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https://github.com/AsahiLinux/u-boot
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185f812c41
Sphinx expects Return: and not @return to indicate a return value. find . -name '*.c' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; find . -name '*.h' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
190 lines
4.9 KiB
C
190 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Manage Keyboard Matrices
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*
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* Copyright (c) 2012 The Chromium OS Authors.
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* (C) Copyright 2004 DENX Software Engineering, Wolfgang Denk, wd@denx.de
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*/
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#include <common.h>
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#include <dm.h>
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#include <key_matrix.h>
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#include <log.h>
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#include <malloc.h>
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#include <linux/input.h>
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/**
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* Determine if the current keypress configuration can cause key ghosting
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*
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* We figure this out by seeing if we have two or more keys in the same
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* column, as well as two or more keys in the same row.
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*
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* @param config Keyboard matrix config
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* @param keys List of keys to check
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* @param valid Number of valid keypresses to check
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* Return: 0 if no ghosting is possible, 1 if it is
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*/
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static int has_ghosting(struct key_matrix *config, struct key_matrix_key *keys,
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int valid)
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{
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int key_in_same_col = 0, key_in_same_row = 0;
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int i, j;
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if (!config->ghost_filter || valid < 3)
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return 0;
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for (i = 0; i < valid; i++) {
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/*
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* Find 2 keys such that one key is in the same row
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* and the other is in the same column as the i-th key.
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*/
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for (j = i + 1; j < valid; j++) {
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if (keys[j].col == keys[i].col)
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key_in_same_col = 1;
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if (keys[j].row == keys[i].row)
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key_in_same_row = 1;
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}
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}
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if (key_in_same_col && key_in_same_row)
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return 1;
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else
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return 0;
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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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const u8 *keymap;
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int valid, upto;
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int pos;
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debug("%s: num_keys = %d\n", __func__, num_keys);
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keymap = config->plain_keycode;
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for (valid = upto = 0; upto < num_keys; upto++) {
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struct key_matrix_key *key = &keys[upto];
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debug(" valid=%d, row=%d, col=%d\n", key->valid, key->row,
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key->col);
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if (!key->valid)
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continue;
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pos = key->row * config->num_cols + key->col;
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if (config->fn_keycode && pos == config->fn_pos)
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keymap = config->fn_keycode;
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/* Convert the (row, col) values into a keycode */
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if (valid < max_keycodes)
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keycode[valid++] = keymap[pos];
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debug(" keycode=%d\n", keymap[pos]);
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}
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/* For a ghost key config, ignore the keypresses for this iteration. */
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if (has_ghosting(config, keys, valid)) {
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valid = 0;
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debug(" ghosting detected!\n");
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}
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debug(" %d valid keycodes found\n", valid);
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return valid;
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}
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/**
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* Create a new keycode map from some provided data
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*
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* This decodes a keycode map in the format used by the fdt, which is one
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* word per entry, with the row, col and keycode encoded in that word.
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*
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* We create a (row x col) size byte array with each entry containing the
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* keycode for that (row, col). We also search for map_keycode and return
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* its position if found (this is used for finding the Fn key).
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*
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* @param config Key matrix dimensions structure
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* @param data Keycode data
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* @param len Number of entries in keycode table
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* @param map_keycode Key code to find in the map
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* @param pos Returns position of map_keycode, if found, else -1
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* Return: map Pointer to allocated map
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*/
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static uchar *create_keymap(struct key_matrix *config, const u32 *data, int len,
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int map_keycode, int *pos)
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{
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uchar *map;
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if (pos)
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*pos = -1;
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map = (uchar *)calloc(1, config->key_count);
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if (!map) {
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debug("%s: failed to malloc %d bytes\n", __func__,
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config->key_count);
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return NULL;
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}
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for (; len >= sizeof(u32); data++, len -= 4) {
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u32 tmp = fdt32_to_cpu(*data);
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int key_code, row, col;
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int entry;
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row = (tmp >> 24) & 0xff;
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col = (tmp >> 16) & 0xff;
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key_code = tmp & 0xffff;
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entry = row * config->num_cols + col;
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map[entry] = key_code;
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debug(" map %d, %d: pos=%d, keycode=%d\n", row, col,
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entry, key_code);
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if (pos && map_keycode == key_code)
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*pos = entry;
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}
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return map;
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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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const u32 *prop;
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int proplen;
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uchar *plain_keycode;
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prop = dev_read_prop(dev, "linux,keymap", &proplen);
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/* Basic keymap is required */
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if (!prop) {
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debug("%s: cannot find keycode-plain map\n", __func__);
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return -1;
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}
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plain_keycode = create_keymap(config, prop, proplen, KEY_FN,
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&config->fn_pos);
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config->plain_keycode = plain_keycode;
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/* Conversion error -> fail */
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if (!config->plain_keycode)
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return -1;
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prop = dev_read_prop(dev, "linux,fn-keymap", &proplen);
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/* fn keymap is optional */
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if (!prop)
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goto done;
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config->fn_keycode = create_keymap(config, prop, proplen, -1, NULL);
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/* Conversion error -> fail */
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if (!config->fn_keycode) {
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free(plain_keycode);
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return -1;
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}
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done:
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debug("%s: Decoded key maps %p, %p from fdt\n", __func__,
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config->plain_keycode, config->fn_keycode);
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return 0;
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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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{
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memset(config, '\0', sizeof(*config));
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config->num_rows = rows;
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config->num_cols = cols;
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config->key_count = rows * cols;
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config->ghost_filter = ghost_filter;
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assert(config->key_count > 0);
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return 0;
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}
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