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e54d1284ff
CROS_EC_DEV_IOCRDMEM must be used on architecture where legacy IO mapped
registers are accessed inderectly via EMI. The kernel is taking care of
the translation.
TEST=Check on reks that we need to use the IOCTL.
BUG=chrome-os-partner:52550,chromium:602832
BRANCH=none
This reverts commit de45353bbd ("ectool: Remove CROS_EC_DEV_IOCRDMEM").
Change-Id: I8efad56df90c58c25bdc9ccd70a508547e629a77
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/340348
Reviewed-by: Shawn N <shawnn@chromium.org>
78 lines
2.4 KiB
C
78 lines
2.4 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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* For hysterical raisins, there are several mechanisms for communicating with
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* the EC. This abstracts them.
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*/
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#ifndef __UTIL_COMM_HOST_H
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#define __UTIL_COMM_HOST_H
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#include "common.h"
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#include "ec_commands.h"
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/* ec_command return value for non-success result from EC */
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#define EECRESULT 1000
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/* Maximum output and input sizes for EC command, in bytes */
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extern int ec_max_outsize, ec_max_insize;
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/*
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* Maximum-size output and input buffers, for use by callers. This saves each
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* caller needing to allocate/free its own buffers.
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*/
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extern void *ec_outbuf;
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extern void *ec_inbuf;
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/* Interfaces to allow for comm_init() */
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enum comm_interface {
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COMM_DEV = (1 << 0),
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COMM_LPC = (1 << 1),
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COMM_I2C = (1 << 2),
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COMM_ALL = -1
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};
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/**
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* Perform initializations needed for subsequent requests
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*
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* @param interfaces Interfaces to try; use COMM_ALL to try all of them.
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* @param device_name For DEV option, the device file to use.
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* @return 0 in case of success, or error code.
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*/
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int comm_init(int interfaces, const char *device_name);
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/**
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* Send a command to the EC. Returns the length of output data returned (0 if
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* none), or negative on error.
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*/
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int ec_command(int command, int version,
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const void *outdata, int outsize, /* to the EC */
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void *indata, int insize); /* from the EC */
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/**
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* Set the offset to be applied to the command number when ec_command() calls
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* ec_command_proto().
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*/
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void set_command_offset(int offset);
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/**
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* Send a command to the EC. Returns the length of output data returned (0 if
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* none), or negative on error. This is the low-level interface implemented
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* by the protocol-specific driver. DO NOT call this version directly from
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* anywhere but ec_command(), or the --device option will not work.
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*/
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extern int (*ec_command_proto)(int command, int version,
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const void *outdata, int outsize, /* to EC */
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void *indata, int insize); /* from EC */
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/**
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* Return the content of the EC information area mapped as "memory".
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* The offsets are defined by the EC_MEMMAP_ constants. Returns the number
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* of bytes read, or negative on error. Specifying bytes=0 will read a
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* string (always including the trailing '\0').
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*/
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extern int (*ec_readmem)(int offset, int bytes, void *dest);
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#endif /* __UTIL_COMM_HOST_H */
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