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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-09-22 19:49:27 -0400
committerAnton Vorontsov <avorontsov@ru.mvista.com>2009-09-22 19:49:27 -0400
commitf056878332a91ed984a116bad4e7d49aefff9e6e (patch)
tree572f4757c8e7811d45e0be0c2ae529c78fb63441 /Documentation/DocBook/v4l/vidioc-s-hw-freq-seek.xml
parent3961f7c3cf247eee5df7fabadc7a40f2deeb98f3 (diff)
parent7fa07729e439a6184bd824746d06a49cca553f15 (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts: drivers/power/wm97xx_battery.c
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1<refentry id="vidioc-s-hw-freq-seek">
2 <refmeta>
3 <refentrytitle>ioctl VIDIOC_S_HW_FREQ_SEEK</refentrytitle>
4 &manvol;
5 </refmeta>
6
7 <refnamediv>
8 <refname>VIDIOC_S_HW_FREQ_SEEK</refname>
9 <refpurpose>Perform a hardware frequency seek</refpurpose>
10 </refnamediv>
11
12 <refsynopsisdiv>
13 <funcsynopsis>
14 <funcprototype>
15 <funcdef>int <function>ioctl</function></funcdef>
16 <paramdef>int <parameter>fd</parameter></paramdef>
17 <paramdef>int <parameter>request</parameter></paramdef>
18 <paramdef>struct v4l2_hw_freq_seek
19*<parameter>argp</parameter></paramdef>
20 </funcprototype>
21 </funcsynopsis>
22 </refsynopsisdiv>
23
24 <refsect1>
25 <title>Arguments</title>
26
27 <variablelist>
28 <varlistentry>
29 <term><parameter>fd</parameter></term>
30 <listitem>
31 <para>&fd;</para>
32 </listitem>
33 </varlistentry>
34 <varlistentry>
35 <term><parameter>request</parameter></term>
36 <listitem>
37 <para>VIDIOC_S_HW_FREQ_SEEK</para>
38 </listitem>
39 </varlistentry>
40 <varlistentry>
41 <term><parameter>argp</parameter></term>
42 <listitem>
43 <para></para>
44 </listitem>
45 </varlistentry>
46 </variablelist>
47 </refsect1>
48
49 <refsect1>
50 <title>Description</title>
51
52 <para>Start a hardware frequency seek from the current frequency.
53To do this applications initialize the <structfield>tuner</structfield>,
54<structfield>type</structfield>, <structfield>seek_upward</structfield> and
55<structfield>wrap_around</structfield> fields, and zero out the
56<structfield>reserved</structfield> array of a &v4l2-hw-freq-seek; and
57call the <constant>VIDIOC_S_HW_FREQ_SEEK</constant> ioctl with a pointer
58to this structure.</para>
59
60 <para>This ioctl is supported if the <constant>V4L2_CAP_HW_FREQ_SEEK</constant> capability is set.</para>
61
62 <table pgwide="1" frame="none" id="v4l2-hw-freq-seek">
63 <title>struct <structname>v4l2_hw_freq_seek</structname></title>
64 <tgroup cols="3">
65 &cs-str;
66 <tbody valign="top">
67 <row>
68 <entry>__u32</entry>
69 <entry><structfield>tuner</structfield></entry>
70 <entry>The tuner index number. This is the
71same value as in the &v4l2-input; <structfield>tuner</structfield>
72field and the &v4l2-tuner; <structfield>index</structfield> field.</entry>
73 </row>
74 <row>
75 <entry>&v4l2-tuner-type;</entry>
76 <entry><structfield>type</structfield></entry>
77 <entry>The tuner type. This is the same value as in the
78&v4l2-tuner; <structfield>type</structfield> field.</entry>
79 </row>
80 <row>
81 <entry>__u32</entry>
82 <entry><structfield>seek_upward</structfield></entry>
83 <entry>If non-zero, seek upward from the current frequency, else seek downward.</entry>
84 </row>
85 <row>
86 <entry>__u32</entry>
87 <entry><structfield>wrap_around</structfield></entry>
88 <entry>If non-zero, wrap around when at the end of the frequency range, else stop seeking.</entry>
89 </row>
90 <row>
91 <entry>__u32</entry>
92 <entry><structfield>reserved</structfield>[8]</entry>
93 <entry>Reserved for future extensions. Drivers and
94 applications must set the array to zero.</entry>
95 </row>
96 </tbody>
97 </tgroup>
98 </table>
99 </refsect1>
100
101 <refsect1>
102 &return-value;
103
104 <variablelist>
105 <varlistentry>
106 <term><errorcode>EINVAL</errorcode></term>
107 <listitem>
108 <para>The <structfield>tuner</structfield> index is out of
109bounds or the value in the <structfield>type</structfield> field is
110wrong.</para>
111 </listitem>
112 </varlistentry>
113 <varlistentry>
114 <term><errorcode>EAGAIN</errorcode></term>
115 <listitem>
116 <para>The ioctl timed-out. Try again.</para>
117 </listitem>
118 </varlistentry>
119 </variablelist>
120 </refsect1>
121</refentry>
122
123<!--
124Local Variables:
125mode: sgml
126sgml-parent-document: "v4l2.sgml"
127indent-tabs-mode: nil
128End:
129-->