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34e17d4c05
It's only board-specific in that we've only needed it on snow so far. But by that logic, x86_power would be board specific because we've only needed it on link. No functionality change, just moving code between files and renaming the interface to indicate it's not board-specific. BUG=chrome-os-partner:18343 BRANCH=none TEST=build daisy,snow,spring Change-Id: I35debdaa71829d55a2fbc5d3c62b2aaf6e467633 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/45879
52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/* Copyright (c) 2013 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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/* Data structure to define I2C port configuration. */
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struct i2c_port_t {
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const char *name; /* Port name */
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int port; /* Port */
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int kbps; /* Speed in kbps */
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};
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/* Read a 16-bit register from the slave at 8-bit slave address <slaveaddr>, at
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* the specified 8-bit <offset> in the slave's address space. */
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int i2c_read16(int port, int slave_addr, int offset, int* data);
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/* Write a 16-bit register to the slave at 8-bit slave address <slaveaddr>, at
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* the specified 8-bit <offset> in the slave's address space. */
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int i2c_write16(int port, int slave_addr, int offset, int data);
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/* Read an 8-bit register from the slave at 8-bit slave address <slaveaddr>, at
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* the specified 8-bit <offset> in the slave's address space. */
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int i2c_read8(int port, int slave_addr, int offset, int* data);
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/* Write an 8-bit register to the slave at 8-bit slave address <slaveaddr>, at
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* the specified 8-bit <offset> in the slave's address space. */
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int i2c_write8(int port, int slave_addr, int offset, int data);
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/* Read ascii string using smbus read block protocol.
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* Read bytestream from <slaveaddr>:<offset> with format:
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* [length_N] [byte_0] [byte_1] ... [byte_N-1]
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*
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* <len> : the max length of receving buffer. to read N bytes
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* ascii, len should be at least N+1 to include the
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* terminating 0.
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* <len> == 0 : buffer size > 255
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*/
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int i2c_read_string(int port, int slave_addr, int offset, uint8_t *data,
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int len);
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#endif /* __CROS_EC_I2C_H */
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