76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
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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., 59 Temple Place, Suite 330, Boston, MA02111-1307USA
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*
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* Feedback, Bugs... blogic@openwrt.org
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/gpio_dev.h>
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#include <linux/ioctl.h>
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void
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print_usage()
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{
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printf("gpioctl dirin|dirout|get|set|clear gpio\n");
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exit(0);
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}
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int
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main(int argc, char **argv)
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{
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int gpio_pin;
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int fd;
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int result = 0;
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if (argc != 3)
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{
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print_usage();
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}
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if ((fd = open("/dev/gpio", O_RDWR)) < 0)
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{
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printf("Error whilst opening /dev/gpio\n");
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return -1;
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}
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gpio_pin = atoi(argv[2]);
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printf("using gpio pin %d\n", gpio_pin);
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if (!strcmp(argv[1], "dirin"))
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{
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ioctl(fd, GPIO_DIR_IN, gpio_pin);
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} else if (!strcmp(argv[1], "dirout"))
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{
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ioctl(fd, GPIO_DIR_OUT, gpio_pin);
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} else if (!strcmp(argv[1], "get"))
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{
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result = ioctl(fd, GPIO_GET, gpio_pin);
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printf("Pin %d is %s\n", gpio_pin, (result ? "HIGH" : "LOW"));
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} else if (!strcmp(argv[1], "set"))
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{
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ioctl(fd, GPIO_SET, gpio_pin);
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} else if (!strcmp(argv[1], "clear"))
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{
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ioctl(fd, GPIO_CLEAR, gpio_pin);
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} else print_usage();
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return result;
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}
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