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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/Documentation/DocBook/media/v4l/dev-sdr.xml
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/Documentation/DocBook/media/v4l/dev-sdr.xml')
-rw-r--r--kernel/Documentation/DocBook/media/v4l/dev-sdr.xml32
1 files changed, 22 insertions, 10 deletions
diff --git a/kernel/Documentation/DocBook/media/v4l/dev-sdr.xml b/kernel/Documentation/DocBook/media/v4l/dev-sdr.xml
index f8903568a..a659771f7 100644
--- a/kernel/Documentation/DocBook/media/v4l/dev-sdr.xml
+++ b/kernel/Documentation/DocBook/media/v4l/dev-sdr.xml
@@ -28,6 +28,16 @@ Devices supporting the SDR receiver interface set the
<structfield>capabilities</structfield> field of &v4l2-capability;
returned by the &VIDIOC-QUERYCAP; ioctl. That flag means the device has an
Analog to Digital Converter (ADC), which is a mandatory element for the SDR receiver.
+ </para>
+ <para>
+Devices supporting the SDR transmitter interface set the
+<constant>V4L2_CAP_SDR_OUTPUT</constant> and
+<constant>V4L2_CAP_MODULATOR</constant> flag in the
+<structfield>capabilities</structfield> field of &v4l2-capability;
+returned by the &VIDIOC-QUERYCAP; ioctl. That flag means the device has an
+Digital to Analog Converter (DAC), which is a mandatory element for the SDR transmitter.
+ </para>
+ <para>
At least one of the read/write, streaming or asynchronous I/O methods must
be supported.
</para>
@@ -39,15 +49,16 @@ be supported.
<para>
SDR devices can support <link linkend="control">controls</link>, and must
support the <link linkend="tuner">tuner</link> ioctls. Tuner ioctls are used
-for setting the ADC sampling rate (sampling frequency) and the possible RF tuner
-frequency.
+for setting the ADC/DAC sampling rate (sampling frequency) and the possible
+radio frequency (RF).
</para>
<para>
-The <constant>V4L2_TUNER_ADC</constant> tuner type is used for ADC tuners, and
-the <constant>V4L2_TUNER_RF</constant> tuner type is used for RF tuners. The
-tuner index of the RF tuner (if any) must always follow the ADC tuner index.
-Normally the ADC tuner is #0 and the RF tuner is #1.
+The <constant>V4L2_TUNER_SDR</constant> tuner type is used for setting SDR
+device ADC/DAC frequency, and the <constant>V4L2_TUNER_RF</constant>
+tuner type is used for setting radio frequency.
+The tuner index of the RF tuner (if any) must always follow the SDR tuner index.
+Normally the SDR tuner is #0 and the RF tuner is #1.
</para>
<para>
@@ -59,9 +70,9 @@ The &VIDIOC-S-HW-FREQ-SEEK; ioctl is not supported.
<title>Data Format Negotiation</title>
<para>
-The SDR capture device uses the <link linkend="format">format</link> ioctls to
-select the capture format. Both the sampling resolution and the data streaming
-format are bound to that selectable format. In addition to the basic
+The SDR device uses the <link linkend="format">format</link> ioctls to
+select the capture and output format. Both the sampling resolution and the data
+streaming format are bound to that selectable format. In addition to the basic
<link linkend="format">format</link> ioctls, the &VIDIOC-ENUM-FMT; ioctl
must be supported as well.
</para>
@@ -69,7 +80,8 @@ must be supported as well.
<para>
To use the <link linkend="format">format</link> ioctls applications set the
<structfield>type</structfield> field of a &v4l2-format; to
-<constant>V4L2_BUF_TYPE_SDR_CAPTURE</constant> and use the &v4l2-sdr-format;
+<constant>V4L2_BUF_TYPE_SDR_CAPTURE</constant> or
+<constant>V4L2_BUF_TYPE_SDR_OUTPUT</constant> and use the &v4l2-sdr-format;
<structfield>sdr</structfield> member of the <structfield>fmt</structfield>
union as needed per the desired operation.
Currently there is two fields, <structfield>pixelformat</structfield> and