1 /*
2 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
3 * 2005-2007 Takahiro Hirofuchi
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include <libudev.h>
20
21 #include <errno.h>
22 #include <stdio.h>
23 #include <string.h>
24
25 #include <getopt.h>
26
27 #include "usbip_common.h"
28 #include "utils.h"
29 #include "usbip.h"
30 #include "sysfs_utils.h"
31
32 static const char usbip_unbind_usage_string[] =
33 "usbip unbind <args>\n"
34 " -b, --busid=<busid> Unbind " USBIP_HOST_DRV_NAME ".ko from "
35 "device on <busid>\n";
36
usbip_unbind_usage(void)37 void usbip_unbind_usage(void)
38 {
39 printf("usage: %s", usbip_unbind_usage_string);
40 }
41
unbind_device(char * busid)42 static int unbind_device(char *busid)
43 {
44 char bus_type[] = "usb";
45 int rc, ret = -1;
46
47 char unbind_attr_name[] = "unbind";
48 char unbind_attr_path[SYSFS_PATH_MAX];
49 char rebind_attr_name[] = "rebind";
50 char rebind_attr_path[SYSFS_PATH_MAX];
51
52 struct udev *udev;
53 struct udev_device *dev;
54 const char *driver;
55
56 /* Create libudev context. */
57 udev = udev_new();
58
59 /* Check whether the device with this bus ID exists. */
60 dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
61 if (!dev) {
62 err("device with the specified bus ID does not exist");
63 goto err_close_udev;
64 }
65
66 /* Check whether the device is using usbip-host driver. */
67 driver = udev_device_get_driver(dev);
68 if (!driver || strcmp(driver, "usbip-host")) {
69 err("device is not bound to usbip-host driver");
70 goto err_close_udev;
71 }
72
73 /* Unbind device from driver. */
74 snprintf(unbind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s",
75 SYSFS_MNT_PATH, SYSFS_BUS_NAME, bus_type, SYSFS_DRIVERS_NAME,
76 USBIP_HOST_DRV_NAME, unbind_attr_name);
77
78 rc = write_sysfs_attribute(unbind_attr_path, busid, strlen(busid));
79 if (rc < 0) {
80 err("error unbinding device %s from driver", busid);
81 goto err_close_udev;
82 }
83
84 /* Notify driver of unbind. */
85 rc = modify_match_busid(busid, 0);
86 if (rc < 0) {
87 err("unable to unbind device on %s", busid);
88 goto err_close_udev;
89 }
90
91 /* Trigger new probing. */
92 snprintf(rebind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s",
93 SYSFS_MNT_PATH, SYSFS_BUS_NAME, bus_type, SYSFS_DRIVERS_NAME,
94 USBIP_HOST_DRV_NAME, rebind_attr_name);
95
96 rc = write_sysfs_attribute(rebind_attr_path, busid, strlen(busid));
97 if (rc < 0) {
98 err("error rebinding");
99 goto err_close_udev;
100 }
101
102 ret = 0;
103 info("unbind device on busid %s: complete", busid);
104
105 err_close_udev:
106 udev_device_unref(dev);
107 udev_unref(udev);
108
109 return ret;
110 }
111
usbip_unbind(int argc,char * argv[])112 int usbip_unbind(int argc, char *argv[])
113 {
114 static const struct option opts[] = {
115 { "busid", required_argument, NULL, 'b' },
116 { NULL, 0, NULL, 0 }
117 };
118
119 int opt;
120 int ret = -1;
121
122 for (;;) {
123 opt = getopt_long(argc, argv, "b:", opts, NULL);
124
125 if (opt == -1)
126 break;
127
128 switch (opt) {
129 case 'b':
130 ret = unbind_device(optarg);
131 goto out;
132 default:
133 goto err_out;
134 }
135 }
136
137 err_out:
138 usbip_unbind_usage();
139 out:
140 return ret;
141 }
142