2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307USA
16 * Feedback, Bugs... blogic@openwrt.org
22 #include <sys/types.h>
25 #include <linux/gpio_dev.h>
26 #include <linux/ioctl.h>
31 printf("gpioctl dirin|dirout|get|set|clear gpio\n");
36 main(int argc, char **argv)
47 if ((fd = open("/dev/gpio", O_RDWR)) < 0)
49 printf("Error whilst opening /dev/gpio\n");
53 gpio_pin = atoi(argv[2]);
55 printf("using gpio pin %d\n", gpio_pin);
57 if (!strcmp(argv[1], "dirin"))
59 ioctl(fd, GPIO_DIR_IN, gpio_pin);
60 } else if (!strcmp(argv[1], "dirout"))
62 ioctl(fd, GPIO_DIR_OUT, gpio_pin);
63 } else if (!strcmp(argv[1], "get"))
65 result = ioctl(fd, GPIO_GET, gpio_pin);
66 printf("Pin %d is %s\n", gpio_pin, (result ? "HIGH" : "LOW"));
67 } else if (!strcmp(argv[1], "set"))
69 ioctl(fd, GPIO_SET, gpio_pin);
70 } else if (!strcmp(argv[1], "clear"))
72 ioctl(fd, GPIO_CLEAR, gpio_pin);