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.
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
23 #define DRVNAME "fb_st7735r"
24 #define DEFAULT_GAMMA "0F 1A 0F 18 2F 28 20 22 1F 1B 23 37 00 07 02 10\n" \
25 "0F 1B 0F 17 33 2C 29 2E 30 30 39 3F 00 07 03 10"
27 static int default_init_sequence[] = {
28 /* SWRESET - Software reset */
32 /* SLPOUT - Sleep out & booster on */
36 /* FRMCTR1 - frame rate control: normal mode
37 frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) */
38 -1, 0xB1, 0x01, 0x2C, 0x2D,
40 /* FRMCTR2 - frame rate control: idle mode
41 frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) */
42 -1, 0xB2, 0x01, 0x2C, 0x2D,
44 /* FRMCTR3 - frame rate control - partial mode
45 dot inversion mode, line inversion mode */
46 -1, 0xB3, 0x01, 0x2C, 0x2D, 0x01, 0x2C, 0x2D,
48 /* INVCTR - display inversion control
52 /* PWCTR1 - Power Control
54 -1, 0xC0, 0xA2, 0x02, 0x84,
56 /* PWCTR2 - Power Control
57 VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD */
60 /* PWCTR3 - Power Control
61 Opamp current small, Boost frequency */
64 /* PWCTR4 - Power Control
65 BCLK/2, Opamp current small & Medium low */
68 /* PWCTR5 - Power Control */
71 /* VMCTR1 - Power Control */
74 /* INVOFF - Display inversion off */
77 /* COLMOD - Interface pixel format */
80 /* DISPON - Display On */
84 /* NORON - Partial off (Normal) */
92 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
95 write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
98 write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
101 write_reg(par, 0x2C);
107 static int set_var(struct fbtft_par *par)
109 /* MADCTL - Memory data access control
111 1. Mode selection pin SRGB
112 RGB H/W pin for color filter setting: 0=RGB, 1=BGR
114 RGB-BGR ORDER color filter panel: 0=RGB, 1=BGR */
115 switch (par->info->var.rotate) {
117 write_reg(par, 0x36, MX | MY | (par->bgr << 3));
120 write_reg(par, 0x36, MY | MV | (par->bgr << 3));
123 write_reg(par, 0x36, par->bgr << 3);
126 write_reg(par, 0x36, MX | MV | (par->bgr << 3));
135 VRF0P VOS0P PK0P PK1P PK2P PK3P PK4P PK5P PK6P PK7P PK8P PK9P SELV0P SELV1P SELV62P SELV63P
136 VRF0N VOS0N PK0N PK1N PK2N PK3N PK4N PK5N PK6N PK7N PK8N PK9N SELV0N SELV1N SELV62N SELV63N
138 #define CURVE(num, idx) curves[num * par->gamma.num_values + idx]
139 static int set_gamma(struct fbtft_par *par, unsigned long *curves)
144 for (i = 0; i < par->gamma.num_curves; i++)
145 for (j = 0; j < par->gamma.num_values; j++)
148 for (i = 0; i < par->gamma.num_curves; i++)
149 write_reg(par, 0xE0 + i,
150 CURVE(i, 0), CURVE(i, 1), CURVE(i, 2), CURVE(i, 3),
151 CURVE(i, 4), CURVE(i, 5), CURVE(i, 6), CURVE(i, 7),
152 CURVE(i, 8), CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
153 CURVE(i, 12), CURVE(i, 13), CURVE(i, 14), CURVE(i, 15));
159 static struct fbtft_display display = {
163 .init_sequence = default_init_sequence,
166 .gamma = DEFAULT_GAMMA,
168 .set_addr_win = set_addr_win,
170 .set_gamma = set_gamma,
174 FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7735r", &display);
176 MODULE_ALIAS("spi:" DRVNAME);
177 MODULE_ALIAS("platform:" DRVNAME);
178 MODULE_ALIAS("spi:st7735r");
179 MODULE_ALIAS("platform:st7735r");
181 MODULE_DESCRIPTION("FB driver for the ST7735R LCD Controller");
182 MODULE_AUTHOR("Noralf Tronnes");
183 MODULE_LICENSE("GPL");