1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * FB driver for the S6D02A1 LCD Controller
4  *
5  * Based on fb_st7735r.c by Noralf Tronnes
6  * Init code from UTFT library by Henning Karlsen
7  */
8 
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <video/mipi_display.h>
13 
14 #include "fbtft.h"
15 
16 #define DRVNAME "fb_s6d02a1"
17 
18 static const s16 default_init_sequence[] = {
19 	-1, 0xf0, 0x5a, 0x5a,
20 
21 	-1, 0xfc, 0x5a, 0x5a,
22 
23 	-1, 0xfa, 0x02, 0x1f, 0x00, 0x10, 0x22, 0x30, 0x38,
24 	0x3A, 0x3A, 0x3A, 0x3A, 0x3A, 0x3d, 0x02, 0x01,
25 
26 	-1, 0xfb, 0x21, 0x00, 0x02, 0x04, 0x07, 0x0a, 0x0b,
27 	0x0c, 0x0c, 0x16, 0x1e, 0x30, 0x3f, 0x01, 0x02,
28 
29 	/* power setting sequence */
30 	-1, 0xfd, 0x00, 0x00, 0x00, 0x17, 0x10, 0x00, 0x01,
31 	0x01, 0x00, 0x1f, 0x1f,
32 
33 	-1, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x3f,
34 	0x07, 0x00, 0x3C, 0x36, 0x00, 0x3C, 0x36, 0x00,
35 
36 	-1, 0xf5, 0x00, 0x70, 0x66, 0x00, 0x00, 0x00, 0x00,
37 	0x00, 0x00, 0x00, 0x6d, 0x66, 0x06,
38 
39 	-1, 0xf6, 0x02, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x02,
40 	0x00, 0x06, 0x01, 0x00,
41 
42 	-1, 0xf2, 0x00, 0x01, 0x03, 0x08, 0x08, 0x04, 0x00,
43 	0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x04, 0x08, 0x08,
44 
45 	-1, 0xf8, 0x11,
46 
47 	-1, 0xf7, 0xc8, 0x20, 0x00, 0x00,
48 
49 	-1, 0xf3, 0x00, 0x00,
50 
51 	-1, MIPI_DCS_EXIT_SLEEP_MODE,
52 	-2, 50,
53 
54 	-1, 0xf3, 0x00, 0x01,
55 	-2, 50,
56 	-1, 0xf3, 0x00, 0x03,
57 	-2, 50,
58 	-1, 0xf3, 0x00, 0x07,
59 	-2, 50,
60 	-1, 0xf3, 0x00, 0x0f,
61 	-2, 50,
62 
63 	-1, 0xf4, 0x00, 0x04, 0x00, 0x00, 0x00, 0x3f, 0x3f,
64 	0x07, 0x00, 0x3C, 0x36, 0x00, 0x3C, 0x36, 0x00,
65 	-2, 50,
66 
67 	-1, 0xf3, 0x00, 0x1f,
68 	-2, 50,
69 	-1, 0xf3, 0x00, 0x7f,
70 	-2, 50,
71 
72 	-1, 0xf3, 0x00, 0xff,
73 	-2, 50,
74 
75 	-1, 0xfd, 0x00, 0x00, 0x00, 0x17, 0x10, 0x00, 0x00,
76 	0x01, 0x00, 0x16, 0x16,
77 
78 	-1, 0xf4, 0x00, 0x09, 0x00, 0x00, 0x00, 0x3f, 0x3f,
79 	0x07, 0x00, 0x3C, 0x36, 0x00, 0x3C, 0x36, 0x00,
80 
81 	/* initializing sequence */
82 
83 	-1, MIPI_DCS_SET_ADDRESS_MODE, 0x08,
84 
85 	-1, MIPI_DCS_SET_TEAR_ON, 0x00,
86 
87 	-1, MIPI_DCS_SET_PIXEL_FORMAT, 0x05,
88 
89 	/* gamma setting - possible values 0x01, 0x02, 0x04, 0x08 */
90 	-1, MIPI_DCS_SET_GAMMA_CURVE, 0x01,
91 
92 	-2, 150,
93 	-1, MIPI_DCS_SET_DISPLAY_ON,
94 	-1, MIPI_DCS_WRITE_MEMORY_START,
95 	/* end marker */
96 	-3
97 
98 };
99 
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)100 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
101 {
102 	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
103 		  xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
104 
105 	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
106 		  ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
107 
108 	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
109 }
110 
111 #define MY BIT(7)
112 #define MX BIT(6)
113 #define MV BIT(5)
set_var(struct fbtft_par * par)114 static int set_var(struct fbtft_par *par)
115 {
116 	/*
117 	 * Memory data access control (0x36h)
118 	 * RGB/BGR:
119 	 *	1. Mode selection pin SRGB
120 	 *		RGB H/W pin for color filter setting: 0=RGB, 1=BGR
121 	 *	2. MADCTL RGB bit
122 	 *		RGB-BGR ORDER color filter panel: 0=RGB, 1=BGR
123 	 */
124 	switch (par->info->var.rotate) {
125 	case 0:
126 		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
127 			  MX | MY | (par->bgr << 3));
128 		break;
129 	case 270:
130 		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
131 			  MY | MV | (par->bgr << 3));
132 		break;
133 	case 180:
134 		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
135 			  par->bgr << 3);
136 		break;
137 	case 90:
138 		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
139 			  MX | MV | (par->bgr << 3));
140 		break;
141 	}
142 
143 	return 0;
144 }
145 
146 static struct fbtft_display display = {
147 	.regwidth = 8,
148 	.width = 128,
149 	.height = 160,
150 	.init_sequence = default_init_sequence,
151 	.fbtftops = {
152 		.set_addr_win = set_addr_win,
153 		.set_var = set_var,
154 	},
155 };
156 
157 FBTFT_REGISTER_DRIVER(DRVNAME, "samsung,s6d02a1", &display);
158 
159 MODULE_ALIAS("spi:" DRVNAME);
160 MODULE_ALIAS("platform:" DRVNAME);
161 MODULE_ALIAS("spi:s6d02a1");
162 MODULE_ALIAS("platform:s6d02a1");
163 
164 MODULE_DESCRIPTION("FB driver for the S6D02A1 LCD Controller");
165 MODULE_AUTHOR("WOLFGANG BUENING");
166 MODULE_LICENSE("GPL");
167