blob: 2ce521419e67ec5d8b503e6169e9859de6cf7da0 (
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
|
<refentry id="media-ioc-device-info">
<refmeta>
<refentrytitle>ioctl MEDIA_IOC_DEVICE_INFO</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname>MEDIA_IOC_DEVICE_INFO</refname>
<refpurpose>Query device information</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>int <function>ioctl</function></funcdef>
<paramdef>int <parameter>fd</parameter></paramdef>
<paramdef>int <parameter>request</parameter></paramdef>
<paramdef>struct media_device_info *<parameter>argp</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term><parameter>fd</parameter></term>
<listitem>
<para>File descriptor returned by
<link linkend='media-func-open'><function>open()</function></link>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>request</parameter></term>
<listitem>
<para>MEDIA_IOC_DEVICE_INFO</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>argp</parameter></term>
<listitem>
<para></para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Description</title>
<para>All media devices must support the <constant>MEDIA_IOC_DEVICE_INFO</constant>
ioctl. To query device information, applications call the ioctl with a
pointer to a &media-device-info;. The driver fills the structure and returns
the information to the application.
The ioctl never fails.</para>
<table pgwide="1" frame="none" id="media-device-info">
<title>struct <structname>media_device_info</structname></title>
<tgroup cols="3">
&cs-str;
<tbody valign="top">
<row>
<entry>char</entry>
<entry><structfield>driver</structfield>[16]</entry>
<entry><para>Name of the driver implementing the media API as a
NUL-terminated ASCII string. The driver version is stored in the
<structfield>driver_version</structfield> field.</para>
<para>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.</para></entry>
</row>
<row>
<entry>char</entry>
<entry><structfield>model</structfield>[32]</entry>
<entry>Device model name as a NUL-terminated UTF-8 string. The
device version is stored in the <structfield>device_version</structfield>
field and is not be appended to the model name.</entry>
</row>
<row>
<entry>char</entry>
<entry><structfield>serial</structfield>[40]</entry>
<entry>Serial number as a NUL-terminated ASCII string.</entry>
</row>
<row>
<entry>char</entry>
<entry><structfield>bus_info</structfield>[32]</entry>
<entry>Location of the device in the system as a NUL-terminated
ASCII string. This includes the bus type name (PCI, USB, ...) and a
bus-specific identifier.</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>media_version</structfield></entry>
<entry>Media API version, formatted with the
<constant>KERNEL_VERSION()</constant> macro.</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>hw_revision</structfield></entry>
<entry>Hardware device revision in a driver-specific format.</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>media_version</structfield></entry>
<entry>Media device driver version, formatted with the
<constant>KERNEL_VERSION()</constant> macro. Together with the
<structfield>driver</structfield> field this identifies a particular
driver.</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>reserved</structfield>[31]</entry>
<entry>Reserved for future extensions. Drivers and applications must
set this array to zero.</entry>
</row>
</tbody>
</tgroup>
</table>
<para>The <structfield>serial</structfield> and <structfield>bus_info</structfield>
fields can be used to distinguish between multiple instances of otherwise
identical hardware. The serial number takes precedence when provided and can
be assumed to be unique. If the serial number is an empty string, the
<structfield>bus_info</structfield> field can be used instead. The
<structfield>bus_info</structfield> field is guaranteed to be unique, but
can vary across reboots or device unplug/replug.</para>
</refsect1>
<refsect1>
&return-value;
</refsect1>
</refentry>
|
