/*
 * FB driver for the uPD161704 LCD Controller
 *
 * Copyright (C) 2014 Seong-Woo Kim
 *
 * Based on fb_ili9325.c by Noralf Tronnes
 * Based on ili9325.c by Jeroen Domburg
 * Init code from UTFT library by Henning Karlsen
 *
 * 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 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/delay.h>

#include "fbtft.h"

#define DRVNAME		"fb_bd663474"
#define WIDTH		240
#define HEIGHT		320
#define BPP		16

static int init_display(struct fbtft_par *par)
{
	fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);

	if (par->gpio.cs != -1)
		gpio_set_value(par->gpio.cs, 0);  /* Activate chip */

	par->fbtftops.reset(par);

	/* Initialization sequence from Lib_UTFT */

	/* oscillator start */
	write_reg(par, 0x000,0x0001);	/*oscillator 0: stop, 1: operation */
	mdelay(10);

	/* Power settings */
	write_reg(par, 0x100, 0x0000 ); /* power supply setup */
	write_reg(par, 0x101, 0x0000 );
	write_reg(par, 0x102, 0x3110 );
	write_reg(par, 0x103, 0xe200 );
	write_reg(par, 0x110, 0x009d );
	write_reg(par, 0x111, 0x0022 );
	write_reg(par, 0x100, 0x0120 );
	mdelay( 20 );

	write_reg(par, 0x100, 0x3120 );
	mdelay( 80 );
	/* Display control */
	write_reg(par, 0x001, 0x0100 );
	write_reg(par, 0x002, 0x0000 );
	write_reg(par, 0x003, 0x1230 );
	write_reg(par, 0x006, 0x0000 );
	write_reg(par, 0x007, 0x0101 );
	write_reg(par, 0x008, 0x0808 );
	write_reg(par, 0x009, 0x0000 );
	write_reg(par, 0x00b, 0x0000 );
	write_reg(par, 0x00c, 0x0000 );
	write_reg(par, 0x00d, 0x0018 );
	/* LTPS control settings */
	write_reg(par, 0x012, 0x0000 );
	write_reg(par, 0x013, 0x0000 );
	write_reg(par, 0x018, 0x0000 );
	write_reg(par, 0x019, 0x0000 );

	write_reg(par, 0x203, 0x0000 );
	write_reg(par, 0x204, 0x0000 );

	write_reg(par, 0x210, 0x0000 );
	write_reg(par, 0x211, 0x00ef );
	write_reg(par, 0x212, 0x0000 );
	write_reg(par, 0x213, 0x013f );
	write_reg(par, 0x214, 0x0000 );
	write_reg(par, 0x215, 0x0000 );
	write_reg(par, 0x216, 0x0000 );
	write_reg(par, 0x217, 0x0000 );

	/* Gray scale settings */
	write_reg(par, 0x300, 0x5343);
	write_reg(par, 0x301, 0x1021);
	write_reg(par, 0x302, 0x0003);
	write_reg(par, 0x303, 0x0011);
	write_reg(par, 0x304, 0x050a);
	write_reg(par, 0x305, 0x4342);
	write_reg(par, 0x306, 0x1100);
	write_reg(par, 0x307, 0x0003);
	write_reg(par, 0x308, 0x1201);
	write_reg(par, 0x309, 0x050a);

	/* RAM access settings */
	write_reg(par, 0x400, 0x4027 );
	write_reg(par, 0x401, 0x0000 );
	write_reg(par, 0x402, 0x0000 );  /* First screen drive position (1) */
	write_reg(par, 0x403, 0x013f );  /* First screen drive position (2) */
	write_reg(par, 0x404, 0x0000 );

	write_reg(par, 0x200, 0x0000 );
	write_reg(par, 0x201, 0x0000 );
	write_reg(par, 0x100, 0x7120 );
	write_reg(par, 0x007, 0x0103 );
	mdelay( 10 );
	write_reg(par, 0x007, 0x0113 );

	return 0;
}

static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
		"%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
	switch (par->info->var.rotate) {
	/* R200h = Horizontal GRAM Start Address */
	/* R201h = Vertical GRAM Start Address */
	case 0:
		write_reg(par, 0x0200, xs);
		write_reg(par, 0x0201, ys);
		break;
	case 180:
		write_reg(par, 0x0200, WIDTH - 1 - xs);
		write_reg(par, 0x0201, HEIGHT - 1 - ys);
		break;
	case 270:
		write_reg(par, 0x0200, WIDTH - 1 - ys);
		write_reg(par, 0x0201, xs);
		break;
	case 90:
		write_reg(par, 0x0200, ys);
		write_reg(par, 0x0201, HEIGHT - 1 - xs);
		break;
	}
	write_reg(par, 0x202); /* Write Data to GRAM */
}

static int set_var(struct fbtft_par *par)
{
	fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);

	switch (par->info->var.rotate) {
	/* AM: GRAM update direction */
	case 0:
		write_reg(par, 0x003, 0x1230);
		break;
	case 180:
		write_reg(par, 0x003, 0x1200);
		break;
	case 270:
		write_reg(par, 0x003, 0x1228);
		break;
	case 90:
		write_reg(par, 0x003, 0x1218);
		break;
	}

	return 0;
}

static struct fbtft_display display = {
	.regwidth = 16,
	.width = WIDTH,
	.height = HEIGHT,
	.bpp = BPP,
	.fbtftops = {
		.init_display = init_display,
		.set_addr_win = set_addr_win,
		.set_var = set_var,
	},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "hitachi,bd663474", &display);

MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:bd663474");
MODULE_ALIAS("platform:bd663474");

MODULE_DESCRIPTION("FB driver for the uPD161704 LCD Controller");
MODULE_AUTHOR("Seong-Woo Kim");
MODULE_LICENSE("GPL");