// SPDX-License-Identifier: GPL-2.0+
/*
 * Custom FB driver for tinylcd.com display
 *
 * Copyright (C) 2013 Noralf Tronnes
 */

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

#include "fbtft.h"

#define DRVNAME         "fb_tinylcd"
#define WIDTH           320
#define HEIGHT          480

static int init_display(struct fbtft_par *par)
{
        par->fbtftops.reset(par);

        write_reg(par, 0xB0, 0x80);
        write_reg(par, 0xC0, 0x0A, 0x0A);
        write_reg(par, 0xC1, 0x45, 0x07);
        write_reg(par, 0xC2, 0x33);
        write_reg(par, 0xC5, 0x00, 0x42, 0x80);
        write_reg(par, 0xB1, 0xD0, 0x11);
        write_reg(par, 0xB4, 0x02);
        write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
        write_reg(par, 0xB7, 0x07);
        write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
        write_reg(par, 0xF0, 0x36, 0xA5, 0xD3);
        write_reg(par, 0xE5, 0x80);
        write_reg(par, 0xE5, 0x01);
        write_reg(par, 0xB3, 0x00);
        write_reg(par, 0xE5, 0x00);
        write_reg(par, 0xF0, 0x36, 0xA5, 0x53);
        write_reg(par, 0xE0, 0x00, 0x35, 0x33, 0x00, 0x00, 0x00,
                       0x00, 0x35, 0x33, 0x00, 0x00, 0x00);
        write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
        write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
        udelay(250);
        write_reg(par, MIPI_DCS_SET_DISPLAY_ON);

        return 0;
}

static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
        write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
                  xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);

        write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
                  ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);

        write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
}

static int set_var(struct fbtft_par *par)
{
        switch (par->info->var.rotate) {
        case 270:
                write_reg(par, 0xB6, 0x00, 0x02, 0x3B);
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x28);
                break;
        case 180:
                write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
                break;
        case 90:
                write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x38);
                break;
        default:
                write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x08);
                break;
        }

        return 0;
}

static struct fbtft_display display = {
        .regwidth = 8,
        .width = WIDTH,
        .height = HEIGHT,
        .fbtftops = {
                .init_display = init_display,
                .set_addr_win = set_addr_win,
                .set_var = set_var,
        },
};

FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display);

MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("spi:tinylcd");

MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display");
MODULE_AUTHOR("Noralf Tronnes");
MODULE_LICENSE("GPL");