1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * FB driver for the ILI9481 LCD Controller
4 *
5 * Copyright (c) 2014 Petr Olivka
6 * Copyright (c) 2013 Noralf Tronnes
7 */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <video/mipi_display.h>
14
15 #include "fbtft.h"
16
17 #define DRVNAME "fb_ili9481"
18 #define WIDTH 320
19 #define HEIGHT 480
20
21 static const s16 default_init_sequence[] = {
22 /* SLP_OUT - Sleep out */
23 -1, MIPI_DCS_EXIT_SLEEP_MODE,
24 -2, 50,
25 /* Power setting */
26 -1, 0xD0, 0x07, 0x42, 0x18,
27 /* VCOM */
28 -1, 0xD1, 0x00, 0x07, 0x10,
29 /* Power setting for norm. mode */
30 -1, 0xD2, 0x01, 0x02,
31 /* Panel driving setting */
32 -1, 0xC0, 0x10, 0x3B, 0x00, 0x02, 0x11,
33 /* Frame rate & inv. */
34 -1, 0xC5, 0x03,
35 /* Pixel format */
36 -1, MIPI_DCS_SET_PIXEL_FORMAT, 0x55,
37 /* Gamma */
38 -1, 0xC8, 0x00, 0x32, 0x36, 0x45, 0x06, 0x16,
39 0x37, 0x75, 0x77, 0x54, 0x0C, 0x00,
40 /* DISP_ON */
41 -1, MIPI_DCS_SET_DISPLAY_ON,
42 -3
43 };
44
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)45 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
46 {
47 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
48 xs >> 8, xs & 0xff, xe >> 8, xe & 0xff);
49
50 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
51 ys >> 8, ys & 0xff, ye >> 8, ye & 0xff);
52
53 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
54 }
55
56 #define HFLIP 0x01
57 #define VFLIP 0x02
58 #define ROW_X_COL 0x20
set_var(struct fbtft_par * par)59 static int set_var(struct fbtft_par *par)
60 {
61 switch (par->info->var.rotate) {
62 case 270:
63 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
64 ROW_X_COL | HFLIP | VFLIP | (par->bgr << 3));
65 break;
66 case 180:
67 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
68 VFLIP | (par->bgr << 3));
69 break;
70 case 90:
71 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
72 ROW_X_COL | (par->bgr << 3));
73 break;
74 default:
75 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
76 HFLIP | (par->bgr << 3));
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,ili9481", &display);
95
96 MODULE_ALIAS("spi:" DRVNAME);
97 MODULE_ALIAS("platform:" DRVNAME);
98 MODULE_ALIAS("spi:ili9481");
99 MODULE_ALIAS("platform:ili9481");
100
101 MODULE_DESCRIPTION("FB driver for the ILI9481 LCD Controller");
102 MODULE_AUTHOR("Petr Olivka");
103 MODULE_LICENSE("GPL");
104