drivers/media/video/ov7670.c

   1 /*
   2  * A V4L2 driver for OmniVision OV7670 cameras.
   3  *
   4  * Copyright 2006 One Laptop Per Child Association, Inc.  Written
   5  * by Jonathan Corbet with substantial inspiration from Mark
   6  * McClelland's ovcamchip code.
   7  *
   8  * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
   9  *
  10  * This file may be distributed under the terms of the GNU General
  11  * Public License, version 2.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/videodev.h>
  18 #include <media/v4l2-common.h>
  19 #include <media/v4l2-chip-ident.h>
  20 #include <linux/i2c.h>
  21
  22
  23 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
  24 MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
  25 MODULE_LICENSE("GPL");
  26
  27 /*
  28  * Basic window sizes.  These probably belong somewhere more globally
  29  * useful.
  30  */
  31 #define VGA_WIDTH       640
  32 #define VGA_HEIGHT      480
  33 #define QVGA_WIDTH      320
  34 #define QVGA_HEIGHT     240
  35 #define CIF_WIDTH       352
  36 #define CIF_HEIGHT      288
  37 #define QCIF_WIDTH      176
  38 #define QCIF_HEIGHT     144
  39
  40 /*
  41  * Our nominal (default) frame rate.
  42  */
  43 #define OV7670_FRAME_RATE 30
  44
  45 /*
  46  * The 7670 sits on i2c with ID 0x42
  47  */
  48 #define OV7670_I2C_ADDR 0x42
  49
  50 /* Registers */
  51 #define REG_GAIN        0x00    /* Gain lower 8 bits (rest in vref) */
  52 #define REG_BLUE        0x01    /* blue gain */
  53 #define REG_RED         0x02    /* red gain */
  54 #define REG_VREF        0x03    /* Pieces of GAIN, VSTART, VSTOP */
  55 #define REG_COM1        0x04    /* Control 1 */
  56 #define  COM1_CCIR656     0x40  /* CCIR656 enable */
  57 #define REG_BAVE        0x05    /* U/B Average level */
  58 #define REG_GbAVE       0x06    /* Y/Gb Average level */
  59 #define REG_AECHH       0x07    /* AEC MS 5 bits */
  60 #define REG_RAVE        0x08    /* V/R Average level */
  61 #define REG_COM2        0x09    /* Control 2 */
  62 #define  COM2_SSLEEP      0x10  /* Soft sleep mode */
  63 #define REG_PID         0x0a    /* Product ID MSB */
  64 #define REG_VER         0x0b    /* Product ID LSB */
  65 #define REG_COM3        0x0c    /* Control 3 */
  66 #define  COM3_SWAP        0x40    /* Byte swap */
  67 #define  COM3_SCALEEN     0x08    /* Enable scaling */
  68 #define  COM3_DCWEN       0x04    /* Enable downsamp/crop/window */
  69 #define REG_COM4        0x0d    /* Control 4 */
  70 #define REG_COM5        0x0e    /* All "reserved" */
  71 #define REG_COM6        0x0f    /* Control 6 */
  72 #define REG_AECH        0x10    /* More bits of AEC value */
  73 #define REG_CLKRC       0x11    /* Clocl control */
  74 #define   CLK_EXT         0x40    /* Use external clock directly */
  75 #define   CLK_SCALE       0x3f    /* Mask for internal clock scale */
  76 #define REG_COM7        0x12    /* Control 7 */
  77 #define   COM7_RESET      0x80    /* Register reset */
  78 #define   COM7_FMT_MASK   0x38
  79 #define   COM7_FMT_VGA    0x00
  80 #define   COM7_FMT_CIF    0x20    /* CIF format */
  81 #define   COM7_FMT_QVGA   0x10    /* QVGA format */
  82 #define   COM7_FMT_QCIF   0x08    /* QCIF format */
  83 #define   COM7_RGB        0x04    /* bits 0 and 2 - RGB format */
  84 #define   COM7_YUV        0x00    /* YUV */
  85 #define   COM7_BAYER      0x01    /* Bayer format */
  86 #define   COM7_PBAYER     0x05    /* "Processed bayer" */
  87 #define REG_COM8        0x13    /* Control 8 */
  88 #define   COM8_FASTAEC    0x80    /* Enable fast AGC/AEC */
  89 #define   COM8_AECSTEP    0x40    /* Unlimited AEC step size */
  90 #define   COM8_BFILT      0x20    /* Band filter enable */
  91 #define   COM8_AGC        0x04    /* Auto gain enable */
  92 #define   COM8_AWB        0x02    /* White balance enable */
  93 #define   COM8_AEC        0x01    /* Auto exposure enable */
  94 #define REG_COM9        0x14    /* Control 9  - gain ceiling */
  95 #define REG_COM10       0x15    /* Control 10 */
  96 #define   COM10_HSYNC     0x40    /* HSYNC instead of HREF */
  97 #define   COM10_PCLK_HB   0x20    /* Suppress PCLK on horiz blank */
  98 #define   COM10_HREF_REV  0x08    /* Reverse HREF */
  99 #define   COM10_VS_LEAD   0x04    /* VSYNC on clock leading edge */
 100 #define   COM10_VS_NEG    0x02    /* VSYNC negative */
 101 #define   COM10_HS_NEG    0x01    /* HSYNC negative */
 102 #define REG_HSTART      0x17    /* Horiz start high bits */
 103 #define REG_HSTOP       0x18    /* Horiz stop high bits */
 104 #define REG_VSTART      0x19    /* Vert start high bits */
 105 #define REG_VSTOP       0x1a    /* Vert stop high bits */
 106 #define REG_PSHFT       0x1b    /* Pixel delay after HREF */
 107 #define REG_MIDH        0x1c    /* Manuf. ID high */
 108 #define REG_MIDL        0x1d    /* Manuf. ID low */
 109 #define REG_MVFP        0x1e    /* Mirror / vflip */
 110 #define   MVFP_MIRROR     0x20    /* Mirror image */
 111 #define   MVFP_FLIP       0x10    /* Vertical flip */
 112
 113 #define REG_AEW         0x24    /* AGC upper limit */
 114 #define REG_AEB         0x25    /* AGC lower limit */
 115 #define REG_VPT         0x26    /* AGC/AEC fast mode op region */
 116 #define REG_HSYST       0x30    /* HSYNC rising edge delay */
 117 #define REG_HSYEN       0x31    /* HSYNC falling edge delay */
 118 #define REG_HREF        0x32    /* HREF pieces */
 119 #define REG_TSLB        0x3a    /* lots of stuff */
 120 #define   TSLB_YLAST      0x04    /* UYVY or VYUY - see com13 */
 121 #define REG_COM11       0x3b    /* Control 11 */
 122 #define   COM11_NIGHT     0x80    /* NIght mode enable */
 123 #define   COM11_NMFR      0x60    /* Two bit NM frame rate */
 124 #define   COM11_HZAUTO    0x10    /* Auto detect 50/60 Hz */
 125 #define   COM11_50HZ      0x08    /* Manual 50Hz select */
 126 #define   COM11_EXP       0x02
 127 #define REG_COM12       0x3c    /* Control 12 */
 128 #define   COM12_HREF      0x80    /* HREF always */
 129 #define REG_COM13       0x3d    /* Control 13 */
 130 #define   COM13_GAMMA     0x80    /* Gamma enable */
 131 #define   COM13_UVSAT     0x40    /* UV saturation auto adjustment */
 132 #define   COM13_UVSWAP    0x01    /* V before U - w/TSLB */
 133 #define REG_COM14       0x3e    /* Control 14 */
 134 #define   COM14_DCWEN     0x10    /* DCW/PCLK-scale enable */
 135 #define REG_EDGE        0x3f    /* Edge enhancement factor */
 136 #define REG_COM15       0x40    /* Control 15 */
 137 #define   COM15_R10F0     0x00    /* Data range 10 to F0 */
 138 #define   COM15_R01FE     0x80    /*            01 to FE */
 139 #define   COM15_R00FF     0xc0    /*            00 to FF */
 140 #define   COM15_RGB565    0x10    /* RGB565 output */
 141 #define   COM15_RGB555    0x30    /* RGB555 output */
 142 #define REG_COM16       0x41    /* Control 16 */
 143 #define   COM16_AWBGAIN   0x08    /* AWB gain enable */
 144 #define REG_COM17       0x42    /* Control 17 */
 145 #define   COM17_AECWIN    0xc0    /* AEC window - must match COM4 */
 146 #define   COM17_CBAR      0x08    /* DSP Color bar */
 147
 148 /*
 149  * This matrix defines how the colors are generated, must be
 150  * tweaked to adjust hue and saturation.
