drivers/media/video/ov5650.c - kernel/panda - Git at Google

 /*
  * OmniVision OV5650 sensor driver
  *
  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
  *
  * 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 version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/videodev2.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/log2.h>
 #include <linux/delay.h>
 #include <linux/module.h>

 #include <media/v4l2-device.h>
 #include <media/v4l2-subdev.h>

 #include <media/ov5650.h>

 /* OV5650 has only one fixed colorspace per pixelcode */
 struct ov5650_datafmt {
 	enum v4l2_mbus_pixelcode	code;
 	enum v4l2_colorspace		colorspace;
 };

 enum ov5650_size {
 	OV5650_SIZE_5MP,
 	OV5650_SIZE_LAST,
 };

 static const struct v4l2_frmsize_discrete ov5650_frmsizes[OV5650_SIZE_LAST] = {
 	{ 2592, 1944 },
 };

 struct ov5650 {
 	struct v4l2_subdev subdev;
 	struct media_pad pad;

 	struct v4l2_mbus_framefmt format;

 	const struct ov5650_platform_data *pdata;
 };

 static inline struct ov5650 *to_ov5650(struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct ov5650, subdev);
 }

 /**
  * struct ov5650_reg - ov5650 register format
  * @reg: 16-bit offset to register
  * @val: 8/16/32-bit register value
  * @length: length of the register
  *
  * Define a structure for OV5650 register initialization values
  */
 struct ov5650_reg {
 	u16	reg;
 	u8	val;
 };

 /* TODO: Divide this properly */
 static const struct ov5650_reg configscript_5MP[] = {
 	{ 0x3008, 0x82 },
 	{ 0x3008, 0x42 },
 	{ 0x3103, 0x93 },
 	{ 0x3b07, 0x0c },
 	{ 0x3017, 0xff },
 	{ 0x3018, 0xfc },
 	{ 0x3706, 0x41 },
 	{ 0x3703, 0xe6 },
 	{ 0x3613, 0x44 },
 	{ 0x3630, 0x22 },
 	{ 0x3605, 0x04 },
 	{ 0x3606, 0x3f },
 	{ 0x3712, 0x13 },
 	{ 0x370e, 0x00 },
 	{ 0x370b, 0x40 },
 	{ 0x3600, 0x54 },
 	{ 0x3601, 0x05 },
 	{ 0x3713, 0x22 },
 	{ 0x3714, 0x27 },
 	{ 0x3631, 0x22 },
 	{ 0x3612, 0x1a },
 	{ 0x3604, 0x40 },
 	{ 0x3705, 0xda },
 	{ 0x370a, 0x80 },
 	{ 0x370c, 0x00 },
 	{ 0x3710, 0x28 },
 	{ 0x3702, 0x3a },
 	{ 0x3704, 0x18 },
 	{ 0x3a18, 0x00 },
 	{ 0x3a19, 0xf8 },
 	{ 0x3a00, 0x38 },
 	{ 0x3800, 0x02 },
 	{ 0x3801, 0x54 },
 	{ 0x3803, 0x0c },
 	{ 0x3808, 0x0a },
 	{ 0x3809, 0x20 },
 	{ 0x380a, 0x07 },
 	{ 0x380b, 0x98 },
 	{ 0x380c, 0x0c },
 	{ 0x380d, 0xb4 },
 	{ 0x380e, 0x07 },
 	{ 0x380f, 0xb0 },
 	{ 0x3830, 0x50 },
 	{ 0x3a08, 0x12 },
 	{ 0x3a09, 0x70 },
 	{ 0x3a0a, 0x0f },
 	{ 0x3a0b, 0x60 },
 	{ 0x3a0d, 0x06 },
 	{ 0x3a0e, 0x06 },
 	{ 0x3a13, 0x54 },
 	{ 0x3815, 0x82 },
 	{ 0x5059, 0x80 },
 	{ 0x505a, 0x0a },
 	{ 0x505b, 0x2e },
 	{ 0x3a1a, 0x06 },
 	{ 0x3503, 0x00 },
 	{ 0x3623, 0x01 },
 	{ 0x3633, 0x24 },
 	{ 0x3c01, 0x34 },
 	{ 0x3c04, 0x28 },
 	{ 0x3c05, 0x98 },
 	{ 0x3c07, 0x07 },
 	{ 0x3c09, 0xc2 },
 	{ 0x4000, 0x05 },
 	{ 0x401d, 0x28 },
 	{ 0x4001, 0x02 },
 	{ 0x401c, 0x46 },
 	{ 0x5046, 0x01 },
 	{ 0x3810, 0x40 },
 	{ 0x3836, 0x41 },
 	{ 0x505f, 0x04 },
 	{ 0x5000, 0x00 },
 	{ 0x5001, 0x00 },
 	{ 0x5002, 0x00 },
 	{ 0x503d, 0x00 },
 	{ 0x5901, 0x00 },
 	{ 0x585a, 0x01 },
 	{ 0x585b, 0x2c },
 	{ 0x585c, 0x01 },
 	{ 0x585d, 0x93 },
 	{ 0x585e, 0x01 },
 	{ 0x585f, 0x90 },
 	{ 0x5860, 0x01 },
 	{ 0x5861, 0x0d },
 	{ 0x5180, 0xc0 },
 	{ 0x5184, 0x00 },
 	{ 0x470a, 0x00 },
 	{ 0x470b, 0x00 },
 	{ 0x470c, 0x00 },
 	{ 0x300f, 0x8e },
 	{ 0x3603, 0xa7 },
 	{ 0x3615, 0x50 },
 	{ 0x3632, 0x55 },
 	{ 0x3620, 0x56 },
 	{ 0x3621, 0x2f },
 	{ 0x381a, 0x3c },
 	{ 0x3818, 0xc0 },
 	{ 0x3631, 0x36 },
 	{ 0x3632, 0x5f },
 	{ 0x3711, 0x24 },
 	{ 0x401f, 0x03 },
 	{ 0x3011, 0x14 },
 	{ 0x3007, 0x3b },
 	{ 0x4801, 0x0f },
 	{ 0x3003, 0x03 },
 	{ 0x300e, 0x0c },
 	{ 0x4803, 0x50 },
 	{ 0x4800, 0x04 },
 	{ 0x300f, 0x8f },
 	{ 0x3815, 0x82 },
 	{ 0x3003, 0x01 },
 	{ 0x3008, 0x02 },
 };

