--- /dev/null
+/* 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 <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include <linux/usbdevice_fs.h>
+
+
+static char *usbfs = NULL;
+
+struct usbentry {
+ int bus_num;
+ int dev_num;
+ int vendor_id;
+ int product_id;
+ char vendor_name[128];
+ char product_name[128];
+};
+
+
+static bool find_usbfs(void)
+{
+ FILE *mtab;
+
+ char buf[1024], type[32];
+ static char path[1024];
+
+ if ((mtab = fopen("/proc/mounts", "r")) != NULL)
+ {
+ while (fgets(buf, sizeof(buf), mtab))
+ {
+ if (sscanf(buf, "%*s %1023s %31s ", path, type) == 2 &&
+ !strncmp(type, "usbfs", 5))
+ {
+ usbfs = path;
+ break;
+ }
+ }
+
+ fclose(mtab);
+ }
+
+ return !!usbfs;
+}
+
+static FILE * open_devlist(void)
+{
+ char buf[1024];
+ snprintf(buf, sizeof(buf), "%s/devices", usbfs);
+ return fopen(buf, "r");
+}
+
+static void close_devlist(FILE *devs)
+{
+ fclose(devs);
+}
+
+static struct usbentry * parse_devlist(FILE *devs)
+{
+ char buf[1024];
+ static struct usbentry dev;
+
+ memset(&dev, 0, sizeof(dev));
+
+ while (fgets(buf, sizeof(buf), devs))
+ {
+ buf[strlen(buf)-1] = 0;
+
+ switch (buf[0])
+ {
+ case 'T':
+ sscanf(buf, "T: Bus=%d Lev=%*d Prnt=%*d Port=%*d Cnt=%*d Dev#=%d",
+ &dev.bus_num, &dev.dev_num);
+ break;
+
+ case 'P':
+ sscanf(buf, "P: Vendor=%x ProdID=%x",
+ &dev.vendor_id, &dev.product_id);
+ break;
+
+ case 'S':
+ if (!strncmp(buf, "S: Manufacturer=", 17))
+ snprintf(dev.vendor_name, sizeof(dev.vendor_name),
+ "%s", buf+17);
+ else if (!strncmp(buf, "S: Product=", 12))
+ snprintf(dev.product_name, sizeof(dev.product_name),
+ "%s", buf+12);
+ break;
+ }
+
+ if (dev.product_name[0])
+ return &dev;
+ }
+
+ return NULL;
+}
+
+static void list_devices(void)
+{
+ FILE *devs = open_devlist();
+ struct usbentry *dev;
+
+ if (!devs)
+ return;
+
+ while ((dev = parse_devlist(devs)) != NULL)
+ {
+ printf(" Number %03d/%03d ID %04x:%04x %s\n",
+ dev->bus_num, dev->dev_num,
+ dev->vendor_id, dev->product_id,
+ dev->product_name);
+ }
+
+ close_devlist(devs);
+}
+
+struct usbentry * find_device(int *bus, int *dev,
+ int *vid, int *pid,
+ const char *product)
+{
+ FILE *devs = open_devlist();
+
+ struct usbentry *e, *match = NULL;
+
+ if (!devs)
+ return NULL;
+
+ while ((e = parse_devlist(devs)) != NULL)
+ {
+ if ((bus && (e->bus_num == *bus) && (e->dev_num == *dev)) ||
+ (vid && (e->vendor_id == *vid) && (e->product_id == *pid)) ||
+ (product && !strcasecmp(e->product_name, product)))
+ {
+ match = e;
+ break;
+ }
+ }
+
+ close_devlist(devs);
+
+ return match;
+}
+
+static void reset_device(struct usbentry *dev)
+{
+ int fd;
+ char path[1024];
+
+ snprintf(path, sizeof(path), "%s/%03d/%03d",
+ usbfs, dev->bus_num, dev->dev_num);
+
+ printf("Resetting %s ... ", dev->product_name);
+
+ if ((fd = open(path, O_WRONLY)) > -1)
+ {
+ if (ioctl(fd, USBDEVFS_RESET, 0) < 0)
+ printf("failed [%s]\n", strerror(errno));
+ else
+ printf("ok\n");
+
+ close(fd);
+ }
+ else
+ {
+ printf("can't open [%s]\n", strerror(errno));
+ }
+}
+
+
+int main(int argc, char **argv)
+{
+ int id1, id2;
+ struct usbentry *dev;
+
+ if (!find_usbfs())
+ {
+ fprintf(stderr, "Unable to find usbfs, is it mounted?\n");
+ return 1;
+ }
+
+ if ((argc == 2) && (sscanf(argv[1], "%3d/%3d", &id1, &id2) == 2))
+ {
+ dev = find_device(&id1, &id2, NULL, NULL, NULL);
+ }
+ else if ((argc == 2) && (sscanf(argv[1], "%4x:%4x", &id1, &id2) == 2))
+ {
+ dev = find_device(NULL, NULL, &id1, &id2, NULL);
+ }
+ else if ((argc == 2) && strlen(argv[1]) < 128)
+ {
+ dev = find_device(NULL, NULL, NULL, NULL, argv[1]);
+ }
+ else
+ {
+ printf("Usage:\n"
+ " usbreset PPPP:VVVV - reset by product and vendor id\n"
+ " usbreset BBB/DDD - reset by bus and device number\n"
+ " usbreset \"Product\" - reset by product name\n\n"
+ "Devices:\n");
+ list_devices();
+ return 1;
+ }
+
+ if (!dev)
+ {
+ fprintf(stderr, "No such device found\n");
+ return 1;
+ }
+
+ reset_device(dev);
+ return 0;
+}
projects / openwrt / openwrt.git / blobdiff