cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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fe-type-t.rst (2115B)

      1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
      2
      3*************
      4Frontend type
      5*************
      6
      7For historical reasons, frontend types are named by the type of
      8modulation used in transmission. The fontend types are given by
      9fe_type_t type, defined as:
     10
     11
     12.. c:type:: fe_type
     13
     14.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.5cm}|
     15
     16.. flat-table:: Frontend types
     17    :header-rows:  1
     18    :stub-columns: 0
     19    :widths:       3 1 4
     20
     21
     22    -  .. row 1
     23
     24       -  fe_type
     25
     26       -  Description
     27
     28       -  :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` equivalent
     29	  type
     30
     31    -  .. row 2
     32
     33       -  .. _FE-QPSK:
     34
     35	  ``FE_QPSK``
     36
     37       -  For DVB-S standard
     38
     39       -  ``SYS_DVBS``
     40
     41    -  .. row 3
     42
     43       -  .. _FE-QAM:
     44
     45	  ``FE_QAM``
     46
     47       -  For DVB-C annex A standard
     48
     49       -  ``SYS_DVBC_ANNEX_A``
     50
     51    -  .. row 4
     52
     53       -  .. _FE-OFDM:
     54
     55	  ``FE_OFDM``
     56
     57       -  For DVB-T standard
     58
     59       -  ``SYS_DVBT``
     60
     61    -  .. row 5
     62
     63       -  .. _FE-ATSC:
     64
     65	  ``FE_ATSC``
     66
     67       -  For ATSC standard (terrestrial) or for DVB-C Annex B (cable) used
     68	  in US.
     69
     70       -  ``SYS_ATSC`` (terrestrial) or ``SYS_DVBC_ANNEX_B`` (cable)
     71
     72
     73Newer formats like DVB-S2, ISDB-T, ISDB-S and DVB-T2 are not described
     74at the above, as they're supported via the new
     75:ref:`FE_GET_PROPERTY/FE_GET_SET_PROPERTY <FE_GET_PROPERTY>`
     76ioctl's, using the :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>`
     77parameter.
     78
     79In the old days, struct :c:type:`dvb_frontend_info`
     80used to contain ``fe_type_t`` field to indicate the delivery systems,
     81filled with either ``FE_QPSK, FE_QAM, FE_OFDM`` or ``FE_ATSC``. While this
     82is still filled to keep backward compatibility, the usage of this field
     83is deprecated, as it can report just one delivery system, but some
     84devices support multiple delivery systems. Please use
     85:ref:`DTV_ENUM_DELSYS <DTV-ENUM-DELSYS>` instead.
     86
     87On devices that support multiple delivery systems, struct
     88:c:type:`dvb_frontend_info`::``fe_type_t`` is
     89filled with the currently standard, as selected by the last call to
     90:ref:`FE_SET_PROPERTY <FE_GET_PROPERTY>` using the
     91:ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` property.