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 #include <video/mipi_display.h> 23 24 #include "fbtft.h" 25 26 #define DRVNAME "fb_ili9481" 27 #define WIDTH 320 28 #define HEIGHT 480 29 30 static int default_init_sequence[] = { 31 /* SLP_OUT - Sleep out */ 32 -1, MIPI_DCS_EXIT_SLEEP_MODE, 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, MIPI_DCS_SET_PIXEL_FORMAT, 0x55, 46 /* Gamma */ 47 -1, 0xC8, 0x00, 0x32, 0x36, 0x45, 0x06, 0x16, 48 0x37, 0x75, 0x77, 0x54, 0x0C, 0x00, 49 /* DISP_ON */ 50 -1, MIPI_DCS_SET_DISPLAY_ON, 51 -3 52 }; 53 54 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 55 { 56 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 57 xs >> 8, xs & 0xff, xe >> 8, xe & 0xff); 58 59 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 60 ys >> 8, ys & 0xff, ye >> 8, ye & 0xff); 61 62 write_reg(par, MIPI_DCS_WRITE_MEMORY_START); 63 } 64 65 #define HFLIP 0x01 66 #define VFLIP 0x02 67 #define ROW_X_COL 0x20 68 static int set_var(struct fbtft_par *par) 69 { 70 switch (par->info->var.rotate) { 71 case 270: 72 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 73 ROW_X_COL | HFLIP | VFLIP | (par->bgr << 3)); 74 break; 75 case 180: 76 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 77 VFLIP | (par->bgr << 3)); 78 break; 79 case 90: 80 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 81 ROW_X_COL | (par->bgr << 3)); 82 break; 83 default: 84 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 85 HFLIP | (par->bgr << 3)); 86 break; 87 } 88 89 return 0; 90 } 91 92 static struct fbtft_display display = { 93 .regwidth = 8, 94 .width = WIDTH, 95 .height = HEIGHT, 96 .init_sequence = default_init_sequence, 97 .fbtftops = { 98 .set_addr_win = set_addr_win, 99 .set_var = set_var, 100 }, 101 }; 102 103 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9481", &display); 104 105 MODULE_ALIAS("spi:" DRVNAME); 106 MODULE_ALIAS("platform:" DRVNAME); 107 MODULE_ALIAS("spi:ili9481"); 108 MODULE_ALIAS("platform:ili9481"); 109 110 MODULE_DESCRIPTION("FB driver for the ILI9481 LCD Controller"); 111 MODULE_AUTHOR("Petr Olivka"); 112 MODULE_LICENSE("GPL"); 113