fb_ili9481.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * FB driver for the ILI9481 LCD Controller
  4 *
  5 * Copyright (c) 2014 Petr Olivka
  6 * Copyright (c) 2013 Noralf Tronnes
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/kernel.h>
 11#include <linux/init.h>
 12#include <linux/delay.h>
 13#include <video/mipi_display.h>
 14
 15#include "fbtft.h"
 16
 17#define DRVNAME	"fb_ili9481"
 18#define WIDTH		320
 19#define HEIGHT		480
 20
 21static const s16 default_init_sequence[] = {
 22	/* SLP_OUT - Sleep out */
 23	-1, MIPI_DCS_EXIT_SLEEP_MODE,
 24	-2, 50,
 25	/* Power setting */
 26	-1, 0xD0, 0x07, 0x42, 0x18,
 27	/* VCOM */
 28	-1, 0xD1, 0x00, 0x07, 0x10,
 29	/* Power setting for norm. mode */
 30	-1, 0xD2, 0x01, 0x02,
 31	/* Panel driving setting */
 32	-1, 0xC0, 0x10, 0x3B, 0x00, 0x02, 0x11,
 33	/* Frame rate & inv. */
 34	-1, 0xC5, 0x03,
 35	/* Pixel format */
 36	-1, MIPI_DCS_SET_PIXEL_FORMAT, 0x55,
 37	/* Gamma */
 38	-1, 0xC8, 0x00, 0x32, 0x36, 0x45, 0x06, 0x16,
 39		  0x37, 0x75, 0x77, 0x54, 0x0C, 0x00,
 40	/* DISP_ON */
 41	-1, MIPI_DCS_SET_DISPLAY_ON,
 42	-3
 43};
 44
 45static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 46{
 47	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
 48		  xs >> 8, xs & 0xff, xe >> 8, xe & 0xff);
 49
 50	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
 51		  ys >> 8, ys & 0xff, ye >> 8, ye & 0xff);
 52
 53	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
 54}
 55
 56#define HFLIP 0x01
 57#define VFLIP 0x02
 58#define ROW_X_COL 0x20
 59static int set_var(struct fbtft_par *par)
 60{
 61	switch (par->info->var.rotate) {
 62	case 270:
 63		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 64			  ROW_X_COL | HFLIP | VFLIP | (par->bgr << 3));
 65		break;
 66	case 180:
 67		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 68			  VFLIP | (par->bgr << 3));
 69		break;
 70	case 90:
 71		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 72			  ROW_X_COL | (par->bgr << 3));
 73		break;
 74	default:
 75		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 76			  HFLIP | (par->bgr << 3));
 77		break;
 78	}
 79
 80	return 0;
 81}
 82
 83static struct fbtft_display display = {
 84	.regwidth = 8,
 85	.width = WIDTH,
 86	.height = HEIGHT,
 87	.init_sequence = default_init_sequence,
 88	.fbtftops = {
 89		.set_addr_win = set_addr_win,
 90		.set_var = set_var,
 91	},
 92};
 93
 94FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9481", &display);
 95
 96MODULE_ALIAS("spi:" DRVNAME);
 97MODULE_ALIAS("platform:" DRVNAME);
 98MODULE_ALIAS("spi:ili9481");
 99MODULE_ALIAS("platform:ili9481");
100
101MODULE_DESCRIPTION("FB driver for the ILI9481 LCD Controller");
102MODULE_AUTHOR("Petr Olivka");
103MODULE_LICENSE("GPL");