On Sunday, September 26, 2010 18:13:31 Laurent Pinchart wrote:
> The three new ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL,
> VIDIOC_SUBDEV_G_FRAME_INTERVAL and VIDIOC_SUBDEV_S_FRAME_INTERVAL can be
> used to enumerate and configure a subdev's frame rate from userspace.
>
> Two new video::g/s_frame_interval subdev operations are introduced to
> support those ioctls. The existing video::g/s_parm operations are
> deprecated and shouldn't be used anymore.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxxxxxxxxxxxxx>
> ---
> Documentation/DocBook/media-entities.tmpl | 6 +
> Documentation/DocBook/v4l/v4l2.xml | 2 +
> .../v4l/vidioc-subdev-enum-frame-interval.xml | 147 ++++++++++++++++++++
> .../DocBook/v4l/vidioc-subdev-g-frame-interval.xml | 135 ++++++++++++++++++
> drivers/media/video/v4l2-subdev.c | 16 ++
> include/linux/v4l2-subdev.h | 36 +++++
> include/media/v4l2-subdev.h | 7 +
> 7 files changed, 349 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/DocBook/v4l/vidioc-subdev-enum-frame-interval.xml
> create mode 100644 Documentation/DocBook/v4l/vidioc-subdev-g-frame-interval.xml
>
> diff --git a/Documentation/DocBook/media-entities.tmpl b/Documentation/DocBook/media-entities.tmpl
> index 160bca6..71cdc75 100644
> --- a/Documentation/DocBook/media-entities.tmpl
> +++ b/Documentation/DocBook/media-entities.tmpl
> @@ -89,7 +89,9 @@
> <!ENTITY VIDIOC-SUBDEV-ENUM-FRAME-SIZE "<link linkend='vidioc-subdev-enum-frame-size'><constant>VIDIOC_SUBDEV_ENUM_FRAME_SIZE</constant></link>">
> <!ENTITY VIDIOC-SUBDEV-ENUM-MBUS-CODE "<link linkend='vidioc-subdev-enum-mbus-code'><constant>VIDIOC_SUBDEV_ENUM_MBUS_CODE</constant></link>">
> <!ENTITY VIDIOC-SUBDEV-G-FMT "<link linkend='vidioc-subdev-g-fmt'><constant>VIDIOC_SUBDEV_G_FMT</constant></link>">
> +<!ENTITY VIDIOC-SUBDEV-G-FRAME-INTERVAL "<link linkend='vidioc-subdev-g-frame-interval'><constant>VIDIOC_SUBDEV_G_FRAME_INTERVAL</constant></link>">
> <!ENTITY VIDIOC-SUBDEV-S-FMT "<link linkend='vidioc-subdev-g-fmt'><constant>VIDIOC_SUBDEV_S_FMT</constant></link>">
> +<!ENTITY VIDIOC-SUBDEV-S-FRAME-INTERVAL "<link linkend='vidioc-subdev-g-frame-interval'><constant>VIDIOC_SUBDEV_S_FRAME_INTERVAL</constant></link>">
> <!ENTITY VIDIOC-TRY-ENCODER-CMD "<link linkend='vidioc-encoder-cmd'><constant>VIDIOC_TRY_ENCODER_CMD</constant></link>">
> <!ENTITY VIDIOC-TRY-EXT-CTRLS "<link linkend='vidioc-g-ext-ctrls'><constant>VIDIOC_TRY_EXT_CTRLS</constant></link>">
> <!ENTITY VIDIOC-TRY-FMT "<link linkend='vidioc-g-fmt'><constant>VIDIOC_TRY_FMT</constant></link>">
> @@ -190,6 +192,8 @@
> <!ENTITY v4l2-sliced-vbi-cap "struct <link linkend='v4l2-sliced-vbi-cap'>v4l2_sliced_vbi_cap</link>">
> <!ENTITY v4l2-sliced-vbi-data "struct <link linkend='v4l2-sliced-vbi-data'>v4l2_sliced_vbi_data</link>">
> <!ENTITY v4l2-sliced-vbi-format "struct <link linkend='v4l2-sliced-vbi-format'>v4l2_sliced_vbi_format</link>">
> +<!ENTITY v4l2-subdev-frame-interval "struct <link linkend='v4l2-subdev-frame-interval'>v4l2_subdev_frame_interval</link>">
> +<!ENTITY v4l2-subdev-frame-interval-enum "struct <link linkend='v4l2-subdev-frame-interval-enum'>v4l2_subdev_frame_interval_enum</link>">
> <!ENTITY v4l2-subdev-frame-size-enum "struct <link linkend='v4l2-subdev-frame-size-enum'>v4l2_subdev_frame_size_enum</link>">
