--- /dev/null
+/*
+ * 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 <stdlib.h>
+#include <string.h>
+
+#include <getopt.h>
+
+#include "usbip_common.h"
+#include "utils.h"
+#include "usbip.h"
+#include "sysfs_utils.h"
+
+enum unbind_status {
+ UNBIND_ST_OK,
+ UNBIND_ST_USBIP_HOST,
+ UNBIND_ST_FAILED
+};
+
+static const char usbip_bind_usage_string[] =
+ "usbip bind <args>\n"
+ " -b, --busid=<busid> Bind " USBIP_HOST_DRV_NAME ".ko to device "
+ "on <busid>\n";
+
+void usbip_bind_usage(void)
+{
+ printf("usage: %s", usbip_bind_usage_string);
+}
+
+/* call at unbound state */
+static int bind_usbip(char *busid)
+{
+ char attr_name[] = "bind";
+ char bind_attr_path[SYSFS_PATH_MAX];
+ int rc = -1;
+
+ snprintf(bind_attr_path, sizeof(bind_attr_path), "%s/%s/%s/%s/%s/%s",
+ SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE,
+ SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name);
+
+ rc = write_sysfs_attribute(bind_attr_path, busid, strlen(busid));
+ if (rc < 0) {
+ err("error binding device %s to driver: %s", busid,
+ strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+/* buggy driver may cause dead lock */
+static int unbind_other(char *busid)
+{
+ enum unbind_status status = UNBIND_ST_OK;
+
+ char attr_name[] = "unbind";
+ char unbind_attr_path[SYSFS_PATH_MAX];
+ int rc = -1;
+
+ struct udev *udev;
+ struct udev_device *dev;
+ const char *driver;
+ const char *bDevClass;
+
+ /* Create libudev context. */
+ udev = udev_new();
+
+ /* Get the device. */
+ dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
+ if (!dev) {
+ dbg("unable to find device with bus ID %s", busid);
+ goto err_close_busid_dev;
+ }
+
+ /* Check what kind of device it is. */
+ bDevClass = udev_device_get_sysattr_value(dev, "bDeviceClass");
+ if (!bDevClass) {
+ dbg("unable to get bDevClass device attribute");
+ goto err_close_busid_dev;
+ }
+
+ if (!strncmp(bDevClass, "09", strlen(bDevClass))) {
+ dbg("skip unbinding of hub");
+ goto err_close_busid_dev;
+ }
+
+ /* Get the device driver. */
+ driver = udev_device_get_driver(dev);
+ if (!driver) {
+ /* No driver bound to this device. */
+ goto out;
+ }
+
+ if (!strncmp(USBIP_HOST_DRV_NAME, driver,
+ strlen(USBIP_HOST_DRV_NAME))) {
+ /* Already bound to usbip-host. */
+ status = UNBIND_ST_USBIP_HOST;
+ goto out;
+ }
+
+ /* Unbind device from driver. */
+ snprintf(unbind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s",
+ SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE,
+ SYSFS_DRIVERS_NAME, driver, 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_busid_dev;
+ }
+
+ goto out;
+
+err_close_busid_dev:
+ status = UNBIND_ST_FAILED;
+out:
+ udev_device_unref(dev);
+ udev_unref(udev);
+
+ return status;
+}
+
+static int bind_device(char *busid)
+{
+ int rc;
+ struct udev *udev;
+ struct udev_device *dev;
+
+ /* Check whether the device with this bus ID exists. */
+ udev = udev_new();
+ dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
+ if (!dev) {
+ err("device with the specified bus ID does not exist");
+ return -1;
+ }
+ udev_unref(udev);
+
+ rc = unbind_other(busid);
+ if (rc == UNBIND_ST_FAILED) {
+ err("could not unbind driver from device on busid %s", busid);
+ return -1;
+ } else if (rc == UNBIND_ST_USBIP_HOST) {
+ err("device on busid %s is already bound to %s", busid,
+ USBIP_HOST_DRV_NAME);
+ return -1;
+ }
+
+ rc = modify_match_busid(busid, 1);
+ if (rc < 0) {
+ err("unable to bind device on %s", busid);
+ return -1;
+ }
+
+ rc = bind_usbip(busid);
+ if (rc < 0) {
+ err("could not bind device to %s", USBIP_HOST_DRV_NAME);
+ modify_match_busid(busid, 0);
+ return -1;
+ }
+
+ info("bind device on busid %s: complete", busid);
+
+ return 0;
+}
+
+int usbip_bind(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 = bind_device(optarg);
+ goto out;
+ default:
+ goto err_out;
+ }
+ }
+
+err_out:
+ usbip_bind_usage();
+out:
+ return ret;
+}
Code Review / kvmfornfv.git / blobdiff