?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ALSA: dice: fix kernel NULL pointer dereference due to invalid calculation for array...
[linux/fpc-iii.git] / drivers / media / i2c / ov7670.c
blob28571de1c2f6749797123704c0b2a617dc304088
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/clk.h>
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/i2c.h>
18 #include <linux/delay.h>
19 #include <linux/videodev2.h>
20 #include <linux/gpio.h>
21 #include <linux/gpio/consumer.h>
22 #include <media/v4l2-device.h>
23 #include <media/v4l2-ctrls.h>
24 #include <media/v4l2-mediabus.h>
25 #include <media/v4l2-image-sizes.h>
26 #include <media/i2c/ov7670.h>
27
28 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
29 MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
30 MODULE_LICENSE("GPL");
31
32 static bool debug;
33 module_param(debug, bool, 0644);
34 MODULE_PARM_DESC(debug, "Debug level (0-1)");
35
36 /*
37 * The 7670 sits on i2c with ID 0x42
38 */
39 #define OV7670_I2C_ADDR 0x42
40
41 #define PLL_FACTOR 4
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
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
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_DBLV 0x6b /* PLL control an debugging */
161 #define DBLV_BYPASS 0x00 /* Bypass PLL */
162 #define DBLV_X4 0x01 /* clock x4 */
163 #define DBLV_X6 0x10 /* clock x6 */
164 #define DBLV_X8 0x11 /* clock x8 */
165
166 #define REG_SCALING_XSC 0x70 /* Test pattern and horizontal scale factor */
167 #define TEST_PATTTERN_0 0x80
168 #define REG_SCALING_YSC 0x71 /* Test pattern and vertical scale factor */
169 #define TEST_PATTTERN_1 0x80
170
171 #define REG_REG76 0x76 /* OV's name */
172 #define R76_BLKPCOR 0x80 /* Black pixel correction enable */
173 #define R76_WHTPCOR 0x40 /* White pixel correction enable */
174
175 #define REG_RGB444 0x8c /* RGB 444 control */
176 #define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */
177 #define R444_RGBX 0x01 /* Empty nibble at end */
178
179 #define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */
180 #define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */
181
182 #define REG_BD50MAX 0xa5 /* 50hz banding step limit */
183 #define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */
184 #define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */
185 #define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */
186 #define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */
187 #define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
188 #define REG_BD60MAX 0xab /* 60hz banding step limit */
189
190 enum ov7670_model {
191 MODEL_OV7670 = 0,
192 MODEL_OV7675,
193 };
194
195 struct ov7670_win_size {
196 int width;
197 int height;
198 unsigned char com7_bit;
199 int hstart; /* Start/stop values for the camera. Note */
200 int hstop; /* that they do not always make complete */
201 int vstart; /* sense to humans, but evidently the sensor */
202 int vstop; /* will do the right thing... */
203 struct regval_list *regs; /* Regs to tweak */
204 };
205
206 struct ov7670_devtype {
207 /* formats supported for each model */
208 struct ov7670_win_size *win_sizes;
209 unsigned int n_win_sizes;
210 /* callbacks for frame rate control */
211 int (*set_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
212 void (*get_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
213 };
214
215 /*
216 * Information we maintain about a known sensor.
217 */
218 struct ov7670_format_struct; /* coming later */
219 struct ov7670_info {
220 struct v4l2_subdev sd;
221 #if defined(CONFIG_MEDIA_CONTROLLER)
222 struct media_pad pad;
223 #endif
224 struct v4l2_ctrl_handler hdl;
225 struct {
226 /* gain cluster */
227 struct v4l2_ctrl *auto_gain;
228 struct v4l2_ctrl *gain;
229 };
230 struct {
231 /* exposure cluster */
232 struct v4l2_ctrl *auto_exposure;
233 struct v4l2_ctrl *exposure;
234 };
235 struct {
236 /* saturation/hue cluster */
237 struct v4l2_ctrl *saturation;
238 struct v4l2_ctrl *hue;
239 };
240 struct v4l2_mbus_framefmt format;
241 struct ov7670_format_struct *fmt; /* Current format */
242 struct clk *clk;
243 struct gpio_desc *resetb_gpio;
244 struct gpio_desc *pwdn_gpio;
245 int min_width; /* Filter out smaller sizes */
246 int min_height; /* Filter out smaller sizes */
247 int clock_speed; /* External clock speed (MHz) */
248 u8 clkrc; /* Clock divider value */
249 bool use_smbus; /* Use smbus I/O instead of I2C */
250 bool pll_bypass;
251 bool pclk_hb_disable;
252 const struct ov7670_devtype *devtype; /* Device specifics */
253 };
254
255 static inline struct ov7670_info *to_state(struct v4l2_subdev *sd)
256 {
257 return container_of(sd, struct ov7670_info, sd);
258 }
259
260 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
261 {
262 return &container_of(ctrl->handler, struct ov7670_info, hdl)->sd;
263 }
264
265
266
267 /*
268 * The default register settings, as obtained from OmniVision. There
269 * is really no making sense of most of these - lots of "reserved" values
270 * and such.
271 *
272 * These settings give VGA YUYV.
273 */
274
275 struct regval_list {
276 unsigned char reg_num;
277 unsigned char value;
278 };
279
280 static struct regval_list ov7670_default_regs[] = {
281 { REG_COM7, COM7_RESET },
282 /*
283 * Clock scale: 3 = 15fps
284 * 2 = 20fps
285 * 1 = 30fps
286 */
287 { REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */
288 { REG_TSLB, 0x04 }, /* OV */
289 { REG_COM7, 0 }, /* VGA */
290 /*
291 * Set the hardware window. These values from OV don't entirely
292 * make sense - hstop is less than hstart. But they work...
