1/*
2 * I2C - bitbanged generic gpio implementation
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 * This is like an abstract class for gpio, a real implementation provides
25 * functions for the ops that use the underlying OS gpio arrangements.
26 */
27
28typedef struct lws_bb_i2c {
29 lws_i2c_ops_t bb_ops; /* init to lws_bb_i2c_ops */
30
31 /* implementation-specific members */
32
33 _lws_plat_gpio_t scl;
34 _lws_plat_gpio_t sda;
35
36 const lws_gpio_ops_t *gpio;
37 void (*delay)(void);
38} lws_bb_i2c_t;
39
40#define lws_bb_i2c_ops \
41 { \
42 .init = lws_bb_i2c_init, \
43 .start = lws_bb_i2c_start, \
44 .stop = lws_bb_i2c_stop, \
45 .write = lws_bb_i2c_write, \
46 .read = lws_bb_i2c_read, \
47 .set_ack = lws_bb_i2c_set_ack, \
48 }
49
50int
51lws_bb_i2c_init(const lws_i2c_ops_t *octx);
52
53int
54lws_bb_i2c_start(const lws_i2c_ops_t *octx);
55
56void
57lws_bb_i2c_stop(const lws_i2c_ops_t *octx);
58
59int
60lws_bb_i2c_write(const lws_i2c_ops_t *octx, uint8_t data);
61
62int
63lws_bb_i2c_read(const lws_i2c_ops_t *octx);
64
65void
66lws_bb_i2c_set_ack(const lws_i2c_ops_t *octx, int ack);
67