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-rw-r--r--kernel/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml14
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml b/kernel/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
index 7068b599a..96e17b344 100644
--- a/kernel/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
+++ b/kernel/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
@@ -78,6 +78,12 @@ different audio modulation if the request cannot be satisfied. However
this is a write-only ioctl, it does not return the actual audio
modulation selected.</para>
+ <para><link linkend="sdr">SDR</link> specific modulator types are
+<constant>V4L2_TUNER_SDR</constant> and <constant>V4L2_TUNER_RF</constant>.
+For SDR devices <structfield>txsubchans</structfield> field must be
+initialized to zero.
+The term 'modulator' means SDR transmitter in this context.</para>
+
<para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl
is available.</para>
@@ -140,7 +146,13 @@ indicator, for example a stereo pilot tone.</entry>
</row>
<row>
<entry>__u32</entry>
- <entry><structfield>reserved</structfield>[4]</entry>
+ <entry><structfield>type</structfield></entry>
+ <entry spanname="hspan">Type of the modulator, see <xref
+ linkend="v4l2-tuner-type" />.</entry>
+ </row>
+ <row>
+ <entry>__u32</entry>
+ <entry><structfield>reserved</structfield>[3]</entry>
<entry>Reserved for future extensions. Drivers and
applications must set the array to zero.</entry>
</row>