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2f4fd74df5
Pull-down means backlight is present, pull-up means backlight
is absent.
After detection, we still apply internal pull-down on the GPIO,
to make sure old boards with both pull-up and pull-down stuffed
do not always keep backlight on.
BRANCH=none
BUG=b:67722756
TEST=On reworked board with pull-down on backlight pin,
backlight works, and "Backlight present" shown in console.
TEST=On old board with both pull-up and pull-down, backlight is
off by default, and "Backlight not present" shown in console.
Change-Id: I6988c6ef8f4d155a08967db34f72d7ea4c835306
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/538458
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
58 lines
1.4 KiB
C
58 lines
1.4 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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* Keyboard protocol interface
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*/
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#ifndef __CROS_EC_KEYBOARD_PROTOCOL_H
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#define __CROS_EC_KEYBOARD_PROTOCOL_H
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#include "common.h"
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#include "button.h"
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/* Routines common to all protocols */
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/**
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* Clear the keyboard buffer to host.
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*/
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void keyboard_clear_buffer(void);
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/*
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* Respond to button changes. Implemented by a host-specific
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* handler.
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*
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* @param button The button that changed.
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* @param is_pressed Whether the button is now pressed.
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*/
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void keyboard_update_button(enum keyboard_button_type button, int is_pressed);
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/* Protocol-specific includes */
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#ifdef CONFIG_KEYBOARD_PROTOCOL_8042
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#include "keyboard_8042.h"
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#endif
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#ifdef CONFIG_KEYBOARD_PROTOCOL_MKBP
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#include "keyboard_mkbp.h"
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/* MKBP protocol takes the whole keyboard matrix, and does not care about
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* individual key presses.
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*/
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static inline void keyboard_state_changed(int row, int col, int is_pressed) {}
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#else
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/**
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* Called by keyboard scan code once any key state change (after de-bounce),
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*
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* This function will look up matrix table and convert scancode host.
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*/
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void keyboard_state_changed(int row, int col, int is_pressed);
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#endif
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/**
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* Returns true if keyboard backlight is present/detected.
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*/
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int board_has_keyboard_backlight(void);
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#endif /* __CROS_EC_KEYBOARD_PROTOCOL_H */
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