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