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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.
*/
/* Keyboard scanner module for Chrome EC */
#ifndef __CROS_EC_KEYBOARD_SCAN_H
#define __CROS_EC_KEYBOARD_SCAN_H
#include "common.h"
#include "keyboard_config.h"
struct keyboard_scan_config {
/* Delay between setting up output and waiting for it to settle */
uint16_t output_settle_us;
/* Times for debouncing key-down and key-up */
uint16_t debounce_down_us;
uint16_t debounce_up_us;
/* Time between start of scans when in polling mode */
uint16_t scan_period_us;
/*
* Minimum time between end of one scan and start of the next one.
* This ensures keyboard scanning doesn't starve the rest of the system
* if the scan period is set too short, or if other higher-priority
* system activity is starving the keyboard scan task too.
*/
uint16_t min_post_scan_delay_us;
/* Revert to interrupt mode after no keyboard activity for this long */
uint32_t poll_timeout_us;
/* Mask with 1 bits only for keys that actually exist */
uint8_t actual_key_mask[KEYBOARD_COLS];
};
/**
* Initializes the module.
*/
void keyboard_scan_init(void);
/**
* Return a pointer to the keyboard scan config.
*/
struct keyboard_scan_config *keyboard_scan_get_config(void);
/*
* Which is probably this.
*/
extern struct keyboard_scan_config keyscan_config;
/* Key held down at keyboard-controlled reset boot time. */
enum boot_key {
BOOT_KEY_NONE, /* No keys other than keyboard-controlled reset keys */
BOOT_KEY_ESC,
BOOT_KEY_DOWN_ARROW,
BOOT_KEY_OTHER = -1, /* None of the above */
};
#ifdef HAS_TASK_KEYSCAN
/**
* Return the key held down at boot time in addition to the keyboard-controlled
* reset keys. Returns BOOT_KEY_OTHER if none of the keys specifically checked
* was pressed, or reset was not caused by a keyboard-controlled reset.
*/
enum boot_key keyboard_scan_get_boot_key(void);
#else
static inline enum boot_key keyboard_scan_get_boot_key(void)
{
return BOOT_KEY_NONE;
}
#endif
/**
* Return a pointer to the current debounced keyboard matrix state, which is
* KEYBOARD_COLS bytes long.
*/
const uint8_t *keyboard_scan_get_state(void);
#ifdef HAS_TASK_KEYSCAN
/**
* Enables/disables keyboard matrix scan.
*/
void keyboard_scan_enable(int enable);
#else
static inline void keyboard_scan_enable(int enable) { }
#endif
/**
* Returns if keyboard matrix scanning is enabled/disabled.
*/
int keyboard_scan_is_enabled(void);
#ifdef CONFIG_KEYBOARD_SUPPRESS_NOISE
/**
* Indicate to audio codec that a key has been pressed.
*
* Boards may supply this function to suppress audio noise.
*/
void keyboard_suppress_noise(void);
#endif
#endif /* __CROS_EC_KEYBOARD_SCAN_H */
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