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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* 1-wire interface for Chrome EC */
/* Note that 1-wire communication is VERY latency-sensitive. If these
* functions are run at low priority, communication may be garbled. However,
* these functions are also slow enough (~1ms per call) that it's really not
* desirable to put them at high priority. So make sure you check the
* confirmation code from the slave for any communication, and retry a few
* times in case of failure. */
#ifndef __CROS_EC_ONEWIRE_H
#define __CROS_EC_ONEWIRE_H
#include "common.h"
/* Initialize the module. */
int onewire_init(void);
/* Reset the 1-wire bus. Returns error if presence detect fails. */
int onewire_reset(void);
/* Read a byte from the 1-wire bus. Returns the byte. */
int onewire_read(void);
/* Write a byte to the 1-wire bus. */
void onewire_write(int data);
#endif /* __CROS_EC_ONEWIRE_H */
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