mirror of https://gitee.com/openkylin/linux.git
[media] v4l: Add support for DV timings ioctls on subdev nodes
Validate the pad field in the core code whenever specified. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Laurent Pinchart
Mauro Carvalho Chehab
parent
c4fa146ce5
commit
9cfd65e809
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@ -1,11 +1,12 @@
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<refentry id="vidioc-dv-timings-cap">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP</refentrytitle>
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<refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_DV_TIMINGS_CAP</refname>
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<refname>VIDIOC_SUBDEV_DV_TIMINGS_CAP</refname>
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<refpurpose>The capabilities of the Digital Video receiver/transmitter</refpurpose>
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</refnamediv>
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@ -33,7 +34,7 @@
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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_DV_TIMINGS_CAP</para>
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<para>VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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@ -54,10 +55,19 @@
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interface and may change in the future.</para>
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</note>
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<para>To query the capabilities of the DV receiver/transmitter applications can call
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this ioctl and the driver will fill in the structure. Note that drivers may return
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<para>To query the capabilities of the DV receiver/transmitter applications
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can call the <constant>VIDIOC_DV_TIMINGS_CAP</constant> ioctl on a video node
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and the driver will fill in the structure. Note that drivers may return
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different values after switching the video input or output.</para>
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<para>When implemented by the driver DV capabilities of subdevices can be
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queried by calling the <constant>VIDIOC_SUBDEV_DV_TIMINGS_CAP</constant> ioctl
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directly on a subdevice node. The capabilities are specific to inputs (for DV
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receivers) or outputs (for DV transmitters), applications must specify the
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desired pad number in the &v4l2-dv-timings-cap; <structfield>pad</structfield>
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field. Attempts to query capabilities on a pad that doesn't support them will
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return an &EINVAL;.</para>
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<table pgwide="1" frame="none" id="v4l2-bt-timings-cap">
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<title>struct <structname>v4l2_bt_timings_cap</structname></title>
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<tgroup cols="3">
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@ -127,7 +137,14 @@ different values after switching the video input or output.</para>
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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>[3]</entry>
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<entry><structfield>pad</structfield></entry>
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<entry>Pad number as reported by the media controller API. This field
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is only used when operating on a subdevice node. When operating on a
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video node applications must set this field to zero.</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>[2]</entry>
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<entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
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</row>
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<row>
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@ -1,11 +1,12 @@
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<refentry id="vidioc-enum-dv-timings">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_ENUM_DV_TIMINGS</refentrytitle>
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<refentrytitle>ioctl VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_ENUM_DV_TIMINGS</refname>
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<refname>VIDIOC_SUBDEV_ENUM_DV_TIMINGS</refname>
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<refpurpose>Enumerate supported Digital Video timings</refpurpose>
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</refnamediv>
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@ -33,7 +34,7 @@
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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_ENUM_DV_TIMINGS</para>
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<para>VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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@ -61,14 +62,21 @@ standards or even custom timings that are not in this list.</para>
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<para>To query the available timings, applications initialize the
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<structfield>index</structfield> field and zero the reserved array of &v4l2-enum-dv-timings;
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and call the <constant>VIDIOC_ENUM_DV_TIMINGS</constant> ioctl with a pointer to this
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structure. Drivers fill the rest of the structure or return an
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and call the <constant>VIDIOC_ENUM_DV_TIMINGS</constant> ioctl on a video node with a
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pointer to this structure. Drivers fill the rest of the structure or return an
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&EINVAL; when the index is out of bounds. To enumerate all supported DV timings,
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applications shall begin at index zero, incrementing by one until the
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driver returns <errorcode>EINVAL</errorcode>. Note that drivers may enumerate a
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different set of DV timings after switching the video input or
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output.</para>
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<para>When implemented by the driver DV timings of subdevices can be queried
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by calling the <constant>VIDIOC_SUBDEV_ENUM_DV_TIMINGS</constant> ioctl directly
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on a subdevice node. The DV timings are specific to inputs (for DV receivers) or
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outputs (for DV transmitters), applications must specify the desired pad number
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in the &v4l2-enum-dv-timings; <structfield>pad</structfield> field. Attempts to
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enumerate timings on a pad that doesn't support them will return an &EINVAL;.</para>
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<table pgwide="1" frame="none" id="v4l2-enum-dv-timings">
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<title>struct <structname>v4l2_enum_dv_timings</structname></title>
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<tgroup cols="3">
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@ -82,8 +90,16 @@ application.</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>[3]</entry>
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<entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
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<entry><structfield>pad</structfield></entry>
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<entry>Pad number as reported by the media controller API. This field
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is only used when operating on a subdevice node. When operating on a
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video node applications must set this field to zero.</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>[2]</entry>
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<entry>Reserved for future extensions. Drivers and applications must
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set the array to zero.</entry>
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</row>
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<row>
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<entry>&v4l2-dv-timings;</entry>
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@ -103,7 +119,7 @@ application.</entry>
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<term><errorcode>EINVAL</errorcode></term>
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<listitem>
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<para>The &v4l2-enum-dv-timings; <structfield>index</structfield>
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is out of bounds.</para>
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is out of bounds or the <structfield>pad</structfield> number is invalid.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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@ -366,6 +366,33 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
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case VIDIOC_S_EDID:
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return v4l2_subdev_call(sd, pad, set_edid, arg);
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case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
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struct v4l2_dv_timings_cap *cap = arg;
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if (cap->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
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}
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case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
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struct v4l2_enum_dv_timings *dvt = arg;
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if (dvt->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
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}
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case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
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return v4l2_subdev_call(sd, video, query_dv_timings, arg);
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case VIDIOC_SUBDEV_G_DV_TIMINGS:
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return v4l2_subdev_call(sd, video, g_dv_timings, arg);
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case VIDIOC_SUBDEV_S_DV_TIMINGS:
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return v4l2_subdev_call(sd, video, s_dv_timings, arg);
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#endif
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default:
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return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
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@ -162,8 +162,13 @@ struct v4l2_subdev_selection {
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#define VIDIOC_SUBDEV_S_CROP _IOWR('V', 60, struct v4l2_subdev_crop)
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#define VIDIOC_SUBDEV_G_SELECTION _IOWR('V', 61, struct v4l2_subdev_selection)
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#define VIDIOC_SUBDEV_S_SELECTION _IOWR('V', 62, struct v4l2_subdev_selection)
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/* These two G/S_EDID ioctls are identical to the ioctls in videodev2.h */
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/* The following ioctls are identical to the ioctls in videodev2.h */
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#define VIDIOC_SUBDEV_G_EDID _IOWR('V', 40, struct v4l2_edid)
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#define VIDIOC_SUBDEV_S_EDID _IOWR('V', 41, struct v4l2_edid)
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#define VIDIOC_SUBDEV_S_DV_TIMINGS _IOWR('V', 87, struct v4l2_dv_timings)
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#define VIDIOC_SUBDEV_G_DV_TIMINGS _IOWR('V', 88, struct v4l2_dv_timings)
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#define VIDIOC_SUBDEV_ENUM_DV_TIMINGS _IOWR('V', 98, struct v4l2_enum_dv_timings)
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#define VIDIOC_SUBDEV_QUERY_DV_TIMINGS _IOR('V', 99, struct v4l2_dv_timings)
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#define VIDIOC_SUBDEV_DV_TIMINGS_CAP _IOWR('V', 100, struct v4l2_dv_timings_cap)
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#endif
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