293 */
294 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
295 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
296 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },
297
298 { REG_COM3, 0 }, { REG_COM14, 0 },
299 /* Mystery scaling numbers */
300 { REG_SCALING_XSC, 0x3a },
301 { REG_SCALING_YSC, 0x35 },
302 { 0x72, 0x11 }, { 0x73, 0xf0 },
303 { 0xa2, 0x02 }, { REG_COM10, 0x0 },
304
305 /* Gamma curve values */
306 { 0x7a, 0x20 }, { 0x7b, 0x10 },
307 { 0x7c, 0x1e }, { 0x7d, 0x35 },
308 { 0x7e, 0x5a }, { 0x7f, 0x69 },
309 { 0x80, 0x76 }, { 0x81, 0x80 },
310 { 0x82, 0x88 }, { 0x83, 0x8f },
311 { 0x84, 0x96 }, { 0x85, 0xa3 },
312 { 0x86, 0xaf }, { 0x87, 0xc4 },
313 { 0x88, 0xd7 }, { 0x89, 0xe8 },
314
315 /* AGC and AEC parameters. Note we start by disabling those features,
316 then turn them only after tweaking the values. */
317 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
318 { REG_GAIN, 0 }, { REG_AECH, 0 },
319 { REG_COM4, 0x40 }, /* magic reserved bit */
320 { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
321 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
322 { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
323 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
324 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */
325 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
326 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
327 { REG_HAECC7, 0x94 },
328 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
329
330 /* Almost all of these are magic "reserved" values. */
331 { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
332 { 0x16, 0x02 }, { REG_MVFP, 0x07 },
333 { 0x21, 0x02 }, { 0x22, 0x91 },
334 { 0x29, 0x07 }, { 0x33, 0x0b },
335 { 0x35, 0x0b }, { 0x37, 0x1d },
336 { 0x38, 0x71 }, { 0x39, 0x2a },
337 { REG_COM12, 0x78 }, { 0x4d, 0x40 },
338 { 0x4e, 0x20 }, { REG_GFIX, 0 },
339 { 0x6b, 0x4a }, { 0x74, 0x10 },
340 { 0x8d, 0x4f }, { 0x8e, 0 },
341 { 0x8f, 0 }, { 0x90, 0 },
342 { 0x91, 0 }, { 0x96, 0 },
343 { 0x9a, 0 }, { 0xb0, 0x84 },
344 { 0xb1, 0x0c }, { 0xb2, 0x0e },
345 { 0xb3, 0x82 }, { 0xb8, 0x0a },
346
347 /* More reserved magic, some of which tweaks white balance */
348 { 0x43, 0x0a }, { 0x44, 0xf0 },
349 { 0x45, 0x34 }, { 0x46, 0x58 },
350 { 0x47, 0x28 }, { 0x48, 0x3a },
351 { 0x59, 0x88 }, { 0x5a, 0x88 },
352 { 0x5b, 0x44 }, { 0x5c, 0x67 },
353 { 0x5d, 0x49 }, { 0x5e, 0x0e },
354 { 0x6c, 0x0a }, { 0x6d, 0x55 },
355 { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */
356 { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
357 { REG_RED, 0x60 },
358 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
359
360 /* Matrix coefficients */
361 { 0x4f, 0x80 }, { 0x50, 0x80 },
362 { 0x51, 0 }, { 0x52, 0x22 },
363 { 0x53, 0x5e }, { 0x54, 0x80 },
364 { 0x58, 0x9e },
365
366 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
367 { 0x75, 0x05 }, { 0x76, 0xe1 },
368 { 0x4c, 0 }, { 0x77, 0x01 },
369 { REG_COM13, 0xc3 }, { 0x4b, 0x09 },
370 { 0xc9, 0x60 }, { REG_COM16, 0x38 },
371 { 0x56, 0x40 },
372
373 { 0x34, 0x11 }, { REG_COM11, COM11_EXP|COM11_HZAUTO },
374 { 0xa4, 0x88 }, { 0x96, 0 },
375 { 0x97, 0x30 }, { 0x98, 0x20 },
376 { 0x99, 0x30 }, { 0x9a, 0x84 },
377 { 0x9b, 0x29 }, { 0x9c, 0x03 },
378 { 0x9d, 0x4c }, { 0x9e, 0x3f },
379 { 0x78, 0x04 },
380
381 /* Extra-weird stuff. Some sort of multiplexor register */
382 { 0x79, 0x01 }, { 0xc8, 0xf0 },
383 { 0x79, 0x0f }, { 0xc8, 0x00 },
384 { 0x79, 0x10 }, { 0xc8, 0x7e },
385 { 0x79, 0x0a }, { 0xc8, 0x80 },
386 { 0x79, 0x0b }, { 0xc8, 0x01 },
387 { 0x79, 0x0c }, { 0xc8, 0x0f },
388 { 0x79, 0x0d }, { 0xc8, 0x20 },
389 { 0x79, 0x09 }, { 0xc8, 0x80 },
390 { 0x79, 0x02 }, { 0xc8, 0xc0 },
391 { 0x79, 0x03 }, { 0xc8, 0x40 },
392 { 0x79, 0x05 }, { 0xc8, 0x30 },
393 { 0x79, 0x26 },
394
395 { 0xff, 0xff }, /* END MARKER */
396 };
397
398
399 /*
400 * Here we'll try to encapsulate the changes for just the output
401 * video format.
402 *
403 * RGB656 and YUV422 come from OV; RGB444 is homebrewed.
404 *
405 * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why.
406 */
407
408
409 static struct regval_list ov7670_fmt_yuv422[] = {
410 { REG_COM7, 0x0 }, /* Selects YUV mode */
411 { REG_RGB444, 0 }, /* No RGB444 please */
412 { REG_COM1, 0 }, /* CCIR601 */
413 { REG_COM15, COM15_R00FF },
414 { REG_COM9, 0x48 }, /* 32x gain ceiling; 0x8 is reserved bit */
415 { 0x4f, 0x80 }, /* "matrix coefficient 1" */
416 { 0x50, 0x80 }, /* "matrix coefficient 2" */
417 { 0x51, 0 }, /* vb */
418 { 0x52, 0x22 }, /* "matrix coefficient 4" */
419 { 0x53, 0x5e }, /* "matrix coefficient 5" */
420 { 0x54, 0x80 }, /* "matrix coefficient 6" */
421 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
422 { 0xff, 0xff },
423 };
424
425 static struct regval_list ov7670_fmt_rgb565[] = {
426 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
427 { REG_RGB444, 0 }, /* No RGB444 please */
428 { REG_COM1, 0x0 }, /* CCIR601 */
429 { REG_COM15, COM15_RGB565 },
430 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
431 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
432 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
433 { 0x51, 0 }, /* vb */
434 { 0x52, 0x3d }, /* "matrix coefficient 4" */
435 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
436 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
437 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
438 { 0xff, 0xff },
439 };
440
441 static struct regval_list ov7670_fmt_rgb444[] = {
442 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
443 { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */
444 { REG_COM1, 0x0 }, /* CCIR601 */
445 { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */
446 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
447 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
448 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
449 { 0x51, 0 }, /* vb */
450 { 0x52, 0x3d }, /* "matrix coefficient 4" */
451 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
452 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
453 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */
454 { 0xff, 0xff },
455 };
456
457 static struct regval_list ov7670_fmt_raw[] = {
458 { REG_COM7, COM7_BAYER },
459 { REG_COM13, 0x08 }, /* No gamma, magic rsvd bit */
460 { REG_COM16, 0x3d }, /* Edge enhancement, denoise */
461 { REG_REG76, 0xe1 }, /* Pix correction, magic rsvd */
462 { 0xff, 0xff },
463 };
464
465
466
467 /*
468 * Low-level register I/O.
469 *
470 * Note that there are two versions of these. On the XO 1, the
471 * i2c controller only does SMBUS, so that's what we use. The
472 * ov7670 is not really an SMBUS device, though, so the communication
473 * is not always entirely reliable.
474 */
475 static int ov7670_read_smbus(struct v4l2_subdev *sd, unsigned char reg,
476 unsigned char *value)
477 {
478 struct i2c_client *client = v4l2_get_subdevdata(sd);
479 int ret;
480
481 ret = i2c_smbus_read_byte_data(client, reg);
482 if (ret >= 0) {
483 *value = (unsigned char)ret;
484 ret = 0;
485 }
486 return ret;
487 }
488
489
490 static int ov7670_write_smbus(struct v4l2_subdev *sd, unsigned char reg,
491 unsigned char value)
492 {
493 struct i2c_client *client = v4l2_get_subdevdata(sd);
494 int ret = i2c_smbus_write_byte_data(client, reg, value);
495
496 if (reg == REG_COM7 && (value & COM7_RESET))
497 msleep(5); /* Wait for reset to run */
498 return ret;
499 }
500
501 /*
502 * On most platforms, we'd rather do straight i2c I/O.
503 */
504 static int ov7670_read_i2c(struct v4l2_subdev *sd, unsigned char reg,
505 unsigned char *value)
506 {
507 struct i2c_client *client = v4l2_get_subdevdata(sd);
508 u8 data = reg;
509 struct i2c_msg msg;
510 int ret;
511
512 /*
513 * Send out the register address...
514 */
515 msg.addr = client->addr;
516 msg.flags = 0;
517 msg.len = 1;
518 msg.buf = &data;
519 ret = i2c_transfer(client->adapter, &msg, 1);
520 if (ret < 0) {
521 printk(KERN_ERR "Error %d on register write\n", ret);
522 return ret;
523 }
524 /*
525 * ...then read back the result.