 /**
  * ov5650_reg_read - Read a value from a register in an ov5650 sensor device
  * @client: i2c driver client structure
  * @reg: register address / offset
  * @val: stores the value that gets read
  *
  * Read a value from a register in an ov5650 sensor device.
  * The value is returned in 'val'.
  * Returns zero if successful, or non-zero otherwise.
  */
 static int ov5650_reg_read(struct i2c_client *client, u16 reg, u8 *val)
 {
 	int ret;
 	u8 data[2] = {0};
 	struct i2c_msg msg = {
 		.addr	= client->addr,
 		.flags	= 0,
 		.len	= 2,
 		.buf	= data,
 	};

 	data[0] = (u8)(reg >> 8);
 	data[1] = (u8)(reg & 0xff);

 	ret = i2c_transfer(client->adapter, &msg, 1);
 	if (ret < 0)
 		goto err;

 	msg.flags = I2C_M_RD;
 	msg.len = 1;
 	ret = i2c_transfer(client->adapter, &msg, 1);
 	if (ret < 0)
 		goto err;

 	*val = data[0];
 	return 0;

 err:
 	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
 	return ret;
 }

 /**
  * Write a value to a register in ov5650 sensor device.
  * @client: i2c driver client structure.
  * @reg: Address of the register to read value from.
  * @val: Value to be written to a specific register.
  * Returns zero if successful, or non-zero otherwise.
  */
 static int ov5650_reg_write(struct i2c_client *client, u16 reg, u8 val)
 {
 	int ret;
 	unsigned char data[3] = { (u8)(reg >> 8), (u8)(reg & 0xff), val };
 	struct i2c_msg msg = {
 		.addr	= client->addr,
 		.flags	= 0,
 		.len	= 3,
 		.buf	= data,
 	};

 	ret = i2c_transfer(client->adapter, &msg, 1);
 	if (ret < 0) {
 		dev_err(&client->dev, "Failed writing register 0x%02x!\n", reg);
 		return ret;
 	}

