root/drivers/media/usb/stkwebcam/stk-sensor.c

DEFINITIONS

1. stk_sensor_outb
2. stk_sensor_inb
3. stk_sensor_write_regvals
4. stk_sensor_sleep
5. stk_sensor_wakeup
6. stk_sensor_init
7. stk_sensor_set_hw
8. stk_sensor_configure
9. stk_sensor_set_brightness

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* stk-sensor.c: Driver for ov96xx sensor (used in some Syntek webcams)
   3  *
   4  * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
   5  *
   6  * Some parts derived from ov7670.c:
   7  * Copyright 2006 One Laptop Per Child Association, Inc.  Written
   8  * by Jonathan Corbet with substantial inspiration from Mark
   9  * McClelland's ovcamchip code.
  10  *
  11  * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
  12  *
  13  * This file may be distributed under the terms of the GNU General
  14  */
  15 
  16 /* Controlling the sensor via the STK1125 vendor specific control interface:
  17  * The camera uses an OmniVision sensor and the stk1125 provides an
  18  * SCCB(i2c)-USB bridge which let us program the sensor.
  19  * In my case the sensor id is 0x9652, it can be read from sensor's register
  20  * 0x0A and 0x0B as follows:
  21  * - read register #R:
  22  *   output #R to index 0x0208
  23  *   output 0x0070 to index 0x0200
  24  *   input 1 byte from index 0x0201 (some kind of status register)
  25  *     until its value is 0x01
  26  *   input 1 byte from index 0x0209. This is the value of #R
  27  * - write value V to register #R
  28  *   output #R to index 0x0204
  29  *   output V to index 0x0205
  30  *   output 0x0005 to index 0x0200
  31  *   input 1 byte from index 0x0201 until its value becomes 0x04
  32  */
  33 
  34 /* It seems the i2c bus is controlled with these registers */
  35 
  36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  37 
  38 #include "stk-webcam.h"
  39 
  40 #define STK_IIC_BASE            (0x0200)
  41 #  define STK_IIC_OP            (STK_IIC_BASE)
  42 #    define STK_IIC_OP_TX       (0x05)
  43 #    define STK_IIC_OP_RX       (0x70)
  44 #  define STK_IIC_STAT          (STK_IIC_BASE+1)
  45 #    define STK_IIC_STAT_TX_OK  (0x04)
  46 #    define STK_IIC_STAT_RX_OK  (0x01)
  47 /* I don't know what does this register.
  48  * when it is 0x00 or 0x01, we cannot talk to the sensor,
  49  * other values work */
  50 #  define STK_IIC_ENABLE        (STK_IIC_BASE+2)
  51 #    define STK_IIC_ENABLE_NO   (0x00)
  52 /* This is what the driver writes in windows */
  53 #    define STK_IIC_ENABLE_YES  (0x1e)
  54 /*
  55  * Address of the slave. Seems like the binary driver look for the
  56  * sensor in multiple places, attempting a reset sequence.
