diff options
Diffstat (limited to 'Documentation/DocBook/media/dvb/frontend_legacy_api.xml')
| -rw-r--r-- | Documentation/DocBook/media/dvb/frontend_legacy_api.xml | 654 |
1 files changed, 654 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/dvb/frontend_legacy_api.xml b/Documentation/DocBook/media/dvb/frontend_legacy_api.xml new file mode 100644 index 000000000000..8fadf3a4ba44 --- /dev/null +++ b/Documentation/DocBook/media/dvb/frontend_legacy_api.xml @@ -0,0 +1,654 @@ +<section id="frontend_legacy_types"> +<title>Frontend Legacy Data Types</title> + +<section id="fe-type-t"> +<title>Frontend type</title> + +<para>For historical reasons, frontend types are named by the type of modulation + used in transmission. The fontend types are given by fe_type_t type, defined as:</para> + +<table pgwide="1" frame="none" id="fe-type"> +<title>Frontend types</title> +<tgroup cols="3"> + &cs-def; + <thead> + <row> + <entry>fe_type</entry> + <entry>Description</entry> + <entry><link linkend="DTV-DELIVERY-SYSTEM">DTV_DELIVERY_SYSTEM</link> equivalent type</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry id="FE-QPSK"><constant>FE_QPSK</constant></entry> + <entry>For DVB-S standard</entry> + <entry><constant>SYS_DVBS</constant></entry> + </row> + <row> + <entry id="FE-QAM"><constant>FE_QAM</constant></entry> + <entry>For DVB-C annex A standard</entry> + <entry><constant>SYS_DVBC_ANNEX_A</constant></entry> + </row> + <row> + <entry id="FE-OFDM"><constant>FE_OFDM</constant></entry> + <entry>For DVB-T standard</entry> + <entry><constant>SYS_DVBT</constant></entry> + </row> + <row> + <entry id="FE-ATSC"><constant>FE_ATSC</constant></entry> + <entry>For ATSC standard (terrestrial) or for DVB-C Annex B (cable) used in US.</entry> + <entry><constant>SYS_ATSC</constant> (terrestrial) or <constant>SYS_DVBC_ANNEX_B</constant> (cable)</entry> + </row> +</tbody></tgroup></table> + +<para>Newer formats like DVB-S2, ISDB-T, ISDB-S and DVB-T2 are not described at the above, as they're +supported via the new <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY/FE_GET_SET_PROPERTY</link> ioctl's, using the <link linkend="DTV-DELIVERY-SYSTEM">DTV_DELIVERY_SYSTEM</link> parameter. +</para> + +<para>In the old days, &dvb-frontend-info; used to contain + <constant>fe_type_t</constant> field to indicate the delivery systems, + filled with either FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC. While this is + still filled to keep backward compatibility, the usage of this + field is deprecated, as it can report just one delivery system, but some + devices support multiple delivery systems. Please use + <link linkend="DTV-ENUM-DELSYS">DTV_ENUM_DELSYS</link> instead. +</para> +<para>On devices that support multiple delivery systems, + &dvb-frontend-info;::<constant>fe_type_t</constant> is filled with the + currently standard, as selected by the last call to + <link linkend="FE_GET_PROPERTY">FE_SET_PROPERTY</link> + using the &DTV-DELIVERY-SYSTEM; property.</para> +</section> + +<section id="fe-bandwidth-t"> +<title>Frontend bandwidth</title> + +<table pgwide="1" frame="none" id="fe-bandwidth"> + <title>enum fe_bandwidth</title> + <tgroup cols="2"> + &cs-def; + <thead> + <row> + <entry>ID</entry> + <entry>Description</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry id="BANDWIDTH-AUTO"><constant>BANDWIDTH_AUTO</constant></entry> + <entry>Autodetect bandwidth (if supported)</entry> + </row><row> + <entry id="BANDWIDTH-1-712-MHZ"><constant>BANDWIDTH_1_712_MHZ</constant></entry> + <entry>1.712 MHz</entry> + </row><row> + <entry id="BANDWIDTH-5-MHZ"><constant>BANDWIDTH_5_MHZ</constant></entry> + <entry>5 MHz</entry> + </row><row> + <entry id="BANDWIDTH-6-MHZ"><constant>BANDWIDTH_6_MHZ</constant></entry> + <entry>6 MHz</entry> + </row><row> + <entry id="BANDWIDTH-7-MHZ"><constant>BANDWIDTH_7_MHZ</constant></entry> + <entry>7 MHz</entry> + </row><row> + <entry id="BANDWIDTH-8-MHZ"><constant>BANDWIDTH_8_MHZ</constant></entry> + <entry>8 MHz</entry> + </row><row> + <entry id="BANDWIDTH-10-MHZ"><constant>BANDWIDTH_10_MHZ</constant></entry> + <entry>10 MHz</entry> + </row> + </tbody> + </tgroup> +</table> + +</section> + +<section id="dvb-frontend-parameters"> +<title>frontend parameters</title> +<para>The kind of parameters passed to the frontend device for tuning depend on +the kind of hardware you are using.