drivers/media/video/ovcamchip/ov6x20.c - maze/linux - Git at Google

 /* OmniVision OV6620/OV6120 Camera Chip Support Code
  *
  * Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
  * http://alpha.dyndns.org/ov511/
  *
  * 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_CNT			0x05	/* Y contrast */
 #define REG_BRT			0x06	/* Y brightness */
 #define REG_WB_BLUE		0x0C	/* WB blue ratio [5:0] */
 #define REG_WB_RED		0x0D	/* WB red ratio [5:0] */
 #define REG_EXP			0x10	/* exposure */

 /* Window parameters */
 #define HWSBASE 0x38
 #define HWEBASE 0x3A
 #define VWSBASE 0x05
 #define VWEBASE 0x06

 struct ov6x20 {
 	int auto_brt;
 	int auto_exp;
 	int backlight;
 	int bandfilt;
 	int mirror;
 };

 /* Initial values for use with OV511/OV511+ cameras */
 static struct ovcamchip_regvals regvals_init_6x20_511[] = {
 	{ 0x12, 0x80 }, /* reset */
 	{ 0x11, 0x01 },
 	{ 0x03, 0x60 },
 	{ 0x05, 0x7f }, /* For when autoadjust is off */
 	{ 0x07, 0xa8 },
 	{ 0x0c, 0x24 },
 	{ 0x0d, 0x24 },
 	{ 0x0f, 0x15 }, /* COMS */
 	{ 0x10, 0x75 }, /* AEC Exposure time */
 	{ 0x12, 0x24 }, /* Enable AGC and AWB */
 	{ 0x14, 0x04 },
 	{ 0x16, 0x03 },
 	{ 0x26, 0xb2 }, /* BLC enable */
 	/* 0x28: 0x05 Selects RGB format if RGB on */
 	{ 0x28, 0x05 },
 	{ 0x2a, 0x04 }, /* Disable framerate adjust */
 	{ 0x2d, 0x99 },
 	{ 0x33, 0xa0 }, /* Color Processing Parameter */
 	{ 0x34, 0xd2 }, /* Max A/D range */
 	{ 0x38, 0x8b },
 	{ 0x39, 0x40 },

 	{ 0x3c, 0x39 }, /* Enable AEC mode changing */
 	{ 0x3c, 0x3c }, /* Change AEC mode */
 	{ 0x3c, 0x24 }, /* Disable AEC mode changing */

 	{ 0x3d, 0x80 },
 	/* These next two registers (0x4a, 0x4b) are undocumented. They
 	 * control the color balance */
 	{ 0x4a, 0x80 },
 	{ 0x4b, 0x80 },
 	{ 0x4d, 0xd2 }, /* This reduces noise a bit */
 	{ 0x4e, 0xc1 },
 	{ 0x4f, 0x04 },
 	{ 0xff, 0xff },	/* END MARKER */
 };

