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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 <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;
}
|