</para> +<para>The struct <constant>dvb_frontend_parameters</constant> uses an +union with specific per-system parameters. However, as newer delivery systems +required more data, the structure size weren't enough to fit, and just +extending its size would break the existing applications. So, those parameters +were replaced by the usage of <link linkend="FE_GET_PROPERTY"> +<constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant></link> ioctl's. The +new API is flexible enough to add new parameters to existing delivery systems, +and to add newer delivery systems.</para> +<para>So, newer applications should use <link linkend="FE_GET_PROPERTY"> +<constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant></link> instead, in +order to be able to support the newer System Delivery like DVB-S2, DVB-T2, +DVB-C2, ISDB, etc.</para> +<para>All kinds of parameters are combined as an union in the FrontendParameters structure: +<programlisting> +struct dvb_frontend_parameters { + uint32_t frequency; /⋆ (absolute) frequency in Hz for QAM/OFDM ⋆/ + /⋆ intermediate frequency in kHz for QPSK ⋆/ + &fe-spectral-inversion-t; inversion; + union { + struct dvb_qpsk_parameters qpsk; + struct dvb_qam_parameters qam; + struct dvb_ofdm_parameters ofdm; + struct dvb_vsb_parameters vsb; + } u; +}; +</programlisting></para> +<para>In the case of QPSK frontends the <constant>frequency</constant> field specifies the intermediate +frequency, i.e. the offset which is effectively added to the local oscillator frequency (LOF) of +the LNB. The intermediate frequency has to be specified in units of kHz. For QAM and +OFDM frontends the <constant>frequency</constant> specifies the absolute frequency and is given in Hz. +</para> + +<section id="dvb-qpsk-parameters"> +<title>QPSK parameters</title> +<para>For satellite QPSK frontends you have to use the <constant>dvb_qpsk_parameters</constant> structure:</para> +<programlisting> + struct dvb_qpsk_parameters { + uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/ + &fe-code-rate-t; fec_inner; /⋆ forward error correction (see above) ⋆/ + }; +</programlisting> +</section> + +<section id="dvb-qam-parameters"> +<title>QAM parameters</title> +<para>for cable QAM frontend you use the <constant>dvb_qam_parameters</constant> structure:</para> +<programlisting> + struct dvb_qam_parameters { + uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/ + &fe-code-rate-t; fec_inner; /⋆ forward error correction (see above) ⋆/ + &fe-modulation-t; modulation; /⋆ modulation type (see above) ⋆/ + }; +</programlisting> +</section> + +<section id="dvb-vsb-parameters"> +<title>VSB parameters</title> +<para>ATSC frontends are supported by the <constant>dvb_vsb_parameters</constant> structure:</para> +<programlisting> +struct dvb_vsb_parameters { + &fe-modulation-t; modulation; /⋆ modulation type (see above) ⋆/ +}; +</programlisting> +</section> + +<section id="dvb-ofdm-parameters"> +<title>OFDM parameters</title> +<para>DVB-T frontends are supported by the <constant>dvb_ofdm_parameters</constant> structure:</para> +<programlisting> + struct dvb_ofdm_parameters { + &fe-bandwidth-t; bandwidth; + &fe-code-rate-t; code_rate_HP; /⋆ high priority stream code rate ⋆/ + &fe-code-rate-t; code_rate_LP; /⋆ low priority stream code rate ⋆/ + &fe-modulation-t; constellation; /⋆ modulation type (see above) ⋆/ + &fe-transmit-mode-t; transmission_mode; + &fe-guard-interval-t; guard_interval; + &fe-hierarchy-t; hierarchy_information; + }; +</programlisting> +</section> +</section> + +<section id="dvb-frontend-event"> +<title>frontend events</title> + <programlisting> + struct dvb_frontend_event { + fe_status_t status; + struct dvb_frontend_parameters parameters; + }; +</programlisting> + </section> +</section> + +<section id="frontend_legacy_fcalls"> +<title>Frontend Legacy Function Calls</title> + +<para>Those functions are defined at DVB version 3. The support is kept in + the kernel due to compatibility issues only. Their usage is strongly + not recommended</para> + +<section