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Diffstat (limited to 'package/utils/usbreset/src/usbreset.c')
| -rw-r--r-- | package/utils/usbreset/src/usbreset.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/package/utils/usbreset/src/usbreset.c b/package/utils/usbreset/src/usbreset.c new file mode 100644 index 0000000..ead30b1 --- /dev/null +++ b/package/utils/usbreset/src/usbreset.c @@ -0,0 +1,235 @@ +/* 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 <ctype.h> +#include <limits.h> +#include <dirent.h> +#include <sys/ioctl.h> +#include <sys/types.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 char *sysfs_attr(const char *dev, const char *attr) +{ + int fd, len = 0; + char path[PATH_MAX]; + static char buf[129]; + + memset(buf, 0, sizeof(buf)); + snprintf(path, sizeof(path) - 1, "/sys/bus/usb/devices/%s/%s", dev, attr); + + if ((fd = open(path, O_RDONLY)) >= 0) + { + len = read(fd, buf, sizeof(buf) - 1); + close(fd); + } + + while (--len > 0 && isspace(buf[len])) + buf[len] = 0; + + return (len >= 0) ? buf : NULL; +} + +static struct usbentry * parse_devlist(DIR *d) +{ + char *attr; + struct dirent *e; + static struct usbentry dev; + + do { + e = readdir(d); + + if (!e) + return NULL; + } + while(!isdigit(e->d_name[0]) || strchr(e->d_name, ':')); + + memset(&dev, 0, sizeof(dev)); + + if ((attr = sysfs_attr(e->d_name, "busnum")) != NULL) + dev.bus_num = strtoul(attr, NULL, 10); + + if ((attr = sysfs_attr(e->d_name, "devnum")) != NULL) + dev.dev_num = strtoul(attr, NULL, 10); + + if ((attr = sysfs_attr(e->d_name, "idVendor")) != NULL) + dev.vendor_id = strtoul(attr, NULL, 16); + + if ((attr = sysfs_attr(e->d_name, "idProduct")) != NULL) + dev.product_id = strtoul(attr, NULL, 16); + + if ((attr = sysfs_attr(e->d_name, "manufacturer")) != NULL) + strcpy(dev.vendor_name, attr); + + if ((attr = sysfs_attr(e->d_name, "product")) != NULL) + strcpy(dev.product_name, attr); + + if (dev.bus_num && dev.dev_num && dev.vendor_id && dev.product_id) + return &dev; + + return NULL; +} + +static void list_devices(void) +{ + DIR *devs = opendir("/sys/bus/usb/devices"); + 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); + } + + closedir(devs); +} + +struct usbentry * find_device(int *bus, int *dev, + int *vid, int *pid, + const char *product) +{ + DIR *devs = opendir("/sys/bus/usb/devices"); + + 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; + } + } + + closedir(devs); + + return match; +} + +static void reset_device(struct usbentry *dev) +{ + int fd; + char path[PATH_MAX]; + + snprintf(path, sizeof(path) - 1, "/dev/bus/usb/%03d/%03d", + 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 ((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; +} |