/* * Helpers for open firmware matrix keyboard bindings * * Copyright (C) 2012 Google, Inc * * Author: *	Olof Johansson <olof@lixom.net> * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * 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. * */ #include <linux/kernel.h>#include <linux/types.h>#include <linux/input.h>#include <linux/of.h>#include <linux/input/matrix_keypad.h>#include <linux/export.h>#include <linux/gfp.h>#include <linux/slab.h> struct matrix_keymap_data *matrix_keyboard_of_fill_keymap(struct device_node *np,			       const char *propname){	struct matrix_keymap_data *kd;	u32 *keymap;	int proplen, i;	const __be32 *prop; 	if (!np)		return NULL; 	if (!propname)		propname = "linux,keymap"; 	prop = of_get_property(np, propname, &proplen);	if (!prop)		return NULL; 	if (proplen % sizeof(u32)) {		pr_warn("Malformed keymap property %s in %s\n",			propname, np->full_name);		return NULL;	} 	kd = kzalloc(sizeof(*kd), GFP_KERNEL);	if (!kd)		return NULL; 	kd->keymap = keymap = kzalloc(proplen, GFP_KERNEL);	if (!kd->keymap) {		kfree(kd);		return NULL;	} 	kd->keymap_size = proplen / sizeof(u32); 	for (i = 0; i < kd->keymap_size; i++) {		u32 tmp = be32_to_cpup(prop + i);		int key_code, row, col; 		row = (tmp >> 24) & 0xff;		col = (tmp >> 16) & 0xff;		key_code = tmp & 0xffff;		keymap[i] = KEY(row, col, key_code);	} 	return kd;}EXPORT_SYMBOL_GPL(matrix_keyboard_of_fill_keymap); void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd){	if (kd) {		kfree(kd->keymap);		kfree(kd);	}}EXPORT_SYMBOL_GPL(matrix_keyboard_of_free_keymap);