1 /*
2 * FB driver for the ILI9486 LCD Controller
3 *
4 * Copyright (C) 2014 Noralf Tronnes
5 *
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.
10 *
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.
15 */
16
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <video/mipi_display.h>
21
22 #include "fbtft.h"
23
24 #define DRVNAME "fb_ili9486"
25 #define WIDTH 320
26 #define HEIGHT 480
27
28 /* this init sequence matches PiScreen */
29 static const s16 default_init_sequence[] = {
30 /* Interface Mode Control */
31 -1, 0xb0, 0x0,
32 -1, MIPI_DCS_EXIT_SLEEP_MODE,
33 -2, 250,
34 /* Interface Pixel Format */
35 -1, MIPI_DCS_SET_PIXEL_FORMAT, 0x55,
36 /* Power Control 3 */
37 -1, 0xC2, 0x44,
38 /* VCOM Control 1 */
39 -1, 0xC5, 0x00, 0x00, 0x00, 0x00,
40 /* PGAMCTRL(Positive Gamma Control) */
41 -1, 0xE0, 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
42 0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x00,
43 /* NGAMCTRL(Negative Gamma Control) */
44 -1, 0xE1, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
45 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
46 /* Digital Gamma Control 1 */
47 -1, 0xE2, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
48 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
49 -1, MIPI_DCS_EXIT_SLEEP_MODE,
50 -1, MIPI_DCS_SET_DISPLAY_ON,
51 /* end marker */
52 -3
53 };
54
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)55 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
56 {
57 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
58 xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
59
60 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
61 ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
62
63 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
64 }
65
set_var(struct fbtft_par * par)66 static int set_var(struct fbtft_par *par)
67 {
68 switch (par->info->var.rotate) {
69 case 0:
70 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
71 0x80 | (par->bgr << 3));
72 break;
73 case 90:
74 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
75 0x20 | (par->bgr << 3));
76 break;
77 case 180:
78 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
79 0x40 | (par->bgr << 3));
80 break;
81 case 270:
82 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
83 0xE0 | (par->bgr << 3));
84 break;
85 default:
86 break;
87 }
88
89 return 0;
90 }
91
92 static struct fbtft_display display = {
93 .regwidth = 8,
94 .width = WIDTH,
95 .height = HEIGHT,
96 .init_sequence = default_init_sequence,
97 .fbtftops = {
98 .set_addr_win = set_addr_win,
99 .set_var = set_var,
100 },
101 };
102
103 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9486", &display);
104
105 MODULE_ALIAS("spi:" DRVNAME);
106 MODULE_ALIAS("platform:" DRVNAME);
107 MODULE_ALIAS("spi:ili9486");
108 MODULE_ALIAS("platform:ili9486");
109
110 MODULE_DESCRIPTION("FB driver for the ILI9486 LCD Controller");
111 MODULE_AUTHOR("Noralf Tronnes");
112 MODULE_LICENSE("GPL");
113