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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+.. c:namespace:: V4L
+
+.. _VIDIOC_G_EXT_CTRLS:
+
+******************************************************************
+ioctl VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, VIDIOC_TRY_EXT_CTRLS
+******************************************************************
+
+Name
+====
+
+VIDIOC_G_EXT_CTRLS - VIDIOC_S_EXT_CTRLS - VIDIOC_TRY_EXT_CTRLS - Get or set the value of several controls, try control values
+
+Synopsis
+========
+
+.. c:macro:: VIDIOC_G_EXT_CTRLS
+
+``int ioctl(int fd, VIDIOC_G_EXT_CTRLS, struct v4l2_ext_controls *argp)``
+
+.. c:macro:: VIDIOC_S_EXT_CTRLS
+
+``int ioctl(int fd, VIDIOC_S_EXT_CTRLS, struct v4l2_ext_controls *argp)``
+
+.. c:macro:: VIDIOC_TRY_EXT_CTRLS
+
+``int ioctl(int fd, VIDIOC_TRY_EXT_CTRLS, struct v4l2_ext_controls *argp)``
+
+Arguments
+=========
+
+``fd``
+ File descriptor returned by :c:func:`open()`.
+
+``argp``
+ Pointer to struct :c:type:`v4l2_ext_controls`.
+
+Description
+===========
+
+These ioctls allow the caller to get or set multiple controls
+atomically. Control IDs are grouped into control classes (see
+:ref:`ctrl-class`) and all controls in the control array must belong
+to the same control class.
+
+Applications must always fill in the ``count``, ``which``, ``controls``
+and ``reserved`` fields of struct
+:c:type:`v4l2_ext_controls`, and initialize the
+struct :c:type:`v4l2_ext_control` array pointed to
+by the ``controls`` fields.
+
+To get the current value of a set of controls applications initialize
+the ``id``, ``size`` and ``reserved2`` fields of each struct
+:c:type:`v4l2_ext_control` and call the
+:ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctl. String controls must also set the
+``string`` field. Controls of compound types
+(``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set) must set the ``ptr`` field.
+
+If the ``size`` is too small to receive the control result (only
+relevant for pointer-type controls like strings), then the driver will
+set ``size`` to a valid value and return an ``ENOSPC`` error code. You
+should re-allocate the memory to this new size and try again. For the
+string type it is possible that the same issue occurs again if the
+string has grown in the meantime. It is recommended to call
+:ref:`VIDIOC_QUERYCTRL` first and use
+``maximum``\ +1 as the new ``size`` value. It is guaranteed that that is
+sufficient memory.
+
+N-dimensional arrays are set and retrieved row-by-row. You cannot set a
+partial array, all elements have to be set or retrieved. The total size
+is calculated as ``elems`` * ``elem_size``. These values can be obtained
+by calling :ref:`VIDIOC_QUERY_EXT_CTRL <VIDIOC_QUERYCTRL>`.
+
+To change the value of a set of controls applications initialize the
+``id``, ``size``, ``reserved2`` and ``value/value64/string/ptr`` fields
+of each struct :c:type:`v4l2_ext_control` and call
+the :ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctl. The controls will only be set if *all*
+control values are valid.
+
+To check if a set of controls have correct values applications
+initialize the ``id``, ``size``, ``reserved2`` and
+``value/value64/string/ptr`` fields of each struct
+:c:type:`v4l2_ext_control` and call the
+:ref:`VIDIOC_TRY_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctl. It is up to the driver whether wrong
+values are automatically adjusted to a valid value or if an error is
+returned.
+
+When the ``id`` or ``which`` is invalid drivers return an ``EINVAL`` error
+code. When the value is out of bounds drivers can choose to take the
+closest valid value or return an ``ERANGE`` error code, whatever seems more
+appropriate. In the first case the new value is set in struct
+:c:type:`v4l2_ext_control`. If the new control value
+is inappropriate (e.g. the given menu index is not supported by the menu
+control), then this will also result in an ``EINVAL`` error code error.
