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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* V4L2 controls support header.
*
* Copyright (C) 2010 Hans Verkuil <[email protected]>
*/
#ifndef _V4L2_CTRLS_H
#define _V4L2_CTRLS_H
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <media/media-request.h>
/*
* Include the stateless codec compound control definitions.
* This will move to the public headers once this API is fully stable.
*/
#include <media/hevc-ctrls.h>
/* forward references */
struct file;
struct poll_table_struct;
struct v4l2_ctrl;
struct v4l2_ctrl_handler;
struct v4l2_ctrl_helper;
struct v4l2_fh;
struct v4l2_fwnode_device_properties;
struct v4l2_subdev;
struct v4l2_subscribed_event;
struct video_device;
/**
* union v4l2_ctrl_ptr - A pointer to a control value.
* @p_s32: Pointer to a 32-bit signed value.
* @p_s64: Pointer to a 64-bit signed value.
* @p_u8: Pointer to a 8-bit unsigned value.
* @p_u16: Pointer to a 16-bit unsigned value.
* @p_u32: Pointer to a 32-bit unsigned value.
* @p_char: Pointer to a string.
* @p_mpeg2_sequence: Pointer to a MPEG2 sequence structure.
* @p_mpeg2_picture: Pointer to a MPEG2 picture structure.
* @p_mpeg2_quantisation: Pointer to a MPEG2 quantisation data structure.
* @p_fwht_params: Pointer to a FWHT stateless parameters structure.
* @p_h264_sps: Pointer to a struct v4l2_ctrl_h264_sps.
* @p_h264_pps: Pointer to a struct v4l2_ctrl_h264_pps.
* @p_h264_scaling_matrix: Pointer to a struct v4l2_ctrl_h264_scaling_matrix.
* @p_h264_slice_params: Pointer to a struct v4l2_ctrl_h264_slice_params.
* @p_h264_decode_params: Pointer to a struct v4l2_ctrl_h264_decode_params.
* @p_h264_pred_weights: Pointer to a struct v4l2_ctrl_h264_pred_weights.
* @p_vp8_frame: Pointer to a VP8 frame params structure.
* @p_hevc_sps: Pointer to an HEVC sequence parameter set structure.
* @p_hevc_pps: Pointer to an HEVC picture parameter set structure.
* @p_hevc_slice_params: Pointer to an HEVC slice parameters structure.
* @p_hdr10_cll: Pointer to an HDR10 Content Light Level structure.
* @p_hdr10_mastering: Pointer to an HDR10 Mastering Display structure.
* @p_area: Pointer to an area.
* @p: Pointer to a compound value.
* @p_const: Pointer to a constant compound value.
*/
union v4l2_ctrl_ptr {
s32 *p_s32;
s64 *p_s64;
u8 *p_u8;
u16 *p_u16;
u32 *p_u32;
char *p_char;
struct v4l2_ctrl_mpeg2_sequence *p_mpeg2_sequence;
struct v4l2_ctrl_mpeg2_picture *p_mpeg2_picture;
struct v4l2_ctrl_mpeg2_quantisation *p_mpeg2_quantisation;
struct v4l2_ctrl_fwht_params *p_fwht_params;
struct v4l2_ctrl_h264_sps *p_h264_sps;
struct v4l2_ctrl_h264_pps *p_h264_pps;
struct v4l2_ctrl_h264_scaling_matrix *p_h264_scaling_matrix;
struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
struct v4l2_ctrl_h264_decode_params *p_h264_decode_params;
struct v4l2_ctrl_h264_pred_weights *p_h264_pred_weights;
struct v4l2_ctrl_vp8_frame *p_vp8_frame;
struct v4l2_ctrl_hevc_sps *p_hevc_sps;
struct v4l2_ctrl_hevc_pps *p_hevc_pps;
struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
struct v4l2_ctrl_hdr10_cll_info *p_hdr10_cll;
struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
struct v4l2_area *p_area;
void *p;
const void *p_const;
};
/**
* v4l2_ctrl_ptr_create() - Helper function to return a v4l2_ctrl_ptr from a
* void pointer
* @ptr: The void pointer
*/
static inline union v4l2_ctrl_ptr v4l2_ctrl_ptr_create(void *ptr)
{
union v4l2_ctrl_ptr p = { .p = ptr };
return p;
}
/**
* struct v4l2_ctrl_ops - The control operations that the driver has to provide.
*
* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
* for volatile (and usually read-only) controls such as a control
* that returns the current signal strength which changes
* continuously.
* If not set, then the currently cached value will be returned.
* @try_ctrl: Test whether the control's value is valid. Only relevant when
* the usual min/max/step checks are not sufficient.
* @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The
* ctrl->handler->lock is held when these ops are called, so no
* one else can access controls owned by that handler.
*/
struct v4l2_ctrl_ops {
int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
int (*try_ctrl)(struct v4l2_ctrl *ctrl);
int (*s_ctrl)(struct v4l2_ctrl *ctrl);
};
/**
* struct v4l2_ctrl_type_ops - The control type operations that the driver
* has to provide.
*
* @equal: return true if both values are equal.
* @init: initialize the value.
* @log: log the value.
* @validate: validate the value. Return 0 on success and a negative value
* otherwise.
*/
struct v4l2_ctrl_type_ops {
bool (*equal)(const struct v4l2_ctrl *ctrl, u32 idx,
union v4l2_ctrl_ptr ptr1,
union v4l2_ctrl_ptr ptr2);
void (*init)(const struct v4l2_ctrl *ctrl, u32 idx,
union v4l2_ctrl_ptr ptr);
void (*log)(const struct v4l2_ctrl *ctrl);
int (*validate)(const struct v4l2_ctrl *ctrl, u32 idx,
union v4l2_ctrl_ptr ptr);
};
/**
* typedef v4l2_ctrl_notify_fnc - typedef for a notify argument with a function
* that should be called when a control value has changed.
