drivers/media/video/ovcamchip/ov6x30.c

   1 /* OmniVision OV6630/OV6130 Camera Chip Support Code
   2  *
   3  * Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
   4  * http://alpha.dyndns.org/ov511/
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version. NO WARRANTY OF ANY KIND is expressed or implied.
  10  */
  11
  12 #define DEBUG
  13
  14 #include <linux/slab.h>
  15 #include "ovcamchip_priv.h"
  16
  17 /* Registers */
  18 #define REG_GAIN                0x00    /* gain [5:0] */
  19 #define REG_BLUE                0x01    /* blue gain */
  20 #define REG_RED                 0x02    /* red gain */
  21 #define REG_SAT                 0x03    /* saturation [7:3] */
  22 #define REG_CNT                 0x05    /* Y contrast [3:0] */
  23 #define REG_BRT                 0x06    /* Y brightness */
  24 #define REG_SHARP               0x07    /* sharpness */
  25 #define REG_WB_BLUE             0x0C    /* WB blue ratio [5:0] */
  26 #define REG_WB_RED              0x0D    /* WB red ratio [5:0] */
  27 #define REG_EXP                 0x10    /* exposure */
  28
  29 /* Window parameters */
  30 #define HWSBASE 0x38
  31 #define HWEBASE 0x3A
  32 #define VWSBASE 0x05
  33 #define VWEBASE 0x06
  34
  35 struct ov6x30 {
  36         int auto_brt;
  37         int auto_exp;
  38         int backlight;
  39         int bandfilt;
  40         int mirror;
  41 };
  42
  43 static struct ovcamchip_regvals regvals_init_6x30[] = {
  44         { 0x12, 0x80 }, /* reset */
  45         { 0x00, 0x1f }, /* Gain */
  46         { 0x01, 0x99 }, /* Blue gain */
  47         { 0x02, 0x7c }, /* Red gain */
  48         { 0x03, 0xc0 }, /* Saturation */
  49         { 0x05, 0x0a }, /* Contrast */
  50         { 0x06, 0x95 }, /* Brightness */
  51         { 0x07, 0x2d }, /* Sharpness */
  52         { 0x0c, 0x20 },
  53         { 0x0d, 0x20 },
  54         { 0x0e, 0x20 },
  55         { 0x0f, 0x05 },
  56         { 0x10, 0x9a }, /* "exposure check" */
  57         { 0x11, 0x00 }, /* Pixel clock = fastest */
  58         { 0x12, 0x24 }, /* Enable AGC and AWB */
  59         { 0x13, 0x21 },
  60         { 0x14, 0x80 },
  61         { 0x15, 0x01 },
  62         { 0x16, 0x03 },
  63         { 0x17, 0x38 },
  64         { 0x18, 0xea },
  65         { 0x19, 0x04 },
  66         { 0x1a, 0x93 },
  67         { 0x1b, 0x00 },
  68         { 0x1e, 0xc4 },
  69         { 0x1f, 0x04 },
  70         { 0x20, 0x20 },
  71         { 0x21, 0x10 },
  72         { 0x22, 0x88 },
  73         { 0x23, 0xc0 }, /* Crystal circuit power level */
  74         { 0x25, 0x9a }, /* Increase AEC black pixel ratio */
  75         { 0x26, 0xb2 }, /* BLC enable */
  76         { 0x27, 0xa2 },
  77         { 0x28, 0x00 },
  78         { 0x29, 0x00 },
  79         { 0x2a, 0x84 }, /* (keep) */
  80         { 0x2b, 0xa8 }, /* (keep) */
  81         { 0x2c, 0xa0 },
  82         { 0x2d, 0x95 }, /* Enable auto-brightness */
  83         { 0x2e, 0x88 },
  84         { 0x33, 0x26 },
  85         { 0x34, 0x03 },
  86         { 0x36, 0x8f },
  87         { 0x37, 0x80 },
  88         { 0x38, 0x83 },
  89         { 0x39, 0x80 },
  90         { 0x3a, 0x0f },
  91         { 0x3b, 0x3c },
  92         { 0x3c, 0x1a },
  93         { 0x3d, 0x80 },
  94         { 0x3e, 0x80 },
  95         { 0x3f, 0x0e },
  96         { 0x40, 0x00 }, /* White bal */
  97         { 0x41, 0x00 }, /* White bal */
  98         { 0x42, 0x80 },
  99         { 0x43, 0x3f }, /* White bal */
 100         { 0x44, 0x80 },
 101         { 0x45, 0x20 },
 102         { 0x46, 0x20 },
 103         { 0x47, 0x80 },
 104         { 0x48, 0x7f },
 105         { 0x49, 0x00 },
 106         { 0x4a, 0x00 },
 107         { 0x4b, 0x80 },
 108         { 0x4c, 0xd0 },
 109         { 0x4d, 0x10 }, /* U = 0.563u, V = 0.714v */
 110         { 0x4e, 0x40 },
 111         { 0x4f, 0x07 }, /* UV average mode, color killer: strongest */
 112         { 0x50, 0xff },
 113         { 0x54, 0x23 }, /* Max AGC gain: 18dB */
 114         { 0x55, 0xff },
 115         { 0x56, 0x12 },
 116         { 0x57, 0x81 }, /* (default) */
 117         { 0x58, 0x75 },
 118         { 0x59, 0x01 }, /* AGC dark current compensation: +1 */
 119         { 0x5a, 0x2c },
 120         { 0x5b, 0x0f }, /* AWB chrominance levels */
 121         { 0x5c, 0x10 },
 122         { 0x3d, 0x80 },
 123         { 0x27, 0xa6 },
 124         /* Toggle AWB off and on */
 125         { 0x12, 0x20 },
