diff options
Diffstat (limited to 'tools/usb/usbip/src/usbip_bind.c')
| -rw-r--r-- | tools/usb/usbip/src/usbip_bind.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/tools/usb/usbip/src/usbip_bind.c b/tools/usb/usbip/src/usbip_bind.c new file mode 100644 index 000000000..f1cf9225a --- /dev/null +++ b/tools/usb/usbip/src/usbip_bind.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2011 matt mooney <mfm@muteddisk.com> + * 2005-2007 Takahiro Hirofuchi + */ + +#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; + const char *devpath; + + /* 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; + } + devpath = udev_device_get_devpath(dev); + udev_unref(udev); + + /* If the device is already attached to vhci_hcd - bail out */ + if (strstr(devpath, USBIP_VHCI_DRV_NAME)) { + err("bind loop detected: device: %s is attached to %s\n", + devpath, USBIP_VHCI_DRV_NAME); + return -1; + } + + 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; +} |