1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * A V4L2 driver for OmniVision OV7670 cameras. 4 * 5 * Copyright 2006 One Laptop Per Child Association, Inc. Written 6 * by Jonathan Corbet with substantial inspiration from Mark 7 * McClelland's ovcamchip code. 8 * 9 * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net> 10 */ 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> 26 27 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); 28 MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors"); 29 MODULE_LICENSE("GPL"); 30 31 static bool debug; 32 module_param(debug, bool, 0644); 33 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 34 35 /* 36 * The 7670 sits on i2c with ID 0x42 37 */ 38 #define OV7670_I2C_ADDR 0x42 39 40 #define PLL_FACTOR 4 41 42 /* Registers */ 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 */ 104 105 #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 */ 139 140 /* 141 * This matrix defines how the colors are generated, must be 142 * tweaked to adjust hue and saturation. 143 * 144 * Order: v-red, v-green, v-blue, u-red, u-green, u-blue 145 * 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. 148 */ 149 #define REG_CMATRIX_BASE 0x4f 150 #define CMATRIX_LEN 6 151 #define REG_CMATRIX_SIGN 0x58 152 153 154 #define REG_BRIGHT 0x55 /* Brightness */ 155 #define REG_CONTRAS 0x56 /* Contrast control */ 156 157 #define REG_GFIX 0x69 /* Fix gain control */ 158 159 #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 */ 164 165 #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 169 170 #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 */ 173 174 #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 */ 177 178 #define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */ 179 #define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */ 180 181 #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 */ 188 189 struct ov7670_win_size { 190 int width; 191 int height; 192 unsigned char com7_bit; 193 int hstart; /* Start/stop values for the camera. Note */ 194 int hstop; /* that they do not always make complete */ 195 int vstart; /* sense to humans, but evidently the sensor */ 196 int vstop; /* will do the right thing... */ 197 struct regval_list *regs; /* Regs to tweak */ 198 }; 199 200 struct ov7670_devtype { 201 /* formats supported for each model */ 202 struct ov7670_win_size *win_sizes; 203 unsigned int n_win_sizes; 204 /* callbacks for frame rate control */ 205 int (*set_framerate)(struct v4l2_subdev *, struct v4l2_fract *); 206 void (*get_framerate)(struct v4l2_subdev *, struct v4l2_fract *); 207 }; 208 209 /* 210 * Information we maintain about a known sensor. 211 */ 212 struct ov7670_format_struct; /* coming later */ 213 struct ov7670_info { 214 struct v4l2_subdev sd; 215 struct media_pad pad; 216 struct v4l2_ctrl_handler hdl; 217 struct { 218 /* gain cluster */ 219 struct v4l2_ctrl *auto_gain; 220 struct v4l2_ctrl *gain; 221 }; 222 struct { 223 /* exposure cluster */ 224 struct v4l2_ctrl *auto_exposure; 225 struct v4l2_ctrl *exposure; 226 }; 227 struct { 228 /* saturation/hue cluster */ 229 struct v4l2_ctrl *saturation; 230 struct v4l2_ctrl *hue; 231 }; 232 struct v4l2_mbus_framefmt format; 233 struct ov7670_format_struct *fmt; /* Current format */ 234 struct ov7670_win_size *wsize; 235 struct clk *clk; 236 int on; 237 struct gpio_desc *resetb_gpio; 238 struct gpio_desc *pwdn_gpio; 239 unsigned int mbus_config; /* Media bus configuration flags */ 240 int min_width; /* Filter out smaller sizes */ 241 int min_height; /* Filter out smaller sizes */ 242 int clock_speed; /* External clock speed (MHz) */ 243 u8 clkrc; /* Clock divider value */ 244 bool use_smbus; /* Use smbus I/O instead of I2C */ 245 bool pll_bypass; 246 bool pclk_hb_disable; 247 const struct ov7670_devtype *devtype; /* Device specifics */ 248 }; 249 250 static inline struct ov7670_info *to_state(struct v4l2_subdev *sd) 251 { 252 return container_of(sd, struct ov7670_info, sd); 253 } 254 255 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 256 { 257 return &container_of(ctrl->handler, struct ov7670_info, hdl)->sd; 258 } 259 260 261 262 /* 263 * The default register settings, as obtained from OmniVision. There 264 * is really no making sense of most of these - lots of "reserved" values 265 * and such. 266 * 267 * These settings give VGA YUYV. 268 */ 269 270 struct regval_list { 271 unsigned char reg_num; 272 unsigned char value; 273 }; 274 275 static struct regval_list ov7670_default_regs[] = { 276 { REG_COM7, COM7_RESET }, 277 /* 278 * Clock scale: 3 = 15fps 279 * 2 = 20fps 280 * 1 = 30fps 281 */ 282 { REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */ 283 { REG_TSLB, 0x04 }, /* OV */ 284 { REG_COM7, 0 }, /* VGA */ 285 /* 286 * Set the hardware window. These values from OV don't entirely 287 * make sense - hstop is less than hstart. But they work... 288 */ 289 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 }, 290 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 }, 291 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a }, 292 293 { REG_COM3, 0 }, { REG_COM14, 0 }, 294 /* Mystery scaling numbers */ 295 { REG_SCALING_XSC, 0x3a }, 296 { REG_SCALING_YSC, 0x35 }, 297 { 0x72, 0x11 }, { 0x73, 0xf0 }, 298 { 0xa2, 0x02 }, { REG_COM10, 0x0 }, 299 300 /* Gamma curve values */ 301 { 0x7a, 0x20 }, { 0x7b, 0x10 }, 302 { 0x7c, 0x1e }, { 0x7d, 0x35 }, 303 { 0x7e, 0x5a }, { 0x7f, 0x69 }, 304 { 0x80, 0x76 }, { 0x81, 0x80 }, 305 { 0x82, 0x88 }, { 0x83, 0x8f }, 306 { 0x84, 0x96 }, { 0x85, 0xa3 }, 307 { 0x86, 0xaf }, { 0x87, 0xc4 }, 308 { 0x88, 0xd7 }, { 0x89, 0xe8 }, 309 310 /* AGC and AEC parameters. Note we start by disabling those features, 311 then turn them only after tweaking the values. */ 312 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT }, 313 { REG_GAIN, 0 }, { REG_AECH, 0 }, 314 { REG_COM4, 0x40 }, /* magic reserved bit */ 315 { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */ 316 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 }, 317 { REG_AEW, 0x95 }, { REG_AEB, 0x33 }, 318 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 }, 319 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */ 320 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 }, 321 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 }, 322 { REG_HAECC7, 0x94 }, 323 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC }, 324 325 /* Almost all of these are magic "reserved" values. */ 326 { REG_COM5, 0x61 }, { REG_COM6, 0x4b }, 327 { 0x16, 0x02 }, { REG_MVFP, 0x07 }, 328 { 0x21, 0x02 }, { 0x22, 0x91 }, 329 { 0x29, 0x07 }, { 0x33, 0x0b }, 330 { 0x35, 0x0b }, { 0x37, 0x1d }, 331 { 0x38, 0x71 }, { 0x39, 0x2a }, 332 { REG_COM12, 0x78 }, { 0x4d, 0x40 }, 333 { 0x4e, 0x20 }, { REG_GFIX, 0 }, 334 { 0x6b, 0x4a }, { 0x74, 0x10 }, 335 { 0x8d, 0x4f }, { 0x8e, 0 }, 336 { 0x8f, 0 }, { 0x90, 0 }, 337 { 0x91, 0 }, { 0x96, 0 }, 338 { 0x9a, 0 }, { 0xb0, 0x84 }, 339 { 0xb1, 0x0c }, { 0xb2, 0x0e }, 340 { 0xb3, 0x82 }, { 0xb8, 0x0a }, 341 342 /* More reserved magic, some of which tweaks white balance */ 343 { 0x43, 0x0a }, { 0x44, 0xf0 }, 344 { 0x45, 0x34 }, { 0x46, 0x58 }, 345 { 0x47, 0x28 }, { 0x48, 0x3a }, 346 { 0x59, 0x88 }, { 0x5a, 0x88 }, 347 { 0x5b, 0x44 }, { 0x5c, 0x67 }, 348 { 0x5d, 0x49 }, { 0x5e, 0x0e }, 349 { 0x6c, 0x0a }, { 0x6d, 0x55 }, 350 { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */ 351 { 0x6a, 0x40 }, { REG_BLUE, 0x40 }, 352 { REG_RED, 0x60 }, 353 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB }, 354 355 /* Matrix coefficients */ 356 { 0x4f, 0x80 }, { 0x50, 0x80 }, 357 { 0x51, 0 }, { 0x52, 0x22 }, 358 { 0x53, 0x5e }, { 0x54, 0x80 }, 359 { 0x58, 0x9e }, 360 361 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 }, 362 { 0x75, 0x05 }, { 0x76, 0xe1 }, 363 { 0x4c, 0 }, { 0x77, 0x01 }, 364 { REG_COM13, 0xc3 }, { 0x4b, 0x09 }, 365 { 0xc9, 0x60 }, { REG_COM16, 0x38 }, 366 { 0x56, 0x40 }, 367 368 { 0x34, 0x11 }, { REG_COM11, COM11_EXP|COM11_HZAUTO }, 369 { 0xa4, 0x88 }, { 0x96, 0 }, 370 { 0x97, 0x30 }, { 0x98, 0x20 }, 371 { 0x99, 0x30 }, { 0x9a, 0x84 }, 372 { 0x9b, 0x29 }, { 0x9c, 0x03 }, 373 { 0x9d, 0x4c }, { 0x9e, 0x3f }, 374 { 0x78, 0x04 }, 375 376 /* Extra-weird stuff. Some sort of multiplexor register */ 377 { 0x79, 0x01 }, { 0xc8, 0xf0 }, 378 { 0x79, 0x0f }, { 0xc8, 0x00 }, 379 { 0x79, 0x10 }, { 0xc8, 0x7e }, 380 { 0x79, 0x0a }, { 0xc8, 0x80 }, 381 { 0x79, 0x0b }, { 0xc8, 0x01 }, 382 { 0x79, 0x0c }, { 0xc8, 0x0f }, 383 { 0x79, 0x0d }, { 0xc8, 0x20 }, 384 { 0x79, 0x09 }, { 0xc8, 0x80 }, 385 { 0x79, 0x02 }, { 0xc8, 0xc0 }, 386 { 0x79, 0x03 }, { 0xc8, 0x40 }, 387 { 0x79, 0x05 }, { 0xc8, 0x30 }, 388 { 0x79, 0x26 }, 389 390 { 0xff, 0xff }, /* END MARKER */ 391 }; 392 393 394 /* 395 * Here we'll try to encapsulate the changes for just the output 396 * video format. 397 * 398 * RGB656 and YUV422 come from OV; RGB444 is homebrewed. 399 * 400 * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why. 401 */ 402 403 404 static struct regval_list ov7670_fmt_yuv422[] = { 405 { REG_COM7, 0x0 }, /* Selects YUV mode */ 406 { REG_RGB444, 0 }, /* No RGB444 please */ 407 { REG_COM1, 0 }, /* CCIR601 */ 408 { REG_COM15, COM15_R00FF }, 409 { REG_COM9, 0x48 }, /* 32x gain ceiling; 0x8 is reserved bit */ 410 { 0x4f, 0x80 }, /* "matrix coefficient 1" */ 411 { 0x50, 0x80 }, /* "matrix coefficient 2" */ 412 { 0x51, 0 }, /* vb */ 413 { 0x52, 0x22 }, /* "matrix coefficient 4" */ 414 { 0x53, 0x5e }, /* "matrix coefficient 5" */ 415 { 0x54, 0x80 }, /* "matrix coefficient 6" */ 416 { REG_COM13, COM13_GAMMA|COM13_UVSAT }, 417 { 0xff, 0xff }, 418 }; 419 420 static struct regval_list ov7670_fmt_rgb565[] = { 421 { REG_COM7, COM7_RGB }, /* Selects RGB mode */ 422 { REG_RGB444, 0 }, /* No RGB444 please */ 423 { REG_COM1, 0x0 }, /* CCIR601 */ 424 { REG_COM15, COM15_RGB565 }, 425 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */ 426 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */ 427 { 0x50, 0xb3 }, /* "matrix coefficient 2" */ 428 { 0x51, 0 }, /* vb */ 429 { 0x52, 0x3d }, /* "matrix coefficient 4" */ 430 { 0x53, 0xa7 }, /* "matrix coefficient 5" */ 431 { 0x54, 0xe4 }, /* "matrix coefficient 6" */ 432 { REG_COM13, COM13_GAMMA|COM13_UVSAT }, 433 { 0xff, 0xff }, 434 }; 435 436 static struct regval_list ov7670_fmt_rgb444[] = { 437 { REG_COM7, COM7_RGB }, /* Selects RGB mode */ 438 { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */ 439 { REG_COM1, 0x0 }, /* CCIR601 */ 440 { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */ 441 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */ 442 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */ 443 { 0x50, 0xb3 }, /* "matrix coefficient 2" */ 444 { 0x51, 0 }, /* vb */ 445 { 0x52, 0x3d }, /* "matrix coefficient 4" */ 446 { 0x53, 0xa7 }, /* "matrix coefficient 5" */ 447 { 0x54, 0xe4 }, /* "matrix coefficient 6" */ 448 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */ 449 { 0xff, 0xff }, 450 }; 451 452 static struct regval_list ov7670_fmt_raw[] = { 453 { REG_COM7, COM7_BAYER }, 454 { REG_COM13, 0x08 }, /* No gamma, magic rsvd bit */ 455 { REG_COM16, 0x3d }, /* Edge enhancement, denoise */ 456 { REG_REG76, 0xe1 }, /* Pix correction, magic rsvd */ 457 { 0xff, 0xff }, 458 }; 459 460 461 462 /* 463 * Low-level register I/O. 464 * 465 * Note that there are two versions of these. On the XO 1, the 466 * i2c controller only does SMBUS, so that's what we use. The 467 * ov7670 is not really an SMBUS device, though, so the communication 468 * is not always entirely reliable. 469 */ 470 static int ov7670_read_smbus(struct v4l2_subdev *sd, unsigned char reg, 471 unsigned char *value) 472 { 473 struct i2c_client *client = v4l2_get_subdevdata(sd); 474 int ret; 475 476 ret = i2c_smbus_read_byte_data(client, reg); 477 if (ret >= 0) { 478 *value = (unsigned char)ret; 479 ret = 0; 480 } 481 return ret; 482 } 483 484 485 static int ov7670_write_smbus(struct v4l2_subdev *sd, unsigned char reg, 486 unsigned char value) 487 { 488 struct i2c_client *client = v4l2_get_subdevdata(sd); 489 int ret = i2c_smbus_write_byte_data(client, reg, value); 490 491 if (reg == REG_COM7 && (value & COM7_RESET)) 492 msleep(5); /* Wait for reset to run */ 493 return ret; 494 } 495 496 /* 497 * On most platforms, we'd rather do straight i2c I/O. 498 */ 499 static int ov7670_read_i2c(struct v4l2_subdev *sd, unsigned char reg, 500 unsigned char *value) 501 { 502 struct i2c_client *client = v4l2_get_subdevdata(sd); 503 u8 data = reg; 504 struct i2c_msg msg; 505 int ret; 506 507 /* 508 * Send out the register address... 509 */ 510 msg.addr = client->addr; 511 msg.flags = 0; 512 msg.len = 1; 513 msg.buf = &data; 514 ret = i2c_transfer(client->adapter, &msg, 1); 515 if (ret < 0) { 516 printk(KERN_ERR "Error %d on register write\n", ret); 517 return ret; 518 } 519 /* 520 * ...then read back the result. 521 */ 522 msg.flags = I2C_M_RD; 523 ret = i2c_transfer(client->adapter, &msg, 1); 524 if (ret >= 0) { 525 *value = data; 526 ret = 0; 527 } 528 return ret; 529 } 530 531 532 static int ov7670_write_i2c(struct v4l2_subdev *sd, unsigned char reg, 533 unsigned char value) 534 { 535 struct i2c_client *client = v4l2_get_subdevdata(sd); 536 struct i2c_msg msg; 537 unsigned char data[2] = { reg, value }; 538 int ret; 539 540 msg.addr = client->addr; 541 msg.flags = 0; 542 msg.len = 2; 543 msg.buf = data; 544 ret = i2c_transfer(client->adapter, &msg, 1); 545 if (ret > 0) 546 ret = 0; 547 if (reg == REG_COM7 && (value & COM7_RESET)) 548 msleep(5); /* Wait for reset to run */ 549 return ret; 550 } 551 552 static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg, 553 unsigned char *value) 554 { 555 struct ov7670_info *info = to_state(sd); 556 557 if (info->use_smbus) 558 return ov7670_read_smbus(sd, reg, value); 559 else 560 return ov7670_read_i2c(sd, reg, value); 561 } 562 563 static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg, 564 unsigned char value) 565 { 566 struct ov7670_info *info = to_state(sd); 567 568 if (info->use_smbus) 569 return ov7670_write_smbus(sd, reg, value); 570 else 571 return ov7670_write_i2c(sd, reg, value); 572 } 573 574 static int ov7670_update_bits(struct v4l2_subdev *sd, unsigned char reg, 575 unsigned char mask, unsigned char value) 576 { 577 unsigned char orig; 578 int ret; 579 580 ret = ov7670_read(sd, reg, &orig); 581 if (ret) 582 return ret; 583 584 return ov7670_write(sd, reg, (orig & ~mask) | (value & mask)); 585 } 586 587 /* 588 * Write a list of register settings; ff/ff stops the process. 