 126         { 0x12, 0x24 },
 127
 128         { 0xff, 0xff }, /* END MARKER */
 129 };
 130
 131 /* This initializes the OV6x30 camera chip and relevant variables. */
 132 static int ov6x30_init(struct i2c_client *c)
 133 {
 134         struct ovcamchip *ov = i2c_get_clientdata(c);
 135         struct ov6x30 *s;
 136         int rc;
 137
 138         DDEBUG(4, &c->dev, "entered");
 139
 140         rc = ov_write_regvals(c, regvals_init_6x30);
 141         if (rc < 0)
 142                 return rc;
 143
 144         ov->spriv = s = kzalloc(sizeof *s, GFP_KERNEL);
 145         if (!s)
 146                 return -ENOMEM;
 147
 148         s->auto_brt = 1;
 149         s->auto_exp = 1;
 150
 151         return rc;
 152 }
 153
 154 static int ov6x30_free(struct i2c_client *c)
 155 {
 156         struct ovcamchip *ov = i2c_get_clientdata(c);
 157
 158         kfree(ov->spriv);
 159         return 0;
 160 }
 161
 162 static int ov6x30_set_control(struct i2c_client *c,
 163                               struct ovcamchip_control *ctl)
 164 {
 165         struct ovcamchip *ov = i2c_get_clientdata(c);
 166         struct ov6x30 *s = ov->spriv;
 167         int rc;
 168         int v = ctl->value;
 169
 170         switch (ctl->id) {
 171         case OVCAMCHIP_CID_CONT:
 172                 rc = ov_write_mask(c, REG_CNT, v >> 12, 0x0f);
 173                 break;
 174         case OVCAMCHIP_CID_BRIGHT:
 175                 rc = ov_write(c, REG_BRT, v >> 8);
 176                 break;
 177         case OVCAMCHIP_CID_SAT:
 178                 rc = ov_write(c, REG_SAT, v >> 8);
 179                 break;
 180         case OVCAMCHIP_CID_HUE:
 181                 rc = ov_write(c, REG_RED, 0xFF - (v >> 8));
 182                 if (rc < 0)
 183                         goto out;
 184
 185                 rc = ov_write(c, REG_BLUE, v >> 8);
 186                 break;
 187         case OVCAMCHIP_CID_EXP:
 188                 rc = ov_write(c, REG_EXP, v);
 189                 break;
 190         case OVCAMCHIP_CID_FREQ:
 191         {
 192                 int sixty = (v == 60);
 193
 194                 rc = ov_write(c, 0x2b, sixty?0xa8:0x28);
 195                 if (rc < 0)
 196                         goto out;
 197
 198                 rc = ov_write(c, 0x2a, sixty?0x84:0xa4);
 199                 break;
 200         }
 201         case OVCAMCHIP_CID_BANDFILT:
 202                 rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
 203                 s->bandfilt = v;
 204                 break;
 205         case OVCAMCHIP_CID_AUTOBRIGHT:
 206                 rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
 207                 s->auto_brt = v;
 208                 break;
 209         case OVCAMCHIP_CID_AUTOEXP:
 210                 rc = ov_write_mask(c, 0x28, v?0x00:0x10, 0x10);
 211                 s->auto_exp = v;
 212                 break;
 213         case OVCAMCHIP_CID_BACKLIGHT:
 214         {
 215                 rc = ov_write_mask(c, 0x4e, v?0x80:0x60, 0xe0);
 216                 if (rc < 0)
 217                         goto out;
 218
 219                 rc = ov_write_mask(c, 0x29, v?0x08:0x00, 0x08);
 220                 if (rc < 0)
 221                         goto out;
 222
 223                 rc = ov_write_mask(c, 0x28, v?0x02:0x00, 0x02);
 224                 s->backlight = v;
 225                 break;
 226         }
 227         case OVCAMCHIP_CID_MIRROR:
 228                 rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
 229                 s->mirror = v;
 230                 break;
 231         default:
 232                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 233                 return -EPERM;
 234         }
 235
 236 out:
 237         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
 238         return rc;
 239 }
 240
 241 static int ov6x30_get_control(struct i2c_client *c,
 242                               struct ovcamchip_control *ctl)
 243 {
 244         struct ovcamchip *ov = i2c_get_clientdata(c);
 245         struct ov6x30 *s = ov->spriv;
 246         int rc = 0;
 247         unsigned char val = 0;
 248
 249         switch (ctl->id) {
 250         case OVCAMCHIP_CID_CONT:
 251                 rc = ov_read(c, REG_CNT, &val);
 252                 ctl->value = (val & 0x0f) << 12;
 253                 break;
 254         case OVCAMCHIP_CID_BRIGHT:
 255                 rc = ov_read(c, REG_BRT, &val);
