/*
 * Copyright (C) 2005-2006 Micronas USA Inc.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <linux/ioctl.h>
#include <linux/slab.h>

#include "wis-i2c.h"

struct wis_tw2804 {
	int channel;
	int norm;
	int brightness;
	int contrast;
	int saturation;
	int hue;
};

static u8 global_registers[] = {
	0x39, 0x00,
	0x3a, 0xff,
	0x3b, 0x84,
	0x3c, 0x80,
	0x3d, 0x80,
	0x3e, 0x82,
	0x3f, 0x82,
	0xff, 0xff, /* Terminator (reg 0xff does not exist) */
};

static u8 channel_registers[] = {
	0x01, 0xc4,
	0x02, 0xa5,
	0x03, 0x20,
	0x04, 0xd0,
	0x05, 0x20,
	0x06, 0xd0,
	0x07, 0x88,
	0x08, 0x20,
	0x09, 0x07,
	0x0a, 0xf0,
	0x0b, 0x07,
	0x0c, 0xf0,
	0x0d, 0x40,
	0x0e, 0xd2,
	0x0f, 0x80,
	0x10, 0x80,
	0x11, 0x80,
	0x12, 0x80,
	0x13, 0x1f,
	0x14, 0x00,
	0x15, 0x00,
	0x16, 0x00,
	0x17, 0x00,
	0x18, 0xff,
	0x19, 0xff,
	0x1a, 0xff,
	0x1b, 0xff,
	0x1c, 0xff,
	0x1d, 0xff,
	0x1e, 0xff,
	0x1f, 0xff,
	0x20, 0x07,
	0x21, 0x07,
	0x22, 0x00,
	0x23, 0x91,
	0x24, 0x51,
	0x25, 0x03,
	0x26, 0x00,
	0x27, 0x00,
	0x28, 0x00,
	0x29, 0x00,
	0x2a, 0x00,
	0x2b, 0x00,
	0x2c, 0x00,
	0x2d, 0x00,
	0x2e, 0x00,
	0x2f, 0x00,
	0x30, 0x00,
	0x31, 0x00,
	0x32, 0x00,
	0x33, 0x00,
	0x34, 0x00,
	0x35, 0x00,
	0x36, 0x00,
	0x37, 0x00,
	0xff, 0xff, /* Terminator (reg 0xff does not exist) */
};

static int write_reg(struct i2c_client *client, u8 reg, u8 value, int channel)
{
	return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
}

static int write_regs(struct i2c_client *client, u8 *regs, int channel)
{
	int i;

	for (i = 0; regs[i] != 0xff; i += 2)
		if (i2c_smbus_write_byte_data(client,
				regs[i] | (channel << 6), regs[i + 1]) < 0)
			return -1;
	return 0;
}

static int wis_tw2804_command(struct i2c_client *client,
				unsigned int cmd, void *arg)
{
	struct wis_tw2804 *dec = i2c_get_clientdata(client);

	if (cmd == DECODER_SET_CHANNEL) {
		int *input = arg;

		if (*input < 0 || *input > 3) {
			dev_err(&client->dev,
				"channel %d is not between 0 and 3!\n", *input);
			return 0;
		}
		dec->channel = *input;
		dev_dbg(&client->dev, "initializing TW2804 channel %d\n",
			dec->channel);
		if (dec->channel == 0 &&
				write_regs(client, global_registers, 0) < 0) {
			dev_err(&client->dev,
				"error initializing TW2804 global registers\n");
			return 0;
		}
		if (write_regs(client, channel_registers, dec->channel) < 0) {
			dev_err(&client->dev,
				"error initializing TW2804 channel %d\n",
				dec->channel);
			return 0;
		}
		return 0;
	}

	if (dec->channel < 0) {
		dev_dbg(&client->dev,
			"ignoring command %08x until channel number is set\n",
			cmd);
		return 0;
	}

	switch (cmd) {
	case VIDIOC_S_STD:
	{
		v4l2_std_id *input = arg;
		u8 regs[] = {
			0x01, *input & V4L2_STD_NTSC ? 0xc4 : 0x84,
			0x09, *input & V4L2_STD_NTSC ? 0x07 : 0x04,
			0x0a, *input & V4L2_STD_NTSC ? 0xf0 : 0x20,
			0x0b, *input & V4L2_STD_NTSC ? 0x07 : 0x04,
			0x0c, *input & V4L2_STD_NTSC ? 0xf0 : 0x20,
			0x0d, *input & V4L2_STD_NTSC ? 0x40 : 0x4a,
			0x16, *input & V4L2_STD_NTSC ? 0x00 : 0x40,
			0x17, *input & V4L2_STD_NTSC ? 0x00 : 0x40,
			0x20, *input & V4L2_STD_NTSC ? 0x07 : 0x0f,
			0x21, *input & V4L2_STD_NTSC ? 0x07 : 0x0f,
			0xff,	0xff,
		};
		write_regs(client, regs, dec->channel);
		dec->norm = *input;
		break;
	}
	case VIDIOC_QUERYCTRL:
	{
		struct v4l2_queryctrl *ctrl = arg;