*
* @ctrl: pointer to struct &v4l2_ctrl
* @priv: control private data
*
* This typedef definition is used as an argument to v4l2_ctrl_notify()
* and as an argument at struct &v4l2_ctrl_handler.
*/
typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
/**
* struct v4l2_ctrl - The control structure.
*
* @node: The list node.
* @ev_subs: The list of control event subscriptions.
* @handler: The handler that owns the control.
* @cluster: Point to start of cluster array.
* @ncontrols: Number of controls in cluster array.
* @done: Internal flag: set for each processed control.
* @is_new: Set when the user specified a new value for this control. It
* is also set when called from v4l2_ctrl_handler_setup(). Drivers
* should never set this flag.
* @has_changed: Set when the current value differs from the new value. Drivers
* should never use this flag.
* @is_private: If set, then this control is private to its handler and it
* will not be added to any other handlers. Drivers can set
* this flag.
* @is_auto: If set, then this control selects whether the other cluster
* members are in 'automatic' mode or 'manual' mode. This is
* used for autogain/gain type clusters. Drivers should never
* set this flag directly.
* @is_int: If set, then this control has a simple integer value (i.e. it
* uses ctrl->val).
* @is_string: If set, then this control has type %V4L2_CTRL_TYPE_STRING.
* @is_ptr: If set, then this control is an array and/or has type >=
* %V4L2_CTRL_COMPOUND_TYPES
* and/or has type %V4L2_CTRL_TYPE_STRING. In other words, &struct
* v4l2_ext_control uses field p to point to the data.
* @is_array: If set, then this control contains an N-dimensional array.
* @has_volatiles: If set, then one or more members of the cluster are volatile.
* Drivers should never touch this flag.
* @call_notify: If set, then call the handler's notify function whenever the
* control's value changes.
* @manual_mode_value: If the is_auto flag is set, then this is the value
* of the auto control that determines if that control is in
* manual mode. So if the value of the auto control equals this
* value, then the whole cluster is in manual mode. Drivers should
* never set this flag directly.
* @ops: The control ops.
* @type_ops: The control type ops.
* @id: The control ID.
* @name: The control name.
* @type: The control type.
* @minimum: The control's minimum value.
* @maximum: The control's maximum value.
* @default_value: The control's default value.
* @step: The control's step value for non-menu controls.
* @elems: The number of elements in the N-dimensional array.
* @elem_size: The size in bytes of the control.
* @dims: The size of each dimension.
* @nr_of_dims:The number of dimensions in @dims.
* @menu_skip_mask: The control's skip mask for menu controls. This makes it
* easy to skip menu items that are not valid. If bit X is set,
* then menu item X is skipped. Of course, this only works for
* menus with <= 32 menu items. There are no menus that come
* close to that number, so this is OK. Should we ever need more,
* then this will have to be extended to a u64 or a bit array.
* @qmenu: A const char * array for all menu items. Array entries that are
* empty strings ("") correspond to non-existing menu items (this
* is in addition to the menu_skip_mask above). The last entry
* must be NULL.
* Used only if the @type is %V4L2_CTRL_TYPE_MENU.
* @qmenu_int: A 64-bit integer array for with integer menu items.
* The size of array must be equal to the menu size, e. g.:
* :math:`ceil(\frac{maximum - minimum}{step}) + 1`.
* Used only if the @type is %V4L2_CTRL_TYPE_INTEGER_MENU.
* @flags: The control's flags.
* @cur: Structure to store the current value.
* @cur.val: The control's current value, if the @type is represented via
* a u32 integer (see &enum v4l2_ctrl_type).
* @val: The control's new s32 value.
* @priv: The control's private pointer. For use by the driver. It is
* untouched by the control framework. Note that this pointer is
* not freed when the control is deleted. Should this be needed
* then a new internal bitfield can be added to tell the framework
* to free this pointer.
* @p_def: The control's default value represented via a union which
* provides a standard way of accessing control types
* through a pointer (for compound controls only).
* @p_cur: The control's current value represented via a union which
* provides a standard way of accessing control types
* through a pointer.
* @p_new: The control's new value represented via a union which provides
* a standard way of accessing control types
* through a pointer.
*/
struct v4l2_ctrl {
/* Administrative fields */
struct list_head node;
struct list_head ev_subs;
struct v4l2_ctrl_handler *handler;
struct v4l2_ctrl **cluster;
unsigned int ncontrols;
unsigned int done:1;
unsigned int is_new:1;
unsigned int has_changed:1;
unsigned int is_private:1;
unsigned int is_auto:1;
unsigned int is_int:1;
unsigned int is_string:1;
unsigned int is_ptr:1;
unsigned int is_array:1;
unsigned int has_volatiles:1;
unsigned int call_notify:1;
unsigned int manual_mode_value:8;
const struct v4l2_ctrl_ops *ops;
const struct v4l2_ctrl_type_ops *type_ops;
u32 id;
const char *name;
enum v4l2_ctrl_type type;
s64 minimum, maximum, default_value;
u32 elems;
u32 elem_size;
u32 dims[V4L2_CTRL_MAX_DIMS];
u32 nr_of_dims;
union {
u64 step;
u64 menu_skip_mask;
};
union {
const char * const *qmenu;
const s64 *qmenu_int;
};
unsigned long flags;
void *priv;
s32 val;
struct {
s32 val;
} cur;
union v4l2_ctrl_ptr p_def;
union v4l2_ctrl_ptr p_new;
union v4l2_ctrl_ptr p_cur;
};
/**
* struct v4l2_ctrl_ref - The control reference.