+
+If ``request_fd`` is set to a not-yet-queued :ref:`request <media-request-api>`
+file descriptor and ``which`` is set to ``V4L2_CTRL_WHICH_REQUEST_VAL``,
+then the controls are not applied immediately when calling
+:ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>`, but instead are applied by
+the driver for the buffer associated with the same request.
+If the device does not support requests, then ``EACCES`` will be returned.
+If requests are supported but an invalid request file descriptor is given,
+then ``EINVAL`` will be returned.
+
+An attempt to call :ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` for a
+request that has already been queued will result in an ``EBUSY`` error.
+
+If ``request_fd`` is specified and ``which`` is set to
+``V4L2_CTRL_WHICH_REQUEST_VAL`` during a call to
+:ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>`, then it will return the
+values of the controls at the time of request completion.
+If the request is not yet completed, then this will result in an
+``EACCES`` error.
+
+The driver will only set/get these controls if all control values are
+correct. This prevents the situation where only some of the controls
+were set/get. Only low-level errors (e. g. a failed i2c command) can
+still cause this situation.
+
+.. tabularcolumns:: |p{6.8cm}|p{4.0cm}|p{6.5cm}|
+
+.. c:type:: v4l2_ext_control
+
+.. raw:: latex
+
+ \footnotesize
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ext_control
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u32
+ - ``id``
+ - Identifies the control, set by the application.
+ * - __u32
+ - ``size``
+ - The total size in bytes of the payload of this control.
+ * - :cspan:`2` The ``size`` field is normally 0, but for pointer
+ controls this should be set to the size of the memory that contains
+ the payload or that will receive the payload.
+ If :ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` finds that this value
+ is less than is required to store the payload result, then it is set
+ to a value large enough to store the payload result and ``ENOSPC`` is
+ returned.
+
+ .. note::
+
+ For string controls, this ``size`` field should
+ not be confused with the length of the string. This field refers
+ to the size of the memory that contains the string. The actual
+ *length* of the string may well be much smaller.
+ * - __u32
+ - ``reserved2``\ [1]
+ - Reserved for future extensions. Drivers and applications must set
+ the array to zero.
+ * - union {
+ - (anonymous)
+ * - __s32
+ - ``value``
+ - New value or current value. Valid if this control is not of type
+ ``V4L2_CTRL_TYPE_INTEGER64`` and ``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is
+ not set.
+ * - __s64
+ - ``value64``
+ - New value or current value. Valid if this control is of type
+ ``V4L2_CTRL_TYPE_INTEGER64`` and ``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is
+ not set.
+ * - char *
+ - ``string``
+ - A pointer to a string. Valid if this control is of type
+ ``V4L2_CTRL_TYPE_STRING``.
+ * - __u8 *
+ - ``p_u8``
+ - A pointer to a matrix control of unsigned 8-bit values. Valid if
+ this control is of type ``V4L2_CTRL_TYPE_U8``.
+ * - __u16 *
+ - ``p_u16``
+ - A pointer to a matrix control of unsigned 16-bit values. Valid if
+ this control is of type ``V4L2_CTRL_TYPE_U16``.
+ * - __u32 *
+ - ``p_u32``
+ - A pointer to a matrix control of unsigned 32-bit values. Valid if
+ this control is of type ``V4L2_CTRL_TYPE_U32``.
+ * - __s32 *
+ - ``p_s32``
+ - A pointer to a matrix control of signed 32-bit values. Valid if
+ this control is of type ``V4L2_CTRL_TYPE_INTEGER`` and
+ ``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set.
+ * - __s64 *
+ - ``p_s64``
+ - A pointer to a matrix control of signed 64-bit values. Valid if
+ this control is of type ``V4L2_CTRL_TYPE_INTEGER64`` and
+ ``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set.
+ * - struct :c:type:`v4l2_area` *
+ - ``p_area``
+ - A pointer to a struct :c:type:`v4l2_area`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_AREA``.
