fb_ili9486.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * FB driver for the ILI9486 LCD Controller
  4 *
  5 * Copyright (C) 2014 Noralf Tronnes
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/kernel.h>
 10#include <linux/init.h>
 11#include <video/mipi_display.h>
 12
 13#include "fbtft.h"
 14
 15#define DRVNAME		"fb_ili9486"
 16#define WIDTH		320
 17#define HEIGHT		480
 18
 19/* this init sequence matches PiScreen */
 20static const s16 default_init_sequence[] = {
 21	/* Interface Mode Control */
 22	-1, 0xb0, 0x0,
 23	-1, MIPI_DCS_EXIT_SLEEP_MODE,
 24	-2, 250,
 25	/* Interface Pixel Format */
 26	-1, MIPI_DCS_SET_PIXEL_FORMAT, 0x55,
 27	/* Power Control 3 */
 28	-1, 0xC2, 0x44,
 29	/* VCOM Control 1 */
 30	-1, 0xC5, 0x00, 0x00, 0x00, 0x00,
 31	/* PGAMCTRL(Positive Gamma Control) */
 32	-1, 0xE0, 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
 33		  0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x00,
 34	/* NGAMCTRL(Negative Gamma Control) */
 35	-1, 0xE1, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
 36		  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
 37	/* Digital Gamma Control 1 */
 38	-1, 0xE2, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
 39		  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
 40	-1, MIPI_DCS_EXIT_SLEEP_MODE,
 41	-1, MIPI_DCS_SET_DISPLAY_ON,
 42	/* end marker */
 43	-3
 44};
 45
 46static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 47{
 48	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
 49		  xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
 50
 51	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
 52		  ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
 53
 54	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
 55}
 56
 57static int set_var(struct fbtft_par *par)
 58{
 59	switch (par->info->var.rotate) {
 60	case 0:
 61		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 62			  0x80 | (par->bgr << 3));
 63		break;
 64	case 90:
 65		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 66			  0x20 | (par->bgr << 3));
 67		break;
 68	case 180:
 69		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 70			  0x40 | (par->bgr << 3));
 71		break;
 72	case 270:
 73		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 74			  0xE0 | (par->bgr << 3));
 75		break;
 76	default:
 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,ili9486", &display);
 95
 96MODULE_ALIAS("spi:" DRVNAME);
 97MODULE_ALIAS("platform:" DRVNAME);
 98MODULE_ALIAS("spi:ili9486");
 99MODULE_ALIAS("platform:ili9486");
100
101MODULE_DESCRIPTION("FB driver for the ILI9486 LCD Controller");
102MODULE_AUTHOR("Noralf Tronnes");
103MODULE_LICENSE("GPL");