*
* @node: List node for the sorted list.
* @next: Single-link list node for the hash.
* @ctrl: The actual control information.
* @helper: Pointer to helper struct. Used internally in
* ``prepare_ext_ctrls`` function at ``v4l2-ctrl.c``.
* @from_other_dev: If true, then @ctrl was defined in another
* device than the &struct v4l2_ctrl_handler.
* @req_done: Internal flag: if the control handler containing this control
* reference is bound to a media request, then this is set when
* the control has been applied. This prevents applying controls
* from a cluster with multiple controls twice (when the first
* control of a cluster is applied, they all are).
* @valid_p_req: If set, then p_req contains the control value for the request.
* @p_req: If the control handler containing this control reference
* is bound to a media request, then this points to the
* value of the control that must be applied when the request
* is executed, or to the value of the control at the time
* that the request was completed. If @valid_p_req is false,
* then this control was never set for this request and the
* control will not be updated when this request is applied.
*
* Each control handler has a list of these refs. The list_head is used to
* keep a sorted-by-control-ID list of all controls, while the next pointer
* is used to link the control in the hash's bucket.
*/
struct v4l2_ctrl_ref {
struct list_head node;
struct v4l2_ctrl_ref *next;
struct v4l2_ctrl *ctrl;
struct v4l2_ctrl_helper *helper;
bool from_other_dev;
bool req_done;
bool valid_p_req;
union v4l2_ctrl_ptr p_req;
};
/**
* struct v4l2_ctrl_handler - The control handler keeps track of all the
* controls: both the controls owned by the handler and those inherited
* from other handlers.
*
* @_lock: Default for "lock".
* @lock: Lock to control access to this handler and its controls.
* May be replaced by the user right after init.
* @ctrls: The list of controls owned by this handler.
* @ctrl_refs: The list of control references.
* @cached: The last found control reference. It is common that the same
* control is needed multiple times, so this is a simple
* optimization.
* @buckets: Buckets for the hashing. Allows for quick control lookup.
* @notify: A notify callback that is called whenever the control changes
* value.
* Note that the handler's lock is held when the notify function
* is called!
* @notify_priv: Passed as argument to the v4l2_ctrl notify callback.
* @nr_of_buckets: Total number of buckets in the array.
* @error: The error code of the first failed control addition.
* @request_is_queued: True if the request was queued.
* @requests: List to keep track of open control handler request objects.
* For the parent control handler (@req_obj.ops == NULL) this
* is the list header. When the parent control handler is
* removed, it has to unbind and put all these requests since
* they refer to the parent.
* @requests_queued: List of the queued requests. This determines the order
* in which these controls are applied. Once the request is
* completed it is removed from this list.
* @req_obj: The &struct media_request_object, used to link into a
* &struct media_request. This request object has a refcount.
*/
struct v4l2_ctrl_handler {
struct mutex _lock;
struct mutex *lock;
struct list_head ctrls;
struct list_head ctrl_refs;
struct v4l2_ctrl_ref *cached;
struct v4l2_ctrl_ref **buckets;
v4l2_ctrl_notify_fnc notify;
void *notify_priv;
u16 nr_of_buckets;
int error;
bool request_is_queued;
struct list_head requests;
struct list_head requests_queued;
struct media_request_object req_obj;
};
/**
* struct v4l2_ctrl_config - Control configuration structure.
*
* @ops: The control ops.
* @type_ops: The control type ops. Only needed for compound controls.
* @id: The control ID.
* @name: The control name.
* @type: The control type.
* @min: The control's minimum value.
* @max: The control's maximum value.
* @step: The control's step value for non-menu controls.
* @def: The control's default value.
* @p_def: The control's default value for compound controls.
* @dims: The size of each dimension.
* @elem_size: The size in bytes of the control.
* @flags: The control's flags.
* @menu_skip_mask: The control's skip mask for menu controls. This makes it
* easy to skip menu items that are not valid. If bit X is set,
* then menu item X is skipped. Of course, this only works for
* menus with <= 64 menu items. There are no menus that come
* close to that number, so this is OK. Should we ever need more,
* then this will have to be extended to a bit array.
* @qmenu: A const char * array for all menu items. Array entries that are
* empty strings ("") correspond to non-existing menu items (this
* is in addition to the menu_skip_mask above). The last entry
* must be NULL.
* @qmenu_int: A const s64 integer array for all menu items of the type
* V4L2_CTRL_TYPE_INTEGER_MENU.
* @is_private: If set, then this control is private to its handler and it
* will not be added to any other handlers.
*/
struct v4l2_ctrl_config {
const struct v4l2_ctrl_ops *ops;
const struct v4l2_ctrl_type_ops *type_ops;
u32 id;
const char *name;
enum v4l2_ctrl_type type;
s64 min;
s64 max;
u64 step;
s64 def;
union v4l2_ctrl_ptr p_def;
u32 dims[V4L2_CTRL_MAX_DIMS];
u32 elem_size;
u32 flags;
u64 menu_skip_mask;
const char * const *qmenu;
const s64 *qmenu_int;
unsigned int is_private:1;
};
/**
* v4l2_ctrl_fill - Fill in the control fields based on the control ID.