589 */ 590 static int ov7670_write_array(struct v4l2_subdev *sd, struct regval_list *vals) 591 { 592 while (vals->reg_num != 0xff || vals->value != 0xff) { 593 int ret = ov7670_write(sd, vals->reg_num, vals->value); 594 595 if (ret < 0) 596 return ret; 597 vals++; 598 } 599 return 0; 600 } 601 602 603 /* 604 * Stuff that knows about the sensor. 605 */ 606 static int ov7670_reset(struct v4l2_subdev *sd, u32 val) 607 { 608 ov7670_write(sd, REG_COM7, COM7_RESET); 609 msleep(1); 610 return 0; 611 } 612 613 614 static int ov7670_init(struct v4l2_subdev *sd, u32 val) 615 { 616 return ov7670_write_array(sd, ov7670_default_regs); 617 } 618 619 static int ov7670_detect(struct v4l2_subdev *sd) 620 { 621 unsigned char v; 622 int ret; 623 624 ret = ov7670_init(sd, 0); 625 if (ret < 0) 626 return ret; 627 ret = ov7670_read(sd, REG_MIDH, &v); 628 if (ret < 0) 629 return ret; 630 if (v != 0x7f) /* OV manuf. id. */ 631 return -ENODEV; 632 ret = ov7670_read(sd, REG_MIDL, &v); 633 if (ret < 0) 634 return ret; 635 if (v != 0xa2) 636 return -ENODEV; 637 /* 638 * OK, we know we have an OmniVision chip...but which one? 639 */ 640 ret = ov7670_read(sd, REG_PID, &v); 641 if (ret < 0) 642 return ret; 643 if (v != 0x76) /* PID + VER = 0x76 / 0x73 */ 644 return -ENODEV; 645 ret = ov7670_read(sd, REG_VER, &v); 646 if (ret < 0) 647 return ret; 648 if (v != 0x73) /* PID + VER = 0x76 / 0x73 */ 649 return -ENODEV; 650 return 0; 651 } 652 653 654 /* 655 * Store information about the video data format. The color matrix 656 * is deeply tied into the format, so keep the relevant values here. 657 * The magic matrix numbers come from OmniVision. 658 */ 659 static struct ov7670_format_struct { 660 u32 mbus_code; 661 enum v4l2_colorspace colorspace; 662 struct regval_list *regs; 663 int cmatrix[CMATRIX_LEN]; 664 } ov7670_formats[] = { 665 { 666 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8, 667 .colorspace = V4L2_COLORSPACE_SRGB, 668 .regs = ov7670_fmt_yuv422, 669 .cmatrix = { 128, -128, 0, -34, -94, 128 }, 670 }, 671 { 672 .mbus_code = MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE, 673 .colorspace = V4L2_COLORSPACE_SRGB, 674 .regs = ov7670_fmt_rgb444, 675 .cmatrix = { 179, -179, 0, -61, -176, 228 }, 676 }, 677 { 678 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE, 679 .colorspace = V4L2_COLORSPACE_SRGB, 680 .regs = ov7670_fmt_rgb565, 681 .cmatrix = { 179, -179, 0, -61, -176, 228 }, 682 }, 683 { 684 .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8, 685 .colorspace = V4L2_COLORSPACE_SRGB, 686 .regs = ov7670_fmt_raw, 687 .cmatrix = { 0, 0, 0, 0, 0, 0 }, 688 }, 689 }; 690 #define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats) 691 692 693 /* 694 * Then there is the issue of window sizes. Try to capture the info here. 695 */ 696 697 /* 698 * QCIF mode is done (by OV) in a very strange way - it actually looks like 699 * VGA with weird scaling options - they do *not* use the canned QCIF mode 700 * which is allegedly provided by the sensor. So here's the weird register 701 * settings. 702 */ 703 static struct regval_list ov7670_qcif_regs[] = { 704 { REG_COM3, COM3_SCALEEN|COM3_DCWEN }, 705 { REG_COM3, COM3_DCWEN }, 706 { REG_COM14, COM14_DCWEN | 0x01}, 707 { 0x73, 0xf1 }, 708 { 0xa2, 0x52 }, 709 { 0x7b, 0x1c }, 710 { 0x7c, 0x28 }, 711 { 0x7d, 0x3c }, 712 { 0x7f, 0x69 }, 713 { REG_COM9, 0x38 }, 714 { 0xa1, 0x0b }, 715 { 0x74, 0x19 }, 716 { 0x9a, 0x80 }, 717 { 0x43, 0x14 }, 718 { REG_COM13, 0xc0 }, 719 { 0xff, 0xff }, 720 }; 721 722 static struct ov7670_win_size ov7670_win_sizes[] = { 723 /* VGA */ 724 { 725 .width = VGA_WIDTH, 726 .height = VGA_HEIGHT, 727 .com7_bit = COM7_FMT_VGA, 728 .hstart = 158, /* These values from */ 729 .hstop = 14, /* Omnivision */ 730 .vstart = 10, 731 .vstop = 490, 732 .regs = NULL, 733 }, 734 /* CIF */ 735 { 736 .width = CIF_WIDTH, 737 .height = CIF_HEIGHT, 738 .com7_bit = COM7_FMT_CIF, 739 .hstart = 170, /* Empirically determined */ 740 .hstop = 90, 741 .vstart = 14, 742 .vstop = 494, 743 .regs = NULL, 744 }, 745 /* QVGA */ 746 { 747 .width = QVGA_WIDTH, 748 .height = QVGA_HEIGHT, 749 .com7_bit = COM7_FMT_QVGA, 750 .hstart = 168, /* Empirically determined */ 751 .hstop = 24, 752 .vstart = 12, 753 .vstop = 492, 754 .regs = NULL, 755 }, 756 /* QCIF */ 757 { 758 .width = QCIF_WIDTH, 759 .height = QCIF_HEIGHT, 760 .com7_bit = COM7_FMT_VGA, /* see comment above */ 761 .hstart = 456, /* Empirically determined */ 762 .hstop = 24, 763 .vstart = 14, 764 .vstop = 494, 765 .regs = ov7670_qcif_regs, 766 } 767 }; 768 769 static struct ov7670_win_size ov7675_win_sizes[] = { 770 /* 771 * Currently, only VGA is supported. Theoretically it could be possible 772 * to support CIF, QVGA and QCIF too. Taking values for ov7670 as a 773 * base and tweak them empirically could be required. 774 */ 775 { 776 .width = VGA_WIDTH, 777 .height = VGA_HEIGHT, 778 .com7_bit = COM7_FMT_VGA, 779 .hstart = 158, /* These values from */ 780 .hstop = 14, /* Omnivision */ 781 .vstart = 14, /* Empirically determined */ 782 .vstop = 494, 783 .regs = NULL, 784 } 785 }; 786 787 static void ov7675_get_framerate(struct v4l2_subdev *sd, 788 struct v4l2_fract *tpf) 789 { 790 struct ov7670_info *info = to_state(sd); 791 u32 clkrc = info->clkrc; 792 int pll_factor; 793 794 if (info->pll_bypass) 795 pll_factor = 1; 796 else 797 pll_factor = PLL_FACTOR; 798 799 clkrc++; 800 if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8) 801 clkrc = (clkrc >> 1); 802 803 tpf->numerator = 1; 804 tpf->denominator = (5 * pll_factor * info->clock_speed) / 805 (4 * clkrc); 806 } 807 808 static int ov7675_apply_framerate(struct v4l2_subdev *sd) 809 { 810 struct ov7670_info *info = to_state(sd); 811 int ret; 812 813 ret = ov7670_write(sd, REG_CLKRC, info->clkrc); 814 if (ret < 0) 815 return ret; 816 817 return ov7670_write(sd, REG_DBLV, 818 info->pll_bypass ? DBLV_BYPASS : DBLV_X4); 819 } 820 821 static int ov7675_set_framerate(struct v4l2_subdev *sd, 822 struct v4l2_fract *tpf) 823 { 824 struct ov7670_info *info = to_state(sd); 825 u32 clkrc; 826 int pll_factor; 827 828 /* 829 * The formula is fps = 5/4*pixclk for YUV/RGB and 830 * fps = 5/2*pixclk for RAW. 831 * 832 * pixclk = clock_speed / (clkrc + 1) * PLLfactor 833 * 834 */ 835 if (tpf->numerator == 0 || tpf->denominator == 0) { 836 clkrc = 0; 837 } else { 838 pll_factor = info->pll_bypass ? 