526 */
527 msg.flags = I2C_M_RD;
528 ret = i2c_transfer(client->adapter, &msg, 1);
529 if (ret >= 0) {
530 *value = data;
531 ret = 0;
532 }
533 return ret;
534 }
535
536
537 static int ov7670_write_i2c(struct v4l2_subdev *sd, unsigned char reg,
538 unsigned char value)
539 {
540 struct i2c_client *client = v4l2_get_subdevdata(sd);
541 struct i2c_msg msg;
542 unsigned char data[2] = { reg, value };
543 int ret;
544
545 msg.addr = client->addr;
546 msg.flags = 0;
547 msg.len = 2;
548 msg.buf = data;
549 ret = i2c_transfer(client->adapter, &msg, 1);
550 if (ret > 0)
551 ret = 0;
552 if (reg == REG_COM7 && (value & COM7_RESET))
553 msleep(5); /* Wait for reset to run */
554 return ret;
555 }
556
557 static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
558 unsigned char *value)
559 {
560 struct ov7670_info *info = to_state(sd);
561 if (info->use_smbus)
562 return ov7670_read_smbus(sd, reg, value);
563 else
564 return ov7670_read_i2c(sd, reg, value);
565 }
566
567 static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
568 unsigned char value)
569 {
570 struct ov7670_info *info = to_state(sd);
571 if (info->use_smbus)
572 return ov7670_write_smbus(sd, reg, value);
573 else
574 return ov7670_write_i2c(sd, reg, value);
575 }
576
577 static int ov7670_update_bits(struct v4l2_subdev *sd, unsigned char reg,
578 unsigned char mask, unsigned char value)
579 {
580 unsigned char orig;
581 int ret;
582
583 ret = ov7670_read(sd, reg, &orig);
584 if (ret)
585 return ret;
586
587 return ov7670_write(sd, reg, (orig & ~mask) | (value & mask));
588 }
589
590 /*
591 * Write a list of register settings; ff/ff stops the process.
592 */
593 static int ov7670_write_array(struct v4l2_subdev *sd, struct regval_list *vals)
594 {
595 while (vals->reg_num != 0xff || vals->value != 0xff) {
596 int ret = ov7670_write(sd, vals->reg_num, vals->value);
597 if (ret < 0)
598 return ret;
599 vals++;
600 }
601 return 0;
602 }
603
604
605 /*
606 * Stuff that knows about the sensor.
607 */
608 static int ov7670_reset(struct v4l2_subdev *sd, u32 val)
609 {
610 ov7670_write(sd, REG_COM7, COM7_RESET);
611 msleep(1);
612 return 0;
613 }
614
615
616 static int ov7670_init(struct v4l2_subdev *sd, u32 val)
617 {
618 return ov7670_write_array(sd, ov7670_default_regs);
619 }
620
621 static int ov7670_detect(struct v4l2_subdev *sd)
622 {
623 unsigned char v;
624 int ret;
625
626 ret = ov7670_init(sd, 0);
627 if (ret < 0)
628 return ret;
629 ret = ov7670_read(sd, REG_MIDH, &v);
630 if (ret < 0)
631 return ret;
632 if (v != 0x7f) /* OV manuf. id. */
633 return -ENODEV;
634 ret = ov7670_read(sd, REG_MIDL, &v);
635 if (ret < 0)
636 return ret;
637 if (v != 0xa2)
638 return -ENODEV;
639 /*
640 * OK, we know we have an OmniVision chip...but which one?
641 */
642 ret = ov7670_read(sd, REG_PID, &v);
643 if (ret < 0)
644 return ret;
645 if (v != 0x76) /* PID + VER = 0x76 / 0x73 */
646 return -ENODEV;
647 ret = ov7670_read(sd, REG_VER, &v);
648 if (ret < 0)
649 return ret;
650 if (v != 0x73) /* PID + VER = 0x76 / 0x73 */
651 return -ENODEV;
652 return 0;
653 }
654
655
656 /*
657 * Store information about the video data format. The color matrix
658 * is deeply tied into the format, so keep the relevant values here.
659 * The magic matrix numbers come from OmniVision.
660 */
661 static struct ov7670_format_struct {
662 u32 mbus_code;
663 enum v4l2_colorspace colorspace;
664 struct regval_list *regs;
665 int cmatrix[CMATRIX_LEN];
666 } ov7670_formats[] = {
667 {
668 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
669 .colorspace = V4L2_COLORSPACE_SRGB,
670 .regs = ov7670_fmt_yuv422,
671 .cmatrix = { 128, -128, 0, -34, -94, 128 },
672 },
673 {
674 .mbus_code = MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE,
675 .colorspace = V4L2_COLORSPACE_SRGB,
676 .regs = ov7670_fmt_rgb444,
677 .cmatrix = { 179, -179, 0, -61, -176, 228 },
678 },
679 {
680 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
681 .colorspace = V4L2_COLORSPACE_SRGB,
682 .regs = ov7670_fmt_rgb565,
683 .cmatrix = { 179, -179, 0, -61, -176, 228 },
684 },
685 {
686 .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
687 .colorspace = V4L2_COLORSPACE_SRGB,
688 .regs = ov7670_fmt_raw,
689 .cmatrix = { 0, 0, 0, 0, 0, 0 },
690 },
691 };
692 #define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats)
693
694
695 /*
696 * Then there is the issue of window sizes. Try to capture the info here.
697 */
698
699 /*
700 * QCIF mode is done (by OV) in a very strange way - it actually looks like
701 * VGA with weird scaling options - they do *not* use the canned QCIF mode
702 * which is allegedly provided by the sensor. So here's the weird register
703 * settings.
704 */
705 static struct regval_list ov7670_qcif_regs[] = {
706 { REG_COM3, COM3_SCALEEN|COM3_DCWEN },
707 { REG_COM3, COM3_DCWEN },
708 { REG_COM14, COM14_DCWEN | 0x01},
709 { 0x73, 0xf1 },
710 { 0xa2, 0x52 },
711 { 0x7b, 0x1c },
712 { 0x7c, 0x28 },
713 { 0x7d, 0x3c },
714 { 0x7f, 0x69 },
715 { REG_COM9, 0x38 },
716 { 0xa1, 0x0b },
717 { 0x74, 0x19 },
718 { 0x9a, 0x80 },
719 { 0x43, 0x14 },
720 { REG_COM13, 0xc0 },
721 { 0xff, 0xff },
722 };
723
724 static struct ov7670_win_size ov7670_win_sizes[] = {
725 /* VGA */
726 {
727 .width = VGA_WIDTH,
728 .height = VGA_HEIGHT,
729 .com7_bit = COM7_FMT_VGA,
730 .hstart = 158, /* These values from */
731 .hstop = 14, /* Omnivision */
732 .vstart = 10,
733 .vstop = 490,
734 .regs = NULL,
735 },
736 /* CIF */
737 {
738 .width = CIF_WIDTH,
739 .height = CIF_HEIGHT,
740 .com7_bit = COM7_FMT_CIF,
741 .hstart = 170, /* Empirically determined */
742 .hstop = 90,
743 .vstart = 14,
744 .vstop = 494,
745 .regs = NULL,
746 },
747 /* QVGA */
748 {
749 .width = QVGA_WIDTH,
750 .height = QVGA_HEIGHT,
751 .com7_bit = COM7_FMT_QVGA,
752 .hstart = 168, /* Empirically determined */
753 .hstop = 24,
754 .vstart = 12,
755 .vstop = 492,
756 .regs = NULL,
757 },
758 /* QCIF */
759 {
760 .width = QCIF_WIDTH,
761 .height = QCIF_HEIGHT,
762 .com7_bit = COM7_FMT_VGA, /* see comment above */
763 .hstart = 456, /* Empirically determined */
764 .hstop = 24,
765 .vstart = 14,
766 .vstop = 494,
767 .regs = ov7670_qcif_regs,
768 }
769 };
770
771 static struct ov7670_win_size ov7675_win_sizes[] = {
772 /*
773 * Currently, only VGA is supported. Theoretically it could be possible
774 * to support CIF, QVGA and QCIF too. Taking values for ov7670 as a
775 * base and tweak them empirically could be required.
