drivers/media/video/ovcamchip/ov7x10.c

   1 /* OmniVision OV7610/OV7110 Camera Chip Support Code
   2  *
   3  * Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
   4  * http://alpha.dyndns.org/ov511/
   5  *
   6  * Color fixes by by Orion Sky Lawlor <olawlor@acm.org> (2/26/2000)
   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 channel balance */
  22 #define REG_RED                 0x02    /* red channel balance */
  23 #define REG_SAT                 0x03    /* saturation */
  24 #define REG_CNT                 0x05    /* Y contrast */
  25 #define REG_BRT                 0x06    /* Y brightness */
  26 #define REG_BLUE_BIAS           0x0C    /* blue channel bias [5:0] */
  27 #define REG_RED_BIAS            0x0D    /* red channel bias [5:0] */
  28 #define REG_GAMMA_COEFF         0x0E    /* gamma settings */
  29 #define REG_WB_RANGE            0x0F    /* AEC/ALC/S-AWB settings */
  30 #define REG_EXP                 0x10    /* manual exposure setting */
  31 #define REG_CLOCK               0x11    /* polarity/clock prescaler */
  32 #define REG_FIELD_DIVIDE        0x16    /* field interval/mode settings */
  33 #define REG_HWIN_START          0x17    /* horizontal window start */
  34 #define REG_HWIN_END            0x18    /* horizontal window end */
  35 #define REG_VWIN_START          0x19    /* vertical window start */
  36 #define REG_VWIN_END            0x1A    /* vertical window end */
  37 #define REG_PIXEL_SHIFT         0x1B    /* pixel shift */
  38 #define REG_YOFFSET             0x21    /* Y channel offset */
  39 #define REG_UOFFSET             0x22    /* U channel offset */
  40 #define REG_ECW                 0x24    /* exposure white level for AEC */
  41 #define REG_ECB                 0x25    /* exposure black level for AEC */
  42 #define REG_FRAMERATE_H         0x2A    /* frame rate MSB + misc */
  43 #define REG_FRAMERATE_L         0x2B    /* frame rate LSB */
  44 #define REG_ALC                 0x2C    /* Auto Level Control settings */
  45 #define REG_VOFFSET             0x2E    /* V channel offset adjustment */
  46 #define REG_ARRAY_BIAS          0x2F    /* array bias -- don't change */
  47 #define REG_YGAMMA              0x33    /* misc gamma settings [7:6] */
  48 #define REG_BIAS_ADJUST         0x34    /* misc bias settings */
  49
  50 /* Window parameters */
  51 #define HWSBASE 0x38
  52 #define HWEBASE 0x3a
  53 #define VWSBASE 0x05
  54 #define VWEBASE 0x05
  55
  56 struct ov7x10 {
  57         int auto_brt;
  58         int auto_exp;
  59         int bandfilt;
  60         int mirror;
  61 };
  62
  63 /* Lawrence Glaister <lg@jfm.bc.ca> reports:
  64  *
  65  * Register 0x0f in the 7610 has the following effects:
  66  *
  67  * 0x85 (AEC method 1): Best overall, good contrast range
  68  * 0x45 (AEC method 2): Very overexposed
  69  * 0xa5 (spec sheet default): Ok, but the black level is
  70  *      shifted resulting in loss of contrast
  71  * 0x05 (old driver setting): very overexposed, too much
  72  *      contrast
  73  */
  74 static struct ovcamchip_regvals regvals_init_7x10[] = {
  75         { 0x10, 0xff },
  76         { 0x16, 0x03 },
  77         { 0x28, 0x24 },
  78         { 0x2b, 0xac },
  79         { 0x12, 0x00 },
  80         { 0x38, 0x81 },
  81         { 0x28, 0x24 }, /* 0c */
  82         { 0x0f, 0x85 }, /* lg's setting */
  83         { 0x15, 0x01 },
  84         { 0x20, 0x1c },
  85         { 0x23, 0x2a },
  86         { 0x24, 0x10 },
  87         { 0x25, 0x8a },
  88         { 0x26, 0xa2 },
  89         { 0x27, 0xc2 },
  90         { 0x2a, 0x04 },
  91         { 0x2c, 0xfe },
  92         { 0x2d, 0x93 },
  93         { 0x30, 0x71 },
  94         { 0x31, 0x60 },
  95         { 0x32, 0x26 },
  96         { 0x33, 0x20 },
  97         { 0x34, 0x48 },
  98         { 0x12, 0x24 },
  99         { 0x11, 0x01 },
 100         { 0x0c, 0x24 },
 101         { 0x0d, 0x24 },
 102         { 0xff, 0xff }, /* END MARKER */
 103 };
 104
