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

 /*
  *  indycam.c - Silicon Graphics IndyCam digital camera driver
  *
  *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
  *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.
  */

 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/major.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/slab.h>

 /* IndyCam decodes stream of photons into digital image representation ;-) */
 #include <linux/videodev2.h>
 #include <linux/i2c.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-chip-ident.h>

 #include "indycam.h"

 #define INDYCAM_MODULE_VERSION "0.0.5"

 MODULE_DESCRIPTION("SGI IndyCam driver");
 MODULE_VERSION(INDYCAM_MODULE_VERSION);
 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
 MODULE_LICENSE("GPL");


 // #define INDYCAM_DEBUG

 #ifdef INDYCAM_DEBUG
 #define dprintk(x...) printk("IndyCam: " x);
 #define indycam_regdump(client) indycam_regdump_debug(client)
 #else
 #define dprintk(x...)
 #define indycam_regdump(client)
 #endif

 struct indycam {
 	struct v4l2_subdev sd;
 	u8 version;
 };

 static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct indycam, sd);
 }

 static const u8 initseq[] = {
 	INDYCAM_CONTROL_AGCENA,		/* INDYCAM_CONTROL */
 	INDYCAM_SHUTTER_60,		/* INDYCAM_SHUTTER */
 	INDYCAM_GAIN_DEFAULT,		/* INDYCAM_GAIN */
 	0x00,				/* INDYCAM_BRIGHTNESS (read-only) */
 	INDYCAM_RED_BALANCE_DEFAULT,	/* INDYCAM_RED_BALANCE */
 	INDYCAM_BLUE_BALANCE_DEFAULT,	/* INDYCAM_BLUE_BALANCE */
 	INDYCAM_RED_SATURATION_DEFAULT,	/* INDYCAM_RED_SATURATION */
 	INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
 };

 /* IndyCam register handling */

 static int indycam_read_reg(struct v4l2_subdev *sd, u8 reg, u8 *value)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	int ret;

 	if (reg == INDYCAM_REG_RESET) {
 		dprintk("indycam_read_reg(): "
 			"skipping write-only register %d\n", reg);
 		*value = 0;
 		return 0;
 	}

 	ret = i2c_smbus_read_byte_data(client, reg);

 	if (ret < 0) {
 		printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
 		       "register = 0x%02x\n", reg);
 		return ret;
 	}

 	*value = (u8)ret;

 	return 0;
 }

 static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	int err;

 	if (reg == INDYCAM_REG_BRIGHTNESS || reg == INDYCAM_REG_VERSION) {
 		dprintk("indycam_write_reg(): "
 			"skipping read-only register %d\n", reg);
 		return 0;
 	}

 	dprintk("Writing Reg %d = 0x%02x\n", reg, value);
 	err = i2c_smbus_write_byte_data(client, reg, value);

 	if (err) {
 		printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
 		       "register = 0x%02x, value = 0x%02x\n", reg, value);
 	}
 	return err;
 }

 static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
 			       u8 length, u8 *data)
 {
 	int i, err;

 	for (i = 0; i < length; i++) {
 		err = indycam_write_reg(sd, reg + i, data[i]);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 /* Helper functions */

 #ifdef INDYCAM_DEBUG
 static void indycam_regdump_debug(struct v4l2_subdev *sd)
 {
 	int i;
 	u8 val;

 	for (i = 0; i < 9; i++) {
 		indycam_read_reg(sd, i, &val);
 		dprintk("Reg %d = 0x%02x\n", i, val);
 	}
 }
 #endif

 static int indycam_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 {
 	struct indycam *camera = to_indycam(sd);
 	u8 reg;
 	int ret = 0;

