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1766 lines
46 KiB
XML
1766 lines
46 KiB
XML
<title>DVB Frontend API</title>
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<para>The DVB frontend device controls the tuner and DVB demodulator
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hardware. It can be accessed through <emphasis
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role="tt">/dev/dvb/adapter0/frontend0</emphasis>. Data types and and
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ioctl definitions can be accessed by including <emphasis
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role="tt">linux/dvb/frontend.h</emphasis> in your application.</para>
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<para>DVB frontends come in three varieties: DVB-S (satellite), DVB-C
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(cable) and DVB-T (terrestrial). Transmission via the internet (DVB-IP)
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is not yet handled by this API but a future extension is possible. For
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DVB-S the frontend device also supports satellite equipment control
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(SEC) via DiSEqC and V-SEC protocols. The DiSEqC (digital SEC)
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specification is available from
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<ulink url="http://www.eutelsat.com/satellites/4_5_5.html">Eutelsat</ulink>.</para>
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<para>Note that the DVB API may also be used for MPEG decoder-only PCI
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cards, in which case there exists no frontend device.</para>
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<section id="frontend_types">
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<title>Frontend Data Types</title>
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<section id="frontend_type">
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<title>frontend type</title>
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<para>For historical reasons frontend types are named after the type of modulation used in
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transmission.</para>
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<programlisting>
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typedef enum fe_type {
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FE_QPSK, /⋆ DVB-S ⋆/
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FE_QAM, /⋆ DVB-C ⋆/
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FE_OFDM /⋆ DVB-T ⋆/
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} fe_type_t;
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</programlisting>
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</section>
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<section id="frontend_caps">
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<title>frontend capabilities</title>
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<para>Capabilities describe what a frontend can do. Some capabilities can only be supported for
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a specific frontend type.</para>
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<programlisting>
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typedef enum fe_caps {
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FE_IS_STUPID = 0,
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FE_CAN_INVERSION_AUTO = 0x1,
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FE_CAN_FEC_1_2 = 0x2,
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FE_CAN_FEC_2_3 = 0x4,
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FE_CAN_FEC_3_4 = 0x8,
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FE_CAN_FEC_4_5 = 0x10,
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FE_CAN_FEC_5_6 = 0x20,
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FE_CAN_FEC_6_7 = 0x40,
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FE_CAN_FEC_7_8 = 0x80,
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FE_CAN_FEC_8_9 = 0x100,
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FE_CAN_FEC_AUTO = 0x200,
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FE_CAN_QPSK = 0x400,
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FE_CAN_QAM_16 = 0x800,
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FE_CAN_QAM_32 = 0x1000,
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FE_CAN_QAM_64 = 0x2000,
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FE_CAN_QAM_128 = 0x4000,
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FE_CAN_QAM_256 = 0x8000,
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FE_CAN_QAM_AUTO = 0x10000,
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FE_CAN_TRANSMISSION_MODE_AUTO = 0x20000,
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FE_CAN_BANDWIDTH_AUTO = 0x40000,
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FE_CAN_GUARD_INTERVAL_AUTO = 0x80000,
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FE_CAN_HIERARCHY_AUTO = 0x100000,
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FE_CAN_MUTE_TS = 0x80000000,
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FE_CAN_CLEAN_SETUP = 0x40000000
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} fe_caps_t;
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</programlisting>
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</section>
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<section id="frontend_info">
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<title>frontend information</title>
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<para>Information about the frontend ca be queried with FE_GET_INFO.</para>
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<programlisting>
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struct dvb_frontend_info {
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char name[128];
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fe_type_t type;
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uint32_t frequency_min;
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uint32_t frequency_max;
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uint32_t frequency_stepsize;
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uint32_t frequency_tolerance;
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uint32_t symbol_rate_min;
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uint32_t symbol_rate_max;
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uint32_t symbol_rate_tolerance; /⋆ ppm ⋆/
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uint32_t notifier_delay; /⋆ ms ⋆/
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fe_caps_t caps;
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};
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</programlisting>
