drivers/media/video/ovcamchip/ov76be.c

   1 /* OmniVision OV76BE 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 /* OV7610 registers: Since the OV76BE is undocumented, we'll settle for these
  18  * for now. */
  19 #define REG_GAIN                0x00    /* gain [5:0] */
  20 #define REG_BLUE                0x01    /* blue channel balance */
  21 #define REG_RED                 0x02    /* red channel balance */
  22 #define REG_SAT                 0x03    /* saturation */
  23 #define REG_CNT                 0x05    /* Y contrast */
  24 #define REG_BRT                 0x06    /* Y brightness */
  25 #define REG_BLUE_BIAS           0x0C    /* blue channel bias [5:0] */
  26 #define REG_RED_BIAS            0x0D    /* red channel bias [5:0] */
  27 #define REG_GAMMA_COEFF         0x0E    /* gamma settings */
  28 #define REG_WB_RANGE            0x0F    /* AEC/ALC/S-AWB settings */
  29 #define REG_EXP                 0x10    /* manual exposure setting */
  30 #define REG_CLOCK               0x11    /* polarity/clock prescaler */
  31 #define REG_FIELD_DIVIDE        0x16    /* field interval/mode settings */
  32 #define REG_HWIN_START          0x17    /* horizontal window start */
  33 #define REG_HWIN_END            0x18    /* horizontal window end */
  34 #define REG_VWIN_START          0x19    /* vertical window start */
  35 #define REG_VWIN_END            0x1A    /* vertical window end */
  36 #define REG_PIXEL_SHIFT         0x1B    /* pixel shift */
  37 #define REG_YOFFSET             0x21    /* Y channel offset */
  38 #define REG_UOFFSET             0x22    /* U channel offset */
  39 #define REG_ECW                 0x24    /* exposure white level for AEC */
  40 #define REG_ECB                 0x25    /* exposure black level for AEC */
  41 #define REG_FRAMERATE_H         0x2A    /* frame rate MSB + misc */
  42 #define REG_FRAMERATE_L         0x2B    /* frame rate LSB */
  43 #define REG_ALC                 0x2C    /* Auto Level Control settings */
  44 #define REG_VOFFSET             0x2E    /* V channel offset adjustment */
  45 #define REG_ARRAY_BIAS          0x2F    /* array bias -- don't change */
  46 #define REG_YGAMMA              0x33    /* misc gamma settings [7:6] */
  47 #define REG_BIAS_ADJUST         0x34    /* misc bias settings */
  48
  49 /* Window parameters */
  50 #define HWSBASE 0x38
  51 #define HWEBASE 0x3a
  52 #define VWSBASE 0x05
  53 #define VWEBASE 0x05
  54
  55 struct ov76be {
  56         int auto_brt;
  57         int auto_exp;
  58         int bandfilt;
  59         int mirror;
  60 };
  61
  62 /* NOTE: These are the same as the 7x10 settings, but should eventually be
  63  * optimized for the OV76BE */
  64 static struct ovcamchip_regvals regvals_init_76be[] = {
  65         { 0x10, 0xff },
  66         { 0x16, 0x03 },
  67         { 0x28, 0x24 },
  68         { 0x2b, 0xac },
  69         { 0x12, 0x00 },
  70         { 0x38, 0x81 },
  71         { 0x28, 0x24 }, /* 0c */
  72         { 0x0f, 0x85 }, /* lg's setting */
  73         { 0x15, 0x01 },
  74         { 0x20, 0x1c },
  75         { 0x23, 0x2a },
  76         { 0x24, 0x10 },
  77         { 0x25, 0x8a },
  78         { 0x26, 0xa2 },
  79         { 0x27, 0xc2 },
  80         { 0x2a, 0x04 },
  81         { 0x2c, 0xfe },
  82         { 0x2d, 0x93 },
  83         { 0x30, 0x71 },
  84         { 0x31, 0x60 },
  85         { 0x32, 0x26 },
  86         { 0x33, 0x20 },
  87         { 0x34, 0x48 },
  88         { 0x12, 0x24 },
  89         { 0x11, 0x01 },
  90         { 0x0c, 0x24 },
  91         { 0x0d, 0x24 },
  92         { 0xff, 0xff }, /* END MARKER */
  93 };
  94
  95 /* This initializes the OV76be camera chip and relevant variables. */
  96 static int ov76be_init(struct i2c_client *c)
  97 {
  98         struct ovcamchip *ov = i2c_get_clientdata(c);
  99         struct ov76be *s;
 100         int rc;
 101
 102         DDEBUG(4, &c->dev, "entered");
 103
 104         rc = ov_write_regvals(c, regvals_init_76be);
 105         if (rc < 0)
 106                 return rc;
 107
 108         ov->spriv = s = kzalloc(sizeof *s, GFP_KERNEL);
 109         if (!s)
 110                 return -ENOMEM;
 111
 112         s->auto_brt = 1;
 113         s->auto_exp = 1;
 114
 115         return rc;
 116 }
 117
 118 static int ov76be_free(struct i2c_client *c)
 119 {
 120         struct ovcamchip *ov = i2c_get_clientdata(c);
 121
 122         kfree(ov->spriv);
 123         return 0;
 124 }
 125
 126 static int ov76be_set_control(struct i2c_client *c,
 127                               struct ovcamchip_control *ctl)
 128 {
 129         struct ovcamchip *ov = i2c_get_clientdata(c);
 130         struct ov76be *s = ov->spriv;
 131         int rc;
 132         int v = ctl->value;
 133
 134         switch (ctl->id) {
 135         case OVCAMCHIP_CID_BRIGHT:
 136                 rc = ov_write(c, REG_BRT, v >> 8);
 137                 break;
 138         case OVCAMCHIP_CID_SAT:
 139                 rc = ov_write(c, REG_SAT, v >> 8);
 140                 break;
 141         case OVCAMCHIP_CID_EXP:
 142                 rc = ov_write(c, REG_EXP, v);
 143                 break;
 144         case OVCAMCHIP_CID_FREQ:
 145         {
 146                 int sixty = (v == 60);
 147
 148                 rc = ov_write_mask(c, 0x2a, sixty?0x00:0x80, 0x80);
