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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>
71 lines
1.8 KiB
ReStructuredText
71 lines
1.8 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_GET_INFO:
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*****************
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ioctl FE_GET_INFO
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*****************
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Name
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====
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FE_GET_INFO - Query Digital TV frontend capabilities and returns information
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about the - front-end. This call only requires read-only access to the device.
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Synopsis
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========
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.. c:function:: int ioctl( int fd, FE_GET_INFO, struct dvb_frontend_info *argp )
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:name: FE_GET_INFO
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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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``argp``
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pointer to struct struct
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:c:type:`dvb_frontend_info`
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Description
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===========
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All Digital TV frontend devices support the :ref:`FE_GET_INFO` ioctl. It is
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used to identify kernel devices compatible with this specification and to
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obtain information about driver and hardware capabilities. The ioctl
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takes a pointer to dvb_frontend_info which is filled by the driver.
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When the driver is not compatible with this specification the ioctl
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returns an error.
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frontend capabilities
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=====================
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Capabilities describe what a frontend can do. Some capabilities are
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supported only on some specific frontend types.
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The frontend capabilities are described at :c:type:`fe_caps`.
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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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