85 lines
2.5 KiB
Diff
85 lines
2.5 KiB
Diff
--- a/drivers/usb/core/usb.c
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+++ b/drivers/usb/core/usb.c
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@@ -645,6 +645,71 @@ int __usb_get_extra_descriptor(char *buf
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}
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EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor);
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+static struct usb_device *match_device_name(struct usb_device *dev,
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+ const char *name)
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+{
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+ struct usb_device *ret_dev = NULL;
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+ int child;
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+
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+ dev_dbg(&dev->dev, "check for name %s ...\n", name);
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+
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+ /* see if this device matches */
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+ if (strcmp(dev_name(&dev->dev), name) == 0 ) {
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+ dev_dbg(&dev->dev, "matched this device!\n");
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+ ret_dev = usb_get_dev(dev);
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+ goto exit;
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+ }
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+
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+ /* look through all of the children of this device */
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+ for (child = 0; child < dev->maxchild; ++child) {
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+ if (dev->children[child]) {
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+ usb_lock_device(dev->children[child]);
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+ ret_dev = match_device_name(dev->children[child], name);
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+ usb_unlock_device(dev->children[child]);
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+ if (ret_dev)
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+ goto exit;
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+ }
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+ }
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+exit:
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+ return ret_dev;
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+}
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+
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+/**
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+ * usb_find_device_by_name - find a specific usb device in the system
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+ * @name: the name of the device to find
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+ *
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+ * Returns a pointer to a struct usb_device if such a specified usb
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+ * device is present in the system currently. The usage count of the
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+ * device will be incremented if a device is found. Make sure to call
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+ * usb_put_dev() when the caller is finished with the device.
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+ *
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+ * If a device with the specified bus id is not found, NULL is returned.
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+ */
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+struct usb_device *usb_find_device_by_name(const char *name)
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+{
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+ struct list_head *buslist;
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+ struct usb_bus *bus;
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+ struct usb_device *dev = NULL;
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+
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+ mutex_lock(&usb_bus_list_lock);
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+ for (buslist = usb_bus_list.next;
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+ buslist != &usb_bus_list;
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+ buslist = buslist->next) {
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+ bus = container_of(buslist, struct usb_bus, bus_list);
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+ if (!bus->root_hub)
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+ continue;
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+ usb_lock_device(bus->root_hub);
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+ dev = match_device_name(bus->root_hub, name);
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+ usb_unlock_device(bus->root_hub);
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+ if (dev)
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+ goto exit;
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+ }
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+exit:
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+ mutex_unlock(&usb_bus_list_lock);
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+ return dev;
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+}
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+EXPORT_SYMBOL_GPL(usb_find_device_by_name);
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+
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/**
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* usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
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* @dev: device the buffer will be used with
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--- a/include/linux/usb.h
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+++ b/include/linux/usb.h
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@@ -516,6 +516,7 @@ extern int usb_lock_device_for_reset(str
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extern int usb_reset_device(struct usb_device *dev);
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extern void usb_queue_reset_device(struct usb_interface *dev);
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+extern struct usb_device *usb_find_device_by_name(const char *name);
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/* USB autosuspend and autoresume */
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#ifdef CONFIG_USB_SUSPEND
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