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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
* 2005-2007 Takahiro Hirofuchi
*/
#include <libudev.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include "usbip_common.h"
#include "utils.h"
#include "usbip.h"
#include "sysfs_utils.h"
static const char usbip_unbind_usage_string[] =
"usbip unbind <args>\n"
" -b, --busid=<busid> Unbind " USBIP_HOST_DRV_NAME ".ko from "
"device on <busid>\n";
void usbip_unbind_usage(void)
{
printf("usage: %s", usbip_unbind_usage_string);
}
static int unbind_device(char *busid)
{
char bus_type[] = "usb";
int rc, ret = -1;
char unbind_attr_name[] = "unbind";
char unbind_attr_path[SYSFS_PATH_MAX];
char rebind_attr_name[] = "rebind";
char rebind_attr_path[SYSFS_PATH_MAX];
struct udev *udev;
struct udev_device *dev;
const char *driver;
/* Create libudev context. */
udev = udev_new();
/* Check whether the device with this bus ID exists. */
dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
if (!dev) {
err("device with the specified bus ID does not exist");
goto err_close_udev;
}
/* Check whether the device is using usbip-host driver. */
driver = udev_device_get_driver(dev);
if (!driver || strcmp(driver, "usbip-host")) {
err("device is not bound to usbip-host driver");
goto err_close_udev;
}
/* Unbind device from driver. */
snprintf(unbind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s",
SYSFS_MNT_PATH, SYSFS_BUS_NAME, bus_type, SYSFS_DRIVERS_NAME,
USBIP_HOST_DRV_NAME, unbind_attr_name);
rc = write_sysfs_attribute(unbind_attr_path, busid, strlen(busid));
if (rc < 0) {
err("error unbinding device %s from driver", busid);
goto err_close_udev;
}
/* Notify driver of unbind. */
rc = modify_match_busid(busid, 0);
if (rc < 0) {
err("unable to unbind device on %s", busid);
goto err_close_udev;
}
/* Trigger new probing. */
snprintf(rebind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s",
SYSFS_MNT_PATH, SYSFS_BUS_NAME, bus_type, SYSFS_DRIVERS_NAME,
USBIP_HOST_DRV_NAME, rebind_attr_name);
rc = write_sysfs_attribute(rebind_attr_path, busid, strlen(busid));
if (rc < 0) {
err("error rebinding");
goto err_close_udev;
}
ret = 0;
info("unbind device on busid %s: complete", busid);
err_close_udev:
udev_device_unref(dev);
udev_unref(udev);
return ret;
}
int usbip_unbind(int argc, char *argv[])
{
static const struct option opts[] = {
{ "busid", required_argument, NULL, 'b' },
{ NULL, 0, NULL, 0 }
};
int opt;
int ret = -1;
for (;;) {
opt = getopt_long(argc, argv, "b:", opts, NULL);
if (opt == -1)
break;
switch (opt) {
case 'b':
ret = unbind_device(optarg);
goto out;
default:
goto err_out;
}
}
err_out:
usbip_unbind_usage();
out:
return ret;
}
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