diff options
Diffstat (limited to 'target/linux/ar7/files-2.6.30/arch/mips/ar7/gpio.c')
| -rw-r--r-- | target/linux/ar7/files-2.6.30/arch/mips/ar7/gpio.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/target/linux/ar7/files-2.6.30/arch/mips/ar7/gpio.c b/target/linux/ar7/files-2.6.30/arch/mips/ar7/gpio.c new file mode 100644 index 0000000000..56860f46d5 --- /dev/null +++ b/target/linux/ar7/files-2.6.30/arch/mips/ar7/gpio.c @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> + * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/module.h> + +#include <asm/ar7/gpio.h> + +static const char *ar7_gpio_list[TITAN_GPIO_MAX]; + +int gpio_request(unsigned gpio, const char *label) +{ + if (gpio >= (ar7_is_titan() ? TITAN_GPIO_MAX : AR7_GPIO_MAX)) + return -EINVAL; + + if (ar7_gpio_list[gpio]) + return -EBUSY; + + if (label) { + ar7_gpio_list[gpio] = label; + } else { + ar7_gpio_list[gpio] = "busy"; + } + + return 0; +} +EXPORT_SYMBOL(gpio_request); + +void gpio_free(unsigned gpio) +{ + BUG_ON(!ar7_gpio_list[gpio]); + ar7_gpio_list[gpio] = NULL; +} +EXPORT_SYMBOL(gpio_free); |