[media] media: Media device information query
Create the following ioctl and implement it at the media device level to query device information. - MEDIA_IOC_DEVICE_INFO: Query media device information The ioctl and its data structure are defined in the new kernel header linux/media.h available to userspace applications. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart
Mauro Carvalho Chehab
parent
503c3d829e
commit
140d88165c
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@ -11,6 +11,10 @@
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<!ENTITY func-select "<link linkend='func-select'><function>select()</function></link>">
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<!ENTITY func-write "<link linkend='func-write'><function>write()</function></link>">
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<!ENTITY media-func-close "<link linkend='media-func-close'><function>close()</function></link>">
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<!ENTITY media-func-ioctl "<link linkend='media-func-ioctl'><function>ioctl()</function></link>">
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<!ENTITY media-func-open "<link linkend='media-func-open'><function>open()</function></link>">
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<!-- Ioctls -->
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<!ENTITY VIDIOC-CROPCAP "<link linkend='vidioc-cropcap'><constant>VIDIOC_CROPCAP</constant></link>">
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<!ENTITY VIDIOC-DBG-G-CHIP-IDENT "<link linkend='vidioc-dbg-g-chip-ident'><constant>VIDIOC_DBG_G_CHIP_IDENT</constant></link>">
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@ -87,6 +91,8 @@
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<!ENTITY VIDIOC-TRY-FMT "<link linkend='vidioc-g-fmt'><constant>VIDIOC_TRY_FMT</constant></link>">
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<!ENTITY VIDIOC-UNSUBSCRIBE-EVENT "<link linkend='vidioc-subscribe-event'><constant>VIDIOC_UNSUBSCRIBE_EVENT</constant></link>">
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<!ENTITY MEDIA-IOC-DEVICE-INFO "<link linkend='media-ioc-device-info'><constant>MEDIA_IOC_DEVICE_INFO</constant></link>">
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<!-- Types -->
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<!ENTITY v4l2-std-id "<link linkend='v4l2-std-id'>v4l2_std_id</link>">
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@ -184,6 +190,8 @@
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<!ENTITY v4l2-vbi-format "struct <link linkend='v4l2-vbi-format'>v4l2_vbi_format</link>">
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<!ENTITY v4l2-window "struct <link linkend='v4l2-window'>v4l2_window</link>">
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<!ENTITY media-device-info "struct <link linkend='media-device-info'>media_device_info</link>">
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<!-- Error Codes -->
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<!ENTITY EACCES "<errorcode>EACCES</errorcode> error code">
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<!ENTITY EAGAIN "<errorcode>EAGAIN</errorcode> error code">
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@ -328,6 +336,10 @@
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<!ENTITY sub-media-indices SYSTEM "media-indices.tmpl">
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<!ENTITY sub-media-controller SYSTEM "v4l/media-controller.xml">
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<!ENTITY sub-media-open SYSTEM "v4l/media-func-open.xml">
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<!ENTITY sub-media-close SYSTEM "v4l/media-func-close.xml">
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<!ENTITY sub-media-ioctl SYSTEM "v4l/media-func-ioctl.xml">
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<!ENTITY sub-media-ioc-device-info SYSTEM "v4l/media-ioc-device-info.xml">
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<!-- Function Reference -->
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<!ENTITY close SYSTEM "v4l/func-close.xml">
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@ -74,3 +74,13 @@
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pad to a sink pad.</para>
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</section>
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</chapter>
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<appendix id="media-user-func">
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<title>Function Reference</title>
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<!-- Keep this alphabetically sorted. -->
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&sub-media-open;
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&sub-media-close;
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&sub-media-ioctl;
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<!-- All ioctls go here. -->
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&sub-media-ioc-device-info;
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</appendix>
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@ -0,0 +1,59 @@
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<refentry id="media-func-close">
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<refmeta>
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<refentrytitle>media close()</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>media-close</refname>
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<refpurpose>Close a media device</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <unistd.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>close</function></funcdef>
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<paramdef>int <parameter>fd</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>&fd;</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>Closes the media device. Resources associated with the file descriptor
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are freed. The device configuration remain unchanged.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para><function>close</function> returns 0 on success. On error, -1 is
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returned, and <varname>errno</varname> is set appropriately. Possible error
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codes are:</para>
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<variablelist>
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<varlistentry>
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<term><errorcode>EBADF</errorcode></term>
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<listitem>
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<para><parameter>fd</parameter> is not a valid open file descriptor.