776 */
777 {
778 .width = VGA_WIDTH,
779 .height = VGA_HEIGHT,
780 .com7_bit = COM7_FMT_VGA,
781 .hstart = 158, /* These values from */
782 .hstop = 14, /* Omnivision */
783 .vstart = 14, /* Empirically determined */
784 .vstop = 494,
785 .regs = NULL,
786 }
787 };
788
789 static void ov7675_get_framerate(struct v4l2_subdev *sd,
790 struct v4l2_fract *tpf)
791 {
792 struct ov7670_info *info = to_state(sd);
793 u32 clkrc = info->clkrc;
794 int pll_factor;
795
796 if (info->pll_bypass)
797 pll_factor = 1;
798 else
799 pll_factor = PLL_FACTOR;
800
801 clkrc++;
802 if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
803 clkrc = (clkrc >> 1);
804
805 tpf->numerator = 1;
806 tpf->denominator = (5 * pll_factor * info->clock_speed) /
807 (4 * clkrc);
808 }
809
810 static int ov7675_set_framerate(struct v4l2_subdev *sd,
811 struct v4l2_fract *tpf)
812 {
813 struct ov7670_info *info = to_state(sd);
814 u32 clkrc;
815 int pll_factor;
816 int ret;
817
818 /*
819 * The formula is fps = 5/4*pixclk for YUV/RGB and
820 * fps = 5/2*pixclk for RAW.
821 *
822 * pixclk = clock_speed / (clkrc + 1) * PLLfactor
823 *
824 */
825 if (info->pll_bypass) {
826 pll_factor = 1;
827 ret = ov7670_write(sd, REG_DBLV, DBLV_BYPASS);
828 } else {
829 pll_factor = PLL_FACTOR;
830 ret = ov7670_write(sd, REG_DBLV, DBLV_X4);
831 }
832 if (ret < 0)
833 return ret;
834
835 if (tpf->numerator == 0 || tpf->denominator == 0) {
836 clkrc = 0;
837 } else {
838 clkrc = (5 * pll_factor * info->clock_speed * tpf->numerator) /
839 (4 * tpf->denominator);
840 if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
841 clkrc = (clkrc << 1);
842 clkrc--;
843 }
844
845 /*
846 * The datasheet claims that clkrc = 0 will divide the input clock by 1
847 * but we've checked with an oscilloscope that it divides by 2 instead.
848 * So, if clkrc = 0 just bypass the divider.
849 */
850 if (clkrc <= 0)
851 clkrc = CLK_EXT;
852 else if (clkrc > CLK_SCALE)
853 clkrc = CLK_SCALE;
854 info->clkrc = clkrc;
855
856 /* Recalculate frame rate */
857 ov7675_get_framerate(sd, tpf);
858
859 ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
860 if (ret < 0)
861 return ret;
862
863 return ov7670_write(sd, REG_DBLV, DBLV_X4);
864 }
865
866 static void ov7670_get_framerate_legacy(struct v4l2_subdev *sd,
867 struct v4l2_fract *tpf)
868 {
869 struct ov7670_info *info = to_state(sd);
870
871 tpf->numerator = 1;
872 tpf->denominator = info->clock_speed;
873 if ((info->clkrc & CLK_EXT) == 0 && (info->clkrc & CLK_SCALE) > 1)
874 tpf->denominator /= (info->clkrc & CLK_SCALE);
875 }
876
877 static int ov7670_set_framerate_legacy(struct v4l2_subdev *sd,
878 struct v4l2_fract *tpf)
879 {
880 struct ov7670_info *info = to_state(sd);
881 int div;
882
883 if (tpf->numerator == 0 || tpf->denominator == 0)
884 div = 1; /* Reset to full rate */
885 else
886 div = (tpf->numerator * info->clock_speed) / tpf->denominator;
887 if (div == 0)
888 div = 1;
889 else if (div > CLK_SCALE)
890 div = CLK_SCALE;
891 info->clkrc = (info->clkrc & 0x80) | div;
892 tpf->numerator = 1;
893 tpf->denominator = info->clock_speed / div;
894 return ov7670_write(sd, REG_CLKRC, info->clkrc);
895 }
896
897 /*
898 * Store a set of start/stop values into the camera.
899 */
900 static int ov7670_set_hw(struct v4l2_subdev *sd, int hstart, int hstop,
901 int vstart, int vstop)
902 {
903 int ret;
904 unsigned char v;
905 /*
906 * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of
907 * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is
908 * a mystery "edge offset" value in the top two bits of href.
909 */
910 ret = ov7670_write(sd, REG_HSTART, (hstart >> 3) & 0xff);
911 ret += ov7670_write(sd, REG_HSTOP, (hstop >> 3) & 0xff);
912 ret += ov7670_read(sd, REG_HREF, &v);
913 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
914 msleep(10);
915 ret += ov7670_write(sd, REG_HREF, v);
916 /*
917 * Vertical: similar arrangement, but only 10 bits.
918 */
919 ret += ov7670_write(sd, REG_VSTART, (vstart >> 2) & 0xff);
920 ret += ov7670_write(sd, REG_VSTOP, (vstop >> 2) & 0xff);
921 ret += ov7670_read(sd, REG_VREF, &v);
922 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
923 msleep(10);
924 ret += ov7670_write(sd, REG_VREF, v);
925 return ret;
926 }
927
928
929 static int ov7670_enum_mbus_code(struct v4l2_subdev *sd,
930 struct v4l2_subdev_pad_config *cfg,
931 struct v4l2_subdev_mbus_code_enum *code)
932 {
933 if (code->pad || code->index >= N_OV7670_FMTS)
934 return -EINVAL;
935
936 code->code = ov7670_formats[code->index].mbus_code;
937 return 0;
938 }
939
940 static int ov7670_try_fmt_internal(struct v4l2_subdev *sd,
941 struct v4l2_mbus_framefmt *fmt,
942 struct ov7670_format_struct **ret_fmt,
943 struct ov7670_win_size **ret_wsize)
944 {
945 int index, i;
946 struct ov7670_win_size *wsize;
947 struct ov7670_info *info = to_state(sd);
948 unsigned int n_win_sizes = info->devtype->n_win_sizes;
949 unsigned int win_sizes_limit = n_win_sizes;
950
951 for (index = 0; index < N_OV7670_FMTS; index++)
952 if (ov7670_formats[index].mbus_code == fmt->code)
953 break;
954 if (index >= N_OV7670_FMTS) {
955 /* default to first format */
956 index = 0;
957 fmt->code = ov7670_formats[0].mbus_code;
958 }
959 if (ret_fmt != NULL)
960 *ret_fmt = ov7670_formats + index;
961 /*
962 * Fields: the OV devices claim to be progressive.
963 */
964 fmt->field = V4L2_FIELD_NONE;
965
966 /*
967 * Don't consider values that don't match min_height and min_width
968 * constraints.
969 */
970 if (info->min_width || info->min_height)
971 for (i = 0; i < n_win_sizes; i++) {
972 wsize = info->devtype->win_sizes + i;
973
974 if (wsize->width < info->min_width ||
975 wsize->height < info->min_height) {
976 win_sizes_limit = i;
977 break;
978 }
979 }
980 /*
981 * Round requested image size down to the nearest
982 * we support, but not below the smallest.
983 */
984 for (wsize = info->devtype->win_sizes;
985 wsize < info->devtype->win_sizes + win_sizes_limit; wsize++)
986 if (fmt->width >= wsize->width && fmt->height >= wsize->height)
987 break;
988 if (wsize >= info->devtype->win_sizes + win_sizes_limit)
989 wsize--; /* Take the smallest one */
990 if (ret_wsize != NULL)
991 *ret_wsize = wsize;
992 /*
993 * Note the size we'll actually handle.
994 */
995 fmt->width = wsize->width;
996 fmt->height = wsize->height;
997 fmt->colorspace = ov7670_formats[index].colorspace;
998
999 info->format = *fmt;
1000
1001 return 0;
1002 }
1003
1004 /*
1005 * Set a format.
