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-<refentry id="vidioc-dbg-g-chip-ident">
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- <refmeta>
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- <refentrytitle>ioctl VIDIOC_DBG_G_CHIP_IDENT</refentrytitle>
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- &manvol;
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- </refmeta>
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-
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- <refnamediv>
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- <refname>VIDIOC_DBG_G_CHIP_IDENT</refname>
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- <refpurpose>Identify the chips on a TV card</refpurpose>
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- </refnamediv>
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-
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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 v4l2_dbg_chip_ident
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-*<parameter>argp</parameter></paramdef>
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- </funcprototype>
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- </funcsynopsis>
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- </refsynopsisdiv>
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-
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- <refsect1>
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- <title>Arguments</title>
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-
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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>VIDIOC_DBG_G_CHIP_IDENT</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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-
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- <refsect1>
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- <title>Description</title>
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-
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- <note>
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- <title>Experimental</title>
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-
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- <para>This is an <link
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-linkend="experimental">experimental</link> interface and may change in
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-the future.</para>
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- </note>
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-
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- <para>For driver debugging purposes this ioctl allows test
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-applications to query the driver about the chips present on the TV
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-card. Regular applications must not use it. When you found a chip
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-specific bug, please contact the linux-media mailing list (&v4l-ml;)
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-so it can be fixed.</para>
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-
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- <para>To query the driver applications must initialize the
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-<structfield>match.type</structfield> and
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-<structfield>match.addr</structfield> or <structfield>match.name</structfield>
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-fields of a &v4l2-dbg-chip-ident;
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-and call <constant>VIDIOC_DBG_G_CHIP_IDENT</constant> with a pointer to
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-this structure. On success the driver stores information about the
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-selected chip in the <structfield>ident</structfield> and
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-<structfield>revision</structfield> fields. On failure the structure
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-remains unchanged.</para>
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-
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- <para>When <structfield>match.type</structfield> is
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-<constant>V4L2_CHIP_MATCH_HOST</constant>,
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-<structfield>match.addr</structfield> selects the nth non-&i2c; chip
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-on the TV card. You can enumerate all chips by starting at zero and
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-incrementing <structfield>match.addr</structfield> by one until
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-<constant>VIDIOC_DBG_G_CHIP_IDENT</constant> fails with an &EINVAL;.
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-The number zero always selects the host chip, ⪚ the chip connected
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-to the PCI or USB bus.</para>
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-
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- <para>When <structfield>match.type</structfield> is
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-<constant>V4L2_CHIP_MATCH_I2C_DRIVER</constant>,
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-<structfield>match.name</structfield> contains the I2C driver name.
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-For instance
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-<constant>"saa7127"</constant> will match any chip
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-supported by the saa7127 driver, regardless of its &i2c; bus address.
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-When multiple chips supported by the same driver are present, the
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-ioctl will return <constant>V4L2_IDENT_AMBIGUOUS</constant> in the
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-<structfield>ident</structfield> field.</para>
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-
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- <para>When <structfield>match.type</structfield> is
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-<constant>V4L2_CHIP_MATCH_I2C_ADDR</constant>,
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-<structfield>match.addr</structfield> selects a chip by its 7 bit
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-&i2c; bus address.</para>
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-
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- <para>When <structfield>match.type</structfield> is
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-<constant>V4L2_CHIP_MATCH_AC97</constant>,
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-<structfield>match.addr</structfield> selects the nth AC97 chip
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-on the TV card. You can enumerate all chips by starting at zero and
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-incrementing <structfield>match.addr</structfield> by one until
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-<constant>VIDIOC_DBG_G_CHIP_IDENT</constant> fails with an &EINVAL;.</para>
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-
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- <para>On success, the <structfield>ident</structfield> field will
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-contain a chip ID from the Linux
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-<filename>media/v4l2-chip-ident.h</filename> header file, and the
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-<structfield>revision</structfield> field will contain a driver
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-specific value, or zero if no particular revision is associated with
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-this chip.</para>
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-
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- <para>When the driver could not identify the selected chip,
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-<structfield>ident</structfield> will contain
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-<constant>V4L2_IDENT_UNKNOWN</constant>. When no chip matched
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-the ioctl will succeed but the
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-<structfield>ident</structfield> field will contain
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-<constant>V4L2_IDENT_NONE</constant>. If multiple chips matched,
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-<structfield>ident</structfield> will contain
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-<constant>V4L2_IDENT_AMBIGUOUS</constant>. In all these cases the
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-<structfield>revision</structfield> field remains unchanged.</para>
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-
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- <para>This ioctl is optional, not all drivers may support it. It
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-was introduced in Linux 2.6.21, but the API was changed to the
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-one described here in 2.6.29.</para>
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-
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- <para>We recommended the <application>v4l2-dbg</application>
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-utility over calling this ioctl directly. It is available from the
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-LinuxTV v4l-dvb repository; see <ulink
