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[media] v4l2-ctrls.h: fully document the header file
There are lots of undocumented stuff on this header. Document them. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
6d85d7d7eb
commit
8ec4bee7c1
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@ -1,21 +1,17 @@
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/*
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V4L2 controls support header.
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Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* V4L2 controls support header.
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*
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* Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _V4L2_CTRLS_H
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@ -58,6 +54,7 @@ union v4l2_ctrl_ptr {
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/**
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* struct v4l2_ctrl_ops - The control operations that the driver has to provide.
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*
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* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
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* for volatile (and usually read-only) controls such as a control
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* that returns the current signal strength which changes
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@ -77,12 +74,13 @@ struct v4l2_ctrl_ops {
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/**
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* struct v4l2_ctrl_type_ops - The control type operations that the driver
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* has to provide.
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* has to provide.
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*
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* @equal: return true if both values are equal.
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* @init: initialize the value.
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* @log: log the value.
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* @validate: validate the value. Return 0 on success and a negative value otherwise.
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* @validate: validate the value. Return 0 on success and a negative value
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* otherwise.
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*/
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struct v4l2_ctrl_type_ops {
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bool (*equal)(const struct v4l2_ctrl *ctrl, u32 idx,
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@ -99,6 +97,7 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
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/**
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* struct v4l2_ctrl - The control structure.
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*
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* @node: The list node.
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* @ev_subs: The list of control event subscriptions.
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* @handler: The handler that owns the control.
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@ -106,7 +105,7 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
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* @ncontrols: Number of controls in cluster array.
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* @done: Internal flag: set for each processed control.
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* @is_new: Set when the user specified a new value for this control. It
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* is also set when called from v4l2_ctrl_handler_setup. Drivers
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* is also set when called from v4l2_ctrl_handler_setup(). Drivers
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* should never set this flag.
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* @has_changed: Set when the current value differs from the new value. Drivers
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* should never use this flag.
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@ -119,9 +118,10 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
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* set this flag directly.
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* @is_int: If set, then this control has a simple integer value (i.e. it
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* uses ctrl->val).
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* @is_string: If set, then this control has type V4L2_CTRL_TYPE_STRING.
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* @is_ptr: If set, then this control is an array and/or has type >= V4L2_CTRL_COMPOUND_TYPES
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* and/or has type V4L2_CTRL_TYPE_STRING. In other words, struct
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* @is_string: If set, then this control has type %V4L2_CTRL_TYPE_STRING.
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* @is_ptr: If set, then this control is an array and/or has type >=
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* %V4L2_CTRL_COMPOUND_TYPES
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* and/or has type %V4L2_CTRL_TYPE_STRING. In other words, &struct
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* v4l2_ext_control uses field p to point to the data.
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* @is_array: If set, then this control contains an N-dimensional array.
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* @has_volatiles: If set, then one or more members of the cluster are volatile.
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@ -177,7 +177,8 @@ struct v4l2_ctrl {
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struct list_head ev_subs;
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struct v4l2_ctrl_handler *handler;
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struct v4l2_ctrl **cluster;
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unsigned ncontrols;
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unsigned int ncontrols;
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unsigned int done:1;
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unsigned int is_new:1;
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@ -223,10 +224,12 @@ struct v4l2_ctrl {
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/**
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* struct v4l2_ctrl_ref - The control reference.
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*
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* @node: List node for the sorted list.
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* @next: Single-link list node for the hash.
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* @ctrl: The actual control information.
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* @helper: Pointer to helper struct. Used internally in prepare_ext_ctrls().
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* @helper: Pointer to helper struct. Used internally in
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* prepare_ext_ctrls().
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*
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* Each control handler has a list of these refs. The list_head is used to
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* keep a sorted-by-control-ID list of all controls, while the next pointer
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@ -241,8 +244,9 @@ struct v4l2_ctrl_ref {
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/**
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* struct v4l2_ctrl_handler - The control handler keeps track of all the
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* controls: both the controls owned by the handler and those inherited
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* from other handlers.
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* controls: both the controls owned by the handler and those inherited
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* from other handlers.
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*
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* @_lock: Default for "lock".
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* @lock: Lock to control access to this handler and its controls.
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* May be replaced by the user right after init.
