// SPDX-License-Identifier: GPL-2.0+
/*
 * FB driver for the ILI9486 LCD Controller
 *
 * Copyright (C) 2014 Noralf Tronnes
 */

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

#include "fbtft.h"

#define DRVNAME         "fb_ili9486"
#define WIDTH           320
#define HEIGHT          480

/* this init sequence matches PiScreen */
static const s16 default_init_sequence[] = {
        /* Interface Mode Control */
        -1, 0xb0, 0x0,
        -1, MIPI_DCS_EXIT_SLEEP_MODE,
        -2, 250,
        /* Interface Pixel Format */
        -1, MIPI_DCS_SET_PIXEL_FORMAT, 0x55,
        /* Power Control 3 */
        -1, 0xC2, 0x44,
        /* VCOM Control 1 */
        -1, 0xC5, 0x00, 0x00, 0x00, 0x00,
        /* PGAMCTRL(Positive Gamma Control) */
        -1, 0xE0, 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
                  0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x00,
        /* NGAMCTRL(Negative Gamma Control) */
        -1, 0xE1, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
                  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
        /* Digital Gamma Control 1 */
        -1, 0xE2, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
                  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
        -1, MIPI_DCS_EXIT_SLEEP_MODE,
        -1, MIPI_DCS_SET_DISPLAY_ON,
        /* end marker */
        -3
};

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 0:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          0x80 | (par->bgr << 3));
                break;
        case 90:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          0x20 | (par->bgr << 3));
                break;
        case 180:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          0x40 | (par->bgr << 3));
                break;
        case 270:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          0xE0 | (par->bgr << 3));
                break;
        default:
                break;
        }

        return 0;
}

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

FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9486", &display);

MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:ili9486");
MODULE_ALIAS("platform:ili9486");

MODULE_DESCRIPTION("FB driver for the ILI9486 LCD Controller");
MODULE_AUTHOR("Noralf Tronnes");
MODULE_LICENSE("GPL");