mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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546aeddc97
This CL adds a simple FIFO to store keystrokes. The keyboard_scan() function will push keystrokes into the FIFO and is the only producer, while keyboard_get_scan() will pop entries and is the only consumer. BUG=chrome-os-partner:9594 TEST=tested on daisy Signed-off-by: David Hendricks <dhendrix@chromium.org> Testing was mostly subjectively done by typing a sentence quickly at the Chrome UI. Change-Id: I6faff41b0f16b75d6426df13a239f84eb62634ec
38 lines
1.1 KiB
C
38 lines
1.1 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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/* Keyboard scanner module for Chrome EC */
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#ifndef __CROS_EC_KEYBOARD_SCAN_H
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#define __CROS_EC_KEYBOARD_SCAN_H
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#include "common.h"
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/* Initializes the module. */
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int keyboard_scan_init(void);
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/* Returns non-zero if recovery key was pressed at boot. */
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int keyboard_scan_recovery_pressed(void);
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/**
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* Get the scan data from the keyboard.
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*
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* This returns the results of the last keyboard scan, by pointing the
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* supplied buffer to it, and returning the number of bytes available.
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*
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* The supplied buffer can be used directly if required, but in that case
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* the number of bytes available is limited to 'max_bytes'.
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*
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* @param buffp Pointer to buffer to contain data
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* @param max_bytes Maximum number of bytes available in *buffp
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* @return number of bytes available, or -1 for error
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*/
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int keyboard_get_scan(uint8_t **buffp, int max_bytes);
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/* clear any saved keyboard state (empty FIFO, etc) */
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void keyboard_clear_state(void);
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#endif /* __CROS_KEYBOARD_SCAN_H */
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