  57  * We only know about the ov9650
  58  */
  59 #  define STK_IIC_ADDR          (STK_IIC_BASE+3)
  60 #  define STK_IIC_TX_INDEX      (STK_IIC_BASE+4)
  61 #  define STK_IIC_TX_VALUE      (STK_IIC_BASE+5)
  62 #  define STK_IIC_RX_INDEX      (STK_IIC_BASE+8)
  63 #  define STK_IIC_RX_VALUE      (STK_IIC_BASE+9)
  64 
  65 #define MAX_RETRIES             (50)
  66 
  67 #define SENSOR_ADDRESS          (0x60)
  68 
  69 /* From ov7670.c (These registers aren't fully accurate) */
  70 
  71 /* Registers */
  72 #define REG_GAIN        0x00    /* Gain lower 8 bits (rest in vref) */
  73 #define REG_BLUE        0x01    /* blue gain */
  74 #define REG_RED         0x02    /* red gain */
  75 #define REG_VREF        0x03    /* Pieces of GAIN, VSTART, VSTOP */
  76 #define REG_COM1        0x04    /* Control 1 */
  77 #define  COM1_CCIR656     0x40  /* CCIR656 enable */
  78 #define  COM1_QFMT        0x20  /* QVGA/QCIF format */
  79 #define  COM1_SKIP_0      0x00  /* Do not skip any row */
  80 #define  COM1_SKIP_2      0x04  /* Skip 2 rows of 4 */
  81 #define  COM1_SKIP_3      0x08  /* Skip 3 rows of 4 */
  82 #define REG_BAVE        0x05    /* U/B Average level */
  83 #define REG_GbAVE       0x06    /* Y/Gb Average level */
  84 #define REG_AECHH       0x07    /* AEC MS 5 bits */
  85 #define REG_RAVE        0x08    /* V/R Average level */
  86 #define REG_COM2        0x09    /* Control 2 */
  87 #define  COM2_SSLEEP      0x10  /* Soft sleep mode */
  88 #define REG_PID         0x0a    /* Product ID MSB */
  89 #define REG_VER         0x0b    /* Product ID LSB */
  90 #define REG_COM3        0x0c    /* Control 3 */
  91 #define  COM3_SWAP        0x40    /* Byte swap */
  92 #define  COM3_SCALEEN     0x08    /* Enable scaling */
  93 #define  COM3_DCWEN       0x04    /* Enable downsamp/crop/window */
  94 #define REG_COM4        0x0d    /* Control 4 */
  95 #define REG_COM5        0x0e    /* All "reserved" */
  96 #define REG_COM6        0x0f    /* Control 6 */
  97 #define REG_AECH        0x10    /* More bits of AEC value */
  98 #define REG_CLKRC       0x11    /* Clock control */
  99 #define   CLK_PLL         0x80    /* Enable internal PLL */
 100 #define   CLK_EXT         0x40    /* Use external clock directly */
 101 #define   CLK_SCALE       0x3f    /* Mask for internal clock scale */
 102 #define REG_COM7        0x12    /* Control 7 */
 103 #define   COM7_RESET      0x80    /* Register reset */
 104 #define   COM7_FMT_MASK   0x38
 105 #define   COM7_FMT_SXGA   0x00
 106 #define   COM7_FMT_VGA    0x40
 107 #define   COM7_FMT_CIF    0x20    /* CIF format */
 108 #define   COM7_FMT_QVGA   0x10    /* QVGA format */
 109 #define   COM7_FMT_QCIF   0x08    /* QCIF format */
 110 #define   COM7_RGB        0x04    /* bits 0 and 2 - RGB format */
 111 #define   COM7_YUV        0x00    /* YUV */
 112 #define   COM7_BAYER      0x01    /* Bayer format */
 113 #define   COM7_PBAYER     0x05    /* "Processed bayer" */
 114 #define REG_COM8        0x13    /* Control 8 */
 115 #define   COM8_FASTAEC    0x80    /* Enable fast AGC/AEC */
 116 #define   COM8_AECSTEP    0x40    /* Unlimited AEC step size */
 117 #define   COM8_BFILT      0x20    /* Band filter enable */
 118 #define   COM8_AGC        0x04    /* Auto gain enable */
 119 #define   COM8_AWB        0x02    /* White balance enable */
 120 #define   COM8_AEC        0x01    /* Auto exposure enable */
 121 #define REG_COM9        0x14    /* Control 9  - gain ceiling */
 122 #define REG_COM10       0x15    /* Control 10 */
