[PATCH 4/6] usb: usbip tool: Add ncontrollers in vhci_driver structure

[Yuyang Du <yuyang.du@xxxxxxxxx>]

This field is read from the newly added ncontroller sysfs.

Signed-off-by: Yuyang Du <yuyang.du@xxxxxxxxx>
---
 tools/usb/usbip/libsrc/vhci_driver.c | 18 +++++++++++++++++-
 tools/usb/usbip/libsrc/vhci_driver.h |  1 +
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/tools/usb/usbip/libsrc/vhci_driver.c b/tools/usb/usbip/libsrc/vhci_driver.c
index 4228b98..d335f04 100644
--- a/tools/usb/usbip/libsrc/vhci_driver.c
+++ b/tools/usb/usbip/libsrc/vhci_driver.c
@@ -134,6 +134,20 @@ static int get_nports(void)
 	return strtoul(attr_nports, NULL, 10);
 }
 
+static int get_ncontrollers(void)
+{
+	const char *attr_ncontrollers;
+
+	attr_ncontrollers = udev_device_get_sysattr_value(vhci_driver->hc_device,
+							  "ncontrollers");
+	if (!attr_ncontrollers) {
+		err("udev_device_get_sysattr_value ncontrollers failed");
+		return -1;
+	}
+
+	return strtoul(attr_ncontrollers, NULL, 10);
+}
+
 /*
  * Read the given port's record.
  *
@@ -220,9 +234,11 @@ int usbip_vhci_driver_open(void)
 	}
 
 	vhci_driver->nports = get_nports();
-
 	dbg("available ports: %d", vhci_driver->nports);
 
+	vhci_driver->ncontrollers = get_ncontrollers();
+	dbg("available controllers: %d", vhci_driver->ncontrollers);
+
 	if (refresh_imported_device_list())
 		goto err;
 
diff --git a/tools/usb/usbip/libsrc/vhci_driver.h b/tools/usb/usbip/libsrc/vhci_driver.h
index fa2316c..33add14 100644
--- a/tools/usb/usbip/libsrc/vhci_driver.h
+++ b/tools/usb/usbip/libsrc/vhci_driver.h
@@ -31,6 +31,7 @@ struct usbip_vhci_driver {
 	/* /sys/devices/platform/vhci_hcd */
 	struct udev_device *hc_device;
 
+	int ncontrollers;
 	int nports;
 	struct usbip_imported_device idev[MAXNPORT];
 };
-- 
1.9.1

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