// SPDX-License-Identifier: GPL-2.0+
/*
 * FB driver for the S6D02A1 LCD Controller
 *
 * Based on fb_st7735r.c by Noralf Tronnes
 * Init code from UTFT library by Henning Karlsen
 */

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

#include "fbtft.h"

#define DRVNAME "fb_s6d02a1"

static const s16 default_init_sequence[] = {
        -1, 0xf0, 0x5a, 0x5a,

        -1, 0xfc, 0x5a, 0x5a,

        -1, 0xfa, 0x02, 0x1f, 0x00, 0x10, 0x22, 0x30, 0x38,
        0x3A, 0x3A, 0x3A, 0x3A, 0x3A, 0x3d, 0x02, 0x01,

        -1, 0xfb, 0x21, 0x00, 0x02, 0x04, 0x07, 0x0a, 0x0b,
        0x0c, 0x0c, 0x16, 0x1e, 0x30, 0x3f, 0x01, 0x02,

        /* power setting sequence */
        -1, 0xfd, 0x00, 0x00, 0x00, 0x17, 0x10, 0x00, 0x01,
        0x01, 0x00, 0x1f, 0x1f,

        -1, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x3f,
        0x07, 0x00, 0x3C, 0x36, 0x00, 0x3C, 0x36, 0x00,

        -1, 0xf5, 0x00, 0x70, 0x66, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x6d, 0x66, 0x06,

        -1, 0xf6, 0x02, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x02,
        0x00, 0x06, 0x01, 0x00,

        -1, 0xf2, 0x00, 0x01, 0x03, 0x08, 0x08, 0x04, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x04, 0x08, 0x08,

        -1, 0xf8, 0x11,

        -1, 0xf7, 0xc8, 0x20, 0x00, 0x00,

        -1, 0xf3, 0x00, 0x00,

        -1, MIPI_DCS_EXIT_SLEEP_MODE,
        -2, 50,

        -1, 0xf3, 0x00, 0x01,
        -2, 50,
        -1, 0xf3, 0x00, 0x03,
        -2, 50,
        -1, 0xf3, 0x00, 0x07,
        -2, 50,
        -1, 0xf3, 0x00, 0x0f,
        -2, 50,

        -1, 0xf4, 0x00, 0x04, 0x00, 0x00, 0x00, 0x3f, 0x3f,
        0x07, 0x00, 0x3C, 0x36, 0x00, 0x3C, 0x36, 0x00,
        -2, 50,

        -1, 0xf3, 0x00, 0x1f,
        -2, 50,
        -1, 0xf3, 0x00, 0x7f,
        -2, 50,

        -1, 0xf3, 0x00, 0xff,
        -2, 50,

        -1, 0xfd, 0x00, 0x00, 0x00, 0x17, 0x10, 0x00, 0x00,
        0x01, 0x00, 0x16, 0x16,

        -1, 0xf4, 0x00, 0x09, 0x00, 0x00, 0x00, 0x3f, 0x3f,
        0x07, 0x00, 0x3C, 0x36, 0x00, 0x3C, 0x36, 0x00,

        /* initializing sequence */

        -1, MIPI_DCS_SET_ADDRESS_MODE, 0x08,

        -1, MIPI_DCS_SET_TEAR_ON, 0x00,

        -1, MIPI_DCS_SET_PIXEL_FORMAT, 0x05,

        /* gamma setting - possible values 0x01, 0x02, 0x04, 0x08 */
        -1, MIPI_DCS_SET_GAMMA_CURVE, 0x01,

        -2, 150,
        -1, MIPI_DCS_SET_DISPLAY_ON,
        -1, MIPI_DCS_WRITE_MEMORY_START,
        /* 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);
}

#define MY BIT(7)
#define MX BIT(6)
#define MV BIT(5)
static int set_var(struct fbtft_par *par)
{
        /*
         * Memory data access control (0x36h)
         * RGB/BGR:
         *      1. Mode selection pin SRGB
         *              RGB H/W pin for color filter setting: 0=RGB, 1=BGR
         *      2. MADCTL RGB bit
         *              RGB-BGR ORDER color filter panel: 0=RGB, 1=BGR
         */
        switch (par->info->var.rotate) {
        case 0:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          MX | MY | (par->bgr << 3));
                break;
        case 270:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          MY | MV | (par->bgr << 3));
                break;
        case 180:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          par->bgr << 3);
                break;
        case 90:
                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
                          MX | MV | (par->bgr << 3));
                break;
        }

        return 0;
}

static struct fbtft_display display = {
        .regwidth = 8,
        .width = 128,
        .height = 160,
        .init_sequence = default_init_sequence,
        .fbtftops = {
                .set_addr_win = set_addr_win,
                .set_var = set_var,
        },
};

FBTFT_REGISTER_DRIVER(DRVNAME, "samsung,s6d02a1", &display);

MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:s6d02a1");
MODULE_ALIAS("platform:s6d02a1");

MODULE_DESCRIPTION("FB driver for the S6D02A1 LCD Controller");
MODULE_AUTHOR("WOLFGANG BUENING");
MODULE_LICENSE("GPL");