 	return 0;
 }

 /**
  * Initialize a list of ov5650 registers.
  * The list of registers is terminated by the pair of values
  * @client: i2c driver client structure.
  * @reglist[]: List of address of the registers to write data.
  * Returns zero if successful, or non-zero otherwise.
  */
 static int ov5650_reg_writes(struct i2c_client *client,
 			     const struct ov5650_reg reglist[],
 			     int size)
 {
 	int err = 0, i;

 	for (i = 0; i < size; i++) {
 		err = ov5650_reg_write(client, reglist[i].reg,
 				reglist[i].val);
 		if (err)
 			return err;
 	}
 	return 0;
 }

 static struct v4l2_mbus_framefmt *
 __ov5650_get_pad_format(struct ov5650 *ov5650, struct v4l2_subdev_fh *fh,
 			 unsigned int pad, enum v4l2_subdev_format_whence which)
 {
 	switch (which) {
 	case V4L2_SUBDEV_FORMAT_TRY:
 		return v4l2_subdev_get_try_format(fh, pad);
 	case V4L2_SUBDEV_FORMAT_ACTIVE:
 		return &ov5650->format;
 	default:
 		return NULL;
 	}
 }

 /* -----------------------------------------------------------------------------
  * V4L2 subdev internal operations
  */

 static int ov5650_s_power(struct v4l2_subdev *sd, int on)
 {
 	struct ov5650 *ov5650 = to_ov5650(sd);

 	return ov5650->pdata->s_power(sd, on);
 }

 static int ov5650_registered(struct v4l2_subdev *subdev)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(subdev);
 	int ret = 0;
 	u8 revision = 0;

 	ret = ov5650_s_power(subdev, 1);
 	if (ret < 0) {
 		dev_err(&client->dev, "OV5650 power up failed\n");
 		return ret;
 	}

 	ret = ov5650_reg_read(client, 0x302A, &revision);
 	if (ret) {
 		dev_err(&client->dev, "Failure to detect OV5650 chip\n");
 		goto out;
 	}

 	revision &= 0xF;

 	dev_info(&client->dev, "Detected a OV5650 chip, revision %x\n",
 		 revision);

 out:
 	ov5650_s_power(subdev, 0);

 	return ret;
 }

 static int ov5650_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
 {
 	struct v4l2_mbus_framefmt *format;

 	format = v4l2_subdev_get_try_format(fh, 0);
 	format->code = V4L2_MBUS_FMT_SGRBG10_1X10;
 	format->width = ov5650_frmsizes[OV5650_SIZE_5MP].width;
 	format->height = ov5650_frmsizes[OV5650_SIZE_5MP].height;
 	format->field = V4L2_FIELD_NONE;
 	format->colorspace = V4L2_COLORSPACE_SRGB;

 	return 0;
 }

 static int ov5650_close(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
 {
 	return 0;
 }

 static int ov5650_s_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	int ret = 0;

 	if (enable) {
 		/* HACK: Hardcoding to 5MP! */
 		ret = ov5650_reg_writes(client, configscript_5MP,
 				ARRAY_SIZE(configscript_5MP));
 	}

 	return ret;
 }

 static int ov5650_g_fmt(struct v4l2_subdev *sd,
 			struct v4l2_subdev_fh *fh,
 			struct v4l2_subdev_format *format)
 {
 	struct ov5650 *ov5650 = to_ov5650(sd);

 	format->format = *__ov5650_get_pad_format(ov5650, fh, format->pad,
 						   format->which);

 	return 0;
 }

 static int ov5650_s_fmt(struct v4l2_subdev *sd,
 			struct v4l2_subdev_fh *fh,
 			struct v4l2_subdev_format *format)
 {
 	struct ov5650 *ov5650 = to_ov5650(sd);
 	struct v4l2_mbus_framefmt *__format;

