1 // SPDX-License-Identifier: GPL-2.0-only
3 * A V4L2 driver for OmniVision OV7670 cameras.
5 * Copyright 2006 One Laptop Per Child Association, Inc. Written
6 * by Jonathan Corbet with substantial inspiration from Mark
7 * McClelland's ovcamchip code.
9 * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
11 #include <linux/clk.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/i2c.h>
16 #include <linux/delay.h>
17 #include <linux/videodev2.h>
18 #include <linux/gpio/consumer.h>
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-event.h>
21 #include <media/v4l2-ctrls.h>
22 #include <media/v4l2-fwnode.h>
23 #include <media/v4l2-mediabus.h>
24 #include <media/v4l2-image-sizes.h>
25 #include <media/i2c/ov7670.h>
27 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
28 MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
29 MODULE_LICENSE("GPL");
32 module_param(debug, bool, 0644);
33 MODULE_PARM_DESC(debug, "Debug level (0-1)");
36 * The 7670 sits on i2c with ID 0x42
38 #define OV7670_I2C_ADDR 0x42
43 #define REG_GAIN 0x00 /* Gain lower 8 bits (rest in vref) */
44 #define REG_BLUE 0x01 /* blue gain */
45 #define REG_RED 0x02 /* red gain */
46 #define REG_VREF 0x03 /* Pieces of GAIN, VSTART, VSTOP */
47 #define REG_COM1 0x04 /* Control 1 */
48 #define COM1_CCIR656 0x40 /* CCIR656 enable */
49 #define REG_BAVE 0x05 /* U/B Average level */
50 #define REG_GbAVE 0x06 /* Y/Gb Average level */
51 #define REG_AECHH 0x07 /* AEC MS 5 bits */
52 #define REG_RAVE 0x08 /* V/R Average level */
53 #define REG_COM2 0x09 /* Control 2 */
54 #define COM2_SSLEEP 0x10 /* Soft sleep mode */
55 #define REG_PID 0x0a /* Product ID MSB */
56 #define REG_VER 0x0b /* Product ID LSB */
57 #define REG_COM3 0x0c /* Control 3 */
58 #define COM3_SWAP 0x40 /* Byte swap */
59 #define COM3_SCALEEN 0x08 /* Enable scaling */
60 #define COM3_DCWEN 0x04 /* Enable downsamp/crop/window */
61 #define REG_COM4 0x0d /* Control 4 */
62 #define REG_COM5 0x0e /* All "reserved" */
63 #define REG_COM6 0x0f /* Control 6 */
64 #define REG_AECH 0x10 /* More bits of AEC value */
65 #define REG_CLKRC 0x11 /* Clocl control */
66 #define CLK_EXT 0x40 /* Use external clock directly */
67 #define CLK_SCALE 0x3f /* Mask for internal clock scale */
68 #define REG_COM7 0x12 /* Control 7 */
69 #define COM7_RESET 0x80 /* Register reset */
70 #define COM7_FMT_MASK 0x38
71 #define COM7_FMT_VGA 0x00
72 #define COM7_FMT_CIF 0x20 /* CIF format */
73 #define COM7_FMT_QVGA 0x10 /* QVGA format */
74 #define COM7_FMT_QCIF 0x08 /* QCIF format */
75 #define COM7_RGB 0x04 /* bits 0 and 2 - RGB format */
76 #define COM7_YUV 0x00 /* YUV */
77 #define COM7_BAYER 0x01 /* Bayer format */
78 #define COM7_PBAYER 0x05 /* "Processed bayer" */
79 #define REG_COM8 0x13 /* Control 8 */
80 #define COM8_FASTAEC 0x80 /* Enable fast AGC/AEC */
81 #define COM8_AECSTEP 0x40 /* Unlimited AEC step size */
82 #define COM8_BFILT 0x20 /* Band filter enable */
83 #define COM8_AGC 0x04 /* Auto gain enable */
84 #define COM8_AWB 0x02 /* White balance enable */
85 #define COM8_AEC 0x01 /* Auto exposure enable */
86 #define REG_COM9 0x14 /* Control 9 - gain ceiling */
87 #define REG_COM10 0x15 /* Control 10 */
88 #define COM10_HSYNC 0x40 /* HSYNC instead of HREF */
89 #define COM10_PCLK_HB 0x20 /* Suppress PCLK on horiz blank */
90 #define COM10_HREF_REV 0x08 /* Reverse HREF */
91 #define COM10_VS_LEAD 0x04 /* VSYNC on clock leading edge */
92 #define COM10_VS_NEG 0x02 /* VSYNC negative */
93 #define COM10_HS_NEG 0x01 /* HSYNC negative */
94 #define REG_HSTART 0x17 /* Horiz start high bits */
95 #define REG_HSTOP 0x18 /* Horiz stop high bits */
96 #define REG_VSTART 0x19 /* Vert start high bits */
97 #define REG_VSTOP 0x1a /* Vert stop high bits */
98 #define REG_PSHFT 0x1b /* Pixel delay after HREF */
99 #define REG_MIDH 0x1c /* Manuf. ID high */
100 #define REG_MIDL 0x1d /* Manuf. ID low */
101 #define REG_MVFP 0x1e /* Mirror / vflip */
102 #define MVFP_MIRROR 0x20 /* Mirror image */
103 #define MVFP_FLIP 0x10 /* Vertical flip */
105 #define REG_AEW 0x24 /* AGC upper limit */
106 #define REG_AEB 0x25 /* AGC lower limit */
107 #define REG_VPT 0x26 /* AGC/AEC fast mode op region */
108 #define REG_HSYST 0x30 /* HSYNC rising edge delay */
109 #define REG_HSYEN 0x31 /* HSYNC falling edge delay */
110 #define REG_HREF 0x32 /* HREF pieces */
111 #define REG_TSLB 0x3a /* lots of stuff */
112 #define TSLB_YLAST 0x04 /* UYVY or VYUY - see com13 */
113 #define REG_COM11 0x3b /* Control 11 */
114 #define COM11_NIGHT 0x80 /* NIght mode enable */
115 #define COM11_NMFR 0x60 /* Two bit NM frame rate */
116 #define COM11_HZAUTO 0x10 /* Auto detect 50/60 Hz */
117 #define COM11_50HZ 0x08 /* Manual 50Hz select */
118 #define COM11_EXP 0x02
119 #define REG_COM12 0x3c /* Control 12 */
120 #define COM12_HREF 0x80 /* HREF always */
121 #define REG_COM13 0x3d /* Control 13 */
122 #define COM13_GAMMA 0x80 /* Gamma enable */
123 #define COM13_UVSAT 0x40 /* UV saturation auto adjustment */
124 #define COM13_UVSWAP 0x01 /* V before U - w/TSLB */
125 #define REG_COM14 0x3e /* Control 14 */
126 #define COM14_DCWEN 0x10 /* DCW/PCLK-scale enable */
127 #define REG_EDGE 0x3f /* Edge enhancement factor */
128 #define REG_COM15 0x40 /* Control 15 */
129 #define COM15_R10F0 0x00 /* Data range 10 to F0 */
130 #define COM15_R01FE 0x80 /* 01 to FE */
131 #define COM15_R00FF 0xc0 /* 00 to FF */
132 #define COM15_RGB565 0x10 /* RGB565 output */
133 #define COM15_RGB555 0x30 /* RGB555 output */
134 #define REG_COM16 0x41 /* Control 16 */
135 #define COM16_AWBGAIN 0x08 /* AWB gain enable */
136 #define REG_COM17 0x42 /* Control 17 */
137 #define COM17_AECWIN 0xc0 /* AEC window - must match COM4 */
138 #define COM17_CBAR 0x08 /* DSP Color bar */
141 * This matrix defines how the colors are generated, must be
142 * tweaked to adjust hue and saturation.