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</section>
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<section id="frontend_diseqc">
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<title>diseqc master command</title>
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<para>A message sent from the frontend to DiSEqC capable equipment.</para>
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<programlisting>
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struct dvb_diseqc_master_cmd {
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uint8_t msg [6]; /⋆ { framing, address, command, data[3] } ⋆/
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uint8_t msg_len; /⋆ valid values are 3...6 ⋆/
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};
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</programlisting>
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</section>
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<section role="subsection">
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<title>diseqc slave reply</title>
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<para>A reply to the frontend from DiSEqC 2.0 capable equipment.</para>
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<programlisting>
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struct dvb_diseqc_slave_reply {
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uint8_t msg [4]; /⋆ { framing, data [3] } ⋆/
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uint8_t msg_len; /⋆ valid values are 0...4, 0 means no msg ⋆/
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int timeout; /⋆ return from ioctl after timeout ms with ⋆/
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}; /⋆ errorcode when no message was received ⋆/
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</programlisting>
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</section>
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<section id="frontend_diseqc_slave_reply">
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<title>diseqc slave reply</title>
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<para>The voltage is usually used with non-DiSEqC capable LNBs to switch the polarzation
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(horizontal/vertical). When using DiSEqC epuipment this voltage has to be switched
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consistently to the DiSEqC commands as described in the DiSEqC spec.</para>
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<programlisting>
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typedef enum fe_sec_voltage {
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SEC_VOLTAGE_13,
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SEC_VOLTAGE_18
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} fe_sec_voltage_t;
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</programlisting>
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</section>
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<section id="frontend_sec_tone">
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<title>SEC continuous tone</title>
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<para>The continous 22KHz tone is usually used with non-DiSEqC capable LNBs to switch the
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high/low band of a dual-band LNB. When using DiSEqC epuipment this voltage has to
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be switched consistently to the DiSEqC commands as described in the DiSEqC
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spec.</para>
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<programlisting>
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typedef enum fe_sec_tone_mode {
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SEC_TONE_ON,
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SEC_TONE_OFF
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} fe_sec_tone_mode_t;
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</programlisting>
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</section>
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<section id="frontend_sec_burst">
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<title>SEC tone burst</title>
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<para>The 22KHz tone burst is usually used with non-DiSEqC capable switches to select
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between two connected LNBs/satellites. When using DiSEqC epuipment this voltage has to
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be switched consistently to the DiSEqC commands as described in the DiSEqC
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spec.</para>
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<programlisting>
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typedef enum fe_sec_mini_cmd {
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SEC_MINI_A,
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SEC_MINI_B
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} fe_sec_mini_cmd_t;
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</programlisting>
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<para></para>
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</section>
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<section id="frontend_status">
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<title>frontend status</title>
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<para>Several functions of the frontend device use the fe_status data type defined
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by</para>
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<programlisting>
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typedef enum fe_status {
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FE_HAS_SIGNAL = 0x01, /⋆ found something above the noise level ⋆/
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FE_HAS_CARRIER = 0x02, /⋆ found a DVB signal ⋆/
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FE_HAS_VITERBI = 0x04, /⋆ FEC is stable ⋆/
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FE_HAS_SYNC = 0x08, /⋆ found sync bytes ⋆/
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FE_HAS_LOCK = 0x10, /⋆ everything's working... ⋆/
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FE_TIMEDOUT = 0x20, /⋆ no lock within the last ~2 seconds ⋆/
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FE_REINIT = 0x40 /⋆ frontend was reinitialized, ⋆/
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} fe_status_t; /⋆ application is recommned to reset ⋆/
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</programlisting>
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<para>to indicate the current state and/or state changes of the frontend hardware.
