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Subject: media: v4l2-fwnode: Add helper to parse device properties Author: Jacopo Mondi <[email protected]> Date: Sat May 9 11:04:49 2020 +0200 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 <[email protected]> Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/v4l2-core/v4l2-fwnode.c | 42 +++++++++++++++++++++++++++++++ include/media/v4l2-fwnode.h | 47 +++++++++++++++++++++++++++++++++++ 2 files changed, 89 insertions(+) --- diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c index e1f273ae8522..6cd52e1ef5e4 100644 --- a/drivers/media/v4l2-core/v4l2-fwnode.c +++ b/drivers/media/v4l2-core/v4l2-fwnode.c @@ -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, diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h index fad7a6480bf9..c47b70636e42 100644 --- a/include/media/v4l2-fwnode.h +++ b/include/media/v4l2-fwnode.h @@ -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. _______________________________________________ linuxtv-commits mailing list [email protected] https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
