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 000000000000..9ecaf6e574df
--- /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;
+}