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authorAntti Palosaari <crope@iki.fi>2015-10-10 13:51:09 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-10-20 15:56:29 -0200
commitc7c1d5a5dea80d908fa9a7945424d872b3588757 (patch)
tree37aa1788875335f625ecf6dd817704fbaab25b80 /Documentation/DocBook/media/v4l
parentf9b4376c82a81943fc196709315dfe554774286a (diff)
[media] DocBook: add SDR specific info to G_MODULATOR / S_MODULATOR
Add SDR specific notes to G_MODULATOR / S_MODULATOR documentation. Signed-off-by: Antti Palosaari <crope@iki.fi> [hans.verkuil@cisco.com: add quotes in "The term 'modulator'"] Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'Documentation/DocBook/media/v4l')
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-g-modulator.xml6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
index 80167fc4483d..96e17b344c5d 100644
--- a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
+++ b/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>