1 /* 2 * FB driver for the HX8347D LCD Controller 3 * 4 * Copyright (C) 2013 Christian Vogelgsang 5 * 6 * Based on driver code found here: https://github.com/watterott/r61505u-Adapter 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/init.h> 22 #include <linux/delay.h> 23 24 #include "fbtft.h" 25 26 #define DRVNAME "fb_hx8347d" 27 #define WIDTH 320 28 #define HEIGHT 240 29 #define DEFAULT_GAMMA "0 0 0 0 0 0 0 0 0 0 0 0 0 0\n" \ 30 "0 0 0 0 0 0 0 0 0 0 0 0 0 0" 31 32 static int init_display(struct fbtft_par *par) 33 { 34 par->fbtftops.reset(par); 35 36 /* driving ability */ 37 write_reg(par, 0xEA, 0x00); 38 write_reg(par, 0xEB, 0x20); 39 write_reg(par, 0xEC, 0x0C); 40 write_reg(par, 0xED, 0xC4); 41 write_reg(par, 0xE8, 0x40); 42 write_reg(par, 0xE9, 0x38); 43 write_reg(par, 0xF1, 0x01); 44 write_reg(par, 0xF2, 0x10); 45 write_reg(par, 0x27, 0xA3); 46 47 /* power voltage */ 48 write_reg(par, 0x1B, 0x1B); 49 write_reg(par, 0x1A, 0x01); 50 write_reg(par, 0x24, 0x2F); 51 write_reg(par, 0x25, 0x57); 52 53 /* VCOM offset */ 54 write_reg(par, 0x23, 0x8D); /* for flicker adjust */ 55 56 /* power on */ 57 write_reg(par, 0x18, 0x36); 58 write_reg(par, 0x19, 0x01); /* start osc */ 59 write_reg(par, 0x01, 0x00); /* wakeup */ 60 write_reg(par, 0x1F, 0x88); 61 mdelay(5); 62 write_reg(par, 0x1F, 0x80); 63 mdelay(5); 64 write_reg(par, 0x1F, 0x90); 65 mdelay(5); 66 write_reg(par, 0x1F, 0xD0); 67 mdelay(5); 68 69 /* color selection */ 70 write_reg(par, 0x17, 0x05); /* 65k */ 71 72 /*panel characteristic */ 73 write_reg(par, 0x36, 0x00); 74 75 /*display on */ 76 write_reg(par, 0x28, 0x38); 77 mdelay(40); 78 write_reg(par, 0x28, 0x3C); 79 80 /* orientation */ 81 write_reg(par, 0x16, 0x60 | (par->bgr << 3)); 82 83 return 0; 84 } 85 86 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 87 { 88 write_reg(par, 0x02, (xs >> 8) & 0xFF); 89 write_reg(par, 0x03, xs & 0xFF); 90 write_reg(par, 0x04, (xe >> 8) & 0xFF); 91 write_reg(par, 0x05, xe & 0xFF); 92 write_reg(par, 0x06, (ys >> 8) & 0xFF); 93 write_reg(par, 0x07, ys & 0xFF); 94 write_reg(par, 0x08, (ye >> 8) & 0xFF); 95 write_reg(par, 0x09, ye & 0xFF); 96 write_reg(par, 0x22); 97 } 98 99 /* 100 * Gamma string format: 101 * VRP0 VRP1 VRP2 VRP3 VRP4 VRP5 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 CGM 102 * VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM 103 */ 104 #define CURVE(num, idx) curves[num * par->gamma.num_values + idx] 105 static int set_gamma(struct fbtft_par *par, u32 *curves) 106 { 107 unsigned long mask[] = { 108 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f, 109 0x1f, 0x1f, 0x1f, 0x0f, 110 }; 111 int i, j; 112 int acc = 0; 113 114 /* apply mask */ 115 for (i = 0; i < par->gamma.num_curves; i++) 116 for (j = 0; j < par->gamma.num_values; j++) { 117 acc += CURVE(i, j); 118 CURVE(i, j) &= mask[j]; 119 } 120 121 if (acc == 0) /* skip if all values are zero */ 122 return 0; 123 124 for (i = 0; i < par->gamma.num_curves; i++) { 125 write_reg(par, 0x40 + (i * 0x10), CURVE(i, 0)); 126 write_reg(par, 0x41 + (i * 0x10), CURVE(i, 1)); 127 write_reg(par, 0x42 + (i * 0x10), CURVE(i, 2)); 128 write_reg(par, 0x43 + (i * 0x10), CURVE(i, 3)); 129 write_reg(par, 0x44 + (i * 0x10), CURVE(i, 4)); 130 write_reg(par, 0x45 + (i * 0x10), CURVE(i, 5)); 131 write_reg(par, 0x46 + (i * 0x10), CURVE(i, 6)); 132 write_reg(par, 0x47 + (i * 0x10), CURVE(i, 7)); 133 write_reg(par, 0x48 + (i * 0x10), CURVE(i, 8)); 134 write_reg(par, 0x49 + (i * 0x10), CURVE(i, 9)); 135 write_reg(par, 0x4A + (i * 0x10), CURVE(i, 10)); 136 write_reg(par, 0x4B + (i * 0x10), CURVE(i, 11)); 137 write_reg(par, 0x4C + (i * 0x10), CURVE(i, 12)); 138 } 139 write_reg(par, 0x5D, (CURVE(1, 0) << 4) | CURVE(0, 0)); 140 141 return 0; 142 } 143 144 #undef CURVE 145 146 static struct fbtft_display display = { 147 .regwidth = 8, 148 .width = WIDTH, 149 .height = HEIGHT, 150 .gamma_num = 2, 151 .gamma_len = 14, 152 .gamma = DEFAULT_GAMMA, 153 .fbtftops = { 154 .init_display = init_display, 155 .set_addr_win = set_addr_win, 156 .set_gamma = set_gamma, 157 }, 158 }; 159 160 FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8347d", &display); 161 162 MODULE_ALIAS("spi:" DRVNAME); 163 MODULE_ALIAS("platform:" DRVNAME); 164 MODULE_ALIAS("spi:hx8347d"); 165 MODULE_ALIAS("platform:hx8347d"); 166 167 MODULE_DESCRIPTION("FB driver for the HX8347D LCD Controller"); 168 MODULE_AUTHOR("Christian Vogelgsang"); 169 MODULE_LICENSE("GPL"); 170