 123 #define   COM10_HSYNC     0x40    /* HSYNC instead of HREF */
 124 #define   COM10_PCLK_HB   0x20    /* Suppress PCLK on horiz blank */
 125 #define   COM10_HREF_REV  0x08    /* Reverse HREF */
 126 #define   COM10_VS_LEAD   0x04    /* VSYNC on clock leading edge */
 127 #define   COM10_VS_NEG    0x02    /* VSYNC negative */
 128 #define   COM10_HS_NEG    0x01    /* HSYNC negative */
 129 #define REG_HSTART      0x17    /* Horiz start high bits */
 130 #define REG_HSTOP       0x18    /* Horiz stop high bits */
 131 #define REG_VSTART      0x19    /* Vert start high bits */
 132 #define REG_VSTOP       0x1a    /* Vert stop high bits */
 133 #define REG_PSHFT       0x1b    /* Pixel delay after HREF */
 134 #define REG_MIDH        0x1c    /* Manuf. ID high */
 135 #define REG_MIDL        0x1d    /* Manuf. ID low */
 136 #define REG_MVFP        0x1e    /* Mirror / vflip */
 137 #define   MVFP_MIRROR     0x20    /* Mirror image */
 138 #define   MVFP_FLIP       0x10    /* Vertical flip */
 139 
 140 #define REG_AEW         0x24    /* AGC upper limit */
 141 #define REG_AEB         0x25    /* AGC lower limit */
 142 #define REG_VPT         0x26    /* AGC/AEC fast mode op region */
 143 #define REG_ADVFL       0x2d    /* Insert dummy lines (LSB) */
 144 #define REG_ADVFH       0x2e    /* Insert dummy lines (MSB) */
 145 #define REG_HSYST       0x30    /* HSYNC rising edge delay */
 146 #define REG_HSYEN       0x31    /* HSYNC falling edge delay */
 147 #define REG_HREF        0x32    /* HREF pieces */
 148 #define REG_TSLB        0x3a    /* lots of stuff */
 149 #define   TSLB_YLAST      0x04    /* UYVY or VYUY - see com13 */
 150 #define   TSLB_BYTEORD    0x08    /* swap bytes in 16bit mode? */
 151 #define REG_COM11       0x3b    /* Control 11 */
 152 #define   COM11_NIGHT     0x80    /* NIght mode enable */
 153 #define   COM11_NMFR      0x60    /* Two bit NM frame rate */
 154 #define   COM11_HZAUTO    0x10    /* Auto detect 50/60 Hz */
 155 #define   COM11_50HZ      0x08    /* Manual 50Hz select */
 156 #define   COM11_EXP       0x02
 157 #define REG_COM12       0x3c    /* Control 12 */
 158 #define   COM12_HREF      0x80    /* HREF always */
 159 #define REG_COM13       0x3d    /* Control 13 */
 160 #define   COM13_GAMMA     0x80    /* Gamma enable */
 161 #define   COM13_UVSAT     0x40    /* UV saturation auto adjustment */
 162 #define   COM13_CMATRIX   0x10    /* Enable color matrix for RGB or YUV */
 163 #define   COM13_UVSWAP    0x01    /* V before U - w/TSLB */
 164 #define REG_COM14       0x3e    /* Control 14 */
 165 #define   COM14_DCWEN     0x10    /* DCW/PCLK-scale enable */
 166 #define REG_EDGE        0x3f    /* Edge enhancement factor */
 167 #define REG_COM15       0x40    /* Control 15 */
 168 #define   COM15_R10F0     0x00    /* Data range 10 to F0 */
 169 #define   COM15_R01FE     0x80    /*            01 to FE */
 170 #define   COM15_R00FF     0xc0    /*            00 to FF */
 171 #define   COM15_RGB565    0x10    /* RGB565 output */
 172 #define   COM15_RGBFIXME          0x20    /* FIXME  */
 173 #define   COM15_RGB555    0x30    /* RGB555 output */
 174 #define REG_COM16       0x41    /* Control 16 */
 175 #define   COM16_AWBGAIN   0x08    /* AWB gain enable */
 176 #define REG_COM17       0x42    /* Control 17 */
 177 #define   COM17_AECWIN    0xc0    /* AEC window - must match COM4 */
 178 #define   COM17_CBAR      0x08    /* DSP Color bar */
 179 
 180 /*
 181  * This matrix defines how the colors are generated, must be
 182  * tweaked to adjust hue and saturation.