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</para>
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</section>
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<section id="frontend_params">
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<title>frontend parameters</title>
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<para>The kind of parameters passed to the frontend device for tuning depend on
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the kind of hardware you are using. All kinds of parameters are combined as an
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union in the FrontendParameters structure:</para>
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<programlisting>
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struct dvb_frontend_parameters {
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uint32_t frequency; /⋆ (absolute) frequency in Hz for QAM/OFDM ⋆/
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/⋆ intermediate frequency in kHz for QPSK ⋆/
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fe_spectral_inversion_t inversion;
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union {
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struct dvb_qpsk_parameters qpsk;
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struct dvb_qam_parameters qam;
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struct dvb_ofdm_parameters ofdm;
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} u;
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};
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</programlisting>
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<para>For satellite QPSK frontends you have to use the <constant>QPSKParameters</constant> member defined by</para>
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<programlisting>
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struct dvb_qpsk_parameters {
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uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/
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fe_code_rate_t fec_inner; /⋆ forward error correction (see above) ⋆/
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};
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</programlisting>
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<para>for cable QAM frontend you use the <constant>QAMParameters</constant> structure</para>
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<programlisting>
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struct dvb_qam_parameters {
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uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/
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fe_code_rate_t fec_inner; /⋆ forward error correction (see above) ⋆/
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fe_modulation_t modulation; /⋆ modulation type (see above) ⋆/
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};
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</programlisting>
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<para>DVB-T frontends are supported by the <constant>OFDMParamters</constant> structure
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</para>
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<programlisting>
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struct dvb_ofdm_parameters {
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fe_bandwidth_t bandwidth;
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fe_code_rate_t code_rate_HP; /⋆ high priority stream code rate ⋆/
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fe_code_rate_t code_rate_LP; /⋆ low priority stream code rate ⋆/
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fe_modulation_t constellation; /⋆ modulation type (see above) ⋆/
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fe_transmit_mode_t transmission_mode;
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fe_guard_interval_t guard_interval;
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fe_hierarchy_t hierarchy_information;
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};
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</programlisting>
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<para>In the case of QPSK frontends the <constant>Frequency</constant> field specifies the intermediate
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frequency, i.e. the offset which is effectively added to the local oscillator frequency (LOF) of
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the LNB. The intermediate frequency has to be specified in units of kHz. For QAM and
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OFDM frontends the Frequency specifies the absolute frequency and is given in
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Hz.
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</para>
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<para>The Inversion field can take one of these values:
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</para>
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<programlisting>
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typedef enum fe_spectral_inversion {
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INVERSION_OFF,
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INVERSION_ON,
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INVERSION_AUTO
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} fe_spectral_inversion_t;
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</programlisting>
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<para>It indicates if spectral inversion should be presumed or not. In the automatic setting
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(<constant>INVERSION_AUTO</constant>) the hardware will try to figure out the correct setting by
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itself.
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</para>
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<para>The possible values for the <constant>FEC_inner</constant> field are
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</para>
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<programlisting>
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typedef enum fe_code_rate {
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FEC_NONE = 0,
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FEC_1_2,
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FEC_2_3,
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FEC_3_4,
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FEC_4_5,
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FEC_5_6,
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FEC_6_7,
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FEC_7_8,
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FEC_8_9,
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FEC_AUTO
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} fe_code_rate_t;
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</programlisting>
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<para>which correspond to error correction rates of 1/2, 2/3, etc., no error correction or auto
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detection.
