xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

media: v4l2-fwnode: add initial connector parsing support

Browse Source 
The patch adds the initial connector parsing code, so we can move from a
driver specific parsing code to a generic one. Currently only the
generic fields and the analog-connector specific fields are parsed. Parsing
the other connector specific fields can be added by a simple callbacks.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
[hverkuil-cisco@xs4all.nl: replace ; with break; in a empty case]
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Marco Felsch
2020-03-12 11:31:43 +01:00
committed by Mauro Carvalho Chehab
parent a5e1deec4e
commit dfc22c073b
2 changed files with 247 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

82
include/media/v4l2-fwnode.h
View File

@@ -294,6 +294,66 @@ 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 acquired 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 initialize 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 */