 	switch (ctrl->id) {
 	case V4L2_CID_AUTOGAIN:
 	case V4L2_CID_AUTO_WHITE_BALANCE:
 		ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
 		if (ret)
 			return -EIO;
 		if (ctrl->id == V4L2_CID_AUTOGAIN)
 			ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
 				? 1 : 0;
 		else
 			ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
 				? 1 : 0;
 		break;
 	case V4L2_CID_EXPOSURE:
 		ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, &reg);
 		if (ret)
 			return -EIO;
 		ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
 		break;
 	case V4L2_CID_GAIN:
 		ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, &reg);
 		if (ret)
 			return -EIO;
 		ctrl->value = (s32)reg;
 		break;
 	case V4L2_CID_RED_BALANCE:
 		ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, &reg);
 		if (ret)
 			return -EIO;
 		ctrl->value = (s32)reg;
 		break;
 	case V4L2_CID_BLUE_BALANCE:
 		ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, &reg);
 		if (ret)
 			return -EIO;
 		ctrl->value = (s32)reg;
 		break;
 	case INDYCAM_CONTROL_RED_SATURATION:
 		ret = indycam_read_reg(sd,
 				       INDYCAM_REG_RED_SATURATION, &reg);
 		if (ret)
 			return -EIO;
 		ctrl->value = (s32)reg;
 		break;
 	case INDYCAM_CONTROL_BLUE_SATURATION:
 		ret = indycam_read_reg(sd,
 				       INDYCAM_REG_BLUE_SATURATION, &reg);
 		if (ret)
 			return -EIO;
 		ctrl->value = (s32)reg;
 		break;
 	case V4L2_CID_GAMMA:
 		if (camera->version == CAMERA_VERSION_MOOSE) {
 			ret = indycam_read_reg(sd,
 					       INDYCAM_REG_GAMMA, &reg);
 			if (ret)
 				return -EIO;
 			ctrl->value = (s32)reg;
 		} else {
 			ctrl->value = INDYCAM_GAMMA_DEFAULT;
 		}
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static int indycam_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 {
 	struct indycam *camera = to_indycam(sd);
 	u8 reg;
 	int ret = 0;

 	switch (ctrl->id) {
 	case V4L2_CID_AUTOGAIN:
 	case V4L2_CID_AUTO_WHITE_BALANCE:
 		ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
 		if (ret)
 			break;

 		if (ctrl->id == V4L2_CID_AUTOGAIN) {
 			if (ctrl->value)
 				reg |= INDYCAM_CONTROL_AGCENA;
 			else
 				reg &= ~INDYCAM_CONTROL_AGCENA;
 		} else {
 			if (ctrl->value)
 				reg |= INDYCAM_CONTROL_AWBCTL;
 			else
 				reg &= ~INDYCAM_CONTROL_AWBCTL;
 		}

 		ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
 		break;
 	case V4L2_CID_EXPOSURE:
 		reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
 		ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
 		break;
 	case V4L2_CID_GAIN:
 		ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
 		break;
 	case V4L2_CID_RED_BALANCE:
 		ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
 					ctrl->value);
 		break;
 	case V4L2_CID_BLUE_BALANCE:
 		ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
 					ctrl->value);
 		break;
 	case INDYCAM_CONTROL_RED_SATURATION:
 		ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
 					ctrl->value);
 		break;
 	case INDYCAM_CONTROL_BLUE_SATURATION:
 		ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
 					ctrl->value);
 		break;
 	case V4L2_CID_GAMMA:
 		if (camera->version == CAMERA_VERSION_MOOSE) {
 			ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
 						ctrl->value);
 		}
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 /* I2C-interface */

 static int indycam_g_chip_ident(struct v4l2_subdev *sd,
 		struct v4l2_dbg_chip_ident *chip)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	struct indycam *camera = to_indycam(sd);

 	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_INDYCAM,
 		       camera->version);
 }

