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authorJo-Philipp Wich <jow@openwrt.org>2011-12-25 13:59:17 +0000
committerJo-Philipp Wich <jow@openwrt.org>2011-12-25 13:59:17 +0000
commit250ef0cb72325e88afa6dfc95f6d9477c62ca1b3 (patch)
tree3c9a33f4b071ab6012f131d62a798549cfd93638 /package/usbreset/src
parent9fa33ceee2e7831dcfc6391b0e9d7b7117c6ef92 (diff)
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add usbreset - a small simple utility to send port rests to selected usb devices (#10394)
SVN-Revision: 29611
Diffstat (limited to 'package/usbreset/src')
-rw-r--r--package/usbreset/src/usbreset.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/package/usbreset/src/usbreset.c b/package/usbreset/src/usbreset.c
new file mode 100644
index 0000000..03d1787
--- /dev/null
+++ b/package/usbreset/src/usbreset.c
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+/* usbreset -- send a USB port reset to a USB device */
+
+/*
+
+http://marc.info/?l=linux-usb-users&m=116827193506484&w=2
+
+and needs mounted usbfs filesystem
+
+ sudo mount -t usbfs none /proc/bus/usb
+
+There is a way to suspend a USB device. In order to use it,
+you must have a kernel with CONFIG_PM_SYSFS_DEPRECATED turned on. To
+suspend a device, do (as root):
+
+ echo -n 2 >/sys/bus/usb/devices/.../power/state
+
+where the "..." is the ID for your device. To unsuspend, do the same
+thing but with a "0" instead of the "2" above.
+
+Note that this mechanism is slated to be removed from the kernel within
+the next year. Hopefully some other mechanism will take its place.
+
+> To reset a
+> device?
+
+Here's a program to do it. You invoke it as either
+
+ usbreset /proc/bus/usb/BBB/DDD
+or
+ usbreset /dev/usbB.D
+
+depending on how your system is set up, where BBB and DDD are the bus and
+device address numbers.
+
+Alan Stern
+
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+
+#include <linux/usbdevice_fs.h>
+
+
+int main(int argc, char **argv)
+{
+ const char *filename;
+ int fd;
+ int rc;
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: usbreset device-filename\n");
+ return 1;
+ }
+ filename = argv[1];
+
+ fd = open(filename, O_WRONLY);
+ if (fd < 0) {
+ perror("Error opening output file");
+ return 1;
+ }
+
+ printf("Resetting USB device %s\n", filename);
+ rc = ioctl(fd, USBDEVFS_RESET, 0);
+ if (rc < 0) {
+ perror("Error in ioctl");
+ return 1;
+ }
+ printf("Reset successful\n");
+
+ close(fd);
+ return 0;
+}