1 /* 2 * FB driver for the ILI9340 LCD Controller 3 * 4 * Copyright (C) 2013 Noralf Tronnes 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/kernel.h> 19 #include <linux/init.h> 20 #include <linux/gpio.h> 21 #include <linux/delay.h> 22 #include <video/mipi_display.h> 23 24 #include "fbtft.h" 25 26 #define DRVNAME "fb_ili9340" 27 #define WIDTH 240 28 #define HEIGHT 320 29 30 /* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */ 31 static int init_display(struct fbtft_par *par) 32 { 33 par->fbtftops.reset(par); 34 35 write_reg(par, 0xEF, 0x03, 0x80, 0x02); 36 write_reg(par, 0xCF, 0x00, 0XC1, 0X30); 37 write_reg(par, 0xED, 0x64, 0x03, 0X12, 0X81); 38 write_reg(par, 0xE8, 0x85, 0x00, 0x78); 39 write_reg(par, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02); 40 write_reg(par, 0xF7, 0x20); 41 write_reg(par, 0xEA, 0x00, 0x00); 42 43 /* Power Control 1 */ 44 write_reg(par, 0xC0, 0x23); 45 46 /* Power Control 2 */ 47 write_reg(par, 0xC1, 0x10); 48 49 /* VCOM Control 1 */ 50 write_reg(par, 0xC5, 0x3e, 0x28); 51 52 /* VCOM Control 2 */ 53 write_reg(par, 0xC7, 0x86); 54 55 /* COLMOD: Pixel Format Set */ 56 /* 16 bits/pixel */ 57 write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 58 59 /* Frame Rate Control */ 60 /* Division ratio = fosc, Frame Rate = 79Hz */ 61 write_reg(par, 0xB1, 0x00, 0x18); 62 63 /* Display Function Control */ 64 write_reg(par, 0xB6, 0x08, 0x82, 0x27); 65 66 /* Gamma Function Disable */ 67 write_reg(par, 0xF2, 0x00); 68 69 /* Gamma curve selection */ 70 write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01); 71 72 /* Positive Gamma Correction */ 73 write_reg(par, 0xE0, 74 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, 75 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00); 76 77 /* Negative Gamma Correction */ 78 write_reg(par, 0xE1, 79 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, 80 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F); 81 82 write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE); 83 84 mdelay(120); 85 86 write_reg(par, MIPI_DCS_SET_DISPLAY_ON); 87 88 return 0; 89 } 90 91 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 92 { 93 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 94 xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); 95 96 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 97 ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); 98 99 write_reg(par, MIPI_DCS_WRITE_MEMORY_START); 100 } 101 102 #define ILI9340_MADCTL_MV 0x20 103 #define ILI9340_MADCTL_MX 0x40 104 #define ILI9340_MADCTL_MY 0x80 105 static int set_var(struct fbtft_par *par) 106 { 107 u8 val; 108 109 switch (par->info->var.rotate) { 110 case 270: 111 val = ILI9340_MADCTL_MV; 112 break; 113 case 180: 114 val = ILI9340_MADCTL_MY; 115 break; 116 case 90: 117 val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX; 118 break; 119 default: 120 val = ILI9340_MADCTL_MX; 121 break; 122 } 123 /* Memory Access Control */ 124 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val | (par->bgr << 3)); 125 126 return 0; 127 } 128 129 static struct fbtft_display display = { 130 .regwidth = 8, 131 .width = WIDTH, 132 .height = HEIGHT, 133 .fbtftops = { 134 .init_display = init_display, 135 .set_addr_win = set_addr_win, 136 .set_var = set_var, 137 }, 138 }; 139 140 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display); 141 142 MODULE_ALIAS("spi:" DRVNAME); 143 MODULE_ALIAS("platform:" DRVNAME); 144 MODULE_ALIAS("spi:ili9340"); 145 MODULE_ALIAS("platform:ili9340"); 146 147 MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller"); 148 MODULE_AUTHOR("Noralf Tronnes"); 149 MODULE_LICENSE("GPL"); 150