Documentation/media/uapi/dvb/fe-enable-high-lnb-voltage.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _FE_ENABLE_HIGH_LNB_VOLTAGE:
   4
   5 ********************************
   6 ioctl FE_ENABLE_HIGH_LNB_VOLTAGE
   7 ********************************
   8
   9 Name
  10 ====
  11
  12 FE_ENABLE_HIGH_LNB_VOLTAGE - Select output DC level between normal LNBf voltages or higher LNBf - voltages.
  13
  14
  15 Synopsis
  16 ========
  17
  18 .. cpp:function:: int ioctl( int fd, int request, unsigned int high )
  19
  20
  21 Arguments
  22 =========
  23
  24 ``fd``
  25     File descriptor returned by :ref:`open() <frontend_f_open>`.
  26
  27 ``request``
  28     FE_ENABLE_HIGH_LNB_VOLTAGE
  29
  30 ``high``
  31     Valid flags:
  32
  33     -  0 - normal 13V and 18V.
  34
  35     -  >0 - enables slightly higher voltages instead of 13/18V, in order
  36        to compensate for long antenna cables.
  37
  38
  39 Description
  40 ===========
  41
  42 Select output DC level between normal LNBf voltages or higher LNBf
  43 voltages between 0 (normal) or a value grater than 0 for higher
  44 voltages.
  45
  46
  47 Return Value
  48 ============
  49
  50 On success 0 is returned, on error -1 and the ``errno`` variable is set
  51 appropriately. The generic error codes are described at the
  52 :ref:`Generic Error Codes <gen-errors>` chapter.