mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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39149579a4
This cleans up I2C init and debug commands across boards. Signed-off-by: Randall Spangler <rspangler@chromium.org> BUG=none TEST=on link and bds: i2cscan lightbar run powerbtn (to power on system) temps (to read i2c temp sensors) battery (to read battery) charger (to read charger) Change-Id: If3fb0cdb8d3178592bf68cbb2e72bc4b7f71dec5
52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/* Copyright (c) 2012 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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