/*
   * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
   * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
  
   * 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, or (at your option) any later version.
  
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; 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/via-core.h>
  #include <linux/via_i2c.h>
  #include "global.h"
  
  static const struct IODATA common_init_data[] = {
  /*  Index, Mask, Value */
  	/* Set panel power sequence timing */
  	{0x10, 0xC0, 0x00},
  	/* T1: VDD on - Data on. Each increment is 1 ms. (50ms = 031h) */
  	{0x0B, 0xFF, 0x40},
  	/* T2: Data on - Backlight on. Each increment is 2 ms. (210ms = 068h) */
  	{0x0C, 0xFF, 0x31},
  	/* T3: Backlight off -Data off. Each increment is 2 ms. (210ms = 068h)*/
  	{0x0D, 0xFF, 0x31},
  	/* T4: Data off - VDD off. Each increment is 1 ms. (50ms = 031h) */
  	{0x0E, 0xFF, 0x68},
  	/* T5: VDD off - VDD on. Each increment is 100 ms. (500ms = 04h) */
  	{0x0F, 0xFF, 0x68},
  	/* LVDS output power up */
  	{0x09, 0xA0, 0xA0},
  	/* turn on back light */
  	{0x10, 0x33, 0x13}
  };
  
  /* Index, Mask, Value */
  static const struct IODATA dual_channel_enable_data = {0x08, 0xF0, 0xE0};
  static const struct IODATA single_channel_enable_data = {0x08, 0xF0, 0x00};
  static const struct IODATA dithering_enable_data = {0x0A, 0x70, 0x50};
  static const struct IODATA dithering_disable_data = {0x0A, 0x70, 0x00};
  static const struct IODATA vdd_on_data = {0x10, 0x20, 0x20};
  static const struct IODATA vdd_off_data = {0x10, 0x20, 0x00};
  
  u8 viafb_gpio_i2c_read_lvds(struct lvds_setting_information
  	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
  	u8 index)
  {
  	u8 data;
  
  	viafb_i2c_readbyte(plvds_chip_info->i2c_port,
  			   plvds_chip_info->lvds_chip_slave_addr, index, &data);
  	return data;
  }
  
  void viafb_gpio_i2c_write_mask_lvds(struct lvds_setting_information
  			      *plvds_setting_info, struct lvds_chip_information
  			      *plvds_chip_info, struct IODATA io_data)
  {
  	int index, data;
  
  	index = io_data.Index;
  	data = viafb_gpio_i2c_read_lvds(plvds_setting_info, plvds_chip_info,
  		index);
  	data = (data & (~io_data.Mask)) | io_data.Data;
  
  	viafb_i2c_writebyte(plvds_chip_info->i2c_port,
  			    plvds_chip_info->lvds_chip_slave_addr, index, data);
  }
  
  void viafb_init_lvds_vt1636(struct lvds_setting_information
  	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info)
  {
  	int reg_num, i;
  
  	/* Common settings: */
  	reg_num = ARRAY_SIZE(common_init_data);
  	for (i = 0; i < reg_num; i++)
  		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  			plvds_chip_info, common_init_data[i]);
  
  	/* Input Data Mode Select */
  	if (plvds_setting_info->device_lcd_dualedge)
  		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  			plvds_chip_info, dual_channel_enable_data);
  	else
  		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  			plvds_chip_info, single_channel_enable_data);
  
  	if (plvds_setting_info->LCDDithering)
  		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  			plvds_chip_info, dithering_enable_data);
  	else
  		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  			plvds_chip_info, dithering_disable_data);
  }
  
  void viafb_enable_lvds_vt1636(struct lvds_setting_information
  			*plvds_setting_info,
  			struct lvds_chip_information *plvds_chip_info)
  {
  	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
  		vdd_on_data);
  }
  
  void viafb_disable_lvds_vt1636(struct lvds_setting_information
  			 *plvds_setting_info,
  			 struct lvds_chip_information *plvds_chip_info)
  {
  	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
  		vdd_off_data);
  }
  
  bool viafb_lvds_identify_vt1636(u8 i2c_adapter)
  {
  	u8 Buffer[2];
  
