diff options
Diffstat (limited to 'drivers/staging/usbip/userspace/src/usbip_unbind.c')
| -rw-r--r-- | drivers/staging/usbip/userspace/src/usbip_unbind.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/staging/usbip/userspace/src/usbip_unbind.c b/drivers/staging/usbip/userspace/src/usbip_unbind.c new file mode 100644 index 000000000000..d5a9ab6af2a6 --- /dev/null +++ b/drivers/staging/usbip/userspace/src/usbip_unbind.c @@ -0,0 +1,186 @@ +/* + * 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 <sysfs/libsysfs.h> + +#include <errno.h> +#include <stdio.h> +#include <string.h> + +#include <getopt.h> + +#include "usbip_common.h" +#include "utils.h" +#include "usbip.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"; + struct sysfs_driver *usbip_host_drv; + struct sysfs_device *dev; + struct dlist *devlist; + int verified = 0; + int rc, ret = -1; + + char attr_name[] = "bConfigurationValue"; + char sysfs_mntpath[SYSFS_PATH_MAX]; + char busid_attr_path[SYSFS_PATH_MAX]; + struct sysfs_attribute *busid_attr; + char *val = NULL; + int len; + + /* verify the busid device is using usbip-host */ + usbip_host_drv = sysfs_open_driver(bus_type, USBIP_HOST_DRV_NAME); + if (!usbip_host_drv) { + err("could not open %s driver: %s", USBIP_HOST_DRV_NAME, + strerror(errno)); + return -1; + } + + devlist = sysfs_get_driver_devices(usbip_host_drv); + if (!devlist) { + err("%s is not in use by any devices", USBIP_HOST_DRV_NAME); + goto err_close_usbip_host_drv; + } + + dlist_for_each_data(devlist, dev, struct sysfs_device) { + if (!strncmp(busid, dev->name, strlen(busid)) && + !strncmp(dev->driver_name, USBIP_HOST_DRV_NAME, + strlen(USBIP_HOST_DRV_NAME))) { + verified = 1; + break; + } + } + + if (!verified) { + err("device on busid %s is not using %s", busid, + USBIP_HOST_DRV_NAME); + goto err_close_usbip_host_drv; + } + + /* + * NOTE: A read and write of an attribute value of the device busid + * refers to must be done to start probing. That way a rebind of the + * default driver for the device occurs. + * + * This seems very hackish and adds a lot of pointless code. I think it + * should be done in the kernel by the driver after del_match_busid is + * finished! + */ + + rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX); + if (rc < 0) { + err("sysfs must be mounted: %s", strerror(errno)); + return -1; + } + + snprintf(busid_attr_path, sizeof(busid_attr_path), "%s/%s/%s/%s/%s/%s", + sysfs_mntpath, SYSFS_BUS_NAME, bus_type, SYSFS_DEVICES_NAME, + busid, attr_name); + + /* read a device attribute */ + busid_attr = sysfs_open_attribute(busid_attr_path); + if (!busid_attr) { + err("could not open %s/%s: %s", busid, attr_name, + strerror(errno)); + return -1; + } + + if (sysfs_read_attribute(busid_attr) < 0) { + err("problem reading attribute: %s", strerror(errno)); + goto err_out; + } + + len = busid_attr->len; + val = malloc(len); + *val = *busid_attr->value; + sysfs_close_attribute(busid_attr); + + /* notify driver of unbind */ + rc = modify_match_busid(busid, 0); + if (rc < 0) { + err("unable to unbind device on %s", busid); + goto err_out; + } + + /* write the device attribute */ + busid_attr = sysfs_open_attribute(busid_attr_path); + if (!busid_attr) { + err("could not open %s/%s: %s", busid, attr_name, + strerror(errno)); + return -1; + } + + rc = sysfs_write_attribute(busid_attr, val, len); + if (rc < 0) { + err("problem writing attribute: %s", strerror(errno)); + goto err_out; + } + sysfs_close_attribute(busid_attr); + + ret = 0; + printf("unbind device on busid %s: complete\n", busid); + +err_out: + free(val); +err_close_usbip_host_drv: + sysfs_close_driver(usbip_host_drv); + + 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; +} |