openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[media] DocBook: reformat FE_GET_INFO ioctl documentation 

The DVB part of the docbook has a completely different format
than the V4L2 part, as it was written as a separate document.

As the V4L2 documentation is on better shape, and its format
allows adding more information, let's use it for FE_GET_INFO
and gradually update the non-legacy DVB ioctls using the new
format.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-05-25 22:56:03 -03:00
parent 97f411d917
commit bb38c5474e
1 changed files with 268 additions and 108 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

376
Documentation/DocBook/media/dvb/frontend.xml
View File

@ -29,71 +29,280 @@
specification is available at
<ulink url="http://www.eutelsat.com/satellites/4_5_5.html">Eutelsat</ulink>.</para>
<section id="fe-caps-t">
<title>frontend capabilities</title>
<para>Capabilities describe what a frontend can do. Some capabilities can only be supported for
a specific frontend type.</para>
<programlisting>
typedef enum fe_caps {
FE_IS_STUPID = 0,
FE_CAN_INVERSION_AUTO = 0x1,
FE_CAN_FEC_1_2 = 0x2,
FE_CAN_FEC_2_3 = 0x4,
FE_CAN_FEC_3_4 = 0x8,
FE_CAN_FEC_4_5 = 0x10,
FE_CAN_FEC_5_6 = 0x20,
FE_CAN_FEC_6_7 = 0x40,
FE_CAN_FEC_7_8 = 0x80,
FE_CAN_FEC_8_9 = 0x100,
FE_CAN_FEC_AUTO = 0x200,
FE_CAN_QPSK = 0x400,
FE_CAN_QAM_16 = 0x800,
FE_CAN_QAM_32 = 0x1000,
FE_CAN_QAM_64 = 0x2000,
FE_CAN_QAM_128 = 0x4000,
FE_CAN_QAM_256 = 0x8000,
FE_CAN_QAM_AUTO = 0x10000,
FE_CAN_TRANSMISSION_MODE_AUTO = 0x20000,
FE_CAN_BANDWIDTH_AUTO = 0x40000,
FE_CAN_GUARD_INTERVAL_AUTO = 0x80000,
FE_CAN_HIERARCHY_AUTO = 0x100000,
FE_CAN_8VSB = 0x200000,
FE_CAN_16VSB = 0x400000,
FE_HAS_EXTENDED_CAPS = 0x800000,
FE_CAN_MULTISTREAM = 0x4000000,
FE_CAN_TURBO_FEC = 0x8000000,
FE_CAN_2G_MODULATION = 0x10000000,
FE_NEEDS_BENDING = 0x20000000,
FE_CAN_RECOVER = 0x40000000,
FE_CAN_MUTE_TS = 0x80000000
} fe_caps_t;
</programlisting>
</section>
<section id="dvb-frontend-info">
<title>frontend information</title>
<section id="query-dvb-frontend-info">
<title>Querying frontend information</title>
<para>Information about the frontend ca be queried with
<link linkend="FE_GET_INFO">FE_GET_INFO</link>.</para>
<programlisting>
struct dvb_frontend_info {
char name[128];
fe_type_t type;
uint32_t frequency_min;
uint32_t frequency_max;
uint32_t frequency_stepsize;
uint32_t frequency_tolerance;
uint32_t symbol_rate_min;
uint32_t symbol_rate_max;
uint32_t symbol_rate_tolerance; /&#x22C6; ppm &#x22C6;/
uint32_t notifier_delay; /&#x22C6; ms &#x22C6;/
fe_caps_t caps;
};
</programlisting>
</section>
<refentry id="FE_GET_INFO">
<refmeta>
<refentrytitle>ioctl FE_GET_INFO</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname>FE_GET_INFO</refname>
<refpurpose>Query DVB frontend capabilities and returns information about
the front-end. This call only requires read-only access to the device</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>int <function>ioctl</function></funcdef>
<paramdef>int <parameter>fd</parameter></paramdef>
<paramdef>int <parameter>request</parameter></paramdef>
<paramdef>struct dvb_frontend_info *<parameter>argp</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term><parameter>fd</parameter></term>
<listitem>
<para>&fd;</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>request</parameter></term>
<listitem>
<para>FE_GET_INFO</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>argp</parameter></term>
<listitem>
<para>pointer to struct &dvb-frontend-info;</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Description</title>
<para>All DVB frontend devices support the
<constant>FE_GET_INFO</constant> ioctl. It is used to identify
kernel devices compatible with this specification and to obtain
information about driver and hardware capabilities. The ioctl takes a
pointer to dvb_frontend_info which is filled by the driver. When the
driver is not compatible with this specification the ioctl returns an error &return-value-dvb;.
</para>
<table pgwide="1" frame="none" id="dvb-frontend-info">
<title>struct <structname>dvb_frontend_info</structname></title>
<tgroup cols="3">
&cs-str;
<tbody valign="top">
<row>
<entry>char *</entry>
<entry>name[128]</entry>
<entry>Name of the frontend</entry>
</row><row>
<entry>fe_type_t</entry>
<entry>type</entry>
<entry>DVBv3 type. Should not be used on modern programs, as a
frontend may have more than one type. So, the DVBv5 API should
be used instead to enumerate and select the frontend type.</entry>
</row><row>
<entry>uint32_t</entry>
<entry>frequency_min</entry>
<entry>Minimal frequency supported by the frontend</entry>
</row><row>
<entry>uint32_t</entry>
<entry>frequency_max</entry>
<entry>Maximal frequency supported by the frontend</entry>
</row><row>
<entry>uint32_t</entry>
<entry>frequency_stepsize</entry>
<entry>Frequency step - all frequencies are multiple of this value</entry>
</row><row>
<entry>uint32_t</entry>
<entry>frequency_tolerance</entry>
<entry>Tolerance of the frequency</entry>
</row><row>
<entry>uint32_t</entry>
<entry>symbol_rate_min</entry>
<entry>Minimal symbol rate (for Cable/Satellite systems), in bauds</entry>
</row><row>
<entry>uint32_t</entry>
<entry>symbol_rate_max</entry>
<entry>Maximal symbol rate (for Cable/Satellite systems), in bauds</entry>
