mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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*/
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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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int ghost_filter; /* non-zero to enable ghost filter */
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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 udevice *dev, struct key_matrix *config);
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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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* @param ghost_filter Non-zero to enable ghost filtering
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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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int ghost_filter);
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#endif
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