> <!ENTITY v4l2-subdev-format "struct <link linkend='v4l2-subdev-format'>v4l2_subdev_format</link>">
> <!ENTITY v4l2-subdev-mbus-code-enum "struct <link linkend='v4l2-subdev-mbus-code-enum'>v4l2_subdev_mbus_code_enum</link>">
> @@ -322,10 +326,12 @@
> <!ENTITY sub-reqbufs SYSTEM "v4l/vidioc-reqbufs.xml">
> <!ENTITY sub-s-hw-freq-seek SYSTEM "v4l/vidioc-s-hw-freq-seek.xml">
> <!ENTITY sub-streamon SYSTEM "v4l/vidioc-streamon.xml">
> +<!ENTITY sub-subdev-enum-frame-interval SYSTEM "v4l/vidioc-subdev-enum-frame-interval.xml">
> <!ENTITY sub-subdev-enum-frame-size SYSTEM "v4l/vidioc-subdev-enum-frame-size.xml">
> <!ENTITY sub-subdev-enum-mbus-code SYSTEM "v4l/vidioc-subdev-enum-mbus-code.xml">
> <!ENTITY sub-subdev-formats SYSTEM "v4l/subdev-formats.xml">
> <!ENTITY sub-subdev-g-fmt SYSTEM "v4l/vidioc-subdev-g-fmt.xml">
> +<!ENTITY sub-subdev-g-frame-interval SYSTEM "v4l/vidioc-subdev-g-frame-interval.xml">
> <!ENTITY sub-capture-c SYSTEM "v4l/capture.c.xml">
> <!ENTITY sub-keytable-c SYSTEM "v4l/keytable.c.xml">
> <!ENTITY sub-v4l2grab-c SYSTEM "v4l/v4l2grab.c.xml">
> diff --git a/Documentation/DocBook/v4l/v4l2.xml b/Documentation/DocBook/v4l/v4l2.xml
> index 3a59b82..7806562 100644
> --- a/Documentation/DocBook/v4l/v4l2.xml
> +++ b/Documentation/DocBook/v4l/v4l2.xml
> @@ -470,9 +470,11 @@ and discussions on the V4L mailing list.</revremark>
> &sub-reqbufs;
> &sub-s-hw-freq-seek;
> &sub-streamon;
> + &sub-subdev-enum-frame-interval;
> &sub-subdev-enum-frame-size;
> &sub-subdev-enum-mbus-code;
> &sub-subdev-g-fmt;
> + &sub-subdev-g-frame-interval;
> &sub-subscribe-event;
> <!-- End of ioctls. -->
> &sub-mmap;
> diff --git a/Documentation/DocBook/v4l/vidioc-subdev-enum-frame-interval.xml b/Documentation/DocBook/v4l/vidioc-subdev-enum-frame-interval.xml
> new file mode 100644
> index 0000000..be73500
> --- /dev/null
> +++ b/Documentation/DocBook/v4l/vidioc-subdev-enum-frame-interval.xml
> @@ -0,0 +1,147 @@
> +<refentry id="vidioc-subdev-enum-frame-interval">
> + <refmeta>
> + <refentrytitle>ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</refentrytitle>
> + &manvol;
> + </refmeta>
> +
> + <refnamediv>
> + <refname>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</refname>
> + <refpurpose>Enumerate frame intervals</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 v4l2_subdev_frame_interval_enum *
> + <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>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</para>
> + </listitem>
> + </varlistentry>
> + <varlistentry>
> + <term><parameter>argp</parameter></term>
> + <listitem>
> + <para></para>
> + </listitem>
> + </varlistentry>
> + </variablelist>
> + </refsect1>
> +
> + <refsect1>
> + <title>Description</title>
> +
> + <para>This ioctl lets applications enumerate available frame intervals on a
> + given sub-device pad. Frame intervals only makes sense for sub-devices that
> + can control the frame period on their own. This includes, for instance,
> + image sensors and TV tuners. Sub-devices that don't support frame intervals
> + must not implement this ioctl.</para>
How do I know as application that frame intervals are not supported? Frankly, this applies
to the normal V4L2 ioctl as well :-)
> + <para>For the common use case of image sensors, the frame intervals
> + available on the sub-device output pad depend on the frame format and size
