linux-kernel - [RFC PATCH 3/5] usb: roles: Find the muxes by also matching against the device node

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Message-Id: <20181024150525.11552-4-heikki.krogerus@linux.intel.com>
Date:   Wed, 24 Oct 2018 18:05:23 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 3/5] usb: roles: Find the muxes by also matching against the device node

When the connections are defined in firmware, struct
device_connection will have the fwnode member pointing to
the device node (struct fwnode_handle) of the requested
device, and the endpoint will not be used at all in that
case.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/usb/common/roles.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/common/roles.c b/drivers/usb/common/roles.c
index 99116af07f1d..bb52e006d203 100644
--- a/drivers/usb/common/roles.c
+++ b/drivers/usb/common/roles.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/usb/role.h>
+#include <linux/property.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
@@ -84,7 +85,12 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
 
-static int __switch_match(struct device *dev, const void *name)
+static int switch_fwnode_match(struct device *dev, const void *fwnode)
+{
+	return dev_fwnode(dev) == fwnode;
+}
+
+static int switch_name_match(struct device *dev, const void *name)
 {
 	return !strcmp((const char *)name, dev_name(dev));
 }
@@ -94,8 +100,12 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
 {
 	struct device *dev;
 
-	dev = class_find_device(role_class, NULL, con->endpoint[ep],
-				__switch_match);
+	if (con->fwnode)
+		dev = class_find_device(role_class, NULL, con->fwnode,
+					switch_fwnode_match);
+	else
+		dev = class_find_device(role_class, NULL, con->endpoint[ep],
+					switch_name_match);
 
 	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
 }
-- 
2.19.1