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@ -252,7 +256,8 @@ struct v4l2_ctrl_ref {
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* control is needed multiple times, so this is a simple
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* optimization.
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* @buckets: Buckets for the hashing. Allows for quick control lookup.
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* @notify: A notify callback that is called whenever the control changes value.
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* @notify: A notify callback that is called whenever the control changes
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* value.
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* Note that the handler's lock is held when the notify function
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* is called!
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* @notify_priv: Passed as argument to the v4l2_ctrl notify callback.
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@ -274,6 +279,7 @@ struct v4l2_ctrl_handler {
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/**
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* struct v4l2_ctrl_config - Control configuration structure.
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*
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* @ops: The control ops.
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* @type_ops: The control type ops. Only needed for compound controls.
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* @id: The control ID.
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@ -282,7 +288,7 @@ struct v4l2_ctrl_handler {
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* @min: The control's minimum value.
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* @max: The control's maximum value.
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* @step: The control's step value for non-menu controls.
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* @def: The control's default value.
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* @def: The control's default value.
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* @dims: The size of each dimension.
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* @elem_size: The size in bytes of the control.
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* @flags: The control's flags.
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@ -297,7 +303,7 @@ struct v4l2_ctrl_handler {
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* is in addition to the menu_skip_mask above). The last entry
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* must be NULL.
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* @qmenu_int: A const s64 integer array for all menu items of the type
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* V4L2_CTRL_TYPE_INTEGER_MENU.
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* V4L2_CTRL_TYPE_INTEGER_MENU.
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* @is_private: If set, then this control is private to its handler and it
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* will not be added to any other handlers.
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*/
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@ -320,20 +326,31 @@ struct v4l2_ctrl_config {
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unsigned int is_private:1;
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};
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/*
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* v4l2_ctrl_fill() - Fill in the control fields based on the control ID.
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/**
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* v4l2_ctrl_fill - Fill in the control fields based on the control ID.
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*
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* @id: ID of the control
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* @name: name of the control
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* @type: type of the control
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* @min: minimum value for the control
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* @max: maximum value for the control
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* @step: control step
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* @def: default value for the control
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* @flags: flags to be used on the control
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*
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* This works for all standard V4L2 controls.
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* For non-standard controls it will only fill in the given arguments
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* and @name will be NULL.
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* and @name will be %NULL.
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*
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* This function will overwrite the contents of @name, @type and @flags.
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* The contents of @min, @max, @step and @def may be modified depending on
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* the type.
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*
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* Do not use in drivers! It is used internally for backwards compatibility
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* control handling only. Once all drivers are converted to use the new
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* control framework this function will no longer be exported.
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* .. note::
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*
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* Do not use in drivers! It is used internally for backwards compatibility
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* control handling only. Once all drivers are converted to use the new
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* control framework this function will no longer be exported.
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*/
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void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
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s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags);
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@ -359,7 +376,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
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* macro that hides the @key and @name arguments.
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*/
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int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
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unsigned nr_of_controls_hint,
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unsigned int nr_of_controls_hint,
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struct lock_class_key *key, const char *name);
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#ifdef CONFIG_LOCKDEP
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@ -436,7 +453,8 @@ void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
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/**
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* v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2
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* control.
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* control.
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*
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* @hdl: The control handler.
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* @cfg: The control's configuration data.
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* @priv: The control's driver-specific private data.
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@ -445,17 +463,20 @@ void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
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* and @hdl->error is set to the error code (if it wasn't set already).
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*/
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struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
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const struct v4l2_ctrl_config *cfg, void *priv);
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const struct v4l2_ctrl_config *cfg,
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void *priv);
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/**
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* v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu control.
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* v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu
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* control.
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*
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* @hdl: The control handler.
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* @ops: The control ops.
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* @id: The control ID.
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* @id: The control ID.
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* @min: The control's minimum value.
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* @max: The control's maximum value.
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* @step: The control's step value
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* @def: The control's default value.
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* @def: The control's default value.
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*
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* If the &v4l2_ctrl struct could not be allocated, or the control
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* ID is not known, then NULL is returned and @hdl->error is set to the
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@ -466,22 +487,25 @@ struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
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* Use v4l2_ctrl_new_std_menu() when adding menu controls.
