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/* Copyright (c) 2011 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.
*
* i8042.h -- defines the interface between EC core and the EC lib, which
* talks to the LPC driver (on the EC side) peering to the keyboard driver
* (on the host side).
*
* The EC lib implements this interface.
*/
#ifndef __HOST_INTERFACE_I8042_H
#define __HOST_INTERFACE_I8042_H
#include "cros_ec/include/ec_common.h"
/*
* Register the i8042 callback to EC lib.
*
* The callback function would return an integer to indicate how many bytes
* contain in output (max len is MAX_I8042_OUTPUT_LEN defined below).
* Then the EC lib would output those bytes via port 0x60 one-by-one.
*
* Registering a NULL pointer can remove any registered callback.
*/
typedef int (*EcI8042Callback) (
uint8_t command,
uint8_t data,
uint8_t *output);
EcError EcI8042RegisterCallback(EcI8042Callback callback);
#define MAX_I8042_OUTPUT_LEN 4
/* Send the scan code to the host. The EC lib will push the scan code bytes
* to host via port 0x60 and assert the IBF flag to trigger an interrupt.
* The EC lib must queue them if the host cannot read the previous byte away
* in time.
*
* Return:
* EC_ERROR_BUFFER_FULL -- the queue to host is full. Try again?
*/
EcError EcI8042SendScanCode(int len, uint8_t *scan_code);
#endif /* __HOST_INTERFACE_I8042_H */
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