 183  *
 184  * Order: v-red, v-green, v-blue, u-red, u-green, u-blue
 185  *
 186  * They are nine-bit signed quantities, with the sign bit
 187  * stored in 0x58.  Sign for v-red is bit 0, and up from there.
 188  */
 189 #define REG_CMATRIX_BASE 0x4f
 190 #define   CMATRIX_LEN 6
 191 #define REG_CMATRIX_SIGN 0x58
 192 
 193 
 194 #define REG_BRIGHT      0x55    /* Brightness */
 195 #define REG_CONTRAS     0x56    /* Contrast control */
 196 
 197 #define REG_GFIX        0x69    /* Fix gain control */
 198 
 199 #define REG_RGB444      0x8c    /* RGB 444 control */
 200 #define   R444_ENABLE     0x02    /* Turn on RGB444, overrides 5x5 */
 201 #define   R444_RGBX       0x01    /* Empty nibble at end */
 202 
 203 #define REG_HAECC1      0x9f    /* Hist AEC/AGC control 1 */
 204 #define REG_HAECC2      0xa0    /* Hist AEC/AGC control 2 */
 205 
 206 #define REG_BD50MAX     0xa5    /* 50hz banding step limit */
 207 #define REG_HAECC3      0xa6    /* Hist AEC/AGC control 3 */
 208 #define REG_HAECC4      0xa7    /* Hist AEC/AGC control 4 */
 209 #define REG_HAECC5      0xa8    /* Hist AEC/AGC control 5 */
 210 #define REG_HAECC6      0xa9    /* Hist AEC/AGC control 6 */
 211 #define REG_HAECC7      0xaa    /* Hist AEC/AGC control 7 */
 212 #define REG_BD60MAX     0xab    /* 60hz banding step limit */
 213 
 214 
 215 
 216 
 217 /* Returns 0 if OK */
 218 static int stk_sensor_outb(struct stk_camera *dev, u8 reg, u8 val)
 219 {
 220         int i = 0;
 221         u8 tmpval = 0;
 222 
 223         if (stk_camera_write_reg(dev, STK_IIC_TX_INDEX, reg))
 224                 return 1;
 225         if (stk_camera_write_reg(dev, STK_IIC_TX_VALUE, val))
 226                 return 1;
 227         if (stk_camera_write_reg(dev, STK_IIC_OP, STK_IIC_OP_TX))
 228                 return 1;
 229         do {
 230                 if (stk_camera_read_reg(dev, STK_IIC_STAT, &tmpval))
 231                         return 1;
 232                 i++;
 233         } while (tmpval == 0 && i < MAX_RETRIES);
 234         if (tmpval != STK_IIC_STAT_TX_OK) {
 235                 if (tmpval)
 236                         pr_err("stk_sensor_outb failed, status=0x%02x\n",
 237                                tmpval);
 238                 return 1;
 239         } else
 240                 return 0;
 241 }
 242 
 243 static int stk_sensor_inb(struct stk_camera *dev, u8 reg, u8 *val)
 244 {
 245         int i = 0;
 246         u8 tmpval = 0;
 247 
 248         if (stk_camera_write_reg(dev, STK_IIC_RX_INDEX, reg))
 249                 return 1;
 250         if (stk_camera_write_reg(dev, STK_IIC_OP, STK_IIC_OP_RX))
 251                 return 1;
 252         do {
 253                 if (stk_camera_read_reg(dev, STK_IIC_STAT, &tmpval))
 254                         return 1;
 255                 i++;
 256         } while (tmpval == 0 && i < MAX_RETRIES);
 257         if (tmpval != STK_IIC_STAT_RX_OK) {
 258                 if (tmpval)
 259                         pr_err("stk_sensor_inb failed, status=0x%02x\n",
 260                                tmpval);
 261                 return 1;
 262         }
 263 
