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/* Copyright 2014 The ChromiumOS Authors
* 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);
}
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