1006 */
1007 static int ov7670_set_fmt(struct v4l2_subdev *sd,
1008 struct v4l2_subdev_pad_config *cfg,
1009 struct v4l2_subdev_format *format)
1010 {
1011 struct ov7670_format_struct *ovfmt;
1012 struct ov7670_win_size *wsize;
1013 struct ov7670_info *info = to_state(sd);
1014 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1015 struct v4l2_mbus_framefmt *mbus_fmt;
1016 #endif
1017 unsigned char com7;
1018 int ret;
1019
1020 if (format->pad)
1021 return -EINVAL;
1022
1023 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
1024 ret = ov7670_try_fmt_internal(sd, &format->format, NULL, NULL);
1025 if (ret)
1026 return ret;
1027 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1028 mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
1029 *mbus_fmt = format->format;
1030 return 0;
1031 #else
1032 return -ENOTTY;
1033 #endif
1034 }
1035
1036 ret = ov7670_try_fmt_internal(sd, &format->format, &ovfmt, &wsize);
1037
1038 if (ret)
1039 return ret;
1040 /*
1041 * COM7 is a pain in the ass, it doesn't like to be read then
1042 * quickly written afterward. But we have everything we need
1043 * to set it absolutely here, as long as the format-specific
1044 * register sets list it first.
1045 */
1046 com7 = ovfmt->regs[0].value;
1047 com7 |= wsize->com7_bit;
1048 ov7670_write(sd, REG_COM7, com7);
1049 /*
1050 * Now write the rest of the array. Also store start/stops
1051 */
1052 ov7670_write_array(sd, ovfmt->regs + 1);
1053 ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
1054 wsize->vstop);
1055 ret = 0;
1056 if (wsize->regs)
1057 ret = ov7670_write_array(sd, wsize->regs);
1058 info->fmt = ovfmt;
1059
1060 /*
1061 * If we're running RGB565, we must rewrite clkrc after setting
1062 * the other parameters or the image looks poor. If we're *not*
1063 * doing RGB565, we must not rewrite clkrc or the image looks
1064 * *really* poor.
1065 *
1066 * (Update) Now that we retain clkrc state, we should be able
1067 * to write it unconditionally, and that will make the frame
1068 * rate persistent too.
1069 */
1070 if (ret == 0)
1071 ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
1072 return 0;
1073 }
1074
1075 static int ov7670_get_fmt(struct v4l2_subdev *sd,
1076 struct v4l2_subdev_pad_config *cfg,
1077 struct v4l2_subdev_format *format)
1078 {
1079 struct ov7670_info *info = to_state(sd);
1080 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1081 struct v4l2_mbus_framefmt *mbus_fmt;
1082 #endif
1083
1084 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
1085 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1086 mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
1087 format->format = *mbus_fmt;
1088 return 0;
1089 #else
1090 return -ENOTTY;
1091 #endif
1092 } else {
1093 format->format = info->format;
1094 }
1095
1096 return 0;
1097 }
1098
1099 /*
1100 * Implement G/S_PARM. There is a "high quality" mode we could try
1101 * to do someday; for now, we just do the frame rate tweak.
1102 */
1103 static int ov7670_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
1104 {
1105 struct v4l2_captureparm *cp = &parms->parm.capture;
1106 struct ov7670_info *info = to_state(sd);
1107
1108 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1109 return -EINVAL;
1110
1111 cp->capability = V4L2_CAP_TIMEPERFRAME;
1112 info->devtype->get_framerate(sd, &cp->timeperframe);
1113
1114 return 0;
1115 }
1116
1117 static int ov7670_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
1118 {
1119 struct v4l2_captureparm *cp = &parms->parm.capture;
1120 struct v4l2_fract *tpf = &cp->timeperframe;
1121 struct ov7670_info *info = to_state(sd);
1122
1123 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1124 return -EINVAL;
1125
1126 cp->capability = V4L2_CAP_TIMEPERFRAME;
1127 return info->devtype->set_framerate(sd, tpf);
1128 }
1129
1130
1131 /*
1132 * Frame intervals. Since frame rates are controlled with the clock
1133 * divider, we can only do 30/n for integer n values. So no continuous
1134 * or stepwise options. Here we just pick a handful of logical values.
1135 */
1136
1137 static int ov7670_frame_rates[] = { 30, 15, 10, 5, 1 };
1138
1139 static int ov7670_enum_frame_interval(struct v4l2_subdev *sd,
1140 struct v4l2_subdev_pad_config *cfg,
1141 struct v4l2_subdev_frame_interval_enum *fie)
1142 {
1143 struct ov7670_info *info = to_state(sd);
1144 unsigned int n_win_sizes = info->devtype->n_win_sizes;
1145 int i;
1146
1147 if (fie->pad)
1148 return -EINVAL;
1149 if (fie->index >= ARRAY_SIZE(ov7670_frame_rates))
1150 return -EINVAL;
1151
1152 /*
1153 * Check if the width/height is valid.
1154 *
1155 * If a minimum width/height was requested, filter out the capture
1156 * windows that fall outside that.
1157 */
1158 for (i = 0; i < n_win_sizes; i++) {
1159 struct ov7670_win_size *win = &info->devtype->win_sizes[i];
1160
1161 if (info->min_width && win->width < info->min_width)
1162 continue;
1163 if (info->min_height && win->height < info->min_height)
1164 continue;
1165 if (fie->width == win->width && fie->height == win->height)
1166 break;
1167 }
1168 if (i == n_win_sizes)
1169 return -EINVAL;
1170 fie->interval.numerator = 1;
1171 fie->interval.denominator = ov7670_frame_rates[fie->index];
1172 return 0;
1173 }
1174
1175 /*
1176 * Frame size enumeration
1177 */
1178 static int ov7670_enum_frame_size(struct v4l2_subdev *sd,
1179 struct v4l2_subdev_pad_config *cfg,
1180 struct v4l2_subdev_frame_size_enum *fse)
1181 {
1182 struct ov7670_info *info = to_state(sd);
1183 int i;
1184 int num_valid = -1;
1185 __u32 index = fse->index;
1186 unsigned int n_win_sizes = info->devtype->n_win_sizes;
1187
1188 if (fse->pad)
1189 return -EINVAL;
1190
1191 /*
1192 * If a minimum width/height was requested, filter out the capture
1193 * windows that fall outside that.
1194 */
1195 for (i = 0; i < n_win_sizes; i++) {
1196 struct ov7670_win_size *win = &info->devtype->win_sizes[i];
1197 if (info->min_width && win->width < info->min_width)
1198 continue;
1199 if (info->min_height && win->height < info->min_height)
1200 continue;
1201 if (index == ++num_valid) {
1202 fse->min_width = fse->max_width = win->width;
1203 fse->min_height = fse->max_height = win->height;
1204 return 0;
1205 }
1206 }
1207
1208 return -EINVAL;
1209 }
1210
1211 /*
1212 * Code for dealing with controls.
1213 */
1214
1215 static int ov7670_store_cmatrix(struct v4l2_subdev *sd,
1216 int matrix[CMATRIX_LEN])
1217 {
1218 int i, ret;
1219 unsigned char signbits = 0;
1220
1221 /*
1222 * Weird crap seems to exist in the upper part of
1223 * the sign bits register, so let's preserve it.
1224 */
1225 ret = ov7670_read(sd, REG_CMATRIX_SIGN, &signbits);
1226 signbits &= 0xc0;
1227
1228 for (i = 0; i < CMATRIX_LEN; i++) {
1229 unsigned char raw;
1230
1231 if (matrix[i] < 0) {
1232 signbits |= (1 << i);
1233 if (matrix[i] < -255)
1234 raw = 0xff;
1235 else
1236 raw = (-1 * matrix[i]) & 0xff;
1237 }
1238 else {
1239 if (matrix[i] > 255)
1240 raw = 0xff;
1241 else
1242 raw = matrix[i] & 0xff;
1243 }
1244 ret += ov7670_write(sd, REG_CMATRIX_BASE + i, raw);
1245 }
1246 ret += ov7670_write(sd, REG_CMATRIX_SIGN, signbits);
1247 return ret;
1248 }
1249
1250
1251 /*
1252 * Hue also requires messing with the color matrix. It also requires
1253 * trig functions, which tend not to be well supported in the kernel.