*
* @id: ID of the control
* @name: pointer to be filled with a string with the name of the control
* @type: pointer for storing the type of the control
* @min: pointer for storing the minimum value for the control
* @max: pointer for storing the maximum value for the control
* @step: pointer for storing the control step
* @def: pointer for storing the default value for the control
* @flags: pointer for storing the flags to be used on the control
*
* This works for all standard V4L2 controls.
* For non-standard controls it will only fill in the given arguments
* and @name content will be set to %NULL.
*
* This function will overwrite the contents of @name, @type and @flags.
* The contents of @min, @max, @step and @def may be modified depending on
* the type.
*
* .. note::
*
* Do not use in drivers! It is used internally for backwards compatibility
* control handling only. Once all drivers are converted to use the new
* control framework this function will no longer be exported.
*/
void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags);
/**
* v4l2_ctrl_handler_init_class() - Initialize the control handler.
* @hdl: The control handler.
* @nr_of_controls_hint: A hint of how many controls this handler is
* expected to refer to. This is the total number, so including
* any inherited controls. It doesn't have to be precise, but if
* it is way off, then you either waste memory (too many buckets
* are allocated) or the control lookup becomes slower (not enough
* buckets are allocated, so there are more slow list lookups).
* It will always work, though.
* @key: Used by the lock validator if CONFIG_LOCKDEP is set.
* @name: Used by the lock validator if CONFIG_LOCKDEP is set.
*
* .. attention::
*
* Never use this call directly, always use the v4l2_ctrl_handler_init()
* macro that hides the @key and @name arguments.
*
* Return: returns an error if the buckets could not be allocated. This
* error will also be stored in @hdl->error.
*/
int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
unsigned int nr_of_controls_hint,
struct lock_class_key *key, const char *name);
#ifdef CONFIG_LOCKDEP
/**
* v4l2_ctrl_handler_init - helper function to create a static struct
* &lock_class_key and calls v4l2_ctrl_handler_init_class()
*
* @hdl: The control handler.
* @nr_of_controls_hint: A hint of how many controls this handler is
* expected to refer to. This is the total number, so including
* any inherited controls. It doesn't have to be precise, but if
* it is way off, then you either waste memory (too many buckets
* are allocated) or the control lookup becomes slower (not enough
* buckets are allocated, so there are more slow list lookups).
* It will always work, though.
*
* This helper function creates a static struct &lock_class_key and
* calls v4l2_ctrl_handler_init_class(), providing a proper name for the lock
* validador.
*
* Use this helper function to initialize a control handler.
*/
#define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \
( \
({ \
static struct lock_class_key _key; \
v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, \
&_key, \
KBUILD_BASENAME ":" \
__stringify(__LINE__) ":" \
"(" #hdl ")->_lock"); \
}) \
)
#else
#define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \
v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, NULL, NULL)
#endif
/**
* v4l2_ctrl_handler_free() - Free all controls owned by the handler and free
* the control list.
* @hdl: The control handler.
*
* Does nothing if @hdl == NULL.
*/
void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl);
/**
* v4l2_ctrl_lock() - Helper function to lock the handler
* associated with the control.
* @ctrl: The control to lock.
*/
static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl)
{
mutex_lock(ctrl->handler->lock);
}
/**
* v4l2_ctrl_unlock() - Helper function to unlock the handler
* associated with the control.
* @ctrl: The control to unlock.
*/
static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
{
mutex_unlock(ctrl->handler->lock);
}
/**
* __v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
* to the handler to initialize the hardware to the current control values. The
* caller is responsible for acquiring the control handler mutex on behalf of
* __v4l2_ctrl_handler_setup().
* @hdl: The control handler.
*
* Button controls will be skipped, as are read-only controls.
*
* If @hdl == NULL, then this just returns 0.
*/
int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl);
/**
* v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
* to the handler to initialize the hardware to the current control values.
* @hdl: The control handler.
*
* Button controls will be skipped, as are read-only controls.
*
* If @hdl == NULL, then this just returns 0.
*/
int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl);
/**
* v4l2_ctrl_handler_log_status() - Log all controls owned by the handler.
* @hdl: The control handler.
* @prefix: The prefix to use when logging the control values. If the
* prefix does not end with a space, then ": " will be added
* after the prefix. If @prefix == NULL, then no prefix will be
* used.
*
* For use with VIDIOC_LOG_STATUS.
*
* Does nothing if @hdl == NULL.
*/
void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
const char *prefix);
/**
* v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2
* control.
*
* @hdl: The control handler.
* @cfg: The control's configuration data.
* @priv: The control's driver-specific private data.
*
* If the &v4l2_ctrl struct could not be allocated then NULL is returned
* and @hdl->error is set to the error code (if it wasn't set already).
*/
struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_config *cfg,
void *priv);
/**
* v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu
* control.
*
* @hdl: The control handler.
* @ops: The control ops.
* @id: The control ID.
* @min: The control's minimum value.
* @max: The control's maximum value.
* @step: The control's step value
* @def: The control's default value.
*
* If the &v4l2_ctrl struct could not be allocated, or the control
* ID is not known, then NULL is returned and @hdl->error is set to the
* appropriate error code (if it wasn't set already).
*
* If @id refers to a menu control, then this function will return NULL.
*
* Use v4l2_ctrl_new_std_menu() when adding menu controls.
*/
struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ops,
u32 id, s64 min, s64 max, u64 step,
s64 def);
/**
* v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2
* menu control.
*
* @hdl: The control handler.
* @ops: The control ops.
* @id: The control ID.
* @max: The control's maximum value.