 151  *
 152  * Order: v-red, v-green, v-blue, u-red, u-green, u-blue
 153  *
 154  * They are nine-bit signed quantities, with the sign bit
 155  * stored in 0x58.  Sign for v-red is bit 0, and up from there.
 156  */
 157 #define REG_CMATRIX_BASE 0x4f
 158 #define   CMATRIX_LEN 6
 159 #define REG_CMATRIX_SIGN 0x58
 160
 161
 162 #define REG_BRIGHT      0x55    /* Brightness */
 163 #define REG_CONTRAS     0x56    /* Contrast control */
 164
 165 #define REG_GFIX        0x69    /* Fix gain control */
 166
 167 #define REG_REG76       0x76    /* OV's name */
 168 #define   R76_BLKPCOR     0x80    /* Black pixel correction enable */
 169 #define   R76_WHTPCOR     0x40    /* White pixel correction enable */
 170
 171 #define REG_RGB444      0x8c    /* RGB 444 control */
 172 #define   R444_ENABLE     0x02    /* Turn on RGB444, overrides 5x5 */
 173 #define   R444_RGBX       0x01    /* Empty nibble at end */
 174
 175 #define REG_HAECC1      0x9f    /* Hist AEC/AGC control 1 */
 176 #define REG_HAECC2      0xa0    /* Hist AEC/AGC control 2 */
 177
 178 #define REG_BD50MAX     0xa5    /* 50hz banding step limit */
 179 #define REG_HAECC3      0xa6    /* Hist AEC/AGC control 3 */
 180 #define REG_HAECC4      0xa7    /* Hist AEC/AGC control 4 */
 181 #define REG_HAECC5      0xa8    /* Hist AEC/AGC control 5 */
 182 #define REG_HAECC6      0xa9    /* Hist AEC/AGC control 6 */
 183 #define REG_HAECC7      0xaa    /* Hist AEC/AGC control 7 */
 184 #define REG_BD60MAX     0xab    /* 60hz banding step limit */
 185
 186
 187 /*
 188  * Information we maintain about a known sensor.
 189  */
 190 struct ov7670_format_struct;  /* coming later */
 191 struct ov7670_info {
 192         struct ov7670_format_struct *fmt;  /* Current format */
 193         unsigned char sat;              /* Saturation value */
 194         int hue;                        /* Hue value */
 195 };
 196
 197
 198
 199
 200 /*
 201  * The default register settings, as obtained from OmniVision.  There
 202  * is really no making sense of most of these - lots of "reserved" values
 203  * and such.
 204  *
 205  * These settings give VGA YUYV.
 206  */
 207
 208 struct regval_list {
 209         unsigned char reg_num;
 210         unsigned char value;
 211 };
 212
 213 static struct regval_list ov7670_default_regs[] = {
 214         { REG_COM7, COM7_RESET },
 215 /*
 216  * Clock scale: 3 = 15fps
 217  *              2 = 20fps
 218  *              1 = 30fps
 219  */
 220         { REG_CLKRC, 0x1 },     /* OV: clock scale (30 fps) */
 221         { REG_TSLB,  0x04 },    /* OV */
 222         { REG_COM7, 0 },        /* VGA */
 223         /*
 224          * Set the hardware window.  These values from OV don't entirely
 225          * make sense - hstop is less than hstart.  But they work...
 226          */
 227         { REG_HSTART, 0x13 },   { REG_HSTOP, 0x01 },
 228         { REG_HREF, 0xb6 },     { REG_VSTART, 0x02 },
 229         { REG_VSTOP, 0x7a },    { REG_VREF, 0x0a },
 230
 231         { REG_COM3, 0 },        { REG_COM14, 0 },
 232         /* Mystery scaling numbers */
 233         { 0x70, 0x3a },         { 0x71, 0x35 },
 234         { 0x72, 0x11 },         { 0x73, 0xf0 },
 235         { 0xa2, 0x02 },         { REG_COM10, 0x0 },
 236
 237         /* Gamma curve values */
 238         { 0x7a, 0x20 },         { 0x7b, 0x10 },
 239         { 0x7c, 0x1e },         { 0x7d, 0x35 },
 240         { 0x7e, 0x5a },         { 0x7f, 0x69 },
 241         { 0x80, 0x76 },         { 0x81, 0x80 },
 242         { 0x82, 0x88 },         { 0x83, 0x8f },
 243         { 0x84, 0x96 },         { 0x85, 0xa3 },
 244         { 0x86, 0xaf },         { 0x87, 0xc4 },
 245         { 0x88, 0xd7 },         { 0x89, 0xe8 },
 246
 247         /* AGC and AEC parameters.  Note we start by disabling those features,
 248            then turn them only after tweaking the values. */
 249         { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
 250         { REG_GAIN, 0 },        { REG_AECH, 0 },
 251         { REG_COM4, 0x40 }, /* magic reserved bit */
 252         { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
 253         { REG_BD50MAX, 0x05 },  { REG_BD60MAX, 0x07 },
 254         { REG_AEW, 0x95 },      { REG_AEB, 0x33 },
 255         { REG_VPT, 0xe3 },      { REG_HAECC1, 0x78 },
 256         { REG_HAECC2, 0x68 },   { 0xa1, 0x03 }, /* magic */
 257         { REG_HAECC3, 0xd8 },   { REG_HAECC4, 0xd8 },
 258         { REG_HAECC5, 0xf0 },   { REG_HAECC6, 0x90 },
 259         { REG_HAECC7, 0x94 },
 260         { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
 261
 262         /* Almost all of these are magic "reserved" values.  */
 263         { REG_COM5, 0x61 },     { REG_COM6, 0x4b },
 264         { 0x16, 0x02 },         { REG_MVFP, 0x07 },
 265         { 0x21, 0x02 },         { 0x22, 0x91 },
 266         { 0x29, 0x07 },         { 0x33, 0x0b },
 267         { 0x35, 0x0b },         { 0x37, 0x1d },
 268         { 0x38, 0x71 },         { 0x39, 0x2a },
 269         { REG_COM12, 0x78 },    { 0x4d, 0x40 },
 270         { 0x4e, 0x20 },         { REG_GFIX, 0 },
 271         { 0x6b, 0x4a },         { 0x74, 0x10 },
 272         { 0x8d, 0x4f },         { 0x8e, 0 },
 273         { 0x8f, 0 },            { 0x90, 0 },
 274         { 0x91, 0 },            { 0x96, 0 },
 275         { 0x9a, 0 },            { 0xb0, 0x84 },
 276         { 0xb1, 0x0c },         { 0xb2, 0x0e },
 277         { 0xb3, 0x82 },         { 0xb8, 0x0a },
 278