144 * Order: v-red, v-green, v-blue, u-red, u-green, u-blue
146 * They are nine-bit signed quantities, with the sign bit
147 * stored in 0x58. Sign for v-red is bit 0, and up from there.
149 #define REG_CMATRIX_BASE 0x4f
150 #define CMATRIX_LEN 6
151 #define REG_CMATRIX_SIGN 0x58
154 #define REG_BRIGHT 0x55 /* Brightness */
155 #define REG_CONTRAS 0x56 /* Contrast control */
157 #define REG_GFIX 0x69 /* Fix gain control */
159 #define REG_DBLV 0x6b /* PLL control an debugging */
160 #define DBLV_BYPASS 0x0a /* Bypass PLL */
161 #define DBLV_X4 0x4a /* clock x4 */
162 #define DBLV_X6 0x8a /* clock x6 */
163 #define DBLV_X8 0xca /* clock x8 */
165 #define REG_SCALING_XSC 0x70 /* Test pattern and horizontal scale factor */
166 #define TEST_PATTTERN_0 0x80
167 #define REG_SCALING_YSC 0x71 /* Test pattern and vertical scale factor */
168 #define TEST_PATTTERN_1 0x80
170 #define REG_REG76 0x76 /* OV's name */
171 #define R76_BLKPCOR 0x80 /* Black pixel correction enable */
172 #define R76_WHTPCOR 0x40 /* White pixel correction enable */
174 #define REG_RGB444 0x8c /* RGB 444 control */
175 #define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */
176 #define R444_RGBX 0x01 /* Empty nibble at end */
178 #define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */
179 #define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */
181 #define REG_BD50MAX 0xa5 /* 50hz banding step limit */
182 #define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */
183 #define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */
184 #define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */
185 #define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */
186 #define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
187 #define REG_BD60MAX 0xab /* 60hz banding step limit */
194 struct ov7670_win_size {
197 unsigned char com7_bit;
198 int hstart; /* Start/stop values for the camera. Note */
199 int hstop; /* that they do not always make complete */
200 int vstart; /* sense to humans, but evidently the sensor */
201 int vstop; /* will do the right thing... */
202 struct regval_list *regs; /* Regs to tweak */
205 struct ov7670_devtype {
206 /* formats supported for each model */
207 struct ov7670_win_size *win_sizes;
208 unsigned int n_win_sizes;
209 /* callbacks for frame rate control */
210 int (*set_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
211 void (*get_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
215 * Information we maintain about a known sensor.
217 struct ov7670_format_struct; /* coming later */
219 struct v4l2_subdev sd;
220 #if defined(CONFIG_MEDIA_CONTROLLER)
221 struct media_pad pad;
223 struct v4l2_ctrl_handler hdl;
226 struct v4l2_ctrl *auto_gain;
227 struct v4l2_ctrl *gain;
230 /* exposure cluster */
231 struct v4l2_ctrl *auto_exposure;
232 struct v4l2_ctrl *exposure;
235 /* saturation/hue cluster */
236 struct v4l2_ctrl *saturation;
237 struct v4l2_ctrl *hue;
239 struct v4l2_mbus_framefmt format;
240 struct ov7670_format_struct *fmt; /* Current format */
241 struct ov7670_win_size *wsize;
244 struct gpio_desc *resetb_gpio;
245 struct gpio_desc *pwdn_gpio;
246 unsigned int mbus_config; /* Media bus configuration flags */
247 int min_width; /* Filter out smaller sizes */
248 int min_height; /* Filter out smaller sizes */
249 int clock_speed; /* External clock speed (MHz) */
250 u8 clkrc; /* Clock divider value */
251 bool use_smbus; /* Use smbus I/O instead of I2C */
253 bool pclk_hb_disable;
254 const struct ov7670_devtype *devtype; /* Device specifics */
257 static inline struct ov7670_info *to_state(struct v4l2_subdev *sd)
259 return container_of(sd, struct ov7670_info, sd);
262 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
264 return &container_of(ctrl->handler, struct ov7670_info, hdl)->sd;
270 * The default register settings, as obtained from OmniVision. There
271 * is really no making sense of most of these - lots of "reserved" values
274 * These settings give VGA YUYV.
278 unsigned char reg_num;
282 static struct regval_list ov7670_default_regs[] = {
283 { REG_COM7, COM7_RESET },
285 * Clock scale: 3 = 15fps
289 { REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */
290 { REG_TSLB, 0x04 }, /* OV */
291 { REG_COM7, 0 }, /* VGA */
293 * Set the hardware window. These values from OV don't entirely
294 * make sense - hstop is less than hstart. But they work...
296 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
297 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
298 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },
300 { REG_COM3, 0 }, { REG_COM14, 0 },
301 /* Mystery scaling numbers */
302 { REG_SCALING_XSC, 0x3a },
303 { REG_SCALING_YSC, 0x35 },
304 { 0x72, 0x11 }, { 0x73, 0xf0 },
305 { 0xa2, 0x02 }, { REG_COM10, 0x0 },
307 /* Gamma curve values */
308 { 0x7a, 0x20 }, { 0x7b, 0x10 },
309 { 0x7c, 0x1e }, { 0x7d, 0x35 },
310 { 0x7e, 0x5a }, { 0x7f, 0x69 },
311 { 0x80, 0x76 }, { 0x81, 0x80 },
312 { 0x82, 0x88 }, { 0x83, 0x8f },
313 { 0x84, 0x96 }, { 0x85, 0xa3 },
314 { 0x86, 0xaf }, { 0x87, 0xc4 },
315 { 0x88, 0xd7 }, { 0x89, 0xe8 },
317 /* AGC and AEC parameters. Note we start by disabling those features,
318 then turn them only after tweaking the values. */
319 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
320 { REG_GAIN, 0 }, { REG_AECH, 0 },
321 { REG_COM4, 0x40 }, /* magic reserved bit */
322 { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
323 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
324 { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
325 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
326 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */
327 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
328 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
329 { REG_HAECC7, 0x94 },
330 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
332 /* Almost all of these are magic "reserved" values. */
333 { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
334 { 0x16, 0x02 }, { REG_MVFP, 0x07 },
335 { 0x21, 0x02 }, { 0x22, 0x91 },
336 { 0x29, 0x07 }, { 0x33, 0x0b },
337 { 0x35, 0x0b }, { 0x37, 0x1d },
338 { 0x38, 0x71 }, { 0x39, 0x2a },
339 { REG_COM12, 0x78 }, { 0x4d, 0x40 },
340 { 0x4e, 0x20 }, { REG_GFIX, 0 },
341 { 0x6b, 0x4a }, { 0x74, 0x10 },
342 { 0x8d, 0x4f }, { 0x8e, 0 },
343 { 0x8f, 0 }, { 0x90, 0 },
344 { 0x91, 0 }, { 0x96, 0 },
345 { 0x9a, 0 }, { 0xb0, 0x84 },