 /* ----------------------------------------------------------------------- */

 static const struct v4l2_subdev_core_ops indycam_core_ops = {
 	.g_chip_ident = indycam_g_chip_ident,
 	.g_ctrl = indycam_g_ctrl,
 	.s_ctrl = indycam_s_ctrl,
 };

 static const struct v4l2_subdev_ops indycam_ops = {
 	.core = &indycam_core_ops,
 };

 static int indycam_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
 	int err = 0;
 	struct indycam *camera;
 	struct v4l2_subdev *sd;

 	v4l_info(client, "chip found @ 0x%x (%s)\n",
 			client->addr << 1, client->adapter->name);

 	camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
 	if (!camera)
 		return -ENOMEM;

 	sd = &camera->sd;
 	v4l2_i2c_subdev_init(sd, client, &indycam_ops);

 	camera->version = i2c_smbus_read_byte_data(client,
 						   INDYCAM_REG_VERSION);
 	if (camera->version != CAMERA_VERSION_INDY &&
 	    camera->version != CAMERA_VERSION_MOOSE) {
 		kfree(camera);
 		return -ENODEV;
 	}

 	printk(KERN_INFO "IndyCam v%d.%d detected\n",
 	       INDYCAM_VERSION_MAJOR(camera->version),
 	       INDYCAM_VERSION_MINOR(camera->version));

 	indycam_regdump(sd);

 	// initialize
 	err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
 	if (err) {
 		printk(KERN_ERR "IndyCam initialization failed\n");
 		kfree(camera);
 		return -EIO;
 	}

 	indycam_regdump(sd);

 	// white balance
 	err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
 			  INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
 	if (err) {
 		printk(KERN_ERR "IndyCam: White balancing camera failed\n");
 		kfree(camera);
 		return -EIO;
 	}

 	indycam_regdump(sd);

 	printk(KERN_INFO "IndyCam initialized\n");

 	return 0;
 }

 static int indycam_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);

 	v4l2_device_unregister_subdev(sd);
 	kfree(to_indycam(sd));
 	return 0;
 }

 static const struct i2c_device_id indycam_id[] = {
 	{ "indycam", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, indycam_id);

 static struct i2c_driver indycam_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= "indycam",
 	},
 	.probe		= indycam_probe,
 	.remove		= indycam_remove,
 	.id_table	= indycam_id,
 };

 static __init int init_indycam(void)
 {
 	return i2c_add_driver(&indycam_driver);
 }

 static __exit void exit_indycam(void)
 {
 	i2c_del_driver(&indycam_driver);
 }

 module_init(init_indycam);
 module_exit(exit_indycam);
	/*
	* indycam.c - Silicon Graphics IndyCam digital camera driver
	*
	* Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
	* Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/fs.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/major.h>
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/slab.h>

	/* IndyCam decodes stream of photons into digital image representation ;-) */
	#include <linux/videodev2.h>
	#include <linux/i2c.h>
	#include <media/v4l2-device.h>
	#include <media/v4l2-chip-ident.h>

	#include "indycam.h"

	#define INDYCAM_MODULE_VERSION "0.0.5"

	MODULE_DESCRIPTION("SGI IndyCam driver");
	MODULE_VERSION(INDYCAM_MODULE_VERSION);
	MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
	MODULE_LICENSE("GPL");


	// #define INDYCAM_DEBUG

	#ifdef INDYCAM_DEBUG
	#define dprintk(x...) printk("IndyCam: " x);
	#define indycam_regdump(client) indycam_regdump_debug(client)
	#else
	#define dprintk(x...)
	#define indycam_regdump(client)
	#endif

	struct indycam {
	struct v4l2_subdev sd;
	u8 version;
	};

	static inline struct indycam to_indycam(struct v4l2_subdev sd)
	{
	return container_of(sd, struct indycam, sd);
	}

	static const u8 initseq[] = {
	INDYCAM_CONTROL_AGCENA, /* INDYCAM_CONTROL */
	INDYCAM_SHUTTER_60, /* INDYCAM_SHUTTER */
	INDYCAM_GAIN_DEFAULT, /* INDYCAM_GAIN */
	0x00, /* INDYCAM_BRIGHTNESS (read-only) */
	INDYCAM_RED_BALANCE_DEFAULT, /* INDYCAM_RED_BALANCE */
	INDYCAM_BLUE_BALANCE_DEFAULT, /* INDYCAM_BLUE_BALANCE */
	INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
	INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
	};

