drivers/media/video/ovcamchip/ov7x20.c

   1 /* OmniVision OV7620/OV7120 Camera Chip Support Code
   2  *
   3  * Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
   4  * http://alpha.dyndns.org/ov511/
   5  *
   6  * OV7620 fixes by Charl P. Botha <cpbotha@ieee.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or (at your
  11  * option) any later version. NO WARRANTY OF ANY KIND is expressed or implied.
  12  */
  13
  14 #define DEBUG
  15
  16 #include <linux/slab.h>
  17 #include "ovcamchip_priv.h"
  18
  19 /* Registers */
  20 #define REG_GAIN                0x00    /* gain [5:0] */
  21 #define REG_BLUE                0x01    /* blue gain */
  22 #define REG_RED                 0x02    /* red gain */
  23 #define REG_SAT                 0x03    /* saturation */
  24 #define REG_BRT                 0x06    /* Y brightness */
  25 #define REG_SHARP               0x07    /* analog sharpness */
  26 #define REG_BLUE_BIAS           0x0C    /* WB blue ratio [5:0] */
  27 #define REG_RED_BIAS            0x0D    /* WB red ratio [5:0] */
  28 #define REG_EXP                 0x10    /* exposure */
  29
  30 /* Default control settings. Values are in terms of V4L2 controls. */
  31 #define OV7120_DFL_BRIGHT     0x60
  32 #define OV7620_DFL_BRIGHT     0x60
  33 #define OV7120_DFL_SAT        0xb0
  34 #define OV7620_DFL_SAT        0xc0
  35 #define DFL_AUTO_EXP             1
  36 #define DFL_AUTO_GAIN            1
  37 #define OV7120_DFL_GAIN       0x00
  38 #define OV7620_DFL_GAIN       0x00
  39 /* NOTE: Since autoexposure is the default, these aren't programmed into the
  40  * OV7x20 chip. They are just here because V4L2 expects a default */
  41 #define OV7120_DFL_EXP        0x7f
  42 #define OV7620_DFL_EXP        0x7f
  43
  44 /* Window parameters */
  45 #define HWSBASE 0x2F    /* From 7620.SET (spec is wrong) */
  46 #define HWEBASE 0x2F
  47 #define VWSBASE 0x05
  48 #define VWEBASE 0x05
  49
  50 struct ov7x20 {
  51         int auto_brt;
  52         int auto_exp;
  53         int auto_gain;
  54         int backlight;
  55         int bandfilt;
  56         int mirror;
  57 };
  58
  59 /* Contrast look-up table */
  60 static unsigned char ctab[] = {
  61         0x01, 0x05, 0x09, 0x11, 0x15, 0x35, 0x37, 0x57,
  62         0x5b, 0xa5, 0xa7, 0xc7, 0xc9, 0xcf, 0xef, 0xff
  63 };
  64
  65 /* Settings for (Black & White) OV7120 camera chip */
  66 static struct ovcamchip_regvals regvals_init_7120[] = {
  67         { 0x12, 0x80 }, /* reset */
  68         { 0x13, 0x00 }, /* Autoadjust off */
  69         { 0x12, 0x20 }, /* Disable AWB */
  70         { 0x13, DFL_AUTO_GAIN?0x01:0x00 }, /* Autoadjust on (if desired) */
  71         { 0x00, OV7120_DFL_GAIN },
  72         { 0x01, 0x80 },
  73         { 0x02, 0x80 },
  74         { 0x03, OV7120_DFL_SAT },
  75         { 0x06, OV7120_DFL_BRIGHT },
  76         { 0x07, 0x00 },
  77         { 0x0c, 0x20 },
  78         { 0x0d, 0x20 },
  79         { 0x11, 0x01 },
  80         { 0x14, 0x84 },
  81         { 0x15, 0x01 },
  82         { 0x16, 0x03 },
  83         { 0x17, 0x2f },
  84         { 0x18, 0xcf },
  85         { 0x19, 0x06 },
  86         { 0x1a, 0xf5 },
  87         { 0x1b, 0x00 },
  88         { 0x20, 0x08 },
  89         { 0x21, 0x80 },
  90         { 0x22, 0x80 },
  91         { 0x23, 0x00 },
  92         { 0x26, 0xa0 },
  93         { 0x27, 0xfa },
  94         { 0x28, 0x20 }, /* DON'T set bit 6. It is for the OV7620 only */
  95         { 0x29, DFL_AUTO_EXP?0x00:0x80 },
  96         { 0x2a, 0x10 },
  97         { 0x2b, 0x00 },
  98         { 0x2c, 0x88 },
  99         { 0x2d, 0x95 },
 100         { 0x2e, 0x80 },
 101         { 0x2f, 0x44 },
 102         { 0x60, 0x20 },
 103         { 0x61, 0x02 },
 104         { 0x62, 0x5f },
 105         { 0x63, 0xd5 },
 106         { 0x64, 0x57 },
 107         { 0x65, 0x83 }, /* OV says "don't change this value" */
 108         { 0x66, 0x55 },