id="FE_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 = <link linkend="FE_READ_BER">FE_READ_BER</link>, + 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 <link linkend="FE_READ_BER">FE_READ_BER</link> 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> + +&return-value-dvb; +</section> + +<section id="FE_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 = <link linkend="FE_READ_SNR">FE_READ_SNR</link>, uint16_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 <link linkend="FE_READ_SNR">FE_READ_SNR</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>uint16_t *snr</para> +</entry><entry + align="char"> +<para>The signal-to-noise ratio is stored into *snr.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_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 = + <link linkend="FE_READ_SIGNAL_STRENGTH">FE_READ_SIGNAL_STRENGTH</link>, uint16_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 <link linkend="FE_READ_SIGNAL_STRENGTH">FE_READ_SIGNAL_STRENGTH</link> for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>uint16_t *strength</para> +</entry><entry + align="char"> +<para>The signal strength value is stored into *strength.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_READ_UNCORRECTED_BLOCKS"> +<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 = + <link linkend="FE_READ_UNCORRECTED_BLOCKS">FE_READ_UNCORRECTED_BLOCKS</link>, 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 <link linkend="FE_READ_UNCORRECTED_BLOCKS">FE_READ_UNCORRECTED_BLOCKS</link> 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> + +&return-value-dvb; +</section> + +<section id="FE_SET_FRONTEND"> +<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 <link linkend="FE_GET_EVENT">FE_GET_EVENT</link> and + FrontendEvent.) If a new <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link> 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 = <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link>, + 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 <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link> 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> + +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><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="FE_GET_FRONTEND"> +<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 = <link linkend="FE_GET_FRONTEND">FE_GET_FRONTEND</link>, + 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 <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link> 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> + +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><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="FE_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 + <link linkend="FE_GET_EVENT">FE_GET_EVENT</link> + 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 <link linkend="FE_GET_EVENT">FE_GET_EVENT</link> 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> + +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><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"> +<para>Overflow in event queue - one or more events were lost.</para> +</entry> +</row></tbody></tgroup></informaltable> +</section> + +<section id="FE_DISHNETWORK_SEND_LEGACY_CMD"> + <title>FE_DISHNETWORK_SEND_LEGACY_CMD</title> +<para>DESCRIPTION</para> +<informaltable><tgroup cols="1"><tbody><row> +<entry align="char"> +<para>WARNING: This is a very obscure legacy command, used only at stv0299 driver. Should not be used on newer drivers.</para> +<para>It provides a non-standard method for selecting Diseqc voltage on the frontend, for Dish Network legacy switches.</para> +<para>As support for this ioctl were added in 2004, this means that such dishes were already legacy in 2004.</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 = + <link linkend="FE_DISHNETWORK_SEND_LEGACY_CMD">FE_DISHNETWORK_SEND_LEGACY_CMD</link>, unsigned long cmd);</para> +</entry> +</row></tbody></tgroup></informaltable> + +<para>PARAMETERS</para> +<informaltable><tgroup cols="2"><tbody><row> +<entry align="char"> + <para>unsigned long cmd</para> +</entry> +<entry align="char"> +<para> +sends the specified raw cmd to the dish via DISEqC. +</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +</section> |