1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * FB driver for the ILI9341 LCD display controller 4 * 5 * This display uses 9-bit SPI: Data/Command bit + 8 data bits 6 * For platforms that doesn't support 9-bit, the driver is capable 7 * of emulating this using 8-bit transfer. 8 * This is done by transferring eight 9-bit words in 9 bytes. 9 * 10 * Copyright (C) 2013 Christian Vogelgsang 11 * Based on adafruit22fb.c by Noralf Tronnes 12 */ 13 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/delay.h> 18 #include <video/mipi_display.h> 19 20 #include "fbtft.h" 21 22 #define DRVNAME "fb_ili9341" 23 #define WIDTH 240 24 #define HEIGHT 320 25 #define TXBUFLEN (4 * PAGE_SIZE) 26 #define DEFAULT_GAMMA "1F 1A 18 0A 0F 06 45 87 32 0A 07 02 07 05 00\n" \ 27 "00 25 27 05 10 09 3A 78 4D 05 18 0D 38 3A 1F" 28 29 static int init_display(struct fbtft_par *par) 30 { 31 par->fbtftops.reset(par); 32 33 /* startup sequence for MI0283QT-9A */ 34 write_reg(par, MIPI_DCS_SOFT_RESET); 35 mdelay(5); 36 write_reg(par, MIPI_DCS_SET_DISPLAY_OFF); 37 /* --------------------------------------------------------- */ 38 write_reg(par, 0xCF, 0x00, 0x83, 0x30); 39 write_reg(par, 0xED, 0x64, 0x03, 0x12, 0x81); 40 write_reg(par, 0xE8, 0x85, 0x01, 0x79); 41 write_reg(par, 0xCB, 0x39, 0X2C, 0x00, 0x34, 0x02); 42 write_reg(par, 0xF7, 0x20); 43 write_reg(par, 0xEA, 0x00, 0x00); 44 /* ------------power control-------------------------------- */ 45 write_reg(par, 0xC0, 0x26); 46 write_reg(par, 0xC1, 0x11); 47 /* ------------VCOM --------- */ 48 write_reg(par, 0xC5, 0x35, 0x3E); 49 write_reg(par, 0xC7, 0xBE); 50 /* ------------memory access control------------------------ */ 51 write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); /* 16bit pixel */ 52 /* ------------frame rate----------------------------------- */ 53 write_reg(par, 0xB1, 0x00, 0x1B); 54 /* ------------Gamma---------------------------------------- */ 55 /* write_reg(par, 0xF2, 0x08); */ /* Gamma Function Disable */ 56 write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01); 57 /* ------------display-------------------------------------- */ 58 write_reg(par, 0xB7, 0x07); /* entry mode set */ 59 write_reg(par, 0xB6, 0x0A, 0x82, 0x27, 0x00); 60 write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE); 61 mdelay(100); 62 write_reg(par, MIPI_DCS_SET_DISPLAY_ON); 63 mdelay(20); 64 65 return 0; 66 } 67 68 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 69 { 70 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 71 (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF); 72 73 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 74 (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF); 75 76 write_reg(par, MIPI_DCS_WRITE_MEMORY_START); 77 } 78 79 #define MEM_Y BIT(7) /* MY row address order */ 80 #define MEM_X BIT(6) /* MX column address order */ 81 #define MEM_V BIT(5) /* MV row / column exchange */ 82 #define MEM_L BIT(4) /* ML vertical refresh order */ 83 #define MEM_H BIT(2) /* MH horizontal refresh order */ 84 #define MEM_BGR (3) /* RGB-BGR Order */ 85 static int set_var(struct fbtft_par *par) 86 { 87 switch (par->info->var.rotate) { 88 case 0: 89 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 90 MEM_X | (par->bgr << MEM_BGR)); 91 break; 92 case 270: 93 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 94 MEM_V | MEM_L | (par->bgr << MEM_BGR)); 95 break; 96 case 180: 97 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 98 MEM_Y | (par->bgr << MEM_BGR)); 99 break; 100 case 90: 101 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 102 MEM_Y | MEM_X | MEM_V | (par->bgr << MEM_BGR)); 103 break; 104 } 105 106 return 0; 107 } 108 109 /* 110 * Gamma string format: 111 * Positive: Par1 Par2 [...] Par15 112 * Negative: Par1 Par2 [...] Par15 113 */ 114 #define CURVE(num, idx) curves[(num) * par->gamma.num_values + (idx)] 115 static int set_gamma(struct fbtft_par *par, u32 *curves) 116 { 117 int i; 118 119 for (i = 0; i < par->gamma.num_curves; i++) 120 write_reg(par, 0xE0 + i, 121 CURVE(i, 0), CURVE(i, 1), CURVE(i, 2), 122 CURVE(i, 3), CURVE(i, 4), CURVE(i, 5), 123 CURVE(i, 6), CURVE(i, 7), CURVE(i, 8), 124 CURVE(i, 9), CURVE(i, 10), CURVE(i, 11), 125 CURVE(i, 12), CURVE(i, 13), CURVE(i, 14)); 126 127 return 0; 128 } 129 130 #undef CURVE 131 132 static struct fbtft_display display = { 133 .regwidth = 8, 134 .width = WIDTH, 135 .height = HEIGHT, 136 .txbuflen = TXBUFLEN, 137 .gamma_num = 2, 138 .gamma_len = 15, 139 .gamma = DEFAULT_GAMMA, 140 .fbtftops = { 141 .init_display = init_display, 142 .set_addr_win = set_addr_win, 143 .set_var = set_var, 144 .set_gamma = set_gamma, 145 }, 146 }; 147 148 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9341", &display); 149 150 MODULE_ALIAS("spi:" DRVNAME); 151 MODULE_ALIAS("platform:" DRVNAME); 152 MODULE_ALIAS("spi:ili9341"); 153 MODULE_ALIAS("platform:ili9341"); 154 155 MODULE_DESCRIPTION("FB driver for the ILI9341 LCD display controller"); 156 MODULE_AUTHOR("Christian Vogelgsang"); 157 MODULE_LICENSE("GPL"); 158