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</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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</refentry>
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@ -0,0 +1,116 @@
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<refentry id="media-func-ioctl">
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<refmeta>
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<refentrytitle>media ioctl()</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>media-ioctl</refname>
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<refpurpose>Control a media device</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <sys/ioctl.h></funcsynopsisinfo>
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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>void *<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>&fd;</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 ioctl request code as defined in the media.h header file,
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for example MEDIA_IOC_SETUP_LINK.</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>Pointer to a request-specific structure.</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>The <function>ioctl()</function> function manipulates media device
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parameters. The argument <parameter>fd</parameter> must be an open file
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descriptor.</para>
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<para>The ioctl <parameter>request</parameter> code specifies the media
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function to be called. It has encoded in it whether the argument is an
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input, output or read/write parameter, and the size of the argument
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<parameter>argp</parameter> in bytes.</para>
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<para>Macros and structures definitions specifying media ioctl requests and
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their parameters are located in the media.h header file. All media ioctl
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requests, their respective function and parameters are specified in
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<xref linkend="media-user-func" />.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para><function>ioctl()</function> returns <returnvalue>0</returnvalue> on
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success. On failure, <returnvalue>-1</returnvalue> is returned, and the
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<varname>errno</varname> variable is set appropriately. Generic error codes
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are listed below, and request-specific error codes are listed in the
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individual requests descriptions.</para>
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<para>When an ioctl that takes an output or read/write parameter fails,
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the parameter remains unmodified.</para>
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<variablelist>
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<varlistentry>
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<term><errorcode>EBADF</errorcode></term>
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<listitem>
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<para><parameter>fd</parameter> is not a valid open file descriptor.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>EFAULT</errorcode></term>
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<listitem>
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<para><parameter>argp</parameter> references an inaccessible memory
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area.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>EINVAL</errorcode></term>
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<listitem>
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<para>The <parameter>request</parameter> or the data pointed to by
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<parameter>argp</parameter> is not valid. This is a very common error
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code, see the individual ioctl requests listed in
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<xref linkend="media-user-func" /> for actual causes.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>ENOMEM</errorcode></term>
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<listitem>
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<para>Insufficient kernel memory was available to complete the
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request.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>ENOTTY</errorcode></term>
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<listitem>
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<para><parameter>fd</parameter> is not associated with a character
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special device.</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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</refentry>
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@ -0,0 +1,94 @@
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<refentry id="media-func-open">
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<refmeta>
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<refentrytitle>media open()</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>media-open</refname>
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<refpurpose>Open a media device</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <fcntl.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>open</function></funcdef>
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<paramdef>const char *<parameter>device_name</parameter></paramdef>
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<paramdef>int <parameter>flags</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>device_name</parameter></term>
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<listitem>
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<para>Device to be opened.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>flags</parameter></term>
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<listitem>
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<para>Open flags. Access mode must be either <constant>O_RDONLY</constant>
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or <constant>O_RDWR</constant>. Other flags have no effect.</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>To open a media device applications call <function>open()</function>
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with the desired device name. The function has no side effects; the device
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configuration remain unchanged.</para>
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<para>When the device is opened in read-only mode, attemps to modify its
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configuration will result in an error, and <varname>errno</varname> will be
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set to <errorcode>EBADF</errorcode>.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para><function>open</function> returns the new file descriptor on success.
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On error, -1 is returned, and <varname>errno</varname> is set appropriately.
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Possible error codes are:</para>
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<variablelist>
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<varlistentry>
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<term><errorcode>EACCES</errorcode></term>
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<listitem>
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<para>The requested access to the file is not allowed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>EMFILE</errorcode></term>
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<listitem>
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<para>The process already has the maximum number of files open.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>ENFILE</errorcode></term>
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<listitem>
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<para>The system limit on the total number of open files has been
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reached.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>ENOMEM</errorcode></term>
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<listitem>
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<para>Insufficient kernel memory was available.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>ENXIO</errorcode></term>
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<listitem>
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<para>No device corresponding to this device special file exists.
