mirror of
https://github.com/u-boot/u-boot.git
synced 2024-11-25 21:24:21 +08:00
71dc6bca4e
Some keyboards will not need a key ghosting filter, so make this feature optional. Signed-off-by: Simon Glass <sjg@chromium.org>
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*
|
|
* Keyboard matrix helper functions
|
|
*
|
|
* Copyright (c) 2012 The Chromium OS Authors.
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef _KEY_MATRIX_H
|
|
#define _KEY_MATRIX_H
|
|
|
|
#include <common.h>
|
|
|
|
/* Information about a matrix keyboard */
|
|
struct key_matrix {
|
|
/* Dimensions of the keyboard matrix, in rows and columns */
|
|
int num_rows;
|
|
int num_cols;
|
|
int key_count; /* number of keys in the matrix (= rows * cols) */
|
|
|
|
/*
|
|
* Information about keycode mappings. The plain_keycode array must
|
|
* exist but fn may be NULL in which case it is not decoded.
|
|
*/
|
|
const u8 *plain_keycode; /* key code for each row / column */
|
|
const u8 *fn_keycode; /* ...when Fn held down */
|
|
int fn_pos; /* position of Fn key in key (or -1) */
|
|
int ghost_filter; /* non-zero to enable ghost filter */
|
|
};
|
|
|
|
/* Information about a particular key (row, column pair) in the matrix */
|
|
struct key_matrix_key {
|
|
uint8_t row; /* row number (0 = first) */
|
|
uint8_t col; /* column number (0 = first) */
|
|
uint8_t valid; /* 1 if valid, 0 to ignore this */
|
|
};
|
|
|
|
/**
|
|
* Decode a set of pressed keys into key codes
|
|
*
|
|
* Given a list of keys that are pressed, this converts this list into
|
|
* a list of key codes. Each of the keys has a valid flag, which can be
|
|
* used to mark a particular key as invalid (so that it is ignored).
|
|
*
|
|
* The plain keymap is used, unless the Fn key is detected along the way,
|
|
* at which point we switch to the Fn key map.
|
|
*
|
|
* If key ghosting is detected, we simply ignore the keys and return 0.
|
|
*
|
|
* @param config Keyboard matrix config
|
|
* @param keys List of keys to process (each is row, col)
|
|
* @param num_keys Number of keys to process
|
|
* @param keycode Returns a list of key codes, decoded from input
|
|
* @param max_keycodes Size of key codes array (suggest 8)
|
|
*
|
|
*/
|
|
int key_matrix_decode(struct key_matrix *config, struct key_matrix_key *keys,
|
|
int num_keys, int keycode[], int max_keycodes);
|
|
|
|
/**
|
|
* Read the keyboard configuration out of the fdt.
|
|
*
|
|
* Decode properties of named "linux,<type>keymap" where <type> is either
|
|
* empty, or "fn-". Then set up the plain key map (and the FN keymap if
|
|
* present).
|
|
*
|
|
* @param config Keyboard matrix config
|
|
* @param blob FDT blob
|
|
* @param node Node containing compatible data
|
|
* @return 0 if ok, -1 on error
|
|
*/
|
|
int key_matrix_decode_fdt(struct key_matrix *config, const void *blob,
|
|
int node);
|
|
|
|
/**
|
|
* Set up a new key matrix.
|
|
*
|
|
* @param config Keyboard matrix config
|
|
* @param rows Number of rows in key matrix
|
|
* @param cols Number of columns in key matrix
|
|
* @param ghost_filter Non-zero to enable ghost filtering
|
|
* @return 0 if ok, -1 on error
|
|
*/
|
|
int key_matrix_init(struct key_matrix *config, int rows, int cols,
|
|
int ghost_filter);
|
|
|
|
#endif
|