Add SDR specific notes to G_MODULATOR / S_MODULATOR documentation.
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
Documentation/DocBook/media/v4l/vidioc-g-modulator.xml | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
index 80167fc..affb694 100644
--- a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
@@ -78,6 +78,15 @@ 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>.
+Valid fields for these modulator types are <structfield>index</structfield>,
+<structfield>name</structfield>, <structfield>capability</structfield>,
+<structfield>rangelow</structfield>, <structfield>rangehigh</structfield>
+and <structfield>type</structfield>. All the rest fields must be
+initialized to zero by both application and driver.
+Term modulator means SDR transmitter on this context.</para>
+
<para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl
is available.</para>
--
http://palosaari.fi/
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