diff options
Diffstat (limited to 'src/drivers/i2c/pca9538/pca9538.h')
| -rw-r--r-- | src/drivers/i2c/pca9538/pca9538.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/drivers/i2c/pca9538/pca9538.h b/src/drivers/i2c/pca9538/pca9538.h new file mode 100644 index 0000000000..6db95be646 --- /dev/null +++ b/src/drivers/i2c/pca9538/pca9538.h @@ -0,0 +1,38 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2018 Siemens AG + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _I2C_PCA9538_H_ +#define _I2C_PCA9538_H_ + +#include <types.h> +#include <device/device.h> + +/* Register layout */ +#define INPUT_REG 0x00 +#define OUTPUT_REG 0x01 +#define INPUT_INVERT_REG 0x02 +#define IO_CONFIG_REG 0x03 + +/* Provide some functions to read input and write output values. */ +uint8_t pca9538_read_input(void); +void pca9538_set_output(uint8_t val); +/* + * Provide a way to get the right device structure for the I/O expander. + * The user of this driver has to provide this function if read/write of I/O + * values on the I/O expander is needed. + */ +struct device *pca9538_get_dev(void); + +#endif /* _I2C_PCA9538_H_ */ |