* @mask: The control's skip mask for menu controls. This makes it
* easy to skip menu items that are not valid. If bit X is set,
* then menu item X is skipped. Of course, this only works for
* menus with <= 64 menu items. There are no menus that come
* close to that number, so this is OK. Should we ever need more,
* then this will have to be extended to a bit array.
* @def: The control's default value.
*
* Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value
* determines which menu items are to be skipped.
*
* If @id refers to a non-menu control, then this function will return NULL.
*/
struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ops,
u32 id, u8 max, u64 mask, u8 def);
/**
* v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control
* with driver specific menu.
*
* @hdl: The control handler.
* @ops: The control ops.
* @id: The control ID.
* @max: The control's maximum value.
* @mask: The control's skip mask for menu controls. This makes it
* easy to skip menu items that are not valid. If bit X is set,
* then menu item X is skipped. Of course, this only works for
* menus with <= 64 menu items. There are no menus that come
* close to that number, so this is OK. Should we ever need more,
* then this will have to be extended to a bit array.
* @def: The control's default value.
* @qmenu: The new menu.
*
* Same as v4l2_ctrl_new_std_menu(), but @qmenu will be the driver specific
* menu of this control.
*
*/
struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ops,
u32 id, u8 max,
u64 mask, u8 def,
const char * const *qmenu);
/**
* v4l2_ctrl_new_std_compound() - Allocate and initialize a new standard V4L2
* compound control.
*
* @hdl: The control handler.
* @ops: The control ops.
* @id: The control ID.
* @p_def: The control's default value.
*
* Sames as v4l2_ctrl_new_std(), but with support to compound controls, thanks
* to the @p_def field. Use v4l2_ctrl_ptr_create() to create @p_def from a
* pointer. Use v4l2_ctrl_ptr_create(NULL) if the default value of the
* compound control should be all zeroes.
*
*/
struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ops,
u32 id,
const union v4l2_ctrl_ptr p_def);
/**
* v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control.
*
* @hdl: The control handler.
* @ops: The control ops.
* @id: The control ID.
* @max: The control's maximum value.
* @def: The control's default value.
* @qmenu_int: The control's menu entries.
*
* Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionally
* takes as an argument an array of integers determining the menu items.
*
* If @id refers to a non-integer-menu control, then this function will
* return %NULL.
*/
struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ops,
u32 id, u8 max, u8 def,
const s64 *qmenu_int);
/**
* typedef v4l2_ctrl_filter - Typedef to define the filter function to be
* used when adding a control handler.
*
* @ctrl: pointer to struct &v4l2_ctrl.
*/
typedef bool (*v4l2_ctrl_filter)(const struct v4l2_ctrl *ctrl);
/**
* v4l2_ctrl_add_handler() - Add all controls from handler @add to
* handler @hdl.
*
* @hdl: The control handler.
* @add: The control handler whose controls you want to add to
* the @hdl control handler.
* @filter: This function will filter which controls should be added.
* @from_other_dev: If true, then the controls in @add were defined in another
* device than @hdl.
*
* Does nothing if either of the two handlers is a NULL pointer.
* If @filter is NULL, then all controls are added. Otherwise only those
* controls for which @filter returns true will be added.
* In case of an error @hdl->error will be set to the error code (if it
* wasn't set already).
*/
int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
struct v4l2_ctrl_handler *add,
v4l2_ctrl_filter filter,
bool from_other_dev);
/**
* v4l2_ctrl_radio_filter() - Standard filter for radio controls.
*
* @ctrl: The control that is filtered.
*
* This will return true for any controls that are valid for radio device
* nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM
* transmitter class controls.
*
* This function is to be used with v4l2_ctrl_add_handler().
*/
bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl);
/**
* v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging
* to that cluster.
*
* @ncontrols: The number of controls in this cluster.
* @controls: The cluster control array of size @ncontrols.
*/
void v4l2_ctrl_cluster(unsigned int ncontrols, struct v4l2_ctrl **controls);
/**
* v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging
* to that cluster and set it up for autofoo/foo-type handling.
*
* @ncontrols: The number of controls in this cluster.
* @controls: The cluster control array of size @ncontrols. The first control
* must be the 'auto' control (e.g. autogain, autoexposure, etc.)
* @manual_val: The value for the first control in the cluster that equals the
* manual setting.
* @set_volatile: If true, then all controls except the first auto control will
* be volatile.
*
* Use for control groups where one control selects some automatic feature and
* the other controls are only active whenever the automatic feature is turned
* off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs
* red and blue balance, etc.
*
* The behavior of such controls is as follows:
*
* When the autofoo control is set to automatic, then any manual controls
* are set to inactive and any reads will call g_volatile_ctrl (if the control
* was marked volatile).
*
* When the autofoo control is set to manual, then any manual controls will
* be marked active, and any reads will just return the current value without
* going through g_volatile_ctrl.
*
* In addition, this function will set the %V4L2_CTRL_FLAG_UPDATE flag
* on the autofoo control and %V4L2_CTRL_FLAG_INACTIVE on the foo control(s)
* if autofoo is in auto mode.
*/
void v4l2_ctrl_auto_cluster(unsigned int ncontrols,
struct v4l2_ctrl **controls,
u8 manual_val, bool set_volatile);
/**
* v4l2_ctrl_find() - Find a control with the given ID.
*
* @hdl: The control handler.
* @id: The control ID to find.
*
* If @hdl == NULL this will return NULL as well. Will lock the handler so
* do not use from inside &v4l2_ctrl_ops.
*/
struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
/**
* v4l2_ctrl_activate() - Make the control active or inactive.
* @ctrl: The control to (de)activate.
* @active: True if the control should become active.
*
* This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically.