 109         { 0x67, 0x92 },
 110         { 0x68, 0xcf },
 111         { 0x69, 0x76 },
 112         { 0x6a, 0x22 },
 113         { 0x6b, 0xe2 },
 114         { 0x6c, 0x40 },
 115         { 0x6d, 0x48 },
 116         { 0x6e, 0x80 },
 117         { 0x6f, 0x0d },
 118         { 0x70, 0x89 },
 119         { 0x71, 0x00 },
 120         { 0x72, 0x14 },
 121         { 0x73, 0x54 },
 122         { 0x74, 0xa0 },
 123         { 0x75, 0x8e },
 124         { 0x76, 0x00 },
 125         { 0x77, 0xff },
 126         { 0x78, 0x80 },
 127         { 0x79, 0x80 },
 128         { 0x7a, 0x80 },
 129         { 0x7b, 0xe6 },
 130         { 0x7c, 0x00 },
 131         { 0x24, 0x3a },
 132         { 0x25, 0x60 },
 133         { 0xff, 0xff }, /* END MARKER */
 134 };
 135
 136 /* Settings for (color) OV7620 camera chip */
 137 static struct ovcamchip_regvals regvals_init_7620[] = {
 138         { 0x12, 0x80 }, /* reset */
 139         { 0x00, OV7620_DFL_GAIN },
 140         { 0x01, 0x80 },
 141         { 0x02, 0x80 },
 142         { 0x03, OV7620_DFL_SAT },
 143         { 0x06, OV7620_DFL_BRIGHT },
 144         { 0x07, 0x00 },
 145         { 0x0c, 0x24 },
 146         { 0x0c, 0x24 },
 147         { 0x0d, 0x24 },
 148         { 0x11, 0x01 },
 149         { 0x12, 0x24 },
 150         { 0x13, DFL_AUTO_GAIN?0x01:0x00 },
 151         { 0x14, 0x84 },
 152         { 0x15, 0x01 },
 153         { 0x16, 0x03 },
 154         { 0x17, 0x2f },
 155         { 0x18, 0xcf },
 156         { 0x19, 0x06 },
 157         { 0x1a, 0xf5 },
 158         { 0x1b, 0x00 },
 159         { 0x20, 0x18 },
 160         { 0x21, 0x80 },
 161         { 0x22, 0x80 },
 162         { 0x23, 0x00 },
 163         { 0x26, 0xa2 },
 164         { 0x27, 0xea },
 165         { 0x28, 0x20 },
 166         { 0x29, DFL_AUTO_EXP?0x00:0x80 },
 167         { 0x2a, 0x10 },
 168         { 0x2b, 0x00 },
 169         { 0x2c, 0x88 },
 170         { 0x2d, 0x91 },
 171         { 0x2e, 0x80 },
 172         { 0x2f, 0x44 },
 173         { 0x60, 0x27 },
 174         { 0x61, 0x02 },
 175         { 0x62, 0x5f },
 176         { 0x63, 0xd5 },
 177         { 0x64, 0x57 },
 178         { 0x65, 0x83 },
 179         { 0x66, 0x55 },
 180         { 0x67, 0x92 },
 181         { 0x68, 0xcf },
 182         { 0x69, 0x76 },
 183         { 0x6a, 0x22 },
 184         { 0x6b, 0x00 },
 185         { 0x6c, 0x02 },
 186         { 0x6d, 0x44 },
 187         { 0x6e, 0x80 },
 188         { 0x6f, 0x1d },
 189         { 0x70, 0x8b },
 190         { 0x71, 0x00 },
 191         { 0x72, 0x14 },
 192         { 0x73, 0x54 },
 193         { 0x74, 0x00 },
 194         { 0x75, 0x8e },
 195         { 0x76, 0x00 },
 196         { 0x77, 0xff },
 197         { 0x78, 0x80 },
 198         { 0x79, 0x80 },
 199         { 0x7a, 0x80 },
 200         { 0x7b, 0xe2 },
 201         { 0x7c, 0x00 },
 202         { 0xff, 0xff }, /* END MARKER */
 203 };
 204
 205 /* Returns index into the specified look-up table, with 'n' elements, for which
 206  * the value is greater than or equal to "val". If a match isn't found, (n-1)
 207  * is returned. The entries in the table must be in ascending order. */
 208 static inline int ov7x20_lut_find(unsigned char lut[], int n, unsigned char val)
 209 {
 210         int i = 0;
 211
 212         while (lut[i] < val && i < n)
 213                 i++;
 214
 215         return i;
 216 }
 217
 218 /* This initializes the OV7x20 camera chip and relevant variables. */
 219 static int ov7x20_init(struct i2c_client *c)
 220 {
 221         struct ovcamchip *ov = i2c_get_clientdata(c);
 222         struct ov7x20 *s;
 223         int rc;
 224
 225         DDEBUG(4, &c->dev, "entered");
 226
 227         if (ov->mono)
 228                 rc = ov_write_regvals(c, regvals_init_7120);
 229         else
 230                 rc = ov_write_regvals(c, regvals_init_7620);
 231
 232         if (rc < 0)
 233                 return rc;
 234
 235         ov->spriv = s = kmalloc(sizeof *s, GFP_KERNEL);