 /* Initial values for use with OV518 cameras */
 static struct ovcamchip_regvals regvals_init_6x20_518[] = {
 	{ 0x12, 0x80 }, /* Do a reset */
 	{ 0x03, 0xc0 }, /* Saturation */
 	{ 0x05, 0x8a }, /* Contrast */
 	{ 0x0c, 0x24 }, /* AWB blue */
 	{ 0x0d, 0x24 }, /* AWB red */
 	{ 0x0e, 0x8d }, /* Additional 2x gain */
 	{ 0x0f, 0x25 }, /* Black expanding level = 1.3V */
 	{ 0x11, 0x01 }, /* Clock div. */
 	{ 0x12, 0x24 }, /* Enable AGC and AWB */
 	{ 0x13, 0x01 }, /* (default) */
 	{ 0x14, 0x80 }, /* Set reserved bit 7 */
 	{ 0x15, 0x01 }, /* (default) */
 	{ 0x16, 0x03 }, /* (default) */
 	{ 0x17, 0x38 }, /* (default) */
 	{ 0x18, 0xea }, /* (default) */
 	{ 0x19, 0x04 },
 	{ 0x1a, 0x93 },
 	{ 0x1b, 0x00 }, /* (default) */
 	{ 0x1e, 0xc4 }, /* (default) */
 	{ 0x1f, 0x04 }, /* (default) */
 	{ 0x20, 0x20 }, /* Enable 1st stage aperture correction */
 	{ 0x21, 0x10 }, /* Y offset */
 	{ 0x22, 0x88 }, /* U offset */
 	{ 0x23, 0xc0 }, /* Set XTAL power level */
 	{ 0x24, 0x53 }, /* AEC bright ratio */
 	{ 0x25, 0x7a }, /* AEC black ratio */
 	{ 0x26, 0xb2 }, /* BLC enable */
 	{ 0x27, 0xa2 }, /* Full output range */
 	{ 0x28, 0x01 }, /* (default) */
 	{ 0x29, 0x00 }, /* (default) */
 	{ 0x2a, 0x84 }, /* (default) */
 	{ 0x2b, 0xa8 }, /* Set custom frame rate */
 	{ 0x2c, 0xa0 }, /* (reserved) */
 	{ 0x2d, 0x95 }, /* Enable banding filter */
 	{ 0x2e, 0x88 }, /* V offset */
 	{ 0x33, 0x22 }, /* Luminance gamma on */
 	{ 0x34, 0xc7 }, /* A/D bias */
 	{ 0x36, 0x12 }, /* (reserved) */
 	{ 0x37, 0x63 }, /* (reserved) */
 	{ 0x38, 0x8b }, /* Quick AEC/AEB */
 	{ 0x39, 0x00 }, /* (default) */
 	{ 0x3a, 0x0f }, /* (default) */
 	{ 0x3b, 0x3c }, /* (default) */
 	{ 0x3c, 0x5c }, /* AEC controls */
 	{ 0x3d, 0x80 }, /* Drop 1 (bad) frame when AEC change */
 	{ 0x3e, 0x80 }, /* (default) */
 	{ 0x3f, 0x02 }, /* (default) */
 	{ 0x40, 0x10 }, /* (reserved) */
 	{ 0x41, 0x10 }, /* (reserved) */
 	{ 0x42, 0x00 }, /* (reserved) */
 	{ 0x43, 0x7f }, /* (reserved) */
 	{ 0x44, 0x80 }, /* (reserved) */
 	{ 0x45, 0x1c }, /* (reserved) */
 	{ 0x46, 0x1c }, /* (reserved) */
 	{ 0x47, 0x80 }, /* (reserved) */
 	{ 0x48, 0x5f }, /* (reserved) */
 	{ 0x49, 0x00 }, /* (reserved) */
 	{ 0x4a, 0x00 }, /* Color balance (undocumented) */
 	{ 0x4b, 0x80 }, /* Color balance (undocumented) */
 	{ 0x4c, 0x58 }, /* (reserved) */
 	{ 0x4d, 0xd2 }, /* U *= .938, V *= .838 */
 	{ 0x4e, 0xa0 }, /* (default) */
 	{ 0x4f, 0x04 }, /* UV 3-point average */
 	{ 0x50, 0xff }, /* (reserved) */
 	{ 0x51, 0x58 }, /* (reserved) */
 	{ 0x52, 0xc0 }, /* (reserved) */
 	{ 0x53, 0x42 }, /* (reserved) */
 	{ 0x27, 0xa6 }, /* Enable manual offset adj. (reg 21 & 22) */
 	{ 0x12, 0x20 },
 	{ 0x12, 0x24 },

 	{ 0xff, 0xff },	/* END MARKER */
 };

 /* This initializes the OV6x20 camera chip and relevant variables. */
 static int ov6x20_init(struct i2c_client *c)
 {
 	struct ovcamchip *ov = i2c_get_clientdata(c);
 	struct ov6x20 *s;
 	int rc;

 	DDEBUG(4, &c->dev, "entered");

 	switch (c->adapter->id) {
 	case I2C_ALGO_SMBUS | I2C_HW_SMBUS_OV511:
 		rc = ov_write_regvals(c, regvals_init_6x20_511);
 		break;
 	case I2C_ALGO_SMBUS | I2C_HW_SMBUS_OV518:
 		rc = ov_write_regvals(c, regvals_init_6x20_518);
 		break;
 	default:
 		dev_err(&c->dev, "ov6x20: Unsupported adapter\n");
 		rc = -ENODEV;
 	}

