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![Jacopo Mondi](/assets/img/avatar_default.png)
Add an helper function to v4l2-ctrls to register controls associated with a device property. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
1457 lines
49 KiB
C
1457 lines
49 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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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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#ifndef _V4L2_CTRLS_H
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#define _V4L2_CTRLS_H
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/videodev2.h>
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#include <media/media-request.h>
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/*
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* Include the stateless codec compound control definitions.
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* This will move to the public headers once this API is fully stable.
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*/
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#include <media/mpeg2-ctrls.h>
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#include <media/fwht-ctrls.h>
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#include <media/h264-ctrls.h>
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#include <media/vp8-ctrls.h>
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#include <media/hevc-ctrls.h>
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/* forward references */
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struct file;
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struct poll_table_struct;
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struct v4l2_ctrl;
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struct v4l2_ctrl_handler;
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struct v4l2_ctrl_helper;
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struct v4l2_fh;
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struct v4l2_fwnode_device_properties;
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struct v4l2_subdev;
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struct v4l2_subscribed_event;
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struct video_device;
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/**
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* union v4l2_ctrl_ptr - A pointer to a control value.
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* @p_s32: Pointer to a 32-bit signed value.
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* @p_s64: Pointer to a 64-bit signed value.
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* @p_u8: Pointer to a 8-bit unsigned value.
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* @p_u16: Pointer to a 16-bit unsigned value.
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* @p_u32: Pointer to a 32-bit unsigned value.
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* @p_char: Pointer to a string.
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* @p_mpeg2_slice_params: Pointer to a MPEG2 slice parameters structure.
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* @p_mpeg2_quantization: Pointer to a MPEG2 quantization data structure.
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* @p_fwht_params: Pointer to a FWHT stateless parameters structure.
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* @p_h264_sps: Pointer to a struct v4l2_ctrl_h264_sps.
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* @p_h264_pps: Pointer to a struct v4l2_ctrl_h264_pps.
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* @p_h264_scaling_matrix: Pointer to a struct v4l2_ctrl_h264_scaling_matrix.
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* @p_h264_slice_params: Pointer to a struct v4l2_ctrl_h264_slice_params.
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* @p_h264_decode_params: Pointer to a struct v4l2_ctrl_h264_decode_params.
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* @p_vp8_frame_header: Pointer to a VP8 frame header structure.
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* @p_hevc_sps: Pointer to an HEVC sequence parameter set structure.
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* @p_hevc_pps: Pointer to an HEVC picture parameter set structure.
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* @p_hevc_slice_params: Pointer to an HEVC slice parameters structure.
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* @p_area: Pointer to an area.
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* @p: Pointer to a compound value.
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* @p_const: Pointer to a constant compound value.
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*/
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union v4l2_ctrl_ptr {
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s32 *p_s32;
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s64 *p_s64;
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u8 *p_u8;
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u16 *p_u16;
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u32 *p_u32;
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char *p_char;
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struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
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struct v4l2_ctrl_mpeg2_quantization *p_mpeg2_quantization;
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struct v4l2_ctrl_fwht_params *p_fwht_params;
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struct v4l2_ctrl_h264_sps *p_h264_sps;
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struct v4l2_ctrl_h264_pps *p_h264_pps;
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struct v4l2_ctrl_h264_scaling_matrix *p_h264_scaling_matrix;
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struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
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struct v4l2_ctrl_h264_decode_params *p_h264_decode_params;
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struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
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struct v4l2_ctrl_hevc_sps *p_hevc_sps;
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struct v4l2_ctrl_hevc_pps *p_hevc_pps;
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struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
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struct v4l2_area *p_area;
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void *p;
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const void *p_const;
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};
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/**
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* v4l2_ctrl_ptr_create() - Helper function to return a v4l2_ctrl_ptr from a
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* void pointer
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* @ptr: The void pointer
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*/
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static inline union v4l2_ctrl_ptr v4l2_ctrl_ptr_create(void *ptr)
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{
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union v4l2_ctrl_ptr p = { .p = ptr };
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return p;
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}
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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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* continuously.
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* If not set, then the currently cached value will be returned.
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* @try_ctrl: Test whether the control's value is valid. Only relevant when
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* the usual min/max/step checks are not sufficient.