 	__format = __ov5650_get_pad_format(ov5650, fh, format->pad,
 					    format->which);

 	/* FIXME: Do an actual change! */
 	format->format = *__format;

 	return 0;
 }

 static struct v4l2_subdev_internal_ops ov5650_subdev_internal_ops = {
 	.registered = ov5650_registered,
 	.open = ov5650_open,
 	.close = ov5650_close,
 };

 static int ov5650_enum_fmt(struct v4l2_subdev *subdev,
 			   struct v4l2_subdev_fh *fh,
 			   struct v4l2_subdev_mbus_code_enum *code)
 {
 	if (code->index > 0)
 		return -EINVAL;

 	code->code = V4L2_MBUS_FMT_SGRBG10_1X10;
 	return 0;
 }

 static int ov5650_enum_framesizes(struct v4l2_subdev *subdev,
 				   struct v4l2_subdev_fh *fh,
 				   struct v4l2_subdev_frame_size_enum *fse)
 {
 	if (fse->index >= 1 || fse->code != V4L2_MBUS_FMT_SGRBG10_1X10)
 		return -EINVAL;

 	fse->min_width = ov5650_frmsizes[fse->index].width;
 	fse->max_width = fse->min_width;
 	fse->min_height = ov5650_frmsizes[fse->index].height;
 	fse->max_height = fse->min_height;

 	return 0;
 }

 static struct v4l2_subdev_core_ops ov5650_subdev_core_ops = {
 	.s_power	= ov5650_s_power,
 };

 static struct v4l2_subdev_video_ops ov5650_subdev_video_ops = {
 	.s_stream	= ov5650_s_stream,
 };

 static struct v4l2_subdev_pad_ops ov5650_subdev_pad_ops = {
 	.enum_mbus_code = ov5650_enum_fmt,
 	.enum_frame_size = ov5650_enum_framesizes,
 	.get_fmt = ov5650_g_fmt,
 	.set_fmt = ov5650_s_fmt,
 };

 static struct v4l2_subdev_ops ov5650_subdev_ops = {
 	.core	= &ov5650_subdev_core_ops,
 	.video	= &ov5650_subdev_video_ops,
 	.pad	= &ov5650_subdev_pad_ops,
 };

 static int ov5650_probe(struct i2c_client *client,
 			 const struct i2c_device_id *did)
 {
 	struct ov5650 *ov5650;
 	int ret;

 	if (!client->dev.platform_data) {
 		dev_err(&client->dev, "No platform data!!\n");
 		return -ENODEV;
 	}

 	ov5650 = kzalloc(sizeof(*ov5650), GFP_KERNEL);
 	if (!ov5650)
 		return -ENOMEM;

 	ov5650->pdata = client->dev.platform_data;

 	ov5650->format.code = V4L2_MBUS_FMT_SGRBG10_1X10;
 	ov5650->format.width = ov5650_frmsizes[OV5650_SIZE_5MP].width;
 	ov5650->format.height = ov5650_frmsizes[OV5650_SIZE_5MP].height;
 	ov5650->format.field = V4L2_FIELD_NONE;
 	ov5650->format.colorspace = V4L2_COLORSPACE_SRGB;

 	v4l2_i2c_subdev_init(&ov5650->subdev, client, &ov5650_subdev_ops);
 	ov5650->subdev.internal_ops = &ov5650_subdev_internal_ops;
 	ov5650->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

 	ov5650->pad.flags = MEDIA_PAD_FL_SOURCE;
 	ret = media_entity_init(&ov5650->subdev.entity, 1, &ov5650->pad, 0);

 	if (ret < 0) {
 		media_entity_cleanup(&ov5650->subdev.entity);
 		kfree(ov5650);
 	}

 	return ret;
 }

 static int ov5650_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 	struct ov5650 *ov5650 = to_ov5650(subdev);

 	v4l2_device_unregister_subdev(subdev);
 	media_entity_cleanup(&subdev->entity);
 	kfree(ov5650);
 	return 0;
 }

 static const struct i2c_device_id ov5650_id[] = {
 	{ "ov5650", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ov5650_id);

 static struct i2c_driver ov5650_i2c_driver = {
 	.driver = {
 		.name = "ov5650",
 	},
 	.probe		= ov5650_probe,
 	.remove		= ov5650_remove,
 	.id_table	= ov5650_id,
 };

 static int __init ov5650_mod_init(void)
 {
 	return i2c_add_driver(&ov5650_i2c_driver);
 }

 static void __exit ov5650_mod_exit(void)
 {
 	i2c_del_driver(&ov5650_i2c_driver);
 }

 module_init(ov5650_mod_init);
 module_exit(ov5650_mod_exit);

