forked from Minki/linux
dfcf4f9d97
Instead of having their own generic error codes at the MC API, move its section to the generic one and be sure that all media ioctl's will point to it. Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
133 lines
4.5 KiB
XML
133 lines
4.5 KiB
XML
<refentry id="media-ioc-device-info">
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<refmeta>
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<refentrytitle>ioctl MEDIA_IOC_DEVICE_INFO</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>MEDIA_IOC_DEVICE_INFO</refname>
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<refpurpose>Query device information</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>struct media_device_info *<parameter>argp</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Arguments</title>
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<variablelist>
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<varlistentry>
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<term><parameter>fd</parameter></term>
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<listitem>
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<para>File descriptor returned by
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<link linkend='media-func-open'><function>open()</function></link>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>request</parameter></term>
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<listitem>
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<para>MEDIA_IOC_DEVICE_INFO</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>argp</parameter></term>
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<listitem>
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<para></para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>All media devices must support the <constant>MEDIA_IOC_DEVICE_INFO</constant>
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ioctl. To query device information, applications call the ioctl with a
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pointer to a &media-device-info;. The driver fills the structure and returns
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the information to the application.
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The ioctl never fails.</para>
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<table pgwide="1" frame="none" id="media-device-info">
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<title>struct <structname>media_device_info</structname></title>
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<tgroup cols="3">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>char</entry>
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<entry><structfield>driver</structfield>[16]</entry>
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<entry><para>Name of the driver implementing the media API as a
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NUL-terminated ASCII string. The driver version is stored in the
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<structfield>driver_version</structfield> field.</para>
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<para>Driver specific applications can use this information to
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verify the driver identity. It is also useful to work around
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known bugs, or to identify drivers in error reports.</para></entry>
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</row>
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<row>
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<entry>char</entry>
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<entry><structfield>model</structfield>[32]</entry>
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<entry>Device model name as a NUL-terminated UTF-8 string. The
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device version is stored in the <structfield>device_version</structfield>
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field and is not be appended to the model name.</entry>
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</row>
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<row>
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<entry>char</entry>
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<entry><structfield>serial</structfield>[40]</entry>
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<entry>Serial number as a NUL-terminated ASCII string.</entry>
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</row>
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<row>
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<entry>char</entry>
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<entry><structfield>bus_info</structfield>[32]</entry>
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<entry>Location of the device in the system as a NUL-terminated
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ASCII string. This includes the bus type name (PCI, USB, ...) and a
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bus-specific identifier.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>media_version</structfield></entry>
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<entry>Media API version, formatted with the
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<constant>KERNEL_VERSION()</constant> macro.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>hw_revision</structfield></entry>
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<entry>Hardware device revision in a driver-specific format.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>media_version</structfield></entry>
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<entry>Media device driver version, formatted with the
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<constant>KERNEL_VERSION()</constant> macro. Together with the
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<structfield>driver</structfield> field this identifies a particular
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driver.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>reserved</structfield>[31]</entry>
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<entry>Reserved for future extensions. Drivers and applications must
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set this array to zero.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>The <structfield>serial</structfield> and <structfield>bus_info</structfield>
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fields can be used to distinguish between multiple instances of otherwise
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identical hardware. The serial number takes precedence when provided and can
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be assumed to be unique. If the serial number is an empty string, the
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<structfield>bus_info</structfield> field can be used instead. The
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<structfield>bus_info</structfield> field is guaranteed to be unique, but
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can vary across reboots or device unplug/replug.</para>
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</refsect1>
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<refsect1>
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&return-value;
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</refsect1>
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</refentry>
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