 	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 = 1;

 	return rc;
 }

 static int ov6x20_free(struct i2c_client *c)
 {
 	struct ovcamchip *ov = i2c_get_clientdata(c);

 	kfree(ov->spriv);
 	return 0;
 }

 static int ov6x20_set_control(struct i2c_client *c,
 			      struct ovcamchip_control *ctl)
 {
 	struct ovcamchip *ov = i2c_get_clientdata(c);
 	struct ov6x20 *s = ov->spriv;
 	int rc;
 	int v = ctl->value;

 	switch (ctl->id) {
 	case OVCAMCHIP_CID_CONT:
 		rc = ov_write(c, REG_CNT, v >> 8);
 		break;
 	case OVCAMCHIP_CID_BRIGHT:
 		rc = ov_write(c, REG_BRT, v >> 8);
 		break;
 	case OVCAMCHIP_CID_SAT:
 		rc = ov_write(c, REG_SAT, v >> 8);
 		break;
 	case OVCAMCHIP_CID_HUE:
 		rc = ov_write(c, REG_RED, 0xFF - (v >> 8));
 		if (rc < 0)
 			goto out;

 		rc = ov_write(c, REG_BLUE, v >> 8);
 		break;
 	case OVCAMCHIP_CID_EXP:
 		rc = ov_write(c, REG_EXP, v);
 		break;
 	case OVCAMCHIP_CID_FREQ:
 	{
 		int sixty = (v == 60);

 		rc = ov_write(c, 0x2b, sixty?0xa8:0x28);
 		if (rc < 0)
 			goto out;

 		rc = ov_write(c, 0x2a, sixty?0x84:0xa4);
 		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, 0x4e, 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, 0x0e, v?0x80:0x00, 0x80);
 		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 ov6x20_get_control(struct i2c_client *c,
 			      struct ovcamchip_control *ctl)
 {
 	struct ovcamchip *ov = i2c_get_clientdata(c);
 	struct ov6x20 *s = ov->spriv;
 	int rc = 0;
 	unsigned char val = 0;

 	switch (ctl->id) {
 	case OVCAMCHIP_CID_CONT:
 		rc = ov_read(c, REG_CNT, &val);
 		ctl->value = val << 8;
 		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_HUE:
 		rc = ov_read(c, REG_BLUE, &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 ov6x20_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
 {
 	/******** QCIF-specific regs ********/

 	ov_write(c, 0x14, win->quarter?0x24:0x04);

 	/******** Palette-specific regs ********/

 	/* OV518 needs 8 bit multiplexed in color mode, and 16 bit in B&W */
 	if (c->adapter->id == (I2C_ALGO_SMBUS | I2C_HW_SMBUS_OV518)) {
 		if (win->format == VIDEO_PALETTE_GREY)
 			ov_write_mask(c, 0x13, 0x00, 0x20);
 		else
 			ov_write_mask(c, 0x13, 0x20, 0x20);
 	} else {
 		if (win->format == VIDEO_PALETTE_GREY)
 			ov_write_mask(c, 0x13, 0x20, 0x20);
 		else
 			ov_write_mask(c, 0x13, 0x00, 0x20);
 	}

 	/******** Clock programming ********/

 	/* The OV6620 needs special handling. This prevents the
 	 * severe banding that normally occurs */

 	/* Clock down */
 	ov_write(c, 0x2a, 0x04);

 	ov_write(c, 0x11, win->clockdiv);

 	ov_write(c, 0x2a, 0x84);
 	/* This next setting is critical. It seems to improve
 	 * the gain or the contrast. The "reserved" bits seem
 	 * to have some effect in this case. */
 	ov_write(c, 0x2d, 0x85); /* FIXME: This messes up banding filter */

 	return 0;
 }

 static int ov6x20_set_window(struct i2c_client *c, struct ovcamchip_window *win)
 {
 	int ret, hwscale, vwscale;

 	ret = ov6x20_mode_init(c, win);
 	if (ret < 0)
 		return ret;

 	if (win->quarter) {
 		hwscale = 0;
 		vwscale = 0;
 	} else {
 		hwscale = 1;
 		vwscale = 1;	/* The datasheet says 0; it's wrong */
 	}

