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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | // SPDX-License-Identifier: GPL-2.0+ /* * FB driver for the HX8347D LCD Controller * * Copyright (C) 2013 Christian Vogelgsang * * Based on driver code found here: https://github.com/watterott/r61505u-Adapter */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> #include "fbtft.h" #define DRVNAME "fb_hx8347d" #define WIDTH 320 #define HEIGHT 240 #define DEFAULT_GAMMA "0 0 0 0 0 0 0 0 0 0 0 0 0 0\n" \ "0 0 0 0 0 0 0 0 0 0 0 0 0 0" static int init_display(struct fbtft_par *par) { par->fbtftops.reset(par); /* driving ability */ write_reg(par, 0xEA, 0x00); write_reg(par, 0xEB, 0x20); write_reg(par, 0xEC, 0x0C); write_reg(par, 0xED, 0xC4); write_reg(par, 0xE8, 0x40); write_reg(par, 0xE9, 0x38); write_reg(par, 0xF1, 0x01); write_reg(par, 0xF2, 0x10); write_reg(par, 0x27, 0xA3); /* power voltage */ write_reg(par, 0x1B, 0x1B); write_reg(par, 0x1A, 0x01); write_reg(par, 0x24, 0x2F); write_reg(par, 0x25, 0x57); /* VCOM offset */ write_reg(par, 0x23, 0x8D); /* for flicker adjust */ /* power on */ write_reg(par, 0x18, 0x36); write_reg(par, 0x19, 0x01); /* start osc */ write_reg(par, 0x01, 0x00); /* wakeup */ write_reg(par, 0x1F, 0x88); mdelay(5); write_reg(par, 0x1F, 0x80); mdelay(5); write_reg(par, 0x1F, 0x90); mdelay(5); write_reg(par, 0x1F, 0xD0); mdelay(5); /* color selection */ write_reg(par, 0x17, 0x05); /* 65k */ /*panel characteristic */ write_reg(par, 0x36, 0x00); /*display on */ write_reg(par, 0x28, 0x38); mdelay(40); write_reg(par, 0x28, 0x3C); /* orientation */ write_reg(par, 0x16, 0x60 | (par->bgr << 3)); return 0; } static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) { write_reg(par, 0x02, (xs >> 8) & 0xFF); write_reg(par, 0x03, xs & 0xFF); write_reg(par, 0x04, (xe >> 8) & 0xFF); write_reg(par, 0x05, xe & 0xFF); write_reg(par, 0x06, (ys >> 8) & 0xFF); write_reg(par, 0x07, ys & 0xFF); write_reg(par, 0x08, (ye >> 8) & 0xFF); write_reg(par, 0x09, ye & 0xFF); write_reg(par, 0x22); } /* * Gamma string format: * VRP0 VRP1 VRP2 VRP3 VRP4 VRP5 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 CGM * VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM */ #define CURVE(num, idx) curves[(num) * par->gamma.num_values + (idx)] static int set_gamma(struct fbtft_par *par, u32 *curves) { unsigned long mask[] = { 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x0f, }; int i, j; int acc = 0; /* apply mask */ for (i = 0; i < par->gamma.num_curves; i++) for (j = 0; j < par->gamma.num_values; j++) { acc += CURVE(i, j); CURVE(i, j) &= mask[j]; } if (acc == 0) /* skip if all values are zero */ return 0; for (i = 0; i < par->gamma.num_curves; i++) { write_reg(par, 0x40 + (i * 0x10), CURVE(i, 0)); write_reg(par, 0x41 + (i * 0x10), CURVE(i, 1)); write_reg(par, 0x42 + (i * 0x10), CURVE(i, 2)); write_reg(par, 0x43 + (i * 0x10), CURVE(i, 3)); write_reg(par, 0x44 + (i * 0x10), CURVE(i, 4)); write_reg(par, 0x45 + (i * 0x10), CURVE(i, 5)); write_reg(par, 0x46 + (i * 0x10), CURVE(i, 6)); write_reg(par, 0x47 + (i * 0x10), CURVE(i, 7)); write_reg(par, 0x48 + (i * 0x10), CURVE(i, 8)); write_reg(par, 0x49 + (i * 0x10), CURVE(i, 9)); write_reg(par, 0x4A + (i * 0x10), CURVE(i, 10)); write_reg(par, 0x4B + (i * 0x10), CURVE(i, 11)); write_reg(par, 0x4C + (i * 0x10), CURVE(i, 12)); } write_reg(par, 0x5D, (CURVE(1, 0) << 4) | CURVE(0, 0)); return 0; } #undef CURVE static struct fbtft_display display = { .regwidth = 8, .width = WIDTH, .height = HEIGHT, .gamma_num = 2, .gamma_len = 14, .gamma = DEFAULT_GAMMA, .fbtftops = { .init_display = init_display, .set_addr_win = set_addr_win, .set_gamma = set_gamma, }, }; FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8347d", &display); MODULE_ALIAS("spi:" DRVNAME); MODULE_ALIAS("platform:" DRVNAME); MODULE_ALIAS("spi:hx8347d"); MODULE_ALIAS("platform:hx8347d"); MODULE_DESCRIPTION("FB driver for the HX8347D LCD Controller"); MODULE_AUTHOR("Christian Vogelgsang"); MODULE_LICENSE("GPL"); |