1 files changed, 141 insertions, 0 deletions

diff --git a/tools/usb/usbip/src/usbip_unbind.c b/tools/usb/usbip/src/usbip_unbind.c
new file mode 100644
index 000000000000..a4a496c9cbaf
--- /dev/null
+++ b/tools/usb/usbip/src/usbip_unbind.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
+ *               2005-2007 Takahiro Hirofuchi
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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;
+}