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*/
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struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
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const struct v4l2_ctrl_ops *ops,
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u32 id, s64 min, s64 max, u64 step, s64 def);
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const struct v4l2_ctrl_ops *ops,
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u32 id, s64 min, s64 max, u64 step,
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s64 def);
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/**
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* v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 menu control.
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* v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2
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* menu control.
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*
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* @hdl: The control handler.
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* @ops: The control ops.
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* @id: The control ID.
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* @id: The control ID.
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* @max: The control's maximum value.
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* @mask: The control's skip mask for menu controls. This makes it
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* @mask: The control's skip mask for menu controls. This makes it
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* easy to skip menu items that are not valid. If bit X is set,
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* then menu item X is skipped. Of course, this only works for
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* menus with <= 64 menu items. There are no menus that come
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* close to that number, so this is OK. Should we ever need more,
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* then this will have to be extended to a bit array.
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* @def: The control's default value.
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* @def: The control's default value.
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*
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* Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value
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* determines which menu items are to be skipped.
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@ -489,12 +513,13 @@ struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
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* If @id refers to a non-menu control, then this function will return NULL.
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*/
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struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
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const struct v4l2_ctrl_ops *ops,
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u32 id, u8 max, u64 mask, u8 def);
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const struct v4l2_ctrl_ops *ops,
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u32 id, u8 max, u64 mask, u8 def);
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/**
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* v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control
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* with driver specific menu.
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* with driver specific menu.
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*
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* @hdl: The control handler.
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* @ops: The control ops.
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* @id: The control ID.
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@ -513,11 +538,14 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
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*
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*/
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struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
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const struct v4l2_ctrl_ops *ops, u32 id, u8 max,
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u64 mask, u8 def, const char * const *qmenu);
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const struct v4l2_ctrl_ops *ops,
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u32 id, u8 max,
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u64 mask, u8 def,
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const char * const *qmenu);
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/**
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* v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control.
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*
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* @hdl: The control handler.
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* @ops: The control ops.
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* @id: The control ID.
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@ -528,17 +556,20 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
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* Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly
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* takes as an argument an array of integers determining the menu items.
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*
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* If @id refers to a non-integer-menu control, then this function will return NULL.
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* If @id refers to a non-integer-menu control, then this function will
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* return %NULL.
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*/
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struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
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const struct v4l2_ctrl_ops *ops,
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u32 id, u8 max, u8 def, const s64 *qmenu_int);
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const struct v4l2_ctrl_ops *ops,
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u32 id, u8 max, u8 def,
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const s64 *qmenu_int);
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typedef bool (*v4l2_ctrl_filter)(const struct v4l2_ctrl *ctrl);
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/**
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* v4l2_ctrl_add_handler() - Add all controls from handler @add to
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* handler @hdl.
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* handler @hdl.
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*
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* @hdl: The control handler.
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* @add: The control handler whose controls you want to add to
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* the @hdl control handler.
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@ -556,6 +587,7 @@ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
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/**
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* v4l2_ctrl_radio_filter() - Standard filter for radio controls.
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*
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* @ctrl: The control that is filtered.
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*
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* This will return true for any controls that are valid for radio device
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@ -567,16 +599,19 @@ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
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bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl);
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/**
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* v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster.
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* v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging
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* to that cluster.
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*
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* @ncontrols: The number of controls in this cluster.
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* @controls: The cluster control array of size @ncontrols.
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* @controls: The cluster control array of size @ncontrols.
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*/
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void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls);
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void v4l2_ctrl_cluster(unsigned int ncontrols, struct v4l2_ctrl **controls);
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/**
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* v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging to
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* that cluster and set it up for autofoo/foo-type handling.
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* v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging
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* to that cluster and set it up for autofoo/foo-type handling.
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*
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* @ncontrols: The number of controls in this cluster.
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* @controls: The cluster control array of size @ncontrols. The first control
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* must be the 'auto' control (e.g. autogain, autoexposure, etc.)
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@ -604,12 +639,14 @@ void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls);
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* on the autofoo control and V4L2_CTRL_FLAG_INACTIVE on the foo control(s)
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* if autofoo is in auto mode.
