usb: roles: Add fwnode_usb_role_switch_get() function
The fwnode_usb_role_switch_get() function is exactly the
same as usb_role_switch_get(), except that it takes struct
fwnode_handle as parameter instead of struct device.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Tested-by: Biju Das <biju.das@bp.renesas.com>
Link: https://lore.kernel.org/r/1567070558-29417-8-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 86defca..5b637aa 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -136,6 +136,26 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev)
EXPORT_SYMBOL_GPL(usb_role_switch_get);
/**
+ * fwnode_usb_role_switch_get - Find USB role switch linked with the caller
+ * @fwnode: The caller device node
+ *
+ * This is similar to the usb_role_switch_get() function above, but it searches
+ * the switch using fwnode instead of device entry.
+ */
+struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
+{
+ struct usb_role_switch *sw;
+
+ sw = fwnode_connection_find_match(fwnode, "usb-role-switch", NULL,
+ usb_role_switch_match);
+ if (!IS_ERR_OR_NULL(sw))
+ WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
+
+ return sw;
+}
+EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
+
+/**
* usb_role_switch_put - Release handle to a switch
* @sw: USB Role Switch
*
diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index da2b964..2d77f97 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -47,6 +47,7 @@ struct usb_role_switch_desc {
int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
struct usb_role_switch *usb_role_switch_get(struct device *dev);
+struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *node);
void usb_role_switch_put(struct usb_role_switch *sw);
struct usb_role_switch *
@@ -70,6 +71,12 @@ static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
return ERR_PTR(-ENODEV);
}
+static inline struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *node)
+{
+ return ERR_PTR(-ENODEV);
+}
+
static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
static inline struct usb_role_switch *