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>
20 #include <video/mipi_display.h>
24 #define DRVNAME "fb_st7735r"
25 #define DEFAULT_GAMMA "0F 1A 0F 18 2F 28 20 22 1F 1B 23 37 00 07 02 10\n" \
26 "0F 1B 0F 17 33 2C 29 2E 30 30 39 3F 00 07 03 10"
28 static const s16 default_init_sequence[] = {
29 -1, MIPI_DCS_SOFT_RESET,
32 -1, MIPI_DCS_EXIT_SLEEP_MODE,
35 /* FRMCTR1 - frame rate control: normal mode
36 * 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)
43 -1, 0xB2, 0x01, 0x2C, 0x2D,
45 /* FRMCTR3 - frame rate control - partial mode
46 * dot inversion mode, line inversion mode
48 -1, 0xB3, 0x01, 0x2C, 0x2D, 0x01, 0x2C, 0x2D,
50 /* INVCTR - display inversion control
55 /* PWCTR1 - Power Control
58 -1, 0xC0, 0xA2, 0x02, 0x84,
60 /* PWCTR2 - Power Control
61 * VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD
65 /* PWCTR3 - Power Control
66 * Opamp current small, Boost frequency
70 /* PWCTR4 - Power Control
71 * BCLK/2, Opamp current small & Medium low
75 /* PWCTR5 - Power Control */
78 /* VMCTR1 - Power Control */
81 -1, MIPI_DCS_EXIT_INVERT_MODE,
83 -1, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT,
85 -1, MIPI_DCS_SET_DISPLAY_ON,
88 -1, MIPI_DCS_ENTER_NORMAL_MODE,
95 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
97 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
98 xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
100 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
101 ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
103 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
109 static int set_var(struct fbtft_par *par)
111 /* MADCTL - Memory data access control
113 * 1. Mode selection pin SRGB
114 * RGB H/W pin for color filter setting: 0=RGB, 1=BGR
116 * RGB-BGR ORDER color filter panel: 0=RGB, 1=BGR
118 switch (par->info->var.rotate) {
120 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
121 MX | MY | (par->bgr << 3));
124 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
125 MY | MV | (par->bgr << 3));
128 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
132 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
133 MX | MV | (par->bgr << 3));
141 * Gamma string format:
142 * VRF0P VOS0P PK0P PK1P PK2P PK3P PK4P PK5P PK6P PK7P PK8P PK9P SELV0P SELV1P SELV62P SELV63P
143 * VRF0N VOS0N PK0N PK1N PK2N PK3N PK4N PK5N PK6N PK7N PK8N PK9N SELV0N SELV1N SELV62N SELV63N
145 #define CURVE(num, idx) curves[num * par->gamma.num_values + idx]
146 static int set_gamma(struct fbtft_par *par, u32 *curves)
151 for (i = 0; i < par->gamma.num_curves; i++)
152 for (j = 0; j < par->gamma.num_values; j++)
155 for (i = 0; i < par->gamma.num_curves; i++)
156 write_reg(par, 0xE0 + i,
157 CURVE(i, 0), CURVE(i, 1), CURVE(i, 2), CURVE(i, 3),
158 CURVE(i, 4), CURVE(i, 5), CURVE(i, 6), CURVE(i, 7),
159 CURVE(i, 8), CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
160 CURVE(i, 12), CURVE(i, 13), CURVE(i, 14), CURVE(i, 15));
166 static struct fbtft_display display = {
170 .init_sequence = default_init_sequence,
173 .gamma = DEFAULT_GAMMA,
175 .set_addr_win = set_addr_win,
177 .set_gamma = set_gamma,
181 FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7735r", &display);
183 MODULE_ALIAS("spi:" DRVNAME);
184 MODULE_ALIAS("platform:" DRVNAME);
185 MODULE_ALIAS("spi:st7735r");
186 MODULE_ALIAS("platform:st7735r");
188 MODULE_DESCRIPTION("FB driver for the ST7735R LCD Controller");
189 MODULE_AUTHOR("Noralf Tronnes");
190 MODULE_LICENSE("GPL");