Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 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. |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 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 | |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 32 | static int init_display(struct fbtft_par *par) |
| 33 | { |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 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 | { |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 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 | */ |
Anish Bhatt | 94c0a54 | 2015-09-03 00:53:37 -0700 | [diff] [blame] | 104 | #define CURVE(num, idx) curves[num * par->gamma.num_values + idx] |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 105 | static int set_gamma(struct fbtft_par *par, unsigned long *curves) |
| 106 | { |
| 107 | unsigned long mask[] = { |
Geert Uytterhoeven | 153fe94 | 2015-03-20 16:21:58 +0100 | [diff] [blame] | 108 | 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f, |
| 109 | 0x1f, 0x1f, 0x1f, 0x0f, |
| 110 | }; |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 111 | int i, j; |
| 112 | int acc = 0; |
| 113 | |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 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 | #undef CURVE |
| 144 | |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 145 | static struct fbtft_display display = { |
| 146 | .regwidth = 8, |
| 147 | .width = WIDTH, |
| 148 | .height = HEIGHT, |
| 149 | .gamma_num = 2, |
| 150 | .gamma_len = 14, |
| 151 | .gamma = DEFAULT_GAMMA, |
| 152 | .fbtftops = { |
| 153 | .init_display = init_display, |
| 154 | .set_addr_win = set_addr_win, |
| 155 | .set_gamma = set_gamma, |
| 156 | }, |
| 157 | }; |
Anish Bhatt | 1014c2c | 2015-09-03 00:53:36 -0700 | [diff] [blame] | 158 | |
Thomas Petazzoni | 66c06c8 | 2014-12-31 10:11:13 +0100 | [diff] [blame] | 159 | FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8347d", &display); |
| 160 | |
| 161 | MODULE_ALIAS("spi:" DRVNAME); |
| 162 | MODULE_ALIAS("platform:" DRVNAME); |
| 163 | MODULE_ALIAS("spi:hx8347d"); |
| 164 | MODULE_ALIAS("platform:hx8347d"); |
| 165 | |
| 166 | MODULE_DESCRIPTION("FB driver for the HX8347D LCD Controller"); |
| 167 | MODULE_AUTHOR("Christian Vogelgsang"); |
| 168 | MODULE_LICENSE("GPL"); |