 236         if (!s)
 237                 return -ENOMEM;
 238         memset(s, 0, sizeof *s);
 239
 240         s->auto_brt = 1;
 241         s->auto_exp = DFL_AUTO_EXP;
 242         s->auto_gain = DFL_AUTO_GAIN;
 243
 244         return 0;
 245 }
 246
 247 static int ov7x20_free(struct i2c_client *c)
 248 {
 249         struct ovcamchip *ov = i2c_get_clientdata(c);
 250
 251         kfree(ov->spriv);
 252         return 0;
 253 }
 254
 255 static int ov7x20_set_v4l1_control(struct i2c_client *c,
 256                                    struct ovcamchip_control *ctl)
 257 {
 258         struct ovcamchip *ov = i2c_get_clientdata(c);
 259         struct ov7x20 *s = ov->spriv;
 260         int rc;
 261         int v = ctl->value;
 262
 263         switch (ctl->id) {
 264         case OVCAMCHIP_CID_CONT:
 265         {
 266                 /* Use Y gamma control instead. Bit 0 enables it. */
 267                 rc = ov_write(c, 0x64, ctab[v >> 12]);
 268                 break;
 269         }
 270         case OVCAMCHIP_CID_BRIGHT:
 271                 /* 7620 doesn't like manual changes when in auto mode */
 272                 if (!s->auto_brt)
 273                         rc = ov_write(c, REG_BRT, v >> 8);
 274                 else
 275                         rc = 0;
 276                 break;
 277         case OVCAMCHIP_CID_SAT:
 278                 rc = ov_write(c, REG_SAT, v >> 8);
 279                 break;
 280         case OVCAMCHIP_CID_EXP:
 281                 if (!s->auto_exp)
 282                         rc = ov_write(c, REG_EXP, v);
 283                 else
 284                         rc = -EBUSY;
 285                 break;
 286         case OVCAMCHIP_CID_FREQ:
 287         {
 288                 int sixty = (v == 60);
 289
 290                 rc = ov_write_mask(c, 0x2a, sixty?0x00:0x80, 0x80);
 291                 if (rc < 0)
 292                         goto out;
 293
 294                 rc = ov_write(c, 0x2b, sixty?0x00:0xac);
 295                 if (rc < 0)
 296                         goto out;
 297
 298                 rc = ov_write_mask(c, 0x76, 0x01, 0x01);
 299                 break;
 300         }
 301         case OVCAMCHIP_CID_BANDFILT:
 302                 rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
 303                 s->bandfilt = v;
 304                 break;
 305         case OVCAMCHIP_CID_AUTOBRIGHT:
 306                 rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
 307                 s->auto_brt = v;
 308                 break;
 309         case OVCAMCHIP_CID_AUTOEXP:
 310                 rc = ov_write_mask(c, 0x13, v?0x01:0x00, 0x01);
 311                 s->auto_exp = v;
 312                 break;
 313         case OVCAMCHIP_CID_BACKLIGHT:
 314         {
 315                 rc = ov_write_mask(c, 0x68, v?0xe0:0xc0, 0xe0);
 316                 if (rc < 0)
 317                         goto out;
 318
 319                 rc = ov_write_mask(c, 0x29, v?0x08:0x00, 0x08);
 320                 if (rc < 0)
 321                         goto out;
 322
 323                 rc = ov_write_mask(c, 0x28, v?0x02:0x00, 0x02);
 324                 s->backlight = v;
 325                 break;
 326         }
 327         case OVCAMCHIP_CID_MIRROR:
 328                 rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
 329                 s->mirror = v;
 330                 break;
 331         default:
 332                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 333                 return -EPERM;
 334         }
 335
 336 out:
 337         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
 338         return rc;
 339 }
 340
 341 static int ov7x20_get_v4l1_control(struct i2c_client *c,
 342                                    struct ovcamchip_control *ctl)
 343 {
 344         struct ovcamchip *ov = i2c_get_clientdata(c);
 345         struct ov7x20 *s = ov->spriv;
 346         int rc = 0;
 347         unsigned char val = 0;
 348
 349         switch (ctl->id) {
 350         case OVCAMCHIP_CID_CONT:
 351                 rc = ov_read(c, 0x64, &val);
 352                 ctl->value = ov7x20_lut_find(ctab, 16, val) << 12;
 353                 break;
 354         case OVCAMCHIP_CID_BRIGHT:
 355                 rc = ov_read(c, REG_BRT, &val);
 356                 ctl->value = val << 8;
 357                 break;
 358         case OVCAMCHIP_CID_SAT:
 359                 rc = ov_read(c, REG_SAT, &val);
 360                 ctl->value = val << 8;
 361                 break;
 362         case OVCAMCHIP_CID_EXP:
 363                 rc = ov_read(c, REG_EXP, &val);
 364                 ctl->value = val;
 365                 break;
 366         case OVCAMCHIP_CID_BANDFILT:
 367                 ctl->value = s->bandfilt;
 368                 break;
 369         case OVCAMCHIP_CID_AUTOBRIGHT:
 370                 ctl->value = s->auto_brt;
 371                 break;
 372         case OVCAMCHIP_CID_AUTOEXP:
 373                 ctl->value = s->auto_exp;
 374                 break;
 375         case OVCAMCHIP_CID_BACKLIGHT:
 376                 ctl->value = s->backlight;
 377                 break;
 378         case OVCAMCHIP_CID_MIRROR:
 379                 ctl->value = s->mirror;
 380                 break;
 381         default:
 382                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 383                 return -EPERM;
 384         }
 385
 386         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
 387         return rc;
 388 }
 389
 390 static int ov7x20_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
 391 {
 392         struct ovcamchip *ov = i2c_get_clientdata(c);
 393         int qvga = win->quarter;
 394
 395         /******** QVGA-specific regs ********/
 396         ov_write_mask(c, 0x14, qvga?0x20:0x00, 0x20);
 397         ov_write_mask(c, 0x28, qvga?0x00:0x20, 0x20);
 398         ov_write(c, 0x24, qvga?0x20:0x3a);
 399         ov_write(c, 0x25, qvga?0x30:0x60);
 400         ov_write_mask(c, 0x2d, qvga?0x40:0x00, 0x40);
 401         if (!ov->mono)
 402                 ov_write_mask(c, 0x67, qvga?0xf0:0x90, 0xf0);
 403         ov_write_mask(c, 0x74, qvga?0x20:0x00, 0x20);
 404
 405         /******** Clock programming ********/
 406
 407         ov_write(c, 0x11, win->clockdiv);
 408
 409         return 0;
 410 }
 411
 412 static int ov7x20_set_window(struct i2c_client *c, struct ovcamchip_window *win)
 413 {
 414         int ret, hwscale, vwscale;
 415
 416         ret = ov7x20_mode_init(c, win);
 417         if (ret < 0)
 418                 return ret;
 419
 420         if (win->quarter) {
 421                 hwscale = 1;
 422                 vwscale = 0;
 423         } else {
 424                 hwscale = 2;
 425                 vwscale = 1;
 426         }
 427
 428         ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
 429         ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
 430         ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
 431         ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));
 432
 433         return 0;
 434 }
 435
 436 static int ov7x20_command(struct i2c_client *c, unsigned int cmd, void *arg)
 437 {
 438         switch (cmd) {
 439         case OVCAMCHIP_CMD_S_CTRL:
 440                 return ov7x20_set_v4l1_control(c, arg);
 441         case OVCAMCHIP_CMD_G_CTRL:
 442                 return ov7x20_get_v4l1_control(c, arg);
 443         case OVCAMCHIP_CMD_S_MODE:
 444                 return ov7x20_set_window(c, arg);
 445         default:
 446                 DDEBUG(2, &c->dev, "command not supported: %d", cmd);
 447                 return -ENOIOCTLCMD;
 448         }
 449 }
 450
 451 struct ovcamchip_ops ov7x20_ops = {
 452         .init    =      ov7x20_init,
 453         .free    =      ov7x20_free,
 454         .command =      ov7x20_command,
 455 };