@@ -398,6 +398,49 @@ int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *))
}
EXPORT_SYMBOL_GPL(usb_for_each_dev);
+struct each_hub_arg {
+ void *data;
+ int (*fn)(struct device *, void *);
+};
+
+static int __each_hub(struct device *dev, void *data)
+{
+ struct each_hub_arg *arg = (struct each_hub_arg *)data;
+ struct usb_device *hdev = to_usb_device(dev);
+ struct usb_hub *hub;
+ int ret;
+ int i;
+
+ hub = usb_hub_to_struct_hub(hdev);
+ if (!hub)
+ return 0;
+
+ for (i = 0; i < hdev->maxchild; i++) {
+ ret = arg->fn(&hub->ports[i]->dev, arg->data);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * usb_for_each_port - interate over all USB ports in the system
+ * @data: data pointer that will be handed to the callback function
+ * @fn: callback function to be called for each USB port
+ *
+ * Iterate over all USB ports and call @fn for each, passing it @data. If it
+ * returns anything other than 0, we break the iteration prematurely and return
+ * that value.
+ */
+int usb_for_each_port(void *data, int (*fn)(struct device *, void *))
+{
+ struct each_hub_arg arg = {data, fn};
+
+ return bus_for_each_dev(&usb_bus_type, NULL, &arg, __each_hub);
+}
+EXPORT_SYMBOL_GPL(usb_for_each_port);
+
/**
* usb_release_dev - free a usb device structure when all users of it are finished.
* @dev: device that's been disconnected
@@ -869,6 +869,7 @@ extern int usb_match_one_id(struct usb_interface *interface,
const struct usb_device_id *id);
extern int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *));
+int usb_for_each_port(void *data, int (*fn)(struct device *, void *));
extern struct usb_interface *usb_find_interface(struct usb_driver *drv,
int minor);
extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev,
Introducing usb_for_each_port(). It works the same way as usb_for_each_dev(), but instead of going through every USB device in the system, it walks through the USB ports in the system. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> --- drivers/usb/core/usb.c | 43 ++++++++++++++++++++++++++++++++++++++++++ include/linux/usb.h | 1 + 2 files changed, 44 insertions(+)