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 */ 21 static 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 81 static 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 95 static 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 } 118 119 static 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 }; 129 130 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display); 131 132 MODULE_ALIAS("spi:" DRVNAME); 133 MODULE_ALIAS("platform:" DRVNAME); 134 MODULE_ALIAS("spi:ili9340"); 135 MODULE_ALIAS("platform:ili9340"); 136 137 MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller"); 138 MODULE_AUTHOR("Noralf Tronnes"); 139 MODULE_LICENSE("GPL"); 140