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