1/*
2 * lws abstract display implementation for ssd1306 on i2c
3 *
4 * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25#include <private-lib-core.h>
26#include <drivers/devices/display/ssd1306.h>
27
28
29static uint8_t ssd1306_128x64_init[] = {
30	SSD1306_DISPLAYOFF,
31	SSD1306_SETDISPLAYCLOCKDIV,		0xf0,
32	SSD1306_SETMULTIPLEX,			64 - 1,
33	SSD1306_SETDISPLAYOFFSET,		0,
34	SSD1306_CHARGEPUMP,			0x14,
35	SSD1306_MEMORYMODE,			0,
36	SSD1306_SEGREMAP | (0 << 0),
37	SSD1306_COMSCANDEC,
38	SSD1306_SETCOMPINS,			(1 << 4) | 0x02,
39	SSD1306_SETCONTRAST,			0, /* start at lowest */
40	SSD1306_SETPRECHARGE,			(0xf << 4) | (1 << 0),
41	SSD1306_SETVCOMDESELECT,		(4 << 4),
42	SSD1306_DEACTIVATE_SCROLL,
43	SSD1306_DISPLAYALLON_RESUME,
44	SSD1306_NORMALDISPLAY,
45	SSD1306_DISPLAYON
46};
47
48int
49lws_display_ssd1306_i2c_init(const struct lws_display *disp)
50{
51	const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
52
53	si->i2c->init(si->i2c);
54
55	if (si->gpio) {
56		si->gpio->mode(si->reset_gpio, LWSGGPIO_FL_WRITE |
57					       LWSGGPIO_FL_PULLUP);
58		si->gpio->set(si->reset_gpio, 0);
59		lws_msleep(1);
60		si->gpio->set(si->reset_gpio, 1);
61		lws_msleep(1);
62	}
63
64	if (lws_i2c_command_list(si->i2c, si->i2c7_address,
65				 ssd1306_128x64_init,
66				 LWS_ARRAY_SIZE(ssd1306_128x64_init))) {
67		lwsl_err("%s: fail\n", __func__);
68		return 1;
69	}
70
71	return 0;
72}
73
74int
75lws_display_ssd1306_i2c_contrast(const struct lws_display *disp, uint8_t b)
76{
77	const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
78	uint8_t ba[2];
79
80	ba[0] = SSD1306_SETCONTRAST;
81	ba[1] = b;
82
83	return lws_i2c_command_list(si->i2c, si->i2c7_address,
84				    ba, LWS_ARRAY_SIZE(ba));
85}
86
87int
88lws_display_ssd1306_i2c_blit(const struct lws_display *disp, const uint8_t *src,
89			     lws_display_scalar x, lws_display_scalar y,
90			     lws_display_scalar w, lws_display_scalar h)
91{
92	const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
93	uint8_t ba[6];
94	int n, m;
95
96	/*
97	 * The display is arranged in 128x8 bands, with one byte containing
98	 * the 8 vertical pixels of the band.
99	 */
100
101	if (h < 8)
102		h = 8;
103
104	ba[0] = SSD1306_COLUMNADDR;
105	ba[1] = x;
106	ba[2] = x + w - 1;
107	ba[3] = SSD1306_PAGEADDR;
108	ba[4] = y / 8;
109	ba[5] = ba[4] + (h / 8) - 1;
110
111	if (lws_i2c_command_list(si->i2c, si->i2c7_address,
112				 ba, LWS_ARRAY_SIZE(ba))) {
113		lwsl_err("%s: fail\n", __func__);
114		return 1;
115	}
116
117        for (n = 0; n < (w * h) / 8;) {
118                lws_bb_i2c_start(si->i2c);
119                lws_bb_i2c_write(si->i2c, si->i2c7_address << 1);
120                lws_bb_i2c_write(si->i2c, SSD1306_SETSTARTLINE | y);
121
122                for (m = 0; m < w; m++)
123                        lws_bb_i2c_write(si->i2c, src[n++]);
124
125                lws_bb_i2c_stop(si->i2c);
126                y += 8;
127        }
128
129	return 0;
130}
131
132int
133lws_display_ssd1306_i2c_power(const struct lws_display *disp, int state)
134{
135	const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
136
137	if (!state)
138		return lws_i2c_command(si->i2c, si->i2c7_address,
139				       SSD1306_DISPLAYOFF | !!state);
140
141	return lws_display_ssd1306_i2c_init(disp);
142}
143