346 { 0xb1, 0x0c }, { 0xb2, 0x0e },
347 { 0xb3, 0x82 }, { 0xb8, 0x0a },
349 /* More reserved magic, some of which tweaks white balance */
350 { 0x43, 0x0a }, { 0x44, 0xf0 },
351 { 0x45, 0x34 }, { 0x46, 0x58 },
352 { 0x47, 0x28 }, { 0x48, 0x3a },
353 { 0x59, 0x88 }, { 0x5a, 0x88 },
354 { 0x5b, 0x44 }, { 0x5c, 0x67 },
355 { 0x5d, 0x49 }, { 0x5e, 0x0e },
356 { 0x6c, 0x0a }, { 0x6d, 0x55 },
357 { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */
358 { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
360 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
362 /* Matrix coefficients */
363 { 0x4f, 0x80 }, { 0x50, 0x80 },
364 { 0x51, 0 }, { 0x52, 0x22 },
365 { 0x53, 0x5e }, { 0x54, 0x80 },
368 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
369 { 0x75, 0x05 }, { 0x76, 0xe1 },
370 { 0x4c, 0 }, { 0x77, 0x01 },
371 { REG_COM13, 0xc3 }, { 0x4b, 0x09 },
372 { 0xc9, 0x60 }, { REG_COM16, 0x38 },
375 { 0x34, 0x11 }, { REG_COM11, COM11_EXP|COM11_HZAUTO },
376 { 0xa4, 0x88 }, { 0x96, 0 },
377 { 0x97, 0x30 }, { 0x98, 0x20 },
378 { 0x99, 0x30 }, { 0x9a, 0x84 },
379 { 0x9b, 0x29 }, { 0x9c, 0x03 },
380 { 0x9d, 0x4c }, { 0x9e, 0x3f },
383 /* Extra-weird stuff. Some sort of multiplexor register */
384 { 0x79, 0x01 }, { 0xc8, 0xf0 },
385 { 0x79, 0x0f }, { 0xc8, 0x00 },
386 { 0x79, 0x10 }, { 0xc8, 0x7e },
387 { 0x79, 0x0a }, { 0xc8, 0x80 },
388 { 0x79, 0x0b }, { 0xc8, 0x01 },
389 { 0x79, 0x0c }, { 0xc8, 0x0f },
390 { 0x79, 0x0d }, { 0xc8, 0x20 },
391 { 0x79, 0x09 }, { 0xc8, 0x80 },
392 { 0x79, 0x02 }, { 0xc8, 0xc0 },
393 { 0x79, 0x03 }, { 0xc8, 0x40 },
394 { 0x79, 0x05 }, { 0xc8, 0x30 },
397 { 0xff, 0xff }, /* END MARKER */
402 * Here we'll try to encapsulate the changes for just the output
405 * RGB656 and YUV422 come from OV; RGB444 is homebrewed.
407 * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why.
411 static struct regval_list ov7670_fmt_yuv422[] = {
412 { REG_COM7, 0x0 }, /* Selects YUV mode */
413 { REG_RGB444, 0 }, /* No RGB444 please */
414 { REG_COM1, 0 }, /* CCIR601 */
415 { REG_COM15, COM15_R00FF },
416 { REG_COM9, 0x48 }, /* 32x gain ceiling; 0x8 is reserved bit */
417 { 0x4f, 0x80 }, /* "matrix coefficient 1" */
418 { 0x50, 0x80 }, /* "matrix coefficient 2" */
419 { 0x51, 0 }, /* vb */
420 { 0x52, 0x22 }, /* "matrix coefficient 4" */
421 { 0x53, 0x5e }, /* "matrix coefficient 5" */
422 { 0x54, 0x80 }, /* "matrix coefficient 6" */
423 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
427 static struct regval_list ov7670_fmt_rgb565[] = {
428 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
429 { REG_RGB444, 0 }, /* No RGB444 please */
430 { REG_COM1, 0x0 }, /* CCIR601 */
431 { REG_COM15, COM15_RGB565 },
432 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
433 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
434 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
435 { 0x51, 0 }, /* vb */
436 { 0x52, 0x3d }, /* "matrix coefficient 4" */
437 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
438 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
439 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
443 static struct regval_list ov7670_fmt_rgb444[] = {
444 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
445 { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */
446 { REG_COM1, 0x0 }, /* CCIR601 */
447 { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */
448 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
449 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
450 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
451 { 0x51, 0 }, /* vb */
452 { 0x52, 0x3d }, /* "matrix coefficient 4" */
453 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
454 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
455 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */
459 static struct regval_list ov7670_fmt_raw[] = {
460 { REG_COM7, COM7_BAYER },
461 { REG_COM13, 0x08 }, /* No gamma, magic rsvd bit */
462 { REG_COM16, 0x3d }, /* Edge enhancement, denoise */
463 { REG_REG76, 0xe1 }, /* Pix correction, magic rsvd */
470 * Low-level register I/O.
472 * Note that there are two versions of these. On the XO 1, the
473 * i2c controller only does SMBUS, so that's what we use. The
474 * ov7670 is not really an SMBUS device, though, so the communication
475 * is not always entirely reliable.
477 static int ov7670_read_smbus(struct v4l2_subdev *sd, unsigned char reg,
478 unsigned char *value)
480 struct i2c_client *client = v4l2_get_subdevdata(sd);
483 ret = i2c_smbus_read_byte_data(client, reg);
485 *value = (unsigned char)ret;
492 static int ov7670_write_smbus(struct v4l2_subdev *sd, unsigned char reg,
495 struct i2c_client *client = v4l2_get_subdevdata(sd);
496 int ret = i2c_smbus_write_byte_data(client, reg, value);
498 if (reg == REG_COM7 && (value & COM7_RESET))
499 msleep(5); /* Wait for reset to run */
504 * On most platforms, we'd rather do straight i2c I/O.
506 static int ov7670_read_i2c(struct v4l2_subdev *sd, unsigned char reg,
507 unsigned char *value)
509 struct i2c_client *client = v4l2_get_subdevdata(sd);
515 * Send out the register address...
517 msg.addr = client->addr;
521 ret = i2c_transfer(client->adapter, &msg, 1);
523 printk(KERN_ERR "Error %d on register write\n", ret);
527 * ...then read back the result.
529 msg.flags = I2C_M_RD;
530 ret = i2c_transfer(client->adapter, &msg, 1);
539 static int ov7670_write_i2c(struct v4l2_subdev *sd, unsigned char reg,
542 struct i2c_client *client = v4l2_get_subdevdata(sd);
544 unsigned char data[2] = { reg, value };
547 msg.addr = client->addr;
551 ret = i2c_transfer(client->adapter, &msg, 1);
554 if (reg == REG_COM7 && (value & COM7_RESET))
555 msleep(5); /* Wait for reset to run */
559 static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
560 unsigned char *value)
562 struct ov7670_info *info = to_state(sd);
565 return ov7670_read_smbus(sd, reg, value);
567 return ov7670_read_i2c(sd, reg, value);
570 static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
573 struct ov7670_info *info = to_state(sd);
576 return ov7670_write_smbus(sd, reg, value);
578 return ov7670_write_i2c(sd, reg, value);
581 static int ov7670_update_bits(struct v4l2_subdev *sd, unsigned char reg,
582 unsigned char mask, unsigned char value)
587 ret = ov7670_read(sd, reg, &orig);
591 return ov7670_write(sd, reg, (orig & ~mask) | (value & mask));
595 * Write a list of register settings; ff/ff stops the process.
