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
init_display(struct fbtft_par * par)20 static 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
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)50 static 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
set_var(struct fbtft_par * par)61 static 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
85 static 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
96 FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display);
97
98 MODULE_ALIAS("spi:" DRVNAME);
99 MODULE_ALIAS("spi:tinylcd");
100
101 MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display");
102 MODULE_AUTHOR("Noralf Tronnes");
103 MODULE_LICENSE("GPL");
104