45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _DEVICE_I2C_BUS_H_
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#define _DEVICE_I2C_BUS_H_
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#include <stdint.h>
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#include <device/i2c.h>
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#include <device/device.h>
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/* I2C bus operation for ramstage drivers */
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struct i2c_bus_operations {
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/*
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* This is an SOC specific method that can be provided to translate the
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* 'struct device' for an I2C controller into a unique I2C bus number.
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* Returns -1 if the bus number for this device cannot be determined.
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*/
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int (*dev_to_bus)(struct device *dev);
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};
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/* Return I2C bus number for provided device, -1 if not found */
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int i2c_dev_find_bus(struct device *dev);
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/* Variants of I2C helper functions that take a device instead of bus number */
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int i2c_dev_transfer(struct device *dev, struct i2c_msg *segments, int count);
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int i2c_dev_readb(struct device *dev, uint8_t reg, uint8_t *data);
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int i2c_dev_writeb(struct device *dev, uint8_t reg, uint8_t data);
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int i2c_dev_read_bytes(struct device *dev, uint8_t reg, uint8_t *data, int len);
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int i2c_dev_read_raw(struct device *dev, uint8_t *data, int len);
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int i2c_dev_write_raw(struct device *dev, uint8_t *data, int len);
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#endif /* _DEVICE_I2C_BUS_H_ */
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