1254 * So here is a simple table of sine values, 0-90 degrees, in steps
1255 * of five degrees. Values are multiplied by 1000.
1256 *
1257 * The following naive approximate trig functions require an argument
1258 * carefully limited to -180 <= theta <= 180.
1259 */
1260 #define SIN_STEP 5
1261 static const int ov7670_sin_table[] = {
1262 0, 87, 173, 258, 342, 422,
1263 499, 573, 642, 707, 766, 819,
1264 866, 906, 939, 965, 984, 996,
1265 1000
1266 };
1267
1268 static int ov7670_sine(int theta)
1269 {
1270 int chs = 1;
1271 int sine;
1272
1273 if (theta < 0) {
1274 theta = -theta;
1275 chs = -1;
1276 }
1277 if (theta <= 90)
1278 sine = ov7670_sin_table[theta/SIN_STEP];
1279 else {
1280 theta -= 90;
1281 sine = 1000 - ov7670_sin_table[theta/SIN_STEP];
1282 }
1283 return sine*chs;
1284 }
1285
1286 static int ov7670_cosine(int theta)
1287 {
1288 theta = 90 - theta;
1289 if (theta > 180)
1290 theta -= 360;
1291 else if (theta < -180)
1292 theta += 360;
1293 return ov7670_sine(theta);
1294 }
1295
1296
1297
1298
1299 static void ov7670_calc_cmatrix(struct ov7670_info *info,
1300 int matrix[CMATRIX_LEN], int sat, int hue)
1301 {
1302 int i;
1303 /*
1304 * Apply the current saturation setting first.
1305 */
1306 for (i = 0; i < CMATRIX_LEN; i++)
1307 matrix[i] = (info->fmt->cmatrix[i] * sat) >> 7;
1308 /*
1309 * Then, if need be, rotate the hue value.
1310 */
1311 if (hue != 0) {
1312 int sinth, costh, tmpmatrix[CMATRIX_LEN];
1313
1314 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
1315 sinth = ov7670_sine(hue);
1316 costh = ov7670_cosine(hue);
1317
1318 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000;
1319 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000;
1320 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000;
1321 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000;
1322 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000;
1323 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000;
1324 }
1325 }
1326
1327
1328
1329 static int ov7670_s_sat_hue(struct v4l2_subdev *sd, int sat, int hue)
1330 {
1331 struct ov7670_info *info = to_state(sd);
1332 int matrix[CMATRIX_LEN];
1333 int ret;
1334
1335 ov7670_calc_cmatrix(info, matrix, sat, hue);
1336 ret = ov7670_store_cmatrix(sd, matrix);
1337 return ret;
1338 }
1339
1340
1341 /*
1342 * Some weird registers seem to store values in a sign/magnitude format!
1343 */
1344
1345 static unsigned char ov7670_abs_to_sm(unsigned char v)
1346 {
1347 if (v > 127)
1348 return v & 0x7f;
1349 return (128 - v) | 0x80;
1350 }
1351
1352 static int ov7670_s_brightness(struct v4l2_subdev *sd, int value)
1353 {
1354 unsigned char com8 = 0, v;
1355 int ret;
1356
1357 ov7670_read(sd, REG_COM8, &com8);
1358 com8 &= ~COM8_AEC;
1359 ov7670_write(sd, REG_COM8, com8);
1360 v = ov7670_abs_to_sm(value);
1361 ret = ov7670_write(sd, REG_BRIGHT, v);
1362 return ret;
1363 }
1364
1365 static int ov7670_s_contrast(struct v4l2_subdev *sd, int value)
1366 {
1367 return ov7670_write(sd, REG_CONTRAS, (unsigned char) value);
1368 }
1369
1370 static int ov7670_s_hflip(struct v4l2_subdev *sd, int value)
1371 {
1372 unsigned char v = 0;
1373 int ret;
1374
1375 ret = ov7670_read(sd, REG_MVFP, &v);
1376 if (value)
1377 v |= MVFP_MIRROR;
1378 else
1379 v &= ~MVFP_MIRROR;
1380 msleep(10); /* FIXME */
1381 ret += ov7670_write(sd, REG_MVFP, v);
1382 return ret;
1383 }
1384
1385 static int ov7670_s_vflip(struct v4l2_subdev *sd, int value)
1386 {
1387 unsigned char v = 0;
1388 int ret;
1389
1390 ret = ov7670_read(sd, REG_MVFP, &v);
1391 if (value)
1392 v |= MVFP_FLIP;
1393 else
1394 v &= ~MVFP_FLIP;
1395 msleep(10); /* FIXME */
1396 ret += ov7670_write(sd, REG_MVFP, v);
1397 return ret;
1398 }
1399
1400 /*
1401 * GAIN is split between REG_GAIN and REG_VREF[7:6]. If one believes
1402 * the data sheet, the VREF parts should be the most significant, but
1403 * experience shows otherwise. There seems to be little value in
1404 * messing with the VREF bits, so we leave them alone.
1405 */
1406 static int ov7670_g_gain(struct v4l2_subdev *sd, __s32 *value)
1407 {
1408 int ret;
1409 unsigned char gain;
1410
1411 ret = ov7670_read(sd, REG_GAIN, &gain);
1412 *value = gain;
1413 return ret;
1414 }
1415
1416 static int ov7670_s_gain(struct v4l2_subdev *sd, int value)
1417 {
1418 int ret;
1419 unsigned char com8;
1420
1421 ret = ov7670_write(sd, REG_GAIN, value & 0xff);
1422 /* Have to turn off AGC as well */
1423 if (ret == 0) {
1424 ret = ov7670_read(sd, REG_COM8, &com8);
1425 ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AGC);
1426 }
1427 return ret;
1428 }
1429
1430 /*
1431 * Tweak autogain.
1432 */
1433 static int ov7670_s_autogain(struct v4l2_subdev *sd, int value)
1434 {
1435 int ret;
1436 unsigned char com8;
1437
1438 ret = ov7670_read(sd, REG_COM8, &com8);
1439 if (ret == 0) {
1440 if (value)
1441 com8 |= COM8_AGC;
1442 else
1443 com8 &= ~COM8_AGC;
1444 ret = ov7670_write(sd, REG_COM8, com8);
1445 }
1446 return ret;
1447 }
1448
1449 static int ov7670_s_exp(struct v4l2_subdev *sd, int value)
1450 {
1451 int ret;
1452 unsigned char com1, com8, aech, aechh;
1453
1454 ret = ov7670_read(sd, REG_COM1, &com1) +
1455 ov7670_read(sd, REG_COM8, &com8) +
1456 ov7670_read(sd, REG_AECHH, &aechh);
1457 if (ret)
1458 return ret;
1459
1460 com1 = (com1 & 0xfc) | (value & 0x03);
1461 aech = (value >> 2) & 0xff;
1462 aechh = (aechh & 0xc0) | ((value >> 10) & 0x3f);
1463 ret = ov7670_write(sd, REG_COM1, com1) +
1464 ov7670_write(sd, REG_AECH, aech) +
1465 ov7670_write(sd, REG_AECHH, aechh);
1466 /* Have to turn off AEC as well */
1467 if (ret == 0)
1468 ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AEC);
1469 return ret;
1470 }
1471
1472 /*
1473 * Tweak autoexposure.