</row><row>
<entry>uint32_t</entry>
<entry>symbol_rate_tolerance</entry>
<entry>Maximal symbol rate tolerance, in ppm</entry>
</row><row>
<entry>uint32_t</entry>
<entry>notifier_delay</entry>
<entry>Deprecated. Not used by any driver.</entry>
</row><row>
<entry>&fe-caps;</entry>
<entry>caps</entry>
<entry>Capabilities supported by the frontend</entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<para>NOTE: The frequencies are specified in Hz for Terrestrial and Cable
systems. They're specified in kHz for Satellite systems</para>
<section id="fe-caps-t">
<title>frontend capabilities</title>
<para>Capabilities describe what a frontend can do. Some capabilities are
supported only on some specific frontend types.</para>
<table pgwide="1" frame="none" id="fe-caps">
<title>enum fe_caps</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry><constant>FE_IS_STUPID</constant></entry>
<entry>There's something wrong at the frontend, and it can't
report its capabilities</entry>
</row>
<row>
<entry><constant>FE_CAN_INVERSION_AUTO</constant></entry>
<entry>The frontend is capable of auto-detecting inversion</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_1_2</constant></entry>
<entry>The frontend supports FEC 1/2</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_2_3</constant></entry>
<entry>The frontend supports FEC 2/3</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_3_4</constant></entry>
<entry>The frontend supports FEC 3/4</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_4_5</constant></entry>
<entry>The frontend supports FEC 4/5</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_5_6</constant></entry>
<entry>The frontend supports FEC 5/6</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_6_7</constant></entry>
<entry>The frontend supports FEC 6/7</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_7_8</constant></entry>
<entry>The frontend supports FEC 7/8</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_8_9</constant></entry>
<entry>The frontend supports FEC 8/9</entry>
</row>
<row>
<entry><constant>FE_CAN_FEC_AUTO</constant></entry>
<entry>The frontend can autodetect FEC.</entry>
</row>
<row>
<entry><constant>FE_CAN_QPSK</constant></entry>
<entry>The frontend supports QPSK modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_QAM_16</constant></entry>
<entry>The frontend supports 16-QAM modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_QAM_32</constant></entry>
<entry>The frontend supports 32-QAM modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_QAM_64</constant></entry>
<entry>The frontend supports 64-QAM modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_QAM_128</constant></entry>
<entry>The frontend supports 128-QAM modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_QAM_256</constant></entry>
<entry>The frontend supports 256-QAM modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_QAM_AUTO</constant></entry>
<entry>The frontend can autodetect modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_TRANSMISSION_MODE_AUTO</constant></entry>
<entry>The frontend can autodetect the transmission mode</entry>
</row>
<row>
<entry><constant>FE_CAN_BANDWIDTH_AUTO</constant></entry>
<entry>The frontend can autodetect the bandwidth</entry>
</row>
<row>
<entry><constant>FE_CAN_GUARD_INTERVAL_AUTO</constant></entry>
<entry>The frontend can autodetect the guard interval</entry>
</row>
<row>
<entry><constant>FE_CAN_HIERARCHY_AUTO</constant></entry>
<entry>The frontend can autodetect hierarch</entry>
</row>
<row>
<entry><constant>FE_CAN_8VSB</constant></entry>
<entry>The frontend supports 8-VSB modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_16VSB</constant></entry>
<entry>The frontend supports 16-VSB modulation</entry>
</row>
<row>
<entry><constant>FE_HAS_EXTENDED_CAPS</constant></entry>
<entry>Currently, unused</entry>
</row>
<row>
<entry><constant>FE_CAN_MULTISTREAM</constant></entry>
<entry>The frontend supports multistream filtering</entry>
</row>
<row>
<entry><constant>FE_CAN_TURBO_FEC</constant></entry>
<entry>The frontend supports turbo FEC modulation</entry>
</row>
<row>
<entry><constant>FE_CAN_2G_MODULATION</constant></entry>
<entry>The frontend supports "2nd generation modulation" (DVB-S2/T2)></entry>
</row>
<row>
<entry><constant>FE_NEEDS_BENDING</constant></entry>
<entry>Not supported anymore, don't use it</entry>
</row>
<row>
<entry><constant>FE_CAN_RECOVER</constant></entry>
<entry>The frontend can recover from a cable unplug automatically</entry>
</row>
<row>
<entry><constant>FE_CAN_MUTE_TS</constant></entry>
<entry>The frontend can stop spurious TS data output</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</refentry>
<section id="dvb-diseqc-master-cmd">
<title>diseqc master command</title>
@ -555,55 +764,6 @@ typedef enum fe_hierarchy {
</row></tbody></tgroup></informaltable>
</section>
<section id="FE_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 = <link linkend="FE_GET_INFO">FE_GET_INFO</link>, struct
dvb_frontend_info &#x22C6;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 <link linkend="FE_GET_INFO">FE_GET_INFO</link> 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>
&return-value-dvb;
</section>
<section id="FE_DISEQC_RESET_OVERLOAD">
<title>FE_DISEQC_RESET_OVERLOAD</title>