 264         if (stk_camera_read_reg(dev, STK_IIC_RX_VALUE, &tmpval))
 265                 return 1;
 266 
 267         *val = tmpval;
 268         return 0;
 269 }
 270 
 271 static int stk_sensor_write_regvals(struct stk_camera *dev,
 272                 struct regval *rv)
 273 {
 274         int ret;
 275         if (rv == NULL)
 276                 return 0;
 277         while (rv->reg != 0xff || rv->val != 0xff) {
 278                 ret = stk_sensor_outb(dev, rv->reg, rv->val);
 279                 if (ret != 0)
 280                         return ret;
 281                 rv++;
 282         }
 283         return 0;
 284 }
 285 
 286 int stk_sensor_sleep(struct stk_camera *dev)
 287 {
 288         u8 tmp;
 289         return stk_sensor_inb(dev, REG_COM2, &tmp)
 290                 || stk_sensor_outb(dev, REG_COM2, tmp|COM2_SSLEEP);
 291 }
 292 
 293 int stk_sensor_wakeup(struct stk_camera *dev)
 294 {
 295         u8 tmp;
 296         return stk_sensor_inb(dev, REG_COM2, &tmp)
 297                 || stk_sensor_outb(dev, REG_COM2, tmp&~COM2_SSLEEP);
 298 }
 299 
 300 static struct regval ov_initvals[] = {
 301         {REG_CLKRC, CLK_PLL},
 302         {REG_COM11, 0x01},
 303         {0x6a, 0x7d},
 304         {REG_AECH, 0x40},
 305         {REG_GAIN, 0x00},
 306         {REG_BLUE, 0x80},
 307         {REG_RED, 0x80},
 308         /* Do not enable fast AEC for now */
 309         /*{REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC},*/
 310         {REG_COM8, COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC},
 311         {0x39, 0x50}, {0x38, 0x93},
 312         {0x37, 0x00}, {0x35, 0x81},
 313         {REG_COM5, 0x20},
 314         {REG_COM1, 0x00},
 315         {REG_COM3, 0x00},
 316         {REG_COM4, 0x00},
 317         {REG_PSHFT, 0x00},
 318         {0x16, 0x07},
 319         {0x33, 0xe2}, {0x34, 0xbf},
 320         {REG_COM16, 0x00},
 321         {0x96, 0x04},
 322         /* Gamma curve values */
 323 /*      { 0x7a, 0x20 },         { 0x7b, 0x10 },
 324         { 0x7c, 0x1e },         { 0x7d, 0x35 },
 325         { 0x7e, 0x5a },         { 0x7f, 0x69 },
 326         { 0x80, 0x76 },         { 0x81, 0x80 },
 327         { 0x82, 0x88 },         { 0x83, 0x8f },
 328         { 0x84, 0x96 },         { 0x85, 0xa3 },
 329         { 0x86, 0xaf },         { 0x87, 0xc4 },
 330         { 0x88, 0xd7 },         { 0x89, 0xe8 },
 331 */
 332         {REG_GFIX, 0x40},
 333         {0x8e, 0x00},
 334         {REG_COM12, 0x73},
 335         {0x8f, 0xdf}, {0x8b, 0x06},
 336         {0x8c, 0x20},
 337         {0x94, 0x88}, {0x95, 0x88},
 338 /*      {REG_COM15, 0xc1}, TODO */
 339         {0x29, 0x3f},
 340         {REG_COM6, 0x42},
 341         {REG_BD50MAX, 0x80},
 342         {REG_HAECC6, 0xb8}, {REG_HAECC7, 0x92},
 343         {REG_BD60MAX, 0x0a},
 344         {0x90, 0x00}, {0x91, 0x00},
 345         {REG_HAECC1, 0x00}, {REG_HAECC2, 0x00},
 346         {REG_AEW, 0x68}, {REG_AEB, 0x5c},
 347         {REG_VPT, 0xc3},
 348         {REG_COM9, 0x2e},
 349         {0x2a, 0x00}, {0x2b, 0x00},
 350 
 351         {0xff, 0xff}, /* END MARKER */
 352 };
 353 
