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usb: roles: Add fwnode_usb_role_switch_get() function 

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@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2019-08-29 17:22:34 +08:00 committed by Greg Kroah-Hartman
parent 44493062ab
commit a31f01777b
2 changed files with 27 additions and 0 deletions
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20
drivers/usb/roles/class.c
View File

@ -135,6 +135,26 @@ 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

7
include/linux/usb/role.h
View File

@ -47,6 +47,7 @@ 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 *
@ -70,6 +71,12 @@ 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 *