summaryrefslogtreecommitdiffstats
path: root/Documentation/media/uapi/cec/cec-ioc-adap-g-caps.rst
blob: a35dca28117893331bcbf51d3fd0aa7245966a70 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
.. -*- coding: utf-8; mode: rst -*-

.. _CEC_ADAP_G_CAPS:

*********************
ioctl CEC_ADAP_G_CAPS
*********************

Name
====

CEC_ADAP_G_CAPS - Query device capabilities

Synopsis
========

.. c:function:: int ioctl( int fd, CEC_ADAP_G_CAPS, struct cec_caps *argp )
    :name: CEC_ADAP_G_CAPS

Arguments
=========

``fd``
    File descriptor returned by :ref:`open() <cec-func-open>`.

``argp``


Description
===========

.. note::

   This documents the proposed CEC API. This API is not yet finalized
   and is currently only available as a staging kernel module.

All cec devices must support :ref:`ioctl CEC_ADAP_G_CAPS <CEC_ADAP_G_CAPS>`. To query
device information, applications call the ioctl with a pointer to a
struct :c:type:`cec_caps`. The driver fills the structure and
returns the information to the application. The ioctl never fails.

.. tabularcolumns:: |p{1.2cm}|p{2.5cm}|p{13.8cm}|

.. c:type:: cec_caps

.. flat-table:: struct cec_caps
    :header-rows:  0
    :stub-columns: 0
    :widths:       1 1 16


    -  .. row 1

       -  char

       -  ``driver[32]``

       -  The name of the cec adapter driver.

    -  .. row 2

       -  char

       -  ``name[32]``

       -  The name of this CEC adapter. The combination ``driver`` and
	  ``name`` must be unique.

    -  .. row 3

       -  __u32

       -  ``capabilities``

       -  The capabilities of the CEC adapter, see
	  :ref:`cec-capabilities`.

    -  .. row 4

       -  __u32

       -  ``version``

       -  CEC Framework API version, formatted with the ``KERNEL_VERSION()``
	  macro.


.. tabularcolumns:: |p{4.4cm}|p{2.5cm}|p{10.6cm}|

.. _cec-capabilities:

.. flat-table:: CEC Capabilities Flags
    :header-rows:  0
    :stub-columns: 0
    :widths:       3 1 8


    -  .. _`CEC-CAP-PHYS-ADDR`:

       -  ``CEC_CAP_PHYS_ADDR``

       -  0x00000001

       -  Userspace has to configure the physical address by calling
	  :ref:`ioctl CEC_ADAP_S_PHYS_ADDR <CEC_ADAP_S_PHYS_ADDR>`. If
	  this capability isn't set, then setting the physical address is
	  handled by the kernel whenever the EDID is set (for an HDMI
	  receiver) or read (for an HDMI transmitter).

    -  .. _`CEC-CAP-LOG-ADDRS`:

       -  ``CEC_CAP_LOG_ADDRS``

       -  0x00000002

       -  Userspace has to configure the logical addresses by calling
	  :ref:`ioctl CEC_ADAP_S_LOG_ADDRS <CEC_ADAP_S_LOG_ADDRS>`. If
	  this capability isn't set, then the kernel will have configured
	  this.

    -  .. _`CEC-CAP-TRANSMIT`:

       -  ``CEC_CAP_TRANSMIT``

       -  0x00000004

       -  Userspace can transmit CEC messages by calling
	  :ref:`ioctl CEC_TRANSMIT <CEC_TRANSMIT>`. This implies that
	  userspace can be a follower as well, since being able to transmit
	  messages is a prerequisite of becoming a follower. If this
	  capability isn't set, then the kernel will handle all CEC
	  transmits and process all CEC messages it receives.

    -  .. _`CEC-CAP-PASSTHROUGH`:

       -  ``CEC_CAP_PASSTHROUGH``

       -  0x00000008

       -  Userspace can use the passthrough mode by calling
	  :ref:`ioctl CEC_S_MODE <CEC_S_MODE>`.

    -  .. _`CEC-CAP-RC`:

       -  ``CEC_CAP_RC``

       -  0x00000010

       -  This adapter supports the remote control protocol.

    -  .. _`CEC-CAP-MONITOR-ALL`:

       -  ``CEC_CAP_MONITOR_ALL``

       -  0x00000020

       -  The CEC hardware can monitor all messages, not just directed and
	  broadcast messages.



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.