 279         /* More reserved magic, some of which tweaks white balance */
 280         { 0x43, 0x0a },         { 0x44, 0xf0 },
 281         { 0x45, 0x34 },         { 0x46, 0x58 },
 282         { 0x47, 0x28 },         { 0x48, 0x3a },
 283         { 0x59, 0x88 },         { 0x5a, 0x88 },
 284         { 0x5b, 0x44 },         { 0x5c, 0x67 },
 285         { 0x5d, 0x49 },         { 0x5e, 0x0e },
 286         { 0x6c, 0x0a },         { 0x6d, 0x55 },
 287         { 0x6e, 0x11 },         { 0x6f, 0x9f }, /* "9e for advance AWB" */
 288         { 0x6a, 0x40 },         { REG_BLUE, 0x40 },
 289         { REG_RED, 0x60 },
 290         { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
 291
 292         /* Matrix coefficients */
 293         { 0x4f, 0x80 },         { 0x50, 0x80 },
 294         { 0x51, 0 },            { 0x52, 0x22 },
 295         { 0x53, 0x5e },         { 0x54, 0x80 },
 296         { 0x58, 0x9e },
 297
 298         { REG_COM16, COM16_AWBGAIN },   { REG_EDGE, 0 },
 299         { 0x75, 0x05 },         { 0x76, 0xe1 },
 300         { 0x4c, 0 },            { 0x77, 0x01 },
 301         { REG_COM13, 0xc3 },    { 0x4b, 0x09 },
 302         { 0xc9, 0x60 },         { REG_COM16, 0x38 },
 303         { 0x56, 0x40 },
 304
 305         { 0x34, 0x11 },         { REG_COM11, COM11_EXP|COM11_HZAUTO },
 306         { 0xa4, 0x88 },         { 0x96, 0 },
 307         { 0x97, 0x30 },         { 0x98, 0x20 },
 308         { 0x99, 0x30 },         { 0x9a, 0x84 },
 309         { 0x9b, 0x29 },         { 0x9c, 0x03 },
 310         { 0x9d, 0x4c },         { 0x9e, 0x3f },
 311         { 0x78, 0x04 },
 312
 313         /* Extra-weird stuff.  Some sort of multiplexor register */
 314         { 0x79, 0x01 },         { 0xc8, 0xf0 },
 315         { 0x79, 0x0f },         { 0xc8, 0x00 },
 316         { 0x79, 0x10 },         { 0xc8, 0x7e },
 317         { 0x79, 0x0a },         { 0xc8, 0x80 },
 318         { 0x79, 0x0b },         { 0xc8, 0x01 },
 319         { 0x79, 0x0c },         { 0xc8, 0x0f },
 320         { 0x79, 0x0d },         { 0xc8, 0x20 },
 321         { 0x79, 0x09 },         { 0xc8, 0x80 },
 322         { 0x79, 0x02 },         { 0xc8, 0xc0 },
 323         { 0x79, 0x03 },         { 0xc8, 0x40 },
 324         { 0x79, 0x05 },         { 0xc8, 0x30 },
 325         { 0x79, 0x26 },
 326
 327         { 0xff, 0xff }, /* END MARKER */
 328 };
 329
 330
 331 /*
 332  * Here we'll try to encapsulate the changes for just the output
 333  * video format.
 334  *
 335  * RGB656 and YUV422 come from OV; RGB444 is homebrewed.
 336  *
 337  * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why.
 338  */
 339
 340
 341 static struct regval_list ov7670_fmt_yuv422[] = {
 342         { REG_COM7, 0x0 },  /* Selects YUV mode */
 343         { REG_RGB444, 0 },      /* No RGB444 please */
 344         { REG_COM1, 0 },
 345         { REG_COM15, COM15_R00FF },
 346         { REG_COM9, 0x18 }, /* 4x gain ceiling; 0x8 is reserved bit */
 347         { 0x4f, 0x80 },         /* "matrix coefficient 1" */
 348         { 0x50, 0x80 },         /* "matrix coefficient 2" */
 349         { 0x51, 0    },         /* vb */
 350         { 0x52, 0x22 },         /* "matrix coefficient 4" */
 351         { 0x53, 0x5e },         /* "matrix coefficient 5" */
 352         { 0x54, 0x80 },         /* "matrix coefficient 6" */
 353         { REG_COM13, COM13_GAMMA|COM13_UVSAT },
 354         { 0xff, 0xff },
 355 };
 356
 357 static struct regval_list ov7670_fmt_rgb565[] = {
 358         { REG_COM7, COM7_RGB }, /* Selects RGB mode */
 359         { REG_RGB444, 0 },      /* No RGB444 please */
 360         { REG_COM1, 0x0 },
 361         { REG_COM15, COM15_RGB565 },
 362         { REG_COM9, 0x38 },     /* 16x gain ceiling; 0x8 is reserved bit */
 363         { 0x4f, 0xb3 },         /* "matrix coefficient 1" */
 364         { 0x50, 0xb3 },         /* "matrix coefficient 2" */
 365         { 0x51, 0    },         /* vb */
 366         { 0x52, 0x3d },         /* "matrix coefficient 4" */
 367         { 0x53, 0xa7 },         /* "matrix coefficient 5" */
 368         { 0x54, 0xe4 },         /* "matrix coefficient 6" */
 369         { REG_COM13, COM13_GAMMA|COM13_UVSAT },
 370         { 0xff, 0xff },
 371 };
 372
 373 static struct regval_list ov7670_fmt_rgb444[] = {
 374         { REG_COM7, COM7_RGB }, /* Selects RGB mode */
 375         { REG_RGB444, R444_ENABLE },    /* Enable xxxxrrrr ggggbbbb */
 376         { REG_COM1, 0x40 },     /* Magic reserved bit */
 377         { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */
 378         { REG_COM9, 0x38 },     /* 16x gain ceiling; 0x8 is reserved bit */
 379         { 0x4f, 0xb3 },         /* "matrix coefficient 1" */
 380         { 0x50, 0xb3 },         /* "matrix coefficient 2" */
 381         { 0x51, 0    },         /* vb */
 382         { 0x52, 0x3d },         /* "matrix coefficient 4" */
 383         { 0x53, 0xa7 },         /* "matrix coefficient 5" */
 384         { 0x54, 0xe4 },         /* "matrix coefficient 6" */
 385         { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 },  /* Magic rsvd bit */
 386         { 0xff, 0xff },
 387 };
 388
 389 static struct regval_list ov7670_fmt_raw[] = {
 390         { REG_COM7, COM7_BAYER },
 391         { REG_COM13, 0x08 }, /* No gamma, magic rsvd bit */
 392         { REG_COM16, 0x3d }, /* Edge enhancement, denoise */
 393         { REG_REG76, 0xe1 }, /* Pix correction, magic rsvd */
 394         { 0xff, 0xff },
 395 };
 396
 397
 398
 399 /*
 400  * Low-level register I/O.