	/* IndyCam register handling */

	static int indycam_read_reg(struct v4l2_subdev sd, u8 reg, u8 value)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret;

	if (reg == INDYCAM_REG_RESET) {
	dprintk("indycam_read_reg(): "
	"skipping write-only register %d\n", reg);
	*value = 0;
	return 0;
	}

	ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0) {
	printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
	"register = 0x%02x\n", reg);
	return ret;
	}

	*value = (u8)ret;

	return 0;
	}

	static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int err;

	if (reg == INDYCAM_REG_BRIGHTNESS \|\| reg == INDYCAM_REG_VERSION) {
	dprintk("indycam_write_reg(): "
	"skipping read-only register %d\n", reg);
	return 0;
	}

	dprintk("Writing Reg %d = 0x%02x\n", reg, value);
	err = i2c_smbus_write_byte_data(client, reg, value);

	if (err) {
	printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
	"register = 0x%02x, value = 0x%02x\n", reg, value);
	}
	return err;
	}

	static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
	u8 length, u8 *data)
	{
	int i, err;

	for (i = 0; i < length; i++) {
	err = indycam_write_reg(sd, reg + i, data[i]);
	if (err)
	return err;
	}

	return 0;
	}

	/* Helper functions */

	#ifdef INDYCAM_DEBUG
	static void indycam_regdump_debug(struct v4l2_subdev *sd)
	{
	int i;
	u8 val;

	for (i = 0; i < 9; i++) {
	indycam_read_reg(sd, i, &val);
	dprintk("Reg %d = 0x%02x\n", i, val);
	}
	}
	#endif

	static int indycam_g_ctrl(struct v4l2_subdev sd, struct v4l2_control ctrl)
	{
	struct indycam *camera = to_indycam(sd);
	u8 reg;
	int ret = 0;

	switch (ctrl->id) {
	case V4L2_CID_AUTOGAIN:
	case V4L2_CID_AUTO_WHITE_BALANCE:
	ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
	if (ret)
	return -EIO;
	if (ctrl->id == V4L2_CID_AUTOGAIN)
	ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
	? 1 : 0;
	else
	ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
	? 1 : 0;
	break;
	case V4L2_CID_EXPOSURE:
	ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, &reg);
	if (ret)
	return -EIO;
	ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
	break;
	case V4L2_CID_GAIN:
	ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, &reg);
	if (ret)
	return -EIO;
	ctrl->value = (s32)reg;
	break;
	case V4L2_CID_RED_BALANCE:
	ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, &reg);
	if (ret)
	return -EIO;
	ctrl->value = (s32)reg;
	break;
	case V4L2_CID_BLUE_BALANCE:
	ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, &reg);
	if (ret)
	return -EIO;
	ctrl->value = (s32)reg;
	break;
	case INDYCAM_CONTROL_RED_SATURATION:
	ret = indycam_read_reg(sd,
	INDYCAM_REG_RED_SATURATION, &reg);
	if (ret)
	return -EIO;
	ctrl->value = (s32)reg;
	break;
	case INDYCAM_CONTROL_BLUE_SATURATION:
	ret = indycam_read_reg(sd,
	INDYCAM_REG_BLUE_SATURATION, &reg);
	if (ret)
	return -EIO;
	ctrl->value = (s32)reg;
	break;
	case V4L2_CID_GAMMA:
	if (camera->version == CAMERA_VERSION_MOOSE) {
	ret = indycam_read_reg(sd,
	INDYCAM_REG_GAMMA, &reg);
	if (ret)
	return -EIO;
	ctrl->value = (s32)reg;
	} else {
	ctrl->value = INDYCAM_GAMMA_DEFAULT;
	}
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static int indycam_s_ctrl(struct v4l2_subdev sd, struct v4l2_control ctrl)
	{
	struct indycam *camera = to_indycam(sd);
	u8 reg;
	int ret = 0;

	switch (ctrl->id) {
	case V4L2_CID_AUTOGAIN:
	case V4L2_CID_AUTO_WHITE_BALANCE:
	ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
	if (ret)
	break;

	if (ctrl->id == V4L2_CID_AUTOGAIN) {
	if (ctrl->value)
	reg \|= INDYCAM_CONTROL_AGCENA;
	else
	reg &= ~INDYCAM_CONTROL_AGCENA;
	} else {
	if (ctrl->value)
	reg \|= INDYCAM_CONTROL_AWBCTL;
	else
	reg &= ~INDYCAM_CONTROL_AWBCTL;
	}

	ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
	break;
	case V4L2_CID_EXPOSURE:
	reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
	ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
	break;
	case V4L2_CID_GAIN:
	ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
	break;
	case V4L2_CID_RED_BALANCE:
	ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
	ctrl->value);
	break;
	case V4L2_CID_BLUE_BALANCE:
	ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
	ctrl->value);
	break;
	case INDYCAM_CONTROL_RED_SATURATION:
	ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
	ctrl->value);
	break;
	case INDYCAM_CONTROL_BLUE_SATURATION:
	ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
	ctrl->value);
	break;
	case V4L2_CID_GAMMA:
	if (camera->version == CAMERA_VERSION_MOOSE) {
	ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
	ctrl->value);
	}
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	/* I2C-interface */

	static int indycam_g_chip_ident(struct v4l2_subdev *sd,
	struct v4l2_dbg_chip_ident *chip)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct indycam *camera = to_indycam(sd);

	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_INDYCAM,
	camera->version);
	}

	/* ----------------------------------------------------------------------- */

	static const struct v4l2_subdev_core_ops indycam_core_ops = {
	.g_chip_ident = indycam_g_chip_ident,
	.g_ctrl = indycam_g_ctrl,
	.s_ctrl = indycam_s_ctrl,
	};

	static const struct v4l2_subdev_ops indycam_ops = {
	.core = &indycam_core_ops,
	};

	static int indycam_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int err = 0;
	struct indycam *camera;
	struct v4l2_subdev *sd;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
	client->addr << 1, client->adapter->name);

	camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
	if (!camera)
	return -ENOMEM;

	sd = &camera->sd;
	v4l2_i2c_subdev_init(sd, client, &indycam_ops);

	camera->version = i2c_smbus_read_byte_data(client,
	INDYCAM_REG_VERSION);
	if (camera->version != CAMERA_VERSION_INDY &&
	camera->version != CAMERA_VERSION_MOOSE) {
	kfree(camera);
	return -ENODEV;
	}

	printk(KERN_INFO "IndyCam v%d.%d detected\n",
	INDYCAM_VERSION_MAJOR(camera->version),
	INDYCAM_VERSION_MINOR(camera->version));

	indycam_regdump(sd);

	// initialize
	err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
	if (err) {
	printk(KERN_ERR "IndyCam initialization failed\n");
	kfree(camera);
	return -EIO;
	}

	indycam_regdump(sd);

	// white balance
	err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
	INDYCAM_CONTROL_AGCENA \| INDYCAM_CONTROL_AWBCTL);
	if (err) {
	printk(KERN_ERR "IndyCam: White balancing camera failed\n");
	kfree(camera);
	return -EIO;
	}

	indycam_regdump(sd);

	printk(KERN_INFO "IndyCam initialized\n");

	return 0;
	}

	static int indycam_remove(struct i2c_client *client)
	{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	kfree(to_indycam(sd));
	return 0;
	}

	static const struct i2c_device_id indycam_id[] = {
	{ "indycam", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, indycam_id);

	static struct i2c_driver indycam_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = "indycam",
	},
	.probe = indycam_probe,
	.remove = indycam_remove,
	.id_table = indycam_id,
	};

	static __init int init_indycam(void)
	{
	return i2c_add_driver(&indycam_driver);
	}

	static __exit void exit_indycam(void)
	{
	i2c_del_driver(&indycam_driver);
	}

	module_init(init_indycam);
	module_exit(exit_indycam);