1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*
* FB driver for the ILI9340 LCD Controller
*
* Copyright (C) 2013 Noralf Tronnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include "fbtft.h"
#define DRVNAME "fb_ili9340"
#define WIDTH 240
#define HEIGHT 320
/* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */
static int init_display(struct fbtft_par *par)
{
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
par->fbtftops.reset(par);
write_reg(par, 0xEF, 0x03, 0x80, 0x02);
write_reg(par, 0xCF, 0x00, 0XC1, 0X30);
write_reg(par, 0xED, 0x64, 0x03, 0X12, 0X81);
write_reg(par, 0xE8, 0x85, 0x00, 0x78);
write_reg(par, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02);
write_reg(par, 0xF7, 0x20);
write_reg(par, 0xEA, 0x00, 0x00);
/* Power Control 1 */
write_reg(par, 0xC0, 0x23);
/* Power Control 2 */
write_reg(par, 0xC1, 0x10);
/* VCOM Control 1 */
write_reg(par, 0xC5, 0x3e, 0x28);
/* VCOM Control 2 */
write_reg(par, 0xC7, 0x86);
/* COLMOD: Pixel Format Set */
/* 16 bits/pixel */
write_reg(par, 0x3A, 0x55);
/* Frame Rate Control */
/* Division ratio = fosc, Frame Rate = 79Hz */
write_reg(par, 0xB1, 0x00, 0x18);
/* Display Function Control */
write_reg(par, 0xB6, 0x08, 0x82, 0x27);
/* Gamma Function Disable */
write_reg(par, 0xF2, 0x00);
/* Gamma curve selected */
write_reg(par, 0x26, 0x01);
/* Positive Gamma Correction */
write_reg(par, 0xE0,
0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1,
0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00);
/* Negative Gamma Correction */
write_reg(par, 0xE1,
0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1,
0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F);
/* Sleep OUT */
write_reg(par, 0x11);
mdelay(120);
/* Display ON */
write_reg(par, 0x29);
return 0;
}
static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
/* Column address */
write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
/* Row address */
write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
/* Memory write */
write_reg(par, 0x2C);
}
#define ILI9340_MADCTL_MV 0x20
#define ILI9340_MADCTL_MX 0x40
#define ILI9340_MADCTL_MY 0x80
static int set_var(struct fbtft_par *par)
{
u8 val;
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
switch (par->info->var.rotate) {
case 270:
val = ILI9340_MADCTL_MV;
break;
case 180:
val = ILI9340_MADCTL_MY;
break;
case 90:
val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX;
break;
default:
val = ILI9340_MADCTL_MX;
break;
}
/* Memory Access Control */
write_reg(par, 0x36, val | (par->bgr << 3));
return 0;
}
static struct fbtft_display display = {
.regwidth = 8,
.width = WIDTH,
.height = HEIGHT,
.fbtftops = {
.init_display = init_display,
.set_addr_win = set_addr_win,
.set_var = set_var,
},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display);
MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:ili9340");
MODULE_ALIAS("platform:ili9340");
MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller");
MODULE_AUTHOR("Noralf Tronnes");
MODULE_LICENSE("GPL");
|