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
45
46
47
48
49
50
51
52
|
/* Copyright 2014 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.
*
* NXP PCA9534 I/O expander
*/
#include "i2c.h"
#include "pca9534.h"
static int pca9534_pin_read(const int port, const uint16_t addr_flags,
int reg, int pin, int *val)
{
int ret;
ret = i2c_read8(port, addr_flags, reg, val);
*val = (*val & BIT(pin)) ? 1 : 0;
return ret;
}
static int pca9534_pin_write(const int port, const uint16_t addr_flags,
int reg, int pin, int val)
{
int ret, v;
ret = i2c_read8(port, addr_flags, reg, &v);
if (ret != EC_SUCCESS)
return ret;
v &= ~BIT(pin);
if (val)
v |= 1 << pin;
return i2c_write8(port, addr_flags, reg, v);
}
int pca9534_get_level(const int port, const uint16_t addr_flags,
int pin, int *level)
{
return pca9534_pin_read(port, addr_flags,
PCA9534_REG_INPUT, pin, level);
}
int pca9534_set_level(const int port, const uint16_t addr_flags,
int pin, int level)
{
return pca9534_pin_write(port, addr_flags,
PCA9534_REG_OUTPUT, pin, level);
}
int pca9534_config_pin(const int port, const uint16_t addr_flags,
int pin, int is_input)
{
return pca9534_pin_write(port, addr_flags,
PCA9534_REG_CONFIG, pin, is_input);
}
|