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</para>
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<para>For cable and terrestrial frontends (QAM and OFDM) one also has to specify the quadrature
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modulation mode which can be one of the following:
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</para>
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<programlisting>
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typedef enum fe_modulation {
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QPSK,
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QAM_16,
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QAM_32,
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QAM_64,
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QAM_128,
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QAM_256,
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QAM_AUTO
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} fe_modulation_t;
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</programlisting>
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<para>Finally, there are several more parameters for OFDM:
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</para>
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<programlisting>
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typedef enum fe_transmit_mode {
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TRANSMISSION_MODE_2K,
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TRANSMISSION_MODE_8K,
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TRANSMISSION_MODE_AUTO
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} fe_transmit_mode_t;
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</programlisting>
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<programlisting>
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typedef enum fe_bandwidth {
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BANDWIDTH_8_MHZ,
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BANDWIDTH_7_MHZ,
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BANDWIDTH_6_MHZ,
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BANDWIDTH_AUTO
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} fe_bandwidth_t;
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</programlisting>
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<programlisting>
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typedef enum fe_guard_interval {
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GUARD_INTERVAL_1_32,
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GUARD_INTERVAL_1_16,
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GUARD_INTERVAL_1_8,
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GUARD_INTERVAL_1_4,
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GUARD_INTERVAL_AUTO
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} fe_guard_interval_t;
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</programlisting>
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<programlisting>
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typedef enum fe_hierarchy {
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HIERARCHY_NONE,
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HIERARCHY_1,
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HIERARCHY_2,
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HIERARCHY_4,
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HIERARCHY_AUTO
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} fe_hierarchy_t;
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</programlisting>
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</section>
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<section id="frontend_events">
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<title>frontend events</title>
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<programlisting>
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struct dvb_frontend_event {
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fe_status_t status;
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struct dvb_frontend_parameters parameters;
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};
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</programlisting>
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</section>
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</section>
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<section id="frontend_fcalls">
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<title>Frontend Function Calls</title>
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<section id="frontend_f_open">
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<title>open()</title>
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<para>DESCRIPTION</para>
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<informaltable><tgroup cols="1"><tbody><row>
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<entry align="char">
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<para>This system call opens a named frontend device (/dev/dvb/adapter0/frontend0)
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for subsequent use. Usually the first thing to do after a successful open is to
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find out the frontend type with FE_GET_INFO.</para>
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<para>The device can be opened in read-only mode, which only allows monitoring of
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device status and statistics, or read/write mode, which allows any kind of use
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(e.g. performing tuning operations.)
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</para>
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<para>In a system with multiple front-ends, it is usually the case that multiple devices
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cannot be open in read/write mode simultaneously. As long as a front-end
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device is opened in read/write mode, other open() calls in read/write mode will
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either fail or block, depending on whether non-blocking or blocking mode was
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specified. A front-end device opened in blocking mode can later be put into
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non-blocking mode (and vice versa) using the F_SETFL command of the fcntl
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system call. This is a standard system call, documented in the Linux manual
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page for fcntl. When an open() call has succeeded, the device will be ready
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for use in the specified mode. This implies that the corresponding hardware is
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powered up, and that other front-ends may have been powered down to make
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that possible.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>SYNOPSIS</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>int open(const char ⋆deviceName, int flags);</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>PARAMETERS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>const char
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*deviceName</para>
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</entry><entry
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align="char">