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</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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</refentry>
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@ -0,0 +1,132 @@
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<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>&fd;</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>
|
||||
<entry><structfield>hw_revision</structfield></entry>
|
||||
<entry>Hardware device revision in a driver-specific format.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>__u32</entry>
|
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<entry><structfield>media_version</structfield></entry>
|
||||
<entry>Media device driver version, formatted with the
|
||||
<constant>KERNEL_VERSION()</constant> macro. Together with the
|
||||
<structfield>driver</structfield> field this identifies a particular
|
||||
driver.</entry>
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||||
</row>
|
||||
<row>
|
||||
<entry>__u32</entry>
|
||||
<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>
|
||||
<para>The <structfield>serial</structfield> and <structfield>bus_info</structfield>
|
||||
fields can be used to distinguish between multiple instances of otherwise
|
||||
identical hardware. The serial number takes precedence when provided and can
|
||||
be assumed to be unique. If the serial number is an empty string, the
|
||||
<structfield>bus_info</structfield> field can be used instead. The
|
||||
<structfield>bus_info</structfield> field is guaranteed to be unique, but
|
||||
can vary across reboots or device unplug/replug.</para>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Return value</title>
|
||||
<para>This function doesn't return specific error codes.</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
|
@ -22,13 +22,70 @@
|
|||
|
||||
#include <linux/types.h>
|
||||
#include <linux/ioctl.h>
|
||||
#include <linux/media.h>
|
||||
|
||||
#include <media/media-device.h>
|
||||
#include <media/media-devnode.h>
|
||||
#include <media/media-entity.h>
|
||||
|
||||
/* -----------------------------------------------------------------------------
|
||||
* Userspace API
|
||||
*/
|
||||
|
||||
static int media_device_open(struct file *filp)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int media_device_close(struct file *filp)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int media_device_get_info(struct media_device *dev,
|
||||
struct media_device_info __user *__info)
|
||||
{
|
||||
struct media_device_info info;
|
||||
|
||||
memset(&info, 0, sizeof(info));
|
||||
|
||||
strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
|
||||
strlcpy(info.model, dev->model, sizeof(info.model));
|
||||
strlcpy(info.serial, dev->serial, sizeof(info.serial));
|
||||
strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
|
||||
|
||||
info.media_version = MEDIA_API_VERSION;
|
||||
info.hw_revision = dev->hw_revision;
|
||||
info.driver_version = dev->driver_version;
|
||||
|
||||
return copy_to_user(__info, &info, sizeof(*__info));
|
||||
}
|
||||
|
||||
static long media_device_ioctl(struct file *filp, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
struct media_devnode *devnode = media_devnode_data(filp);
|
||||
struct media_device *dev = to_media_device(devnode);
|
||||
long ret;
|
||||
|
||||
switch (cmd) {
|
||||
case MEDIA_IOC_DEVICE_INFO:
|
||||
ret = media_device_get_info(dev,
|
||||
(struct media_device_info __user *)arg);
|
||||
break;
|
||||
|
||||
default:
|
||||
ret = -ENOIOCTLCMD;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct media_file_operations media_device_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = media_device_open,
|
||||
.ioctl = media_device_ioctl,
|
||||
.release = media_device_close,
|
||||
};
|
||||
|
||||
/* -----------------------------------------------------------------------------
|
||||
|
|
|
|||
|
|
@ -233,6 +233,7 @@ header-y += magic.h
|
|||
header-y += major.h
|
||||
header-y += map_to_7segment.h
|
||||
header-y += matroxfb.h
|
||||
header-y += media.h
|
||||
header-y += mempolicy.h
|
||||
header-y += meye.h
|
||||
header-y += mii.h
|
||||
|
|
|
|||
|
|
@ -0,0 +1,45 @@
|
|||
/*
|
||||
* Multimedia device API
|
||||
*
|
||||
* Copyright (C) 2010 Nokia Corporation
|
||||
*
|
||||
* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
||||
* Sakari Ailus <sakari.ailus@iki.fi>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_MEDIA_H
|
||||
#define __LINUX_MEDIA_H
|
||||
|
||||
#include <linux/ioctl.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/version.h>
|
||||
|
||||
#define MEDIA_API_VERSION KERNEL_VERSION(0, 1, 0)
|
||||
|
||||
struct media_device_info {
|
||||
char driver[16];
|
||||
char model[32];
|
||||
char serial[40];
|
||||
char bus_info[32];
|
||||
__u32 media_version;
|
||||
__u32 hw_revision;
|
||||
__u32 driver_version;
|
||||
__u32 reserved[31];
|
||||
};
|
||||
|
||||
#define MEDIA_IOC_DEVICE_INFO _IOWR('M', 1, struct media_device_info)
|
||||
|
||||
#endif /* __LINUX_MEDIA_H */
|
||||
Reference in New Issue