/* OmniVision OV7620/OV7120 Camera Chip Support Code
*
* Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
* http://alpha.dyndns.org/ov511/
*
* OV7620 fixes by Charl P. Botha <cpbotha@ieee.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. NO WARRANTY OF ANY KIND is expressed or implied.
*/
#define DEBUG
#include <linux/slab.h>
#include "ovcamchip_priv.h"
/* Registers */
#define REG_GAIN 0x00 /* gain [5:0] */
#define REG_BLUE 0x01 /* blue gain */
#define REG_RED 0x02 /* red gain */
#define REG_SAT 0x03 /* saturation */
#define REG_BRT 0x06 /* Y brightness */
#define REG_SHARP 0x07 /* analog sharpness */
#define REG_BLUE_BIAS 0x0C /* WB blue ratio [5:0] */
#define REG_RED_BIAS 0x0D /* WB red ratio [5:0] */
#define REG_EXP 0x10 /* exposure */
/* Default control settings. Values are in terms of V4L2 controls. */
#define OV7120_DFL_BRIGHT 0x60
#define OV7620_DFL_BRIGHT 0x60
#define OV7120_DFL_SAT 0xb0
#define OV7620_DFL_SAT 0xc0
#define DFL_AUTO_EXP 1
#define DFL_AUTO_GAIN 1
#define OV7120_DFL_GAIN 0x00
#define OV7620_DFL_GAIN 0x00
/* NOTE: Since autoexposure is the default, these aren't programmed into the
* OV7x20 chip. They are just here because V4L2 expects a default */
#define OV7120_DFL_EXP 0x7f
#define OV7620_DFL_EXP 0x7f
/* Window parameters */
#define HWSBASE 0x2F /* From 7620.SET (spec is wrong) */
#define HWEBASE 0x2F
#define VWSBASE 0x05
#define VWEBASE 0x05
struct ov7x20 {
int auto_brt;
int auto_exp;
int auto_gain;
int backlight;
int bandfilt;
int mirror;
};
/* Contrast look-up table */
static unsigned char ctab[] = {
0x01, 0x05, 0x09, 0x11, 0x15, 0x35, 0x37, 0x57,
0x5b, 0xa5, 0xa7, 0xc7, 0xc9, 0xcf, 0xef, 0xff
};
/* Settings for (Black & White) OV7120 camera chip */
static struct ovcamchip_regvals regvals_init_7120[] = {
{ 0x12, 0x80 }, /* reset */
{ 0x13, 0x00 }, /* Autoadjust off */
{ 0x12, 0x20 }, /* Disable AWB */
{ 0x13, DFL_AUTO_GAIN?0x01:0x00 }, /* Autoadjust on (if desired) */
{ 0x00, OV7120_DFL_GAIN },
{ 0x01, 0x80 },
{ 0x02, 0x80 },
{ 0x03, OV7120_DFL_SAT },
{ 0x06, OV7120_DFL_BRIGHT },
{ 0x07, 0x00 },
{ 0x0c, 0x20 },
{ 0x0d, 0x20 },
{ 0x11, 0x01 },
{ 0x14, 0x84 },
{ 0x15, 0x01 },
{ 0x16, 0x03 },
{ 0x17, 0x2f },
{ 0x18, 0xcf },
{ 0x19, 0x06 },
{ 0x1a, 0xf5 },
{ 0x1b, 0x00 },
{ 0x20, 0x08 },
{ 0x21, 0x80 },
{ 0x22, 0x80 },
{ 0x23, 0x00 },
{ 0x26, 0xa0 },
{ 0x27, 0xfa },
{ 0x28, 0x20 }, /* DON'T set bit 6. It is for the OV7620 only */
{ 0x29, DFL_AUTO_EXP?0x00:0x80 },
{ 0x2a, 0x10 },
{ 0x2b, 0x00 },
{ 0x2c, 0x88 },
{ 0x2d, 0x95 },
{ 0x2e, 0x80 },
{ 0x2f, 0x44 },
{ 0x60, 0x20 },
{ 0x61, 0x02 },
{ 0x62, 0x5f },
{ 0x63, 0xd5 },
{ 0x64, 0x57 },
{ 0x65, 0x83 }, /* OV says "don't change this value" */
{ 0x66, 0x55 },
{ 0x67, 0x92 },
{ 0x68, 0xcf },
{ 0x69, 0x76 },
{ 0x6a, 0x22 },
{ 0x6b, 0xe2 },
{ 0x6c, 0x40 },
{ 0x6d, 0x48 },
{ 0x6e, 0x80 },
{ 0x6f, 0x0d },
{ 0x70, 0x89 },
{ 0x71, 0x00 },
{ 0x72, 0x14 },
{ 0x73, 0x54 },
{ 0x74, 0xa0 },
{ 0x75, 0x8e },
{ 0x76, 0x00 },
{ 0x77, 0xff },
{ 0x78, 0x80 },
{ 0x79, 0x80 },
{ 0x7a, 0x80 },
{ 0x7b, 0xe6 },
{ 0x7c, 0x00 },
{ 0x24, 0x3a },
{ 0x25, 0x60 },
{ 0xff, 0xff }, /* END MARKER */
};
/* Settings for (color) OV7620 camera chip */
