Add a function which allows other subsystems to find a connector based on a fwnode.
This will be used by the USB-Type-C code to be able to find the DP connector to which to send hotplug events received by a Type-C port in DP-alternate-mode.
Note this function is defined in drivers/gpu/drm/drm_sysfs.c because it needs access to the drm_sysfs_device_connector device_type struct.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/gpu/drm/drm_sysfs.c | 38 +++++++++++++++++++++++++++++++++++++ include/drm/drm_connector.h | 1 + 2 files changed, 39 insertions(+)
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c index c1d3e2b843b7..ca71c46fad78 100644 --- a/drivers/gpu/drm/drm_sysfs.c +++ b/drivers/gpu/drm/drm_sysfs.c @@ -520,3 +520,41 @@ void drm_class_device_unregister(struct device *dev) return device_unregister(dev); } EXPORT_SYMBOL_GPL(drm_class_device_unregister); + +/** + * drm_connector_find_by_fwnode - Find a connector based on the associated fwnode + * @fwnode: fwnode for which to find the matching drm_connector + * + * This functions looks up a drm_connector based on its associated fwnode. When + * a connector is found a reference to the connector is returned. The caller must + * call drm_connector_put() to release this reference when it is done with the + * connector. + * + * Returns: A reference to the found connector or NULL if no matching connector was found + */ +struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode) +{ + struct drm_connector *connector, *found = NULL; + struct class_dev_iter iter; + struct device *dev; + + if (!fwnode) + return NULL; + + class_dev_iter_init(&iter, drm_class, NULL, &drm_sysfs_device_connector); + while ((dev = class_dev_iter_next(&iter))) { + connector = to_drm_connector(dev); + + if ((connector->fwnode == fwnode) || + (connector->fwnode && connector->fwnode->secondary == fwnode)) { + drm_connector_get(connector); + found = connector; + break; + } + + } + class_dev_iter_exit(&iter); + + return found; +} +EXPORT_SYMBOL(drm_connector_find_by_fwnode); diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index d20bfd7576ed..1e5d154d1f4a 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1696,6 +1696,7 @@ drm_connector_is_unregistered(struct drm_connector *connector) DRM_CONNECTOR_UNREGISTERED; }
+struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode); const char *drm_get_connector_type_name(unsigned int connector_type); const char *drm_get_connector_status_name(enum drm_connector_status status); const char *drm_get_subpixel_order_name(enum subpixel_order order);