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