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media: v4l2-fwnode: Add helper to parse device properties

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Add an helper function to parse common device properties in the same
way as v4l2_fwnode_endpoint_parse() parses common endpoint properties.

Parse the 'rotation' and 'orientation' properties from the firmware
interface.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Jacopo Mondi 2020-05-09 11:04:49 +02:00 committed by Mauro Carvalho Chehab
parent 926645d43f
commit 344897ef1d
2 changed files with 89 additions and 0 deletions
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42
drivers/media/v4l2-core/v4l2-fwnode.c
View File

@ -756,6 +756,48 @@ err:
}
EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_add_link);
int v4l2_fwnode_device_parse(struct device *dev,
struct v4l2_fwnode_device_properties *props)
{
struct fwnode_handle *fwnode = dev_fwnode(dev);
u32 val;
int ret;
memset(props, 0, sizeof(*props));
props->orientation = V4L2_FWNODE_PROPERTY_UNSET;
ret = fwnode_property_read_u32(fwnode, "orientation", &val);
if (!ret) {
switch (val) {
case V4L2_FWNODE_ORIENTATION_FRONT:
case V4L2_FWNODE_ORIENTATION_BACK:
case V4L2_FWNODE_ORIENTATION_EXTERNAL:
break;
default:
dev_warn(dev, "Unsupported device orientation: %u\n", val);
return -EINVAL;
}
props->orientation = val;
dev_dbg(dev, "device orientation: %u\n", val);
}
props->rotation = V4L2_FWNODE_PROPERTY_UNSET;
ret = fwnode_property_read_u32(fwnode, "rotation", &val);
if (!ret) {
if (val >= 360) {
dev_warn(dev, "Unsupported device rotation: %u\n", val);
return -EINVAL;
}
props->rotation = val;
dev_dbg(dev, "device rotation: %u\n", val);
}
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_fwnode_device_parse);
static int
v4l2_async_notifier_fwnode_parse_endpoint(struct device *dev,
struct v4l2_async_notifier *notifier,

47
include/media/v4l2-fwnode.h
View File

@ -108,6 +108,36 @@ struct v4l2_fwnode_endpoint {
unsigned int nr_of_link_frequencies;
};
/**
* V4L2_FWNODE_PROPERTY_UNSET - identify a non initialized property
*
* All properties in &struct v4l2_fwnode_device_properties are initialized
* to this value.
*/
#define V4L2_FWNODE_PROPERTY_UNSET (-1U)
/**
* enum v4l2_fwnode_orientation - possible device orientation
* @V4L2_FWNODE_ORIENTATION_FRONT: device installed on the front side
* @V4L2_FWNODE_ORIENTATION_BACK: device installed on the back side
* @V4L2_FWNODE_ORIENTATION_EXTERNAL: device externally located
*/
enum v4l2_fwnode_orientation {
V4L2_FWNODE_ORIENTATION_FRONT,
V4L2_FWNODE_ORIENTATION_BACK,
V4L2_FWNODE_ORIENTATION_EXTERNAL
};
/**
* struct v4l2_fwnode_device_properties - fwnode device properties
* @orientation: device orientation. See &enum v4l2_fwnode_orientation
* @rotation: device rotation
*/
struct v4l2_fwnode_device_properties {
enum v4l2_fwnode_orientation orientation;
unsigned int rotation;
};
/**
* struct v4l2_fwnode_link - a link between two endpoints
* @local_node: pointer to device_node of this endpoint
@ -353,6 +383,23 @@ int v4l2_fwnode_connector_parse(struct fwnode_handle *fwnode,
int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode,
struct v4l2_fwnode_connector *connector);
/**
* v4l2_fwnode_device_parse() - parse fwnode device properties
* @dev: pointer to &struct device
* @props: pointer to &struct v4l2_fwnode_device_properties where to store the
* parsed properties values
*
* This function parses and validates the V4L2 fwnode device properties from the
* firmware interface, and fills the @struct v4l2_fwnode_device_properties
* provided by the caller.
*
* Return:
* % 0 on success
* %-EINVAL if a parsed property value is not valid
*/
int v4l2_fwnode_device_parse(struct device *dev,
struct v4l2_fwnode_device_properties *props);
/**
* typedef parse_endpoint_func - Driver's callback function to be called on
* each V4L2 fwnode endpoint.