1 : PLL_FACTOR; 839 clkrc = (5 * pll_factor * info->clock_speed * tpf->numerator) / 840 (4 * tpf->denominator); 841 if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8) 842 clkrc = (clkrc << 1); 843 clkrc--; 844 } 845 846 /* 847 * The datasheet claims that clkrc = 0 will divide the input clock by 1 848 * but we've checked with an oscilloscope that it divides by 2 instead. 849 * So, if clkrc = 0 just bypass the divider. 850 */ 851 if (clkrc <= 0) 852 clkrc = CLK_EXT; 853 else if (clkrc > CLK_SCALE) 854 clkrc = CLK_SCALE; 855 info->clkrc = clkrc; 856 857 /* Recalculate frame rate */ 858 ov7675_get_framerate(sd, tpf); 859 860 /* 861 * If the device is not powered up by the host driver do 862 * not apply any changes to H/W at this time. Instead 863 * the framerate will be restored right after power-up. 864 */ 865 if (info->on) 866 return ov7675_apply_framerate(sd); 867 868 return 0; 869 } 870 871 static void ov7670_get_framerate_legacy(struct v4l2_subdev *sd, 872 struct v4l2_fract *tpf) 873 { 874 struct ov7670_info *info = to_state(sd); 875 876 tpf->numerator = 1; 877 tpf->denominator = info->clock_speed; 878 if ((info->clkrc & CLK_EXT) == 0 && (info->clkrc & CLK_SCALE) > 1) 879 tpf->denominator /= (info->clkrc & CLK_SCALE); 880 } 881 882 static int ov7670_set_framerate_legacy(struct v4l2_subdev *sd, 883 struct v4l2_fract *tpf) 884 { 885 struct ov7670_info *info = to_state(sd); 886 int div; 887 888 if (tpf->numerator == 0 || tpf->denominator == 0) 889 div = 1; /* Reset to full rate */ 890 else 891 div = (tpf->numerator * info->clock_speed) / tpf->denominator; 892 if (div == 0) 893 div = 1; 894 else if (div > CLK_SCALE) 895 div = CLK_SCALE; 896 info->clkrc = (info->clkrc & 0x80) | div; 897 tpf->numerator = 1; 898 tpf->denominator = info->clock_speed / div; 899 900 /* 901 * If the device is not powered up by the host driver do 902 * not apply any changes to H/W at this time. Instead 903 * the framerate will be restored right after power-up. 904 */ 905 if (info->on) 906 return ov7670_write(sd, REG_CLKRC, info->clkrc); 907 908 return 0; 909 } 910 911 /* 912 * Store a set of start/stop values into the camera. 913 */ 914 static int ov7670_set_hw(struct v4l2_subdev *sd, int hstart, int hstop, 915 int vstart, int vstop) 916 { 917 int ret; 918 unsigned char v; 919 /* 920 * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of 921 * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is 922 * a mystery "edge offset" value in the top two bits of href. 923 */ 924 ret = ov7670_write(sd, REG_HSTART, (hstart >> 3) & 0xff); 925 if (ret) 926 return ret; 927 ret = ov7670_write(sd, REG_HSTOP, (hstop >> 3) & 0xff); 928 if (ret) 929 return ret; 930 ret = ov7670_read(sd, REG_HREF, &v); 931 if (ret) 932 return ret; 933 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7); 934 msleep(10); 935 ret = ov7670_write(sd, REG_HREF, v); 936 if (ret) 937 return ret; 938 /* Vertical: similar arrangement, but only 10 bits. */ 939 ret = ov7670_write(sd, REG_VSTART, (vstart >> 2) & 0xff); 940 if (ret) 941 return ret; 942 ret = ov7670_write(sd, REG_VSTOP, (vstop >> 2) & 0xff); 943 if (ret) 944 return ret; 945 ret = ov7670_read(sd, REG_VREF, &v); 946 if (ret) 947 return ret; 948 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3); 949 msleep(10); 950 return ov7670_write(sd, REG_VREF, v); 951 } 952 953 954 static int ov7670_enum_mbus_code(struct v4l2_subdev *sd, 955 struct v4l2_subdev_state *sd_state, 956 struct v4l2_subdev_mbus_code_enum *code) 957 { 958 if (code->pad || code->index >= N_OV7670_FMTS) 959 return -EINVAL; 960 961 code->code = ov7670_formats[code->index].mbus_code; 962 return 0; 963 } 964 965 static int ov7670_try_fmt_internal(struct v4l2_subdev *sd, 966 struct v4l2_mbus_framefmt *fmt, 967 struct ov7670_format_struct **ret_fmt, 968 struct ov7670_win_size **ret_wsize) 969 { 970 int index, i; 971 struct ov7670_win_size *wsize; 972 struct ov7670_info *info = to_state(sd); 973 unsigned int n_win_sizes = info->devtype->n_win_sizes; 974 unsigned int win_sizes_limit = n_win_sizes; 975 976 for (index = 0; index < N_OV7670_FMTS; index++) 977 if (ov7670_formats[index].mbus_code == fmt->code) 978 break; 979 if (index >= N_OV7670_FMTS) { 980 /* default to first format */ 981 index = 0; 982 fmt->code = ov7670_formats[0].mbus_code; 983 } 984 if (ret_fmt != NULL) 985 *ret_fmt = ov7670_formats + index; 986 /* 987 * Fields: the OV devices claim to be progressive. 988 */ 989 fmt->field = V4L2_FIELD_NONE; 990 991 /* 992 * Don't consider values that don't match min_height and min_width 993 * constraints. 994 */ 995 if (info->min_width || info->min_height) 996 for (i = 0; i < n_win_sizes; i++) { 997 wsize = info->devtype->win_sizes + i; 998 999 if (wsize->width < info->min_width || 1000 wsize->height < info->min_height) { 1001 win_sizes_limit = i; 1002 break; 1003 } 1004 } 1005 /* 1006 * Round requested image size down to the nearest 1007 * we support, but not below the smallest. 1008 */ 1009 for (wsize = info->devtype->win_sizes; 1010 wsize < info->devtype->win_sizes + win_sizes_limit; wsize++) 1011 if (fmt->width >= wsize->width && fmt->height >= wsize->height) 1012 break; 1013 if (wsize >= info->devtype->win_sizes + win_sizes_limit) 1014 wsize--; /* Take the smallest one */ 1015 if (ret_wsize != NULL) 1016 *ret_wsize = wsize; 1017 /* 1018 * Note the size we'll actually handle. 1019 */ 1020 fmt->width = wsize->width; 1021 fmt->height = wsize->height; 1022 fmt->colorspace = ov7670_formats[index].colorspace; 1023 1024 info->format = *fmt; 1025 1026 return 0; 1027 } 1028 1029 static int ov7670_apply_fmt(struct v4l2_subdev *sd) 1030 { 1031 struct ov7670_info *info = to_state(sd); 1032 struct ov7670_win_size *wsize = info->wsize; 1033 unsigned char com7, com10 = 0; 1034 int ret; 1035 1036 /* 1037 * COM7 is a pain in the ass, it doesn't like to be read then 1038 * quickly written afterward. But we have everything we need 1039 * to set it absolutely here, as long as the format-specific 1040 * register sets list it first. 