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@xxxxxxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/usb.c | 46 ++++++++++++++++++++++++++++++++++++++++++
include/linux/usb.h | 9 +++++++++
2 files changed, 55 insertions(+)
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 2ce3667ec6fae..62368c4ed37af 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -398,6 +398,52 @@ 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 usb_device *hdev, void *data)
+{
+ struct each_hub_arg *arg = (struct each_hub_arg *)data;
+ struct usb_hub *hub;
+ int ret = 0;
+ int i;
+
+ hub = usb_hub_to_struct_hub(hdev);
+ if (!hub)
+ return 0;
+
+ mutex_lock(&usb_port_peer_mutex);
+
+ for (i = 0; i < hdev->maxchild; i++) {
+ ret = arg->fn(&hub->ports[i]->dev, arg->data);
+ if (ret)
+ break;
+ }
+
+ mutex_unlock(&usb_port_peer_mutex);
+
+ return ret;
+}
+
+/**
+ * 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 usb_for_each_dev(&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
diff --git a/include/linux/usb.h b/include/linux/usb.h
index ddd2f5b2a2827..eaae24217e8a2 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -882,6 +882,15 @@ extern struct usb_host_interface *usb_find_alt_setting(
unsigned int iface_num,
unsigned int alt_num);
+#if IS_REACHABLE(CONFIG_USB)
+int usb_for_each_port(void *data, int (*fn)(struct device *, void *));
+#else
+static inline int usb_for_each_port(void *data, int (*fn)(struct device *, void *))
+{
+ return 0;
+}
+#endif
+
/* port claiming functions */
int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
struct usb_dev_state *owner);
--
2.30.2
