blob: cf4d39d247ac97e2080eb0be0e69e8100340cad2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* I2C arbitration for Chrome EC */
#ifndef __CROS_EC_I2C_ARBITRATION_H
#define __CROS_EC_I2C_ARBITRATION_H
#include "common.h"
#ifdef CONFIG_I2C_ARBITRATION
/**
* Claim an I2C port for use in master mode.
*
* If this function succeeds, you must later call i2c_release() to release the
* claim.
*
* This function must not be called to claim an already-claimed port.
*
* @param port Port to claim (0 for first, 1 for second, etc.)
* @return 0 if claimed successfully, -1 if it is in use
*/
int i2c_claim(int port);
/**
* Release an I2C port (after previously being claimed)
*
* This function must not be called to release an already-released port.
*
* @param port Port to claim (0 for first, 1 for second, etc.)
*/
void i2c_release(int port);
#else
static inline int i2c_claim(int port) { return EC_SUCCESS; }
static inline void i2c_release(int port) {}
#endif
#endif /* __CROS_EC_I2C_ARBITRATION_H */
|