 	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 ov6x20_command(struct i2c_client *c, unsigned int cmd, void *arg)
 {
 	switch (cmd) {
 	case OVCAMCHIP_CMD_S_CTRL:
 		return ov6x20_set_control(c, arg);
 	case OVCAMCHIP_CMD_G_CTRL:
 		return ov6x20_get_control(c, arg);
 	case OVCAMCHIP_CMD_S_MODE:
 		return ov6x20_set_window(c, arg);
 	default:
 		DDEBUG(2, &c->dev, "command not supported: %d", cmd);
 		return -ENOIOCTLCMD;
 	}
 }

 struct ovcamchip_ops ov6x20_ops = {
 	.init    =	ov6x20_init,
 	.free    =	ov6x20_free,
 	.command =	ov6x20_command,
 };
	/* OmniVision OV6620/OV6120 Camera Chip Support Code
	*
	* Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
	* http://alpha.dyndns.org/ov511/
	*
	* 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_CNT 0x05 /* Y contrast */
	#define REG_BRT 0x06 /* Y brightness */
	#define REG_WB_BLUE 0x0C /* WB blue ratio [5:0] */
	#define REG_WB_RED 0x0D /* WB red ratio [5:0] */
	#define REG_EXP 0x10 /* exposure */

	/* Window parameters */
	#define HWSBASE 0x38
	#define HWEBASE 0x3A
	#define VWSBASE 0x05
	#define VWEBASE 0x06

	struct ov6x20 {
	int auto_brt;
	int auto_exp;
	int backlight;
	int bandfilt;
	int mirror;
	};

	/* Initial values for use with OV511/OV511+ cameras */
	static struct ovcamchip_regvals regvals_init_6x20_511[] = {
	{ 0x12, 0x80 }, /* reset */
	{ 0x11, 0x01 },
	{ 0x03, 0x60 },
	{ 0x05, 0x7f }, /* For when autoadjust is off */
	{ 0x07, 0xa8 },
	{ 0x0c, 0x24 },
	{ 0x0d, 0x24 },
	{ 0x0f, 0x15 }, /* COMS */
	{ 0x10, 0x75 }, /* AEC Exposure time */
	{ 0x12, 0x24 }, /* Enable AGC and AWB */
	{ 0x14, 0x04 },
	{ 0x16, 0x03 },
	{ 0x26, 0xb2 }, /* BLC enable */
	/* 0x28: 0x05 Selects RGB format if RGB on */
	{ 0x28, 0x05 },
	{ 0x2a, 0x04 }, /* Disable framerate adjust */
	{ 0x2d, 0x99 },
	{ 0x33, 0xa0 }, /* Color Processing Parameter */
	{ 0x34, 0xd2 }, /* Max A/D range */
	{ 0x38, 0x8b },
	{ 0x39, 0x40 },

	{ 0x3c, 0x39 }, /* Enable AEC mode changing */
	{ 0x3c, 0x3c }, /* Change AEC mode */
	{ 0x3c, 0x24 }, /* Disable AEC mode changing */

	{ 0x3d, 0x80 },
	/* These next two registers (0x4a, 0x4b) are undocumented. They
	* control the color balance */
	{ 0x4a, 0x80 },
	{ 0x4b, 0x80 },
	{ 0x4d, 0xd2 }, /* This reduces noise a bit */
	{ 0x4e, 0xc1 },
	{ 0x4f, 0x04 },
	{ 0xff, 0xff }, /* END MARKER */
	};

