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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-21 09:03:10 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-21 09:03:10 -0700 |
commit | c720f5655df159a630fa0290a0bd67c93e92b0bf (patch) | |
tree | 940d139d0ec1ff5201efddef6cc663166a8a2df3 /Documentation/DocBook/v4l/vidioc-g-ctrl.xml | |
parent | 33e6c1a0de818d3698cdab27c42915661011319d (diff) | |
parent | 84d6ae431f315e8973aac3c3fe1d550fc9240ef3 (diff) | |
download | linux-3.10-c720f5655df159a630fa0290a0bd67c93e92b0bf.tar.gz linux-3.10-c720f5655df159a630fa0290a0bd67c93e92b0bf.tar.bz2 linux-3.10-c720f5655df159a630fa0290a0bd67c93e92b0bf.zip |
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (222 commits)
V4L/DVB (13033): pt1: Don't use a deprecated DMA_BIT_MASK macro
V4L/DVB (13029): radio-si4713: remove #include <linux/version.h>
V4L/DVB (13027): go7007: convert printks to v4l2_info
V4L/DVB (13026): s2250-board: Implement brightness and contrast controls
V4L/DVB (13025): s2250-board: Fix memory leaks
V4L/DVB (13024): go7007: Implement vidioc_g_std and vidioc_querystd
V4L/DVB (13023): go7007: Merge struct gofh and go declarations
V4L/DVB (13022): go7007: Fix mpeg controls
V4L/DVB (13021): go7007: Fix whitespace and line lengths
V4L/DVB (13020): go7007: Updates to Kconfig and Makefile
V4L/DVB (13019): video: initial support for ADV7180
V4L/DVB (13018): kzalloc failure ignored in au8522_probe()
V4L/DVB (13017): gspca: kmalloc failure ignored in sd_start()
V4L/DVB (13016): kmalloc failure ignored in lgdt3304_attach() and s921_attach()
V4L/DVB (13015): kmalloc failure ignored in m920x_firmware_download()
V4L/DVB (13014): Add support for Compro VideoMate E800 (DVB-T part only)
V4L/DVB (13013): FM TX: si4713: Kconfig: Fixed two typos.
V4L/DVB (13012): uvc: introduce missing kfree
V4L/DVB (13011): Change tuner type of BeholdTV cards
V4L/DVB (13009): gspca - stv06xx-hdcs: Reduce exposure range
...
Diffstat (limited to 'Documentation/DocBook/v4l/vidioc-g-ctrl.xml')
-rw-r--r-- | Documentation/DocBook/v4l/vidioc-g-ctrl.xml | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/Documentation/DocBook/v4l/vidioc-g-ctrl.xml b/Documentation/DocBook/v4l/vidioc-g-ctrl.xml new file mode 100644 index 00000000000..8b5e6ff7f3d --- /dev/null +++ b/Documentation/DocBook/v4l/vidioc-g-ctrl.xml @@ -0,0 +1,130 @@ +<refentry id="vidioc-g-ctrl"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_CTRL</refname> + <refname>VIDIOC_S_CTRL</refname> + <refpurpose>Get or set the value of a control</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 v4l2_control +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_CTRL, VIDIOC_S_CTRL</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To get the current value of a control applications +initialize the <structfield>id</structfield> field of a struct +<structname>v4l2_control</structname> and call the +<constant>VIDIOC_G_CTRL</constant> ioctl with a pointer to this +structure. To change the value of a control applications initialize +the <structfield>id</structfield> and <structfield>value</structfield> +fields of a struct <structname>v4l2_control</structname> and call the +<constant>VIDIOC_S_CTRL</constant> ioctl.</para> + + <para>When the <structfield>id</structfield> is invalid drivers +return an &EINVAL;. When the <structfield>value</structfield> is out +of bounds drivers can choose to take the closest valid value or return +an &ERANGE;, whatever seems more appropriate. However, +<constant>VIDIOC_S_CTRL</constant> is a write-only ioctl, it does not +return the actual new value.</para> + + <para>These ioctls work only with user controls. For other +control classes the &VIDIOC-G-EXT-CTRLS;, &VIDIOC-S-EXT-CTRLS; or +&VIDIOC-TRY-EXT-CTRLS; must be used.</para> + + <table pgwide="1" frame="none" id="v4l2-control"> + <title>struct <structname>v4l2_control</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>id</structfield></entry> + <entry>Identifies the control, set by the +application.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>value</structfield></entry> + <entry>New value or current value.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-control; <structfield>id</structfield> is +invalid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ERANGE</errorcode></term> + <listitem> + <para>The &v4l2-control; <structfield>value</structfield> +is out of bounds.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The control is temporarily not changeable, possibly +because another applications took over control of the device function +this control belongs to.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> + +<!-- +Local Variables: +mode: sgml +sgml-parent-document: "v4l2.sgml" +indent-tabs-mode: nil +End: +--> |