diff options
Diffstat (limited to 'include/media/v4l2-fwnode.h')
| -rw-r--r-- | include/media/v4l2-fwnode.h | 253 |
1 files changed, 250 insertions, 3 deletions
diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h index ecc1233a873e..b5b465677d28 100644 --- a/include/media/v4l2-fwnode.h +++ b/include/media/v4l2-fwnode.h @@ -25,6 +25,10 @@ #include <media/v4l2-mediabus.h> struct fwnode_handle; +struct v4l2_async_notifier; +struct v4l2_async_subdev; + +#define V4L2_FWNODE_CSI2_MAX_DATA_LANES 4 /** * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure @@ -37,10 +41,10 @@ struct fwnode_handle; */ struct v4l2_fwnode_bus_mipi_csi2 { unsigned int flags; - unsigned char data_lanes[4]; + unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES]; unsigned char clock_lane; unsigned short num_data_lanes; - bool lane_polarities[5]; + bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES]; }; /** @@ -56,6 +60,24 @@ struct v4l2_fwnode_bus_parallel { }; /** + * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure + * @clock_inv: polarity of clock/strobe signal + * false - not inverted, true - inverted + * @strobe: false - data/clock, true - data/strobe + * @lane_polarity: the polarities of the clock (index 0) and data lanes + * index (1) + * @data_lane: the number of the data lane + * @clock_lane: the number of the clock lane + */ +struct v4l2_fwnode_bus_mipi_csi1 { + bool clock_inv; + bool strobe; + bool lane_polarity[2]; + unsigned char data_lane; + unsigned char clock_lane; +}; + +/** * struct v4l2_fwnode_endpoint - the endpoint data structure * @base: fwnode endpoint of the v4l2_fwnode * @bus_type: bus type @@ -72,6 +94,7 @@ struct v4l2_fwnode_endpoint { enum v4l2_mbus_type bus_type; union { struct v4l2_fwnode_bus_parallel parallel; + struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1; struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2; } bus; u64 *link_frequencies; @@ -92,13 +115,237 @@ struct v4l2_fwnode_link { unsigned int remote_port; }; +/** + * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties + * @fwnode: pointer to the endpoint's fwnode handle + * @vep: pointer to the V4L2 fwnode data structure + * + * All properties are optional. If none are found, we don't set any flags. This + * means the port has a static configuration and no properties have to be + * specified explicitly. If any properties that identify the bus as parallel + * are found and slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if + * we recognise the bus as serial CSI-2 and clock-noncontinuous isn't set, we + * set the V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. The caller should hold a + * reference to @fwnode. + * + * NOTE: This function does not parse properties the size of which is variable + * without a low fixed limit. Please use v4l2_fwnode_endpoint_alloc_parse() in + * new drivers instead. + * + * Return: 0 on success or a negative error code on failure. + */ int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode, struct v4l2_fwnode_endpoint *vep); + +/** + * v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by + * v4l2_fwnode_endpoint_alloc_parse() + * @vep: the V4L2 fwnode the resources of which are to be released + * + * It is safe to call this function with NULL argument or on a V4L2 fwnode the + * parsing of which failed. + */ +void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep); + +/** + * v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties + * @fwnode: pointer to the endpoint's fwnode handle + * + * All properties are optional. If none are found, we don't set any flags. This + * means the port has a static configuration and no properties have to be + * specified explicitly. If any properties that identify the bus as parallel + * are found and slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if + * we recognise the bus as serial CSI-2 and clock-noncontinuous isn't set, we + * set the V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. The caller should hold a + * reference to @fwnode. + * + * v4l2_fwnode_endpoint_alloc_parse() has two important differences to + * v4l2_fwnode_endpoint_parse(): + * + * 1. It also parses variable size data. + * + * 2. The memory it has allocated to store the variable size data must be freed + * using v4l2_fwnode_endpoint_free() when no longer needed. + * + * Return: Pointer to v4l2_fwnode_endpoint if successful, on an error pointer + * on error. + */ struct v4l2_fwnode_endpoint *v4l2_fwnode_endpoint_alloc_parse( struct fwnode_handle *fwnode); -void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep); + +/** + * v4l2_fwnode_parse_link() - parse a link between two endpoints + * @fwnode: pointer to the endpoint's fwnode at the local end of the link + * @link: pointer to the V4L2 fwnode link data structure + * + * Fill the link structure with the local and remote nodes and port numbers. + * The local_node and remote_node fields are set to point to the local and + * remote port's parent nodes respectively (the port parent node being the + * parent node of the port node if that node isn't a 'ports' node, or the + * grand-parent node of the port node otherwise). + * + * A reference is taken to both the local and remote nodes, the caller must use + * v4l2_fwnode_put_link() to drop the references when done with the + * link. + * + * Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be + * found. + */ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode, struct v4l2_fwnode_link *link); + +/** + * v4l2_fwnode_put_link() - drop references to nodes in a link + * @link: pointer to the V4L2 fwnode link data structure + * + * Drop references to the local and remote nodes in the link. This function + * must be called on every link parsed with v4l2_fwnode_parse_link(). + */ void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link); + +/** + * typedef parse_endpoint_func - Driver's callback function to be called on + * each V4L2 fwnode endpoint. + * + * @dev: pointer to &struct device + * @vep: pointer to &struct v4l2_fwnode_endpoint + * @asd: pointer to &struct v4l2_async_subdev + * + * Return: + * * %0 on success + * * %-ENOTCONN if the endpoint