1 /*
2 * FB driver for the ILI9481 LCD Controller
3 *
4 * Copyright (c) 2014 Petr Olivka
5 * Copyright (c) 2013 Noralf Tronnes
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22
23 #include "fbtft.h"
24
25 #define DRVNAME "fb_ili9481"
26 #define WIDTH 320
27 #define HEIGHT 480
28
29 static int default_init_sequence[] = {
30
31 /* SLP_OUT - Sleep out */
32 -1, 0x11,
33 -2, 50,
34 /* Power setting */
35 -1, 0xD0, 0x07, 0x42, 0x18,
36 /* VCOM */
37 -1, 0xD1, 0x00, 0x07, 0x10,
38 /* Power setting for norm. mode */
39 -1, 0xD2, 0x01, 0x02,
40 /* Panel driving setting */
41 -1, 0xC0, 0x10, 0x3B, 0x00, 0x02, 0x11,
42 /* Frame rate & inv. */
43 -1, 0xC5, 0x03,
44 /* Pixel format */
45 -1, 0x3A, 0x55,
46 /* Gamma */
47 -1, 0xC8, 0x00, 0x32, 0x36, 0x45, 0x06, 0x16,
48 0x37, 0x75, 0x77, 0x54, 0x0C, 0x00,
49 /* DISP_ON */
50 -1, 0x29,
51 -3
52 };
53
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)54 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
55 {
56 /* column address */
57 write_reg(par, 0x2a, xs >> 8, xs & 0xff, xe >> 8, xe & 0xff);
58
59 /* Row address */
60 write_reg(par, 0x2b, ys >> 8, ys & 0xff, ye >> 8, ye & 0xff);
61
62 /* memory write */
63 write_reg(par, 0x2c);
64 }
65
66 #define HFLIP 0x01
67 #define VFLIP 0x02
68 #define ROWxCOL 0x20
set_var(struct fbtft_par * par)69 static int set_var(struct fbtft_par *par)
70 {
71 switch (par->info->var.rotate) {
72 case 270:
73 write_reg(par, 0x36, ROWxCOL | HFLIP | VFLIP | (par->bgr << 3));
74 break;
75 case 180:
76 write_reg(par, 0x36, VFLIP | (par->bgr << 3));
77 break;
78 case 90:
79 write_reg(par, 0x36, ROWxCOL | (par->bgr << 3));
80 break;
81 default:
82 write_reg(par, 0x36, HFLIP | (par->bgr << 3));
83 break;
84 }
85
86 return 0;
87 }
88
89 static struct fbtft_display display = {
90 .regwidth = 8,
91 .width = WIDTH,
92 .height = HEIGHT,
93 .init_sequence = default_init_sequence,
94 .fbtftops = {
95 .set_addr_win = set_addr_win,
96 .set_var = set_var,
97 },
98 };
99
100 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9481", &display);
101
102 MODULE_ALIAS("spi:" DRVNAME);
103 MODULE_ALIAS("platform:" DRVNAME);
104 MODULE_ALIAS("spi:ili9481");
105 MODULE_ALIAS("platform:ili9481");
106
107 MODULE_DESCRIPTION("FB driver for the ILI9481 LCD Controller");
108 MODULE_AUTHOR("Petr Olivka");
109 MODULE_LICENSE("GPL");
110