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-url="http://linuxtv.org/repo/">http://linuxtv.org/repo/</ulink> for
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-access instructions.</para>
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-
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- <!-- Note for convenience vidioc-dbg-g-register.sgml
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- contains a duplicate of this table. -->
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- <table pgwide="1" frame="none" id="ident-v4l2-dbg-match">
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- <title>struct <structname>v4l2_dbg_match</structname></title>
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- <tgroup cols="4">
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- &cs-ustr;
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- <tbody valign="top">
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- <row>
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- <entry>__u32</entry>
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- <entry><structfield>type</structfield></entry>
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- <entry>See <xref linkend="ident-chip-match-types" /> for a list of
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-possible types.</entry>
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- </row>
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- <row>
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- <entry>union</entry>
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- <entry>(anonymous)</entry>
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- </row>
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- <row>
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- <entry></entry>
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- <entry>__u32</entry>
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- <entry><structfield>addr</structfield></entry>
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- <entry>Match a chip by this number, interpreted according
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-to the <structfield>type</structfield> field.</entry>
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- </row>
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- <row>
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- <entry></entry>
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- <entry>char</entry>
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- <entry><structfield>name[32]</structfield></entry>
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- <entry>Match a chip by this name, interpreted according
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-to the <structfield>type</structfield> field.</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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-
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- <table pgwide="1" frame="none" id="v4l2-dbg-chip-ident">
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- <title>struct <structname>v4l2_dbg_chip_ident</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>struct v4l2_dbg_match</entry>
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- <entry><structfield>match</structfield></entry>
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- <entry>How to match the chip, see <xref linkend="ident-v4l2-dbg-match" />.</entry>
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- </row>
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- <row>
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- <entry>__u32</entry>
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- <entry><structfield>ident</structfield></entry>
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- <entry>A chip identifier as defined in the Linux
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-<filename>media/v4l2-chip-ident.h</filename> header file, or one of
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-the values from <xref linkend="chip-ids" />.</entry>
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- </row>
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- <row>
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- <entry>__u32</entry>
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- <entry><structfield>revision</structfield></entry>
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- <entry>A chip revision, chip and driver specific.</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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-
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- <!-- Note for convenience vidioc-dbg-g-register.sgml
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- contains a duplicate of this table. -->
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- <table pgwide="1" frame="none" id="ident-chip-match-types">
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- <title>Chip Match Types</title>
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- <tgroup cols="3">
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- &cs-def;
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- <tbody valign="top">
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- <row>
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- <entry><constant>V4L2_CHIP_MATCH_BRIDGE</constant></entry>
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- <entry>0</entry>
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- <entry>Match the nth chip on the card, zero for the
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- bridge chip. Does not match sub-devices.</entry>
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- </row>
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- <row>
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- <entry><constant>V4L2_CHIP_MATCH_I2C_DRIVER</constant></entry>
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- <entry>1</entry>
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- <entry>Match an &i2c; chip by its driver name.</entry>
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- </row>
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- <row>
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- <entry><constant>V4L2_CHIP_MATCH_I2C_ADDR</constant></entry>
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- <entry>2</entry>
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- <entry>Match a chip by its 7 bit &i2c; bus address.</entry>
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- </row>
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- <row>
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- <entry><constant>V4L2_CHIP_MATCH_AC97</constant></entry>
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- <entry>3</entry>
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- <entry>Match the nth anciliary AC97 chip.</entry>
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- </row>
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- <row>
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- <entry><constant>V4L2_CHIP_MATCH_SUBDEV</constant></entry>
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- <entry>4</entry>
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- <entry>Match the nth sub-device. Can't be used with this ioctl.</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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-
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- <!-- This is an anonymous enum in media/v4l2-chip-ident.h. -->
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- <table pgwide="1" frame="none" id="chip-ids">
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- <title>Chip Identifiers</title>
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- <tgroup cols="3">
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- &cs-def;
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- <tbody valign="top">
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- <row>
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- <entry><constant>V4L2_IDENT_NONE</constant></entry>
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- <entry>0</entry>
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- <entry>No chip matched.</entry>
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- </row>
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- <row>
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- <entry><constant>V4L2_IDENT_AMBIGUOUS</constant></entry>
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- <entry>1</entry>
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- <entry>Multiple chips matched.</entry>
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- </row>
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- <row>
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- <entry><constant>V4L2_IDENT_UNKNOWN</constant></entry>
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- <entry>2</entry>
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- <entry>A chip is present at this address, but the driver
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-could not identify it.</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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- </refsect1>
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-
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- <refsect1>
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- &return-value;
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-
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- <variablelist>
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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 <structfield>match_type</structfield> is invalid.</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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Hans Verkuil