 401  */
 402
 403 static int ov7670_read(struct i2c_client *c, unsigned char reg,
 404                 unsigned char *value)
 405 {
 406         int ret;
 407
 408         ret = i2c_smbus_read_byte_data(c, reg);
 409         if (ret >= 0) {
 410                 *value = (unsigned char) ret;
 411                 ret = 0;
 412         }
 413         return ret;
 414 }
 415
 416
 417 static int ov7670_write(struct i2c_client *c, unsigned char reg,
 418                 unsigned char value)
 419 {
 420         int ret = i2c_smbus_write_byte_data(c, reg, value);
 421         if (reg == REG_COM7 && (value & COM7_RESET))
 422                 msleep(2);  /* Wait for reset to run */
 423         return ret;
 424 }
 425
 426
 427 /*
 428  * Write a list of register settings; ff/ff stops the process.
 429  */
 430 static int ov7670_write_array(struct i2c_client *c, struct regval_list *vals)
 431 {
 432         while (vals->reg_num != 0xff || vals->value != 0xff) {
 433                 int ret = ov7670_write(c, vals->reg_num, vals->value);
 434                 if (ret < 0)
 435                         return ret;
 436                 vals++;
 437         }
 438         return 0;
 439 }
 440
 441
 442 /*
 443  * Stuff that knows about the sensor.
 444  */
 445 static void ov7670_reset(struct i2c_client *client)
 446 {
 447         ov7670_write(client, REG_COM7, COM7_RESET);
 448         msleep(1);
 449 }
 450
 451
 452 static int ov7670_init(struct i2c_client *client)
 453 {
 454         return ov7670_write_array(client, ov7670_default_regs);
 455 }
 456
 457
 458
 459 static int ov7670_detect(struct i2c_client *client)
 460 {
 461         unsigned char v;
 462         int ret;
 463
 464         ret = ov7670_init(client);
 465         if (ret < 0)
 466                 return ret;
 467         ret = ov7670_read(client, REG_MIDH, &v);
 468         if (ret < 0)
 469                 return ret;
 470         if (v != 0x7f) /* OV manuf. id. */
 471                 return -ENODEV;
 472         ret = ov7670_read(client, REG_MIDL, &v);
 473         if (ret < 0)
 474                 return ret;
 475         if (v != 0xa2)
 476                 return -ENODEV;
 477         /*
 478          * OK, we know we have an OmniVision chip...but which one?
 479          */
 480         ret = ov7670_read(client, REG_PID, &v);
 481         if (ret < 0)
 482                 return ret;
 483         if (v != 0x76)  /* PID + VER = 0x76 / 0x73 */
 484                 return -ENODEV;
 485         ret = ov7670_read(client, REG_VER, &v);
 486         if (ret < 0)
 487                 return ret;
 488         if (v != 0x73)  /* PID + VER = 0x76 / 0x73 */
 489                 return -ENODEV;
 490         return 0;
 491 }
 492
 493
 494 /*
 495  * Store information about the video data format.  The color matrix
 496  * is deeply tied into the format, so keep the relevant values here.
 497  * The magic matrix nubmers come from OmniVision.
 498  */
 499 static struct ov7670_format_struct {
 500         __u8 *desc;
 501         __u32 pixelformat;
 502         struct regval_list *regs;
 503         int cmatrix[CMATRIX_LEN];
 504         int bpp;   /* Bytes per pixel */
 505 } ov7670_formats[] = {
 506         {
 507                 .desc           = "YUYV 4:2:2",
 508                 .pixelformat    = V4L2_PIX_FMT_YUYV,
 509                 .regs           = ov7670_fmt_yuv422,
 510                 .cmatrix        = { 128, -128, 0, -34, -94, 128 },
 511                 .bpp            = 2,
 512         },
 513         {
 514                 .desc           = "RGB 444",
 515                 .pixelformat    = V4L2_PIX_FMT_RGB444,
 516                 .regs           = ov7670_fmt_rgb444,
 517                 .cmatrix        = { 179, -179, 0, -61, -176, 228 },
 518                 .bpp            = 2,
 519         },
 520         {
 521                 .desc           = "RGB 565",
 522                 .pixelformat    = V4L2_PIX_FMT_RGB565,
 523                 .regs           = ov7670_fmt_rgb565,
 524                 .cmatrix        = { 179, -179, 0, -61, -176, 228 },
 525                 .bpp            = 2,
 526         },
 527         {
 528                 .desc           = "Raw RGB Bayer",
 529                 .pixelformat    = V4L2_PIX_FMT_SBGGR8,
 530                 .regs           = ov7670_fmt_raw,
 531                 .cmatrix        = { 0, 0, 0, 0, 0, 0 },
 532                 .bpp            = 1
 533         },
 534 };
 535 #define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats)
 536
 537
 538 /*
 539  * Then there is the issue of window sizes.  Try to capture the info here.
 540  */
 541
 542 /*
 543  * QCIF mode is done (by OV) in a very strange way - it actually looks like
 544  * VGA with weird scaling options - they do *not* use the canned QCIF mode
 545  * which is allegedly provided by the sensor.  So here's the weird register
 546  * settings.
