Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 274 insertions, 0 deletions

diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst b/Documentation/media/uapi/v4l/vidioc-querycap.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _VIDIOC_QUERYCAP:
+
+*********************
+ioctl VIDIOC_QUERYCAP
+*********************
+
+Name
+====
+
+VIDIOC_QUERYCAP - Query device capabilities
+
+
+Synopsis
+========
+
+.. c:function:: int ioctl( int fd, VIDIOC_QUERYCAP, struct v4l2_capability *argp )
+    :name: VIDIOC_QUERYCAP
+
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :ref:`open() <func-open>`.
+
+``argp``
+    Pointer to struct :c:type:`v4l2_capability`.
+
+
+Description
+===========
+
+All V4L2 devices support the ``VIDIOC_QUERYCAP`` ioctl. It is used to
+identify kernel devices compatible with this specification and to obtain
+information about driver and hardware capabilities. The ioctl takes a
+pointer to a struct :c:type:`v4l2_capability` which is
+filled by the driver. When the driver is not compatible with this
+specification the ioctl returns an ``EINVAL`` error code.
+
+
+.. tabularcolumns:: |p{1.5cm}|p{2.5cm}|p{13cm}|
+
+.. c:type:: v4l2_capability
+
+.. flat-table:: struct v4l2_capability
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       3 4 20
+
+    * - __u8
+      - ``driver``\ [16]
+      - Name of the driver, a unique NUL-terminated ASCII string. For
+	example: "bttv". Driver specific applications can use this
+	information to verify the driver identity. It is also useful to
+	work around known bugs, or to identify drivers in error reports.
+
+	Storing strings in fixed sized arrays is bad practice but
+	unavoidable here. Drivers and applications should take precautions
+	to never read or write beyond the end of the array and to make
+	sure the strings are properly NUL-terminated.
+    * - __u8
+      - ``card``\ [32]
+      - Name of the device, a NUL-terminated UTF-8 string. For example:
+	"Yoyodyne TV/FM". One driver may support different brands or
+	models of video hardware. This information is intended for users,
+	for example in a menu of available devices. Since multiple TV
+	cards of the same brand may be installed which are supported by
+	the same driver, this name should be combined with the character
+	device file name (e. g. ``/dev/video2``) or the ``bus_info``
+	string to avoid ambiguities.
+    * - __u8
+      - ``bus_info``\ [32]
+      - Location of the device in the system, a NUL-terminated ASCII
+	string. For example: "PCI:0000:05:06.0". This information is
+	intended for users, to distinguish multiple identical devices. If
+	no such information is available the field must simply count the
+	devices controlled by the driver ("platform:vivi-000"). The
+	bus_info must start with "PCI:" for PCI boards, "PCIe:" for PCI
+	Express boards, "usb-" for USB devices, "I2C:" for i2c devices,
+	"ISA:" for ISA devices, "parport" for parallel port devices and
+	"platform:" for platform devices.
+    * - __u32
+      - ``version``
+      - Version number of the driver.
+
+	Starting with kernel 3.1, the version reported is provided by the
+	V4L2 subsystem following the kernel numbering scheme. However, it
+	may not always return the same version as the kernel if, for
+	example, a stable or distribution-modified kernel uses the V4L2
+	stack from a newer kernel.
+
+	The version number is formatted using the ``KERNEL_VERSION()``
+	macro. For example if the media stack corresponds to the V4L2
+	version shipped with Kernel 4.14, it would be equivalent to:
+    * - :cspan:`2`
+
+	``#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))``
+
+	``__u32 version = KERNEL_VERSION(4, 14, 0);``
+
+	``printf ("Version: %u.%u.%u\\n",``
+
+	``(version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);``
+    * - __u32
+      - ``capabilities``
+      - Available capabilities of the physical device as a whole, see
+	:ref:`device-capabilities`. The same physical device can export
+	multiple devices in /dev (e.g. /dev/videoX, /dev/vbiY and
+	/dev/radioZ). The ``capabilities`` field should contain a union of
+	all capabilities available around the several V4L2 devices
+	exported to userspace. For all those devices the ``capabilities``
+	field returns the same set of capabilities. This allows
+	applications to open just one of the devices (typically the video
+	device) and discover whether video, vbi and/or radio are also
+	supported.
+    * - __u32
+      - ``device_caps``
+      - Device capabilities of the opened device, see
+	:ref:`device-capabilities`. Should contain the available
+	capabilities of that specific device node. So, for example,
+	``device_caps`` of a radio device will only contain radio related
+	capabilities and no video or vbi capabilities. This field is only
+	set if the ``capabilities`` field contains the
+	``V4L2_CAP_DEVICE_CAPS`` capability. Only the ``capabilities``
+	field can have the ``V4L2_CAP_DEVICE_CAPS`` capability,
+	``device_caps`` will never set ``V4L2_CAP_DEVICE_CAPS``.
+    * - __u32
+      - ``reserved``\ [3]
+      - Reserved for future extensions. Drivers must set this array to
+	zero.
+
+
+
+.. tabularcolumns:: |p{6.1cm}|p{2.2cm}|p{8.7cm}|
+
+.. _device-capabilities:
+
+.. cssclass:: longtable
+
+.. flat-table:: Device Capabilities Flags
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       3 1 4
+
+    * - ``V4L2_CAP_VIDEO_CAPTURE``
+      - 0x00000001
+      - The device supports the single-planar API through the
+	:ref:`Video Capture <capture>` interface.
+    * - ``V4L2_CAP_VIDEO_CAPTURE_MPLANE``
+      - 0x00001000
+      - The device supports the :ref:`multi-planar API <planar-apis>`
+	through the :ref:`Video Capture <capture>` interface.
