tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20#include <linux/module.h>
21
22#include <asm/mach-ar7/gpio.h>
23
24static const char *ar7_gpio_list[AR7_GPIO_MAX];
25
26int gpio_request(unsigned gpio, const char *label)
27{
28 if (gpio >= AR7_GPIO_MAX)
29 return -EINVAL;
30
31 if (ar7_gpio_list[gpio])
32 return -EBUSY;
33
34 if (label)
35 ar7_gpio_list[gpio] = label;
36 else
37 ar7_gpio_list[gpio] = "busy";
38
39 return 0;
40}
41EXPORT_SYMBOL(gpio_request);
42
43void gpio_free(unsigned gpio)
44{
45 BUG_ON(!ar7_gpio_list[gpio]);
46 ar7_gpio_list[gpio] = NULL;
47}
48EXPORT_SYMBOL(gpio_free);