 547  */
 548 static struct regval_list ov7670_qcif_regs[] = {
 549         { REG_COM3, COM3_SCALEEN|COM3_DCWEN },
 550         { REG_COM3, COM3_DCWEN },
 551         { REG_COM14, COM14_DCWEN | 0x01},
 552         { 0x73, 0xf1 },
 553         { 0xa2, 0x52 },
 554         { 0x7b, 0x1c },
 555         { 0x7c, 0x28 },
 556         { 0x7d, 0x3c },
 557         { 0x7f, 0x69 },
 558         { REG_COM9, 0x38 },
 559         { 0xa1, 0x0b },
 560         { 0x74, 0x19 },
 561         { 0x9a, 0x80 },
 562         { 0x43, 0x14 },
 563         { REG_COM13, 0xc0 },
 564         { 0xff, 0xff },
 565 };
 566
 567 static struct ov7670_win_size {
 568         int     width;
 569         int     height;
 570         unsigned char com7_bit;
 571         int     hstart;         /* Start/stop values for the camera.  Note */
 572         int     hstop;          /* that they do not always make complete */
 573         int     vstart;         /* sense to humans, but evidently the sensor */
 574         int     vstop;          /* will do the right thing... */
 575         struct regval_list *regs; /* Regs to tweak */
 576 /* h/vref stuff */
 577 } ov7670_win_sizes[] = {
 578         /* VGA */
 579         {
 580                 .width          = VGA_WIDTH,
 581                 .height         = VGA_HEIGHT,
 582                 .com7_bit       = COM7_FMT_VGA,
 583                 .hstart         = 158,          /* These values from */
 584                 .hstop          =  14,          /* Omnivision */
 585                 .vstart         =  10,
 586                 .vstop          = 490,
 587                 .regs           = NULL,
 588         },
 589         /* CIF */
 590         {
 591                 .width          = CIF_WIDTH,
 592                 .height         = CIF_HEIGHT,
 593                 .com7_bit       = COM7_FMT_CIF,
 594                 .hstart         = 170,          /* Empirically determined */
 595                 .hstop          =  90,
 596                 .vstart         =  14,
 597                 .vstop          = 494,
 598                 .regs           = NULL,
 599         },
 600         /* QVGA */
 601         {
 602                 .width          = QVGA_WIDTH,
 603                 .height         = QVGA_HEIGHT,
 604                 .com7_bit       = COM7_FMT_QVGA,
 605                 .hstart         = 164,          /* Empirically determined */
 606                 .hstop          =  20,
 607                 .vstart         =  14,
 608                 .vstop          = 494,
 609                 .regs           = NULL,
 610         },
 611         /* QCIF */
 612         {
 613                 .width          = QCIF_WIDTH,
 614                 .height         = QCIF_HEIGHT,
 615                 .com7_bit       = COM7_FMT_VGA, /* see comment above */
 616                 .hstart         = 456,          /* Empirically determined */
 617                 .hstop          =  24,
 618                 .vstart         =  14,
 619                 .vstop          = 494,
 620                 .regs           = ov7670_qcif_regs,
 621         },
 622 };
 623
 624 #define N_WIN_SIZES (ARRAY_SIZE(ov7670_win_sizes))
 625
 626
 627 /*
 628  * Store a set of start/stop values into the camera.
 629  */
 630 static int ov7670_set_hw(struct i2c_client *client, int hstart, int hstop,
 631                 int vstart, int vstop)
 632 {
 633         int ret;
 634         unsigned char v;
 635 /*
 636  * Horizontal: 11 bits, top 8 live in hstart and hstop.  Bottom 3 of
 637  * hstart are in href[2:0], bottom 3 of hstop in href[5:3].  There is
 638  * a mystery "edge offset" value in the top two bits of href.
 639  */
 640         ret =  ov7670_write(client, REG_HSTART, (hstart >> 3) & 0xff);
 641         ret += ov7670_write(client, REG_HSTOP, (hstop >> 3) & 0xff);
 642         ret += ov7670_read(client, REG_HREF, &v);
 643         v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
 644         msleep(10);
 645         ret += ov7670_write(client, REG_HREF, v);
 646 /*
 647  * Vertical: similar arrangement, but only 10 bits.
 648  */
 649         ret += ov7670_write(client, REG_VSTART, (vstart >> 2) & 0xff);
 650         ret += ov7670_write(client, REG_VSTOP, (vstop >> 2) & 0xff);
 651         ret += ov7670_read(client, REG_VREF, &v);
 652         v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
 653         msleep(10);
 654         ret += ov7670_write(client, REG_VREF, v);
 655         return ret;
 656 }
 657
 658
 659 static int ov7670_enum_fmt(struct i2c_client *c, struct v4l2_fmtdesc *fmt)
 660 {
 661         struct ov7670_format_struct *ofmt;
 662
 663         if (fmt->index >= N_OV7670_FMTS)
 664                 return -EINVAL;
 665
 666         ofmt = ov7670_formats + fmt->index;
 667         fmt->flags = 0;
 668         strcpy(fmt->description, ofmt->desc);
 669         fmt->pixelformat = ofmt->pixelformat;
 670         return 0;
 671 }
 672
 673
 674 static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt,
 675                 struct ov7670_format_struct **ret_fmt,
 676                 struct ov7670_win_size **ret_wsize)
 677 {
 678         int index;
 679         struct ov7670_win_size *wsize;
 680         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 681
 682         for (index = 0; index < N_OV7670_FMTS; index++)
 683                 if (ov7670_formats[index].pixelformat == pix->pixelformat)
 684                         break;
 685         if (index >= N_OV7670_FMTS) {
 686                 /* default to first format */
 687                 index = 0;
 688                 pix->pixelformat = ov7670_formats[0].pixelformat;
 689         }
 690         if (ret_fmt != NULL)
 691                 *ret_fmt = ov7670_formats + index;
 692         /*
 693          * Fields: the OV devices claim to be progressive.
 694          */
 695         pix->field = V4L2_FIELD_NONE;
 696         /*
 697          * Round requested image size down to the nearest
 698          * we support, but not below the smallest.
 699          */
 700         for (wsize = ov7670_win_sizes; wsize < ov7670_win_sizes + N_WIN_SIZES;
 701              wsize++)
 702                 if (pix->width >= wsize->width && pix->height >= wsize->height)
 703                         break;
 704         if (wsize >= ov7670_win_sizes + N_WIN_SIZES)
 705                 wsize--;   /* Take the smallest one */
 706         if (ret_wsize != NULL)
 707                 *ret_wsize = wsize;
 708         /*
 709          * Note the size we'll actually handle.
 710          */
 711         pix->width = wsize->width;
 712         pix->height = wsize->height;
 713         pix->bytesperline = pix->width*ov7670_formats[index].bpp;
 714         pix->sizeimage = pix->height*pix->bytesperline;
 715         return 0;
 716 }
 717
 718 /*
 719  * Set a format.
 720  */
 721 static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt)
 722 {
 723         int ret;
 724         struct ov7670_format_struct *ovfmt;
 725         struct ov7670_win_size *wsize;
 726         struct ov7670_info *info = i2c_get_clientdata(c);
 727         unsigned char com7, clkrc;
 728
 729         ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize);
 730         if (ret)
 731                 return ret;
 732         /*
 733          * HACK: if we're running rgb565 we need to grab then rewrite
 734          * CLKRC.  If we're *not*, however, then rewriting clkrc hoses
 735          * the colors.
 736          */
 737         if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565) {
 738                 ret = ov7670_read(c, REG_CLKRC, &clkrc);
 739                 if (ret)
 740                         return ret;
 741         }
 742         /*
 743          * COM7 is a pain in the ass, it doesn't like to be read then
 744          * quickly written afterward.  But we have everything we need
 745          * to set it absolutely here, as long as the format-specific
 746          * register sets list it first.
