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