> + on the same pad. Applications must thus specify the desired format and size
> + when enumerating frame intervals.</para>
> +
> + <para>To enumerate frame intervals applications initialize the
> + <structfield>index</structfield>, <structfield>pad</structfield>,
> + <structfield>code</structfield>, <structfield>width</structfield> and
> + <structfield>height</structfield> fields of
> + &v4l2-subdev-frame-interval-enum; and call the
> + <constant>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</constant> ioctl with a pointer
> + to this structure. Drivers fill the rest of the structure or return
> + an &EINVAL; if one of the input fields is invalid. All frame intervals are
> + enumerable by beginning at index zero and incrementing by one until
> + <errorcode>EINVAL</errorcode> is returned.</para>
> +
> + <para>Available frame intervals may depend on the current probe formats
> + at other pads of the sub-device, as well as on the current active links. See
> + &VIDIOC-SUBDEV-G-FMT; for more information about the probe formats.</para>
> +
> + <para>Sub-devices that support the frame interval enumeration ioctl should
> + implemented it on a single pad only. Its behaviour when supported on
> + multiple pads of the same sub-device is not defined.</para>
> +
> + <table pgwide="1" frame="none" id="v4l2-subdev-frame-interval-enum">
> + <title>struct <structname>v4l2_subdev_frame_interval_enum</structname></title>
> + <tgroup cols="3">
> + &cs-str;
> + <tbody valign="top">
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>index</structfield></entry>
> + <entry>Number of the format in the enumeration, set by the
> + application.</entry>
> + </row>
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>pad</structfield></entry>
> + <entry>Pad number as reported by the media controller API.</entry>
> + </row>
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>code</structfield></entry>
> + <entry>The media bus format code, as defined in
> + <xref linkend="v4l2-mbus-format" />.</entry>
> + </row>
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>width</structfield></entry>
> + <entry>Frame width, in pixels.</entry>
> + </row>
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>height</structfield></entry>
> + <entry>Frame height, in pixels.</entry>
> + </row>
> + <row>
> + <entry>&v4l2-fract;</entry>
> + <entry><structfield>interval</structfield></entry>
> + <entry>Period, in seconds, between consecutive video frames.</entry>
> + </row>
struct v4l2_frmivalenum is not needed for this?
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>reserved</structfield>[9]</entry>
> + <entry>Reserved for future extensions. Applications and drivers must
> + set the array to zero.</entry>
> + </row>
> + </tbody>
> + </tgroup>
> + </table>
> + </refsect1>
> +
> + <refsect1>
> + &return-value;
> +
> + <variablelist>
> + <varlistentry>
> + <term><errorcode>EINVAL</errorcode></term>
> + <listitem>
> + <para>The &v4l2-subdev-frame-interval-enum;
> + <structfield>pad</structfield> references a non-existing pad, one of
> + the <structfield>code</structfield>, <structfield>width</structfield>
> + or <structfield>height</structfield> fields are invalid for the given
> + pad or the <structfield>index</structfield> field is out of bounds.