 MODULE_DESCRIPTION("OmniVision OV5650 Camera driver");
 MODULE_AUTHOR("Sergio Aguirre <saaguirre@ti.com>");
 MODULE_LICENSE("GPL v2");
	/*
	* OmniVision OV5650 sensor driver
	*
	* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
	*
	* 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 version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/videodev2.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/log2.h>
	#include <linux/delay.h>
	#include <linux/module.h>

	#include <media/v4l2-device.h>
	#include <media/v4l2-subdev.h>

	#include <media/ov5650.h>

	/* OV5650 has only one fixed colorspace per pixelcode */
	struct ov5650_datafmt {
	enum v4l2_mbus_pixelcode code;
	enum v4l2_colorspace colorspace;
	};

	enum ov5650_size {
	OV5650_SIZE_5MP,
	OV5650_SIZE_LAST,
	};

	static const struct v4l2_frmsize_discrete ov5650_frmsizes[OV5650_SIZE_LAST] = {
	{ 2592, 1944 },
	};

	struct ov5650 {
	struct v4l2_subdev subdev;
	struct media_pad pad;

	struct v4l2_mbus_framefmt format;

	const struct ov5650_platform_data *pdata;
	};

	static inline struct ov5650 to_ov5650(struct v4l2_subdev sd)
	{
	return container_of(sd, struct ov5650, subdev);
	}

	/**
	* struct ov5650_reg - ov5650 register format
	* @reg: 16-bit offset to register
	* @val: 8/16/32-bit register value
	* @length: length of the register
	*
	* Define a structure for OV5650 register initialization values
	*/
	struct ov5650_reg {
	u16 reg;
	u8 val;
	};

