static int use_device_by_usbip(char *busid)
{
int ret;
ret = unbind(busid);
if (ret < 0) {
g_warning("unbind drivers of %s, failed", busid);
return -1;
}
ret = modify_match_busid(busid, 1);
if (ret < 0) {
g_warning("add %s to match_busid, failed", busid);
return -1;
}
ret = bind_to_usbip(busid);
if (ret < 0) {
g_warning("bind usbip to %s, failed", busid);
modify_match_busid(busid, 0);
return -1;
}
g_message("bind %s to usbip, complete!", busid);
return 0;
}
static int use_device_by_other(char *busid)
{
int ret;
int config;
/* read and write the same config value to kick probing */
config = read_bConfigurationValue(busid);
if (config < 0) {
g_warning("read bConfigurationValue of %s, failed", busid);
return -1;
}
ret = modify_match_busid(busid, 0);
if (ret < 0) {
g_warning("del %s to match_busid, failed", busid);
return -1;
}
ret = write_bConfigurationValue(busid, config);
if (ret < 0) {
g_warning("read bConfigurationValue of %s, failed", busid);
return -1;
}
g_message("bind %s to other drivers than usbip, complete!", busid);
return 0;
}
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;
}
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;
}