1474 */
1475 static int ov7670_s_autoexp(struct v4l2_subdev *sd,
1476 enum v4l2_exposure_auto_type value)
1477 {
1478 int ret;
1479 unsigned char com8;
1480
1481 ret = ov7670_read(sd, REG_COM8, &com8);
1482 if (ret == 0) {
1483 if (value == V4L2_EXPOSURE_AUTO)
1484 com8 |= COM8_AEC;
1485 else
1486 com8 &= ~COM8_AEC;
1487 ret = ov7670_write(sd, REG_COM8, com8);
1488 }
1489 return ret;
1490 }
1491
1492 static const char * const ov7670_test_pattern_menu[] = {
1493 "No test output",
1494 "Shifting \"1\"",
1495 "8-bar color bar",
1496 "Fade to gray color bar",
1497 };
1498
1499 static int ov7670_s_test_pattern(struct v4l2_subdev *sd, int value)
1500 {
1501 int ret;
1502
1503 ret = ov7670_update_bits(sd, REG_SCALING_XSC, TEST_PATTTERN_0,
1504 value & BIT(0) ? TEST_PATTTERN_0 : 0);
1505 if (ret)
1506 return ret;
1507
1508 return ov7670_update_bits(sd, REG_SCALING_YSC, TEST_PATTTERN_1,
1509 value & BIT(1) ? TEST_PATTTERN_1 : 0);
1510 }
1511
1512 static int ov7670_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
1513 {
1514 struct v4l2_subdev *sd = to_sd(ctrl);
1515 struct ov7670_info *info = to_state(sd);
1516
1517 switch (ctrl->id) {
1518 case V4L2_CID_AUTOGAIN:
1519 return ov7670_g_gain(sd, &info->gain->val);
1520 }
1521 return -EINVAL;
1522 }
1523
1524 static int ov7670_s_ctrl(struct v4l2_ctrl *ctrl)
1525 {
1526 struct v4l2_subdev *sd = to_sd(ctrl);
1527 struct ov7670_info *info = to_state(sd);
1528
1529 switch (ctrl->id) {
1530 case V4L2_CID_BRIGHTNESS:
1531 return ov7670_s_brightness(sd, ctrl->val);
1532 case V4L2_CID_CONTRAST:
1533 return ov7670_s_contrast(sd, ctrl->val);
1534 case V4L2_CID_SATURATION:
1535 return ov7670_s_sat_hue(sd,
1536 info->saturation->val, info->hue->val);
1537 case V4L2_CID_VFLIP:
1538 return ov7670_s_vflip(sd, ctrl->val);
1539 case V4L2_CID_HFLIP:
1540 return ov7670_s_hflip(sd, ctrl->val);
1541 case V4L2_CID_AUTOGAIN:
1542 /* Only set manual gain if auto gain is not explicitly
1543 turned on. */
1544 if (!ctrl->val) {
1545 /* ov7670_s_gain turns off auto gain */
1546 return ov7670_s_gain(sd, info->gain->val);
1547 }
1548 return ov7670_s_autogain(sd, ctrl->val);
1549 case V4L2_CID_EXPOSURE_AUTO:
1550 /* Only set manual exposure if auto exposure is not explicitly
1551 turned on. */
1552 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
1553 /* ov7670_s_exp turns off auto exposure */
1554 return ov7670_s_exp(sd, info->exposure->val);
1555 }
1556 return ov7670_s_autoexp(sd, ctrl->val);
1557 case V4L2_CID_TEST_PATTERN:
1558 return ov7670_s_test_pattern(sd, ctrl->val);
1559 }
1560 return -EINVAL;
1561 }
1562
1563 static const struct v4l2_ctrl_ops ov7670_ctrl_ops = {
1564 .s_ctrl = ov7670_s_ctrl,
1565 .g_volatile_ctrl = ov7670_g_volatile_ctrl,
1566 };
1567
1568 #ifdef CONFIG_VIDEO_ADV_DEBUG
1569 static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
1570 {
1571 unsigned char val = 0;
1572 int ret;
1573
1574 ret = ov7670_read(sd, reg->reg & 0xff, &val);
1575 reg->val = val;
1576 reg->size = 1;
1577 return ret;
1578 }
1579
1580 static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
1581 {
1582 ov7670_write(sd, reg->reg & 0xff, reg->val & 0xff);
1583 return 0;
1584 }
1585 #endif
1586
1587 static int ov7670_s_power(struct v4l2_subdev *sd, int on)
1588 {
1589 struct ov7670_info *info = to_state(sd);
1590
1591 if (info->pwdn_gpio)
1592 gpiod_set_value(info->pwdn_gpio, !on);
1593 if (on && info->resetb_gpio) {
1594 gpiod_set_value(info->resetb_gpio, 1);
1595 usleep_range(500, 1000);
1596 gpiod_set_value(info->resetb_gpio, 0);
1597 usleep_range(3000, 5000);
1598 }
1599
1600 return 0;
1601 }
1602
1603 static void ov7670_get_default_format(struct v4l2_subdev *sd,
1604 struct v4l2_mbus_framefmt *format)
1605 {
1606 struct ov7670_info *info = to_state(sd);
1607
1608 format->width = info->devtype->win_sizes[0].width;
1609 format->height = info->devtype->win_sizes[0].height;
1610 format->colorspace = info->fmt->colorspace;
1611 format->code = info->fmt->mbus_code;
1612 format->field = V4L2_FIELD_NONE;
1613 }
1614
1615 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1616 static int ov7670_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
1617 {
1618 struct v4l2_mbus_framefmt *format =
1619 v4l2_subdev_get_try_format(sd, fh->pad, 0);
1620
1621 ov7670_get_default_format(sd, format);
1622
1623 return 0;
1624 }
1625 #endif
1626
1627 /* ----------------------------------------------------------------------- */
1628
1629 static const struct v4l2_subdev_core_ops ov7670_core_ops = {
1630 .reset = ov7670_reset,
1631 .init = ov7670_init,
1632 #ifdef CONFIG_VIDEO_ADV_DEBUG
1633 .g_register = ov7670_g_register,
1634 .s_register = ov7670_s_register,
1635 #endif
1636 };
1637
1638 static const struct v4l2_subdev_video_ops ov7670_video_ops = {
1639 .s_parm = ov7670_s_parm,
1640 .g_parm = ov7670_g_parm,
1641 };
1642
1643 static const struct v4l2_subdev_pad_ops ov7670_pad_ops = {
1644 .enum_frame_interval = ov7670_enum_frame_interval,
1645 .enum_frame_size = ov7670_enum_frame_size,
1646 .enum_mbus_code = ov7670_enum_mbus_code,
1647 .get_fmt = ov7670_get_fmt,
1648 .set_fmt = ov7670_set_fmt,
1649 };
1650
1651 static const struct v4l2_subdev_ops ov7670_ops = {
1652 .core = &ov7670_core_ops,
1653 .video = &ov7670_video_ops,
1654 .pad = &ov7670_pad_ops,
1655 };
1656
1657 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1658 static const struct v4l2_subdev_internal_ops ov7670_subdev_internal_ops = {
1659 .open = ov7670_open,
1660 };
1661 #endif
1662
1663 /* ----------------------------------------------------------------------- */
1664
1665 static const struct ov7670_devtype ov7670_devdata[] = {
1666 [MODEL_OV7670] = {
1667 .win_sizes = ov7670_win_sizes,
1668 .n_win_sizes = ARRAY_SIZE(ov7670_win_sizes),
1669 .set_framerate = ov7670_set_framerate_legacy,
1670 .get_framerate = ov7670_get_framerate_legacy,
1671 },
1672 [MODEL_OV7675] = {
1673 .win_sizes = ov7675_win_sizes,
1674 .n_win_sizes = ARRAY_SIZE(ov7675_win_sizes),
1675 .set_framerate = ov7675_set_framerate,
1676 .get_framerate = ov7675_get_framerate,
1677 },
1678 };
1679
1680 static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info)
1681 {
1682 info->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
1683 GPIOD_OUT_LOW);
1684 if (IS_ERR(info->pwdn_gpio)) {
1685 dev_info(&client->dev, "can't get %s GPIO\n", "powerdown");
1686 return PTR_ERR(info->pwdn_gpio);
1687 }
1688
1689 info->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1690 GPIOD_OUT_LOW);
1691 if (IS_ERR(info->resetb_gpio)) {
1692 dev_info(&client->dev, "can't get %s GPIO\n", "reset");
1693 return PTR_ERR(info->resetb_gpio);
1694 }
1695
1696 usleep_range(3000, 5000);
1697
1698 return 0;
1699 }
1700
1701 static int ov7670_probe(struct i2c_client *client,
1702 const struct i2c_device_id *id)
1703 {
1704 struct v4l2_fract tpf;
1705 struct v4l2_subdev *sd;
1706 struct ov7670_info *info;
1707 int ret;
1708
1709 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
1710 if (info == NULL)
1711 return -ENOMEM;
1712 sd = &info->sd;
1713 v4l2_i2c_subdev_init(sd, client, &ov7670_ops);
1714
1715 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1716 sd->internal_ops = &ov7670_subdev_internal_ops;
1717 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1718 #endif
1719
1720 info->clock_speed = 30; /* default: a guess */
1721 if (client->dev.platform_data) {
1722 struct ov7670_config *config = client->dev.platform_data;
1723
1724 /*
1725 * Must apply configuration before initializing device, because it
1726 * selects I/O method.
