diff options
| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2019-10-08 15:25:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-04 17:05:25 +0300 |
| commit | c6919d5e0cd168a732034d8dc19fdc3dff683a2b (patch) | |
| tree | 5136c2316bb3fcfd0bdbf677d99e6818b47ce016 | |
| parent | 16c8373ecf7b3c723a8e765d798ea413bc8345a6 (diff) | |
| download | linux-c6919d5e0cd168a732034d8dc19fdc3dff683a2b.tar.xz | |
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@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>
| -rw-r--r-- | drivers/usb/roles/class.c | 21 | ||||
| -rw-r--r-- | include/linux/usb/role.h | 3 |
2 files changed, 24 insertions, 0 deletions
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 @@ -51,6 +51,9 @@ 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); void usb_role_switch_unregister(struct usb_role_switch *sw); |