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<para>Name of specific video device.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>int flags</para>
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</entry><entry
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align="char">
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<para>A bit-wise OR of the following flags:</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>O_RDONLY read-only access</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>O_RDWR read/write access</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>O_NONBLOCK open in non-blocking mode</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>(blocking mode is the default)</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>ERRORS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>ENODEV</para>
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</entry><entry
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align="char">
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<para>Device driver not loaded/available.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>EINTERNAL</para>
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</entry><entry
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align="char">
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<para>Internal error.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>EBUSY</para>
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</entry><entry
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align="char">
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<para>Device or resource busy.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>EINVAL</para>
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</entry><entry
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align="char">
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<para>Invalid argument.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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</section>
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<section id="frontend_f_close">
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<title>close()</title>
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<para>DESCRIPTION
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>This system call closes a previously opened front-end device. After closing
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a front-end device, its corresponding hardware might be powered down
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automatically.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>SYNOPSIS
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>int close(int fd);</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>PARAMETERS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>int fd</para>
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</entry><entry
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align="char">
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<para>File descriptor returned by a previous call to open().</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>ERRORS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>EBADF</para>
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</entry><entry
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align="char">
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|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_read_status">
|
|
<title>FE_READ_STATUS</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call returns status information about the front-end. This call only
|
|
requires read-only access to the device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = FE_READ_STATUS,
|
|
fe_status_t ⋆status);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_READ_STATUS for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>struct fe_status_t
|
|
*status</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Points to the location where the front-end status word is
|
|
to be stored.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>status points to invalid address.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_read_ber">
|
|
<title>FE_READ_BER</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call returns the bit error rate for the signal currently
|
|
received/demodulated by the front-end. For this command, read-only access to
|
|
the device is sufficient.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = FE_READ_BER,
|
|
uint32_t ⋆ber);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_READ_BER for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>uint32_t *ber</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The bit error rate is stored into *ber.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>ber points to invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>ENOSIGNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>There is no signal, thus no meaningful bit error rate. Also
|
|
returned if the front-end is not turned on.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>ENOSYS</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Function not available for this device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_read_snr">
|
|
<title>FE_READ_SNR</title>
|
|
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call returns the signal-to-noise ratio for the signal currently received
|
|
by the front-end. For this command, read-only access to the device is sufficient.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = FE_READ_SNR, int16_t
|
|
⋆snr);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_READ_SNR for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int16_t *snr</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The signal-to-noise ratio is stored into *snr.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>snr points to invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>ENOSIGNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>There is no signal, thus no meaningful signal strength
|
|
value. Also returned if front-end is not turned on.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>ENOSYS</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Function not available for this device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_read_signal_strength">
|
|
<title>FE_READ_SIGNAL_STRENGTH</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call returns the signal strength value for the signal currently received
|
|
by the front-end. For this command, read-only access to the device is sufficient.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl( int fd, int request =
|
|
FE_READ_SIGNAL_STRENGTH, int16_t ⋆strength);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_READ_SIGNAL_STRENGTH for this
|
|
command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int16_t *strength</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The signal strength value is stored into *strength.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>status points to invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>ENOSIGNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>There is no signal, thus no meaningful signal strength
|
|
value. Also returned if front-end is not turned on.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>ENOSYS</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Function not available for this device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_read_ub">
|
|
<title>FE_READ_UNCORRECTED_BLOCKS</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call returns the number of uncorrected blocks detected by the device
