1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * FB driver for the ILI9486 LCD Controller
4 *
5 * Copyright (C) 2014 Noralf Tronnes
6 */
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <video/mipi_display.h>
12
13 #include "fbtft.h"
14
15 #define DRVNAME "fb_ili9486"
16 #define WIDTH 320
17 #define HEIGHT 480
18
19 /* this init sequence matches PiScreen */
20 static const s16 default_init_sequence[] = {
21 /* Interface Mode Control */
22 -1, 0xb0, 0x0,
23 -1, MIPI_DCS_EXIT_SLEEP_MODE,
24 -2, 250,
25 /* Interface Pixel Format */
26 -1, MIPI_DCS_SET_PIXEL_FORMAT, 0x55,
27 /* Power Control 3 */
28 -1, 0xC2, 0x44,
29 /* VCOM Control 1 */
30 -1, 0xC5, 0x00, 0x00, 0x00, 0x00,
31 /* PGAMCTRL(Positive Gamma Control) */
32 -1, 0xE0, 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
33 0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x00,
34 /* NGAMCTRL(Negative Gamma Control) */
35 -1, 0xE1, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
36 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
37 /* Digital Gamma Control 1 */
38 -1, 0xE2, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
39 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
40 -1, MIPI_DCS_EXIT_SLEEP_MODE,
41 -1, MIPI_DCS_SET_DISPLAY_ON,
42 /* end marker */
43 -3
44 };
45
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)46 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
47 {
48 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
49 xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
50
51 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
52 ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
53
54 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
55 }
56
set_var(struct fbtft_par * par)57 static int set_var(struct fbtft_par *par)
58 {
59 switch (par->info->var.rotate) {
60 case 0:
61 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
62 0x80 | (par->bgr << 3));
63 break;
64 case 90:
65 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
66 0x20 | (par->bgr << 3));
67 break;
68 case 180:
69 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
70 0x40 | (par->bgr << 3));
71 break;
72 case 270:
73 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
74 0xE0 | (par->bgr << 3));
75 break;
76 default:
77 break;
78 }
79
80 return 0;
81 }
82
83 static struct fbtft_display display = {
84 .regwidth = 8,
85 .width = WIDTH,
86 .height = HEIGHT,
87 .init_sequence = default_init_sequence,
88 .fbtftops = {
89 .set_addr_win = set_addr_win,
90 .set_var = set_var,
91 },
92 };
93
94 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9486", &display);
95
96 MODULE_ALIAS("spi:" DRVNAME);
97 MODULE_ALIAS("platform:" DRVNAME);
98 MODULE_ALIAS("spi:ili9486");
99 MODULE_ALIAS("platform:ili9486");
100
101 MODULE_DESCRIPTION("FB driver for the ILI9486 LCD Controller");
102 MODULE_AUTHOR("Noralf Tronnes");
103 MODULE_LICENSE("GPL");
104