* Does nothing if @ctrl == NULL.
* This will usually be called from within the s_ctrl op.
* The V4L2_EVENT_CTRL event will be generated afterwards.
*
* This function assumes that the control handler is locked.
*/
void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
/**
* __v4l2_ctrl_grab() - Unlocked variant of v4l2_ctrl_grab.
*
* @ctrl: The control to (de)activate.
* @grabbed: True if the control should become grabbed.
*
* This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically.
* Does nothing if @ctrl == NULL.
* The V4L2_EVENT_CTRL event will be generated afterwards.
* This will usually be called when starting or stopping streaming in the
* driver.
*
* This function assumes that the control handler is locked by the caller.
*/
void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
/**
* v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed.
*
* @ctrl: The control to (de)activate.
* @grabbed: True if the control should become grabbed.
*
* This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically.
* Does nothing if @ctrl == NULL.
* The V4L2_EVENT_CTRL event will be generated afterwards.
* This will usually be called when starting or stopping streaming in the
* driver.
*
* This function assumes that the control handler is not locked and will
* take the lock itself.
*/
static inline void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
{
if (!ctrl)
return;
v4l2_ctrl_lock(ctrl);
__v4l2_ctrl_grab(ctrl, grabbed);
v4l2_ctrl_unlock(ctrl);
}
/**
*__v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range()
*
* @ctrl: The control to update.
* @min: The control's minimum value.
* @max: The control's maximum value.
* @step: The control's step value
* @def: The control's default value.
*
* Update the range of a control on the fly. This works for control types
* INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the
* @step value is interpreted as a menu_skip_mask.
*
* An error is returned if one of the range arguments is invalid for this
* control type.
*
* The caller is responsible for acquiring the control handler mutex on behalf
* of __v4l2_ctrl_modify_range().
*/
int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
s64 min, s64 max, u64 step, s64 def);
/**
* v4l2_ctrl_modify_range() - Update the range of a control.
*
* @ctrl: The control to update.
* @min: The control's minimum value.
* @max: The control's maximum value.
* @step: The control's step value
* @def: The control's default value.
*
* Update the range of a control on the fly. This works for control types
* INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the
* @step value is interpreted as a menu_skip_mask.
*
* An error is returned if one of the range arguments is invalid for this
* control type.
*
* This function assumes that the control handler is not locked and will
* take the lock itself.
*/
static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
s64 min, s64 max, u64 step, s64 def)
{
int rval;
v4l2_ctrl_lock(ctrl);
rval = __v4l2_ctrl_modify_range(ctrl, min, max, step, def);
v4l2_ctrl_unlock(ctrl);
return rval;
}
/**
* v4l2_ctrl_notify() - Function to set a notify callback for a control.
*
* @ctrl: The control.
* @notify: The callback function.
* @priv: The callback private handle, passed as argument to the callback.
*
* This function sets a callback function for the control. If @ctrl is NULL,
* then it will do nothing. If @notify is NULL, then the notify callback will
* be removed.
*
* There can be only one notify. If another already exists, then a WARN_ON
* will be issued and the function will do nothing.
*/
void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify,
void *priv);
/**
* v4l2_ctrl_get_name() - Get the name of the control
*
* @id: The control ID.
*
* This function returns the name of the given control ID or NULL if it isn't
* a known control.
*/
const char *v4l2_ctrl_get_name(u32 id);
/**
* v4l2_ctrl_get_menu() - Get the menu string array of the control
*
* @id: The control ID.
*
* This function returns the NULL-terminated menu string array name of the
* given control ID or NULL if it isn't a known menu control.
*/
const char * const *v4l2_ctrl_get_menu(u32 id);
/**
* v4l2_ctrl_get_int_menu() - Get the integer menu array of the control
*
* @id: The control ID.
* @len: The size of the integer array.
*
* This function returns the integer array of the given control ID or NULL if it
* if it isn't a known integer menu control.
*/
const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len);
/**
* v4l2_ctrl_g_ctrl() - Helper function to get the control's value from
* within a driver.
*
* @ctrl: The control.
*
* This returns the control's value safely by going through the control
* framework. This function will lock the control's handler, so it cannot be
* used from within the &v4l2_ctrl_ops functions.
*
* This function is for integer type controls only.
*/
s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
/**
* __v4l2_ctrl_s_ctrl() - Unlocked variant of v4l2_ctrl_s_ctrl().
*
* @ctrl: The control.
* @val: The new value.
*
* This sets the control's new value safely by going through the control
* framework. This function assumes the control's handler is already locked,
* allowing it to be used from within the &v4l2_ctrl_ops functions.
*
* This function is for integer type controls only.
*/
int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
/**
* v4l2_ctrl_s_ctrl() - Helper function to set the control's value from
* within a driver.
* @ctrl: The control.
* @val: The new value.
*
* This sets the control's new value safely by going through the control
* framework. This function will lock the control's handler, so it cannot be
* used from within the &v4l2_ctrl_ops functions.
*
* This function is for integer type controls only.
*/
static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
{
int rval;
v4l2_ctrl_lock(ctrl);
rval = __v4l2_ctrl_s_ctrl(ctrl, val);
v4l2_ctrl_unlock(ctrl);
return rval;
}
/**
* v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value
* from within a driver.
*
* @ctrl: The control.
*
* This returns the control's value safely by going through the control
* framework. This function will lock the control's handler, so it cannot be
* used from within the &v4l2_ctrl_ops functions.
*
* This function is for 64-bit integer type controls only.
*/
s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
/**
* __v4l2_ctrl_s_ctrl_int64() - Unlocked variant of v4l2_ctrl_s_ctrl_int64().
