60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
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/* Copyright 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* NXP PCA9534 I/O expander
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*/
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#ifndef __CROS_EC_IOEXPANDER_PCA9534_H
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#define __CROS_EC_IOEXPANDER_PCA9534_H
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#define PCA9534_REG_INPUT 0x0
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#define PCA9534_REG_OUTPUT 0x1
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#define PCA9534_REG_CONFIG 0x3
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#define PCA9534_OUTPUT 0
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#define PCA9534_INPUT 1
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/*
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* Get input level. Note that this reflects the actual level on the
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* pin, even if the pin is configured as output.
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*
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* @param port The I2C port of PCA9534.
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* @param addr The address of PCA9534.
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* @param pin The index of the pin to read.
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* @param level The pointer to where the read level is stored.
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*
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* @return EC_SUCCESS, or EC_ERROR_* on error.
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*/
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int pca9534_get_level(const int port, const uint16_t addr_flags,
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int pin, int *level);
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/*
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* Set output level. This function has no effect if the pin is
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* configured as input.
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*
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* @param port The I2C port of PCA9534.
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* @param addr The address of PCA9534.
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* @param pin The index of the pin to set.
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* @param level The level to set.
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*
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* @return EC_SUCCESS, or EC_ERROR_* on error.
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*/
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int pca9534_set_level(const int port, const uint16_t addr_flags,
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int pin, int level);
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/*
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* Config a pin as input or output.
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*
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* @param port The I2C port of PCA9534.
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* @param addr The address of PCA9534.
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* @param pin The index of the pin to set.
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* @param is_input PCA9534_INPUT or PCA9534_OUTPUT.
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*
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* @return EC_SUCCESS, or EC_ERROR_* on error.
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*/
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int pca9534_config_pin(const int port, const uint16_t addr_flags,
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int pin, int is_input);
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#endif /* __CROS_EC_IOEXPANDER_PCA9534_H */
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