aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/Documentation/userspace-api/media/dvb/fe-get-frontend.rst
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/userspace-api/media/dvb/fe-get-frontend.rst')
-rw-r--r--Documentation/userspace-api/media/dvb/fe-get-frontend.rst69
1 files changed, 69 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/dvb/fe-get-frontend.rst b/Documentation/userspace-api/media/dvb/fe-get-frontend.rst
new file mode 100644
index 000000000000..7968adc8e982
--- /dev/null
+++ b/Documentation/userspace-api/media/dvb/fe-get-frontend.rst
@@ -0,0 +1,69 @@
+.. Permission is granted to copy, distribute and/or modify this
+.. document under the terms of the GNU Free Documentation License,
+.. Version 1.1 or any later version published by the Free Software
+.. Foundation, with no Invariant Sections, no Front-Cover Texts
+.. and no Back-Cover Texts. A copy of the license is included at
+.. Documentation/userspace-api/media/fdl-appendix.rst.
+..
+.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
+
+.. _FE_GET_FRONTEND:
+
+***************
+FE_GET_FRONTEND
+***************
+
+Name
+====
+
+FE_GET_FRONTEND
+
+.. attention:: This ioctl is deprecated.
+
+
+Synopsis
+========
+
+.. c:function:: int ioctl(int fd, FE_GET_FRONTEND, struct dvb_frontend_parameters *p)
+ :name: FE_GET_FRONTEND
+
+
+Arguments
+=========
+
+``fd``
+ File descriptor returned by :c:func:`open() <dvb-fe-open>`.
+
+
+``p``
+ Points to parameters for tuning operation.
+
+
+Description
+===========
+
+This ioctl call queries the currently effective frontend parameters. For
+this command, read-only access to the device is sufficient.
+
+
+Return Value
+============
+
+On success 0 is returned.
+
+On error -1 is returned, and the ``errno`` variable is set
+appropriately.
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+
+
+ - .. row 1
+
+ - ``EINVAL``
+
+ - Maximum supported symbol rate reached.
+
+Generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.