1#include <linux/module.h>
2#include <linux/kernel.h>
3#include <linux/init.h>
4#include <linux/gpio.h>
5#include <linux/spi/spi.h>
6#include <linux/delay.h>
7
8#include "fbtft.h"
9
10#define DRVNAME "fb_ssd1331"
11#define WIDTH 96
12#define HEIGHT 64
13#define GAMMA_NUM 1
14#define GAMMA_LEN 63
15#define DEFAULT_GAMMA "0 2 2 2 2 2 2 2 " \
16 "2 2 2 2 2 2 2 2 " \
17 "2 2 2 2 2 2 2 2 " \
18 "2 2 2 2 2 2 2 2 " \
19 "2 2 2 2 2 2 2 2 " \
20 "2 2 2 2 2 2 2 2 " \
21 "2 2 2 2 2 2 2 2 " \
22 "2 2 2 2 2 2 2" \
23
24static int init_display(struct fbtft_par *par)
25{
26 par->fbtftops.reset(par);
27
28 write_reg(par, 0xae);
29 write_reg(par, 0xa0, 0x70 | (par->bgr << 2));
30 write_reg(par, 0x72);
31 write_reg(par, 0xa1, 0x00);
32 write_reg(par, 0xa2, 0x00);
33 write_reg(par, 0xa4);
34 write_reg(par, 0xa8, 0x3f);
35 write_reg(par, 0xad, 0x8e);
36
37 write_reg(par, 0xb1, 0x31);
38 write_reg(par, 0xb3, 0xf0);
39 write_reg(par, 0x8a, 0x64);
40 write_reg(par, 0x8b, 0x78);
41 write_reg(par, 0x8c, 0x64);
42 write_reg(par, 0xbb, 0x3a);
43 write_reg(par, 0xbe, 0x3e);
44 write_reg(par, 0x87, 0x06);
45 write_reg(par, 0x81, 0x91);
46 write_reg(par, 0x82, 0x50);
47 write_reg(par, 0x83, 0x7d);
48 write_reg(par, 0xaf);
49
50 return 0;
51}
52
53static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
54{
55 write_reg(par, 0x15, xs, xe);
56 write_reg(par, 0x75, ys, ye);
57}
58
59static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
60{
61 va_list args;
62 int i, ret;
63 u8 *buf = par->buf;
64
65 if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
66 va_start(args, len);
67 for (i = 0; i < len; i++)
68 buf[i] = (u8)va_arg(args, unsigned int);
69 va_end(args);
70 fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, u8, buf, len, "%s: ", __func__);
71 }
72
73 va_start(args, len);
74
75 *buf = (u8)va_arg(args, unsigned int);
76 if (par->gpio.dc != -1)
77 gpio_set_value(par->gpio.dc, 0);
78 ret = par->fbtftops.write(par, par->buf, sizeof(u8));
79 if (ret < 0) {
80 va_end(args);
81 dev_err(par->info->device,
82 "write() failed and returned %d\n", ret);
83 return;
84 }
85 len--;
86
87 if (len) {
88 i = len;
89 while (i--)
90 *buf++ = (u8)va_arg(args, unsigned int);
91 ret = par->fbtftops.write(par, par->buf, len * (sizeof(u8)));
92 if (ret < 0) {
93 va_end(args);
94 dev_err(par->info->device,
95 "write() failed and returned %d\n", ret);
96 return;
97 }
98 }
99 if (par->gpio.dc != -1)
100 gpio_set_value(par->gpio.dc, 1);
101 va_end(args);
102}
103
104
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123
124
125static int set_gamma(struct fbtft_par *par, unsigned long *curves)
126{
127 unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
128 int i, acc = 0;
129
130 for (i = 0; i < 63; i++) {
131 if (i > 0 && curves[i] < 2) {
132 dev_err(par->info->device,
133 "Illegal value in Grayscale Lookup Table at index %d. " \
134 "Must be greater than 1\n", i);
135 return -EINVAL;
136 }
137 acc += curves[i];
138 tmp[i] = acc;
139 if (acc > 180) {
140 dev_err(par->info->device,
141 "Illegal value(s) in Grayscale Lookup Table. " \
142 "At index=%d, the accumulated value has exceeded 180\n", i);
143 return -EINVAL;
144 }
145 }
146
147 write_reg(par, 0xB8,
148 tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6], tmp[7],
149 tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13], tmp[14], tmp[15],
150 tmp[16], tmp[17], tmp[18], tmp[19], tmp[20], tmp[21], tmp[22], tmp[23],
151 tmp[24], tmp[25], tmp[26], tmp[27], tmp[28], tmp[29], tmp[30], tmp[31],
152 tmp[32], tmp[33], tmp[34], tmp[35], tmp[36], tmp[37], tmp[38], tmp[39],
153 tmp[40], tmp[41], tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47],
154 tmp[48], tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55],
155 tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61], tmp[62]);
156
157 return 0;
158}
159
160static int blank(struct fbtft_par *par, bool on)
161{
162 fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n",
163 __func__, on ? "true" : "false");
164 if (on)
165 write_reg(par, 0xAE);
166 else
167 write_reg(par, 0xAF);
168 return 0;
169}
170
171static struct fbtft_display display = {
172 .regwidth = 8,
173 .width = WIDTH,
174 .height = HEIGHT,
175 .gamma_num = GAMMA_NUM,
176 .gamma_len = GAMMA_LEN,
177 .gamma = DEFAULT_GAMMA,
178 .fbtftops = {
179 .write_register = write_reg8_bus8,
180 .init_display = init_display,
181 .set_addr_win = set_addr_win,
182 .set_gamma = set_gamma,
183 .blank = blank,
184 },
185};
186
187FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1331", &display);
188
189MODULE_ALIAS("spi:" DRVNAME);
190MODULE_ALIAS("platform:" DRVNAME);
191MODULE_ALIAS("spi:ssd1331");
192MODULE_ALIAS("platform:ssd1331");
193
194MODULE_DESCRIPTION("SSD1331 OLED Driver");
195MODULE_AUTHOR("Alec Smecher (adapted from SSD1351 by James Davies)");
196MODULE_LICENSE("GPL");
197