1 /*
2 * Generic I2C
3 *
4 * Copyright (C) 2019 - 2020 Andy Green <[email protected]>
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 * These are generic helpers made up of calls to the i2c driver ops, so they
25 * just need implementing once like this and are usable for any i2c underlying
26 * implementation via the ops.
27 */
28
29 #include <libwebsockets.h>
30
31 int
lws_i2c_command(const lws_i2c_ops_t * ctx,uint8_t ads7,uint8_t c)32 lws_i2c_command(const lws_i2c_ops_t *ctx, uint8_t ads7, uint8_t c)
33 {
34 if (ctx->start(ctx))
35 return 1;
36
37 if (ctx->write(ctx, ads7 << 1)) {
38 ctx->stop(ctx);
39
40 return 1;
41 }
42
43 ctx->write(ctx, 0);
44 ctx->write(ctx, c);
45 ctx->stop(ctx);
46
47 return 0;
48 }
49
50 int
lws_i2c_command_list(const lws_i2c_ops_t * ctx,uint8_t ads7,const uint8_t * buf,size_t len)51 lws_i2c_command_list(const lws_i2c_ops_t *ctx, uint8_t ads7, const uint8_t *buf,
52 size_t len)
53 {
54 while (len--)
55 if (lws_i2c_command(ctx, ads7, *buf++))
56 return 1;
57
58 return 0;
59 }
60