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54f38fcae5
Since 2017, there is an space reserved for userspace API,
created by changeset 1d596dee38 ("docs: Create a user-space API guide").
As the media subsystem was one of the first subsystems to use
Sphinx, until this patch, we were keeping things on a separate
place.
Let's just use the new location, as having all uAPI altogether
will likely make things easier for developers.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
60 lines
1.6 KiB
ReStructuredText
60 lines
1.6 KiB
ReStructuredText
.. Permission is granted to copy, distribute and/or modify this
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.. document under the terms of the GNU Free Documentation License,
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.. Version 1.1 or any later version published by the Free Software
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.. Foundation, with no Invariant Sections, no Front-Cover Texts
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.. and no Back-Cover Texts. A copy of the license is included at
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.. Documentation/userspace-api/media/fdl-appendix.rst.
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..
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.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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.. _FE_DISEQC_SEND_BURST:
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**************************
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ioctl FE_DISEQC_SEND_BURST
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**************************
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Name
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====
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FE_DISEQC_SEND_BURST - Sends a 22KHz tone burst for 2x1 mini DiSEqC satellite selection.
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Synopsis
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========
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.. c:function:: int ioctl( int fd, FE_DISEQC_SEND_BURST, enum fe_sec_mini_cmd tone )
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:name: FE_DISEQC_SEND_BURST
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Arguments
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=========
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``fd``
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File descriptor returned by :ref:`open() <frontend_f_open>`.
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``tone``
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An integer enumered value described at :c:type:`fe_sec_mini_cmd`.
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Description
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===========
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This ioctl is used to set the generation of a 22kHz tone burst for mini
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DiSEqC satellite selection for 2x1 switches. This call requires
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read/write permissions.
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It provides support for what's specified at
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`Digital Satellite Equipment Control (DiSEqC) - Simple "ToneBurst" Detection Circuit specification. <http://www.eutelsat.com/files/contributed/satellites/pdf/Diseqc/associated%20docs/simple_tone_burst_detec.pdf>`__
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Return Value
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============
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On success 0 is returned.
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On error -1 is returned, and the ``errno`` variable is set
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appropriately.
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Generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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