 747          */
 748         com7 = ovfmt->regs[0].value;
 749         com7 |= wsize->com7_bit;
 750         ov7670_write(c, REG_COM7, com7);
 751         /*
 752          * Now write the rest of the array.  Also store start/stops
 753          */
 754         ov7670_write_array(c, ovfmt->regs + 1);
 755         ov7670_set_hw(c, wsize->hstart, wsize->hstop, wsize->vstart,
 756                         wsize->vstop);
 757         ret = 0;
 758         if (wsize->regs)
 759                 ret = ov7670_write_array(c, wsize->regs);
 760         info->fmt = ovfmt;
 761
 762         if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565 && ret == 0)
 763                 ret = ov7670_write(c, REG_CLKRC, clkrc);
 764         return ret;
 765 }
 766
 767 /*
 768  * Implement G/S_PARM.  There is a "high quality" mode we could try
 769  * to do someday; for now, we just do the frame rate tweak.
 770  */
 771 static int ov7670_g_parm(struct i2c_client *c, struct v4l2_streamparm *parms)
 772 {
 773         struct v4l2_captureparm *cp = &parms->parm.capture;
 774         unsigned char clkrc;
 775         int ret;
 776
 777         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 778                 return -EINVAL;
 779         ret = ov7670_read(c, REG_CLKRC, &clkrc);
 780         if (ret < 0)
 781                 return ret;
 782         memset(cp, 0, sizeof(struct v4l2_captureparm));
 783         cp->capability = V4L2_CAP_TIMEPERFRAME;
 784         cp->timeperframe.numerator = 1;
 785         cp->timeperframe.denominator = OV7670_FRAME_RATE;
 786         if ((clkrc & CLK_EXT) == 0 && (clkrc & CLK_SCALE) > 1)
 787                 cp->timeperframe.denominator /= (clkrc & CLK_SCALE);
 788         return 0;
 789 }
 790
 791 static int ov7670_s_parm(struct i2c_client *c, struct v4l2_streamparm *parms)
 792 {
 793         struct v4l2_captureparm *cp = &parms->parm.capture;
 794         struct v4l2_fract *tpf = &cp->timeperframe;
 795         unsigned char clkrc;
 796         int ret, div;
 797
 798         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 799                 return -EINVAL;
 800         if (cp->extendedmode != 0)
 801                 return -EINVAL;
 802         /*
 803          * CLKRC has a reserved bit, so let's preserve it.
 804          */
 805         ret = ov7670_read(c, REG_CLKRC, &clkrc);
 806         if (ret < 0)
 807                 return ret;
 808         if (tpf->numerator == 0 || tpf->denominator == 0)
 809                 div = 1;  /* Reset to full rate */
 810         else
 811                 div = (tpf->numerator*OV7670_FRAME_RATE)/tpf->denominator;
 812         if (div == 0)
 813                 div = 1;
 814         else if (div > CLK_SCALE)
 815                 div = CLK_SCALE;
 816         clkrc = (clkrc & 0x80) | div;
 817         tpf->numerator = 1;
 818         tpf->denominator = OV7670_FRAME_RATE/div;
 819         return ov7670_write(c, REG_CLKRC, clkrc);
 820 }
 821
 822
 823
 824 /*
 825  * Code for dealing with controls.
 826  */
 827
 828
 829
 830
 831
 832 static int ov7670_store_cmatrix(struct i2c_client *client,
 833                 int matrix[CMATRIX_LEN])
 834 {
 835         int i, ret;
 836         unsigned char signbits = 0;
 837
 838         /*
 839          * Weird crap seems to exist in the upper part of
 840          * the sign bits register, so let's preserve it.
 841          */
 842         ret = ov7670_read(client, REG_CMATRIX_SIGN, &signbits);
 843         signbits &= 0xc0;
 844
 845         for (i = 0; i < CMATRIX_LEN; i++) {
 846                 unsigned char raw;
 847
 848                 if (matrix[i] < 0) {
 849                         signbits |= (1 << i);
 850                         if (matrix[i] < -255)
 851                                 raw = 0xff;
 852                         else
 853                                 raw = (-1 * matrix[i]) & 0xff;
 854                 }
 855                 else {
 856                         if (matrix[i] > 255)
 857                                 raw = 0xff;
 858                         else
 859                                 raw = matrix[i] & 0xff;
 860                 }
 861                 ret += ov7670_write(client, REG_CMATRIX_BASE + i, raw);
 862         }
 863         ret += ov7670_write(client, REG_CMATRIX_SIGN, signbits);
 864         return ret;
 865 }
 866
 867
 868 /*
 869  * Hue also requires messing with the color matrix.  It also requires
 870  * trig functions, which tend not to be well supported in the kernel.
 871  * So here is a simple table of sine values, 0-90 degrees, in steps
 872  * of five degrees.  Values are multiplied by 1000.
 873  *
 874  * The following naive approximate trig functions require an argument
 875  * carefully limited to -180 <= theta <= 180.
 876  */
 877 #define SIN_STEP 5
 878 static const int ov7670_sin_table[] = {
 879            0,    87,   173,   258,   342,   422,
 880          499,   573,   642,   707,   766,   819,
 881          866,   906,   939,   965,   984,   996,
 882         1000
 883 };
 884
 885 static int ov7670_sine(int theta)
 886 {
 887         int chs = 1;
 888         int sine;
 889
 890         if (theta < 0) {
 891                 theta = -theta;
 892                 chs = -1;
 893         }
 894         if (theta <= 90)
 895                 sine = ov7670_sin_table[theta/SIN_STEP];
 896         else {
 897                 theta -= 90;
 898                 sine = 1000 - ov7670_sin_table[theta/SIN_STEP];
 899         }
 900         return sine*chs;
 901 }
 902
 903 static int ov7670_cosine(int theta)
 904 {
 905         theta = 90 - theta;
 906         if (theta > 180)
 907                 theta -= 360;
 908         else if (theta < -180)
 909                 theta += 360;
 910         return ov7670_sine(theta);
 911 }
 912
 913
 914
 915
 916 static void ov7670_calc_cmatrix(struct ov7670_info *info,
 917                 int matrix[CMATRIX_LEN])
 918 {
 919         int i;
 920         /*
 921          * Apply the current saturation setting first.
 922          */
 923         for (i = 0; i < CMATRIX_LEN; i++)
 924                 matrix[i] = (info->fmt->cmatrix[i]*info->sat) >> 7;
 925         /*
 926          * Then, if need be, rotate the hue value.
