85 lines
2.4 KiB
Diff
85 lines
2.4 KiB
Diff
--- a/drivers/usb/core/usb.c
|
|
+++ b/drivers/usb/core/usb.c
|
|
@@ -645,6 +645,71 @@ int __usb_get_extra_descriptor(char *buf
|
|
}
|
|
EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor);
|
|
|
|
+static struct usb_device *match_device_name(struct usb_device *dev,
|
|
+ const char *name)
|
|
+{
|
|
+ struct usb_device *ret_dev = NULL;
|
|
+ struct usb_device *childdev = NULL;
|
|
+ int child;
|
|
+
|
|
+ dev_dbg(&dev->dev, "check for name %s ...\n", name);
|
|
+
|
|
+ /* see if this device matches */
|
|
+ if (strcmp(dev_name(&dev->dev), name) == 0 ) {
|
|
+ dev_dbg(&dev->dev, "matched this device!\n");
|
|
+ ret_dev = usb_get_dev(dev);
|
|
+ goto exit;
|
|
+ }
|
|
+ /* look through all of the children of this device */
|
|
+ usb_hub_for_each_child(dev, child, childdev) {
|
|
+ if (childdev) {
|
|
+ usb_lock_device(childdev);
|
|
+ ret_dev = match_device_name(childdev, name);
|
|
+ usb_unlock_device(childdev);
|
|
+ if (ret_dev)
|
|
+ goto exit;
|
|
+ }
|
|
+ }
|
|
+exit:
|
|
+ return ret_dev;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * usb_find_device_by_name - find a specific usb device in the system
|
|
+ * @name: the name of the device to find
|
|
+ *
|
|
+ * Returns a pointer to a struct usb_device if such a specified usb
|
|
+ * device is present in the system currently. The usage count of the
|
|
+ * device will be incremented if a device is found. Make sure to call
|
|
+ * usb_put_dev() when the caller is finished with the device.
|
|
+ *
|
|
+ * If a device with the specified bus id is not found, NULL is returned.
|
|
+ */
|
|
+struct usb_device *usb_find_device_by_name(const char *name)
|
|
+{
|
|
+ struct list_head *buslist;
|
|
+ struct usb_bus *bus;
|
|
+ struct usb_device *dev = NULL;
|
|
+
|
|
+ mutex_lock(&usb_bus_list_lock);
|
|
+ for (buslist = usb_bus_list.next;
|
|
+ buslist != &usb_bus_list;
|
|
+ buslist = buslist->next) {
|
|
+ bus = container_of(buslist, struct usb_bus, bus_list);
|
|
+ if (!bus->root_hub)
|
|
+ continue;
|
|
+ usb_lock_device(bus->root_hub);
|
|
+ dev = match_device_name(bus->root_hub, name);
|
|
+ usb_unlock_device(bus->root_hub);
|
|
+ if (dev)
|
|
+ goto exit;
|
|
+ }
|
|
+exit:
|
|
+ mutex_unlock(&usb_bus_list_lock);
|
|
+ return dev;
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(usb_find_device_by_name);
|
|
+
|
|
/**
|
|
* usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
|
|
* @dev: device the buffer will be used with
|
|
--- a/include/linux/usb.h
|
|
+++ b/include/linux/usb.h
|
|
@@ -675,6 +675,7 @@ static inline bool usb_device_supports_l
|
|
return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT;
|
|
}
|
|
|
|
+extern struct usb_device *usb_find_device_by_name(const char *name);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|