| /* Copyright (c) 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(int port, int addr, 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(int port, int addr, 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(int port, int addr, int pin, int is_input); |
| |
| #endif /* __CROS_EC_IOEXPANDER_PCA9534_H */ |