|
|
driver during its lifetime. For meaningful measurements, the increment in block
|
|
count during a specific time interval should be calculated. For this command,
|
|
read-only access to the device is sufficient.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>Note that the counter will wrap to zero after its maximum count has been
|
|
reached.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl( int fd, int request =
|
|
FE_READ_UNCORRECTED_BLOCKS, uint32_t ⋆ublocks);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_READ_UNCORRECTED_BLOCKS for this
|
|
command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>uint32_t *ublocks</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The total number of uncorrected blocks seen by the driver
|
|
so far.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>ublocks points to invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>ENOSYS</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Function not available for this device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_set_fe">
|
|
<title>FE_SET_FRONTEND</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call starts a tuning operation using specified parameters. The result
|
|
of this call will be successful if the parameters were valid and the tuning could
|
|
be initiated. The result of the tuning operation in itself, however, will arrive
|
|
asynchronously as an event (see documentation for FE_GET_EVENT and
|
|
FrontendEvent.) If a new FE_SET_FRONTEND operation is initiated before
|
|
the previous one was completed, the previous operation will be aborted in favor
|
|
of the new one. This command requires read/write access to the device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = FE_SET_FRONTEND,
|
|
struct dvb_frontend_parameters ⋆p);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_SET_FRONTEND for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>struct
|
|
dvb_frontend_parameters
|
|
*p</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Points to parameters for tuning operation.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>p points to invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Maximum supported symbol rate reached.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_get_fe">
|
|
<title>FE_GET_FRONTEND</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call queries the currently effective frontend parameters. For this
|
|
command, read-only access to the device is sufficient.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = FE_GET_FRONTEND,
|
|
struct dvb_frontend_parameters ⋆p);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_SET_FRONTEND for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>struct
|
|
dvb_frontend_parameters
|
|
*p</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Points to parameters for tuning operation.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>p points to invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Maximum supported symbol rate reached.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
</section>
|
|
|
|
<section id="frontend_get_event">
|
|
<title>FE_GET_EVENT</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call returns a frontend event if available. If an event is not
|
|
available, the behavior depends on whether the device is in blocking or
|
|
non-blocking mode. In the latter case, the call fails immediately with errno
|
|
set to EWOULDBLOCK. In the former case, the call blocks until an event
|
|
becomes available.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>The standard Linux poll() and/or select() system calls can be used with the
|
|
device file descriptor to watch for new events. For select(), the file descriptor
|
|
should be included in the exceptfds argument, and for poll(), POLLPRI should
|
|
be specified as the wake-up condition. Since the event queue allocated is
|
|
rather small (room for 8 events), the queue must be serviced regularly to avoid
|
|
overflow. If an overflow happens, the oldest event is discarded from the queue,
|
|
and an error (EOVERFLOW) occurs the next time the queue is read. After
|
|
reporting the error condition in this fashion, subsequent FE_GET_EVENT
|
|
calls will return events from the queue as usual.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>For the sake of implementation simplicity, this command requires read/write
|
|
access to the device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = QPSK_GET_EVENT,
|
|
struct dvb_frontend_event ⋆ev);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_GET_EVENT for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>struct
|
|
dvb_frontend_event
|
|
*ev</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Points to the location where the event,</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
</entry><entry
|
|
align="char">
|
|
<para>if any, is to be stored.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>ev points to invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EWOULDBLOCK</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>There is no event pending, and the device is in
|
|
non-blocking mode.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EOVERFLOW</para>
|
|
</entry><entry
|
|
align="char">
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
</entry><entry
|
|
align="char">
|
|
<para>Overflow in event queue - one or more events were lost.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_get_info">
|
|
<title>FE_GET_INFO</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call returns information about the front-end. This call only requires
|
|
read-only access to the device.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para> int ioctl(int fd, int request = FE_GET_INFO, struct
|
|
dvb_frontend_info ⋆info);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_GET_INFO for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>struct
|
|
dvb_frontend_info
|
|
*info</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Points to the location where the front-end information is
|
|
to be stored.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid open file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>info points to invalid address.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_diseqc_reset_overload">
|
|
<title>FE_DISEQC_RESET_OVERLOAD</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>If the bus has been automatically powered off due to power overload, this ioctl
|
|
call restores the power to the bus. The call requires read/write access to the
|
|
device. This call has no effect if the device is manually powered off. Not all
|
|
DVB adapters support this ioctl.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request =
|
|
FE_DISEQC_RESET_OVERLOAD);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_DISEQC_RESET_OVERLOAD for this
|
|
command.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EPERM</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Permission denied (needs read/write access).</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINTERNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Internal error in the device driver.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_diseqc_send_master_cmd">
|
|
<title>FE_DISEQC_SEND_MASTER_CMD</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call is used to send a a DiSEqC command.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request =
|
|
FE_DISEQC_SEND_MASTER_CMD, struct
|
|
dvb_diseqc_master_cmd ⋆cmd);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_DISEQC_SEND_MASTER_CMD for this
|
|
command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>struct