	/* Initial values for use with OV518 cameras */
	static struct ovcamchip_regvals regvals_init_6x20_518[] = {
	{ 0x12, 0x80 }, /* Do a reset */
	{ 0x03, 0xc0 }, /* Saturation */
	{ 0x05, 0x8a }, /* Contrast */
	{ 0x0c, 0x24 }, /* AWB blue */
	{ 0x0d, 0x24 }, /* AWB red */
	{ 0x0e, 0x8d }, /* Additional 2x gain */
	{ 0x0f, 0x25 }, /* Black expanding level = 1.3V */
	{ 0x11, 0x01 }, /* Clock div. */
	{ 0x12, 0x24 }, /* Enable AGC and AWB */
	{ 0x13, 0x01 }, /* (default) */
	{ 0x14, 0x80 }, /* Set reserved bit 7 */
	{ 0x15, 0x01 }, /* (default) */
	{ 0x16, 0x03 }, /* (default) */
	{ 0x17, 0x38 }, /* (default) */
	{ 0x18, 0xea }, /* (default) */
	{ 0x19, 0x04 },
	{ 0x1a, 0x93 },
	{ 0x1b, 0x00 }, /* (default) */
	{ 0x1e, 0xc4 }, /* (default) */
	{ 0x1f, 0x04 }, /* (default) */
	{ 0x20, 0x20 }, /* Enable 1st stage aperture correction */
	{ 0x21, 0x10 }, /* Y offset */
	{ 0x22, 0x88 }, /* U offset */
	{ 0x23, 0xc0 }, /* Set XTAL power level */
	{ 0x24, 0x53 }, /* AEC bright ratio */
	{ 0x25, 0x7a }, /* AEC black ratio */
	{ 0x26, 0xb2 }, /* BLC enable */
	{ 0x27, 0xa2 }, /* Full output range */
	{ 0x28, 0x01 }, /* (default) */
	{ 0x29, 0x00 }, /* (default) */
	{ 0x2a, 0x84 }, /* (default) */
	{ 0x2b, 0xa8 }, /* Set custom frame rate */
	{ 0x2c, 0xa0 }, /* (reserved) */
	{ 0x2d, 0x95 }, /* Enable banding filter */
	{ 0x2e, 0x88 }, /* V offset */
	{ 0x33, 0x22 }, /* Luminance gamma on */
	{ 0x34, 0xc7 }, /* A/D bias */
	{ 0x36, 0x12 }, /* (reserved) */
	{ 0x37, 0x63 }, /* (reserved) */
	{ 0x38, 0x8b }, /* Quick AEC/AEB */
	{ 0x39, 0x00 }, /* (default) */
	{ 0x3a, 0x0f }, /* (default) */
	{ 0x3b, 0x3c }, /* (default) */
	{ 0x3c, 0x5c }, /* AEC controls */
	{ 0x3d, 0x80 }, /* Drop 1 (bad) frame when AEC change */
	{ 0x3e, 0x80 }, /* (default) */
	{ 0x3f, 0x02 }, /* (default) */
	{ 0x40, 0x10 }, /* (reserved) */
	{ 0x41, 0x10 }, /* (reserved) */
	{ 0x42, 0x00 }, /* (reserved) */
	{ 0x43, 0x7f }, /* (reserved) */
	{ 0x44, 0x80 }, /* (reserved) */
	{ 0x45, 0x1c }, /* (reserved) */
	{ 0x46, 0x1c }, /* (reserved) */
	{ 0x47, 0x80 }, /* (reserved) */
	{ 0x48, 0x5f }, /* (reserved) */
	{ 0x49, 0x00 }, /* (reserved) */
	{ 0x4a, 0x00 }, /* Color balance (undocumented) */
	{ 0x4b, 0x80 }, /* Color balance (undocumented) */
	{ 0x4c, 0x58 }, /* (reserved) */
	{ 0x4d, 0xd2 }, /* U = .938, V = .838 */
	{ 0x4e, 0xa0 }, /* (default) */
	{ 0x4f, 0x04 }, /* UV 3-point average */
	{ 0x50, 0xff }, /* (reserved) */
	{ 0x51, 0x58 }, /* (reserved) */
	{ 0x52, 0xc0 }, /* (reserved) */
	{ 0x53, 0x42 }, /* (reserved) */
	{ 0x27, 0xa6 }, /* Enable manual offset adj. (reg 21 & 22) */
	{ 0x12, 0x20 },
	{ 0x12, 0x24 },

	{ 0xff, 0xff }, /* END MARKER */
	};

	/* This initializes the OV6x20 camera chip and relevant variables. */
	static int ov6x20_init(struct i2c_client *c)
	{
	struct ovcamchip *ov = i2c_get_clientdata(c);
	struct ov6x20 *s;
	int rc;

	DDEBUG(4, &c->dev, "entered");

	switch (c->adapter->id) {
	case I2C_ALGO_SMBUS \| I2C_HW_SMBUS_OV511:
	rc = ov_write_regvals(c, regvals_init_6x20_511);
	break;
	case I2C_ALGO_SMBUS \| I2C_HW_SMBUS_OV518:
	rc = ov_write_regvals(c, regvals_init_6x20_518);
	break;
	default:
	dev_err(&c->dev, "ov6x20: Unsupported adapter\n");
	rc = -ENODEV;
	}

