1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Custom FB driver for tinylcd.com display
4 *
5 * Copyright (C) 2013 Noralf Tronnes
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/delay.h>
12#include <video/mipi_display.h>
13
14#include "fbtft.h"
15
16#define DRVNAME		"fb_tinylcd"
17#define WIDTH		320
18#define HEIGHT		480
19
20static int init_display(struct fbtft_par *par)
21{
22	par->fbtftops.reset(par);
23
24	write_reg(par, 0xB0, 0x80);
25	write_reg(par, 0xC0, 0x0A, 0x0A);
26	write_reg(par, 0xC1, 0x45, 0x07);
27	write_reg(par, 0xC2, 0x33);
28	write_reg(par, 0xC5, 0x00, 0x42, 0x80);
29	write_reg(par, 0xB1, 0xD0, 0x11);
30	write_reg(par, 0xB4, 0x02);
31	write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
32	write_reg(par, 0xB7, 0x07);
33	write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
34	write_reg(par, 0xF0, 0x36, 0xA5, 0xD3);
35	write_reg(par, 0xE5, 0x80);
36	write_reg(par, 0xE5, 0x01);
37	write_reg(par, 0xB3, 0x00);
38	write_reg(par, 0xE5, 0x00);
39	write_reg(par, 0xF0, 0x36, 0xA5, 0x53);
40	write_reg(par, 0xE0, 0x00, 0x35, 0x33, 0x00, 0x00, 0x00,
41		       0x00, 0x35, 0x33, 0x00, 0x00, 0x00);
42	write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
43	write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
44	udelay(250);
45	write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
46
47	return 0;
48}
49
50static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
51{
52	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
53		  xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
54
55	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
56		  ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
57
58	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
59}
60
61static int set_var(struct fbtft_par *par)
62{
63	switch (par->info->var.rotate) {
64	case 270:
65		write_reg(par, 0xB6, 0x00, 0x02, 0x3B);
66		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x28);
67		break;
68	case 180:
69		write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
70		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
71		break;
72	case 90:
73		write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
74		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x38);
75		break;
76	default:
77		write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
78		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x08);
79		break;
80	}
81
82	return 0;
83}
84
85static struct fbtft_display display = {
86	.regwidth = 8,
87	.width = WIDTH,
88	.height = HEIGHT,
89	.fbtftops = {
90		.init_display = init_display,
91		.set_addr_win = set_addr_win,
92		.set_var = set_var,
93	},
94};
95
96FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display);
97
98MODULE_ALIAS("spi:" DRVNAME);
99MODULE_ALIAS("spi:tinylcd");
100
101MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display");
102MODULE_AUTHOR("Noralf Tronnes");
103MODULE_LICENSE("GPL");
104