/* 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 0x05struct 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 = kmalloc(sizeof *s, GFP_KERNEL);	if (!s)		return -ENOMEM;	memset(s, 0, sizeof *s);	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,};