diff options
Diffstat (limited to 'drivers/staging/usbip/userspace/src/usbip_bind.c')
-rw-r--r-- | drivers/staging/usbip/userspace/src/usbip_bind.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/drivers/staging/usbip/userspace/src/usbip_bind.c b/drivers/staging/usbip/userspace/src/usbip_bind.c new file mode 100644 index 0000000..9ecaf6e --- /dev/null +++ b/drivers/staging/usbip/userspace/src/usbip_bind.c @@ -0,0 +1,277 @@ +/* + * 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 <stdlib.h> +#include <string.h> + +#include <getopt.h> + +#include "usbip_common.h" +#include "utils.h" +#include "usbip.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 bus_type[] = "usb"; + char attr_name[] = "bind"; + char sysfs_mntpath[SYSFS_PATH_MAX]; + char bind_attr_path[SYSFS_PATH_MAX]; + char intf_busid[SYSFS_BUS_ID_SIZE]; + struct sysfs_device *busid_dev; + struct sysfs_attribute *bind_attr; + struct sysfs_attribute *bConfValue; + struct sysfs_attribute *bNumIntfs; + int i, failed = 0; + int rc, ret = -1; + + rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX); + if (rc < 0) { + err("sysfs must be mounted: %s", strerror(errno)); + return -1; + } + + snprintf(bind_attr_path, sizeof(bind_attr_path), "%s/%s/%s/%s/%s/%s", + sysfs_mntpath, SYSFS_BUS_NAME, bus_type, SYSFS_DRIVERS_NAME, + USBIP_HOST_DRV_NAME, attr_name); + + bind_attr = sysfs_open_attribute(bind_attr_path); + if (!bind_attr) { + dbg("problem getting bind attribute: %s", strerror(errno)); + return -1; + } + + busid_dev = sysfs_open_device(bus_type, busid); + if (!busid_dev) { + dbg("sysfs_open_device %s failed: %s", busid, strerror(errno)); + goto err_close_bind_attr; + } + + bConfValue = sysfs_get_device_attr(busid_dev, "bConfigurationValue"); + bNumIntfs = sysfs_get_device_attr(busid_dev, "bNumInterfaces"); + + if (!bConfValue || !bNumIntfs) { + dbg("problem getting device attributes: %s", + strerror(errno)); + goto err_close_busid_dev; + } + + for (i = 0; i < atoi(bNumIntfs->value); i++) { + snprintf(intf_busid, SYSFS_BUS_ID_SIZE, "%s:%.1s.%d", busid, + bConfValue->value, i); + + rc = sysfs_write_attribute(bind_attr, intf_busid, + SYSFS_BUS_ID_SIZE); + if (rc < 0) { + dbg("bind driver at %s failed", intf_busid); + failed = 1; + } + } + + if (!failed) + ret = 0; + +err_close_busid_dev: + sysfs_close_device(busid_dev); +err_close_bind_attr: + sysfs_close_attribute(bind_attr); + + return ret; +} + +/* buggy driver may cause dead lock */ +static int unbind_other(char *busid) +{ + char bus_type[] = "usb"; + char intf_busid[SYSFS_BUS_ID_SIZE]; + struct sysfs_device *busid_dev; + struct sysfs_device *intf_dev; + struct sysfs_driver *intf_drv; + struct sysfs_attribute *unbind_attr; + struct sysfs_attribute *bConfValue; + struct sysfs_attribute *bDevClass; + struct sysfs_attribute *bNumIntfs; + int i, rc; + enum unbind_status status = UNBIND_ST_OK; + + busid_dev = sysfs_open_device(bus_type, busid); + if (!busid_dev) { + dbg("sysfs_open_device %s failed: %s", busid, strerror(errno)); + return -1; + } + + bConfValue = sysfs_get_device_attr(busid_dev, "bConfigurationValue"); + bDevClass = sysfs_get_device_attr(busid_dev, "bDeviceClass"); + bNumIntfs = sysfs_get_device_attr(busid_dev, "bNumInterfaces"); + if (!bConfValue || !bDevClass || !bNumIntfs) { + dbg("problem getting device attributes: %s", + strerror(errno)); + goto err_close_busid_dev; + } + + if (!strncmp(bDevClass->value, "09", bDevClass->len)) { + dbg("skip unbinding of hub"); + goto err_close_busid_dev; + } + + for (i = 0; i < atoi(bNumIntfs->value); i++) { + snprintf(intf_busid, SYSFS_BUS_ID_SIZE, "%s:%.1s.%d", busid, + bConfValue->value, i); + intf_dev = sysfs_open_device(bus_type, intf_busid); + if (!intf_dev) { + dbg("could not open interface device: %s", + strerror(errno)); + goto err_close_busid_dev; + } + + dbg("%s -> %s", intf_dev->name, intf_dev->driver_name); + + if (!strncmp("unknown", intf_dev->driver_name, SYSFS_NAME_LEN)) + /* unbound interface */ + continue; + + if (!strncmp(USBIP_HOST_DRV_NAME, intf_dev->driver_name, + SYSFS_NAME_LEN)) { + /* already bound to usbip-host */ + status = UNBIND_ST_USBIP_HOST; + continue; + } + + /* unbinding */ + intf_drv = sysfs_open_driver(bus_type, intf_dev->driver_name); + if (!intf_drv) { + dbg("could not open interface driver on %s: %s", + intf_dev->name, strerror(errno)); + goto err_close_intf_dev; + } + + unbind_attr = sysfs_get_driver_attr(intf_drv, "unbind"); + if (!unbind_attr) { + dbg("problem getting interface driver attribute: %s", + strerror(errno)); + goto err_close_intf_drv; + } + + rc = sysfs_write_attribute(unbind_attr, intf_dev->bus_id, + SYSFS_BUS_ID_SIZE); + if (rc < 0) { + /* NOTE: why keep unbinding other interfaces? */ + dbg("unbind driver at %s failed", intf_dev->bus_id); + status = UNBIND_ST_FAILED; + } + + sysfs_close_driver(intf_drv); + sysfs_close_device(intf_dev); + } + + goto out; + +err_close_intf_drv: + sysfs_close_driver(intf_drv); +err_close_intf_dev: + sysfs_close_device(intf_dev); +err_close_busid_dev: + status = UNBIND_ST_FAILED; +out: + sysfs_close_device(busid_dev); + + return status; +} + +static int bind_device(char *busid) +{ + int rc; + + 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; + } + + printf("bind device on busid %s: complete\n", 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; +} |