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[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>
This commit is contained in:
Antti Palosaari 2015-10-10 13:51:09 -03:00 committed by Mauro Carvalho Chehab
parent f9b4376c82
commit c7c1d5a5de
1 changed files with 6 additions and 0 deletions
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Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
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@ -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>