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Diffstat (limited to 'Documentation/media/uapi/dvb/fe-set-voltage.rst')
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diff --git a/Documentation/media/uapi/dvb/fe-set-voltage.rst b/Documentation/media/uapi/dvb/fe-set-voltage.rst deleted file mode 100644 index c81a8e6a59aa..000000000000 --- a/Documentation/media/uapi/dvb/fe-set-voltage.rst +++ /dev/null @@ -1,69 +0,0 @@ -.. 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/media/uapi/fdl-appendix.rst. -.. -.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections - -.. _FE_SET_VOLTAGE: - -******************** -ioctl FE_SET_VOLTAGE -******************** - -Name -==== - -FE_SET_VOLTAGE - Allow setting the DC level sent to the antenna subsystem. - - -Synopsis -======== - -.. c:function:: int ioctl( int fd, FE_SET_VOLTAGE, enum fe_sec_voltage voltage ) - :name: FE_SET_VOLTAGE - - -Arguments -========= - -``fd`` - File descriptor returned by :ref:`open() <frontend_f_open>`. - -``voltage`` - an integer enumered value described at :c:type:`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. - -.. attention:: 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 is returned, and the ``errno`` variable is set -appropriately. - -Generic error codes are described at the -:ref:`Generic Error Codes <gen-errors>` chapter. |