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
21static 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
45static 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
59static 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
83static 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
94FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9481", &display);
95
96MODULE_ALIAS("spi:" DRVNAME);
97MODULE_ALIAS("platform:" DRVNAME);
98MODULE_ALIAS("spi:ili9481");
99MODULE_ALIAS("platform:ili9481");
100
101MODULE_DESCRIPTION("FB driver for the ILI9481 LCD Controller");
102MODULE_AUTHOR("Petr Olivka");
103MODULE_LICENSE("GPL");
104