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Diffstat (limited to 'src/include/device/i2c_bus.h')
| -rw-r--r-- | src/include/device/i2c_bus.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/include/device/i2c_bus.h b/src/include/device/i2c_bus.h new file mode 100644 index 0000000000..474d9e5b2c --- /dev/null +++ b/src/include/device/i2c_bus.h @@ -0,0 +1,44 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Google, Inc. + * + * 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 _DEVICE_I2C_BUS_H_ +#define _DEVICE_I2C_BUS_H_ + +#include <stdint.h> +#include <device/i2c.h> +#include <device/device.h> + +/* I2C bus operation for ramstage drivers */ +struct i2c_bus_operations { + /* + * This is an SOC specific method that can be provided to translate the + * 'struct device' for an I2C controller into a unique I2C bus number. + * Returns -1 if the bus number for this device cannot be determined. + */ + int (*dev_to_bus)(struct device *dev); +}; + +/* Return I2C bus number for provided device, -1 if not found */ +int i2c_dev_find_bus(struct device *dev); + +/* Variants of I2C helper functions that take a device instead of bus number */ +int i2c_dev_transfer(struct device *dev, struct i2c_msg *segments, int count); +int i2c_dev_readb(struct device *dev, uint8_t reg, uint8_t *data); +int i2c_dev_writeb(struct device *dev, uint8_t reg, uint8_t data); +int i2c_dev_read_bytes(struct device *dev, uint8_t reg, uint8_t *data, int len); +int i2c_dev_read_raw(struct device *dev, uint8_t *data, int len); +int i2c_dev_write_raw(struct device *dev, uint8_t *data, int len); + +#endif /* _DEVICE_I2C_BUS_H_ */ |