> + </para>
> + </listitem>
> + </varlistentry>
> + </variablelist>
> + </refsect1>
> +</refentry>
> diff --git a/Documentation/DocBook/v4l/vidioc-subdev-g-frame-interval.xml b/Documentation/DocBook/v4l/vidioc-subdev-g-frame-interval.xml
> new file mode 100644
> index 0000000..1d0e0e1
> --- /dev/null
> +++ b/Documentation/DocBook/v4l/vidioc-subdev-g-frame-interval.xml
> @@ -0,0 +1,135 @@
> +<refentry id="vidioc-subdev-g-frame-interval">
> + <refmeta>
> + <refentrytitle>ioctl VIDIOC_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL</refentrytitle>
> + &manvol;
> + </refmeta>
> +
> + <refnamediv>
> + <refname>VIDIOC_SUBDEV_G_FRAME_INTERVAL</refname>
> + <refname>VIDIOC_SUBDEV_S_FRAME_INTERVAL</refname>
> + <refpurpose>Get or set the frame interval on a subdev pad</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 v4l2_subdev_frame_interval *<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>VIDIOC_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL</para>
> + </listitem>
> + </varlistentry>
> + <varlistentry>
> + <term><parameter>argp</parameter></term>
> + <listitem>
> + <para></para>
> + </listitem>
> + </varlistentry>
> + </variablelist>
> + </refsect1>
> +
> + <refsect1>
> + <title>Description</title>
> +
> + <para>These ioctls are used to get and set the frame interval at specific
> + subdev pads in the image pipeline. The frame interval only makes sense for
> + sub-devices that can control the frame period on their own. This includes,
> + for instance, image sensors and TV tuners. Sub-devices that don't support
> + frame intervals must not implement these ioctls.</para>
> +
> + <para>To retrieve the current frame interval applications set the
> + <structfield>pad</structfield> field of a &v4l2-subdev-frame-interval; to
> + the desired pad number as reported by the media controller API. When they
> + call the <constant>VIDIOC_SUBDEV_G_FRAME_INTERVAL</constant> ioctl with a
> + pointer to this structure the driver fills the members of the
> + <structfield>interval</structfield> field.</para>
> +
> + <para>To change the current frame interval applications set both the
> + <structfield>pad</structfield> field and all members of the
> + <structfield>interval</structfield> field. When they call the
> + <constant>VIDIOC_SUBDEV_S_FRAME_INTERVAL</constant> ioctl with a pointer to
> + this structure the driver verifies the requested interval, adjusts it based
> + on the hardware capabilities and configures the device. Upon return the
> + &v4l2-subdev-frame-interval; contains the current frame interval as would be
> + returned by a <constant>VIDIOC_SUBDEV_G_FRAME_INTERVAL</constant> call.
> + </para>
> +
> + <para>Drivers must not return an error solely because the requested interval
> + doesn't match the device capabilities. They must instead modify the interval
> + to match what the hardware can provide. The modified interval should be as
> + close as possible to the original request.</para>
Perhaps this should be driver dependent? What is the rationale for requiring this
behavior?
> + <para>Sub-devices that support the frame interval ioctls should implement
> + them on a single pad only. Their behaviour when supported on multiple pads
> + of the same sub-device is not defined.</para>
> +
> + <table pgwide="1" frame="none" id="v4l2-subdev-frame-interval">
> + <title>struct <structname>v4l2_subdev_frame_interval</structname></title>
> + <tgroup cols="3">
> + &cs-str;
> + <tbody valign="top">
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>pad</structfield></entry>
> + <entry>Pad number as reported by the media controller API.</entry>
> + </row>
> + <row>
> + <entry>&v4l2-fract;</entry>
> + <entry><structfield>interval</structfield></entry>
> + <entry>Period, in seconds, between consecutive video frames.</entry>
> + </row>
> + <row>
> + <entry>__u32</entry>
> + <entry><structfield>reserved</structfield>[5]</entry>
> + <entry>Reserved for future extensions. Applications and drivers must
> + set the array to zero.</entry>
> + </row>
> + </tbody>
> + </tgroup>
> + </table>
> + </refsect1>
> +
> + <refsect1>
> + &return-value;
> +
> + <variablelist>
> + <varlistentry>
> + <term><errorcode>EBUSY</errorcode></term>
> + <listitem>
> + <para>The frame interval can't be changed because the pad is currently
> + busy. This can be caused, for instance, by an active video stream on
> + the pad. The ioctl must not be retried without performing another
