From: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> 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@xxxxxxxxxxxx> Signed-off-by: Biju Das <biju.das@xxxxxxxxxxxxxx> --- * 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 --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 * -- 2.7.4
