2 * FB driver for the HX8347D LCD Controller
4 * Copyright (C) 2013 Christian Vogelgsang
6 * Based on driver code found here: https://github.com/watterott/r61505u-Adapter
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.
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.
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/delay.h>
26 #define DRVNAME "fb_hx8347d"
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"
32 static int init_display(struct fbtft_par *par)
34 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
36 par->fbtftops.reset(par);
39 write_reg(par, 0xEA, 0x00);
40 write_reg(par, 0xEB, 0x20);
41 write_reg(par, 0xEC, 0x0C);
42 write_reg(par, 0xED, 0xC4);
43 write_reg(par, 0xE8, 0x40);
44 write_reg(par, 0xE9, 0x38);
45 write_reg(par, 0xF1, 0x01);
46 write_reg(par, 0xF2, 0x10);
47 write_reg(par, 0x27, 0xA3);
50 write_reg(par, 0x1B, 0x1B);
51 write_reg(par, 0x1A, 0x01);
52 write_reg(par, 0x24, 0x2F);
53 write_reg(par, 0x25, 0x57);
56 write_reg(par, 0x23, 0x8D); /* for flicker adjust */
59 write_reg(par, 0x18, 0x36);
60 write_reg(par, 0x19, 0x01); /* start osc */
61 write_reg(par, 0x01, 0x00); /* wakeup */
62 write_reg(par, 0x1F, 0x88);
64 write_reg(par, 0x1F, 0x80);
66 write_reg(par, 0x1F, 0x90);
68 write_reg(par, 0x1F, 0xD0);
72 write_reg(par, 0x17, 0x05); /* 65k */
74 /*panel characteristic */
75 write_reg(par, 0x36, 0x00);
78 write_reg(par, 0x28, 0x38);
80 write_reg(par, 0x28, 0x3C);
83 write_reg(par, 0x16, 0x60 | (par->bgr << 3));
88 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
90 write_reg(par, 0x02, (xs >> 8) & 0xFF);
91 write_reg(par, 0x03, xs & 0xFF);
92 write_reg(par, 0x04, (xe >> 8) & 0xFF);
93 write_reg(par, 0x05, xe & 0xFF);
94 write_reg(par, 0x06, (ys >> 8) & 0xFF);
95 write_reg(par, 0x07, ys & 0xFF);
96 write_reg(par, 0x08, (ye >> 8) & 0xFF);
97 write_reg(par, 0x09, ye & 0xFF);
103 VRP0 VRP1 VRP2 VRP3 VRP4 VRP5 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 CGM
104 VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM
106 #define CURVE(num, idx) curves[num * par->gamma.num_values + idx]
107 static int set_gamma(struct fbtft_par *par, unsigned long *curves)
109 unsigned long mask[] = {
110 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f,
111 0x1f, 0x1f, 0x1f, 0x0f,
116 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
119 for (i = 0; i < par->gamma.num_curves; i++)
120 for (j = 0; j < par->gamma.num_values; j++) {
122 CURVE(i, j) &= mask[j];
125 if (acc == 0) /* skip if all values are zero */
128 for (i = 0; i < par->gamma.num_curves; i++) {
129 write_reg(par, 0x40 + (i * 0x10), CURVE(i, 0));
130 write_reg(par, 0x41 + (i * 0x10), CURVE(i, 1));
131 write_reg(par, 0x42 + (i * 0x10), CURVE(i, 2));
132 write_reg(par, 0x43 + (i * 0x10), CURVE(i, 3));
133 write_reg(par, 0x44 + (i * 0x10), CURVE(i, 4));
134 write_reg(par, 0x45 + (i * 0x10), CURVE(i, 5));
135 write_reg(par, 0x46 + (i * 0x10), CURVE(i, 6));
136 write_reg(par, 0x47 + (i * 0x10), CURVE(i, 7));
137 write_reg(par, 0x48 + (i * 0x10), CURVE(i, 8));
138 write_reg(par, 0x49 + (i * 0x10), CURVE(i, 9));
139 write_reg(par, 0x4A + (i * 0x10), CURVE(i, 10));
140 write_reg(par, 0x4B + (i * 0x10), CURVE(i, 11));
141 write_reg(par, 0x4C + (i * 0x10), CURVE(i, 12));
143 write_reg(par, 0x5D, (CURVE(1, 0) << 4) | CURVE(0, 0));
149 static struct fbtft_display display = {
155 .gamma = DEFAULT_GAMMA,
157 .init_display = init_display,
158 .set_addr_win = set_addr_win,
159 .set_gamma = set_gamma,
163 FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8347d", &display);
165 MODULE_ALIAS("spi:" DRVNAME);
166 MODULE_ALIAS("platform:" DRVNAME);
167 MODULE_ALIAS("spi:hx8347d");
168 MODULE_ALIAS("platform:hx8347d");
170 MODULE_DESCRIPTION("FB driver for the HX8347D LCD Controller");
171 MODULE_AUTHOR("Christian Vogelgsang");
172 MODULE_LICENSE("GPL");