diff options
Diffstat (limited to 'include/media/v4l2-fwnode.h')
| -rw-r--r-- | include/media/v4l2-fwnode.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h index 6cf39d447b107..2804e58b74476 100644 --- a/include/media/v4l2-fwnode.h +++ b/include/media/v4l2-fwnode.h @@ -295,6 +295,66 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode, void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link); /** + * v4l2_fwnode_connector_free() - free the V4L2 connector acquired memory + * @connector: the V4L2 connector resources of which are to be released + * + * Free all allocated memory and put all links aquired by + * v4l2_fwnode_connector_parse() and v4l2_fwnode_connector_add_link(). + * + * It is safe to call this function with NULL argument or on a V4L2 connector + * the parsing of which failed. + */ +void v4l2_fwnode_connector_free(struct v4l2_fwnode_connector *connector); + +/** + * v4l2_fwnode_connector_parse() - initialize the 'struct v4l2_fwnode_connector' + * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector + * is connected to or to the connector endpoint fwnode handle. + * @connector: pointer to the V4L2 fwnode connector data structure + * + * Fill the &struct v4l2_fwnode_connector with the connector type, label and + * all &enum v4l2_connector_type specific connector data. The label is optional + * so it is set to %NULL if no one was found. The function intialize the links + * to zero. Adding links to the connector is done by calling + * v4l2_fwnode_connector_add_link(). + * + * The memory allocated for the label must be freed when no longer needed. + * Freeing the memory is done by v4l2_fwnode_connector_free(). + * + * Return: + * * %0 on success or a negative error code on failure: + * * %-EINVAL if @fwnode is invalid + * * %-ENOTCONN if connector type is unknown or connector device can't be found + */ +int v4l2_fwnode_connector_parse(struct fwnode_handle *fwnode, + struct v4l2_fwnode_connector *connector); + +/** + * v4l2_fwnode_connector_add_link - add a link between a connector node and + * a v4l2-subdev node. + * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector + * is connected to + * @connector: pointer to the V4L2 fwnode connector data structure + * + * Add a new &struct v4l2_connector_link link to the + * &struct v4l2_fwnode_connector connector links list. The link local_node + * points to the connector node, the remote_node to the host v4l2 (sub)dev. + * + * The taken references to remote_node and local_node must be dropped and the + * allocated memory must be freed when no longer needed. Both is done by calling + * v4l2_fwnode_connector_free(). + * + * Return: + * * %0 on success or a negative error code on failure: + * * %-EINVAL if @fwnode or @connector is invalid or @connector type is unknown + * * %-ENOMEM on link memory allocation failure + * * %-ENOTCONN if remote connector device can't be found + * * %-ENOLINK if link parsing between v4l2 (sub)dev and connector fails + */ +int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode, + struct v4l2_fwnode_connector *connector); + +/** * typedef parse_endpoint_func - Driver's callback function to be called on * each V4L2 fwnode endpoint. * @@ -467,4 +527,26 @@ v4l2_async_register_fwnode_subdev(struct v4l2_subdev *sd, unsigned int num_ports, parse_endpoint_func parse_endpoint); +/* Helper macros to access the connector links. */ + +/** v4l2_connector_last_link - Helper macro to get the first + * &struct v4l2_fwnode_connector link + * @v4l2c: &struct v4l2_fwnode_connector owning the connector links + * + * This marco returns the first added &struct v4l2_connector_link connector + * link or @NULL if the connector has no links. + */ +#define v4l2_connector_first_link(v4l2c) \ + list_first_entry_or_null(&(v4l2c)->links, \ + struct v4l2_connector_link, head) + +/** v4l2_connector_last_link - Helper macro to get the last + * &struct v4l2_fwnode_connector link + * @v4l2c: &struct v4l2_fwnode_connector owning the connector links + * + * This marco returns the last &struct v4l2_connector_link added connector link. + */ +#define v4l2_connector_last_link(v4l2c) \ + list_last_entry(&(v4l2c)->links, struct v4l2_connector_link, head) + #endif /* _V4L2_FWNODE_H */ |