	/* TODO: Divide this properly */
	static const struct ov5650_reg configscript_5MP[] = {
	{ 0x3008, 0x82 },
	{ 0x3008, 0x42 },
	{ 0x3103, 0x93 },
	{ 0x3b07, 0x0c },
	{ 0x3017, 0xff },
	{ 0x3018, 0xfc },
	{ 0x3706, 0x41 },
	{ 0x3703, 0xe6 },
	{ 0x3613, 0x44 },
	{ 0x3630, 0x22 },
	{ 0x3605, 0x04 },
	{ 0x3606, 0x3f },
	{ 0x3712, 0x13 },
	{ 0x370e, 0x00 },
	{ 0x370b, 0x40 },
	{ 0x3600, 0x54 },
	{ 0x3601, 0x05 },
	{ 0x3713, 0x22 },
	{ 0x3714, 0x27 },
	{ 0x3631, 0x22 },
	{ 0x3612, 0x1a },
	{ 0x3604, 0x40 },
	{ 0x3705, 0xda },
	{ 0x370a, 0x80 },
	{ 0x370c, 0x00 },
	{ 0x3710, 0x28 },
	{ 0x3702, 0x3a },
	{ 0x3704, 0x18 },
	{ 0x3a18, 0x00 },
	{ 0x3a19, 0xf8 },
	{ 0x3a00, 0x38 },
	{ 0x3800, 0x02 },
	{ 0x3801, 0x54 },
	{ 0x3803, 0x0c },
	{ 0x3808, 0x0a },
	{ 0x3809, 0x20 },
	{ 0x380a, 0x07 },
	{ 0x380b, 0x98 },
	{ 0x380c, 0x0c },
	{ 0x380d, 0xb4 },
	{ 0x380e, 0x07 },
	{ 0x380f, 0xb0 },
	{ 0x3830, 0x50 },
	{ 0x3a08, 0x12 },
	{ 0x3a09, 0x70 },
	{ 0x3a0a, 0x0f },
	{ 0x3a0b, 0x60 },
	{ 0x3a0d, 0x06 },
	{ 0x3a0e, 0x06 },
	{ 0x3a13, 0x54 },
	{ 0x3815, 0x82 },
	{ 0x5059, 0x80 },
	{ 0x505a, 0x0a },
	{ 0x505b, 0x2e },
	{ 0x3a1a, 0x06 },
	{ 0x3503, 0x00 },
	{ 0x3623, 0x01 },
	{ 0x3633, 0x24 },
	{ 0x3c01, 0x34 },
	{ 0x3c04, 0x28 },
	{ 0x3c05, 0x98 },
	{ 0x3c07, 0x07 },
	{ 0x3c09, 0xc2 },
	{ 0x4000, 0x05 },
	{ 0x401d, 0x28 },
	{ 0x4001, 0x02 },
	{ 0x401c, 0x46 },
	{ 0x5046, 0x01 },
	{ 0x3810, 0x40 },
	{ 0x3836, 0x41 },
	{ 0x505f, 0x04 },
	{ 0x5000, 0x00 },
	{ 0x5001, 0x00 },
	{ 0x5002, 0x00 },
	{ 0x503d, 0x00 },
	{ 0x5901, 0x00 },
	{ 0x585a, 0x01 },
	{ 0x585b, 0x2c },
	{ 0x585c, 0x01 },
	{ 0x585d, 0x93 },
	{ 0x585e, 0x01 },
	{ 0x585f, 0x90 },
	{ 0x5860, 0x01 },
	{ 0x5861, 0x0d },
	{ 0x5180, 0xc0 },
	{ 0x5184, 0x00 },
	{ 0x470a, 0x00 },
	{ 0x470b, 0x00 },
	{ 0x470c, 0x00 },
	{ 0x300f, 0x8e },
	{ 0x3603, 0xa7 },
	{ 0x3615, 0x50 },
	{ 0x3632, 0x55 },
	{ 0x3620, 0x56 },
	{ 0x3621, 0x2f },
	{ 0x381a, 0x3c },
	{ 0x3818, 0xc0 },
	{ 0x3631, 0x36 },
	{ 0x3632, 0x5f },
	{ 0x3711, 0x24 },
	{ 0x401f, 0x03 },
	{ 0x3011, 0x14 },
	{ 0x3007, 0x3b },
	{ 0x4801, 0x0f },
	{ 0x3003, 0x03 },
	{ 0x300e, 0x0c },
	{ 0x4803, 0x50 },
	{ 0x4800, 0x04 },
	{ 0x300f, 0x8f },
	{ 0x3815, 0x82 },
	{ 0x3003, 0x01 },
	{ 0x3008, 0x02 },
	};

	/**
	* ov5650_reg_read - Read a value from a register in an ov5650 sensor device
	* @client: i2c driver client structure
	* @reg: register address / offset
	* @val: stores the value that gets read
	*
	* Read a value from a register in an ov5650 sensor device.
	* The value is returned in 'val'.
	* Returns zero if successful, or non-zero otherwise.
	*/
	static int ov5650_reg_read(struct i2c_client client, u16 reg, u8 val)
	{
	int ret;
	u8 data[2] = {0};
	struct i2c_msg msg = {
	.addr = client->addr,
	.flags = 0,
	.len = 2,
	.buf = data,
	};

	data[0] = (u8)(reg >> 8);
	data[1] = (u8)(reg & 0xff);

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0)
	goto err;

	msg.flags = I2C_M_RD;
	msg.len = 1;
	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0)
	goto err;

	*val = data[0];
	return 0;

	err:
	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
	return ret;
	}

	/**
	* Write a value to a register in ov5650 sensor device.
	* @client: i2c driver client structure.
	* @reg: Address of the register to read value from.
	* @val: Value to be written to a specific register.
	* Returns zero if successful, or non-zero otherwise.
	*/
	static int ov5650_reg_write(struct i2c_client *client, u16 reg, u8 val)
	{
	int ret;
	unsigned char data[3] = { (u8)(reg >> 8), (u8)(reg & 0xff), val };
	struct i2c_msg msg = {
	.addr = client->addr,
	.flags = 0,
	.len = 3,
	.buf = data,
	};

