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[media] DocBook: some fixes for DVB FE open() 

The changeset dc9ef7d112 change the open() ioctl documentation to
match the V4L2 open(). However, some cut-and-pasted stuff doesn't
match what actually happens at the DVB core.

So, fix the documentation entry to be more accurate with the DVB
frontend open() specifics.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
hifive-unleashed-5.1
Mauro Carvalho Chehab 2015-06-01 05:54:20 -03:00
parent dc9ef7d112
commit 6fd877748a
1 changed files with 16 additions and 12 deletions
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28
Documentation/DocBook/media/dvb/frontend.xml
View File

@ -61,7 +61,7 @@ specification is available at
<refentry id="frontend_f_open">
<refmeta>
<refentrytitle>open()</refentrytitle>
<refentrytitle>DVB frontend open()</refentrytitle>
&manvol;
</refmeta>
@ -94,20 +94,19 @@ specification is available at
<varlistentry>
<term><parameter>flags</parameter></term>
<listitem>
<para>Open flags. Access mode must be
<constant>O_RDWR</constant>. This is just a technicality, input devices
still support only reading and output devices only writing.</para>
<para>When the <constant>O_NONBLOCK</constant> flag is
given, the read() function will return the &EAGAIN; when no data is available,
otherwise these functions block until data becomes
available. Other flags have no effect.</para>
<para>Open flags. Access can either be
<constant>O_RDWR</constant> or <constant>O_RDONLY</constant>.</para>
<para>Multiple opens are allowed with <constant>O_RDONLY</constant>. In this mode, only query and read ioctls are allowed.</para>
<para>Only one open is allowed in <constant>O_RDWR</constant>. In this mode, all ioctls are allowed.</para>
<para>When the <constant>O_NONBLOCK</constant> flag is given, the system calls may return &EAGAIN; when no data is available or when the device driver is temporarily busy.</para>
<para>Other flags have no effect.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Description</title>
<para>This system call opens a named frontend device (/dev/dvb/adapter0/frontend0)
<para>This system call opens a named frontend device (<constant>/dev/dvb/adapter?/frontend?</constant>)
for subsequent use. Usually the first thing to do after a successful open is to
find out the frontend type with <link linkend="FE_GET_INFO">FE_GET_INFO</link>.</para>
<para>The device can be opened in read-only mode, which only allows monitoring of
@ -145,8 +144,7 @@ device.</para>
<varlistentry>
<term><errorcode>EBUSY</errorcode></term>
<listitem>
<para>The driver does not support multiple opens and the
device is already in use.</para>
<para>The the device driver is already in use.</para>
</listitem>
</varlistentry>
<varlistentry>
@ -177,13 +175,19 @@ files open.</para>
system has been reached.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><errorcode>ENODEV</errorcode></term>
<listitem>
<para>The device got removed.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
<refentry id="frontend_f_close">
<refmeta>
<refentrytitle>close()</refentrytitle>
<refentrytitle>DVB frontend close()</refentrytitle>
&manvol;
</refmeta>