static struct ovcamchip_regvals regvals_init_7620[] = {
{ 0x12, 0x80 }, /* reset */
{ 0x00, OV7620_DFL_GAIN },
{ 0x01, 0x80 },
{ 0x02, 0x80 },
{ 0x03, OV7620_DFL_SAT },
{ 0x06, OV7620_DFL_BRIGHT },
{ 0x07, 0x00 },
{ 0x0c, 0x24 },
{ 0x0c, 0x24 },
{ 0x0d, 0x24 },
{ 0x11, 0x01 },
{ 0x12, 0x24 },
{ 0x13, DFL_AUTO_GAIN?0x01:0x00 },
{ 0x14, 0x84 },
{ 0x15, 0x01 },
{ 0x16, 0x03 },
{ 0x17, 0x2f },
{ 0x18, 0xcf },
{ 0x19, 0x06 },
{ 0x1a, 0xf5 },
{ 0x1b, 0x00 },
{ 0x20, 0x18 },
{ 0x21, 0x80 },
{ 0x22, 0x80 },
{ 0x23, 0x00 },
{ 0x26, 0xa2 },
{ 0x27, 0xea },
{ 0x28, 0x20 },
{ 0x29, DFL_AUTO_EXP?0x00:0x80 },
{ 0x2a, 0x10 },
{ 0x2b, 0x00 },
{ 0x2c, 0x88 },
{ 0x2d, 0x91 },
{ 0x2e, 0x80 },
{ 0x2f, 0x44 },
{ 0x60, 0x27 },
{ 0x61, 0x02 },
{ 0x62, 0x5f },
{ 0x63, 0xd5 },
{ 0x64, 0x57 },
{ 0x65, 0x83 },
{ 0x66, 0x55 },
{ 0x67, 0x92 },
{ 0x68, 0xcf },
{ 0x69, 0x76 },
{ 0x6a, 0x22 },
{ 0x6b, 0x00 },
{ 0x6c, 0x02 },
{ 0x6d, 0x44 },
{ 0x6e, 0x80 },
{ 0x6f, 0x1d },
{ 0x70, 0x8b },
{ 0x71, 0x00 },
{ 0x72, 0x14 },
{ 0x73, 0x54 },
{ 0x74, 0x00 },
{ 0x75, 0x8e },
{ 0x76, 0x00 },
{ 0x77, 0xff },
{ 0x78, 0x80 },
{ 0x79, 0x80 },
{ 0x7a, 0x80 },
{ 0x7b, 0xe2 },
{ 0x7c, 0x00 },
{ 0xff, 0xff }, /* END MARKER */
};
/* Returns index into the specified look-up table, with 'n' elements, for which
* the value is greater than or equal to "val". If a match isn't found, (n-1)
* is returned. The entries in the table must be in ascending order. */
static inline int ov7x20_lut_find(unsigned char lut[], int n, unsigned char val)
{
int i = 0;
while (lut[i] < val && i < n)
i++;
return i;
}
/* This initializes the OV7x20 camera chip and relevant variables. */
static int ov7x20_init(struct i2c_client *c)
{
struct ovcamchip *ov = i2c_get_clientdata(c);
struct ov7x20 *s;
int rc;
DDEBUG(4, &c->dev, "entered");
if (ov->mono)
rc = ov_write_regvals(c, regvals_init_7120);
else
rc = ov_write_regvals(c, regvals_init_7620);
if (rc < 0)
return rc;
ov->spriv = s = kzalloc(sizeof *s, GFP_KERNEL);
if (!s)
return -ENOMEM;
s->auto_brt = 1;
s->auto_exp = DFL_AUTO_EXP;
s->auto_gain = DFL_AUTO_GAIN;
return 0;
}
static int ov7x20_free(struct i2c_client *c)
{
struct ovcamchip *ov = i2c_get_clientdata(c);
kfree(ov->spriv);
return 0;
}
static int ov7x20_set_v4l1_control(struct i2c_client *c,
struct ovcamchip_control *ctl)
{
struct ovcamchip *ov = i2c_get_clientdata(c);
struct ov7x20 *s = ov->spriv;
int rc;
int v = ctl->value;
switch (ctl->id) {
case OVCAMCHIP_CID_CONT:
{
/* Use Y gamma control instead. Bit 0 enables it. */
rc = ov_write(c, 0x64, ctab[v >> 12]);
break;
}
case OVCAMCHIP_CID_BRIGHT:
/* 7620 doesn't like manual changes when in auto mode */
if (!s->auto_brt)
rc = ov_write(c, REG_BRT, v >> 8);
else
rc = 0;
break;
case OVCAMCHIP_CID_SAT:
rc = ov_write(c, REG_SAT, v >> 8);
break;
case OVCAMCHIP_CID_EXP:
if (!s->auto_exp)
rc = ov_write(c, REG_EXP, v);
else
rc = -EBUSY;
break;
case OVCAMCHIP_CID_FREQ:
{
int sixty = (v == 60);
rc = ov_write_mask(c, 0x2a, sixty?0x00:0x80, 0x80);
if (rc < 0)
goto out;
rc = ov_write(c, 0x2b, sixty?0x00:0xac);
if (rc < 0)
goto out;
rc = ov_write_mask(c, 0x76, 0x01, 0x01);
break;
}
case OVCAMCHIP_CID_BANDFILT:
rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
