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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | // SPDX-License-Identifier: GPL-2.0+ /* * FB driver for the ILI9340 LCD Controller * * Copyright (C) 2013 Noralf Tronnes */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/gpio.h> #include <linux/delay.h> #include <video/mipi_display.h> #include "fbtft.h" #define DRVNAME "fb_ili9340" #define WIDTH 240 #define HEIGHT 320 /* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */ static int init_display(struct fbtft_par *par) { par->fbtftops.reset(par); write_reg(par, 0xEF, 0x03, 0x80, 0x02); write_reg(par, 0xCF, 0x00, 0XC1, 0X30); write_reg(par, 0xED, 0x64, 0x03, 0X12, 0X81); write_reg(par, 0xE8, 0x85, 0x00, 0x78); write_reg(par, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02); write_reg(par, 0xF7, 0x20); write_reg(par, 0xEA, 0x00, 0x00); /* Power Control 1 */ write_reg(par, 0xC0, 0x23); /* Power Control 2 */ write_reg(par, 0xC1, 0x10); /* VCOM Control 1 */ write_reg(par, 0xC5, 0x3e, 0x28); /* VCOM Control 2 */ write_reg(par, 0xC7, 0x86); /* COLMOD: Pixel Format Set */ /* 16 bits/pixel */ write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); /* Frame Rate Control */ /* Division ratio = fosc, Frame Rate = 79Hz */ write_reg(par, 0xB1, 0x00, 0x18); /* Display Function Control */ write_reg(par, 0xB6, 0x08, 0x82, 0x27); /* Gamma Function Disable */ write_reg(par, 0xF2, 0x00); /* Gamma curve selection */ write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01); /* Positive Gamma Correction */ write_reg(par, 0xE0, 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00); /* Negative Gamma Correction */ write_reg(par, 0xE1, 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F); write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE); mdelay(120); write_reg(par, MIPI_DCS_SET_DISPLAY_ON); return 0; } static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) { write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); write_reg(par, MIPI_DCS_WRITE_MEMORY_START); } #define ILI9340_MADCTL_MV 0x20 #define ILI9340_MADCTL_MX 0x40 #define ILI9340_MADCTL_MY 0x80 static int set_var(struct fbtft_par *par) { u8 val; switch (par->info->var.rotate) { case 270: val = ILI9340_MADCTL_MV; break; case 180: val = ILI9340_MADCTL_MY; break; case 90: val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX; break; default: val = ILI9340_MADCTL_MX; break; } /* Memory Access Control */ write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val | (par->bgr << 3)); return 0; } static struct fbtft_display display = { .regwidth = 8, .width = WIDTH, .height = HEIGHT, .fbtftops = { .init_display = init_display, .set_addr_win = set_addr_win, .set_var = set_var, }, }; FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display); MODULE_ALIAS("spi:" DRVNAME); MODULE_ALIAS("platform:" DRVNAME); MODULE_ALIAS("spi:ili9340"); MODULE_ALIAS("platform:ili9340"); MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller"); MODULE_AUTHOR("Noralf Tronnes"); MODULE_LICENSE("GPL"); |