1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * FB driver for the NHD-1.69-160128UGC3 (Newhaven Display International, Inc.)
4 * using the SEPS525 (Syncoam) LCD Controller
5 *
6 * Copyright (C) 2016 Analog Devices Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/gpio.h>
23 #include <linux/delay.h>
24
25 #include "fbtft.h"
26
27 #define DRVNAME "fb_seps525"
28 #define WIDTH 160
29 #define HEIGHT 128
30
31 #define SEPS525_INDEX 0x00
32 #define SEPS525_STATUS_RD 0x01
33 #define SEPS525_OSC_CTL 0x02
34 #define SEPS525_IREF 0x80
35 #define SEPS525_CLOCK_DIV 0x03
36 #define SEPS525_REDUCE_CURRENT 0x04
37 #define SEPS525_SOFT_RST 0x05
38 #define SEPS525_DISP_ONOFF 0x06
39 #define SEPS525_PRECHARGE_TIME_R 0x08
40 #define SEPS525_PRECHARGE_TIME_G 0x09
41 #define SEPS525_PRECHARGE_TIME_B 0x0A
42 #define SEPS525_PRECHARGE_CURRENT_R 0x0B
43 #define SEPS525_PRECHARGE_CURRENT_G 0x0C
44 #define SEPS525_PRECHARGE_CURRENT_B 0x0D
45 #define SEPS525_DRIVING_CURRENT_R 0x10
46 #define SEPS525_DRIVING_CURRENT_G 0x11
47 #define SEPS525_DRIVING_CURRENT_B 0x12
48 #define SEPS525_DISPLAYMODE_SET 0x13
49 #define SEPS525_RGBIF 0x14
50 #define SEPS525_RGB_POL 0x15
51 #define SEPS525_MEMORY_WRITEMODE 0x16
52 #define SEPS525_MX1_ADDR 0x17
53 #define SEPS525_MX2_ADDR 0x18
54 #define SEPS525_MY1_ADDR 0x19
55 #define SEPS525_MY2_ADDR 0x1A
56 #define SEPS525_MEMORY_ACCESS_POINTER_X 0x20
57 #define SEPS525_MEMORY_ACCESS_POINTER_Y 0x21
58 #define SEPS525_DDRAM_DATA_ACCESS_PORT 0x22
59 #define SEPS525_GRAY_SCALE_TABLE_INDEX 0x50
60 #define SEPS525_GRAY_SCALE_TABLE_DATA 0x51
61 #define SEPS525_DUTY 0x28
62 #define SEPS525_DSL 0x29
63 #define SEPS525_D1_DDRAM_FAC 0x2E
64 #define SEPS525_D1_DDRAM_FAR 0x2F
65 #define SEPS525_D2_DDRAM_SAC 0x31
66 #define SEPS525_D2_DDRAM_SAR 0x32
67 #define SEPS525_SCR1_FX1 0x33
68 #define SEPS525_SCR1_FX2 0x34
69 #define SEPS525_SCR1_FY1 0x35
70 #define SEPS525_SCR1_FY2 0x36
71 #define SEPS525_SCR2_SX1 0x37
72 #define SEPS525_SCR2_SX2 0x38
73 #define SEPS525_SCR2_SY1 0x39
74 #define SEPS525_SCR2_SY2 0x3A
75 #define SEPS525_SCREEN_SAVER_CONTEROL 0x3B
76 #define SEPS525_SS_SLEEP_TIMER 0x3C
77 #define SEPS525_SCREEN_SAVER_MODE 0x3D
78 #define SEPS525_SS_SCR1_FU 0x3E
79 #define SEPS525_SS_SCR1_MXY 0x3F
80 #define SEPS525_SS_SCR2_FU 0x40
81 #define SEPS525_SS_SCR2_MXY 0x41
82 #define SEPS525_MOVING_DIRECTION 0x42
83 #define SEPS525_SS_SCR2_SX1 0x47
84 #define SEPS525_SS_SCR2_SX2 0x48
85 #define SEPS525_SS_SCR2_SY1 0x49
86 #define SEPS525_SS_SCR2_SY2 0x4A
87
88 /* SEPS525_DISPLAYMODE_SET */
89 #define MODE_SWAP_BGR BIT(7)
90 #define MODE_SM BIT(6)
91 #define MODE_RD BIT(5)
92 #define MODE_CD BIT(4)
93
94 #define seps525_use_window 0 /* FBTFT doesn't really use it today */
95
96 /* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */
init_display(struct fbtft_par * par)97 static int init_display(struct fbtft_par *par)
98 {
99 par->fbtftops.reset(par);
100
101 usleep_range(1000, 5000);
102
103 /* Disable Oscillator Power Down */
104 write_reg(par, SEPS525_REDUCE_CURRENT, 0x03);
105 usleep_range(1000, 5000);
106 /* Set Normal Driving Current */
107 write_reg(par, SEPS525_REDUCE_CURRENT, 0x00);
108 usleep_range(1000, 5000);
109
110 write_reg(par, SEPS525_SCREEN_SAVER_CONTEROL, 0x00);
111 /* Set EXPORT1 Pin at Internal Clock */