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0) {
	dev_err(&client->dev, "Failed writing register 0x%02x!\n", reg);
	return ret;
	}

	return 0;
	}

	/**
	* Initialize a list of ov5650 registers.
	* The list of registers is terminated by the pair of values
	* @client: i2c driver client structure.
	* @reglist[]: List of address of the registers to write data.
	* Returns zero if successful, or non-zero otherwise.
	*/
	static int ov5650_reg_writes(struct i2c_client *client,
	const struct ov5650_reg reglist[],
	int size)
	{
	int err = 0, i;

	for (i = 0; i < size; i++) {
	err = ov5650_reg_write(client, reglist[i].reg,
	reglist[i].val);
	if (err)
	return err;
	}
	return 0;
	}

	static struct v4l2_mbus_framefmt *
	__ov5650_get_pad_format(struct ov5650 ov5650, struct v4l2_subdev_fh fh,
	unsigned int pad, enum v4l2_subdev_format_whence which)
	{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
	return v4l2_subdev_get_try_format(fh, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
	return &ov5650->format;
	default:
	return NULL;
	}
	}

	/* -----------------------------------------------------------------------------
	* V4L2 subdev internal operations
	*/

	static int ov5650_s_power(struct v4l2_subdev *sd, int on)
	{
	struct ov5650 *ov5650 = to_ov5650(sd);

	return ov5650->pdata->s_power(sd, on);
	}

	static int ov5650_registered(struct v4l2_subdev *subdev)
	{
	struct i2c_client *client = v4l2_get_subdevdata(subdev);
	int ret = 0;
	u8 revision = 0;

	ret = ov5650_s_power(subdev, 1);
	if (ret < 0) {
	dev_err(&client->dev, "OV5650 power up failed\n");
	return ret;
	}

	ret = ov5650_reg_read(client, 0x302A, &revision);
	if (ret) {
	dev_err(&client->dev, "Failure to detect OV5650 chip\n");
	goto out;
	}

	revision &= 0xF;

	dev_info(&client->dev, "Detected a OV5650 chip, revision %x\n",
	revision);

	out:
	ov5650_s_power(subdev, 0);

	return ret;
	}

	static int ov5650_open(struct v4l2_subdev subdev, struct v4l2_subdev_fh fh)
	{
	struct v4l2_mbus_framefmt *format;

	format = v4l2_subdev_get_try_format(fh, 0);
	format->code = V4L2_MBUS_FMT_SGRBG10_1X10;
	format->width = ov5650_frmsizes[OV5650_SIZE_5MP].width;
	format->height = ov5650_frmsizes[OV5650_SIZE_5MP].height;
	format->field = V4L2_FIELD_NONE;
	format->colorspace = V4L2_COLORSPACE_SRGB;

	return 0;
	}

	static int ov5650_close(struct v4l2_subdev subdev, struct v4l2_subdev_fh fh)
	{
	return 0;
	}

	static int ov5650_s_stream(struct v4l2_subdev *sd, int enable)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret = 0;

	if (enable) {
	/* HACK: Hardcoding to 5MP! */
	ret = ov5650_reg_writes(client, configscript_5MP,
	ARRAY_SIZE(configscript_5MP));
	}

	return ret;
	}

	static int ov5650_g_fmt(struct v4l2_subdev *sd,
	struct v4l2_subdev_fh *fh,
	struct v4l2_subdev_format *format)
	{
	struct ov5650 *ov5650 = to_ov5650(sd);

	format->format = *__ov5650_get_pad_format(ov5650, fh, format->pad,
	format->which);

	return 0;
	}

	static int ov5650_s_fmt(struct v4l2_subdev *sd,
	struct v4l2_subdev_fh *fh,
	struct v4l2_subdev_format *format)
	{
	struct ov5650 *ov5650 = to_ov5650(sd);
	struct v4l2_mbus_framefmt *__format;