1727 */
1728 info->min_width = config->min_width;
1729 info->min_height = config->min_height;
1730 info->use_smbus = config->use_smbus;
1731
1732 if (config->clock_speed)
1733 info->clock_speed = config->clock_speed;
1734
1735 /*
1736 * It should be allowed for ov7670 too when it is migrated to
1737 * the new frame rate formula.
1738 */
1739 if (config->pll_bypass && id->driver_data != MODEL_OV7670)
1740 info->pll_bypass = true;
1741
1742 if (config->pclk_hb_disable)
1743 info->pclk_hb_disable = true;
1744 }
1745
1746 info->clk = devm_clk_get(&client->dev, "xclk");
1747 if (IS_ERR(info->clk))
1748 return PTR_ERR(info->clk);
1749 ret = clk_prepare_enable(info->clk);
1750 if (ret)
1751 return ret;
1752
1753 info->clock_speed = clk_get_rate(info->clk) / 1000000;
1754 if (info->clock_speed < 10 || info->clock_speed > 48) {
1755 ret = -EINVAL;
1756 goto clk_disable;
1757 }
1758
1759 ret = ov7670_init_gpio(client, info);
1760 if (ret)
1761 goto clk_disable;
1762
1763 ov7670_s_power(sd, 1);
1764
1765 /* Make sure it's an ov7670 */
1766 ret = ov7670_detect(sd);
1767 if (ret) {
1768 v4l_dbg(1, debug, client,
1769 "chip found @ 0x%x (%s) is not an ov7670 chip.\n",
1770 client->addr << 1, client->adapter->name);
1771 goto power_off;
1772 }
1773 v4l_info(client, "chip found @ 0x%02x (%s)\n",
1774 client->addr << 1, client->adapter->name);
1775
1776 info->devtype = &ov7670_devdata[id->driver_data];
1777 info->fmt = &ov7670_formats[0];
1778
1779 ov7670_get_default_format(sd, &info->format);
1780
1781 info->clkrc = 0;
1782
1783 /* Set default frame rate to 30 fps */
1784 tpf.numerator = 1;
1785 tpf.denominator = 30;
1786 info->devtype->set_framerate(sd, &tpf);
1787
1788 if (info->pclk_hb_disable)
1789 ov7670_write(sd, REG_COM10, COM10_PCLK_HB);
1790
1791 v4l2_ctrl_handler_init(&info->hdl, 10);
1792 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1793 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
1794 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1795 V4L2_CID_CONTRAST, 0, 127, 1, 64);
1796 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1797 V4L2_CID_VFLIP, 0, 1, 1, 0);
1798 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1799 V4L2_CID_HFLIP, 0, 1, 1, 0);
1800 info->saturation = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1801 V4L2_CID_SATURATION, 0, 256, 1, 128);
1802 info->hue = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1803 V4L2_CID_HUE, -180, 180, 5, 0);
1804 info->gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1805 V4L2_CID_GAIN, 0, 255, 1, 128);
1806 info->auto_gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1807 V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
1808 info->exposure = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1809 V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
1810 info->auto_exposure = v4l2_ctrl_new_std_menu(&info->hdl, &ov7670_ctrl_ops,
1811 V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL, 0,
1812 V4L2_EXPOSURE_AUTO);
1813 v4l2_ctrl_new_std_menu_items(&info->hdl, &ov7670_ctrl_ops,
1814 V4L2_CID_TEST_PATTERN,
1815 ARRAY_SIZE(ov7670_test_pattern_menu) - 1, 0, 0,
1816 ov7670_test_pattern_menu);
1817 sd->ctrl_handler = &info->hdl;
1818 if (info->hdl.error) {
1819 ret = info->hdl.error;
1820
1821 goto hdl_free;
1822 }
1823 /*
1824 * We have checked empirically that hw allows to read back the gain
1825 * value chosen by auto gain but that's not the case for auto exposure.
1826 */
1827 v4l2_ctrl_auto_cluster(2, &info->auto_gain, 0, true);
1828 v4l2_ctrl_auto_cluster(2, &info->auto_exposure,
1829 V4L2_EXPOSURE_MANUAL, false);
1830 v4l2_ctrl_cluster(2, &info->saturation);
1831
1832 #if defined(CONFIG_MEDIA_CONTROLLER)
1833 info->pad.flags = MEDIA_PAD_FL_SOURCE;
1834 info->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
1835 ret = media_entity_pads_init(&info->sd.entity, 1, &info->pad);
1836 if (ret < 0)
1837 goto hdl_free;
1838 #endif
1839
1840 v4l2_ctrl_handler_setup(&info->hdl);
1841
1842 ret = v4l2_async_register_subdev(&info->sd);
1843 if (ret < 0)
1844 goto entity_cleanup;
1845
1846 return 0;
1847
1848 entity_cleanup:
1849 media_entity_cleanup(&info->sd.entity);
1850 hdl_free:
1851 v4l2_ctrl_handler_free(&info->hdl);
1852 power_off:
1853 ov7670_s_power(sd, 0);
1854 clk_disable:
1855 clk_disable_unprepare(info->clk);
1856 return ret;
1857 }
1858
1859
1860 static int ov7670_remove(struct i2c_client *client)
1861 {
1862 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1863 struct ov7670_info *info = to_state(sd);
1864
1865 v4l2_async_unregister_subdev(sd);
1866 v4l2_ctrl_handler_free(&info->hdl);
1867 clk_disable_unprepare(info->clk);
1868 media_entity_cleanup(&info->sd.entity);
1869 ov7670_s_power(sd, 0);
1870 return 0;
1871 }
1872
1873 static const struct i2c_device_id ov7670_id[] = {
1874 { "ov7670", MODEL_OV7670 },
1875 { "ov7675", MODEL_OV7675 },
1876 { }
1877 };
1878 MODULE_DEVICE_TABLE(i2c, ov7670_id);
1879
1880 #if IS_ENABLED(CONFIG_OF)
1881 static const struct of_device_id ov7670_of_match[] = {
1882 { .compatible = "ovti,ov7670", },
1883 { /* sentinel */ },
1884 };
1885 MODULE_DEVICE_TABLE(of, ov7670_of_match);
1886 #endif
1887
1888 static struct i2c_driver ov7670_driver = {
1889 .driver = {
1890 .name = "ov7670",
1891 .of_match_table = of_match_ptr(ov7670_of_match),
1892 },
1893 .probe = ov7670_probe,
1894 .remove = ov7670_remove,
1895 .id_table = ov7670_id,
1896 };
1897
1898 module_i2c_driver(ov7670_driver);
Linux with added FPC-III support