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* @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The
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* ctrl->handler->lock is held when these ops are called, so no
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* one else can access controls owned by that handler.
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*/
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struct v4l2_ctrl_ops {
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int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
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int (*try_ctrl)(struct v4l2_ctrl *ctrl);
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int (*s_ctrl)(struct v4l2_ctrl *ctrl);
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};
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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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*
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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
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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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union v4l2_ctrl_ptr ptr1,
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union v4l2_ctrl_ptr ptr2);
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void (*init)(const struct v4l2_ctrl *ctrl, u32 idx,
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union v4l2_ctrl_ptr ptr);
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void (*log)(const struct v4l2_ctrl *ctrl);
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int (*validate)(const struct v4l2_ctrl *ctrl, u32 idx,
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union v4l2_ctrl_ptr ptr);
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};
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/**
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* typedef v4l2_ctrl_notify_fnc - typedef for a notify argument with a function
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* that should be called when a control value has changed.
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*
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* @ctrl: pointer to struct &v4l2_ctrl
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* @priv: control private data
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*
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* This typedef definition is used as an argument to v4l2_ctrl_notify()
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* and as an argument at struct &v4l2_ctrl_handler.
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*/
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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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* @cluster: Point to start of cluster array.
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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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* 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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* @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. Drivers can set
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* this flag.
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* @is_auto: If set, then this control selects whether the other cluster
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* members are in 'automatic' mode or 'manual' mode. This is
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* used for autogain/gain type clusters. Drivers should never
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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 >=
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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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* Drivers should never touch this flag.
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* @call_notify: If set, then call the handler's notify function whenever the
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* control's value changes.
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* @manual_mode_value: If the is_auto flag is set, then this is the value
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* of the auto control that determines if that control is in
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* manual mode. So if the value of the auto control equals this
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* value, then the whole cluster is in manual mode. Drivers should
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* never set this flag directly.
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* @ops: The control ops.
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* @type_ops: The control type ops.
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* @id: The control ID.
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* @name: The control name.
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* @type: The control type.
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* @minimum: The control's minimum value.
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* @maximum: The control's maximum value.
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* @default_value: The control's default value.
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* @step: The control's step value for non-menu controls.
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* @elems: The number of elements in the N-dimensional array.
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* @elem_size: The size in bytes of the control.
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* @dims: The size of each dimension.
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* @nr_of_dims:The number of dimensions in @dims.
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* @menu_skip_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 <= 32 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 u64 or a bit array.
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* @qmenu: A const char * array for all menu items. Array entries that are
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* empty strings ("") correspond to non-existing menu items (this
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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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* Used only if the @type is %V4L2_CTRL_TYPE_MENU.
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* @qmenu_int: A 64-bit integer array for with integer menu items.
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* The size of array must be equal to the menu size, e. g.:
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* :math:`ceil(\frac{maximum - minimum}{step}) + 1`.
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* Used only if the @type is %V4L2_CTRL_TYPE_INTEGER_MENU.
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* @flags: The control's flags.
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* @cur: Structure to store the current value.
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* @cur.val: The control's current value, if the @type is represented via
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* a u32 integer (see &enum v4l2_ctrl_type).
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* @val: The control's new s32 value.
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* @priv: The control's private pointer. For use by the driver. It is
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* untouched by the control framework. Note that this pointer is
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* not freed when the control is deleted. Should this be needed
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* then a new internal bitfield can be added to tell the framework
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* to free this pointer.
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* @p_def: The control's default value represented via a union which
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* provides a standard way of accessing control types
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* through a pointer (for compound controls only).
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* @p_cur: The control's current value represented via a union which
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* provides a standard way of accessing control types
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* through a pointer.
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* @p_new: The control's new value represented via a union which provides
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* a standard way of accessing control types
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* through a pointer.