 256                 ctl->value = val << 8;
 257                 break;
 258         case OVCAMCHIP_CID_SAT:
 259                 rc = ov_read(c, REG_SAT, &val);
 260                 ctl->value = val << 8;
 261                 break;
 262         case OVCAMCHIP_CID_HUE:
 263                 rc = ov_read(c, REG_BLUE, &val);
 264                 ctl->value = val << 8;
 265                 break;
 266         case OVCAMCHIP_CID_EXP:
 267                 rc = ov_read(c, REG_EXP, &val);
 268                 ctl->value = val;
 269                 break;
 270         case OVCAMCHIP_CID_BANDFILT:
 271                 ctl->value = s->bandfilt;
 272                 break;
 273         case OVCAMCHIP_CID_AUTOBRIGHT:
 274                 ctl->value = s->auto_brt;
 275                 break;
 276         case OVCAMCHIP_CID_AUTOEXP:
 277                 ctl->value = s->auto_exp;
 278                 break;
 279         case OVCAMCHIP_CID_BACKLIGHT:
 280                 ctl->value = s->backlight;
 281                 break;
 282         case OVCAMCHIP_CID_MIRROR:
 283                 ctl->value = s->mirror;
 284                 break;
 285         default:
 286                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 287                 return -EPERM;
 288         }
 289
 290         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
 291         return rc;
 292 }
 293
 294 static int ov6x30_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
 295 {
 296         /******** QCIF-specific regs ********/
 297
 298         ov_write_mask(c, 0x14, win->quarter?0x20:0x00, 0x20);
 299
 300         /******** Palette-specific regs ********/
 301
 302         if (win->format == VIDEO_PALETTE_GREY) {
 303                 if (c->adapter->id == I2C_HW_SMBUS_OV518) {
 304                         /* Do nothing - we're already in 8-bit mode */
 305                 } else {
 306                         ov_write_mask(c, 0x13, 0x20, 0x20);
 307                 }
 308         } else {
 309                 /* The OV518 needs special treatment. Although both the OV518
 310                  * and the OV6630 support a 16-bit video bus, only the 8 bit Y
 311                  * bus is actually used. The UV bus is tied to ground.
 312                  * Therefore, the OV6630 needs to be in 8-bit multiplexed
 313                  * output mode */
 314
 315                 if (c->adapter->id == I2C_HW_SMBUS_OV518) {
 316                         /* Do nothing - we want to stay in 8-bit mode */
 317                         /* Warning: Messing with reg 0x13 breaks OV518 color */
 318                 } else {
 319                         ov_write_mask(c, 0x13, 0x00, 0x20);
 320                 }
 321         }
 322
 323         /******** Clock programming ********/
 324
 325         ov_write(c, 0x11, win->clockdiv);
 326
 327         return 0;
 328 }
 329
 330 static int ov6x30_set_window(struct i2c_client *c, struct ovcamchip_window *win)
 331 {
 332         int ret, hwscale, vwscale;
 333
 334         ret = ov6x30_mode_init(c, win);
 335         if (ret < 0)
 336                 return ret;
 337
 338         if (win->quarter) {
 339                 hwscale = 0;
 340                 vwscale = 0;
 341         } else {
 342                 hwscale = 1;
 343                 vwscale = 1;    /* The datasheet says 0; it's wrong */
 344         }
 345
 346         ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
 347         ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
 348         ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
 349         ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));
 350
 351         return 0;
 352 }
 353
 354 static int ov6x30_command(struct i2c_client *c, unsigned int cmd, void *arg)
 355 {
 356         switch (cmd) {
 357         case OVCAMCHIP_CMD_S_CTRL:
 358                 return ov6x30_set_control(c, arg);
 359         case OVCAMCHIP_CMD_G_CTRL:
 360                 return ov6x30_get_control(c, arg);
 361         case OVCAMCHIP_CMD_S_MODE:
 362                 return ov6x30_set_window(c, arg);
 363         default:
 364                 DDEBUG(2, &c->dev, "command not supported: %d", cmd);
 365                 return -ENOIOCTLCMD;
 366         }
 367 }
 368
 369 struct ovcamchip_ops ov6x30_ops = {
 370         .init    =      ov6x30_init,
 371         .free    =      ov6x30_free,
 372         .command =      ov6x30_command,
 373 };