*
* @ctrl: The control.
* @val: The new value.
*
* This sets the control's new value safely by going through the control
* framework. This function assumes the control's handler is already locked,
* allowing it to be used from within the &v4l2_ctrl_ops functions.
*
* This function is for 64-bit integer type controls only.
*/
int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val);
/**
* v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value
* from within a driver.
*
* @ctrl: The control.
* @val: The new value.
*
* This sets the control's new value safely by going through the control
* framework. This function will lock the control's handler, so it cannot be
* used from within the &v4l2_ctrl_ops functions.
*
* This function is for 64-bit integer type controls only.
*/
static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
{
int rval;
v4l2_ctrl_lock(ctrl);
rval = __v4l2_ctrl_s_ctrl_int64(ctrl, val);
v4l2_ctrl_unlock(ctrl);
return rval;
}
/**
* __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string().
*
* @ctrl: The control.
* @s: The new string.
*
* This sets the control's new string safely by going through the control
* framework. This function assumes the control's handler is already locked,
* allowing it to be used from within the &v4l2_ctrl_ops functions.
*
* This function is for string type controls only.
*/
int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s);
/**
* v4l2_ctrl_s_ctrl_string() - Helper function to set a control's string value
* from within a driver.
*
* @ctrl: The control.
* @s: The new string.
*
* This sets the control's new string safely by going through the control
* framework. This function will lock the control's handler, so it cannot be
* used from within the &v4l2_ctrl_ops functions.
*
* This function is for string type controls only.
*/
static inline int v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
{
int rval;
v4l2_ctrl_lock(ctrl);
rval = __v4l2_ctrl_s_ctrl_string(ctrl, s);
v4l2_ctrl_unlock(ctrl);
return rval;
}
/**
* __v4l2_ctrl_s_ctrl_compound() - Unlocked variant to set a compound control
*
* @ctrl: The control.
* @type: The type of the data.
* @p: The new compound payload.
*
* This sets the control's new compound payload safely by going through the
* control framework. This function assumes the control's handler is already
* locked, allowing it to be used from within the &v4l2_ctrl_ops functions.
*
* This function is for compound type controls only.
*/
int __v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl *ctrl,
enum v4l2_ctrl_type type, const void *p);
/**
* v4l2_ctrl_s_ctrl_compound() - Helper function to set a compound control
* from within a driver.
*
* @ctrl: The control.
* @type: The type of the data.
* @p: The new compound payload.
*
* This sets the control's new compound payload safely by going through the
* control framework. This function will lock the control's handler, so it
* cannot be used from within the &v4l2_ctrl_ops functions.
*
* This function is for compound type controls only.
*/
static inline int v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl *ctrl,
enum v4l2_ctrl_type type,
const void *p)
{
int rval;
v4l2_ctrl_lock(ctrl);
rval = __v4l2_ctrl_s_ctrl_compound(ctrl, type, p);
v4l2_ctrl_unlock(ctrl);
return rval;
}
/* Helper defines for area type controls */
#define __v4l2_ctrl_s_ctrl_area(ctrl, area) \
__v4l2_ctrl_s_ctrl_compound((ctrl), V4L2_CTRL_TYPE_AREA, (area))
#define v4l2_ctrl_s_ctrl_area(ctrl, area) \
v4l2_ctrl_s_ctrl_compound((ctrl), V4L2_CTRL_TYPE_AREA, (area))
/* Internal helper functions that deal with control events. */
extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops;
/**
* v4l2_ctrl_replace - Function to be used as a callback to
* &struct v4l2_subscribed_event_ops replace\(\)
*
* @old: pointer to struct &v4l2_event with the reported
* event;
* @new: pointer to struct &v4l2_event with the modified
* event;
*/
void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new);
/**
* v4l2_ctrl_merge - Function to be used as a callback to
* &struct v4l2_subscribed_event_ops merge(\)
*
* @old: pointer to struct &v4l2_event with the reported
* event;
* @new: pointer to struct &v4l2_event with the merged
* event;
*/
void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new);
/**
* v4l2_ctrl_log_status - helper function to implement %VIDIOC_LOG_STATUS ioctl
*
* @file: pointer to struct file
* @fh: unused. Kept just to be compatible to the arguments expected by
* &struct v4l2_ioctl_ops.vidioc_log_status.
*
* Can be used as a vidioc_log_status function that just dumps all controls
* associated with the filehandle.
*/
int v4l2_ctrl_log_status(struct file *file, void *fh);
/**
* v4l2_ctrl_subscribe_event - Subscribes to an event
*
*
* @fh: pointer to struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*
* Can be used as a vidioc_subscribe_event function that just subscribes
* control events.
*/
int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub);
/**
* v4l2_ctrl_poll - function to be used as a callback to the poll()
* That just polls for control events.
*
* @file: pointer to struct file
* @wait: pointer to struct poll_table_struct
*/
__poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
/**
* v4l2_ctrl_request_setup - helper function to apply control values in a request
*
* @req: The request
* @parent: The parent control handler ('priv' in media_request_object_find())
*
* This is a helper function to call the control handler's s_ctrl callback with
* the control values contained in the request. Do note that this approach of
* applying control values in a request is only applicable to memory-to-memory
* devices.
*/
int v4l2_ctrl_request_setup(struct media_request *req,
struct v4l2_ctrl_handler *parent);
/**
* v4l2_ctrl_request_complete - Complete a control handler request object
*
* @req: The request
* @parent: The parent control handler ('priv' in media_request_object_find())
*
* This function is to be called on each control handler that may have had a
* request object associated with it, i.e. control handlers of a driver that
* supports requests.
