2 * FB driver for the ST7735R LCD Controller
4 * Copyright (C) 2013 Noralf Tronnes
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
27 #define DRVNAME "fb_st7735r"
28 #define DEFAULT_GAMMA "0F 1A 0F 18 2F 28 20 22 1F 1B 23 37 00 07 02 10\n" \
29 "0F 1B 0F 17 33 2C 29 2E 30 30 39 3F 00 07 03 10"
32 static int default_init_sequence[] = {
33 /* SWRESET - Software reset */
37 /* SLPOUT - Sleep out & booster on */
41 /* FRMCTR1 - frame rate control: normal mode
42 frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) */
43 -1, 0xB1, 0x01, 0x2C, 0x2D,
45 /* FRMCTR2 - frame rate control: idle mode
46 frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) */
47 -1, 0xB2, 0x01, 0x2C, 0x2D,
49 /* FRMCTR3 - frame rate control - partial mode
50 dot inversion mode, line inversion mode */
51 -1, 0xB3, 0x01, 0x2C, 0x2D, 0x01, 0x2C, 0x2D,
53 /* INVCTR - display inversion control
57 /* PWCTR1 - Power Control
59 -1, 0xC0, 0xA2, 0x02, 0x84,
61 /* PWCTR2 - Power Control
62 VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD */
65 /* PWCTR3 - Power Control
66 Opamp current small, Boost frequency */
69 /* PWCTR4 - Power Control
70 BCLK/2, Opamp current small & Medium low */
73 /* PWCTR5 - Power Control */
76 /* VMCTR1 - Power Control */
79 /* INVOFF - Display inversion off */
82 /* COLMOD - Interface pixel format */
85 /* DISPON - Display On */
89 /* NORON - Partial off (Normal) */
97 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
99 fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
100 "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
103 write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
106 write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
109 write_reg(par, 0x2C);
115 static int set_var(struct fbtft_par *par)
117 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
119 /* MADCTL - Memory data access control
121 1. Mode selection pin SRGB
122 RGB H/W pin for color filter setting: 0=RGB, 1=BGR
124 RGB-BGR ORDER color filter panel: 0=RGB, 1=BGR */
125 switch (par->info->var.rotate) {
127 write_reg(par, 0x36, MX | MY | (par->bgr << 3));
130 write_reg(par, 0x36, MY | MV | (par->bgr << 3));
133 write_reg(par, 0x36, par->bgr << 3);
136 write_reg(par, 0x36, MX | MV | (par->bgr << 3));
145 VRF0P VOS0P PK0P PK1P PK2P PK3P PK4P PK5P PK6P PK7P PK8P PK9P SELV0P SELV1P SELV62P SELV63P
146 VRF0N VOS0N PK0N PK1N PK2N PK3N PK4N PK5N PK6N PK7N PK8N PK9N SELV0N SELV1N SELV62N SELV63N
148 #define CURVE(num, idx) curves[num*par->gamma.num_values + idx]
149 static int set_gamma(struct fbtft_par *par, unsigned long *curves)
153 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
156 for (i = 0; i < par->gamma.num_curves; i++)
157 for (j = 0; j < par->gamma.num_values; j++)
160 for (i = 0; i < par->gamma.num_curves; i++)
161 write_reg(par, 0xE0 + i,
162 CURVE(i, 0), CURVE(i, 1), CURVE(i, 2), CURVE(i, 3),
163 CURVE(i, 4), CURVE(i, 5), CURVE(i, 6), CURVE(i, 7),
164 CURVE(i, 8), CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
165 CURVE(i, 12), CURVE(i, 13), CURVE(i, 14), CURVE(i, 15));
172 static struct fbtft_display display = {
176 .init_sequence = default_init_sequence,
179 .gamma = DEFAULT_GAMMA,
181 .set_addr_win = set_addr_win,
183 .set_gamma = set_gamma,
186 FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7735r", &display);
188 MODULE_ALIAS("spi:" DRVNAME);
189 MODULE_ALIAS("platform:" DRVNAME);
190 MODULE_ALIAS("spi:st7735r");
191 MODULE_ALIAS("platform:st7735r");
193 MODULE_DESCRIPTION("FB driver for the ST7735R LCD Controller");
194 MODULE_AUTHOR("Noralf Tronnes");
195 MODULE_LICENSE("GPL");