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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.
*
* Raw access to keyboard GPIOs.
*
* The keyboard matrix is read by driving output signals on the column lines
* and reading the row lines.
*/
#ifndef __CROS_EC_KEYBOARD_RAW_H
#define __CROS_EC_KEYBOARD_RAW_H
#include "common.h"
#include "gpio.h"
/* Column values for keyboard_raw_drive_column() */
enum keyboard_column_index {
KEYBOARD_COLUMN_ALL = -2, /* Drive all columns */
KEYBOARD_COLUMN_NONE = -1, /* Drive no columns (tri-state all) */
/* 0 ~ KEYBOARD_COLS-1 for the corresponding column */
};
/**
* Initialize the raw keyboard interface.
*
* Must be called before any other functions in this interface.
*/
void keyboard_raw_init(void);
/**
* Finish intitialization after task scheduling has started.
*
* Call from the keyboard scan task.
*/
void keyboard_raw_task_start(void);
/**
* Drive the specified column low.
*
* Other columns are tristated. See enum keyboard_column_index for special
* values for <col>.
*/
void keyboard_raw_drive_column(int col);
/**
* Read raw row state.
*
* Bits are 1 if signal is present, 0 if not present.
*/
int keyboard_raw_read_rows(void);
/**
* Enable or disable keyboard interrupts.
*
* Enabling interrupts will clear any pending interrupt bits. To avoid missing
* any interrupts that occur between the end of scanning and then, you should
* call keyboard_raw_read_rows() after this. If it returns non-zero, disable
* interrupts and go back to polling mode instead of waiting for an interrupt.
*/
void keyboard_raw_enable_interrupt(int enable);
#ifdef CONFIG_TASK_KEYSCAN
/**
* GPIO interrupt for raw keyboard input
*/
void keyboard_raw_gpio_interrupt(enum gpio_signal signal);
#else
#define keyboard_raw_gpio_interrupt NULL
#endif
#endif /* __CROS_EC_KEYBOARD_RAW_H */
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