597 static int ov7670_write_array(struct v4l2_subdev *sd, struct regval_list *vals)
599 while (vals->reg_num != 0xff || vals->value != 0xff) {
600 int ret = ov7670_write(sd, vals->reg_num, vals->value);
611 * Stuff that knows about the sensor.
613 static int ov7670_reset(struct v4l2_subdev *sd, u32 val)
615 ov7670_write(sd, REG_COM7, COM7_RESET);
621 static int ov7670_init(struct v4l2_subdev *sd, u32 val)
623 return ov7670_write_array(sd, ov7670_default_regs);
626 static int ov7670_detect(struct v4l2_subdev *sd)
631 ret = ov7670_init(sd, 0);
634 ret = ov7670_read(sd, REG_MIDH, &v);
637 if (v != 0x7f) /* OV manuf. id. */
639 ret = ov7670_read(sd, REG_MIDL, &v);
645 * OK, we know we have an OmniVision chip...but which one?
647 ret = ov7670_read(sd, REG_PID, &v);
650 if (v != 0x76) /* PID + VER = 0x76 / 0x73 */
652 ret = ov7670_read(sd, REG_VER, &v);
655 if (v != 0x73) /* PID + VER = 0x76 / 0x73 */
662 * Store information about the video data format. The color matrix
663 * is deeply tied into the format, so keep the relevant values here.
664 * The magic matrix numbers come from OmniVision.
666 static struct ov7670_format_struct {
668 enum v4l2_colorspace colorspace;
669 struct regval_list *regs;
670 int cmatrix[CMATRIX_LEN];
671 } ov7670_formats[] = {
673 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
674 .colorspace = V4L2_COLORSPACE_SRGB,
675 .regs = ov7670_fmt_yuv422,
676 .cmatrix = { 128, -128, 0, -34, -94, 128 },
679 .mbus_code = MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE,
680 .colorspace = V4L2_COLORSPACE_SRGB,
681 .regs = ov7670_fmt_rgb444,
682 .cmatrix = { 179, -179, 0, -61, -176, 228 },
685 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
686 .colorspace = V4L2_COLORSPACE_SRGB,
687 .regs = ov7670_fmt_rgb565,
688 .cmatrix = { 179, -179, 0, -61, -176, 228 },
691 .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
692 .colorspace = V4L2_COLORSPACE_SRGB,
693 .regs = ov7670_fmt_raw,
694 .cmatrix = { 0, 0, 0, 0, 0, 0 },
697 #define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats)
701 * Then there is the issue of window sizes. Try to capture the info here.
705 * QCIF mode is done (by OV) in a very strange way - it actually looks like
706 * VGA with weird scaling options - they do *not* use the canned QCIF mode
707 * which is allegedly provided by the sensor. So here's the weird register
710 static struct regval_list ov7670_qcif_regs[] = {
711 { REG_COM3, COM3_SCALEEN|COM3_DCWEN },
712 { REG_COM3, COM3_DCWEN },
713 { REG_COM14, COM14_DCWEN | 0x01},
729 static struct ov7670_win_size ov7670_win_sizes[] = {
733 .height = VGA_HEIGHT,
734 .com7_bit = COM7_FMT_VGA,
735 .hstart = 158, /* These values from */
736 .hstop = 14, /* Omnivision */
744 .height = CIF_HEIGHT,
745 .com7_bit = COM7_FMT_CIF,
746 .hstart = 170, /* Empirically determined */
755 .height = QVGA_HEIGHT,
756 .com7_bit = COM7_FMT_QVGA,
757 .hstart = 168, /* Empirically determined */
766 .height = QCIF_HEIGHT,
767 .com7_bit = COM7_FMT_VGA, /* see comment above */
768 .hstart = 456, /* Empirically determined */
772 .regs = ov7670_qcif_regs,
776 static struct ov7670_win_size ov7675_win_sizes[] = {
778 * Currently, only VGA is supported. Theoretically it could be possible
779 * to support CIF, QVGA and QCIF too. Taking values for ov7670 as a
780 * base and tweak them empirically could be required.
784 .height = VGA_HEIGHT,
785 .com7_bit = COM7_FMT_VGA,
786 .hstart = 158, /* These values from */
787 .hstop = 14, /* Omnivision */
788 .vstart = 14, /* Empirically determined */
794 static void ov7675_get_framerate(struct v4l2_subdev *sd,
795 struct v4l2_fract *tpf)
797 struct ov7670_info *info = to_state(sd);
798 u32 clkrc = info->clkrc;
801 if (info->pll_bypass)
804 pll_factor = PLL_FACTOR;
807 if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
808 clkrc = (clkrc >> 1);
811 tpf->denominator = (5 * pll_factor * info->clock_speed) /
815 static int ov7675_apply_framerate(struct v4l2_subdev *sd)
817 struct ov7670_info *info = to_state(sd);
820 ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
824 return ov7670_write(sd, REG_DBLV,
825 info->pll_bypass ? DBLV_BYPASS : DBLV_X4);
828 static int ov7675_set_framerate(struct v4l2_subdev *sd,
829 struct v4l2_fract *tpf)
831 struct ov7670_info *info = to_state(sd);
836 * The formula is fps = 5/4*pixclk for YUV/RGB and
837 * fps = 5/2*pixclk for RAW.
839 * pixclk = clock_speed / (clkrc + 1) * PLLfactor
842 if (tpf->numerator == 0 || tpf->denominator == 0) {
845 pll_factor = info->pll_bypass ? 1 : PLL_FACTOR;
846 clkrc = (5 * pll_factor * info->clock_speed * tpf->numerator) /
847 (4 * tpf->denominator);
848 if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
849 clkrc = (clkrc << 1);
854 * The datasheet claims that clkrc = 0 will divide the input clock by 1
855 * but we've checked with an oscilloscope that it divides by 2 instead.
856 * So, if clkrc = 0 just bypass the divider.
860 else if (clkrc > CLK_SCALE)
864 /* Recalculate frame rate */
865 ov7675_get_framerate(sd, tpf);
868 * If the device is not powered up by the host driver do
869 * not apply any changes to H/W at this time. Instead
870 * the framerate will be restored right after power-up.
873 return ov7675_apply_framerate(sd);
878 static void ov7670_get_framerate_legacy(struct v4l2_subdev *sd,
879 struct v4l2_fract *tpf)
881 struct ov7670_info *info = to_state(sd);
884 tpf->denominator = info->clock_speed;
885 if ((info->clkrc & CLK_EXT) == 0 && (info->clkrc & CLK_SCALE) > 1)
886 tpf->denominator /= (info->clkrc & CLK_SCALE);
889 static int ov7670_set_framerate_legacy(struct v4l2_subdev *sd,
890 struct v4l2_fract *tpf)
892 struct ov7670_info *info = to_state(sd);
895 if (tpf->numerator == 0 || tpf->denominator == 0)
896 div = 1; /* Reset to full rate */
898 div = (tpf->numerator * info->clock_speed) / tpf->denominator;
901 else if (div > CLK_SCALE)
903 info->clkrc = (info->clkrc & 0x80) | div;
905 tpf->denominator = info->clock_speed / div;
908 * If the device is not powered up by the host driver do
909 * not apply any changes to H/W at this time. Instead
910 * the framerate will be restored right after power-up.
913 return ov7670_write(sd, REG_CLKRC, info->clkrc);
919 * Store a set of start/stop values into the camera.
921 static int ov7670_set_hw(struct v4l2_subdev *sd, int hstart, int hstop,
922 int vstart, int vstop)
927 * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of
928 * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is
929 * a mystery "edge offset" value in the top two bits of href.
