xref: /aosp_15_r20/external/libwebsockets/lib/drivers/i2c/lws-i2c.c (revision 1c60b9aca93fdbc9b5f19b2d2194c91294b22281)
1*1c60b9acSAndroid Build Coastguard Worker /*
2*1c60b9acSAndroid Build Coastguard Worker  * Generic I2C
3*1c60b9acSAndroid Build Coastguard Worker  *
4*1c60b9acSAndroid Build Coastguard Worker  * Copyright (C) 2019 - 2020 Andy Green <[email protected]>
5*1c60b9acSAndroid Build Coastguard Worker  *
6*1c60b9acSAndroid Build Coastguard Worker  * Permission is hereby granted, free of charge, to any person obtaining a copy
7*1c60b9acSAndroid Build Coastguard Worker  * of this software and associated documentation files (the "Software"), to
8*1c60b9acSAndroid Build Coastguard Worker  * deal in the Software without restriction, including without limitation the
9*1c60b9acSAndroid Build Coastguard Worker  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10*1c60b9acSAndroid Build Coastguard Worker  * sell copies of the Software, and to permit persons to whom the Software is
11*1c60b9acSAndroid Build Coastguard Worker  * furnished to do so, subject to the following conditions:
12*1c60b9acSAndroid Build Coastguard Worker  *
13*1c60b9acSAndroid Build Coastguard Worker  * The above copyright notice and this permission notice shall be included in
14*1c60b9acSAndroid Build Coastguard Worker  * all copies or substantial portions of the Software.
15*1c60b9acSAndroid Build Coastguard Worker  *
16*1c60b9acSAndroid Build Coastguard Worker  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17*1c60b9acSAndroid Build Coastguard Worker  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18*1c60b9acSAndroid Build Coastguard Worker  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19*1c60b9acSAndroid Build Coastguard Worker  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20*1c60b9acSAndroid Build Coastguard Worker  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21*1c60b9acSAndroid Build Coastguard Worker  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22*1c60b9acSAndroid Build Coastguard Worker  * IN THE SOFTWARE.
23*1c60b9acSAndroid Build Coastguard Worker  *
24*1c60b9acSAndroid Build Coastguard Worker  * These are generic helpers made up of calls to the i2c driver ops, so they
25*1c60b9acSAndroid Build Coastguard Worker  * just need implementing once like this and are usable for any i2c underlying
26*1c60b9acSAndroid Build Coastguard Worker  * implementation via the ops.
27*1c60b9acSAndroid Build Coastguard Worker  */
28*1c60b9acSAndroid Build Coastguard Worker 
29*1c60b9acSAndroid Build Coastguard Worker #include <libwebsockets.h>
30*1c60b9acSAndroid Build Coastguard Worker 
31*1c60b9acSAndroid Build Coastguard Worker int
lws_i2c_command(const lws_i2c_ops_t * ctx,uint8_t ads7,uint8_t c)32*1c60b9acSAndroid Build Coastguard Worker lws_i2c_command(const lws_i2c_ops_t *ctx, uint8_t ads7, uint8_t c)
33*1c60b9acSAndroid Build Coastguard Worker {
34*1c60b9acSAndroid Build Coastguard Worker 	if (ctx->start(ctx))
35*1c60b9acSAndroid Build Coastguard Worker 		return 1;
36*1c60b9acSAndroid Build Coastguard Worker 
37*1c60b9acSAndroid Build Coastguard Worker 	if (ctx->write(ctx, ads7 << 1)) {
38*1c60b9acSAndroid Build Coastguard Worker 		ctx->stop(ctx);
39*1c60b9acSAndroid Build Coastguard Worker 
40*1c60b9acSAndroid Build Coastguard Worker 		return 1;
41*1c60b9acSAndroid Build Coastguard Worker 	}
42*1c60b9acSAndroid Build Coastguard Worker 
43*1c60b9acSAndroid Build Coastguard Worker 	ctx->write(ctx, 0);
44*1c60b9acSAndroid Build Coastguard Worker 	ctx->write(ctx, c);
45*1c60b9acSAndroid Build Coastguard Worker 	ctx->stop(ctx);
46*1c60b9acSAndroid Build Coastguard Worker 
47*1c60b9acSAndroid Build Coastguard Worker 	return 0;
48*1c60b9acSAndroid Build Coastguard Worker }
49*1c60b9acSAndroid Build Coastguard Worker 
50*1c60b9acSAndroid Build Coastguard Worker int
lws_i2c_command_list(const lws_i2c_ops_t * ctx,uint8_t ads7,const uint8_t * buf,size_t len)51*1c60b9acSAndroid Build Coastguard Worker lws_i2c_command_list(const lws_i2c_ops_t *ctx, uint8_t ads7, const uint8_t *buf,
52*1c60b9acSAndroid Build Coastguard Worker 		     size_t len)
53*1c60b9acSAndroid Build Coastguard Worker {
54*1c60b9acSAndroid Build Coastguard Worker 	while (len--)
55*1c60b9acSAndroid Build Coastguard Worker 		if (lws_i2c_command(ctx, ads7, *buf++))
56*1c60b9acSAndroid Build Coastguard Worker 			return 1;
57*1c60b9acSAndroid Build Coastguard Worker 
58*1c60b9acSAndroid Build Coastguard Worker 	return 0;
59*1c60b9acSAndroid Build Coastguard Worker }
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