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*/
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void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
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u8 manual_val, bool set_volatile);
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void v4l2_ctrl_auto_cluster(unsigned int ncontrols,
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struct v4l2_ctrl **controls,
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u8 manual_val, bool set_volatile);
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/**
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* v4l2_ctrl_find() - Find a control with the given ID.
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*
|
||||
* @hdl: The control handler.
|
||||
* @id: The control ID to find.
|
||||
*
|
||||
|
|
@ -634,6 +671,7 @@ void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
|
|||
|
||||
/**
|
||||
* 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.
|
||||
*
|
||||
|
|
@ -673,6 +711,7 @@ int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
|
|||
|
||||
/**
|
||||
* 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.
|
||||
|
|
@ -703,6 +742,7 @@ static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
|
|||
|
||||
/**
|
||||
* 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.
|
||||
|
|
@ -714,10 +754,12 @@ static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
|
|||
* 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);
|
||||
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
|
||||
|
|
@ -727,6 +769,7 @@ 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
|
||||
|
|
@ -736,6 +779,7 @@ 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.
|
||||
*
|
||||
|
|
@ -745,7 +789,9 @@ const char * const *v4l2_ctrl_get_menu(u32 id);
|
|||
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.
|
||||
* 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
|
||||
|
|
@ -758,8 +804,9 @@ 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.
|
||||
* @val: TheControls name 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,
|
||||
|
|
@ -769,7 +816,9 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
|
|||
*/
|
||||
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.
|
||||
/**
|
||||
* v4l2_ctrl_s_ctrl() - Helper function to set the control's value from
|
||||
* within a driver.
|
||||
* @ctrl: The control.
|
||||
* @val: The new value.
|
||||
*
|
||||
|
|
@ -793,6 +842,7 @@ static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
|
|||
/**
|
||||
* 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
|
||||
|
|
@ -817,7 +867,8 @@ s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
|
|||
*/
|
||||
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
|
||||
/**
|
||||
* v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value
|
||||
* from within a driver.
|
||||
*
|
||||
* @ctrl: The control.
|
||||
|
|
@ -840,7 +891,8 @@ static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
|
|||
return rval;
|
||||
}
|
||||
|
||||
/** __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string().
|
||||
/**
|
||||
* __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string().
|
||||
*
|
||||
* @ctrl: The control.
|
||||
* @s: The new string.
|
||||
|
|
@ -853,12 +905,13 @@ static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
|
|||
*/
|
||||
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
|
||||
/**
|
||||
* 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.
|
||||
*
|
||||
*Controls name
|
||||
* 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.
|
||||
|
|
@ -878,39 +931,179 @@ static inline int v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
|
|||
|
||||
/* 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 :ref:`struct v4l2_event <v4l2-event>` with the reported
|
||||
* event;
|
||||
* @new: pointer to :ref:`struct v4l2_event <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 :ref:`struct v4l2_event <v4l2-event>` with the reported
|
||||
* event;
|
||||
* @new: pointer to :ref:`struct v4l2_event <v4l2-event>` with the merged
|
||||
* event;
|
||||
*/
|
||||
void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new);
|
||||
|
||||
/* Can be used as a vidioc_log_status function that just dumps all controls
|
||||
associated with the filehandle. */
|
||||
/**
|
||||
* 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);
|
||||
|
||||
/* Can be used as a vidioc_subscribe_event function that just subscribes
|
||||
control events. */
|
||||
/**
|
||||
* 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);
|
||||
|
||||
/* Can be used as a poll function that just polls for control events. */
|
||||
/**
|
||||
* 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
|
||||
*/
|
||||
unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
|
||||
|
||||
/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
|
||||
int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
|
||||
int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc);
|
||||
int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
|
||||
int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl);
|
||||
int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
|
||||
struct v4l2_control *ctrl);
|
||||
int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
|
||||
int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
|
||||
int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
|
||||
struct v4l2_ext_controls *c);
|
||||
/* Helpers for ioctl_ops */
|
||||
|
||||
/* Can be used as a subscribe_event function that just subscribes control
|
||||
events. */
|
||||
/**
|
||||
* 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
|
||||
* @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 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
|
||||
* @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 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
|
||||
* @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 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);
|
||||
|
||||
/* Log all controls owned by subdev's control handler. */
|
||||
/**
|
||||
* 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);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue