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e5b17f9047
These provide 8-bit accesses to registers within an I2C device. BUG=chrome-os-partner:7839 TEST=none Testing will come when I start using them. Change-Id: Ib53d3347253bccee93cb9c5da12db92970155d92 Signed-off-by: Bill Richardson <wfrichar@chromium.org>
40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/* Copyright (c) 2011 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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/* I2C interface for Chrome EC */
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#ifndef __CROS_EC_I2C_H
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#define __CROS_EC_I2C_H
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#include "common.h"
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/* Flags for slave address field, in addition to the 8-bit address */
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#define I2C_FLAG_BIG_ENDIAN 0x100 /* 16 byte values are MSB-first */
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/* Initializes the module. */
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int i2c_init(void);
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/* Reads a 16-bit register from the slave at 8-bit slave address
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* <slaveaddr>, at the specified 8-bit <offset> in the slave's address
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* space. */
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int i2c_read16(int port, int slave_addr, int offset, int* data);
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/* Writes a 16-bit register to the slave at 8-bit slave address
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* <slaveaddr>, at the specified 8-bit <offset> in the slave's address
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* space. */
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int i2c_write16(int port, int slave_addr, int offset, int data);
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/* Reads an 8-bit register from the slave at 8-bit slave address
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* <slaveaddr>, at the specified 8-bit <offset> in the slave's address
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* space. */
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int i2c_read8(int port, int slave_addr, int offset, int* data);
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/* Writes an 8-bit register to the slave at 8-bit slave address
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* <slaveaddr>, at the specified 8-bit <offset> in the slave's address
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* space. */
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int i2c_write8(int port, int slave_addr, int offset, int data);
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#endif /* __CROS_EC_I2C_H */
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