doc_rst: rename the media Sphinx suff to Documentation/media

The name of the subsystem is "media", and not "linux_tv". Also,
as we plan to add other stuff there in the future, let's
rename also the media uAPI book to media_uapi, to make it
clearer.

No functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/Documentation/media/uapi/dvb/fe-set-voltage.rst b/Documentation/media/uapi/dvb/fe-set-voltage.rst
new file mode 100644
index 000000000000..517f79bdbb4b
--- /dev/null
+++ b/Documentation/media/uapi/dvb/fe-set-voltage.rst
@@ -0,0 +1,63 @@
+.. -*- coding: utf-8; mode: rst -*-
+
+.. _FE_SET_VOLTAGE:
+
+********************
+ioctl FE_SET_VOLTAGE
+********************
+
+Name
+====
+
+FE_SET_VOLTAGE - Allow setting the DC level sent to the antenna subsystem.
+
+
+Synopsis
+========
+
+.. cpp:function:: int ioctl( int fd, int request, enum fe_sec_voltage *voltage )
+
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :ref:`open() <frontend_f_open>`.
+
+``request``
+    FE_SET_VOLTAGE
+
+``voltage``
+    pointer to enum :ref:`fe_sec_voltage <fe-sec-voltage>`
+
+    Valid values are described at enum
+    :ref:`fe_sec_voltage <fe-sec-voltage>`.
+
+
+Description
+===========
+
+This ioctl allows to set the DC voltage level sent through the antenna
+cable to 13V, 18V or off.
+
+Usually, a satellite antenna subsystems require that the digital TV
+device to send a DC voltage to feed power to the LNBf. Depending on the
+LNBf type, the polarization or the intermediate frequency (IF) of the
+LNBf can controlled by the voltage level. Other devices (for example,
+the ones that implement DISEqC and multipoint LNBf's don't need to
+control the voltage level, provided that either 13V or 18V is sent to
+power up the LNBf.
+
+NOTE: if more than one device is connected to the same antenna, setting
+a voltage level may interfere on other devices, as they may lose the
+capability of setting polarization or IF. So, on those cases, setting
+the voltage to SEC_VOLTAGE_OFF while the device is not is used is
+recommended.
+
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.