s->bandfilt = v;
break;
case OVCAMCHIP_CID_AUTOBRIGHT:
rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
s->auto_brt = v;
break;
case OVCAMCHIP_CID_AUTOEXP:
rc = ov_write_mask(c, 0x13, v?0x01:0x00, 0x01);
s->auto_exp = v;
break;
case OVCAMCHIP_CID_BACKLIGHT:
{
rc = ov_write_mask(c, 0x68, v?0xe0:0xc0, 0xe0);
if (rc < 0)
goto out;
rc = ov_write_mask(c, 0x29, v?0x08:0x00, 0x08);
if (rc < 0)
goto out;
rc = ov_write_mask(c, 0x28, v?0x02:0x00, 0x02);
s->backlight = v;
break;
}
case OVCAMCHIP_CID_MIRROR:
rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
s->mirror = v;
break;
default:
DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
return -EPERM;
}
out:
DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
return rc;
}
static int ov7x20_get_v4l1_control(struct i2c_client *c,
struct ovcamchip_control *ctl)
{
struct ovcamchip *ov = i2c_get_clientdata(c);
struct ov7x20 *s = ov->spriv;
int rc = 0;
unsigned char val = 0;
switch (ctl->id) {
case OVCAMCHIP_CID_CONT:
rc = ov_read(c, 0x64, &val);
ctl->value = ov7x20_lut_find(ctab, 16, val) << 12;
break;
case OVCAMCHIP_CID_BRIGHT:
rc = ov_read(c, REG_BRT, &val);
ctl->value = val << 8;
break;
case OVCAMCHIP_CID_SAT:
rc = ov_read(c, REG_SAT, &val);
ctl->value = val << 8;
break;
case OVCAMCHIP_CID_EXP:
rc = ov_read(c, REG_EXP, &val);
ctl->value = val;
break;
case OVCAMCHIP_CID_BANDFILT:
ctl->value = s->bandfilt;
break;
case OVCAMCHIP_CID_AUTOBRIGHT:
ctl->value = s->auto_brt;
break;
case OVCAMCHIP_CID_AUTOEXP:
ctl->value = s->auto_exp;
break;
case OVCAMCHIP_CID_BACKLIGHT:
ctl->value = s->backlight;
break;
case OVCAMCHIP_CID_MIRROR:
ctl->value = s->mirror;
break;
default:
DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
return -EPERM;
}
DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
return rc;
}
static int ov7x20_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
{
struct ovcamchip *ov = i2c_get_clientdata(c);
int qvga = win->quarter;
/******** QVGA-specific regs ********/
ov_write_mask(c, 0x14, qvga?0x20:0x00, 0x20);
ov_write_mask(c, 0x28, qvga?0x00:0x20, 0x20);
ov_write(c, 0x24, qvga?0x20:0x3a);
ov_write(c, 0x25, qvga?0x30:0x60);
ov_write_mask(c, 0x2d, qvga?0x40:0x00, 0x40);
if (!ov->mono)
ov_write_mask(c, 0x67, qvga?0xf0:0x90, 0xf0);
ov_write_mask(c, 0x74, qvga?0x20:0x00, 0x20);
/******** Clock programming ********/
ov_write(c, 0x11, win->clockdiv);
return 0;
}
static int ov7x20_set_window(struct i2c_client *c, struct ovcamchip_window *win)
{
int ret, hwscale, vwscale;
ret = ov7x20_mode_init(c, win);
if (ret < 0)
return ret;
if (win->quarter) {
hwscale = 1;
vwscale = 0;
} else {
hwscale = 2;
vwscale = 1;
}
ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));
return 0;
}
static int ov7x20_command(struct i2c_client *c, unsigned int cmd, void *arg)
{
switch (cmd) {
case OVCAMCHIP_CMD_S_CTRL:
return ov7x20_set_v4l1_control(c, arg);
case OVCAMCHIP_CMD_G_CTRL:
return ov7x20_get_v4l1_control(c, arg);
case OVCAMCHIP_CMD_S_MODE:
return ov7x20_set_window(c, arg);
default:
DDEBUG(2, &c->dev, "command not supported: %d", cmd);
return -ENOIOCTLCMD;
}
}
struct ovcamchip_ops ov7x20_ops = {
.init = ov7x20_init,
.free = ov7x20_free,
.command = ov7x20_command,
};
