1 /* 2 * FB driver for the ILI9481 LCD Controller 3 * 4 * Copyright (c) 2014 Petr Olivka 5 * Copyright (c) 2013 Noralf Tronnes 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/init.h> 21 #include <linux/delay.h> 22 23 #include "fbtft.h" 24 25 #define DRVNAME "fb_ili9481" 26 #define WIDTH 320 27 #define HEIGHT 480 28 29 static int default_init_sequence[] = { 30 31 /* SLP_OUT - Sleep out */ 32 -1, 0x11, 33 -2, 50, 34 /* Power setting */ 35 -1, 0xD0, 0x07, 0x42, 0x18, 36 /* VCOM */ 37 -1, 0xD1, 0x00, 0x07, 0x10, 38 /* Power setting for norm. mode */ 39 -1, 0xD2, 0x01, 0x02, 40 /* Panel driving setting */ 41 -1, 0xC0, 0x10, 0x3B, 0x00, 0x02, 0x11, 42 /* Frame rate & inv. */ 43 -1, 0xC5, 0x03, 44 /* Pixel format */ 45 -1, 0x3A, 0x55, 46 /* Gamma */ 47 -1, 0xC8, 0x00, 0x32, 0x36, 0x45, 0x06, 0x16, 48 0x37, 0x75, 0x77, 0x54, 0x0C, 0x00, 49 /* DISP_ON */ 50 -1, 0x29, 51 -3 52 }; 53 54 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 55 { 56 /* column address */ 57 write_reg(par, 0x2a, xs >> 8, xs & 0xff, xe >> 8, xe & 0xff); 58 59 /* Row address */ 60 write_reg(par, 0x2b, ys >> 8, ys & 0xff, ye >> 8, ye & 0xff); 61 62 /* memory write */ 63 write_reg(par, 0x2c); 64 } 65 66 #define HFLIP 0x01 67 #define VFLIP 0x02 68 #define ROWxCOL 0x20 69 static int set_var(struct fbtft_par *par) 70 { 71 switch (par->info->var.rotate) { 72 case 270: 73 write_reg(par, 0x36, ROWxCOL | HFLIP | VFLIP | (par->bgr << 3)); 74 break; 75 case 180: 76 write_reg(par, 0x36, VFLIP | (par->bgr << 3)); 77 break; 78 case 90: 79 write_reg(par, 0x36, ROWxCOL | (par->bgr << 3)); 80 break; 81 default: 82 write_reg(par, 0x36, HFLIP | (par->bgr << 3)); 83 break; 84 } 85 86 return 0; 87 } 88 89 static struct fbtft_display display = { 90 .regwidth = 8, 91 .width = WIDTH, 92 .height = HEIGHT, 93 .init_sequence = default_init_sequence, 94 .fbtftops = { 95 .set_addr_win = set_addr_win, 96 .set_var = set_var, 97 }, 98 }; 99 100 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9481", &display); 101 102 MODULE_ALIAS("spi:" DRVNAME); 103 MODULE_ALIAS("platform:" DRVNAME); 104 MODULE_ALIAS("spi:ili9481"); 105 MODULE_ALIAS("platform:ili9481"); 106 107 MODULE_DESCRIPTION("FB driver for the ILI9481 LCD Controller"); 108 MODULE_AUTHOR("Petr Olivka"); 109 MODULE_LICENSE("GPL"); 110