diff mbox series

[V5,2/9] usb: roles: add API to get usb_role_switch by node

Message ID 1556097743-12717-3-git-send-email-biju.das@bp.renesas.com (mailing list archive)
State New, archived
Headers show
Series None | expand

Commit Message

Biju Das April 24, 2019, 9:22 a.m. UTC 
From: Chunfeng Yun <chunfeng.yun@mediatek.com>

Add fwnode_usb_role_switch_get() to make easier to get
usb_role_switch by fwnode which register it.
It's useful when there is not device_connection registered
between two drivers and only knows the fwnode which register
usb_role_switch.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
---
 * Rebased on top of patch1 in this series. Incorporated Heikki's review comments
   (https://patchwork.kernel.org/patch/10882555/)

 Note:- This patch is added to this series to avoid compilation issues.
---
 drivers/usb/roles/class.c | 25 +++++++++++++++++++++++++
 include/linux/usb/role.h  |  8 ++++++++
 2 files changed, 33 insertions(+)
diff mbox series

Patch

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index f45d8df..a0847a8 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -136,6 +136,31 @@  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 by it's parent fwnode
+ * @fwnode: The fwnode that register USB role switch
+ *
+ * Finds and returns role switch registered by @fwnode. The reference count
+ * for the found switch is incremented.
+ */
+struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
+{
+	struct usb_role_switch *sw;
+	struct device *dev;
+
+	dev = class_find_device(role_class, NULL, fwnode,
+				switch_fwnode_match);
+	if (!dev)
+		return ERR_PTR(-EPROBE_DEFER);
+
+	sw = to_role_switch(dev);
+	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..0f6e2829 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -47,6 +47,8 @@  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 *fwnode);
 void usb_role_switch_put(struct usb_role_switch *sw);
 
 struct usb_role_switch *
@@ -70,6 +72,12 @@  static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
 	return ERR_PTR(-ENODEV);
 }
 
+struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
 
 static inline struct usb_role_switch *