+ * - struct :c:type:`v4l2_ctrl_h264_sps` *
+ - ``p_h264_sps``
+ - A pointer to a struct :c:type:`v4l2_ctrl_h264_sps`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_H264_SPS``.
+ * - struct :c:type:`v4l2_ctrl_h264_pps` *
+ - ``p_h264_pps``
+ - A pointer to a struct :c:type:`v4l2_ctrl_h264_pps`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_H264_PPS``.
+ * - struct :c:type:`v4l2_ctrl_h264_scaling_matrix` *
+ - ``p_h264_scaling_matrix``
+ - A pointer to a struct :c:type:`v4l2_ctrl_h264_scaling_matrix`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_H264_SCALING_MATRIX``.
+ * - struct :c:type:`v4l2_ctrl_h264_pred_weights` *
+ - ``p_h264_pred_weights``
+ - A pointer to a struct :c:type:`v4l2_ctrl_h264_pred_weights`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_H264_PRED_WEIGHTS``.
+ * - struct :c:type:`v4l2_ctrl_h264_slice_params` *
+ - ``p_h264_slice_params``
+ - A pointer to a struct :c:type:`v4l2_ctrl_h264_slice_params`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_H264_SLICE_PARAMS``.
+ * - struct :c:type:`v4l2_ctrl_h264_decode_params` *
+ - ``p_h264_decode_params``
+ - A pointer to a struct :c:type:`v4l2_ctrl_h264_decode_params`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_H264_DECODE_PARAMS``.
+ * - struct :c:type:`v4l2_ctrl_fwht_params` *
+ - ``p_fwht_params``
+ - A pointer to a struct :c:type:`v4l2_ctrl_fwht_params`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_FWHT_PARAMS``.
+ * - struct :c:type:`v4l2_ctrl_vp8_frame` *
+ - ``p_vp8_frame``
+ - A pointer to a struct :c:type:`v4l2_ctrl_vp8_frame`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_VP8_FRAME``.
+ * - struct :c:type:`v4l2_ctrl_mpeg2_sequence` *
+ - ``p_mpeg2_sequence``
+ - A pointer to a struct :c:type:`v4l2_ctrl_mpeg2_sequence`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_MPEG2_SEQUENCE``.
+ * - struct :c:type:`v4l2_ctrl_mpeg2_picture` *
+ - ``p_mpeg2_picture``
+ - A pointer to a struct :c:type:`v4l2_ctrl_mpeg2_picture`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_MPEG2_PICTURE``.
+ * - struct :c:type:`v4l2_ctrl_mpeg2_quantisation` *
+ - ``p_mpeg2_quantisation``
+ - A pointer to a struct :c:type:`v4l2_ctrl_mpeg2_quantisation`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_MPEG2_QUANTISATION``.
+ * - struct :c:type:`v4l2_ctrl_vp9_compressed_hdr` *
+ - ``p_vp9_compressed_hdr_probs``
+ - A pointer to a struct :c:type:`v4l2_ctrl_vp9_compressed_hdr`. Valid if this
+ control is of type ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR``.
+ * - struct :c:type:`v4l2_ctrl_vp9_frame` *
+ - ``p_vp9_frame``
+ - A pointer to a struct :c:type:`v4l2_ctrl_vp9_frame`. Valid if this
+ control is of type ``V4L2_CTRL_TYPE_VP9_FRAME``.
+ * - struct :c:type:`v4l2_ctrl_hdr10_cll_info` *
+ - ``p_hdr10_cll``
+ - A pointer to a struct :c:type:`v4l2_ctrl_hdr10_cll_info`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_HDR10_CLL_INFO``.
+ * - struct :c:type:`v4l2_ctrl_hdr10_mastering_display` *
+ - ``p_hdr10_mastering``
+ - A pointer to a struct :c:type:`v4l2_ctrl_hdr10_mastering_display`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY``.
+ * - struct :c:type:`v4l2_ctrl_hevc_sps` *
+ - ``p_hevc_sps``
+ - A pointer to a struct :c:type:`v4l2_ctrl_hevc_sps`. Valid if this
+ control is of type ``V4L2_CTRL_TYPE_HEVC_SPS``.
