1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2 .. c:namespace:: V4L
3
4 .. _VIDIOC_SUBDEV_G_CLIENT_CAP:
5
6 **********************************************
7 ioctl VIDIOC_SUBDEV_G_CLIENT_CAP, VIDIOC_SUBDE
8 **********************************************
9
10 Name
11 ====
12
13 VIDIOC_SUBDEV_G_CLIENT_CAP - VIDIOC_SUBDEV_S_C
14 capabilities.
15
16 Synopsis
17 ========
18
19 .. c:macro:: VIDIOC_SUBDEV_G_CLIENT_CAP
20
21 ``int ioctl(int fd, VIDIOC_SUBDEV_G_CLIENT_CAP
22
23 .. c:macro:: VIDIOC_SUBDEV_S_CLIENT_CAP
24
25 ``int ioctl(int fd, VIDIOC_SUBDEV_S_CLIENT_CAP
26
27 Arguments
28 =========
29
30 ``fd``
31 File descriptor returned by :ref:`open() <
32
33 ``argp``
34 Pointer to struct :c:type:`v4l2_subdev_cli
35
36 Description
37 ===========
38
39 These ioctls are used to get and set the clien
40 subdevice ioctls) capabilities. The client cap
41 handle of the opened subdev device node, and t
42 capabilities for each opened subdev separately
43
44 By default no client capabilities are set when
45
46 The purpose of the client capabilities are to
47 of the client, mainly related to maintaining c
48 kernel and userspace versions.
49
50 The ``VIDIOC_SUBDEV_G_CLIENT_CAP`` ioctl retur
51 associated with the file handle ``fd``.
52
53 The ``VIDIOC_SUBDEV_S_CLIENT_CAP`` ioctl sets
54 handle ``fd``. The new capabilities fully repl
55 ioctl can therefore also be used to remove cap
56 been set.
57
58 ``VIDIOC_SUBDEV_S_CLIENT_CAP`` modifies the st
59 :c:type:`v4l2_subdev_client_capability` to ref
60 been accepted. A common case for the kernel no
61 the kernel is older than the headers the users
62 is unknown to the kernel.
63
64 .. tabularcolumns:: |p{1.5cm}|p{2.9cm}|p{12.9c
65
66 .. c:type:: v4l2_subdev_client_capability
67
68 .. flat-table:: struct v4l2_subdev_client_capa
69 :header-rows: 0
70 :stub-columns: 0
71 :widths: 3 4 20
72
73 * - __u64
74 - ``capabilities``
75 - Sub-device client capabilities of the
76
77 .. tabularcolumns:: |p{6.8cm}|p{2.4cm}|p{8.1cm
78
79 .. flat-table:: Client Capabilities
80 :header-rows: 1
81
82 * - Capability
83 - Description
84 * - ``V4L2_SUBDEV_CLIENT_CAP_STREAMS``
85 - The client is aware of streams. Settin
86 of 'stream' fields (referring to the s
87 ioctls. If this is not set (which is t
88 will be forced to 0 by the kernel.
89 * - ``V4L2_SUBDEV_CLIENT_CAP_INTERVAL_USES
90 - The client is aware of the :c:type:`v4
91 ``which`` field. If this is not set (w
92 ``which`` field is forced to ``V4L2_SU
93 kernel.
94
95 Return Value
96 ============
97
98 On success 0 is returned, on error -1 and the
99 appropriately. The generic error codes are des
100 :ref:`Generic Error Codes <gen-errors>` chapte
101
102 ENOIOCTLCMD
103 The kernel does not support this ioctl.
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