931 ret = ov7670_write(sd, REG_HSTART, (hstart >> 3) & 0xff);
934 ret = ov7670_write(sd, REG_HSTOP, (hstop >> 3) & 0xff);
937 ret = ov7670_read(sd, REG_HREF, &v);
940 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
942 ret = ov7670_write(sd, REG_HREF, v);
945 /* Vertical: similar arrangement, but only 10 bits. */
946 ret = ov7670_write(sd, REG_VSTART, (vstart >> 2) & 0xff);
949 ret = ov7670_write(sd, REG_VSTOP, (vstop >> 2) & 0xff);
952 ret = ov7670_read(sd, REG_VREF, &v);
955 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
957 return ov7670_write(sd, REG_VREF, v);
961 static int ov7670_enum_mbus_code(struct v4l2_subdev *sd,
962 struct v4l2_subdev_state *sd_state,
963 struct v4l2_subdev_mbus_code_enum *code)
965 if (code->pad || code->index >= N_OV7670_FMTS)
968 code->code = ov7670_formats[code->index].mbus_code;
972 static int ov7670_try_fmt_internal(struct v4l2_subdev *sd,
973 struct v4l2_mbus_framefmt *fmt,
974 struct ov7670_format_struct **ret_fmt,
975 struct ov7670_win_size **ret_wsize)
978 struct ov7670_win_size *wsize;
979 struct ov7670_info *info = to_state(sd);
980 unsigned int n_win_sizes = info->devtype->n_win_sizes;
981 unsigned int win_sizes_limit = n_win_sizes;
983 for (index = 0; index < N_OV7670_FMTS; index++)
984 if (ov7670_formats[index].mbus_code == fmt->code)
986 if (index >= N_OV7670_FMTS) {
987 /* default to first format */
989 fmt->code = ov7670_formats[0].mbus_code;
992 *ret_fmt = ov7670_formats + index;
994 * Fields: the OV devices claim to be progressive.
996 fmt->field = V4L2_FIELD_NONE;
999 * Don't consider values that don't match min_height and min_width
1002 if (info->min_width || info->min_height)
1003 for (i = 0; i < n_win_sizes; i++) {
1004 wsize = info->devtype->win_sizes + i;
1006 if (wsize->width < info->min_width ||
1007 wsize->height < info->min_height) {
1008 win_sizes_limit = i;
1013 * Round requested image size down to the nearest
1014 * we support, but not below the smallest.
1016 for (wsize = info->devtype->win_sizes;
1017 wsize < info->devtype->win_sizes + win_sizes_limit; wsize++)
1018 if (fmt->width >= wsize->width && fmt->height >= wsize->height)
1020 if (wsize >= info->devtype->win_sizes + win_sizes_limit)
1021 wsize--; /* Take the smallest one */
1022 if (ret_wsize != NULL)
1025 * Note the size we'll actually handle.
1027 fmt->width = wsize->width;
1028 fmt->height = wsize->height;
1029 fmt->colorspace = ov7670_formats[index].colorspace;
1031 info->format = *fmt;
1036 static int ov7670_apply_fmt(struct v4l2_subdev *sd)
1038 struct ov7670_info *info = to_state(sd);
1039 struct ov7670_win_size *wsize = info->wsize;
1040 unsigned char com7, com10 = 0;
1044 * COM7 is a pain in the ass, it doesn't like to be read then
1045 * quickly written afterward. But we have everything we need
1046 * to set it absolutely here, as long as the format-specific
1047 * register sets list it first.
1049 com7 = info->fmt->regs[0].value;
1050 com7 |= wsize->com7_bit;
1051 ret = ov7670_write(sd, REG_COM7, com7);
1056 * Configure the media bus through COM10 register
1058 if (info->mbus_config & V4L2_MBUS_VSYNC_ACTIVE_LOW)
1059 com10 |= COM10_VS_NEG;
1060 if (info->mbus_config & V4L2_MBUS_HSYNC_ACTIVE_LOW)
1061 com10 |= COM10_HREF_REV;
1062 if (info->pclk_hb_disable)
1063 com10 |= COM10_PCLK_HB;
1064 ret = ov7670_write(sd, REG_COM10, com10);
1069 * Now write the rest of the array. Also store start/stops
1071 ret = ov7670_write_array(sd, info->fmt->regs + 1);
1075 ret = ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
1081 ret = ov7670_write_array(sd, wsize->regs);
1087 * If we're running RGB565, we must rewrite clkrc after setting
1088 * the other parameters or the image looks poor. If we're *not*
1089 * doing RGB565, we must not rewrite clkrc or the image looks
1092 * (Update) Now that we retain clkrc state, we should be able
1093 * to write it unconditionally, and that will make the frame
1094 * rate persistent too.
1096 ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
1106 static int ov7670_set_fmt(struct v4l2_subdev *sd,
1107 struct v4l2_subdev_state *sd_state,
1108 struct v4l2_subdev_format *format)
1110 struct ov7670_info *info = to_state(sd);
1111 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1112 struct v4l2_mbus_framefmt *mbus_fmt;
1119 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
1120 ret = ov7670_try_fmt_internal(sd, &format->format, NULL, NULL);
1123 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1124 mbus_fmt = v4l2_subdev_get_try_format(sd, sd_state,
1126 *mbus_fmt = format->format;
1131 ret = ov7670_try_fmt_internal(sd, &format->format, &info->fmt, &info->wsize);
1136 * If the device is not powered up by the host driver do
1137 * not apply any changes to H/W at this time. Instead
1138 * the frame format will be restored right after power-up.
1141 return ov7670_apply_fmt(sd);
1146 static int ov7670_get_fmt(struct v4l2_subdev *sd,
1147 struct v4l2_subdev_state *sd_state,
1148 struct v4l2_subdev_format *format)
1150 struct ov7670_info *info = to_state(sd);
1151 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1152 struct v4l2_mbus_framefmt *mbus_fmt;
1155 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
1156 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1157 mbus_fmt = v4l2_subdev_get_try_format(sd, sd_state, 0);
1158 format->format = *mbus_fmt;
1164 format->format = info->format;
1171 * Implement G/S_PARM. There is a "high quality" mode we could try
1172 * to do someday; for now, we just do the frame rate tweak.
1174 static int ov7670_g_frame_interval(struct v4l2_subdev *sd,
1175 struct v4l2_subdev_frame_interval *ival)
1177 struct ov7670_info *info = to_state(sd);
1180 info->devtype->get_framerate(sd, &ival->interval);
1185 static int ov7670_s_frame_interval(struct v4l2_subdev *sd,
1186 struct v4l2_subdev_frame_interval *ival)
1188 struct v4l2_fract *tpf = &ival->interval;
1189 struct ov7670_info *info = to_state(sd);
1192 return info->devtype->set_framerate(sd, tpf);
1197 * Frame intervals. Since frame rates are controlled with the clock
1198 * divider, we can only do 30/n for integer n values. So no continuous
1199 * or stepwise options. Here we just pick a handful of logical values.
1202 static int ov7670_frame_rates[] = { 30, 15, 10, 5, 1 };
1204 static int ov7670_enum_frame_interval(struct v4l2_subdev *sd,
1205 struct v4l2_subdev_state *sd_state,
1206 struct v4l2_subdev_frame_interval_enum *fie)
1208 struct ov7670_info *info = to_state(sd);
1209 unsigned int n_win_sizes = info->devtype->n_win_sizes;
1214 if (fie->index >= ARRAY_SIZE(ov7670_frame_rates))
1218 * Check if the width/height is valid.
