1932811f42
Change matrix-keymap helper to be out-of-line, like sparse keymap, allow the helper perform basic keymap validation and return errors, and prepare for device tree support. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/*
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* Helpers for matrix keyboard bindings
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*
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* Copyright (C) 2012 Google, Inc
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*
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* Author:
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* Olof Johansson <olof@lixom.net>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/input.h>
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#include <linux/of.h>
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#include <linux/export.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/input/matrix_keypad.h>
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/**
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* matrix_keypad_build_keymap - convert platform keymap into matrix keymap
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* @keymap_data: keymap supplied by the platform code
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* @keymap_name: name of device tree property containing keymap (if device
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* tree support is enabled).
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* @rows: number of rows in target keymap array
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* @cols: number of cols in target keymap array
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* @keymap: expanded version of keymap that is suitable for use by
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* matrix keyboard driver
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* @input_dev: input devices for which we are setting up the keymap
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*
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* This function converts platform keymap (encoded with KEY() macro) into
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* an array of keycodes that is suitable for using in a standard matrix
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* keyboard driver that uses row and col as indices.
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*/
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int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
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const char *keymap_name,
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unsigned int rows, unsigned int cols,
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unsigned short *keymap,
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struct input_dev *input_dev)
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{
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unsigned int row_shift = get_count_order(cols);
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int i;
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input_dev->keycode = keymap;
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input_dev->keycodesize = sizeof(*keymap);
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input_dev->keycodemax = rows << row_shift;
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__set_bit(EV_KEY, input_dev->evbit);
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for (i = 0; i < keymap_data->keymap_size; i++) {
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unsigned int key = keymap_data->keymap[i];
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unsigned int row = KEY_ROW(key);
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unsigned int col = KEY_COL(key);
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unsigned short code = KEY_VAL(key);
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if (row >= rows || col >= cols) {
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dev_err(input_dev->dev.parent,
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"%s: invalid keymap entry %d (row: %d, col: %d, rows: %d, cols: %d)\n",
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__func__, i, row, col, rows, cols);
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return -EINVAL;
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}
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keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
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__set_bit(code, input_dev->keybit);
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}
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__clear_bit(KEY_RESERVED, input_dev->keybit);
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return 0;
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}
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EXPORT_SYMBOL(matrix_keypad_build_keymap);
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#ifdef CONFIG_OF
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struct matrix_keymap_data *
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matrix_keyboard_of_fill_keymap(struct device_node *np,
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const char *propname)
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{
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struct matrix_keymap_data *kd;
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u32 *keymap;
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int proplen, i;
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const __be32 *prop;
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if (!np)
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return NULL;
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if (!propname)
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propname = "linux,keymap";
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prop = of_get_property(np, propname, &proplen);
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if (!prop)
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return NULL;
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if (proplen % sizeof(u32)) {
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pr_warn("Malformed keymap property %s in %s\n",
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propname, np->full_name);
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return NULL;
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}
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kd = kzalloc(sizeof(*kd), GFP_KERNEL);
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if (!kd)
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return NULL;
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kd->keymap = keymap = kzalloc(proplen, GFP_KERNEL);
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if (!kd->keymap) {
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kfree(kd);
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return NULL;
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}
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kd->keymap_size = proplen / sizeof(u32);
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for (i = 0; i < kd->keymap_size; i++) {
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u32 tmp = be32_to_cpup(prop + i);
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int key_code, row, col;
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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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keymap[i] = KEY(row, col, key_code);
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}
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return kd;
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}
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EXPORT_SYMBOL_GPL(matrix_keyboard_of_fill_keymap);
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void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd)
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{
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if (kd) {
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kfree(kd->keymap);
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kfree(kd);
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}
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}
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EXPORT_SYMBOL_GPL(matrix_keyboard_of_free_keymap);
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#endif
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