		switch (ctrl->id) {
		case V4L2_CID_BRIGHTNESS:
			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
			strncpy(ctrl->name, "Brightness", sizeof(ctrl->name));
			ctrl->minimum = 0;
			ctrl->maximum = 255;
			ctrl->step = 1;
			ctrl->default_value = 128;
			ctrl->flags = 0;
			break;
		case V4L2_CID_CONTRAST:
			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
			strncpy(ctrl->name, "Contrast", sizeof(ctrl->name));
			ctrl->minimum = 0;
			ctrl->maximum = 255;
			ctrl->step = 1;
			ctrl->default_value = 128;
			ctrl->flags = 0;
			break;
		case V4L2_CID_SATURATION:
			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
			strncpy(ctrl->name, "Saturation", sizeof(ctrl->name));
			ctrl->minimum = 0;
			ctrl->maximum = 255;
			ctrl->step = 1;
			ctrl->default_value = 128;
			ctrl->flags = 0;
			break;
		case V4L2_CID_HUE:
			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
			strncpy(ctrl->name, "Hue", sizeof(ctrl->name));
			ctrl->minimum = 0;
			ctrl->maximum = 255;
			ctrl->step = 1;
			ctrl->default_value = 128;
			ctrl->flags = 0;
			break;
		}
		break;
	}
	case VIDIOC_S_CTRL:
	{
		struct v4l2_control *ctrl = arg;

		switch (ctrl->id) {
		case V4L2_CID_BRIGHTNESS:
			if (ctrl->value > 255)
				dec->brightness = 255;
			else if (ctrl->value < 0)
				dec->brightness = 0;
			else
				dec->brightness = ctrl->value;
			write_reg(client, 0x12, dec->brightness, dec->channel);
			break;
		case V4L2_CID_CONTRAST:
			if (ctrl->value > 255)
				dec->contrast = 255;
			else if (ctrl->value < 0)
				dec->contrast = 0;
			else
				dec->contrast = ctrl->value;
			write_reg(client, 0x11, dec->contrast, dec->channel);
			break;
		case V4L2_CID_SATURATION:
			if (ctrl->value > 255)
				dec->saturation = 255;
			else if (ctrl->value < 0)
				dec->saturation = 0;
			else
				dec->saturation = ctrl->value;
			write_reg(client, 0x10, dec->saturation, dec->channel);
			break;
		case V4L2_CID_HUE:
			if (ctrl->value > 255)
				dec->hue = 255;
			else if (ctrl->value < 0)
				dec->hue = 0;
			else
				dec->hue = ctrl->value;
			write_reg(client, 0x0f, dec->hue, dec->channel);
			break;
		}
		break;
	}
	case VIDIOC_G_CTRL:
	{
		struct v4l2_control *ctrl = arg;

		switch (ctrl->id) {
		case V4L2_CID_BRIGHTNESS:
			ctrl->value = dec->brightness;
			break;
		case V4L2_CID_CONTRAST:
			ctrl->value = dec->contrast;
			break;
		case V4L2_CID_SATURATION:
			ctrl->value = dec->saturation;
			break;
		case V4L2_CID_HUE:
			ctrl->value = dec->hue;
			break;
		}
		break;
	}
	default:
		break;
	}
	return 0;
}

static int wis_tw2804_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct wis_tw2804 *dec;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	dec = kmalloc(sizeof(struct wis_tw2804), GFP_KERNEL);
	if (dec == NULL)
		return -ENOMEM;

	dec->channel = -1;
	dec->norm = V4L2_STD_NTSC;
	dec->brightness = 128;
	dec->contrast = 128;
	dec->saturation = 128;
	dec->hue = 128;
	i2c_set_clientdata(client, dec);

	dev_dbg(&client->dev, "creating TW2804 at address %d on %s\n",
		client->addr, adapter->name);

	return 0;
}

static int wis_tw2804_remove(struct i2c_client *client)
{
	struct wis_tw2804 *dec = i2c_get_clientdata(client);

	kfree(dec);
	return 0;
}

static const struct i2c_device_id wis_tw2804_id[] = {
	{ "wis_tw2804", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wis_tw2804_id);

static struct i2c_driver wis_tw2804_driver = {
	.driver = {
		.name	= "WIS TW2804 I2C driver",
	},
	.probe		= wis_tw2804_probe,
	.remove		= wis_tw2804_remove,
	.command	= wis_tw2804_command,
	.id_table	= wis_tw2804_id,
};

module_i2c_driver(wis_tw2804_driver);

MODULE_LICENSE("GPL v2");