 354 /* Probe the I2C bus and initialise the sensor chip */
 355 int stk_sensor_init(struct stk_camera *dev)
 356 {
 357         u8 idl = 0;
 358         u8 idh = 0;
 359 
 360         if (stk_camera_write_reg(dev, STK_IIC_ENABLE, STK_IIC_ENABLE_YES)
 361                 || stk_camera_write_reg(dev, STK_IIC_ADDR, SENSOR_ADDRESS)
 362                 || stk_sensor_outb(dev, REG_COM7, COM7_RESET)) {
 363                 pr_err("Sensor resetting failed\n");
 364                 return -ENODEV;
 365         }
 366         msleep(10);
 367         /* Read the manufacturer ID: ov = 0x7FA2 */
 368         if (stk_sensor_inb(dev, REG_MIDH, &idh)
 369             || stk_sensor_inb(dev, REG_MIDL, &idl)) {
 370                 pr_err("Strange error reading sensor ID\n");
 371                 return -ENODEV;
 372         }
 373         if (idh != 0x7f || idl != 0xa2) {
 374                 pr_err("Huh? you don't have a sensor from ovt\n");
 375                 return -ENODEV;
 376         }
 377         if (stk_sensor_inb(dev, REG_PID, &idh)
 378             || stk_sensor_inb(dev, REG_VER, &idl)) {
 379                 pr_err("Could not read sensor model\n");
 380                 return -ENODEV;
 381         }
 382         stk_sensor_write_regvals(dev, ov_initvals);
 383         msleep(10);
 384         pr_info("OmniVision sensor detected, id %02X%02X at address %x\n",
 385                 idh, idl, SENSOR_ADDRESS);
 386         return 0;
 387 }
 388 
 389 /* V4L2_PIX_FMT_UYVY */
 390 static struct regval ov_fmt_uyvy[] = {
 391         {REG_TSLB, TSLB_YLAST|0x08 },
 392         { 0x4f, 0x80 },         /* "matrix coefficient 1" */
 393         { 0x50, 0x80 },         /* "matrix coefficient 2" */
 394         { 0x51, 0    },         /* vb */
 395         { 0x52, 0x22 },         /* "matrix coefficient 4" */
 396         { 0x53, 0x5e },         /* "matrix coefficient 5" */
 397         { 0x54, 0x80 },         /* "matrix coefficient 6" */
 398         {REG_COM13, COM13_UVSAT|COM13_CMATRIX},
 399         {REG_COM15, COM15_R00FF },
 400         {0xff, 0xff}, /* END MARKER */
 401 };
 402 /* V4L2_PIX_FMT_YUYV */
 403 static struct regval ov_fmt_yuyv[] = {
 404         {REG_TSLB, 0 },
 405         { 0x4f, 0x80 },         /* "matrix coefficient 1" */
 406         { 0x50, 0x80 },         /* "matrix coefficient 2" */
 407         { 0x51, 0    },         /* vb */
 408         { 0x52, 0x22 },         /* "matrix coefficient 4" */
 409         { 0x53, 0x5e },         /* "matrix coefficient 5" */
 410         { 0x54, 0x80 },         /* "matrix coefficient 6" */
 411         {REG_COM13, COM13_UVSAT|COM13_CMATRIX},
 412         {REG_COM15, COM15_R00FF },
 413         {0xff, 0xff}, /* END MARKER */
 414 };
 415 
 416 /* V4L2_PIX_FMT_RGB565X rrrrrggg gggbbbbb */
 417 static struct regval ov_fmt_rgbr[] = {
 418         { REG_RGB444, 0 },      /* No RGB444 please */
 419         {REG_TSLB, 0x00},
 420         { REG_COM1, 0x0 },
 421         { REG_COM9, 0x38 },     /* 16x gain ceiling; 0x8 is reserved bit */
 422         { 0x4f, 0xb3 },         /* "matrix coefficient 1" */
 423         { 0x50, 0xb3 },         /* "matrix coefficient 2" */
