1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * FB driver for the HX8357D LCD Controller
4 * Copyright (C) 2015 Adafruit Industries
5 *
6 * Based on the HX8347D FB driver
7 * Copyright (C) 2013 Christian Vogelgsang
8 *
9 * Based on driver code found here: https://github.com/watterott/r61505u-Adapter
10 */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/delay.h>
16 #include <video/mipi_display.h>
17
18 #include "fbtft.h"
19 #include "fb_hx8357d.h"
20
21 #define DRVNAME "fb_hx8357d"
22 #define WIDTH 320
23 #define HEIGHT 480
24
init_display(struct fbtft_par * par)25 static int init_display(struct fbtft_par *par)
26 {
27 par->fbtftops.reset(par);
28
29 /* Reset things like Gamma */
30 write_reg(par, MIPI_DCS_SOFT_RESET);
31 usleep_range(5000, 7000);
32
33 /* setextc */
34 write_reg(par, HX8357D_SETC, 0xFF, 0x83, 0x57);
35 msleep(150);
36
37 /* setRGB which also enables SDO */
38 write_reg(par, HX8357_SETRGB, 0x00, 0x00, 0x06, 0x06);
39
40 /* -1.52V */
41 write_reg(par, HX8357D_SETCOM, 0x25);
42
43 /* Normal mode 70Hz, Idle mode 55 Hz */
44 write_reg(par, HX8357_SETOSC, 0x68);
45
46 /* Set Panel - BGR, Gate direction swapped */
47 write_reg(par, HX8357_SETPANEL, 0x05);
48
49 write_reg(par, HX8357_SETPWR1,
50 0x00, /* Not deep standby */
51 0x15, /* BT */
52 0x1C, /* VSPR */
53 0x1C, /* VSNR */
54 0x83, /* AP */
55 0xAA); /* FS */
56
57 write_reg(par, HX8357D_SETSTBA,
58 0x50, /* OPON normal */
59 0x50, /* OPON idle */
60 0x01, /* STBA */
61 0x3C, /* STBA */
62 0x1E, /* STBA */
63 0x08); /* GEN */
64
65 write_reg(par, HX8357D_SETCYC,
66 0x02, /* NW 0x02 */
67 0x40, /* RTN */
68 0x00, /* DIV */
69 0x2A, /* DUM */
70 0x2A, /* DUM */
71 0x0D, /* GDON */
72 0x78); /* GDOFF */
73
74 write_reg(par, HX8357D_SETGAMMA,
75 0x02,
76 0x0A,
77 0x11,
78 0x1d,
79 0x23,
80 0x35,
81 0x41,
82 0x4b,
83 0x4b,
84 0x42,
85 0x3A,
86 0x27,
87 0x1B,
88 0x08,
89 0x09,
90 0x03,
91 0x02,
92 0x0A,
93 0x11,
94 0x1d,
95 0x23,
96 0x35,
97 0x41,
98 0x4b,
99 0x4b,
100 0x42,
101 0x3A,
102 0x27,
103 0x1B,
104 0x08,
105 0x09,
106 0x03,
107 0x00,
108 0x01);
109
110 /* 16 bit */
111 write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
112
113 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0xC0);
114
115 /* TE off */
116 write_reg(par, MIPI_DCS_SET_TEAR_ON, 0x00);
117
118 /* tear line */
119 write_reg(par, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
120
121 /* Exit Sleep */
122 write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
123 msleep(150);
124
125 /* display on */
126 write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
127 usleep_range(5000, 7000);
128
129 return 0;
130 }
131
set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)132 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
133 {
134 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
135 xs >> 8, xs & 0xff, /* XSTART */
136 xe >> 8, xe & 0xff); /* XEND */
137
138 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
139 ys >> 8, ys & 0xff, /* YSTART */
140 ye >> 8, ye & 0xff); /* YEND */
141
142 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
143 }
144
145 #define HX8357D_MADCTL_MY 0x80
146 #define HX8357D_MADCTL_MX 0x40
147 #define HX8357D_MADCTL_MV 0x20
148 #define HX8357D_MADCTL_ML 0x10
149 #define HX8357D_MADCTL_RGB 0x00
150 #define HX8357D_MADCTL_BGR 0x08
151 #define HX8357D_MADCTL_MH 0x04
set_var(struct fbtft_par * par)152 static int set_var(struct fbtft_par *par)
153 {
154 u8 val;
155
156 switch (par->info->var.rotate) {
157 case 270:
158 val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
159 break;
160 case 180:
161 val = 0;
162 break;
163 case 90:
164 val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
165 break;
166 default:
167 val = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
168 break;
169 }
170
171 val |= (par->bgr ? HX8357D_MADCTL_RGB : HX8357D_MADCTL_BGR);
172
173 /* Memory Access Control */
174 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val);
175
176 return 0;
177 }
178
179 static struct fbtft_display display = {
180 .regwidth = 8,
181 .width = WIDTH,
182 .height = HEIGHT,
183 .gamma_num = 2,
184 .gamma_len = 14,
185 .fbtftops = {
186 .init_display = init_display,
187 .set_addr_win = set_addr_win,
188 .set_var = set_var,
189 },
190 };
191
192 FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8357d", &display);
193
194 MODULE_ALIAS("spi:" DRVNAME);
195 MODULE_ALIAS("platform:" DRVNAME);
196 MODULE_ALIAS("spi:hx8357d");
197 MODULE_ALIAS("platform:hx8357d");
198
199 MODULE_DESCRIPTION("FB driver for the HX8357D LCD Controller");
200 MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
201 MODULE_LICENSE("GPL");
202