before initializing device, because it
1546 * selects I/O method.
1547 */
1548 info->min_width = config->min_width;
1549 info->min_height = config->min_height;
1550 info->use_smbus = config->use_smbus;
1551
1552 if (config->clock_speed)
1553 info->clock_speed = config->clock_speed;
1554
1555 /*
1556 * It should be allowed for ov7670 too when it is migrated to
1557 * the new frame rate formula.
1558 */
1559 if (config->pll_bypass && id->driver_data != MODEL_OV7670)
1560 info->pll_bypass = true;
1561
1562 if (config->pclk_hb_disable)
1563 info->pclk_hb_disable = true;
1564 }
1565
1566 /* Make sure it's an ov7670 */
1567 ret = ov7670_detect(sd);
1568 if (ret) {
1569 v4l_dbg(1, debug, client,
1570 "chip found @ 0x%x (%s) is not an ov7670 chip.\n",
1571 client->addr << 1, client->adapter->name);
1572 return ret;
1573 }
1574 v4l_info(client, "chip found @ 0x%02x (%s)\n",
1575 client->addr << 1, client->adapter->name);
1576
1577 info->devtype = &ov7670_devdata[id->driver_data];
1578 info->fmt = &ov7670_formats[0];
1579 info->clkrc = 0;
1580
1581 /* Set default frame rate to 30 fps */
1582 tpf.numerator = 1;
1583 tpf.denominator = 30;
1584 info->devtype->set_framerate(sd, &tpf);
1585
1586 if (info->pclk_hb_disable)
1587 ov7670_write(sd, REG_COM10, COM10_PCLK_HB);
1588
1589 v4l2_ctrl_handler_init(&info->hdl, 10);
1590 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1591 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
1592 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1593 V4L2_CID_CONTRAST, 0, 127, 1, 64);
1594 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1595 V4L2_CID_VFLIP, 0, 1, 1, 0);
1596 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1597 V4L2_CID_HFLIP, 0, 1, 1, 0);
1598 info->saturation = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1599 V4L2_CID_SATURATION, 0, 256, 1, 128);
1600 info->hue = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1601 V4L2_CID_HUE, -180, 180, 5, 0);
1602 info->gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1603 V4L2_CID_GAIN, 0, 255, 1, 128);
1604 info->auto_gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1605 V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
1606 info->exposure = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1607 V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
1608 info->auto_exposure = v4l2_ctrl_new_std_menu(&info->hdl, &ov7670_ctrl_ops,
1609 V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL, 0,
1610 V4L2_EXPOSURE_AUTO);
1611 sd->ctrl_handler = &info->hdl;
1612 if (info->hdl.error) {
1613 int err = info->hdl.error;
1614
1615 v4l2_ctrl_handler_free(&info->hdl);
1616 return err;
1617 }
1618 /*
1619 * We have checked empirically that hw allows to read back the gain
1620 * value chosen by auto gain but that's not the case for auto exposure.
1621 */
1622 v4l2_ctrl_auto_cluster(2, &info->auto_gain, 0, true);
1623 v4l2_ctrl_auto_cluster(2, &info->auto_exposure,
1624 V4L2_EXPOSURE_MANUAL, false);
1625 v4l2_ctrl_cluster(2, &info->saturation);
1626 v4l2_ctrl_handler_setup(&info->hdl);
1627
1628 return 0;
1629 }
1630
1631
1632 static int ov7670_remove(struct i2c_client *client)
1633 {
1634 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1635 struct ov7670_info *info = to_state(sd);
1636
1637 v4l2_device_unregister_subdev(sd);
1638 v4l2_ctrl_handler_free(&info->hdl);
1639 return 0;
1640 }
1641
1642 static const struct i2c_device_id ov7670_id[] = {
1643 { "ov7670", MODEL_OV7670 },
1644 { "ov7675", MODEL_OV7675 },
1645 { }
1646 };
1647 MODULE_DEVICE_TABLE(i2c, ov7670_id);
1648
1649 static struct i2c_driver ov7670_driver = {
1650 .driver = {
1651 .owner = THIS_MODULE,
1652 .name = "ov7670",
1653 },
1654 .probe = ov7670_probe,
1655 .remove = ov7670_remove,
1656 .id_table = ov7670_id,
1657 };
1658
1659 module_i2c_driver(ov7670_driver);
Linux kernel - Deliverables
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