 424         { 0x51, 0    },         /* vb */
 425         { 0x52, 0x3d },         /* "matrix coefficient 4" */
 426         { 0x53, 0xa7 },         /* "matrix coefficient 5" */
 427         { 0x54, 0xe4 },         /* "matrix coefficient 6" */
 428         { REG_COM13, COM13_GAMMA },
 429         { REG_COM15, COM15_RGB565|COM15_R00FF },
 430         { 0xff, 0xff },
 431 };
 432 
 433 /* V4L2_PIX_FMT_RGB565 gggbbbbb rrrrrggg */
 434 static struct regval ov_fmt_rgbp[] = {
 435         { REG_RGB444, 0 },      /* No RGB444 please */
 436         {REG_TSLB, TSLB_BYTEORD },
 437         { REG_COM1, 0x0 },
 438         { REG_COM9, 0x38 },     /* 16x gain ceiling; 0x8 is reserved bit */
 439         { 0x4f, 0xb3 },         /* "matrix coefficient 1" */
 440         { 0x50, 0xb3 },         /* "matrix coefficient 2" */
 441         { 0x51, 0    },         /* vb */
 442         { 0x52, 0x3d },         /* "matrix coefficient 4" */
 443         { 0x53, 0xa7 },         /* "matrix coefficient 5" */
 444         { 0x54, 0xe4 },         /* "matrix coefficient 6" */
 445         { REG_COM13, COM13_GAMMA },
 446         { REG_COM15, COM15_RGB565|COM15_R00FF },
 447         { 0xff, 0xff },
 448 };
 449 
 450 /* V4L2_PIX_FMT_SRGGB8 */
 451 static struct regval ov_fmt_bayer[] = {
 452         /* This changes color order */
 453         {REG_TSLB, 0x40}, /* BGGR */
 454         /* {REG_TSLB, 0x08}, */ /* BGGR with vertical image flipping */
 455         {REG_COM15, COM15_R00FF },
 456         {0xff, 0xff}, /* END MARKER */
 457 };
 458 /*
 459  * Store a set of start/stop values into the camera.
 460  */
 461 static int stk_sensor_set_hw(struct stk_camera *dev,
 462                 int hstart, int hstop, int vstart, int vstop)
 463 {
 464         int ret;
 465         unsigned char v;
 466 /*
 467  * Horizontal: 11 bits, top 8 live in hstart and hstop.  Bottom 3 of
 468  * hstart are in href[2:0], bottom 3 of hstop in href[5:3].  There is
 469  * a mystery "edge offset" value in the top two bits of href.
 470  */
 471         ret =  stk_sensor_outb(dev, REG_HSTART, (hstart >> 3) & 0xff);
 472         ret += stk_sensor_outb(dev, REG_HSTOP, (hstop >> 3) & 0xff);
 473         ret += stk_sensor_inb(dev, REG_HREF, &v);
 474         v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
 475         msleep(10);
 476         ret += stk_sensor_outb(dev, REG_HREF, v);
 477 /*
 478  * Vertical: similar arrangement (note: this is different from ov7670.c)
 479  */
 480         ret += stk_sensor_outb(dev, REG_VSTART, (vstart >> 3) & 0xff);
 481         ret += stk_sensor_outb(dev, REG_VSTOP, (vstop >> 3) & 0xff);
 482         ret += stk_sensor_inb(dev, REG_VREF, &v);
 483         v = (v & 0xc0) | ((vstop & 0x7) << 3) | (vstart & 0x7);
 484         msleep(10);
 485         ret += stk_sensor_outb(dev, REG_VREF, v);
 486         return ret;
 487 }
 488 
 489 
 490 int stk_sensor_configure(struct stk_camera *dev)
 491 {
 492         int com7;
 493         /*
 494          * We setup the sensor to output dummy lines in low-res modes,
 495          * so we don't get absurdly hight framerates.