1220 * If a minimum width/height was requested, filter out the capture
1221 * windows that fall outside that.
1223 for (i = 0; i < n_win_sizes; i++) {
1224 struct ov7670_win_size *win = &info->devtype->win_sizes[i];
1226 if (info->min_width && win->width < info->min_width)
1228 if (info->min_height && win->height < info->min_height)
1230 if (fie->width == win->width && fie->height == win->height)
1233 if (i == n_win_sizes)
1235 fie->interval.numerator = 1;
1236 fie->interval.denominator = ov7670_frame_rates[fie->index];
1241 * Frame size enumeration
1243 static int ov7670_enum_frame_size(struct v4l2_subdev *sd,
1244 struct v4l2_subdev_state *sd_state,
1245 struct v4l2_subdev_frame_size_enum *fse)
1247 struct ov7670_info *info = to_state(sd);
1250 __u32 index = fse->index;
1251 unsigned int n_win_sizes = info->devtype->n_win_sizes;
1257 * If a minimum width/height was requested, filter out the capture
1258 * windows that fall outside that.
1260 for (i = 0; i < n_win_sizes; i++) {
1261 struct ov7670_win_size *win = &info->devtype->win_sizes[i];
1263 if (info->min_width && win->width < info->min_width)
1265 if (info->min_height && win->height < info->min_height)
1267 if (index == ++num_valid) {
1268 fse->min_width = fse->max_width = win->width;
1269 fse->min_height = fse->max_height = win->height;
1278 * Code for dealing with controls.
1281 static int ov7670_store_cmatrix(struct v4l2_subdev *sd,
1282 int matrix[CMATRIX_LEN])
1285 unsigned char signbits = 0;
1288 * Weird crap seems to exist in the upper part of
1289 * the sign bits register, so let's preserve it.
1291 ret = ov7670_read(sd, REG_CMATRIX_SIGN, &signbits);
1294 for (i = 0; i < CMATRIX_LEN; i++) {
1297 if (matrix[i] < 0) {
1298 signbits |= (1 << i);
1299 if (matrix[i] < -255)
1302 raw = (-1 * matrix[i]) & 0xff;
1304 if (matrix[i] > 255)
1307 raw = matrix[i] & 0xff;
1309 ret = ov7670_write(sd, REG_CMATRIX_BASE + i, raw);
1313 return ov7670_write(sd, REG_CMATRIX_SIGN, signbits);
1318 * Hue also requires messing with the color matrix. It also requires
1319 * trig functions, which tend not to be well supported in the kernel.
1320 * So here is a simple table of sine values, 0-90 degrees, in steps
1321 * of five degrees. Values are multiplied by 1000.
1323 * The following naive approximate trig functions require an argument
1324 * carefully limited to -180 <= theta <= 180.
1327 static const int ov7670_sin_table[] = {
1328 0, 87, 173, 258, 342, 422,
1329 499, 573, 642, 707, 766, 819,
1330 866, 906, 939, 965, 984, 996,
1334 static int ov7670_sine(int theta)
1344 sine = ov7670_sin_table[theta/SIN_STEP];
1347 sine = 1000 - ov7670_sin_table[theta/SIN_STEP];
1352 static int ov7670_cosine(int theta)
1357 else if (theta < -180)
1359 return ov7670_sine(theta);
1365 static void ov7670_calc_cmatrix(struct ov7670_info *info,
1366 int matrix[CMATRIX_LEN], int sat, int hue)
1370 * Apply the current saturation setting first.
1372 for (i = 0; i < CMATRIX_LEN; i++)
1373 matrix[i] = (info->fmt->cmatrix[i] * sat) >> 7;
1375 * Then, if need be, rotate the hue value.
1378 int sinth, costh, tmpmatrix[CMATRIX_LEN];
1380 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
1381 sinth = ov7670_sine(hue);
1382 costh = ov7670_cosine(hue);
1384 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000;
1385 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000;
1386 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000;
1387 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000;
1388 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000;
1389 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000;
1395 static int ov7670_s_sat_hue(struct v4l2_subdev *sd, int sat, int hue)
1397 struct ov7670_info *info = to_state(sd);
1398 int matrix[CMATRIX_LEN];
1400 ov7670_calc_cmatrix(info, matrix, sat, hue);
1401 return ov7670_store_cmatrix(sd, matrix);
1406 * Some weird registers seem to store values in a sign/magnitude format!
1409 static unsigned char ov7670_abs_to_sm(unsigned char v)
1413 return (128 - v) | 0x80;
1416 static int ov7670_s_brightness(struct v4l2_subdev *sd, int value)
1418 unsigned char com8 = 0, v;
1420 ov7670_read(sd, REG_COM8, &com8);
1422 ov7670_write(sd, REG_COM8, com8);
1423 v = ov7670_abs_to_sm(value);
1424 return ov7670_write(sd, REG_BRIGHT, v);
1427 static int ov7670_s_contrast(struct v4l2_subdev *sd, int value)
1429 return ov7670_write(sd, REG_CONTRAS, (unsigned char) value);
1432 static int ov7670_s_hflip(struct v4l2_subdev *sd, int value)
1434 unsigned char v = 0;
1437 ret = ov7670_read(sd, REG_MVFP, &v);
1444 msleep(10); /* FIXME */
1445 return ov7670_write(sd, REG_MVFP, v);
1448 static int ov7670_s_vflip(struct v4l2_subdev *sd, int value)
1450 unsigned char v = 0;
1453 ret = ov7670_read(sd, REG_MVFP, &v);
1460 msleep(10); /* FIXME */
1461 return ov7670_write(sd, REG_MVFP, v);
1465 * GAIN is split between REG_GAIN and REG_VREF[7:6]. If one believes
1466 * the data sheet, the VREF parts should be the most significant, but
1467 * experience shows otherwise. There seems to be little value in
1468 * messing with the VREF bits, so we leave them alone.
1470 static int ov7670_g_gain(struct v4l2_subdev *sd, __s32 *value)
1475 ret = ov7670_read(sd, REG_GAIN, &gain);
1482 static int ov7670_s_gain(struct v4l2_subdev *sd, int value)
1487 ret = ov7670_write(sd, REG_GAIN, value & 0xff);
1490 /* Have to turn off AGC as well */
1491 ret = ov7670_read(sd, REG_COM8, &com8);
1494 return ov7670_write(sd, REG_COM8, com8 & ~COM8_AGC);
1500 static int ov7670_s_autogain(struct v4l2_subdev *sd, int value)
1505 ret = ov7670_read(sd, REG_COM8, &com8);
1511 ret = ov7670_write(sd, REG_COM8, com8);
1516 static int ov7670_s_exp(struct v4l2_subdev *sd, int value)
1519 unsigned char com1, com8, aech, aechh;
1521 ret = ov7670_read(sd, REG_COM1, &com1) +
1522 ov7670_read(sd, REG_COM8, &com8) +
1523 ov7670_read(sd, REG_AECHH, &aechh);
1527 com1 = (com1 & 0xfc) | (value & 0x03);
1528 aech = (value >> 2) & 0xff;
1529 aechh = (aechh & 0xc0) | ((value >> 10) & 0x3f);
1530 ret = ov7670_write(sd, REG_COM1, com1) +
1531 ov7670_write(sd, REG_AECH, aech) +
1532 ov7670_write(sd, REG_AECHH, aechh);
1533 /* Have to turn off AEC as well */
1535 ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AEC);
1540 * Tweak autoexposure.