  	DEBUG_MSG(KERN_INFO "viafb_lvds_identify_vt1636.
  ");
  
  	/* Sense VT1636 LVDS Transmiter */
  	viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr =
  		VT1636_LVDS_I2C_ADDR;
  
  	/* Check vendor ID first: */
  	if (viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR,
  					0x00, &Buffer[0]))
  		return false;
  	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x01, &Buffer[1]);
  
  	if (!((Buffer[0] == 0x06) && (Buffer[1] == 0x11)))
  		return false;
  
  	/* Check Chip ID: */
  	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x02, &Buffer[0]);
  	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x03, &Buffer[1]);
  	if ((Buffer[0] == 0x45) && (Buffer[1] == 0x33)) {
  		viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
  			VT1636_LVDS;
  		return true;
  	}
  
  	return false;
  }
  
  static int get_clk_range_index(u32 Clk)
  {
  	if (Clk < DPA_CLK_30M)
  		return DPA_CLK_RANGE_30M;
  	else if (Clk < DPA_CLK_50M)
  		return DPA_CLK_RANGE_30_50M;
  	else if (Clk < DPA_CLK_70M)
  		return DPA_CLK_RANGE_50_70M;
  	else if (Clk < DPA_CLK_100M)
  		return DPA_CLK_RANGE_70_100M;
  	else if (Clk < DPA_CLK_150M)
  		return DPA_CLK_RANGE_100_150M;
  	else
  		return DPA_CLK_RANGE_150M;
  }
  
  static void set_dpa_vt1636(struct lvds_setting_information
  	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
  		    struct VT1636_DPA_SETTING *p_vt1636_dpa_setting)
  {
  	struct IODATA io_data;
  
  	io_data.Index = 0x09;
  	io_data.Mask = 0x1F;
  	io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST1;
  	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  		plvds_chip_info, io_data);
  
  	io_data.Index = 0x08;
  	io_data.Mask = 0x0F;
  	io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST2;
  	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
  		io_data);
  }
  
  void viafb_vt1636_patch_skew_on_vt3324(
  	struct lvds_setting_information *plvds_setting_info,
  	struct lvds_chip_information *plvds_chip_info)
  {
  	struct VT1636_DPA_SETTING dpa = {0x00, 0x00}, dpa_16x12 = {0x0B, 0x03},
  		*pdpa;
  	int index;
  
  	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3324.
  ");
  
  	/* Graphics DPA settings: */
  	index = get_clk_range_index(plvds_setting_info->vclk);
  	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
  		    &GFX_DPA_SETTING_TBL_VT3324[index]);
  
  	/* LVDS Transmitter DPA settings: */
  	if (plvds_setting_info->lcd_panel_hres == 1600 &&
  		plvds_setting_info->lcd_panel_vres == 1200)
  		pdpa = &dpa_16x12;
  	else
  		pdpa = &dpa;
  
  	set_dpa_vt1636(plvds_setting_info, plvds_chip_info, pdpa);
  }
  
  void viafb_vt1636_patch_skew_on_vt3327(
  	struct lvds_setting_information *plvds_setting_info,
  	struct lvds_chip_information *plvds_chip_info)
  {
  	struct VT1636_DPA_SETTING dpa = {0x00, 0x00};
  	int index;
  
  	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3327.
  ");
  
  	/* Graphics DPA settings: */
  	index = get_clk_range_index(plvds_setting_info->vclk);
  	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
  		    &GFX_DPA_SETTING_TBL_VT3327[index]);
  
  	/* LVDS Transmitter DPA settings: */
  	set_dpa_vt1636(plvds_setting_info, plvds_chip_info, &dpa);
  }
  
  void viafb_vt1636_patch_skew_on_vt3364(
  	struct lvds_setting_information *plvds_setting_info,
  	struct lvds_chip_information *plvds_chip_info)
  {
  	int index;
  
  	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3364.
  ");
  
  	/* Graphics DPA settings: */
  	index = get_clk_range_index(plvds_setting_info->vclk);
  	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
  		    &GFX_DPA_SETTING_TBL_VT3364[index]);
  }