> + action to fix the problem first. Only returned by
> + <constant>VIDIOC_SUBDEV_S_FRAME_INTERVAL</constant></para>
> + </listitem>
> + </varlistentry>
> + <varlistentry>
> + <term><errorcode>EINVAL</errorcode></term>
> + <listitem>
> + <para>The &v4l2-subdev-frame-interval; <structfield>pad</structfield>
> + references a non-existing pad, or the pad doesn't support frame
> + intervals.</para>
> + </listitem>
> + </varlistentry>
> + </variablelist>
> + </refsect1>
> +</refentry>
> diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
> index 380d2f2..9895b7c 100644
> --- a/drivers/media/video/v4l2-subdev.c
> +++ b/drivers/media/video/v4l2-subdev.c
> @@ -219,6 +219,22 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> fse);
> }
>
> + case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
> + return v4l2_subdev_call(sd, video, g_frame_interval, arg);
> +
> + case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
> + return v4l2_subdev_call(sd, video, s_frame_interval, arg);
> +
> + case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
> + struct v4l2_subdev_frame_interval_enum *fie = arg;
> +
> + if (fie->pad >= sd->entity.num_pads)
> + return -EINVAL;
> +
> + return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
> + fie);
> + }
> +
> default:
> return -ENOIOCTLCMD;
> }
> diff --git a/include/linux/v4l2-subdev.h b/include/linux/v4l2-subdev.h
> index 623d063..eb9a6a2 100644
> --- a/include/linux/v4l2-subdev.h
> +++ b/include/linux/v4l2-subdev.h
> @@ -80,11 +80,47 @@ struct v4l2_subdev_frame_size_enum {
> __u32 reserved[9];
> };
>
> +/**
> + * struct v4l2_subdev_frame_interval - Pad-level frame rate
> + * @pad: pad number, as reported by the media API
> + * @interval: frame interval in seconds
> + */
> +struct v4l2_subdev_frame_interval {
> + __u32 pad;
> + struct v4l2_fract interval;
> + __u32 reserved[5];
> +};
> +
> +/**
> + * struct v4l2_subdev_frame_interval_enum - Frame interval enumeration
> + * @pad: pad number, as reported by the media API
> + * @index: frame interval index during enumeration
> + * @code: format code (from enum v4l2_mbus_pixelcode)
> + * @width: frame width in pixels
> + * @height: frame height in pixels
> + * @interval: frame interval in seconds
> + */
> +struct v4l2_subdev_frame_interval_enum {
> + __u32 index;
> + __u32 pad;
> + __u32 code;
> + __u32 width;
> + __u32 height;
> + struct v4l2_fract interval;
> + __u32 reserved[9];
> +};
> +
> #define VIDIOC_SUBDEV_G_FMT _IOWR('V', 4, struct v4l2_subdev_format)
> #define VIDIOC_SUBDEV_S_FMT _IOWR('V', 5, struct v4l2_subdev_format)
> +#define VIDIOC_SUBDEV_G_FRAME_INTERVAL \
> + _IOWR('V', 21, struct v4l2_subdev_frame_interval)
> +#define VIDIOC_SUBDEV_S_FRAME_INTERVAL \
> + _IOWR('V', 22, struct v4l2_subdev_frame_interval)
> #define VIDIOC_SUBDEV_ENUM_MBUS_CODE \
> _IOWR('V', 2, struct v4l2_subdev_mbus_code_enum)
> #define VIDIOC_SUBDEV_ENUM_FRAME_SIZE \
> _IOWR('V', 74, struct v4l2_subdev_frame_size_enum)
> +#define VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL \
> + _IOWR('V', 75, struct v4l2_subdev_frame_interval_enum)
>
> #endif
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index bbbe4bf..bb6aaeb 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -276,6 +276,10 @@ struct v4l2_subdev_video_ops {
> int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
> int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
> int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
> + int (*g_frame_interval)(struct v4l2_subdev *sd,
> + struct v4l2_subdev_frame_interval *interval);
> + int (*s_frame_interval)(struct v4l2_subdev *sd,
> + struct v4l2_subdev_frame_interval *interval);
> int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
> int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
> int (*enum_dv_presets) (struct v4l2_subdev *sd,
> @@ -426,6 +430,9 @@ struct v4l2_subdev_pad_ops {
> int (*enum_frame_size)(struct v4l2_subdev *sd,
> struct v4l2_subdev_fh *fh,
> struct v4l2_subdev_frame_size_enum *fse);
> + int (*enum_frame_interval)(struct v4l2_subdev *sd,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_frame_interval_enum *fie);
> int (*get_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
> unsigned int pad, struct v4l2_mbus_framefmt *fmt,
> enum v4l2_subdev_format_whence which);
>
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG, part of Cisco
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