+    * - ``V4L2_CAP_VIDEO_OUTPUT``
+      - 0x00000002
+      - The device supports the single-planar API through the
+	:ref:`Video Output <output>` interface.
+    * - ``V4L2_CAP_VIDEO_OUTPUT_MPLANE``
+      - 0x00002000
+      - The device supports the :ref:`multi-planar API <planar-apis>`
+	through the :ref:`Video Output <output>` interface.
+    * - ``V4L2_CAP_VIDEO_M2M``
+      - 0x00004000
+      - The device supports the single-planar API through the Video
+	Memory-To-Memory interface.
+    * - ``V4L2_CAP_VIDEO_M2M_MPLANE``
+      - 0x00008000
+      - The device supports the :ref:`multi-planar API <planar-apis>`
+	through the Video Memory-To-Memory interface.
+    * - ``V4L2_CAP_VIDEO_OVERLAY``
+      - 0x00000004
+      - The device supports the :ref:`Video Overlay <overlay>`
+	interface. A video overlay device typically stores captured images
+	directly in the video memory of a graphics card, with hardware
+	clipping and scaling.
+    * - ``V4L2_CAP_VBI_CAPTURE``
+      - 0x00000010
+      - The device supports the :ref:`Raw VBI Capture <raw-vbi>`
+	interface, providing Teletext and Closed Caption data.
+    * - ``V4L2_CAP_VBI_OUTPUT``
+      - 0x00000020
+      - The device supports the :ref:`Raw VBI Output <raw-vbi>`
+	interface.
+    * - ``V4L2_CAP_SLICED_VBI_CAPTURE``
+      - 0x00000040
+      - The device supports the :ref:`Sliced VBI Capture <sliced>`
+	interface.
+    * - ``V4L2_CAP_SLICED_VBI_OUTPUT``
+      - 0x00000080
+      - The device supports the :ref:`Sliced VBI Output <sliced>`
+	interface.
+    * - ``V4L2_CAP_RDS_CAPTURE``
+      - 0x00000100
+      - The device supports the :ref:`RDS <rds>` capture interface.
+    * - ``V4L2_CAP_VIDEO_OUTPUT_OVERLAY``
+      - 0x00000200
+      - The device supports the :ref:`Video Output Overlay <osd>` (OSD)
+	interface. Unlike the *Video Overlay* interface, this is a
+	secondary function of video output devices and overlays an image
+	onto an outgoing video signal. When the driver sets this flag, it
+	must clear the ``V4L2_CAP_VIDEO_OVERLAY`` flag and vice
+	versa. [#f1]_
+    * - ``V4L2_CAP_HW_FREQ_SEEK``
+      - 0x00000400
+      - The device supports the
+	:ref:`VIDIOC_S_HW_FREQ_SEEK` ioctl
+	for hardware frequency seeking.
+    * - ``V4L2_CAP_RDS_OUTPUT``
+      - 0x00000800
+      - The device supports the :ref:`RDS <rds>` output interface.
+    * - ``V4L2_CAP_TUNER``
+      - 0x00010000
+      - The device has some sort of tuner to receive RF-modulated video
+	signals. For more information about tuner programming see
+	:ref:`tuner`.
+    * - ``V4L2_CAP_AUDIO``
+      - 0x00020000
+      - The device has audio inputs or outputs. It may or may not support
+	audio recording or playback, in PCM or compressed formats. PCM
+	audio support must be implemented as ALSA or OSS interface. For
+	more information on audio inputs and outputs see :ref:`audio`.
+    * - ``V4L2_CAP_RADIO``
+      - 0x00040000
+      - This is a radio receiver.
+    * - ``V4L2_CAP_MODULATOR``
+      - 0x00080000
+      - The device has some sort of modulator to emit RF-modulated
+	video/audio signals. For more information about modulator
+	programming see :ref:`tuner`.
+    * - ``V4L2_CAP_SDR_CAPTURE``
+      - 0x00100000
+      - The device supports the :ref:`SDR Capture <sdr>` interface.
+    * - ``V4L2_CAP_EXT_PIX_FORMAT``
+      - 0x00200000
+      - The device supports the struct
+	:c:type:`v4l2_pix_format` extended fields.
+    * - ``V4L2_CAP_SDR_OUTPUT``
+      - 0x00400000
+      - The device supports the :ref:`SDR Output <sdr>` interface.
+    * - ``V4L2_CAP_META_CAPTURE``
+      - 0x00800000
+      - The device supports the :ref:`metadata` capture interface.
+    * - ``V4L2_CAP_READWRITE``
+      - 0x01000000
+      - The device supports the :ref:`read() <rw>` and/or
+	:ref:`write() <rw>` I/O methods.
+    * - ``V4L2_CAP_ASYNCIO``
+      - 0x02000000
+      - The device supports the :ref:`asynchronous <async>` I/O methods.
+    * - ``V4L2_CAP_STREAMING``
+      - 0x04000000
+      - The device supports the :ref:`streaming <mmap>` I/O method.
+    * - ``V4L2_CAP_TOUCH``
+      - 0x10000000
+      - This is a touch device.
+    * - ``V4L2_CAP_DEVICE_CAPS``
+      - 0x80000000
+      - The driver fills the ``device_caps`` field. This capability can
+	only appear in the ``capabilities`` field and never in the
+	``device_caps`` field.
+
+
+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.
+
+.. [#f1]
+   The struct :c:type:`v4l2_framebuffer` lacks an
+   enum :c:type:`v4l2_buf_type` field, therefore the
+   type of overlay is implied by the driver capabilities.