1542 static int ov7670_s_autoexp(struct v4l2_subdev *sd,
1543 enum v4l2_exposure_auto_type value)
1548 ret = ov7670_read(sd, REG_COM8, &com8);
1550 if (value == V4L2_EXPOSURE_AUTO)
1554 ret = ov7670_write(sd, REG_COM8, com8);
1559 static const char * const ov7670_test_pattern_menu[] = {
1563 "Fade to gray color bar",
1566 static int ov7670_s_test_pattern(struct v4l2_subdev *sd, int value)
1570 ret = ov7670_update_bits(sd, REG_SCALING_XSC, TEST_PATTTERN_0,
1571 value & BIT(0) ? TEST_PATTTERN_0 : 0);
1575 return ov7670_update_bits(sd, REG_SCALING_YSC, TEST_PATTTERN_1,
1576 value & BIT(1) ? TEST_PATTTERN_1 : 0);
1579 static int ov7670_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
1581 struct v4l2_subdev *sd = to_sd(ctrl);
1582 struct ov7670_info *info = to_state(sd);
1585 case V4L2_CID_AUTOGAIN:
1586 return ov7670_g_gain(sd, &info->gain->val);
1591 static int ov7670_s_ctrl(struct v4l2_ctrl *ctrl)
1593 struct v4l2_subdev *sd = to_sd(ctrl);
1594 struct ov7670_info *info = to_state(sd);
1597 case V4L2_CID_BRIGHTNESS:
1598 return ov7670_s_brightness(sd, ctrl->val);
1599 case V4L2_CID_CONTRAST:
1600 return ov7670_s_contrast(sd, ctrl->val);
1601 case V4L2_CID_SATURATION:
1602 return ov7670_s_sat_hue(sd,
1603 info->saturation->val, info->hue->val);
1604 case V4L2_CID_VFLIP:
1605 return ov7670_s_vflip(sd, ctrl->val);
1606 case V4L2_CID_HFLIP:
1607 return ov7670_s_hflip(sd, ctrl->val);
1608 case V4L2_CID_AUTOGAIN:
1609 /* Only set manual gain if auto gain is not explicitly
1612 /* ov7670_s_gain turns off auto gain */
1613 return ov7670_s_gain(sd, info->gain->val);
1615 return ov7670_s_autogain(sd, ctrl->val);
1616 case V4L2_CID_EXPOSURE_AUTO:
1617 /* Only set manual exposure if auto exposure is not explicitly
1619 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
1620 /* ov7670_s_exp turns off auto exposure */
1621 return ov7670_s_exp(sd, info->exposure->val);
1623 return ov7670_s_autoexp(sd, ctrl->val);
1624 case V4L2_CID_TEST_PATTERN:
1625 return ov7670_s_test_pattern(sd, ctrl->val);
1630 static const struct v4l2_ctrl_ops ov7670_ctrl_ops = {
1631 .s_ctrl = ov7670_s_ctrl,
1632 .g_volatile_ctrl = ov7670_g_volatile_ctrl,
1635 #ifdef CONFIG_VIDEO_ADV_DEBUG
1636 static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
1638 unsigned char val = 0;
1641 ret = ov7670_read(sd, reg->reg & 0xff, &val);
1647 static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
1649 ov7670_write(sd, reg->reg & 0xff, reg->val & 0xff);
1654 static void ov7670_power_on(struct v4l2_subdev *sd)
1656 struct ov7670_info *info = to_state(sd);
1661 clk_prepare_enable(info->clk);
1663 if (info->pwdn_gpio)
1664 gpiod_set_value(info->pwdn_gpio, 0);
1665 if (info->resetb_gpio) {
1666 gpiod_set_value(info->resetb_gpio, 1);
1667 usleep_range(500, 1000);
1668 gpiod_set_value(info->resetb_gpio, 0);
1670 if (info->pwdn_gpio || info->resetb_gpio || info->clk)
1671 usleep_range(3000, 5000);
1676 static void ov7670_power_off(struct v4l2_subdev *sd)
1678 struct ov7670_info *info = to_state(sd);
1683 clk_disable_unprepare(info->clk);
1685 if (info->pwdn_gpio)
1686 gpiod_set_value(info->pwdn_gpio, 1);
1691 static int ov7670_s_power(struct v4l2_subdev *sd, int on)
1693 struct ov7670_info *info = to_state(sd);
1699 ov7670_power_on(sd);
1701 ov7670_apply_fmt(sd);
1702 ov7675_apply_framerate(sd);
1703 v4l2_ctrl_handler_setup(&info->hdl);
1705 ov7670_power_off(sd);
1711 static void ov7670_get_default_format(struct v4l2_subdev *sd,
1712 struct v4l2_mbus_framefmt *format)
1714 struct ov7670_info *info = to_state(sd);
1716 format->width = info->devtype->win_sizes[0].width;
1717 format->height = info->devtype->win_sizes[0].height;
1718 format->colorspace = info->fmt->colorspace;
1719 format->code = info->fmt->mbus_code;
1720 format->field = V4L2_FIELD_NONE;
1723 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1724 static int ov7670_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
1726 struct v4l2_mbus_framefmt *format =
1727 v4l2_subdev_get_try_format(sd, fh->state, 0);
1729 ov7670_get_default_format(sd, format);
1735 /* ----------------------------------------------------------------------- */
1737 static const struct v4l2_subdev_core_ops ov7670_core_ops = {
1738 .reset = ov7670_reset,
1739 .init = ov7670_init,
1740 .s_power = ov7670_s_power,
1741 .log_status = v4l2_ctrl_subdev_log_status,
1742 .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
1743 .unsubscribe_event = v4l2_event_subdev_unsubscribe,
1744 #ifdef CONFIG_VIDEO_ADV_DEBUG
1745 .g_register = ov7670_g_register,
1746 .s_register = ov7670_s_register,
1750 static const struct v4l2_subdev_video_ops ov7670_video_ops = {
1751 .s_frame_interval = ov7670_s_frame_interval,
1752 .g_frame_interval = ov7670_g_frame_interval,
1755 static const struct v4l2_subdev_pad_ops ov7670_pad_ops = {
1756 .enum_frame_interval = ov7670_enum_frame_interval,
1757 .enum_frame_size = ov7670_enum_frame_size,
1758 .enum_mbus_code = ov7670_enum_mbus_code,
1759 .get_fmt = ov7670_get_fmt,
1760 .set_fmt = ov7670_set_fmt,
1763 static const struct v4l2_subdev_ops ov7670_ops = {
1764 .core = &ov7670_core_ops,
1765 .video = &ov7670_video_ops,
1766 .pad = &ov7670_pad_ops,
1769 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1770 static const struct v4l2_subdev_internal_ops ov7670_subdev_internal_ops = {
1771 .open = ov7670_open,
1775 /* ----------------------------------------------------------------------- */
1777 static const struct ov7670_devtype ov7670_devdata[] = {
1779 .win_sizes = ov7670_win_sizes,
1780 .n_win_sizes = ARRAY_SIZE(ov7670_win_sizes),
1781 .set_framerate = ov7670_set_framerate_legacy,
1782 .get_framerate = ov7670_get_framerate_legacy,
1785 .win_sizes = ov7675_win_sizes,
1786 .n_win_sizes = ARRAY_SIZE(ov7675_win_sizes),
1787 .set_framerate = ov7675_set_framerate,
1788 .get_framerate = ov7675_get_framerate,
1792 static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info)
1794 info->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
1796 if (IS_ERR(info->pwdn_gpio)) {
1797 dev_info(&client->dev, "can't get %s GPIO\n", "powerdown");
1798 return PTR_ERR(info->pwdn_gpio);
1801 info->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1803 if (IS_ERR(info->resetb_gpio)) {