*
* The function first obtains the values of any volatile controls in the control
* handler and attach them to the request. Then, the function completes the
* request object.
*/
void v4l2_ctrl_request_complete(struct media_request *req,
struct v4l2_ctrl_handler *parent);
/**
* v4l2_ctrl_request_hdl_find - Find the control handler in the request
*
* @req: The request
* @parent: The parent control handler ('priv' in media_request_object_find())
*
* This function finds the control handler in the request. It may return
* NULL if not found. When done, you must call v4l2_ctrl_request_put_hdl()
* with the returned handler pointer.
*
* If the request is not in state VALIDATING or QUEUED, then this function
* will always return NULL.
*
* Note that in state VALIDATING the req_queue_mutex is held, so
* no objects can be added or deleted from the request.
*
* In state QUEUED it is the driver that will have to ensure this.
*/
struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
struct v4l2_ctrl_handler *parent);
/**
* v4l2_ctrl_request_hdl_put - Put the control handler
*
* @hdl: Put this control handler
*
* This function released the control handler previously obtained from'
* v4l2_ctrl_request_hdl_find().
*/
static inline void v4l2_ctrl_request_hdl_put(struct v4l2_ctrl_handler *hdl)
{
if (hdl)
media_request_object_put(&hdl->req_obj);
}
/**
* v4l2_ctrl_request_hdl_ctrl_find() - Find a control with the given ID.
*
* @hdl: The control handler from the request.
* @id: The ID of the control to find.
*
* This function returns a pointer to the control if this control is
* part of the request or NULL otherwise.
*/
struct v4l2_ctrl *
v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
/* Helpers for ioctl_ops */
/**
* v4l2_queryctrl - Helper function to implement
* :ref:`VIDIOC_QUERYCTRL <vidioc_queryctrl>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @qc: pointer to &struct v4l2_queryctrl
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
/**
* v4l2_query_ext_ctrl - Helper function to implement
* :ref:`VIDIOC_QUERY_EXT_CTRL <vidioc_queryctrl>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @qc: pointer to &struct v4l2_query_ext_ctrl
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl,
struct v4l2_query_ext_ctrl *qc);
/**
* v4l2_querymenu - Helper function to implement
* :ref:`VIDIOC_QUERYMENU <vidioc_queryctrl>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @qm: pointer to &struct v4l2_querymenu
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
/**
* v4l2_g_ctrl - Helper function to implement
* :ref:`VIDIOC_G_CTRL <vidioc_g_ctrl>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @ctrl: pointer to &struct v4l2_control
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl);
/**
* v4l2_s_ctrl - Helper function to implement
* :ref:`VIDIOC_S_CTRL <vidioc_g_ctrl>` ioctl
*
* @fh: pointer to &struct v4l2_fh
* @hdl: pointer to &struct v4l2_ctrl_handler
*
* @ctrl: pointer to &struct v4l2_control
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
struct v4l2_control *ctrl);
/**
* v4l2_g_ext_ctrls - Helper function to implement
* :ref:`VIDIOC_G_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @vdev: pointer to &struct video_device
* @mdev: pointer to &struct media_device
* @c: pointer to &struct v4l2_ext_controls
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct video_device *vdev,
struct media_device *mdev, struct v4l2_ext_controls *c);
/**
* v4l2_try_ext_ctrls - Helper function to implement
* :ref:`VIDIOC_TRY_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @vdev: pointer to &struct video_device
* @mdev: pointer to &struct media_device
* @c: pointer to &struct v4l2_ext_controls
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl,
struct video_device *vdev,
struct media_device *mdev,
struct v4l2_ext_controls *c);
/**
* v4l2_s_ext_ctrls - Helper function to implement
* :ref:`VIDIOC_S_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl
*
* @fh: pointer to &struct v4l2_fh
* @hdl: pointer to &struct v4l2_ctrl_handler
* @vdev: pointer to &struct video_device
* @mdev: pointer to &struct media_device
* @c: pointer to &struct v4l2_ext_controls
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
struct video_device *vdev,
struct media_device *mdev,
struct v4l2_ext_controls *c);
/**
* v4l2_ctrl_subdev_subscribe_event - Helper function to implement
* as a &struct v4l2_subdev_core_ops subscribe_event function
* that just subscribes control events.
*
* @sd: pointer to &struct v4l2_subdev
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*/
int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
/**
* v4l2_ctrl_subdev_log_status - Log all controls owned by subdev's control
* handler.
*
* @sd: pointer to &struct v4l2_subdev
*/
int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd);
/**
* v4l2_ctrl_new_fwnode_properties() - Register controls for the device
* properties
*
* @hdl: pointer to &struct v4l2_ctrl_handler to register controls on
* @ctrl_ops: pointer to &struct v4l2_ctrl_ops to register controls with
* @p: pointer to &struct v4l2_fwnode_device_properties
*
* This function registers controls associated to device properties, using the
* property values contained in @p parameter, if the property has been set to
* a value.
*
* Currently the following v4l2 controls are parsed and registered:
* - V4L2_CID_CAMERA_ORIENTATION
* - V4L2_CID_CAMERA_SENSOR_ROTATION;
*
* Controls already registered by the caller with the @hdl control handler are
* not overwritten. Callers should register the controls they want to handle
* themselves before calling this function.
*
* Return: 0 on success, a negative error code on failure.
*/
int v4l2_ctrl_new_fwnode_properties(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ctrl_ops,
const struct v4l2_fwnode_device_properties *p);
#endif
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