	__format = __ov5650_get_pad_format(ov5650, fh, format->pad,
	format->which);

	/* FIXME: Do an actual change! */
	format->format = *__format;

	return 0;
	}

	static struct v4l2_subdev_internal_ops ov5650_subdev_internal_ops = {
	.registered = ov5650_registered,
	.open = ov5650_open,
	.close = ov5650_close,
	};

	static int ov5650_enum_fmt(struct v4l2_subdev *subdev,
	struct v4l2_subdev_fh *fh,
	struct v4l2_subdev_mbus_code_enum *code)
	{
	if (code->index > 0)
	return -EINVAL;

	code->code = V4L2_MBUS_FMT_SGRBG10_1X10;
	return 0;
	}

	static int ov5650_enum_framesizes(struct v4l2_subdev *subdev,
	struct v4l2_subdev_fh *fh,
	struct v4l2_subdev_frame_size_enum *fse)
	{
	if (fse->index >= 1 \|\| fse->code != V4L2_MBUS_FMT_SGRBG10_1X10)
	return -EINVAL;

	fse->min_width = ov5650_frmsizes[fse->index].width;
	fse->max_width = fse->min_width;
	fse->min_height = ov5650_frmsizes[fse->index].height;
	fse->max_height = fse->min_height;

	return 0;
	}

	static struct v4l2_subdev_core_ops ov5650_subdev_core_ops = {
	.s_power = ov5650_s_power,
	};

	static struct v4l2_subdev_video_ops ov5650_subdev_video_ops = {
	.s_stream = ov5650_s_stream,
	};

	static struct v4l2_subdev_pad_ops ov5650_subdev_pad_ops = {
	.enum_mbus_code = ov5650_enum_fmt,
	.enum_frame_size = ov5650_enum_framesizes,
	.get_fmt = ov5650_g_fmt,
	.set_fmt = ov5650_s_fmt,
	};

	static struct v4l2_subdev_ops ov5650_subdev_ops = {
	.core = &ov5650_subdev_core_ops,
	.video = &ov5650_subdev_video_ops,
	.pad = &ov5650_subdev_pad_ops,
	};

	static int ov5650_probe(struct i2c_client *client,
	const struct i2c_device_id *did)
	{
	struct ov5650 *ov5650;
	int ret;

	if (!client->dev.platform_data) {
	dev_err(&client->dev, "No platform data!!\n");
	return -ENODEV;
	}

	ov5650 = kzalloc(sizeof(*ov5650), GFP_KERNEL);
	if (!ov5650)
	return -ENOMEM;

	ov5650->pdata = client->dev.platform_data;

	ov5650->format.code = V4L2_MBUS_FMT_SGRBG10_1X10;
	ov5650->format.width = ov5650_frmsizes[OV5650_SIZE_5MP].width;
	ov5650->format.height = ov5650_frmsizes[OV5650_SIZE_5MP].height;
	ov5650->format.field = V4L2_FIELD_NONE;
	ov5650->format.colorspace = V4L2_COLORSPACE_SRGB;

	v4l2_i2c_subdev_init(&ov5650->subdev, client, &ov5650_subdev_ops);
	ov5650->subdev.internal_ops = &ov5650_subdev_internal_ops;
	ov5650->subdev.flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;

	ov5650->pad.flags = MEDIA_PAD_FL_SOURCE;
	ret = media_entity_init(&ov5650->subdev.entity, 1, &ov5650->pad, 0);

	if (ret < 0) {
	media_entity_cleanup(&ov5650->subdev.entity);
	kfree(ov5650);
	}

	return ret;
	}

	static int ov5650_remove(struct i2c_client *client)
	{
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct ov5650 *ov5650 = to_ov5650(subdev);

	v4l2_device_unregister_subdev(subdev);
	media_entity_cleanup(&subdev->entity);
	kfree(ov5650);
	return 0;
	}

	static const struct i2c_device_id ov5650_id[] = {
	{ "ov5650", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, ov5650_id);

	static struct i2c_driver ov5650_i2c_driver = {
	.driver = {
	.name = "ov5650",
	},
	.probe = ov5650_probe,
	.remove = ov5650_remove,
	.id_table = ov5650_id,
	};

	static int __init ov5650_mod_init(void)
	{
	return i2c_add_driver(&ov5650_i2c_driver);
	}

	static void __exit ov5650_mod_exit(void)
	{
	i2c_del_driver(&ov5650_i2c_driver);
	}

	module_init(ov5650_mod_init);
	module_exit(ov5650_mod_exit);

	MODULE_DESCRIPTION("OmniVision OV5650 Camera driver");
	MODULE_AUTHOR("Sergio Aguirre <saaguirre@ti.com>");
	MODULE_LICENSE("GPL v2");