 105 /* This initializes the OV7x10 camera chip and relevant variables. */
 106 static int ov7x10_init(struct i2c_client *c)
 107 {
 108         struct ovcamchip *ov = i2c_get_clientdata(c);
 109         struct ov7x10 *s;
 110         int rc;
 111
 112         DDEBUG(4, &c->dev, "entered");
 113
 114         rc = ov_write_regvals(c, regvals_init_7x10);
 115         if (rc < 0)
 116                 return rc;
 117
 118         ov->spriv = s = kmalloc(sizeof *s, GFP_KERNEL);
 119         if (!s)
 120                 return -ENOMEM;
 121         memset(s, 0, sizeof *s);
 122
 123         s->auto_brt = 1;
 124         s->auto_exp = 1;
 125
 126         return rc;
 127 }
 128
 129 static int ov7x10_free(struct i2c_client *c)
 130 {
 131         struct ovcamchip *ov = i2c_get_clientdata(c);
 132
 133         kfree(ov->spriv);
 134         return 0;
 135 }
 136
 137 static int ov7x10_set_control(struct i2c_client *c,
 138                               struct ovcamchip_control *ctl)
 139 {
 140         struct ovcamchip *ov = i2c_get_clientdata(c);
 141         struct ov7x10 *s = ov->spriv;
 142         int rc;
 143         int v = ctl->value;
 144
 145         switch (ctl->id) {
 146         case OVCAMCHIP_CID_CONT:
 147                 rc = ov_write(c, REG_CNT, v >> 8);
 148                 break;
 149         case OVCAMCHIP_CID_BRIGHT:
 150                 rc = ov_write(c, REG_BRT, v >> 8);
 151                 break;
 152         case OVCAMCHIP_CID_SAT:
 153                 rc = ov_write(c, REG_SAT, v >> 8);
 154                 break;
 155         case OVCAMCHIP_CID_HUE:
 156                 rc = ov_write(c, REG_RED, 0xFF - (v >> 8));
 157                 if (rc < 0)
 158                         goto out;
 159
 160                 rc = ov_write(c, REG_BLUE, v >> 8);
 161                 break;
 162         case OVCAMCHIP_CID_EXP:
 163                 rc = ov_write(c, REG_EXP, v);
 164                 break;
 165         case OVCAMCHIP_CID_FREQ:
 166         {
 167                 int sixty = (v == 60);
 168
 169                 rc = ov_write_mask(c, 0x2a, sixty?0x00:0x80, 0x80);
 170                 if (rc < 0)
 171                         goto out;
 172
 173                 rc = ov_write(c, 0x2b, sixty?0x00:0xac);
 174                 if (rc < 0)
 175                         goto out;
 176
 177                 rc = ov_write_mask(c, 0x13, 0x10, 0x10);
 178                 if (rc < 0)
 179                         goto out;
 180
 181                 rc = ov_write_mask(c, 0x13, 0x00, 0x10);
 182                 break;
 183         }
 184         case OVCAMCHIP_CID_BANDFILT:
 185                 rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
 186                 s->bandfilt = v;
 187                 break;
 188         case OVCAMCHIP_CID_AUTOBRIGHT:
 189                 rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
 190                 s->auto_brt = v;
 191                 break;
 192         case OVCAMCHIP_CID_AUTOEXP:
 193                 rc = ov_write_mask(c, 0x29, v?0x00:0x80, 0x80);
 194                 s->auto_exp = v;
 195                 break;
 196         case OVCAMCHIP_CID_MIRROR:
 197                 rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
 198                 s->mirror = v;
 199                 break;
 200         default:
 201                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 202                 return -EPERM;
 203         }
 204
 205 out:
 206         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
 207         return rc;
 208 }
 209
 210 static int ov7x10_get_control(struct i2c_client *c,
 211                               struct ovcamchip_control *ctl)
 212 {
 213         struct ovcamchip *ov = i2c_get_clientdata(c);
 214         struct ov7x10 *s = ov->spriv;
 215         int rc = 0;
 216         unsigned char val = 0;
 217
 218         switch (ctl->id) {
 219         case OVCAMCHIP_CID_CONT:
 220                 rc = ov_read(c, REG_CNT, &val);