 927          */
 928         if (info->hue != 0) {
 929                 int sinth, costh, tmpmatrix[CMATRIX_LEN];
 930
 931                 memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
 932                 sinth = ov7670_sine(info->hue);
 933                 costh = ov7670_cosine(info->hue);
 934
 935                 matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000;
 936                 matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000;
 937                 matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000;
 938                 matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000;
 939                 matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000;
 940                 matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000;
 941         }
 942 }
 943
 944
 945
 946 static int ov7670_t_sat(struct i2c_client *client, int value)
 947 {
 948         struct ov7670_info *info = i2c_get_clientdata(client);
 949         int matrix[CMATRIX_LEN];
 950         int ret;
 951
 952         info->sat = value;
 953         ov7670_calc_cmatrix(info, matrix);
 954         ret = ov7670_store_cmatrix(client, matrix);
 955         return ret;
 956 }
 957
 958 static int ov7670_q_sat(struct i2c_client *client, __s32 *value)
 959 {
 960         struct ov7670_info *info = i2c_get_clientdata(client);
 961
 962         *value = info->sat;
 963         return 0;
 964 }
 965
 966 static int ov7670_t_hue(struct i2c_client *client, int value)
 967 {
 968         struct ov7670_info *info = i2c_get_clientdata(client);
 969         int matrix[CMATRIX_LEN];
 970         int ret;
 971
 972         if (value < -180 || value > 180)
 973                 return -EINVAL;
 974         info->hue = value;
 975         ov7670_calc_cmatrix(info, matrix);
 976         ret = ov7670_store_cmatrix(client, matrix);
 977         return ret;
 978 }
 979
 980
 981 static int ov7670_q_hue(struct i2c_client *client, __s32 *value)
 982 {
 983         struct ov7670_info *info = i2c_get_clientdata(client);
 984
 985         *value = info->hue;
 986         return 0;
 987 }
 988
 989
 990 /*
 991  * Some weird registers seem to store values in a sign/magnitude format!
 992  */
 993 static unsigned char ov7670_sm_to_abs(unsigned char v)
 994 {
 995         if ((v & 0x80) == 0)
 996                 return v + 128;
 997         else
 998                 return 128 - (v & 0x7f);
 999 }
1000
1001
1002 static unsigned char ov7670_abs_to_sm(unsigned char v)
1003 {
1004         if (v > 127)
1005                 return v & 0x7f;
1006         else
1007                 return (128 - v) | 0x80;
1008 }
1009
1010 static int ov7670_t_brightness(struct i2c_client *client, int value)
1011 {
1012         unsigned char com8 = 0, v;
1013         int ret;
1014
1015         ov7670_read(client, REG_COM8, &com8);
1016         com8 &= ~COM8_AEC;
1017         ov7670_write(client, REG_COM8, com8);
1018         v = ov7670_abs_to_sm(value);
1019         ret = ov7670_write(client, REG_BRIGHT, v);
1020         return ret;
1021 }
1022
1023 static int ov7670_q_brightness(struct i2c_client *client, __s32 *value)
1024 {
1025         unsigned char v = 0;
1026         int ret = ov7670_read(client, REG_BRIGHT, &v);
1027
1028         *value = ov7670_sm_to_abs(v);
1029         return ret;
1030 }
1031
1032 static int ov7670_t_contrast(struct i2c_client *client, int value)
1033 {
1034         return ov7670_write(client, REG_CONTRAS, (unsigned char) value);
1035 }
1036
1037 static int ov7670_q_contrast(struct i2c_client *client, __s32 *value)
1038 {
1039         unsigned char v = 0;
1040         int ret = ov7670_read(client, REG_CONTRAS, &v);
1041
1042         *value = v;
1043         return ret;
1044 }
1045
1046 static int ov7670_q_hflip(struct i2c_client *client, __s32 *value)
1047 {
1048         int ret;
1049         unsigned char v = 0;
1050
1051         ret = ov7670_read(client, REG_MVFP, &v);
1052         *value = (v & MVFP_MIRROR) == MVFP_MIRROR;
1053         return ret;
1054 }
1055
1056
1057 static int ov7670_t_hflip(struct i2c_client *client, int value)
1058 {
1059         unsigned char v = 0;
1060         int ret;
1061
1062         ret = ov7670_read(client, REG_MVFP, &v);
1063         if (value)
1064                 v |= MVFP_MIRROR;
1065         else
1066                 v &= ~MVFP_MIRROR;
1067         msleep(10);  /* FIXME */
1068         ret += ov7670_write(client, REG_MVFP, v);
1069         return ret;
1070 }
1071
1072
1073
1074 static int ov7670_q_vflip(struct i2c_client *client, __s32 *value)
1075 {
1076         int ret;
1077         unsigned char v = 0;
1078
1079         ret = ov7670_read(client, REG_MVFP, &v);
1080         *value = (v & MVFP_FLIP) == MVFP_FLIP;
1081         return ret;
1082 }
1083
1084
1085 static int ov7670_t_vflip(struct i2c_client *client, int value)
1086 {
1087         unsigned char v = 0;
1088         int ret;
1089
1090         ret = ov7670_read(client, REG_MVFP, &v);
1091         if (value)
1092                 v |= MVFP_FLIP;
1093         else
1094                 v &= ~MVFP_FLIP;
1095         msleep(10);  /* FIXME */
1096         ret += ov7670_write(client, REG_MVFP, v);
1097         return ret;
1098 }
1099
1100
1101 static struct ov7670_control {
1102         struct v4l2_queryctrl qc;
1103         int (*query)(struct i2c_client *c, __s32 *value);
1104         int (*tweak)(struct i2c_client *c, int value);
1105 } ov7670_controls[] =
1106 {
1107         {
1108                 .qc = {
1109                         .id = V4L2_CID_BRIGHTNESS,
1110                         .type = V4L2_CTRL_TYPE_INTEGER,
1111                         .name = "Brightness",
1112                         .minimum = 0,
1113                         .maximum = 255,
1114                         .step = 1,
1115                         .default_value = 0x80,
1116                         .flags = V4L2_CTRL_FLAG_SLIDER
1117                 },
1118                 .tweak = ov7670_t_brightness,
1119                 .query = ov7670_q_brightness,
1120         },
1121         {
1122                 .qc = {
1123                         .id = V4L2_CID_CONTRAST,
1124                         .type = V4L2_CTRL_TYPE_INTEGER,
1125                         .name = "Contrast",
1126                         .minimum = 0,
1127                         .maximum = 127,
1128                         .step = 1,
1129                         .default_value = 0x40,   /* XXX ov7670 spec */
1130                         .flags = V4L2_CTRL_FLAG_SLIDER
1131                 },
1132                 .tweak = ov7670_t_contrast,
1133                 .query = ov7670_q_contrast,
1134         },
1135         {
1136                 .qc = {
1137                         .id = V4L2_CID_SATURATION,
1138                         .type = V4L2_CTRL_TYPE_INTEGER,
1139                         .name = "Saturation",
1140                         .minimum = 0,
1141                         .maximum = 256,
1142                         .step = 1,
1143                         .default_value = 0x80,
1144                         .flags = V4L2_CTRL_FLAG_SLIDER
1145                 },
1146                 .tweak = ov7670_t_sat,
1147                 .query = ov7670_q_sat,
1148         },
1149         {