112 write_reg(par, SEPS525_OSC_CTL, 0x01);
113 /* Set Clock as 120 Frames/Sec */
114 write_reg(par, SEPS525_CLOCK_DIV, 0x90);
115 /* Set Reference Voltage Controlled by External Resister */
116 write_reg(par, SEPS525_IREF, 0x01);
117
118 /* precharge time R G B */
119 write_reg(par, SEPS525_PRECHARGE_TIME_R, 0x04);
120 write_reg(par, SEPS525_PRECHARGE_TIME_G, 0x05);
121 write_reg(par, SEPS525_PRECHARGE_TIME_B, 0x05);
122
123 /* precharge current R G B (uA) */
124 write_reg(par, SEPS525_PRECHARGE_CURRENT_R, 0x9D);
125 write_reg(par, SEPS525_PRECHARGE_CURRENT_G, 0x8C);
126 write_reg(par, SEPS525_PRECHARGE_CURRENT_B, 0x57);
127
128 /* driving current R G B (uA) */
129 write_reg(par, SEPS525_DRIVING_CURRENT_R, 0x56);
130 write_reg(par, SEPS525_DRIVING_CURRENT_G, 0x4D);
131 write_reg(par, SEPS525_DRIVING_CURRENT_B, 0x46);
132 /* Set Color Sequence */
133 write_reg(par, SEPS525_DISPLAYMODE_SET, 0xA0);
134 write_reg(par, SEPS525_RGBIF, 0x01); /* Set MCU Interface Mode */
135 /* Set Memory Write Mode */
136 write_reg(par, SEPS525_MEMORY_WRITEMODE, 0x66);
137 write_reg(par, SEPS525_DUTY, 0x7F); /* 1/128 Duty (0x0F~0x7F) */
138 /* Set Mapping RAM Display Start Line (0x00~0x7F) */
139 write_reg(par, SEPS525_DSL, 0x00);
140 write_reg(par, SEPS525_DISP_ONOFF, 0x01); /* Display On (0x00/0x01) */
141 /* Set All Internal Register Value as Normal Mode */
142 write_reg(par, SEPS525_SOFT_RST, 0x00);
143 /* Set RGB Interface Polarity as Active Low */
144 write_reg(par, SEPS525_RGB_POL, 0x00);
145
146 write_reg(par, SEPS525_DDRAM_DATA_ACCESS_PORT);
147
148 return 0;
149 }
150
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)151 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
152 {
153 if (seps525_use_window) {
154 /* Set Window Xs,Ys Xe,Ye*/
155 write_reg(par, SEPS525_MX1_ADDR, xs);
156 write_reg(par, SEPS525_MX2_ADDR, xe);
157 write_reg(par, SEPS525_MY1_ADDR, ys);
158 write_reg(par, SEPS525_MY2_ADDR, ye);
159 }
160 /* start position X,Y */
161 write_reg(par, SEPS525_MEMORY_ACCESS_POINTER_X, xs);
162 write_reg(par, SEPS525_MEMORY_ACCESS_POINTER_Y, ys);
163
164 write_reg(par, SEPS525_DDRAM_DATA_ACCESS_PORT);
165 }
166
set_var(struct fbtft_par * par)167 static int set_var(struct fbtft_par *par)
168 {
169 u8 val;
170
171 switch (par->info->var.rotate) {
172 case 0:
173 val = 0;
174 break;
175 case 180:
176 val = MODE_RD | MODE_CD;
177 break;
178 case 90:
179 case 270:
180
181 default:
182 return -EINVAL;
183 }
184 /* Memory Access Control */
185 write_reg(par, SEPS525_DISPLAYMODE_SET, val |
186 (par->bgr ? MODE_SWAP_BGR : 0));
187
188 write_reg(par, SEPS525_DDRAM_DATA_ACCESS_PORT);
189
190 return 0;
191 }
192
193 static struct fbtft_display display = {
194 .regwidth = 8,
195 .width = WIDTH,
196 .height = HEIGHT,
197 .fbtftops = {
198 .init_display = init_display,
199 .set_addr_win = set_addr_win,
200 .set_var = set_var,
201 },
202 };
203
204 FBTFT_REGISTER_DRIVER(DRVNAME, "syncoam,seps525", &display);
205
206 MODULE_ALIAS("spi:" DRVNAME);
207 MODULE_ALIAS("platform:" DRVNAME);
208 MODULE_ALIAS("spi:seps525");
209 MODULE_ALIAS("platform:seps525");
210
211 MODULE_DESCRIPTION("FB driver for the SEPS525 LCD Controller");
212 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
213 MODULE_LICENSE("GPL");
214