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author | John Crispin <john@openwrt.org> | 2008-01-26 04:24:05 +0000 |
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committer | John Crispin <john@openwrt.org> | 2008-01-26 04:24:05 +0000 |
commit | 8f39c35159a208f1d36b9912c5d307c543203b2c (patch) | |
tree | 8dbcb9d395715c1aa5bef2a4c6b6d75defb43dbb /package/gpioctl/src/main.c | |
parent | d7b86662f7fccf36e3091cdd5f7116d0a0a28279 (diff) | |
download | master-31e0f0ae-8f39c35159a208f1d36b9912c5d307c543203b2c.tar.gz master-31e0f0ae-8f39c35159a208f1d36b9912c5d307c543203b2c.tar.bz2 master-31e0f0ae-8f39c35159a208f1d36b9912c5d307c543203b2c.zip |
add userspace tool for gpio_dev
SVN-Revision: 10267
Diffstat (limited to 'package/gpioctl/src/main.c')
-rw-r--r-- | package/gpioctl/src/main.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/package/gpioctl/src/main.c b/package/gpioctl/src/main.c new file mode 100644 index 0000000000..9aa317350f --- /dev/null +++ b/package/gpioctl/src/main.c @@ -0,0 +1,76 @@ +/* +* 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., 59 Temple Place, Suite 330, Boston, MA02111-1307USA +* +* Feedback, Bugs... blogic@openwrt.org +* +*/ + +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <linux/gpio_dev.h> +#include <linux/ioctl.h> + +void +print_usage() +{ + printf("gpioctl dirin|dirout|get|set|clear gpio\n"); + exit(0); +} + +int +main(int argc, char **argv) +{ + int gpio_pin; + int fd; + int result = 0; + + if (argc != 3) + { + print_usage(); + } + + if ((fd = open("/dev/gpio", O_RDWR)) < 0) + { + printf("Error whilst opening /dev/gpio\n"); + return -1; + } + + gpio_pin = atoi(argv[2]); + + printf("using gpio pin %d\n", gpio_pin); + + if (!strcmp(argv[1], "dirin")) + { + ioctl(fd, GPIO_DIR_IN, gpio_pin); + } else if (!strcmp(argv[1], "dirout")) + { + ioctl(fd, GPIO_DIR_OUT, gpio_pin); + } else if (!strcmp(argv[1], "get")) + { + result = ioctl(fd, GPIO_GET, gpio_pin); + printf("Pin %d is %s\n", (result ? "HIGH" : "LOW")); + } else if (!strcmp(argv[1], "set")) + { + ioctl(fd, GPIO_SET, gpio_pin); + } else if (!strcmp(argv[1], "clear")) + { + ioctl(fd, GPIO_CLEAR, gpio_pin); + } else print_usage(); + + return result; +} |