.. -*- coding: utf-8; mode: rst -*-
.. _FE_GET_INFO:
*****************
ioctl FE_GET_INFO
*****************
Name
====
FE_GET_INFO - Query DVB frontend capabilities and returns information about the - front-end. This call only requires read-only access to the device
Synopsis
========
.. c:function:: int ioctl( int fd, FE_GET_INFO, struct dvb_frontend_info *argp )
:name: FE_GET_INFO
Arguments
=========
``fd``
File descriptor returned by :ref:`open() <frontend_f_open>`.
``argp``
pointer to struct struct
:c:type:`dvb_frontend_info`
Description
===========
All DVB frontend devices support the ``FE_GET_INFO`` ioctl. It is used
to identify kernel devices compatible with this specification and to
obtain information about driver and hardware capabilities. The ioctl
takes a pointer to dvb_frontend_info which is filled by the driver.
When the driver is not compatible with this specification the ioctl
returns an error.
.. c:type:: dvb_frontend_info
.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
.. flat-table:: struct dvb_frontend_info
:header-rows: 0
:stub-columns: 0
:widths: 1 1 2
- .. row 1
- char
- name[128]
- Name of the frontend
- .. row 2
- fe_type_t
- type
- **DEPRECATED**. DVBv3 type. Should not be used on modern programs,
as a frontend may have more than one type. So, the DVBv5 API
should be used instead to enumerate and select the frontend type.
- .. row 3
- uint32_t
- frequency_min
- Minimal frequency supported by the frontend
- .. row 4
- uint32_t
- frequency_max
- Maximal frequency supported by the frontend
- .. row 5
- uint32_t
- frequency_stepsize
- Frequency step - all frequencies are multiple of this value
- .. row 6
- uint32_t
- frequency_tolerance
- Tolerance of the frequency
- .. row 7
- uint32_t
- symbol_rate_min
- Minimal symbol rate (for Cable/Satellite systems), in bauds
- .. row 8
- uint32_t
- symbol_rate_max
- Maximal symbol rate (for Cable/Satellite systems), in bauds
- .. row 9
- uint32_t
- symbol_rate_tolerance
- Maximal symbol rate tolerance, in ppm
- .. row 10
- uint32_t
- notifier_delay
- **DEPRECATED**. Not used by any driver.
- .. row 11
- enum :c:type:`fe_caps`
- caps
- Capabilities supported by the frontend
.. note::
The frequencies are specified in Hz for Terrestrial and Cable
systems. They're specified in kHz for Satellite systems
frontend capabilities
=====================
Capabilities describe what a frontend can do. Some capabilities are
supported only on some specific frontend types.
.. c:type:: fe_caps
.. tabularcolumns:: |p{6.5cm}|p{11.0cm}|
.. flat-table:: enum fe_caps
:header-rows: 1
:stub-columns: 0
- .. row 1
- ID
- Description
- .. row 2
- .. _FE-IS-STUPID:
``FE_IS_STUPID``
- There's something wrong at the frontend, and it can't report its
capabilities
- .. row 3
- .. _FE-CAN-INVERSION-AUTO:
``FE_CAN_INVERSION_AUTO``
- The frontend is capable of auto-detecting inversion
- .. row 4
- .. _FE-CAN-FEC-1-2:
``FE_CAN_FEC_1_2``
- The frontend supports FEC 1/2
- .. row 5
- .. _FE-CAN-FEC-2-3:
``FE_CAN_FEC_2_3``
- The frontend supports FEC 2/3
- .. row 6
- .. _FE-CAN-FEC-3-4:
``FE_CAN_FEC_3_4``
- The frontend supports FEC 3/4
- .. row 7
- .. _FE-CAN-FEC-4-5:
``FE_CAN_FEC_4_5``
- The frontend supports FEC 4/5
- .. row 8
- .. _FE-CAN-FEC-5-6:
``FE_CAN_FEC_5_6``
- The frontend supports FEC 5/6
- .. row 9
- .. _FE-CAN-FEC-6-7:
``FE_CAN_FEC_6_7``
- The frontend supports FEC 6/7
- .. row 10
- .. _FE-CAN-FEC-7-8:
``FE_CAN_FEC_7_8``
- The frontend supports FEC 7/8
- .. row 11
- .. _FE-CAN-FEC-8-9:
``FE_CAN_FEC_8_9``
- The frontend supports FEC 8/9
- .. row 12
- .. _FE-CAN-FEC-AUTO:
``FE_CAN_FEC_AUTO``
- The frontend can autodetect FEC.
- .. row 13
- .. _FE-CAN-QPSK:
``FE_CAN_QPSK``
- The frontend supports QPSK modulation
- .. row 14
- .. _FE-CAN-QAM-16:
``FE_CAN_QAM_16``
- The frontend supports 16-QAM modulation
- .. row 15
- .. _FE-CAN-QAM-32:
``FE_CAN_QAM_32``
- The frontend supports 32-QAM modulation
- .. row 16
- .. _FE-CAN-QAM-64:
``FE_CAN_QAM_64``
- The frontend supports 64-QAM modulation
- .. row 17
- .. _FE-CAN-QAM-128:
``FE_CAN_QAM_128``
- The frontend supports 128-QAM modulation
- .. row 18
- .. _FE-CAN-QAM-256:
``FE_CAN_QAM_256``
- The frontend supports 256-QAM modulation
- .. row 19
- .. _FE-CAN-QAM-AUTO:
``FE_CAN_QAM_AUTO``
- The frontend can autodetect modulation
- .. row 20
- .. _FE-CAN-TRANSMISSION-MODE-AUTO:
``FE_CAN_TRANSMISSION_MODE_AUTO``
- The frontend can autodetect the transmission mode
- .. row 21
- .. _FE-CAN-BANDWIDTH-AUTO:
``FE_CAN_BANDWIDTH_AUTO``
- The frontend can autodetect the bandwidth
- .. row 22
- .. _FE-CAN-GUARD-INTERVAL-AUTO:
``FE_CAN_GUARD_INTERVAL_AUTO``
- The frontend can autodetect the guard interval
- .. row 23
- .. _FE-CAN-HIERARCHY-AUTO:
``FE_CAN_HIERARCHY_AUTO``
- The frontend can autodetect hierarch
- .. row 24
- .. _FE-CAN-8VSB:
``FE_CAN_8VSB``
- The frontend supports 8-VSB modulation
- .. row 25
- .. _FE-CAN-16VSB:
``FE_CAN_16VSB``
- The frontend supports 16-VSB modulation
- .. row 26
- .. _FE-HAS-EXTENDED-CAPS:
``FE_HAS_EXTENDED_CAPS``
- Currently, unused
- .. row 27
- .. _FE-CAN-MULTISTREAM:
``FE_CAN_MULTISTREAM``
- The frontend supports multistream filtering
- .. row 28
- .. _FE-CAN-TURBO-FEC:
``FE_CAN_TURBO_FEC``
- The frontend supports turbo FEC modulation
- .. row 29
- .. _FE-CAN-2G-MODULATION:
``FE_CAN_2G_MODULATION``
- The frontend supports "2nd generation modulation" (DVB-S2/T2)>
- .. row 30
- .. _FE-NEEDS-BENDING:
``FE_NEEDS_BENDING``
- Not supported anymore, don't use it
- .. row 31
- .. _FE-CAN-RECOVER:
``FE_CAN_RECOVER``
- The frontend can recover from a cable unplug automatically
- .. row 32
- .. _FE-CAN-MUTE-TS:
``FE_CAN_MUTE_TS``
- The frontend can stop spurious TS data output
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.
