1 /* 2 * Custom FB driver for tinylcd.com display 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/delay.h> 21 #include <video/mipi_display.h> 22 23 #include "fbtft.h" 24 25 #define DRVNAME "fb_tinylcd" 26 #define WIDTH 320 27 #define HEIGHT 480 28 29 static int init_display(struct fbtft_par *par) 30 { 31 par->fbtftops.reset(par); 32 33 write_reg(par, 0xB0, 0x80); 34 write_reg(par, 0xC0, 0x0A, 0x0A); 35 write_reg(par, 0xC1, 0x45, 0x07); 36 write_reg(par, 0xC2, 0x33); 37 write_reg(par, 0xC5, 0x00, 0x42, 0x80); 38 write_reg(par, 0xB1, 0xD0, 0x11); 39 write_reg(par, 0xB4, 0x02); 40 write_reg(par, 0xB6, 0x00, 0x22, 0x3B); 41 write_reg(par, 0xB7, 0x07); 42 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58); 43 write_reg(par, 0xF0, 0x36, 0xA5, 0xD3); 44 write_reg(par, 0xE5, 0x80); 45 write_reg(par, 0xE5, 0x01); 46 write_reg(par, 0xB3, 0x00); 47 write_reg(par, 0xE5, 0x00); 48 write_reg(par, 0xF0, 0x36, 0xA5, 0x53); 49 write_reg(par, 0xE0, 0x00, 0x35, 0x33, 0x00, 0x00, 0x00, 50 0x00, 0x35, 0x33, 0x00, 0x00, 0x00); 51 write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 52 write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE); 53 udelay(250); 54 write_reg(par, MIPI_DCS_SET_DISPLAY_ON); 55 56 return 0; 57 } 58 59 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 60 { 61 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 62 xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); 63 64 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 65 ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); 66 67 write_reg(par, MIPI_DCS_WRITE_MEMORY_START); 68 } 69 70 static int set_var(struct fbtft_par *par) 71 { 72 switch (par->info->var.rotate) { 73 case 270: 74 write_reg(par, 0xB6, 0x00, 0x02, 0x3B); 75 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x28); 76 break; 77 case 180: 78 write_reg(par, 0xB6, 0x00, 0x22, 0x3B); 79 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58); 80 break; 81 case 90: 82 write_reg(par, 0xB6, 0x00, 0x22, 0x3B); 83 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x38); 84 break; 85 default: 86 write_reg(par, 0xB6, 0x00, 0x22, 0x3B); 87 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x08); 88 break; 89 } 90 91 return 0; 92 } 93 94 static struct fbtft_display display = { 95 .regwidth = 8, 96 .width = WIDTH, 97 .height = HEIGHT, 98 .fbtftops = { 99 .init_display = init_display, 100 .set_addr_win = set_addr_win, 101 .set_var = set_var, 102 }, 103 }; 104 105 FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display); 106 107 MODULE_ALIAS("spi:" DRVNAME); 108 MODULE_ALIAS("spi:tinylcd"); 109 110 MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display"); 111 MODULE_AUTHOR("Noralf Tronnes"); 112 MODULE_LICENSE("GPL"); 113