+ * - struct :c:type:`v4l2_ctrl_hevc_pps` *
+ - ``p_hevc_pps``
+ - A pointer to a struct :c:type:`v4l2_ctrl_hevc_pps`. Valid if this
+ control is of type ``V4L2_CTRL_TYPE_HEVC_PPS``.
+ * - struct :c:type:`v4l2_ctrl_hevc_slice_params` *
+ - ``p_hevc_slice_params``
+ - A pointer to a struct :c:type:`v4l2_ctrl_hevc_slice_params`. Valid if this
+ control is of type ``V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS``.
+ * - struct :c:type:`v4l2_ctrl_hevc_scaling_matrix` *
+ - ``p_hevc_scaling_matrix``
+ - A pointer to a struct :c:type:`v4l2_ctrl_hevc_scaling_matrix`. Valid if this
+ control is of type ``V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX``.
+ * - struct :c:type:`v4l2_ctrl_hevc_decode_params` *
+ - ``p_hevc_decode_params``
+ - A pointer to a struct :c:type:`v4l2_ctrl_hevc_decode_params`. Valid if this
+ control is of type ``V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS``.
+ * - struct :c:type:`v4l2_ctrl_av1_sequence` *
+ - ``p_av1_sequence``
+ - A pointer to a struct :c:type:`v4l2_ctrl_av1_sequence`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_AV1_SEQUENCE``.
+ * - struct :c:type:`v4l2_ctrl_av1_tile_group_entry` *
+ - ``p_av1_tile_group_entry``
+ - A pointer to a struct :c:type:`v4l2_ctrl_av1_tile_group_entry`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_AV1_TILE_GROUP_ENTRY``.
+ * - struct :c:type:`v4l2_ctrl_av1_frame` *
+ - ``p_av1_frame``
+ - A pointer to a struct :c:type:`v4l2_ctrl_av1_frame`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_AV1_FRAME``.
+ * - struct :c:type:`v4l2_ctrl_av1_film_grain` *
+ - ``p_av1_film_grain``
+ - A pointer to a struct :c:type:`v4l2_ctrl_av1_film_grain`. Valid if this control is
+ of type ``V4L2_CTRL_TYPE_AV1_FILM_GRAIN``.
+ * - void *
+ - ``ptr``
+ - A pointer to a compound type which can be an N-dimensional array
+ and/or a compound type (the control's type is >=
+ ``V4L2_CTRL_COMPOUND_TYPES``). Valid if
+ ``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set for this control.
+ * - }
+ -
+
+.. raw:: latex
+
+ \normalsize
+
+.. tabularcolumns:: |p{4.0cm}|p{2.5cm}|p{10.8cm}|
+
+.. c:type:: v4l2_ext_controls
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ext_controls
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - union {
+ - (anonymous)
+ * - __u32
+ - ``which``
+ - Which value of the control to get/set/try.
+ * - :cspan:`2` ``V4L2_CTRL_WHICH_CUR_VAL`` will return the current value of
+ the control, ``V4L2_CTRL_WHICH_DEF_VAL`` will return the default
+ value of the control and ``V4L2_CTRL_WHICH_REQUEST_VAL`` indicates that
+ these controls have to be retrieved from a request or tried/set for
+ a request. In the latter case the ``request_fd`` field contains the
+ file descriptor of the request that should be used. If the device
+ does not support requests, then ``EACCES`` will be returned.
+
+ When using ``V4L2_CTRL_WHICH_DEF_VAL`` be aware that you can only
+ get the default value of the control, you cannot set or try it.
+
+ For backwards compatibility you can also use a control class here
+ (see :ref:`ctrl-class`). In that case all controls have to
+ belong to that control class. This usage is deprecated, instead
+ just use ``V4L2_CTRL_WHICH_CUR_VAL``. There are some very old
+ drivers that do not yet support ``V4L2_CTRL_WHICH_CUR_VAL`` and
+ that require a control class here. You can test for such drivers
+ by setting ``which`` to ``V4L2_CTRL_WHICH_CUR_VAL`` and calling
+ :ref:`VIDIOC_TRY_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` with a count of 0.
