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usb: roles: Add usb_role_switch_find_by_fwnode()

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

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20191008122600.22340-2-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2019-10-08 15:25:59 +03:00 committed by Greg Kroah-Hartman
parent 16c8373ecf
commit c6919d5e0c
2 changed files with 24 additions and 0 deletions
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21
drivers/usb/roles/class.c
View File

@ -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)
{

3
include/linux/usb/role.h
View File

@ -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);