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/gpio/consumer.h> 12 #include <linux/delay.h> 13 #include <video/mipi_display.h> 14 15 #include "fbtft.h" 16 17 #define DRVNAME "fb_ili9340" 18 #define WIDTH 240 19 #define HEIGHT 320 20 21 /* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */ 22 static int init_display(struct fbtft_par *par) 23 { 24 par->fbtftops.reset(par); 25 26 write_reg(par, 0xEF, 0x03, 0x80, 0x02); 27 write_reg(par, 0xCF, 0x00, 0XC1, 0X30); 28 write_reg(par, 0xED, 0x64, 0x03, 0X12, 0X81); 29 write_reg(par, 0xE8, 0x85, 0x00, 0x78); 30 write_reg(par, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02); 31 write_reg(par, 0xF7, 0x20); 32 write_reg(par, 0xEA, 0x00, 0x00); 33 34 /* Power Control 1 */ 35 write_reg(par, 0xC0, 0x23); 36 37 /* Power Control 2 */ 38 write_reg(par, 0xC1, 0x10); 39 40 /* VCOM Control 1 */ 41 write_reg(par, 0xC5, 0x3e, 0x28); 42 43 /* VCOM Control 2 */ 44 write_reg(par, 0xC7, 0x86); 45 46 /* COLMOD: Pixel Format Set */ 47 /* 16 bits/pixel */ 48 write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 49 50 /* Frame Rate Control */ 51 /* Division ratio = fosc, Frame Rate = 79Hz */ 52 write_reg(par, 0xB1, 0x00, 0x18); 53 54 /* Display Function Control */ 55 write_reg(par, 0xB6, 0x08, 0x82, 0x27); 56 57 /* Gamma Function Disable */ 58 write_reg(par, 0xF2, 0x00); 59 60 /* Gamma curve selection */ 61 write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01); 62 63 /* Positive Gamma Correction */ 64 write_reg(par, 0xE0, 65 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, 66 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00); 67 68 /* Negative Gamma Correction */ 69 write_reg(par, 0xE1, 70 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, 71 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F); 72 73 write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE); 74 75 mdelay(120); 76 77 write_reg(par, MIPI_DCS_SET_DISPLAY_ON); 78 79 return 0; 80 } 81 82 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 83 { 84 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 85 xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); 86 87 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 88 ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); 89 90 write_reg(par, MIPI_DCS_WRITE_MEMORY_START); 91 } 92 93 #define ILI9340_MADCTL_MV 0x20 94 #define ILI9340_MADCTL_MX 0x40 95 #define ILI9340_MADCTL_MY 0x80 96 static int set_var(struct fbtft_par *par) 97 { 98 u8 val; 99 100 switch (par->info->var.rotate) { 101 case 270: 102 val = ILI9340_MADCTL_MV; 103 break; 104 case 180: 105 val = ILI9340_MADCTL_MY; 106 break; 107 case 90: 108 val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX; 109 break; 110 default: 111 val = ILI9340_MADCTL_MX; 112 break; 113 } 114 /* Memory Access Control */ 115 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val | (par->bgr << 3)); 116 117 return 0; 118 } 119 120 static struct fbtft_display display = { 121 .regwidth = 8, 122 .width = WIDTH, 123 .height = HEIGHT, 124 .fbtftops = { 125 .init_display = init_display, 126 .set_addr_win = set_addr_win, 127 .set_var = set_var, 128 }, 129 }; 130 131 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display); 132 133 MODULE_ALIAS("spi:" DRVNAME); 134 MODULE_ALIAS("platform:" DRVNAME); 135 MODULE_ALIAS("spi:ili9340"); 136 MODULE_ALIAS("platform:ili9340"); 137 138 MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller"); 139 MODULE_AUTHOR("Noralf Tronnes"); 140 MODULE_LICENSE("GPL"); 141