linux/include/linux/input/sparse-keymap.h

/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _SPARSE_KEYMAP_H
#define _SPARSE_KEYMAP_H

/*
 * Copyright (c) 2009 Dmitry Torokhov
 */

#define KE_END …
#define KE_KEY …
#define KE_SW …
#define KE_VSW …
#define KE_IGNORE …
#define KE_LAST …

/**
 * struct key_entry - keymap entry for use in sparse keymap
 * @type: Type of the key entry (KE_KEY, KE_SW, KE_VSW, KE_END);
 *	drivers are allowed to extend the list with their own
 *	private definitions.
 * @code: Device-specific data identifying the button/switch
 * @keycode: KEY_* code assigned to a key/button
 * @sw: struct with code/value used by KE_SW and KE_VSW
 * @sw.code: SW_* code assigned to a switch
 * @sw.value: Value that should be sent in an input even when KE_SW
 *	switch is toggled. KE_VSW switches ignore this field and
 *	expect driver to supply value for the event.
 *
 * This structure defines an entry in a sparse keymap used by some
 * input devices for which traditional table-based approach is not
 * suitable.
 */
struct key_entry { … };

struct key_entry *sparse_keymap_entry_from_scancode(struct input_dev *dev,
						    unsigned int code);
struct key_entry *sparse_keymap_entry_from_keycode(struct input_dev *dev,
						   unsigned int code);
int sparse_keymap_setup(struct input_dev *dev,
			const struct key_entry *keymap,
			int (*setup)(struct input_dev *, struct key_entry *));

void sparse_keymap_report_entry(struct input_dev *dev, const struct key_entry *ke,
				unsigned int value, bool autorelease);

bool sparse_keymap_report_event(struct input_dev *dev, unsigned int code,
				unsigned int value, bool autorelease);

#endif /* _SPARSE_KEYMAP_H */