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 24 static const char *ar7_gpio_list[AR7_GPIO_MAX]; 25 26 int 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 } 41 EXPORT_SYMBOL(gpio_request); 42 43 void gpio_free(unsigned gpio) 44 { 45 BUG_ON(!ar7_gpio_list[gpio]); 46 ar7_gpio_list[gpio] = NULL; 47 } 48 EXPORT_SYMBOL(gpio_free); 49