1041 */ 1042 com7 = info->fmt->regs[0].value; 1043 com7 |= wsize->com7_bit; 1044 ret = ov7670_write(sd, REG_COM7, com7); 1045 if (ret) 1046 return ret; 1047 1048 /* 1049 * Configure the media bus through COM10 register 1050 */ 1051 if (info->mbus_config & V4L2_MBUS_VSYNC_ACTIVE_LOW) 1052 com10 |= COM10_VS_NEG; 1053 if (info->mbus_config & V4L2_MBUS_HSYNC_ACTIVE_LOW) 1054 com10 |= COM10_HREF_REV; 1055 if (info->pclk_hb_disable) 1056 com10 |= COM10_PCLK_HB; 1057 ret = ov7670_write(sd, REG_COM10, com10); 1058 if (ret) 1059 return ret; 1060 1061 /* 1062 * Now write the rest of the array. Also store start/stops 1063 */ 1064 ret = ov7670_write_array(sd, info->fmt->regs + 1); 1065 if (ret) 1066 return ret; 1067 1068 ret = ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart, 1069 wsize->vstop); 1070 if (ret) 1071 return ret; 1072 1073 if (wsize->regs) { 1074 ret = ov7670_write_array(sd, wsize->regs); 1075 if (ret) 1076 return ret; 1077 } 1078 1079 /* 1080 * If we're running RGB565, we must rewrite clkrc after setting 1081 * the other parameters or the image looks poor. If we're *not* 1082 * doing RGB565, we must not rewrite clkrc or the image looks 1083 * *really* poor. 1084 * 1085 * (Update) Now that we retain clkrc state, we should be able 1086 * to write it unconditionally, and that will make the frame 1087 * rate persistent too. 1088 */ 1089 ret = ov7670_write(sd, REG_CLKRC, info->clkrc); 1090 if (ret) 1091 return ret; 1092 1093 return 0; 1094 } 1095 1096 /* 1097 * Set a format. 1098 */ 1099 static int ov7670_set_fmt(struct v4l2_subdev *sd, 1100 const struct v4l2_subdev_client_info *ci, 1101 struct v4l2_subdev_state *sd_state, 1102 struct v4l2_subdev_format *format) 1103 { 1104 struct ov7670_info *info = to_state(sd); 1105 struct v4l2_mbus_framefmt *mbus_fmt; 1106 int ret; 1107 1108 if (format->pad) 1109 return -EINVAL; 1110 1111 if (format->which == V4L2_SUBDEV_FORMAT_TRY) { 1112 ret = ov7670_try_fmt_internal(sd, &format->format, NULL, NULL); 1113 if (ret) 1114 return ret; 1115 mbus_fmt = v4l2_subdev_state_get_format(sd_state, format->pad); 1116 *mbus_fmt = format->format; 1117 return 0; 1118 } 1119 1120 ret = ov7670_try_fmt_internal(sd, &format->format, &info->fmt, &info->wsize); 1121 if (ret) 1122 return ret; 1123 1124 /* 1125 * If the device is not powered up by the host driver do 1126 * not apply any changes to H/W at this time. Instead 1127 * the frame format will be restored right after power-up. 1128 */ 1129 if (info->on) 1130 return ov7670_apply_fmt(sd); 1131 1132 return 0; 1133 } 1134 1135 static int ov7670_get_fmt(struct v4l2_subdev *sd, 1136 struct v4l2_subdev_state *sd_state, 1137 struct v4l2_subdev_format *format) 1138 { 1139 struct ov7670_info *info = to_state(sd); 1140 struct v4l2_mbus_framefmt *mbus_fmt; 1141 1142 if (format->which == V4L2_SUBDEV_FORMAT_TRY) { 1143 mbus_fmt = v4l2_subdev_state_get_format(sd_state, 0); 1144 format->format = *mbus_fmt; 1145 return 0; 1146 } else { 1147 format->format = info->format; 1148 } 1149 1150 return 0; 1151 } 1152 1153 /* 1154 * Implement G/S_PARM. There is a "high quality" mode we could try 1155 * to do someday; for now, we just do the frame rate tweak. 1156 */ 1157 static int ov7670_get_frame_interval(struct v4l2_subdev *sd, 1158 struct v4l2_subdev_state *sd_state, 1159 struct v4l2_subdev_frame_interval *ival) 1160 { 1161 struct ov7670_info *info = to_state(sd); 1162 1163 /* 1164 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2 1165 * subdev active state API. 1166 */ 1167 if (ival->which != V4L2_SUBDEV_FORMAT_ACTIVE) 1168 return -EINVAL; 1169 1170 info->devtype->get_framerate(sd, &ival->interval); 1171 1172 return 0; 1173 } 1174 1175 static int ov7670_set_frame_interval(struct v4l2_subdev *sd, 1176 struct v4l2_subdev_state *sd_state, 1177 struct v4l2_subdev_frame_interval *ival) 1178 { 1179 struct v4l2_fract *tpf = &ival->interval; 1180 struct ov7670_info *info = to_state(sd); 1181 1182 /* 1183 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2 1184 * subdev active state API. 1185 */ 1186 if (ival->which != V4L2_SUBDEV_FORMAT_ACTIVE) 1187 return -EINVAL; 1188 1189 return info->devtype->set_framerate(sd, tpf); 1190 } 1191 1192 1193 /* 1194 * Frame intervals. Since frame rates are controlled with the clock 1195 * divider, we can only do 30/n for integer n values. So no continuous 1196 * or stepwise options. Here we just pick a handful of logical values. 1197 */ 1198 1199 static int ov7670_frame_rates[] = { 30, 15, 10, 5, 1 }; 1200 1201 static int ov7670_enum_frame_interval(struct v4l2_subdev *sd, 1202 struct v4l2_subdev_state *sd_state, 1203 struct v4l2_subdev_frame_interval_enum *fie) 1204 { 1205 struct ov7670_info *info = to_state(sd); 1206 unsigned int n_win_sizes = info->devtype->n_win_sizes; 1207 int i; 1208 1209 if (fie->pad) 1210 return -EINVAL; 1211 if (fie->index >= ARRAY_SIZE(ov7670_frame_rates)) 1212 return -EINVAL; 1213 1214 /* 1215 * Check if the width/height is valid. 1216 * 1217 * If a minimum width/height was requested, filter out the capture 1218 * windows that fall outside that. 1219 */ 1220 for (i = 0; i < n_win_sizes; i++) { 1221 struct ov7670_win_size *win = &info->devtype->win_sizes[i]; 1222 1223 if (info->min_width && win->width < info->min_width) 1224 continue; 1225 if (info->min_height && win->height < info->min_height) 1226 continue; 1227 if (fie->width == win->width && fie->height == win->height) 1228 break; 1229 } 1230 if (i == n_win_sizes) 1231 return -EINVAL; 1232 fie->interval.numerator = 1; 1233 fie->interval.denominator = ov7670_frame_rates[fie->index]; 1234 return 0; 1235 } 1236 1237 /* 1238 * Frame size enumeration 1239 */ 1240 static int ov7670_enum_frame_size(struct v4l2_subdev *sd, 1241 struct v4l2_subdev_state *sd_state, 1242 struct v4l2_subdev_frame_size_enum *fse) 1243 { 1244 struct ov7670_info *info = to_state(sd); 1245 int i; 1246 int num_valid = -1; 1247 __u32 index = fse->index; 1248 unsigned int n_win_sizes = info->devtype->n_win_sizes; 1249 1250 if (fse->pad) 1251 return -EINVAL; 1252 1253 /* 1254 * If a minimum width/height was requested, filter out the capture 1255 * windows that fall outside that. 1256 */ 1257 for (i = 0; i < n_win_sizes; i++) { 1258 struct ov7670_win_size *win = &info->devtype->win_sizes[i]; 1259 1260 if (info->min_width && win->width < info->min_width) 1261 continue; 1262 if (info->min_height && win->height < info->min_height) 1263 continue; 1264 if (index == ++num_valid) { 1265 fse->min_width = fse->max_width = win->width; 1266 fse->min_height = fse->max_height = win->height; 1267 return 0; 1268 } 1269 } 1270 1271 return -EINVAL; 1272 } 1273 1274 /* 1275 * Code for dealing with controls. 1276 */ 1277 1278 static int ov7670_store_cmatrix(struct v4l2_subdev *sd, 1279 int matrix[CMATRIX_LEN]) 1280 { 1281 int i, ret; 1282 unsigned char signbits = 0; 1283 1284 /* 1285 * Weird crap seems to exist in the upper part of 1286 * the sign bits register, so let's preserve it. 1287 */ 1288 ret = ov7670_read(sd, REG_CMATRIX_SIGN, &signbits); 1289 signbits &= 0xc0; 1290 1291 for (i = 0; i < CMATRIX_LEN; i++) { 1292 unsigned char raw; 1293 1294 if (matrix[i] < 0) { 1295 signbits |= (1 << i); 1296 if (matrix[i] < -255) 1297 raw = 0xff; 1298 else 1299 raw = (-1 * matrix[i]) & 0xff; 1300 } else { 1301 if (matrix[i] > 255) 1302 raw = 0xff; 1303 else 1304 raw = matrix[i] & 0xff; 1305 } 1306 ret = ov7670_write(sd, REG_CMATRIX_BASE + i, raw); 1307 if (ret) 1308 return ret; 1309 } 1310 return ov7670_write(sd, REG_CMATRIX_SIGN, signbits); 1311 } 1312 1313 1314 /* 1315 * Hue also requires messing with the color matrix. It also requires 1316 * trig functions, which tend not to be well supported in the kernel. 