1804 dev_info(&client->dev, "can't get %s GPIO\n", "reset");
1805 return PTR_ERR(info->resetb_gpio);
1808 usleep_range(3000, 5000);
1814 * ov7670_parse_dt() - Parse device tree to collect mbus configuration
1817 static int ov7670_parse_dt(struct device *dev,
1818 struct ov7670_info *info)
1820 struct fwnode_handle *fwnode = dev_fwnode(dev);
1821 struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
1822 struct fwnode_handle *ep;
1828 info->pclk_hb_disable = false;
1829 if (fwnode_property_present(fwnode, "ov7670,pclk-hb-disable"))
1830 info->pclk_hb_disable = true;
1832 ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
1836 ret = v4l2_fwnode_endpoint_parse(ep, &bus_cfg);
1837 fwnode_handle_put(ep);
1841 if (bus_cfg.bus_type != V4L2_MBUS_PARALLEL) {
1842 dev_err(dev, "Unsupported media bus type\n");
1845 info->mbus_config = bus_cfg.bus.parallel.flags;
1850 static int ov7670_probe(struct i2c_client *client)
1852 const struct i2c_device_id *id = i2c_client_get_device_id(client);
1853 struct v4l2_fract tpf;
1854 struct v4l2_subdev *sd;
1855 struct ov7670_info *info;
1858 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
1862 v4l2_i2c_subdev_init(sd, client, &ov7670_ops);
1864 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
1865 sd->internal_ops = &ov7670_subdev_internal_ops;
1866 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
1869 info->clock_speed = 30; /* default: a guess */
1871 if (dev_fwnode(&client->dev)) {
1872 ret = ov7670_parse_dt(&client->dev, info);
1876 } else if (client->dev.platform_data) {
1877 struct ov7670_config *config = client->dev.platform_data;
1880 * Must apply configuration before initializing device, because it
1881 * selects I/O method.
1883 info->min_width = config->min_width;
1884 info->min_height = config->min_height;
1885 info->use_smbus = config->use_smbus;
1887 if (config->clock_speed)
1888 info->clock_speed = config->clock_speed;
1890 if (config->pll_bypass)
1891 info->pll_bypass = true;
1893 if (config->pclk_hb_disable)
1894 info->pclk_hb_disable = true;
1897 info->clk = devm_clk_get(&client->dev, "xclk"); /* optional */
1898 if (IS_ERR(info->clk)) {
1899 ret = PTR_ERR(info->clk);
1906 ret = ov7670_init_gpio(client, info);
1910 ov7670_power_on(sd);
1913 info->clock_speed = clk_get_rate(info->clk) / 1000000;
1914 if (info->clock_speed < 10 || info->clock_speed > 48) {
1920 /* Make sure it's an ov7670 */
1921 ret = ov7670_detect(sd);
1923 v4l_dbg(1, debug, client,
1924 "chip found @ 0x%x (%s) is not an ov7670 chip.\n",
1925 client->addr << 1, client->adapter->name);
1928 v4l_info(client, "chip found @ 0x%02x (%s)\n",
1929 client->addr << 1, client->adapter->name);
1931 info->devtype = &ov7670_devdata[id->driver_data];
1932 info->fmt = &ov7670_formats[0];
1933 info->wsize = &info->devtype->win_sizes[0];
1935 ov7670_get_default_format(sd, &info->format);
1939 /* Set default frame rate to 30 fps */
1941 tpf.denominator = 30;
1942 info->devtype->set_framerate(sd, &tpf);
1944 v4l2_ctrl_handler_init(&info->hdl, 10);
1945 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1946 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
1947 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1948 V4L2_CID_CONTRAST, 0, 127, 1, 64);
1949 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1950 V4L2_CID_VFLIP, 0, 1, 1, 0);
1951 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1952 V4L2_CID_HFLIP, 0, 1, 1, 0);
1953 info->saturation = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1954 V4L2_CID_SATURATION, 0, 256, 1, 128);
1955 info->hue = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1956 V4L2_CID_HUE, -180, 180, 5, 0);
1957 info->gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1958 V4L2_CID_GAIN, 0, 255, 1, 128);
1959 info->auto_gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1960 V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
1961 info->exposure = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
1962 V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
1963 info->auto_exposure = v4l2_ctrl_new_std_menu(&info->hdl, &ov7670_ctrl_ops,
1964 V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL, 0,
1965 V4L2_EXPOSURE_AUTO);
1966 v4l2_ctrl_new_std_menu_items(&info->hdl, &ov7670_ctrl_ops,
1967 V4L2_CID_TEST_PATTERN,
1968 ARRAY_SIZE(ov7670_test_pattern_menu) - 1, 0, 0,
1969 ov7670_test_pattern_menu);
1970 sd->ctrl_handler = &info->hdl;
1971 if (info->hdl.error) {
1972 ret = info->hdl.error;
1977 * We have checked empirically that hw allows to read back the gain
1978 * value chosen by auto gain but that's not the case for auto exposure.
1980 v4l2_ctrl_auto_cluster(2, &info->auto_gain, 0, true);
1981 v4l2_ctrl_auto_cluster(2, &info->auto_exposure,
1982 V4L2_EXPOSURE_MANUAL, false);
1983 v4l2_ctrl_cluster(2, &info->saturation);
1985 #if defined(CONFIG_MEDIA_CONTROLLER)
1986 info->pad.flags = MEDIA_PAD_FL_SOURCE;
1987 info->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
1988 ret = media_entity_pads_init(&info->sd.entity, 1, &info->pad);
1993 v4l2_ctrl_handler_setup(&info->hdl);
1995 ret = v4l2_async_register_subdev(&info->sd);
1997 goto entity_cleanup;
1999 ov7670_power_off(sd);
2003 media_entity_cleanup(&info->sd.entity);
2005 v4l2_ctrl_handler_free(&info->hdl);
2007 ov7670_power_off(sd);
2011 static void ov7670_remove(struct i2c_client *client)
2013 struct v4l2_subdev *sd = i2c_get_clientdata(client);
2014 struct ov7670_info *info = to_state(sd);
2016 v4l2_async_unregister_subdev(sd);
2017 v4l2_ctrl_handler_free(&info->hdl);
2018 media_entity_cleanup(&info->sd.entity);
2021 static const struct i2c_device_id ov7670_id[] = {
2022 { "ov7670", MODEL_OV7670 },
2023 { "ov7675", MODEL_OV7675 },
2026 MODULE_DEVICE_TABLE(i2c, ov7670_id);
2028 #if IS_ENABLED(CONFIG_OF)
2029 static const struct of_device_id ov7670_of_match[] = {
2030 { .compatible = "ovti,ov7670", },
2033 MODULE_DEVICE_TABLE(of, ov7670_of_match);
2036 static struct i2c_driver ov7670_driver = {
2039 .of_match_table = of_match_ptr(ov7670_of_match),
2041 .probe_new = ov7670_probe,
2042 .remove = ov7670_remove,
2043 .id_table = ov7670_id,
2046 module_i2c_driver(ov7670_driver);