[cip-dev] [PATCH 4.19.y-cip 12/23] usb: roles: Add fwnode_usb_role_switch_get() function - Marian-Cristian Rotariu

From: marian-cristian.rotariu.rb@bp.renesas.com (Marian-Cristian Rotariu)
To: cip-dev@lists.cip-project.org
Subject: [cip-dev] [PATCH 4.19.y-cip 12/23] usb: roles: Add fwnode_usb_role_switch_get() function
Date: Tue, 18 Feb 2020 14:05:09 +0000	[thread overview]
Message-ID: <1582034720-5249-13-git-send-email-marian-cristian.rotariu.rb@bp.renesas.com> (raw)
In-Reply-To: <1582034720-5249-1-git-send-email-marian-cristian.rotariu.rb@bp.renesas.com>

From: Heikki Krogerus <heikki.krogerus@linux.intel.com>

commit a31f01777bc54a0a9d57628956d05f8d454d3418 upstream.

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 at mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
---
 drivers/usb/roles/class.c | 20 ++++++++++++++++++++
 include/linux/usb/role.h  |  7 +++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 6b3c087..a4e498e 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 b880e6a..8029d1b 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -46,6 +46,7 @@ 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 *
@@ -69,6 +70,12 @@ 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 *
-- 
2.7.4
