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authorLinus Torvalds <torvalds@linux-foundation.org>2016-08-04 09:59:37 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-04 09:59:37 -0400
commitc1ece76719205690f4b448460d9b85c130e8021b (patch)
tree01072c593d53ef551788228ea28ce8bc87bc0e45 /Documentation/DocBook/media/v4l/dev-radio.xml
parentfb1b83d3ff78168e10799627f231cf0c05c9d80d (diff)
parent292eaf50c7df4ae2ae8aaa9e1ce3f1240a353ee8 (diff)
Merge tag 'media/v4.8-5' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media DocBook removal and some fixups from Mauro Carvalho Chehab: - removal of the media DocBook (since it's all in Sphinx now) - videobuf2: Fix an allocation regression - a few fixes related to the CEC drivers * tag 'media/v4.8-5' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: [media] cec: fix off-by-one memset [media] staging: add MEDIA_SUPPORT dependency [media] vivid: don't handle CEC_MSG_SET_STREAM_PATH [media] media: adv7180: Fix broken interrupt register access [media] vb2: Fix allocation size of dma_parms [media] vim2m: copy the other colorspace-related fields as well [media] adv7511: fix VIC autodetect doc-rst: Remove the media docbook
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- <title>Radio Interface</title>
-
- <para>This interface is intended for AM and FM (analog) radio
-receivers and transmitters.</para>
-
- <para>Conventionally V4L2 radio devices are accessed through
-character device special files named <filename>/dev/radio</filename>
-and <filename>/dev/radio0</filename> to
-<filename>/dev/radio63</filename> with major number 81 and minor
-numbers 64 to 127.</para>
-
- <section>
- <title>Querying Capabilities</title>
-
- <para>Devices supporting the radio interface set the
-<constant>V4L2_CAP_RADIO</constant> and
-<constant>V4L2_CAP_TUNER</constant> or
-<constant>V4L2_CAP_MODULATOR</constant> flag in the
-<structfield>capabilities</structfield> field of &v4l2-capability;
-returned by the &VIDIOC-QUERYCAP; ioctl. Other combinations of
-capability flags are reserved for future extensions.</para>
- </section>
-
- <section>
- <title>Supplemental Functions</title>
-
- <para>Radio devices can support <link
-linkend="control">controls</link>, and must support the <link
-linkend="tuner">tuner or modulator</link> ioctls.</para>
-
- <para>They do not support the video input or output, audio input
-or output, video standard, cropping and scaling, compression and
-streaming parameter, or overlay ioctls. All other ioctls and I/O
-methods are reserved for future extensions.</para>
- </section>
-
- <section>
- <title>Programming</title>
-
- <para>Radio devices may have a couple audio controls (as discussed
-in <xref linkend="control" />) such as a volume control, possibly custom
-controls. Further all radio devices have one tuner or modulator (these are
-discussed in <xref linkend="tuner" />) with index number zero to select
-the radio frequency and to determine if a monaural or FM stereo
-program is received/emitted. Drivers switch automatically between AM and FM
-depending on the selected frequency. The &VIDIOC-G-TUNER; or
-&VIDIOC-G-MODULATOR; ioctl
-reports the supported frequency range.</para>
- </section>