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