1317 * So here is a simple table of sine values, 0-90 degrees, in steps 1318 * of five degrees. Values are multiplied by 1000. 1319 * 1320 * The following naive approximate trig functions require an argument 1321 * carefully limited to -180 <= theta <= 180. 1322 */ 1323 #define SIN_STEP 5 1324 static const int ov7670_sin_table[] = { 1325 0, 87, 173, 258, 342, 422, 1326 499, 573, 642, 707, 766, 819, 1327 866, 906, 939, 965, 984, 996, 1328 1000 1329 }; 1330 1331 static int ov7670_sine(int theta) 1332 { 1333 int chs = 1; 1334 int sine; 1335 1336 if (theta < 0) { 1337 theta = -theta; 1338 chs = -1; 1339 } 1340 if (theta <= 90) 1341 sine = ov7670_sin_table[theta/SIN_STEP]; 1342 else { 1343 theta -= 90; 1344 sine = 1000 - ov7670_sin_table[theta/SIN_STEP]; 1345 } 1346 return sine*chs; 1347 } 1348 1349 static int ov7670_cosine(int theta) 1350 { 1351 theta = 90 - theta; 1352 if (theta > 180) 1353 theta -= 360; 1354 else if (theta < -180) 1355 theta += 360; 1356 return ov7670_sine(theta); 1357 } 1358 1359 1360 1361 1362 static void ov7670_calc_cmatrix(struct ov7670_info *info, 1363 int matrix[CMATRIX_LEN], int sat, int hue) 1364 { 1365 int i; 1366 /* 1367 * Apply the current saturation setting first. 1368 */ 1369 for (i = 0; i < CMATRIX_LEN; i++) 1370 matrix[i] = (info->fmt->cmatrix[i] * sat) >> 7; 1371 /* 1372 * Then, if need be, rotate the hue value. 1373 */ 1374 if (hue != 0) { 1375 int sinth, costh, tmpmatrix[CMATRIX_LEN]; 1376 1377 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int)); 1378 sinth = ov7670_sine(hue); 1379 costh = ov7670_cosine(hue); 1380 1381 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000; 1382 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000; 1383 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000; 1384 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000; 1385 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000; 1386 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000; 1387 } 1388 } 1389 1390 1391 1392 static int ov7670_s_sat_hue(struct v4l2_subdev *sd, int sat, int hue) 1393 { 1394 struct ov7670_info *info = to_state(sd); 1395 int matrix[CMATRIX_LEN]; 1396 1397 ov7670_calc_cmatrix(info, matrix, sat, hue); 1398 return ov7670_store_cmatrix(sd, matrix); 1399 } 1400 1401 1402 /* 1403 * Some weird registers seem to store values in a sign/magnitude format! 1404 */ 1405 1406 static unsigned char ov7670_abs_to_sm(unsigned char v) 1407 { 1408 if (v > 127) 1409 return v & 0x7f; 1410 return (128 - v) | 0x80; 1411 } 1412 1413 static int ov7670_s_brightness(struct v4l2_subdev *sd, int value) 1414 { 1415 unsigned char com8 = 0, v; 1416 1417 ov7670_read(sd, REG_COM8, &com8); 1418 com8 &= ~COM8_AEC; 1419 ov7670_write(sd, REG_COM8, com8); 1420 v = ov7670_abs_to_sm(value); 1421 return ov7670_write(sd, REG_BRIGHT, v); 1422 } 1423 1424 static int ov7670_s_contrast(struct v4l2_subdev *sd, int value) 1425 { 1426 return ov7670_write(sd, REG_CONTRAS, (unsigned char) value); 1427 } 1428 1429 static int ov7670_s_hflip(struct v4l2_subdev *sd, int value) 1430 { 1431 unsigned char v = 0; 1432 int ret; 1433 1434 ret = ov7670_read(sd, REG_MVFP, &v); 1435 if (ret) 1436 return ret; 1437 if (value) 1438 v |= MVFP_MIRROR; 1439 else 1440 v &= ~MVFP_MIRROR; 1441 msleep(10); /* FIXME */ 1442 return ov7670_write(sd, REG_MVFP, v); 1443 } 1444 1445 static int ov7670_s_vflip(struct v4l2_subdev *sd, int value) 1446 { 1447 unsigned char v = 0; 1448 int ret; 1449 1450 ret = ov7670_read(sd, REG_MVFP, &v); 1451 if (ret) 1452 return ret; 1453 if (value) 1454 v |= MVFP_FLIP; 1455 else 1456 v &= ~MVFP_FLIP; 1457 msleep(10); /* FIXME */ 1458 return ov7670_write(sd, REG_MVFP, v); 1459 } 1460 1461 /* 1462 * GAIN is split between REG_GAIN and REG_VREF[7:6]. If one believes 1463 * the data sheet, the VREF parts should be the most significant, but 1464 * experience shows otherwise. There seems to be little value in 1465 * messing with the VREF bits, so we leave them alone. 1466 */ 1467 static int ov7670_g_gain(struct v4l2_subdev *sd, __s32 *value) 1468 { 1469 int ret; 1470 unsigned char gain; 1471 1472 ret = ov7670_read(sd, REG_GAIN, &gain); 1473 if (ret) 1474 return ret; 1475 *value = gain; 1476 return 0; 1477 } 1478 1479 static int ov7670_s_gain(struct v4l2_subdev *sd, int value) 1480 { 1481 int ret; 1482 unsigned char com8; 1483 1484 ret = ov7670_write(sd, REG_GAIN, value & 0xff); 1485 if (ret) 1486 return ret; 1487 /* Have to turn off AGC as well */ 1488 ret = ov7670_read(sd, REG_COM8, &com8); 1489 if (ret) 1490 return ret; 1491 return ov7670_write(sd, REG_COM8, com8 & ~COM8_AGC); 1492 } 1493 1494 /* 1495 * Tweak autogain. 1496 */ 1497 static int ov7670_s_autogain(struct v4l2_subdev *sd, int value) 1498 { 1499 int ret; 1500 unsigned char com8; 1501 1502 ret = ov7670_read(sd, REG_COM8, &com8); 1503 if (ret == 0) { 1504 if (value) 1505 com8 |= COM8_AGC; 1506 else 1507 com8 &= ~COM8_AGC; 1508 ret = ov7670_write(sd, REG_COM8, com8); 1509 } 1510 return ret; 1511 } 1512 1513 static int ov7670_s_exp(struct v4l2_subdev *sd, int value) 1514 { 1515 int ret; 1516 unsigned char com1, com8, aech, aechh; 1517 1518 ret = ov7670_read(sd, REG_COM1, &com1) + 1519 ov7670_read(sd, REG_COM8, &com8) + 1520 ov7670_read(sd, REG_AECHH, &aechh); 1521 if (ret) 1522 return ret; 1523 1524 com1 = (com1 & 0xfc) | (value & 0x03); 1525 aech = (value >> 2) & 0xff; 1526 aechh = (aechh & 0xc0) | ((value >> 10) & 0x3f); 1527 ret = ov7670_write(sd, REG_COM1, com1) + 1528 ov7670_write(sd, REG_AECH, aech) + 1529 ov7670_write(sd, REG_AECHH, aechh); 1530 /* Have to turn off AEC as well */ 1531 if (ret == 0) 1532 ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AEC); 1533 return ret; 1534 } 1535 1536 /* 1537 * Tweak autoexposure. 