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/* 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
*/
#ifndef __CROS_EC_IOEXPANDER_PCA9534_H
#define __CROS_EC_IOEXPANDER_PCA9534_H
#define PCA9534_REG_INPUT 0x0
#define PCA9534_REG_OUTPUT 0x1
#define PCA9534_REG_CONFIG 0x3
#define PCA9534_OUTPUT 0
#define PCA9534_INPUT 1
/*
* Get input level. Note that this reflects the actual level on the
* pin, even if the pin is configured as output.
*
* @param port The I2C port of PCA9534.
* @param addr The address of PCA9534.
* @param pin The index of the pin to read.
* @param level The pointer to where the read level is stored.
*
* @return EC_SUCCESS, or EC_ERROR_* on error.
*/
int pca9534_get_level(const int port, const uint16_t addr_flags,
int pin, int *level);
/*
* Set output level. This function has no effect if the pin is
* configured as input.
*
* @param port The I2C port of PCA9534.
* @param addr The address of PCA9534.
* @param pin The index of the pin to set.
* @param level The level to set.
*
* @return EC_SUCCESS, or EC_ERROR_* on error.
*/
int pca9534_set_level(const int port, const uint16_t addr_flags,
int pin, int level);
/*
* Config a pin as input or output.
*
* @param port The I2C port of PCA9534.
* @param addr The address of PCA9534.
* @param pin The index of the pin to set.
* @param is_input PCA9534_INPUT or PCA9534_OUTPUT.
*
* @return EC_SUCCESS, or EC_ERROR_* on error.
*/
int pca9534_config_pin(const int port, const uint16_t addr_flags,
int pin, int is_input);
#endif /* __CROS_EC_IOEXPANDER_PCA9534_H */
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