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.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
30 #define DRVNAME "fb_hx8347d"
33 #define DEFAULT_GAMMA "0 0 0 0 0 0 0 0 0 0 0 0 0 0\n" \
34 "0 0 0 0 0 0 0 0 0 0 0 0 0 0"
37 static int init_display(struct fbtft_par *par)
39 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
41 par->fbtftops.reset(par);
44 write_reg(par, 0xEA, 0x00);
45 write_reg(par, 0xEB, 0x20);
46 write_reg(par, 0xEC, 0x0C);
47 write_reg(par, 0xED, 0xC4);
48 write_reg(par, 0xE8, 0x40);
49 write_reg(par, 0xE9, 0x38);
50 write_reg(par, 0xF1, 0x01);
51 write_reg(par, 0xF2, 0x10);
52 write_reg(par, 0x27, 0xA3);
55 write_reg(par, 0x1B, 0x1B);
56 write_reg(par, 0x1A, 0x01);
57 write_reg(par, 0x24, 0x2F);
58 write_reg(par, 0x25, 0x57);
61 write_reg(par, 0x23, 0x8D); /* for flicker adjust */
64 write_reg(par, 0x18, 0x36);
65 write_reg(par, 0x19, 0x01); /* start osc */
66 write_reg(par, 0x01, 0x00); /* wakeup */
67 write_reg(par, 0x1F, 0x88);
69 write_reg(par, 0x1F, 0x80);
71 write_reg(par, 0x1F, 0x90);
73 write_reg(par, 0x1F, 0xD0);
77 write_reg(par, 0x17, 0x05); /* 65k */
79 /*panel characteristic */
80 write_reg(par, 0x36, 0x00);
83 write_reg(par, 0x28, 0x38);
85 write_reg(par, 0x28, 0x3C);
88 write_reg(par, 0x16, 0x60 | (par->bgr << 3));
93 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
95 fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
96 "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
98 write_reg(par, 0x02, (xs >> 8) & 0xFF);
99 write_reg(par, 0x03, xs & 0xFF);
100 write_reg(par, 0x04, (xe >> 8) & 0xFF);
101 write_reg(par, 0x05, xe & 0xFF);
102 write_reg(par, 0x06, (ys >> 8) & 0xFF);
103 write_reg(par, 0x07, ys & 0xFF);
104 write_reg(par, 0x08, (ye >> 8) & 0xFF);
105 write_reg(par, 0x09, ye & 0xFF);
106 write_reg(par, 0x22);
111 VRP0 VRP1 VRP2 VRP3 VRP4 VRP5 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 CGM
112 VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM
114 #define CURVE(num, idx) curves[num*par->gamma.num_values + idx]
115 static int set_gamma(struct fbtft_par *par, unsigned long *curves)
117 unsigned long mask[] = {
118 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f,
119 0x1f, 0x1f, 0x1f, 0x0f,
124 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
127 for (i = 0; i < par->gamma.num_curves; i++)
128 for (j = 0; j < par->gamma.num_values; j++) {
130 CURVE(i, j) &= mask[j];
133 if (acc == 0) /* skip if all values are zero */
136 for (i = 0; i < par->gamma.num_curves; i++) {
137 write_reg(par, 0x40 + (i * 0x10), CURVE(i, 0));
138 write_reg(par, 0x41 + (i * 0x10), CURVE(i, 1));
139 write_reg(par, 0x42 + (i * 0x10), CURVE(i, 2));
140 write_reg(par, 0x43 + (i * 0x10), CURVE(i, 3));
141 write_reg(par, 0x44 + (i * 0x10), CURVE(i, 4));
142 write_reg(par, 0x45 + (i * 0x10), CURVE(i, 5));
143 write_reg(par, 0x46 + (i * 0x10), CURVE(i, 6));
144 write_reg(par, 0x47 + (i * 0x10), CURVE(i, 7));
145 write_reg(par, 0x48 + (i * 0x10), CURVE(i, 8));
146 write_reg(par, 0x49 + (i * 0x10), CURVE(i, 9));
147 write_reg(par, 0x4A + (i * 0x10), CURVE(i, 10));
148 write_reg(par, 0x4B + (i * 0x10), CURVE(i, 11));
149 write_reg(par, 0x4C + (i * 0x10), CURVE(i, 12));
151 write_reg(par, 0x5D, (CURVE(1, 0) << 4) | CURVE(0, 0));
158 static struct fbtft_display display = {
164 .gamma = DEFAULT_GAMMA,
166 .init_display = init_display,
167 .set_addr_win = set_addr_win,
168 .set_gamma = set_gamma,
171 FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8347d", &display);
173 MODULE_ALIAS("spi:" DRVNAME);
174 MODULE_ALIAS("platform:" DRVNAME);
175 MODULE_ALIAS("spi:hx8347d");
176 MODULE_ALIAS("platform:hx8347d");
178 MODULE_DESCRIPTION("FB driver for the HX8347D LCD Controller");
179 MODULE_AUTHOR("Christian Vogelgsang");
180 MODULE_LICENSE("GPL");