	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 = 1;

	return rc;
	}

	static int ov6x20_free(struct i2c_client *c)
	{
	struct ovcamchip *ov = i2c_get_clientdata(c);

	kfree(ov->spriv);
	return 0;
	}

	static int ov6x20_set_control(struct i2c_client *c,
	struct ovcamchip_control *ctl)
	{
	struct ovcamchip *ov = i2c_get_clientdata(c);
	struct ov6x20 *s = ov->spriv;
	int rc;
	int v = ctl->value;

	switch (ctl->id) {
	case OVCAMCHIP_CID_CONT:
	rc = ov_write(c, REG_CNT, v >> 8);
	break;
	case OVCAMCHIP_CID_BRIGHT:
	rc = ov_write(c, REG_BRT, v >> 8);
	break;
	case OVCAMCHIP_CID_SAT:
	rc = ov_write(c, REG_SAT, v >> 8);
	break;
	case OVCAMCHIP_CID_HUE:
	rc = ov_write(c, REG_RED, 0xFF - (v >> 8));
	if (rc < 0)
	goto out;

	rc = ov_write(c, REG_BLUE, v >> 8);
	break;
	case OVCAMCHIP_CID_EXP:
	rc = ov_write(c, REG_EXP, v);
	break;
	case OVCAMCHIP_CID_FREQ:
	{
	int sixty = (v == 60);

	rc = ov_write(c, 0x2b, sixty?0xa8:0x28);
	if (rc < 0)
	goto out;

	rc = ov_write(c, 0x2a, sixty?0x84:0xa4);
	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, 0x4e, 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, 0x0e, v?0x80:0x00, 0x80);
	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 ov6x20_get_control(struct i2c_client *c,
	struct ovcamchip_control *ctl)
	{
	struct ovcamchip *ov = i2c_get_clientdata(c);
	struct ov6x20 *s = ov->spriv;
	int rc = 0;
	unsigned char val = 0;

	switch (ctl->id) {
	case OVCAMCHIP_CID_CONT:
	rc = ov_read(c, REG_CNT, &val);
	ctl->value = val << 8;
	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_HUE:
	rc = ov_read(c, REG_BLUE, &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 ov6x20_mode_init(struct i2c_client c, struct ovcamchip_window win)
	{
	/****** QCIF-specific regs ******/

	ov_write(c, 0x14, win->quarter?0x24:0x04);

	/****** Palette-specific regs ******/

	/* OV518 needs 8 bit multiplexed in color mode, and 16 bit in B&W */
	if (c->adapter->id == (I2C_ALGO_SMBUS \| I2C_HW_SMBUS_OV518)) {
	if (win->format == VIDEO_PALETTE_GREY)
	ov_write_mask(c, 0x13, 0x00, 0x20);
	else
	ov_write_mask(c, 0x13, 0x20, 0x20);
	} else {
	if (win->format == VIDEO_PALETTE_GREY)
	ov_write_mask(c, 0x13, 0x20, 0x20);
	else
	ov_write_mask(c, 0x13, 0x00, 0x20);
	}

	/****** Clock programming ******/

	/* The OV6620 needs special handling. This prevents the
	* severe banding that normally occurs */

	/* Clock down */
	ov_write(c, 0x2a, 0x04);

	ov_write(c, 0x11, win->clockdiv);

	ov_write(c, 0x2a, 0x84);
	/* This next setting is critical. It seems to improve
	* the gain or the contrast. The "reserved" bits seem
	* to have some effect in this case. */
	ov_write(c, 0x2d, 0x85); /* FIXME: This messes up banding filter */

	return 0;
	}

	static int ov6x20_set_window(struct i2c_client c, struct ovcamchip_window win)
	{
	int ret, hwscale, vwscale;

	ret = ov6x20_mode_init(c, win);
	if (ret < 0)
	return ret;

	if (win->quarter) {
	hwscale = 0;
	vwscale = 0;
	} else {
	hwscale = 1;
	vwscale = 1; /* The datasheet says 0; it's wrong */
	}

	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 ov6x20_command(struct i2c_client c, unsigned int cmd, void arg)
	{
	switch (cmd) {
	case OVCAMCHIP_CMD_S_CTRL:
	return ov6x20_set_control(c, arg);
	case OVCAMCHIP_CMD_G_CTRL:
	return ov6x20_get_control(c, arg);
	case OVCAMCHIP_CMD_S_MODE:
	return ov6x20_set_window(c, arg);
	default:
	DDEBUG(2, &c->dev, "command not supported: %d", cmd);
	return -ENOIOCTLCMD;
	}
	}

	struct ovcamchip_ops ov6x20_ops = {
	.init = ov6x20_init,
	.free = ov6x20_free,
	.command = ov6x20_command,
	};