 221                 ctl->value = val << 8;
 222                 break;
 223         case OVCAMCHIP_CID_BRIGHT:
 224                 rc = ov_read(c, REG_BRT, &val);
 225                 ctl->value = val << 8;
 226                 break;
 227         case OVCAMCHIP_CID_SAT:
 228                 rc = ov_read(c, REG_SAT, &val);
 229                 ctl->value = val << 8;
 230                 break;
 231         case OVCAMCHIP_CID_HUE:
 232                 rc = ov_read(c, REG_BLUE, &val);
 233                 ctl->value = val << 8;
 234                 break;
 235         case OVCAMCHIP_CID_EXP:
 236                 rc = ov_read(c, REG_EXP, &val);
 237                 ctl->value = val;
 238                 break;
 239         case OVCAMCHIP_CID_BANDFILT:
 240                 ctl->value = s->bandfilt;
 241                 break;
 242         case OVCAMCHIP_CID_AUTOBRIGHT:
 243                 ctl->value = s->auto_brt;
 244                 break;
 245         case OVCAMCHIP_CID_AUTOEXP:
 246                 ctl->value = s->auto_exp;
 247                 break;
 248         case OVCAMCHIP_CID_MIRROR:
 249                 ctl->value = s->mirror;
 250                 break;
 251         default:
 252                 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
 253                 return -EPERM;
 254         }
 255
 256         DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
 257         return rc;
 258 }
 259
 260 static int ov7x10_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
 261 {
 262         int qvga = win->quarter;
 263
 264         /******** QVGA-specific regs ********/
 265
 266         ov_write(c, 0x14, qvga?0x24:0x04);
 267
 268         /******** Palette-specific regs ********/
 269
 270         if (win->format == VIDEO_PALETTE_GREY) {
 271                 ov_write_mask(c, 0x0e, 0x40, 0x40);
 272                 ov_write_mask(c, 0x13, 0x20, 0x20);
 273         } else {
 274                 ov_write_mask(c, 0x0e, 0x00, 0x40);
 275                 ov_write_mask(c, 0x13, 0x00, 0x20);
 276         }
 277
 278         /******** Clock programming ********/
 279
 280         ov_write(c, 0x11, win->clockdiv);
 281
 282         /******** Resolution-specific ********/
 283
 284         if (win->width == 640 && win->height == 480)
 285                 ov_write(c, 0x35, 0x9e);
 286         else
 287                 ov_write(c, 0x35, 0x1e);
 288
 289         return 0;
 290 }
 291
 292 static int ov7x10_set_window(struct i2c_client *c, struct ovcamchip_window *win)
 293 {
 294         int ret, hwscale, vwscale;
 295
 296         ret = ov7x10_mode_init(c, win);
 297         if (ret < 0)
 298                 return ret;
 299
 300         if (win->quarter) {
 301                 hwscale = 1;
 302                 vwscale = 0;
 303         } else {
 304                 hwscale = 2;
 305                 vwscale = 1;
 306         }
 307
 308         ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
 309         ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
 310         ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
 311         ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));
 312
 313         return 0;
 314 }
 315
 316 static int ov7x10_command(struct i2c_client *c, unsigned int cmd, void *arg)
 317 {
 318         switch (cmd) {
 319         case OVCAMCHIP_CMD_S_CTRL:
 320                 return ov7x10_set_control(c, arg);
 321         case OVCAMCHIP_CMD_G_CTRL:
 322                 return ov7x10_get_control(c, arg);
 323         case OVCAMCHIP_CMD_S_MODE:
 324                 return ov7x10_set_window(c, arg);
 325         default:
 326                 DDEBUG(2, &c->dev, "command not supported: %d", cmd);
 327                 return -ENOIOCTLCMD;
 328         }
 329 }
 330
 331 struct ovcamchip_ops ov7x10_ops = {
 332         .init    =      ov7x10_init,
 333         .free    =      ov7x10_free,
 334         .command =      ov7x10_command,
 335 };