/*
 * 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.\n");

        /* 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.\n");

        /* 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.\n");

        /* 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.\n");

        /* 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]);
}