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/* Copyright (c) 2013 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.
*
* For hysterical raisins, there are several mechanisms for communicating with
* the EC. This abstracts them.
*/
#ifndef COMM_HOST_H
#define COMM_HOST_H
#include "common.h"
#include "ec_commands.h"
/* ec_command return value for non-success result from EC */
#define EECRESULT 1000
/* Maximum output and input sizes for EC command, in bytes */
extern int ec_max_outsize, ec_max_insize;
/*
* Maximum-size output and input buffers, for use by callers. This saves each
* caller needing to allocate/free its own buffers.
*/
extern void *ec_outbuf;
extern void *ec_inbuf;
/**
* Perform initializations needed for subsequent requests
*
* returns 0 in case of success or error code. */
int comm_init(void);
/**
* Send a command to the EC. Returns the length of output data returned (0 if
* none), or negative on error.
*/
extern int (*ec_command)(int command, int version,
const void *outdata, int outsize, /* to the EC */
void *indata, int insize); /* from the EC */
/**
* Return the content of the EC information area mapped as "memory".
* The offsets are defined by the EC_MEMMAP_ constants. Returns the number
* of bytes read, or negative on error. Specifying bytes=0 will read a
* string (always including the trailing '\0').
*/
extern int (*ec_readmem)(int offset, int bytes, void *dest);
#endif /* COMM_HOST_H */
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