2cd36877ad
This adds a simple device tree binding for simple key matrix data and a helper to fill in the platform data. Signed-off-by: Olof Johansson <olof@lixom.net> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
/*
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* Helpers for open firmware 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/input/matrix_keypad.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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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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