 496          */
 497         unsigned dummylines;
 498         int flip;
 499         struct regval *rv;
 500 
 501         switch (dev->vsettings.mode) {
 502         case MODE_QCIF: com7 = COM7_FMT_QCIF;
 503                 dummylines = 604;
 504                 break;
 505         case MODE_QVGA: com7 = COM7_FMT_QVGA;
 506                 dummylines = 267;
 507                 break;
 508         case MODE_CIF: com7 = COM7_FMT_CIF;
 509                 dummylines = 412;
 510                 break;
 511         case MODE_VGA: com7 = COM7_FMT_VGA;
 512                 dummylines = 11;
 513                 break;
 514         case MODE_SXGA: com7 = COM7_FMT_SXGA;
 515                 dummylines = 0;
 516                 break;
 517         default:
 518                 pr_err("Unsupported mode %d\n", dev->vsettings.mode);
 519                 return -EFAULT;
 520         }
 521         switch (dev->vsettings.palette) {
 522         case V4L2_PIX_FMT_UYVY:
 523                 com7 |= COM7_YUV;
 524                 rv = ov_fmt_uyvy;
 525                 break;
 526         case V4L2_PIX_FMT_YUYV:
 527                 com7 |= COM7_YUV;
 528                 rv = ov_fmt_yuyv;
 529                 break;
 530         case V4L2_PIX_FMT_RGB565:
 531                 com7 |= COM7_RGB;
 532                 rv = ov_fmt_rgbp;
 533                 break;
 534         case V4L2_PIX_FMT_RGB565X:
 535                 com7 |= COM7_RGB;
 536                 rv = ov_fmt_rgbr;
 537                 break;
 538         case V4L2_PIX_FMT_SBGGR8:
 539                 com7 |= COM7_PBAYER;
 540                 rv = ov_fmt_bayer;
 541                 break;
 542         default:
 543                 pr_err("Unsupported colorspace\n");
 544                 return -EFAULT;
 545         }
 546         /*FIXME sometimes the sensor go to a bad state
 547         stk_sensor_write_regvals(dev, ov_initvals); */
 548         stk_sensor_outb(dev, REG_COM7, com7);
 549         msleep(50);
 550         stk_sensor_write_regvals(dev, rv);
 551         flip = (dev->vsettings.vflip?MVFP_FLIP:0)
 552                 | (dev->vsettings.hflip?MVFP_MIRROR:0);
 553         stk_sensor_outb(dev, REG_MVFP, flip);
 554         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8
 555                         && !dev->vsettings.vflip)
 556                 stk_sensor_outb(dev, REG_TSLB, 0x08);
 557         stk_sensor_outb(dev, REG_ADVFH, dummylines >> 8);
 558         stk_sensor_outb(dev, REG_ADVFL, dummylines & 0xff);
 559         msleep(50);
 560         switch (dev->vsettings.mode) {
 561         case MODE_VGA:
 562                 if (stk_sensor_set_hw(dev, 302, 1582, 6, 486))
 563                         pr_err("stk_sensor_set_hw failed (VGA)\n");
 564                 break;
 565         case MODE_SXGA:
 566         case MODE_CIF:
 567         case MODE_QVGA:
 568         case MODE_QCIF:
 569                 /*FIXME These settings seem ignored by the sensor
 570                 if (stk_sensor_set_hw(dev, 220, 1500, 10, 1034))
 571                         pr_err("stk_sensor_set_hw failed (SXGA)\n");
 572                 */
 573                 break;
 574         }
 575         msleep(10);
 576         return 0;
 577 }
 578 
 579 int stk_sensor_set_brightness(struct stk_camera *dev, int br)
 580 {
 581         if (br < 0 || br > 0xff)
 582                 return -EINVAL;
 583         stk_sensor_outb(dev, REG_AEB, max(0x00, br - 6));
 584         stk_sensor_outb(dev, REG_AEW, min(0xff, br + 6));
 585         return 0;
 586 }
 587