1538 */ 1539 static int ov7670_s_autoexp(struct v4l2_subdev *sd, 1540 enum v4l2_exposure_auto_type value) 1541 { 1542 int ret; 1543 unsigned char com8; 1544 1545 ret = ov7670_read(sd, REG_COM8, &com8); 1546 if (ret == 0) { 1547 if (value == V4L2_EXPOSURE_AUTO) 1548 com8 |= COM8_AEC; 1549 else 1550 com8 &= ~COM8_AEC; 1551 ret = ov7670_write(sd, REG_COM8, com8); 1552 } 1553 return ret; 1554 } 1555 1556 static const char * const ov7670_test_pattern_menu[] = { 1557 "No test output", 1558 "Shifting \"1\"", 1559 "8-bar color bar", 1560 "Fade to gray color bar", 1561 }; 1562 1563 static int ov7670_s_test_pattern(struct v4l2_subdev *sd, int value) 1564 { 1565 int ret; 1566 1567 ret = ov7670_update_bits(sd, REG_SCALING_XSC, TEST_PATTTERN_0, 1568 value & BIT(0) ? TEST_PATTTERN_0 : 0); 1569 if (ret) 1570 return ret; 1571 1572 return ov7670_update_bits(sd, REG_SCALING_YSC, TEST_PATTTERN_1, 1573 value & BIT(1) ? TEST_PATTTERN_1 : 0); 1574 } 1575 1576 static int ov7670_g_volatile_ctrl(struct v4l2_ctrl *ctrl) 1577 { 1578 struct v4l2_subdev *sd = to_sd(ctrl); 1579 struct ov7670_info *info = to_state(sd); 1580 1581 switch (ctrl->id) { 1582 case V4L2_CID_AUTOGAIN: 1583 return ov7670_g_gain(sd, &info->gain->val); 1584 } 1585 return -EINVAL; 1586 } 1587 1588 static int ov7670_s_ctrl(struct v4l2_ctrl *ctrl) 1589 { 1590 struct v4l2_subdev *sd = to_sd(ctrl); 1591 struct ov7670_info *info = to_state(sd); 1592 1593 switch (ctrl->id) { 1594 case V4L2_CID_BRIGHTNESS: 1595 return ov7670_s_brightness(sd, ctrl->val); 1596 case V4L2_CID_CONTRAST: 1597 return ov7670_s_contrast(sd, ctrl->val); 1598 case V4L2_CID_SATURATION: 1599 return ov7670_s_sat_hue(sd, 1600 info->saturation->val, info->hue->val); 1601 case V4L2_CID_VFLIP: 1602 return ov7670_s_vflip(sd, ctrl->val); 1603 case V4L2_CID_HFLIP: 1604 return ov7670_s_hflip(sd, ctrl->val); 1605 case V4L2_CID_AUTOGAIN: 1606 /* Only set manual gain if auto gain is not explicitly 1607 turned on. */ 1608 if (!ctrl->val) { 1609 /* ov7670_s_gain turns off auto gain */ 1610 return ov7670_s_gain(sd, info->gain->val); 1611 } 1612 return ov7670_s_autogain(sd, ctrl->val); 1613 case V4L2_CID_EXPOSURE_AUTO: 1614 /* Only set manual exposure if auto exposure is not explicitly 1615 turned on. */ 1616 if (ctrl->val == V4L2_EXPOSURE_MANUAL) { 1617 /* ov7670_s_exp turns off auto exposure */ 1618 return ov7670_s_exp(sd, info->exposure->val); 1619 } 1620 return ov7670_s_autoexp(sd, ctrl->val); 1621 case V4L2_CID_TEST_PATTERN: 1622 return ov7670_s_test_pattern(sd, ctrl->val); 1623 } 1624 return -EINVAL; 1625 } 1626 1627 static const struct v4l2_ctrl_ops ov7670_ctrl_ops = { 1628 .s_ctrl = ov7670_s_ctrl, 1629 .g_volatile_ctrl = ov7670_g_volatile_ctrl, 1630 }; 1631 1632 #ifdef CONFIG_VIDEO_ADV_DEBUG 1633 static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) 1634 { 1635 unsigned char val = 0; 1636 int ret; 1637 1638 ret = ov7670_read(sd, reg->reg & 0xff, &val); 1639 reg->val = val; 1640 reg->size = 1; 1641 return ret; 1642 } 1643 1644 static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg) 1645 { 1646 ov7670_write(sd, reg->reg & 0xff, reg->val & 0xff); 1647 return 0; 1648 } 1649 #endif 1650 1651 static void ov7670_power_on(struct v4l2_subdev *sd) 1652 { 1653 struct ov7670_info *info = to_state(sd); 1654 1655 if (info->on) 1656 return; 1657 1658 clk_prepare_enable(info->clk); 1659 1660 if (info->pwdn_gpio) 1661 gpiod_set_value(info->pwdn_gpio, 0); 1662 if (info->resetb_gpio) { 1663 gpiod_set_value(info->resetb_gpio, 1); 1664 usleep_range(500, 1000); 1665 gpiod_set_value(info->resetb_gpio, 0); 1666 } 1667 if (info->pwdn_gpio || info->resetb_gpio || info->clk) 1668 usleep_range(3000, 5000); 1669 1670 info->on = true; 1671 } 1672 1673 static void ov7670_power_off(struct v4l2_subdev *sd) 1674 { 1675 struct ov7670_info *info = to_state(sd); 1676 1677 if (!info->on) 1678 return; 1679 1680 clk_disable_unprepare(info->clk); 1681 1682 if (info->pwdn_gpio) 1683 gpiod_set_value(info->pwdn_gpio, 1); 1684 1685 info->on = false; 1686 } 1687 1688 static int ov7670_s_power(struct v4l2_subdev *sd, int on) 1689 { 1690 struct ov7670_info *info = to_state(sd); 1691 1692 if (info->on == on) 1693 return 0; 1694 1695 if (on) { 1696 ov7670_power_on(sd); 1697 ov7670_init(sd, 0); 1698 ov7670_apply_fmt(sd); 1699 ov7675_apply_framerate(sd); 1700 v4l2_ctrl_handler_setup(&info->hdl); 1701 } else { 1702 ov7670_power_off(sd); 1703 } 1704 1705 return 0; 1706 } 1707 1708 static void ov7670_get_default_format(struct v4l2_subdev *sd, 1709 struct v4l2_mbus_framefmt *format) 1710 { 1711 struct ov7670_info *info = to_state(sd); 1712 1713 format->width = info->devtype->win_sizes[0].width; 1714 format->height = info->devtype->win_sizes[0].height; 1715 format->colorspace = info->fmt->colorspace; 1716 format->code = info->fmt->mbus_code; 1717 format->field = V4L2_FIELD_NONE; 1718 } 1719 1720 static int ov7670_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) 1721 { 1722 struct v4l2_mbus_framefmt *format = 1723 v4l2_subdev_state_get_format(fh->state, 0); 1724 1725 ov7670_get_default_format(sd, format); 1726 1727 return 0; 1728 } 1729 1730 /* ----------------------------------------------------------------------- */ 1731 1732 static const struct v4l2_subdev_core_ops ov7670_core_ops = { 1733 .reset = ov7670_reset, 1734 .init = ov7670_init, 1735 .s_power = ov7670_s_power, 1736 .log_status = v4l2_ctrl_subdev_log_status, 1737 .subscribe_event = v4l2_ctrl_subdev_subscribe_event, 1738 .unsubscribe_event = v4l2_event_subdev_unsubscribe, 1739 #ifdef CONFIG_VIDEO_ADV_DEBUG 1740 .g_register = ov7670_g_register, 1741 .s_register = ov7670_s_register, 1742 #endif 1743 }; 1744 1745 static const struct v4l2_subdev_pad_ops ov7670_pad_ops = { 1746 .enum_frame_interval = ov7670_enum_frame_interval, 1747 .enum_frame_size = ov7670_enum_frame_size, 1748 .enum_mbus_code = ov7670_enum_mbus_code, 1749 .get_fmt = ov7670_get_fmt, 1750 .set_fmt = ov7670_set_fmt, 1751 .get_frame_interval = ov7670_get_frame_interval, 1752 .set_frame_interval = ov7670_set_frame_interval, 1753 }; 1754 1755 static const struct v4l2_subdev_ops ov7670_ops = { 1756 .core = &ov7670_core_ops, 1757 .pad = &ov7670_pad_ops, 1758 }; 1759 1760 static const struct v4l2_subdev_internal_ops ov7670_subdev_internal_ops = { 1761 .open = ov7670_open, 1762 }; 1763 1764 /* ----------------------------------------------------------------------- */ 1765 1766 static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info) 1767 { 1768 info->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown", 1769 GPIOD_OUT_LOW); 1770 if (IS_ERR(info->pwdn_gpio)) { 1771 dev_info(&client->dev, "can't get %s GPIO\n", "powerdown"); 1772 return PTR_ERR(info->pwdn_gpio); 1773 } 1774 1775 info->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset", 1776 GPIOD_OUT_LOW); 1777 if (IS_ERR(info->resetb_gpio)) { 1778 dev_info(&client->dev, "can't get %s GPIO\n", "reset"); 1779 return PTR_ERR(info->resetb_gpio); 1780 } 1781 1782 usleep_range(3000, 5000); 1783 1784 return 0; 1785 } 1786 1787 /* 1788 * ov7670_parse_dt() - Parse device tree to collect mbus configuration 1789 * properties 1790 */ 1791 static int ov7670_parse_dt(struct device *dev, 1792 struct ov7670_info *info) 1793 { 1794 struct fwnode_handle *fwnode = dev_fwnode(dev); 1795 struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 }; 1796 struct fwnode_handle *ep; 1797 int ret; 1798 1799 if (!fwnode) 1800 return -EINVAL; 1801 1802 info->pclk_hb_disable = false; 1803 if (fwnode_property_present(fwnode, "ov7670,pclk-hb-disable")) 1804 info->pclk_hb_disable = true; 1805 1806 ep = fwnode_graph_get_next_endpoint(fwnode, NULL); 