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*/
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struct v4l2_ctrl {
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/* Administrative fields */
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struct list_head node;
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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 int ncontrols;
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unsigned int done:1;
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unsigned int is_new:1;
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unsigned int has_changed:1;
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unsigned int is_private:1;
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unsigned int is_auto:1;
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unsigned int is_int:1;
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unsigned int is_string:1;
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unsigned int is_ptr:1;
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unsigned int is_array:1;
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unsigned int has_volatiles:1;
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unsigned int call_notify:1;
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unsigned int manual_mode_value:8;
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const struct v4l2_ctrl_ops *ops;
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const struct v4l2_ctrl_type_ops *type_ops;
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u32 id;
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const char *name;
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enum v4l2_ctrl_type type;
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s64 minimum, maximum, default_value;
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u32 elems;
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u32 elem_size;
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u32 dims[V4L2_CTRL_MAX_DIMS];
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u32 nr_of_dims;
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union {
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u64 step;
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u64 menu_skip_mask;
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};
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union {
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const char * const *qmenu;
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const s64 *qmenu_int;
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};
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unsigned long flags;
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void *priv;
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s32 val;
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struct {
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s32 val;
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} cur;
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union v4l2_ctrl_ptr p_def;
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union v4l2_ctrl_ptr p_new;
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union v4l2_ctrl_ptr p_cur;
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};
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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
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* ``prepare_ext_ctrls`` function at ``v4l2-ctrl.c``.
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* @from_other_dev: If true, then @ctrl was defined in another
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* device than the &struct v4l2_ctrl_handler.
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* @req_done: Internal flag: if the control handler containing this control
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* reference is bound to a media request, then this is set when
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* the control has been applied. This prevents applying controls
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* from a cluster with multiple controls twice (when the first
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* control of a cluster is applied, they all are).
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* @req: If set, this refers to another request that sets this control.
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* @p_req: If the control handler containing this control reference
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* is bound to a media request, then this points to the
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* value of the control that should be applied when the request
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* is executed, or to the value of the control at the time
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* that the request was completed.
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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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* is used to link the control in the hash's bucket.
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*/
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struct v4l2_ctrl_ref {
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struct list_head node;
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struct v4l2_ctrl_ref *next;
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struct v4l2_ctrl *ctrl;
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struct v4l2_ctrl_helper *helper;
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bool from_other_dev;
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bool req_done;
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struct v4l2_ctrl_ref *req;
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union v4l2_ctrl_ptr p_req;
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};
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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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*
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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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* @ctrls: The list of controls owned by this handler.
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* @ctrl_refs: The list of control references.
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* @cached: The last found control reference. It is common that the same
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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
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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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* @nr_of_buckets: Total number of buckets in the array.
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* @error: The error code of the first failed control addition.
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* @request_is_queued: True if the request was queued.
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* @requests: List to keep track of open control handler request objects.
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* For the parent control handler (@req_obj.req == NULL) this
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* is the list header. When the parent control handler is
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* removed, it has to unbind and put all these requests since
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* they refer to the parent.
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* @requests_queued: List of the queued requests. This determines the order
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* in which these controls are applied. Once the request is
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* completed it is removed from this list.
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* @req_obj: The &struct media_request_object, used to link into a
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* &struct media_request. This request object has a refcount.
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*/
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struct v4l2_ctrl_handler {
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struct mutex _lock;
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struct mutex *lock;
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struct list_head ctrls;
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struct list_head ctrl_refs;
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struct v4l2_ctrl_ref *cached;
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struct v4l2_ctrl_ref **buckets;
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v4l2_ctrl_notify_fnc notify;
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void *notify_priv;
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u16 nr_of_buckets;
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int error;
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bool request_is_queued;
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struct list_head requests;
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struct list_head requests_queued;
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struct media_request_object req_obj;
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};
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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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* @name: The control name.
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* @type: The control type.
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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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* @p_def: The control's default value for compound controls.
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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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* @menu_skip_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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* @qmenu: A const char * array for all menu items. Array entries that are
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* empty strings ("") correspond to non-existing menu items (this
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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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* @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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struct v4l2_ctrl_config {
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const struct v4l2_ctrl_ops *ops;
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const struct v4l2_ctrl_type_ops *type_ops;
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u32 id;
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const char *name;
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enum v4l2_ctrl_type type;
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s64 min;
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s64 max;
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u64 step;
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s64 def;
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union v4l2_ctrl_ptr p_def;
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u32 dims[V4L2_CTRL_MAX_DIMS];
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u32 elem_size;
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u32 flags;
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u64 menu_skip_mask;
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|
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_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
|