 149                 if (rc < 0)
 150                         goto out;
 151
 152                 rc = ov_write(c, 0x2b, sixty?0x00:0xac);
 153                 if (rc < 0)
 154                         goto out;
 155
 156                 rc = ov_write_mask(c, 0x76, 0x01, 0x01);
 157                 break;
 158         }
 159         case OVCAMCHIP_CID_BANDFILT:
 160                 rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
 161                 s->bandfilt = v;
 162                 break;
 163         case OVCAMCHIP_CID_AUTOBRIGHT:
 164                 rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
 165                 s->auto_brt = v;
 166                 break;
 167         case OVCAMCHIP_CID_AUTOEXP:
 168                 rc = ov_write_mask(c, 0x13, v?0x01:0x00, 0x01);
 169                 s->auto_exp = v;
 170                 break;
 171         case OVCAMCHIP_CID_MIRROR:
 172                 rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
 173                 s->mirror = v;
 174                 break;
 175         default:
 176                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 177                 return -EPERM;
 178         }
 179
 180 out:
 181         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
 182         return rc;
 183 }
 184
 185 static int ov76be_get_control(struct i2c_client *c,
 186                               struct ovcamchip_control *ctl)
 187 {
 188         struct ovcamchip *ov = i2c_get_clientdata(c);
 189         struct ov76be *s = ov->spriv;
 190         int rc = 0;
 191         unsigned char val = 0;
 192
 193         switch (ctl->id) {
 194         case OVCAMCHIP_CID_BRIGHT:
 195                 rc = ov_read(c, REG_BRT, &val);
 196                 ctl->value = val << 8;
 197                 break;
 198         case OVCAMCHIP_CID_SAT:
 199                 rc = ov_read(c, REG_SAT, &val);
 200                 ctl->value = val << 8;
 201                 break;
 202         case OVCAMCHIP_CID_EXP:
 203                 rc = ov_read(c, REG_EXP, &val);
 204                 ctl->value = val;
 205                 break;
 206         case OVCAMCHIP_CID_BANDFILT:
 207                 ctl->value = s->bandfilt;
 208                 break;
 209         case OVCAMCHIP_CID_AUTOBRIGHT:
 210                 ctl->value = s->auto_brt;
 211                 break;
 212         case OVCAMCHIP_CID_AUTOEXP:
 213                 ctl->value = s->auto_exp;
 214                 break;
 215         case OVCAMCHIP_CID_MIRROR:
 216                 ctl->value = s->mirror;
 217                 break;
 218         default:
 219                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 220                 return -EPERM;
 221         }
 222
 223         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
 224         return rc;
 225 }
 226
 227 static int ov76be_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
 228 {
 229         int qvga = win->quarter;
 230
 231         /******** QVGA-specific regs ********/
 232
 233         ov_write(c, 0x14, qvga?0xa4:0x84);
 234
 235         /******** Palette-specific regs ********/
 236
 237         if (win->format == VIDEO_PALETTE_GREY) {
 238                 ov_write_mask(c, 0x0e, 0x40, 0x40);
 239                 ov_write_mask(c, 0x13, 0x20, 0x20);
 240         } else {
 241                 ov_write_mask(c, 0x0e, 0x00, 0x40);
 242                 ov_write_mask(c, 0x13, 0x00, 0x20);
 243         }
 244
 245         /******** Clock programming ********/
 246
 247         ov_write(c, 0x11, win->clockdiv);
 248
 249         /******** Resolution-specific ********/
 250
 251         if (win->width == 640 && win->height == 480)
 252                 ov_write(c, 0x35, 0x9e);
 253         else
 254                 ov_write(c, 0x35, 0x1e);
 255
 256         return 0;
 257 }
 258
 259 static int ov76be_set_window(struct i2c_client *c, struct ovcamchip_window *win)
 260 {
 261         int ret, hwscale, vwscale;
 262
 263         ret = ov76be_mode_init(c, win);
 264         if (ret < 0)
 265                 return ret;
 266
 267         if (win->quarter) {
 268                 hwscale = 1;
 269                 vwscale = 0;
 270         } else {
 271                 hwscale = 2;
 272                 vwscale = 1;
 273         }
 274
 275         ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
 276         ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
 277         ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
 278         ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));
 279
 280         return 0;
 281 }
 282
 283 static int ov76be_command(struct i2c_client *c, unsigned int cmd, void *arg)
 284 {
 285         switch (cmd) {
 286         case OVCAMCHIP_CMD_S_CTRL:
 287                 return ov76be_set_control(c, arg);
 288         case OVCAMCHIP_CMD_G_CTRL:
 289                 return ov76be_get_control(c, arg);
 290         case OVCAMCHIP_CMD_S_MODE:
 291                 return ov76be_set_window(c, arg);
 292         default:
 293                 DDEBUG(2, &c->dev, "command not supported: %d", cmd);
 294                 return -ENOIOCTLCMD;
 295         }
 296 }
 297
 298 struct ovcamchip_ops ov76be_ops = {
 299         .init    =      ov76be_init,
 300         .free    =      ov76be_free,
 301         .command =      ov76be_command,
 302 };