1807 if (!ep) 1808 return -EINVAL; 1809 1810 ret = v4l2_fwnode_endpoint_parse(ep, &bus_cfg); 1811 fwnode_handle_put(ep); 1812 if (ret) 1813 return ret; 1814 1815 if (bus_cfg.bus_type != V4L2_MBUS_PARALLEL) { 1816 dev_err(dev, "Unsupported media bus type\n"); 1817 return -EINVAL; 1818 } 1819 info->mbus_config = bus_cfg.bus.parallel.flags; 1820 1821 return 0; 1822 } 1823 1824 static int ov7670_probe(struct i2c_client *client) 1825 { 1826 struct v4l2_fract tpf; 1827 struct v4l2_subdev *sd; 1828 struct ov7670_info *info; 1829 int ret; 1830 1831 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL); 1832 if (info == NULL) 1833 return -ENOMEM; 1834 sd = &info->sd; 1835 v4l2_i2c_subdev_init(sd, client, &ov7670_ops); 1836 1837 sd->internal_ops = &ov7670_subdev_internal_ops; 1838 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; 1839 1840 info->clock_speed = 30; /* default: a guess */ 1841 1842 if (dev_fwnode(&client->dev)) { 1843 ret = ov7670_parse_dt(&client->dev, info); 1844 if (ret) 1845 return ret; 1846 1847 } else if (client->dev.platform_data) { 1848 struct ov7670_config *config = client->dev.platform_data; 1849 1850 /* 1851 * Must apply configuration before initializing device, because it 1852 * selects I/O method. 1853 */ 1854 info->min_width = config->min_width; 1855 info->min_height = config->min_height; 1856 info->use_smbus = config->use_smbus; 1857 1858 if (config->clock_speed) 1859 info->clock_speed = config->clock_speed; 1860 1861 if (config->pll_bypass) 1862 info->pll_bypass = true; 1863 1864 if (config->pclk_hb_disable) 1865 info->pclk_hb_disable = true; 1866 } 1867 1868 info->clk = devm_clk_get_optional(&client->dev, "xclk"); 1869 if (IS_ERR(info->clk)) 1870 return PTR_ERR(info->clk); 1871 1872 ret = ov7670_init_gpio(client, info); 1873 if (ret) 1874 return ret; 1875 1876 ov7670_power_on(sd); 1877 1878 if (info->clk) { 1879 info->clock_speed = clk_get_rate(info->clk) / 1000000; 1880 if (info->clock_speed < 10 || info->clock_speed > 48) { 1881 ret = -EINVAL; 1882 goto power_off; 1883 } 1884 } 1885 1886 /* Make sure it's an ov7670 */ 1887 ret = ov7670_detect(sd); 1888 if (ret) { 1889 v4l_dbg(1, debug, client, 1890 "chip found @ 0x%x (%s) is not an ov7670 chip.\n", 1891 client->addr << 1, client->adapter->name); 1892 goto power_off; 1893 } 1894 v4l_info(client, "chip found @ 0x%02x (%s)\n", 1895 client->addr << 1, client->adapter->name); 1896 1897 info->devtype = i2c_get_match_data(client); 1898 info->fmt = &ov7670_formats[0]; 1899 info->wsize = &info->devtype->win_sizes[0]; 1900 1901 ov7670_get_default_format(sd, &info->format); 1902 1903 info->clkrc = 0; 1904 1905 /* Set default frame rate to 30 fps */ 1906 tpf.numerator = 1; 1907 tpf.denominator = 30; 1908 info->devtype->set_framerate(sd, &tpf); 1909 1910 v4l2_ctrl_handler_init(&info->hdl, 10); 1911 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1912 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128); 1913 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1914 V4L2_CID_CONTRAST, 0, 127, 1, 64); 1915 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1916 V4L2_CID_VFLIP, 0, 1, 1, 0); 1917 v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1918 V4L2_CID_HFLIP, 0, 1, 1, 0); 1919 info->saturation = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1920 V4L2_CID_SATURATION, 0, 256, 1, 128); 1921 info->hue = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1922 V4L2_CID_HUE, -180, 180, 5, 0); 1923 info->gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1924 V4L2_CID_GAIN, 0, 255, 1, 128); 1925 info->auto_gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1926 V4L2_CID_AUTOGAIN, 0, 1, 1, 1); 1927 info->exposure = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops, 1928 V4L2_CID_EXPOSURE, 0, 65535, 1, 500); 1929 info->auto_exposure = v4l2_ctrl_new_std_menu(&info->hdl, &ov7670_ctrl_ops, 1930 V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL, 0, 1931 V4L2_EXPOSURE_AUTO); 1932 v4l2_ctrl_new_std_menu_items(&info->hdl, &ov7670_ctrl_ops, 1933 V4L2_CID_TEST_PATTERN, 1934 ARRAY_SIZE(ov7670_test_pattern_menu) - 1, 0, 0, 1935 ov7670_test_pattern_menu); 1936 sd->ctrl_handler = &info->hdl; 1937 if (info->hdl.error) { 1938 ret = info->hdl.error; 1939 1940 goto hdl_free; 1941 } 1942 /* 1943 * We have checked empirically that hw allows to read back the gain 1944 * value chosen by auto gain but that's not the case for auto exposure. 1945 */ 1946 v4l2_ctrl_auto_cluster(2, &info->auto_gain, 0, true); 1947 v4l2_ctrl_auto_cluster(2, &info->auto_exposure, 1948 V4L2_EXPOSURE_MANUAL, false); 1949 v4l2_ctrl_cluster(2, &info->saturation); 1950 1951 info->pad.flags = MEDIA_PAD_FL_SOURCE; 1952 info->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR; 1953 ret = media_entity_pads_init(&info->sd.entity, 1, &info->pad); 1954 if (ret < 0) 1955 goto hdl_free; 1956 1957 v4l2_ctrl_handler_setup(&info->hdl); 1958 1959 ret = v4l2_async_register_subdev(&info->sd); 1960 if (ret < 0) 1961 goto entity_cleanup; 1962 1963 ov7670_power_off(sd); 1964 return 0; 1965 1966 entity_cleanup: 1967 media_entity_cleanup(&info->sd.entity); 1968 hdl_free: 1969 v4l2_ctrl_handler_free(&info->hdl); 1970 power_off: 1971 ov7670_power_off(sd); 1972 return ret; 1973 } 1974 1975 static void ov7670_remove(struct i2c_client *client) 1976 { 1977 struct v4l2_subdev *sd = i2c_get_clientdata(client); 1978 struct ov7670_info *info = to_state(sd); 1979 1980 v4l2_async_unregister_subdev(sd); 1981 v4l2_ctrl_handler_free(&info->hdl); 1982 media_entity_cleanup(&info->sd.entity); 1983 } 1984 1985 static const struct ov7670_devtype ov7670_devdata = { 1986 .win_sizes = ov7670_win_sizes, 1987 .n_win_sizes = ARRAY_SIZE(ov7670_win_sizes), 1988 .set_framerate = ov7670_set_framerate_legacy, 1989 .get_framerate = ov7670_get_framerate_legacy, 1990 }; 1991 1992 static const struct ov7670_devtype ov7675_devdata = { 1993 .win_sizes = ov7675_win_sizes, 1994 .n_win_sizes = ARRAY_SIZE(ov7675_win_sizes), 1995 .set_framerate = ov7675_set_framerate, 1996 .get_framerate = ov7675_get_framerate, 1997 }; 1998 1999 static const struct i2c_device_id ov7670_id[] = { 2000 { .name = "ov7670", .driver_data = (kernel_ulong_t)&ov7670_devdata }, 2001 { .name = "ov7675", .driver_data = (kernel_ulong_t)&ov7675_devdata }, 2002 { /* sentinel */ } 2003 }; 2004 MODULE_DEVICE_TABLE(i2c, ov7670_id); 2005 2006 static const struct of_device_id ov7670_of_match[] = { 2007 { .compatible = "ovti,ov7670", &ov7670_devdata }, 2008 { /* sentinel */ } 2009 }; 2010 MODULE_DEVICE_TABLE(of, ov7670_of_match); 2011 2012 static struct i2c_driver ov7670_driver = { 2013 .driver = { 2014 .name = "ov7670", 2015 .of_match_table = ov7670_of_match, 2016 }, 2017 .probe = ov7670_probe, 2018 .remove = ov7670_remove, 2019 .id_table = ov7670_id, 2020 }; 2021 2022 module_i2c_driver(ov7670_driver); 2023