Style cleanup
[openwrt/svn-archive/archive.git] / target / linux / ar7 / files / arch / mips / ar7 / gpio.c
1 /*
2 * $Id$
3 *
4 * Copyright (C) 2007 OpenWrt.org
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <linux/module.h>
22
23 #include <asm/ar7/gpio.h>
24
25 static char *ar7_gpio_list[AR7_GPIO_MAX] = { 0, };
26
27 int gpio_request(unsigned gpio, char *label)
28 {
29 if (gpio >= AR7_GPIO_MAX)
30 return -EINVAL;
31
32 if (ar7_gpio_list[gpio])
33 return -EBUSY;
34
35 if (label) {
36 ar7_gpio_list[gpio] = label;
37 } else {
38 ar7_gpio_list[gpio] = "busy";
39 }
40
41 return 0;
42 }
43 EXPORT_SYMBOL(gpio_request);
44
45 void gpio_free(unsigned gpio)
46 {
47 BUG_ON(!ar7_gpio_list[gpio]);
48 ar7_gpio_list[gpio] = NULL;
49 }
50 EXPORT_SYMBOL(gpio_free);