fb_ili9340.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * FB driver for the ILI9340 LCD Controller
  4 *
  5 * Copyright (C) 2013 Noralf Tronnes
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/kernel.h>
 10#include <linux/init.h>
 11#include <linux/delay.h>
 12#include <video/mipi_display.h>
 13
 14#include "fbtft.h"
 15
 16#define DRVNAME		"fb_ili9340"
 17#define WIDTH		240
 18#define HEIGHT		320
 19
 20/* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */
 21static int init_display(struct fbtft_par *par)
 22{
 23	par->fbtftops.reset(par);
 24
 25	write_reg(par, 0xEF, 0x03, 0x80, 0x02);
 26	write_reg(par, 0xCF, 0x00, 0XC1, 0X30);
 27	write_reg(par, 0xED, 0x64, 0x03, 0X12, 0X81);
 28	write_reg(par, 0xE8, 0x85, 0x00, 0x78);
 29	write_reg(par, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02);
 30	write_reg(par, 0xF7, 0x20);
 31	write_reg(par, 0xEA, 0x00, 0x00);
 32
 33	/* Power Control 1 */
 34	write_reg(par, 0xC0, 0x23);
 35
 36	/* Power Control 2 */
 37	write_reg(par, 0xC1, 0x10);
 38
 39	/* VCOM Control 1 */
 40	write_reg(par, 0xC5, 0x3e, 0x28);
 41
 42	/* VCOM Control 2 */
 43	write_reg(par, 0xC7, 0x86);
 44
 45	/* COLMOD: Pixel Format Set */
 46	/* 16 bits/pixel */
 47	write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
 48
 49	/* Frame Rate Control */
 50	/* Division ratio = fosc, Frame Rate = 79Hz */
 51	write_reg(par, 0xB1, 0x00, 0x18);
 52
 53	/* Display Function Control */
 54	write_reg(par, 0xB6, 0x08, 0x82, 0x27);
 55
 56	/* Gamma Function Disable */
 57	write_reg(par, 0xF2, 0x00);
 58
 59	/* Gamma curve selection */
 60	write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
 61
 62	/* Positive Gamma Correction */
 63	write_reg(par, 0xE0,
 64		  0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1,
 65		  0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00);
 66
 67	/* Negative Gamma Correction */
 68	write_reg(par, 0xE1,
 69		  0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1,
 70		  0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F);
 71
 72	write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
 73
 74	mdelay(120);
 75
 76	write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
 77
 78	return 0;
 79}
 80
 81static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 82{
 83	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
 84		  xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
 85
 86	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
 87		  ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
 88
 89	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
 90}
 91
 92#define ILI9340_MADCTL_MV  0x20
 93#define ILI9340_MADCTL_MX  0x40
 94#define ILI9340_MADCTL_MY  0x80
 95static int set_var(struct fbtft_par *par)
 96{
 97	u8 val;
 98
 99	switch (par->info->var.rotate) {
100	case 270:
101		val = ILI9340_MADCTL_MV;
102		break;
103	case 180:
104		val = ILI9340_MADCTL_MY;
105		break;
106	case 90:
107		val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX;
108		break;
109	default:
110		val = ILI9340_MADCTL_MX;
111		break;
112	}
113	/* Memory Access Control  */
114	write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val | (par->bgr << 3));
115
116	return 0;
117}
118
119static struct fbtft_display display = {
120	.regwidth = 8,
121	.width = WIDTH,
122	.height = HEIGHT,
123	.fbtftops = {
124		.init_display = init_display,
125		.set_addr_win = set_addr_win,
126		.set_var = set_var,
127	},
128};
129
130FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display);
131
132MODULE_ALIAS("spi:" DRVNAME);
133MODULE_ALIAS("platform:" DRVNAME);
134MODULE_ALIAS("spi:ili9340");
135MODULE_ALIAS("platform:ili9340");
136
137MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller");
138MODULE_AUTHOR("Noralf Tronnes");
139MODULE_LICENSE("GPL");