|
|
dvb_diseqc_master_cmd
|
|
*cmd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Pointer to the command to be transmitted.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Seq points to an invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The data structure referred to by seq is invalid in some
|
|
way.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EPERM</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Permission denied (needs read/write access).</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINTERNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Internal error in the device driver.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_diseqc_recv_slave_reply">
|
|
<title>FE_DISEQC_RECV_SLAVE_REPLY</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call is used to receive reply to a DiSEqC 2.0 command.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request =
|
|
FE_DISEQC_RECV_SLAVE_REPLY, struct
|
|
dvb_diseqc_slave_reply ⋆reply);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_DISEQC_RECV_SLAVE_REPLY for this
|
|
command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>struct
|
|
dvb_diseqc_slave_reply
|
|
*reply</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Pointer to the command to be received.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Seq points to an invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The data structure referred to by seq is invalid in some
|
|
way.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EPERM</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Permission denied (needs read/write access).</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINTERNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Internal error in the device driver.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_diseqc_send_burst">
|
|
<title>FE_DISEQC_SEND_BURST</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This ioctl call is used to send a 22KHz tone burst.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request =
|
|
FE_DISEQC_SEND_BURST, fe_sec_mini_cmd_t burst);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_DISEQC_SEND_BURST for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>fe_sec_mini_cmd_t
|
|
burst</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>burst A or B.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>EBADF</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>fd is not a valid file descriptor.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EFAULT</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Seq points to an invalid address.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The data structure referred to by seq is invalid in some
|
|
way.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EPERM</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Permission denied (needs read/write access).</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINTERNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Internal error in the device driver.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_set_tone">
|
|
<title>FE_SET_TONE</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This call is used to set the generation of the continuous 22kHz tone. This call
|
|
requires read/write permissions.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = FE_SET_TONE,
|
|
fe_sec_tone_mode_t tone);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_SET_TONE for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>fe_sec_tone_mode_t
|
|
tone</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The requested tone generation mode (on/off).</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>ENODEV</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Device driver not loaded/available.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EBUSY</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Device or resource busy.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Invalid argument.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EPERM</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File not opened with read permissions.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINTERNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Internal error in the device driver.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="fe_set_voltage">
|
|
<title>FE_SET_VOLTAGE</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>This call is used to set the bus voltage. This call requires read/write
|
|
permissions.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request = FE_SET_VOLTAGE,
|
|
fe_sec_voltage_t voltage);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_SET_VOLTAGE for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>fe_sec_voltage_t
|
|
voltage</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The requested bus voltage.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>ENODEV</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Device driver not loaded/available.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EBUSY</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Device or resource busy.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Invalid argument.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EPERM</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File not opened with read permissions.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINTERNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Internal error in the device driver.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
|
|
<section id="frontend_enable_high_lnb_volt">
|
|
<title>FE_ENABLE_HIGH_LNB_VOLTAGE</title>
|
|
<para>DESCRIPTION
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>If high != 0 enables slightly higher voltages instead of 13/18V (to compensate
|
|
for long cables). This call requires read/write permissions. Not all DVB
|
|
adapters support this ioctl.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>SYNOPSIS
|
|
</para>
|
|
<informaltable><tgroup cols="1"><tbody><row><entry
|
|
align="char">
|
|
<para>int ioctl(int fd, int request =
|
|
FE_ENABLE_HIGH_LNB_VOLTAGE, int high);</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>PARAMETERS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>int fd</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File descriptor returned by a previous call to open().</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int request</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Equals FE_SET_VOLTAGE for this command.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>int high</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>The requested bus voltage.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
|
|
<para>ERRORS
|
|
</para>
|
|
<informaltable><tgroup cols="2"><tbody><row><entry
|
|
align="char">
|
|
<para>ENODEV</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Device driver not loaded/available.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EBUSY</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Device or resource busy.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINVAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Invalid argument.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EPERM</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>File not opened with read permissions.</para>
|
|
</entry>
|
|
</row><row><entry
|
|
align="char">
|
|
<para>EINTERNAL</para>
|
|
</entry><entry
|
|
align="char">
|
|
<para>Internal error in the device driver.</para>
|
|
</entry>
|
|
</row></tbody></tgroup></informaltable>
|
|
</section>
|
|
</section>
|