1150                 .qc = {
1151                         .id = V4L2_CID_HUE,
1152                         .type = V4L2_CTRL_TYPE_INTEGER,
1153                         .name = "HUE",
1154                         .minimum = -180,
1155                         .maximum = 180,
1156                         .step = 5,
1157                         .default_value = 0,
1158                         .flags = V4L2_CTRL_FLAG_SLIDER
1159                 },
1160                 .tweak = ov7670_t_hue,
1161                 .query = ov7670_q_hue,
1162         },
1163         {
1164                 .qc = {
1165                         .id = V4L2_CID_VFLIP,
1166                         .type = V4L2_CTRL_TYPE_BOOLEAN,
1167                         .name = "Vertical flip",
1168                         .minimum = 0,
1169                         .maximum = 1,
1170                         .step = 1,
1171                         .default_value = 0,
1172                 },
1173                 .tweak = ov7670_t_vflip,
1174                 .query = ov7670_q_vflip,
1175         },
1176         {
1177                 .qc = {
1178                         .id = V4L2_CID_HFLIP,
1179                         .type = V4L2_CTRL_TYPE_BOOLEAN,
1180                         .name = "Horizontal mirror",
1181                         .minimum = 0,
1182                         .maximum = 1,
1183                         .step = 1,
1184                         .default_value = 0,
1185                 },
1186                 .tweak = ov7670_t_hflip,
1187                 .query = ov7670_q_hflip,
1188         },
1189 };
1190 #define N_CONTROLS (ARRAY_SIZE(ov7670_controls))
1191
1192 static struct ov7670_control *ov7670_find_control(__u32 id)
1193 {
1194         int i;
1195
1196         for (i = 0; i < N_CONTROLS; i++)
1197                 if (ov7670_controls[i].qc.id == id)
1198                         return ov7670_controls + i;
1199         return NULL;
1200 }
1201
1202
1203 static int ov7670_queryctrl(struct i2c_client *client,
1204                 struct v4l2_queryctrl *qc)
1205 {
1206         struct ov7670_control *ctrl = ov7670_find_control(qc->id);
1207
1208         if (ctrl == NULL)
1209                 return -EINVAL;
1210         *qc = ctrl->qc;
1211         return 0;
1212 }
1213
1214 static int ov7670_g_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1215 {
1216         struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
1217         int ret;
1218
1219         if (octrl == NULL)
1220                 return -EINVAL;
1221         ret = octrl->query(client, &ctrl->value);
1222         if (ret >= 0)
1223                 return 0;
1224         return ret;
1225 }
1226
1227 static int ov7670_s_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
1228 {
1229         struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
1230         int ret;
1231
1232         if (octrl == NULL)
1233                 return -EINVAL;
1234         ret =  octrl->tweak(client, ctrl->value);
1235         if (ret >= 0)
1236                 return 0;
1237         return ret;
1238 }
1239
1240
1241
1242
1243
1244
1245 /*
1246  * Basic i2c stuff.
1247  */
1248 static struct i2c_driver ov7670_driver;
1249
1250 static int ov7670_attach(struct i2c_adapter *adapter)
1251 {
1252         int ret;
1253         struct i2c_client *client;
1254         struct ov7670_info *info;
1255
1256         /*
1257          * For now: only deal with adapters we recognize.
1258          */
1259         if (adapter->id != I2C_HW_SMBUS_CAFE)
1260                 return -ENODEV;
1261
1262         client = kzalloc(sizeof (struct i2c_client), GFP_KERNEL);
1263         if (! client)
1264                 return -ENOMEM;
1265         client->adapter = adapter;
1266         client->addr = OV7670_I2C_ADDR;
1267         client->driver = &ov7670_driver,
1268         strcpy(client->name, "OV7670");
1269         /*
1270          * Set up our info structure.
1271          */
1272         info = kzalloc(sizeof (struct ov7670_info), GFP_KERNEL);
1273         if (! info) {
1274                 ret = -ENOMEM;
1275                 goto out_free;
1276         }
1277         info->fmt = &ov7670_formats[0];
1278         info->sat = 128;        /* Review this */
1279         i2c_set_clientdata(client, info);
1280
1281         /*
1282          * Make sure it's an ov7670
1283          */
1284         ret = ov7670_detect(client);
1285         if (ret)
1286                 goto out_free_info;
1287         ret = i2c_attach_client(client);
1288         if (ret)
1289                 goto out_free_info;
1290         return 0;
1291
1292   out_free_info:
1293         kfree(info);
1294   out_free:
1295         kfree(client);
1296         return ret;
1297 }
1298
1299
1300 static int ov7670_detach(struct i2c_client *client)
1301 {
1302         i2c_detach_client(client);
1303         kfree(i2c_get_clientdata(client));
1304         kfree(client);
1305         return 0;
1306 }
1307
1308
1309 static int ov7670_command(struct i2c_client *client, unsigned int cmd,
1310                 void *arg)
1311 {
1312         switch (cmd) {
1313         case VIDIOC_G_CHIP_IDENT:
1314                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_OV7670, 0);
1315
1316         case VIDIOC_INT_RESET:
1317                 ov7670_reset(client);
1318                 return 0;
1319
1320         case VIDIOC_INT_INIT:
1321                 return ov7670_init(client);
1322
1323         case VIDIOC_ENUM_FMT:
1324                 return ov7670_enum_fmt(client, (struct v4l2_fmtdesc *) arg);
1325         case VIDIOC_TRY_FMT:
1326                 return ov7670_try_fmt(client, (struct v4l2_format *) arg, NULL, NULL);
1327         case VIDIOC_S_FMT:
1328                 return ov7670_s_fmt(client, (struct v4l2_format *) arg);
1329         case VIDIOC_QUERYCTRL:
1330                 return ov7670_queryctrl(client, (struct v4l2_queryctrl *) arg);
1331         case VIDIOC_S_CTRL:
1332                 return ov7670_s_ctrl(client, (struct v4l2_control *) arg);
1333         case VIDIOC_G_CTRL:
1334                 return ov7670_g_ctrl(client, (struct v4l2_control *) arg);
1335         case VIDIOC_S_PARM:
1336                 return ov7670_s_parm(client, (struct v4l2_streamparm *) arg);
1337         case VIDIOC_G_PARM:
1338                 return ov7670_g_parm(client, (struct v4l2_streamparm *) arg);
1339         }
1340         return -EINVAL;
1341 }
1342
1343
1344
1345 static struct i2c_driver ov7670_driver = {
1346         .driver = {
1347                 .name = "ov7670",
1348         },
1349         .id             = I2C_DRIVERID_OV7670,
1350         .class          = I2C_CLASS_CAM_DIGITAL,
1351         .attach_adapter = ov7670_attach,
1352         .detach_client  = ov7670_detach,
1353         .command        = ov7670_command,
1354 };
1355
1356
1357 /*
1358  * Module initialization
1359  */
1360 static int __init ov7670_mod_init(void)
1361 {
1362         printk(KERN_NOTICE "OmniVision ov7670 sensor driver, at your service\n");
1363         return i2c_add_driver(&ov7670_driver);
1364 }
1365
1366 static void __exit ov7670_mod_exit(void)
1367 {
1368         i2c_del_driver(&ov7670_driver);
1369 }
1370
1371 module_init(ov7670_mod_init);
1372 module_exit(ov7670_mod_exit);