linux-kernel - [PATCH v2 1/2] usb: roles: Add usb_role_switch_find_by

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue,  8 Oct 2019 15:25:59 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH v2 1/2] usb: roles: Add usb_role_switch_find_by_fwnode()

Simple wrapper function that searches USB role switches with
class_find_device_by_fwnode().

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/usb/roles/class.c | 21 +++++++++++++++++++++
 include/linux/usb/role.h  |  3 +++
 2 files changed, 24 insertions(+)

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 94b4e7db2b94..8273126ffdf4 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -175,6 +175,27 @@ void usb_role_switch_put(struct usb_role_switch *sw)
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_put);
 
+/**
+ * usb_role_switch_find_by_fwnode - Find USB role switch with its fwnode
+ * @fwnode: fwnode of the USB Role Switch
+ *
+ * Finds and returns role switch with @fwnode. The reference count for the
+ * found switch is incremented.
+ */
+struct usb_role_switch *
+usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
+{
+	struct device *dev;
+
+	if (!fwnode)
+		return NULL;
+
+	dev = class_find_device_by_fwnode(role_class, fwnode);
+
+	return dev ? to_role_switch(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(usb_role_switch_find_by_fwnode);
+
 static umode_t
 usb_role_switch_is_visible(struct kobject *kobj, struct attribute *attr, int n)
 {
diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index 2d77f97df72d..efac3af83d6b 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -50,6 +50,9 @@ 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 *
+usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode);
+
 struct usb_role_switch *
 usb_role_switch_register(struct device *parent,
 			 const struct usb_role_switch_desc *desc);
-- 
2.23.0