50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
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* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <asm/ar7/gpio.h>
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static const char *ar7_gpio_list[TITAN_GPIO_MAX];
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int gpio_request(unsigned gpio, const char *label)
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{
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if (gpio >= (ar7_is_titan() ? TITAN_GPIO_MAX : AR7_GPIO_MAX))
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return -EINVAL;
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if (ar7_gpio_list[gpio])
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return -EBUSY;
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if (label) {
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ar7_gpio_list[gpio] = label;
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} else {
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ar7_gpio_list[gpio] = "busy";
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}
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return 0;
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}
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EXPORT_SYMBOL(gpio_request);
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void gpio_free(unsigned gpio)
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{
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BUG_ON(!ar7_gpio_list[gpio]);
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ar7_gpio_list[gpio] = NULL;
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}
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EXPORT_SYMBOL(gpio_free);
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