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author | Ingo Molnar <mingo@kernel.org> | 2014-09-09 06:48:07 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-09-09 06:48:07 +0200 |
commit | bdea534db894ea19320f470ce2e63b1d9de96a15 (patch) | |
tree | 8ec2a0a93d9bb5e7205253c67aa624b9ec227477 /tools/usb/usbip/src/usbip_unbind.c | |
parent | 39b5a56ec0be5effe9b7d0f18cb27724bf2e5d47 (diff) | |
parent | 2ce7598c9a453e0acd0e07be7be3f5eb39608ebd (diff) | |
download | op-kernel-dev-bdea534db894ea19320f470ce2e63b1d9de96a15.zip op-kernel-dev-bdea534db894ea19320f470ce2e63b1d9de96a15.tar.gz |
Merge tag 'v3.17-rc4' into perf/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/usb/usbip/src/usbip_unbind.c')
-rw-r--r-- | tools/usb/usbip/src/usbip_unbind.c | 141 |
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 0000000..a4a496c --- /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; +} |