+ If that fails, then the driver does not support ``V4L2_CTRL_WHICH_CUR_VAL``.
+ * - __u32
+ - ``ctrl_class``
+ - Deprecated name kept for backwards compatibility. Use ``which`` instead.
+ * - }
+ -
+ * - __u32
+ - ``count``
+ - The number of controls in the controls array. May also be zero.
+ * - __u32
+ - ``error_idx``
+ - Index of the failing control. Set by the driver in case of an error.
+ * - :cspan:`2` If the error is associated
+ with a particular control, then ``error_idx`` is set to the index
+ of that control. If the error is not related to a specific
+ control, or the validation step failed (see below), then
+ ``error_idx`` is set to ``count``. The value is undefined if the
+ ioctl returned 0 (success).
+
+ Before controls are read from/written to hardware a validation
+ step takes place: this checks if all controls in the list are
+ valid controls, if no attempt is made to write to a read-only
+ control or read from a write-only control, and any other up-front
+ checks that can be done without accessing the hardware. The exact
+ validations done during this step are driver dependent since some
+ checks might require hardware access for some devices, thus making
+ it impossible to do those checks up-front. However, drivers should
+ make a best-effort to do as many up-front checks as possible.
+
+ This check is done to avoid leaving the hardware in an
+ inconsistent state due to easy-to-avoid problems. But it leads to
+ another problem: the application needs to know whether an error
+ came from the validation step (meaning that the hardware was not
+ touched) or from an error during the actual reading from/writing
+ to hardware.
+
+ The, in hindsight quite poor, solution for that is to set
+ ``error_idx`` to ``count`` if the validation failed. This has the
+ unfortunate side-effect that it is not possible to see which
+ control failed the validation. If the validation was successful
+ and the error happened while accessing the hardware, then
+ ``error_idx`` is less than ``count`` and only the controls up to
+ ``error_idx-1`` were read or written correctly, and the state of
+ the remaining controls is undefined.
+
+ Since :ref:`VIDIOC_TRY_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` does not access hardware there is
+ also no need to handle the validation step in this special way, so
+ ``error_idx`` will just be set to the control that failed the
+ validation step instead of to ``count``. This means that if
+ :ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` fails with ``error_idx`` set to ``count``,
+ then you can call :ref:`VIDIOC_TRY_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` to try to discover the
+ actual control that failed the validation step. Unfortunately,
+ there is no ``TRY`` equivalent for :ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>`.
+ * - __s32
+ - ``request_fd``
+ - File descriptor of the request to be used by this operation. Only
+ valid if ``which`` is set to ``V4L2_CTRL_WHICH_REQUEST_VAL``.
+ If the device does not support requests, then ``EACCES`` will be returned.
+ If requests are supported but an invalid request file descriptor is
+ given, then ``EINVAL`` will be returned.
+ * - __u32
+ - ``reserved``\ [1]
+ - Reserved for future extensions.
+
+ Drivers and applications must set the array to zero.
+ * - struct :c:type:`v4l2_ext_control` *
+ - ``controls``
+ - Pointer to an array of ``count`` v4l2_ext_control structures.
+
+ Ignored if ``count`` equals zero.
+
+.. tabularcolumns:: |p{7.3cm}|p{2.0cm}|p{8.0cm}|
+
+.. cssclass:: longtable
+
+.. _ctrl-class:
+
+.. flat-table:: Control classes
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 3 1 4
+
+ * - ``V4L2_CTRL_CLASS_USER``
+ - 0x980000
+ - The class containing user controls. These controls are described
+ in :ref:`control`. All controls that can be set using the
+ :ref:`VIDIOC_S_CTRL <VIDIOC_G_CTRL>` and
+ :ref:`VIDIOC_G_CTRL <VIDIOC_G_CTRL>` ioctl belong to this
+ class.