is to be skipped but this + * should not be considered as an error + * * %-EINVAL if the endpoint configuration is invalid + */ +typedef int (*parse_endpoint_func)(struct device *dev, + struct v4l2_fwnode_endpoint *vep, + struct v4l2_async_subdev *asd); + + +/** + * v4l2_async_notifier_parse_fwnode_endpoints - Parse V4L2 fwnode endpoints in a + * device node + * @dev: the device the endpoints of which are to be parsed + * @notifier: notifier for @dev + * @asd_struct_size: size of the driver's async sub-device struct, including + * sizeof(struct v4l2_async_subdev). The &struct + * v4l2_async_subdev shall be the first member of + * the driver's async sub-device struct, i.e. both + * begin at the same memory address. + * @parse_endpoint: Driver's callback function called on each V4L2 fwnode + * endpoint. Optional. + * + * Parse the fwnode endpoints of the @dev device and populate the async sub- + * devices array of the notifier. The @parse_endpoint callback function is + * called for each endpoint with the corresponding async sub-device pointer to + * let the caller initialize the driver-specific part of the async sub-device + * structure. + * + * The notifier memory shall be zeroed before this function is called on the + * notifier. + * + * This function may not be called on a registered notifier and may be called on + * a notifier only once. + * + * Do not change the notifier's subdevs array, take references to the subdevs + * array itself or change the notifier's num_subdevs field. This is because this + * function allocates and reallocates the subdevs array based on parsing + * endpoints. + * + * The &struct v4l2_fwnode_endpoint passed to the callback function + * @parse_endpoint is released once the function is finished. If there is a need + * to retain that configuration, the user needs to allocate memory for it. + * + * Any notifier populated using this function must be released with a call to + * v4l2_async_notifier_cleanup() after it has been unregistered and the async + * sub-devices are no longer in use, even if the function returned an error. + * + * Return: %0 on success, including when no async sub-devices are found + * %-ENOMEM if memory allocation failed + * %-EINVAL if graph or endpoint parsing failed + * Other error codes as returned by @parse_endpoint + */ +int v4l2_async_notifier_parse_fwnode_endpoints( + struct device *dev, struct v4l2_async_notifier *notifier, + size_t asd_struct_size, + parse_endpoint_func parse_endpoint); + +/** + * v4l2_async_notifier_parse_fwnode_endpoints_by_port - Parse V4L2 fwnode + * endpoints of a port in a + * device node + * @dev: the device the endpoints of which are to be parsed + * @notifier: notifier for @dev + * @asd_struct_size: size of the driver's async sub-device struct, including + * sizeof(struct v4l2_async_subdev). The &struct + * v4l2_async_subdev shall be the first member of + * the driver's async sub-device struct, i.e. both + * begin at the same memory address. + * @port: port number where endpoints are to be parsed + * @parse_endpoint: Driver's callback function called on each V4L2 fwnode + * endpoint. Optional. + * + * This function is just like v4l2_async_notifier_parse_fwnode_endpoints() with + * the exception that it only parses endpoints in a given port. This is useful + * on devices that have both sinks and sources: the async sub-devices connected + * to sources have already been configured by another driver (on capture + * devices). In this case the driver must know which ports to parse. + * + * Parse the fwnode endpoints of the @dev device on a given @port and populate + * the async sub-devices array of the notifier. The @parse_endpoint callback + * function is called for each endpoint with the corresponding async sub-device + * pointer to let the caller initialize the driver-specific part of the async + * sub-device structure. + * + * The notifier memory shall be zeroed before this function is called on the + * notifier the first time. + * + * This function may not be called on a registered notifier and may be called on + * a notifier only once per port. + * + * Do not change the notifier's subdevs array, take references to the subdevs + * array itself or change the notifier's num_subdevs field. This is because this + * function allocates and reallocates the subdevs array based on parsing + * endpoints. + * + * The &struct v4l2_fwnode_endpoint passed to the callback function + * @parse_endpoint is released once the function is finished. If there is a need + * to retain that configuration, the user needs to allocate memory for it. + * + * Any notifier populated using this function must be released with a call to + * v4l2_async_notifier_cleanup() after it has been unregistered and the async + * sub-devices are no longer in use, even if the function returned an error. + * + * Return: %0 on success, including when no async sub-devices are found + * %-ENOMEM if memory allocation failed + * %-EINVAL if graph or endpoint parsing failed + * Other error codes as returned by @parse_endpoint + */ +int v4l2_async_notifier_parse_fwnode_endpoints_by_port( + struct device *dev, struct v4l2_async_notifier *notifier, + size_t asd_struct_size, unsigned int port, + parse_endpoint_func parse_endpoint); + +/** + * v4l2_fwnode_reference_parse_sensor_common - parse common references on + * sensors for async sub-devices + * @dev: the device node the properties of which are parsed for references + * @notifier: the async notifier where the async subdevs will be added + * + * Parse common sensor properties for remote devices related to the + * sensor and set up async sub-devices for them. + * + * Any notifier populated using this function must be released with a call to + * v4l2_async_notifier_release() after it has been unregistered and the async + * sub-devices are no longer in use, even in the case the function returned an + * error. + * + * Return: 0 on success + * -ENOMEM if memory allocation failed + * -EINVAL if property parsing failed + */ +int v4l2_async_notifier_parse_fwnode_sensor_common( + struct device *dev, struct v4l2_async_notifier *notifier); + #endif /* _V4L2_FWNODE_H */ |