362 lines
14 KiB
C
362 lines
14 KiB
C
/*
|
|
* V4L2 fwnode binding parsing library
|
|
*
|
|
* Copyright (c) 2016 Intel Corporation.
|
|
* Author: Sakari Ailus <sakari.ailus@linux.intel.com>
|
|
*
|
|
* Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
|
|
* Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
|
|
*
|
|
* Copyright (C) 2012 Renesas Electronics Corp.
|
|
* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef _V4L2_FWNODE_H
|
|
#define _V4L2_FWNODE_H
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/fwnode.h>
|
|
#include <linux/list.h>
|
|
#include <linux/types.h>
|
|
|
|
#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
|
|
* @flags: media bus (V4L2_MBUS_*) flags
|
|
* @data_lanes: an array of physical data lane indexes
|
|
* @clock_lane: physical lane index of the clock lane
|
|
* @num_data_lanes: number of data lanes
|
|
* @lane_polarities: polarity of the lanes. The order is the same of
|
|
* the physical lanes.
|
|
*/
|
|
struct v4l2_fwnode_bus_mipi_csi2 {
|
|
unsigned int flags;
|
|
unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES];
|
|
unsigned char clock_lane;
|
|
unsigned short num_data_lanes;
|
|
bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
|
|
};
|
|
|
|
/**
|
|
* struct v4l2_fwnode_bus_parallel - parallel data bus data structure
|
|
* @flags: media bus (V4L2_MBUS_*) flags
|
|
* @bus_width: bus width in bits
|
|
* @data_shift: data shift in bits
|
|
*/
|
|
struct v4l2_fwnode_bus_parallel {
|
|
unsigned int flags;
|
|
unsigned char bus_width;
|
|
unsigned char data_shift;
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
* @bus: union with bus configuration data structure
|
|
* @bus.parallel: embedded &struct v4l2_fwnode_bus_parallel.
|
|
* Used if the bus is parallel.
|
|
* @bus.mipi_csi1: embedded &struct v4l2_fwnode_bus_mipi_csi1.
|
|
* Used if the bus is MIPI Alliance's Camera Serial
|
|
* Interface version 1 (MIPI CSI1) or Standard
|
|
* Mobile Imaging Architecture's Compact Camera Port 2
|
|
* (SMIA CCP2).
|
|
* @bus.mipi_csi2: embedded &struct v4l2_fwnode_bus_mipi_csi2.
|
|
* Used if the bus is MIPI Alliance's Camera Serial
|
|
* Interface version 2 (MIPI CSI2).
|
|
* @link_frequencies: array of supported link frequencies
|
|
* @nr_of_link_frequencies: number of elements in link_frequenccies array
|
|
*/
|
|
struct v4l2_fwnode_endpoint {
|
|
struct fwnode_endpoint base;
|
|
/*
|
|
* Fields below this line will be zeroed by
|
|
* v4l2_fwnode_endpoint_parse()
|
|
*/
|
|
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;
|
|
unsigned int nr_of_link_frequencies;
|
|
};
|
|
|
|
/**
|
|
* struct v4l2_fwnode_link - a link between two endpoints
|
|
* @local_node: pointer to device_node of this endpoint
|
|
* @local_port: identifier of the port this endpoint belongs to
|
|
* @remote_node: pointer to device_node of the remote endpoint
|
|
* @remote_port: identifier of the port the remote endpoint belongs to
|
|
*/
|
|
struct v4l2_fwnode_link {
|
|
struct fwnode_handle *local_node;
|
|
unsigned int local_port;
|
|
struct fwnode_handle *remote_node;
|
|
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);
|
|
|
|
/**
|
|
* 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 */
|