+ * - ``V4L2_CTRL_CLASS_CODEC``
+ - 0x990000
+ - The class containing stateful codec controls. These controls are
+ described in :ref:`codec-controls`.
+ * - ``V4L2_CTRL_CLASS_CAMERA``
+ - 0x9a0000
+ - The class containing camera controls. These controls are described
+ in :ref:`camera-controls`.
+ * - ``V4L2_CTRL_CLASS_FM_TX``
+ - 0x9b0000
+ - The class containing FM Transmitter (FM TX) controls. These
+ controls are described in :ref:`fm-tx-controls`.
+ * - ``V4L2_CTRL_CLASS_FLASH``
+ - 0x9c0000
+ - The class containing flash device controls. These controls are
+ described in :ref:`flash-controls`.
+ * - ``V4L2_CTRL_CLASS_JPEG``
+ - 0x9d0000
+ - The class containing JPEG compression controls. These controls are
+ described in :ref:`jpeg-controls`.
+ * - ``V4L2_CTRL_CLASS_IMAGE_SOURCE``
+ - 0x9e0000
+ - The class containing image source controls. These controls are
+ described in :ref:`image-source-controls`.
+ * - ``V4L2_CTRL_CLASS_IMAGE_PROC``
+ - 0x9f0000
+ - The class containing image processing controls. These controls are
+ described in :ref:`image-process-controls`.
+ * - ``V4L2_CTRL_CLASS_FM_RX``
+ - 0xa10000
+ - The class containing FM Receiver (FM RX) controls. These controls
+ are described in :ref:`fm-rx-controls`.
+ * - ``V4L2_CTRL_CLASS_RF_TUNER``
+ - 0xa20000
+ - The class containing RF tuner controls. These controls are
+ described in :ref:`rf-tuner-controls`.
+ * - ``V4L2_CTRL_CLASS_DETECT``
+ - 0xa30000
+ - The class containing motion or object detection controls. These controls
+ are described in :ref:`detect-controls`.
+ * - ``V4L2_CTRL_CLASS_CODEC_STATELESS``
+ - 0xa40000
+ - The class containing stateless codec controls. These controls are
+ described in :ref:`codec-stateless-controls`.
+ * - ``V4L2_CTRL_CLASS_COLORIMETRY``
+ - 0xa50000
+ - The class containing colorimetry controls. These controls are
+ described in :ref:`colorimetry-controls`.
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.
+
+EINVAL
+ The struct :c:type:`v4l2_ext_control` ``id`` is
+ invalid, or the struct :c:type:`v4l2_ext_controls`
+ ``which`` is invalid, or the struct
+ :c:type:`v4l2_ext_control` ``value`` was
+ inappropriate (e.g. the given menu index is not supported by the
+ driver), or the ``which`` field was set to ``V4L2_CTRL_WHICH_REQUEST_VAL``
+ but the given ``request_fd`` was invalid or ``V4L2_CTRL_WHICH_REQUEST_VAL``
+ is not supported by the kernel.
+ This error code is also returned by the
+ :ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` and :ref:`VIDIOC_TRY_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctls if two or
+ more control values are in conflict.
+
+ERANGE
+ The struct :c:type:`v4l2_ext_control` ``value``
+ is out of bounds.
+
+EBUSY
+ The control is temporarily not changeable, possibly because another
+ applications took over control of the device function this control
+ belongs to, or (if the ``which`` field was set to
+ ``V4L2_CTRL_WHICH_REQUEST_VAL``) the request was queued but not yet
+ completed.
+
+ENOSPC
+ The space reserved for the control's payload is insufficient. The
+ field ``size`` is set to a value that is enough to store the payload
+ and this error code is returned.
+
+EACCES
+ Attempt to try or set a read-only control, or to get a write-only
+ control, or to get a control from a request that has not yet been
+ completed.
+
+ Or the ``which`` field was set to ``V4L2_CTRL_WHICH_REQUEST_VAL`` but the
+ device does not support requests.
+
+ Or if there is an attempt to set an inactive control and the driver is
+ not capable of caching the new value until the control is active again.