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[media] v4l: Add support for DV timings ioctls on subdev nodes

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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 2014-01-29 10:07:13 -03:00 committed by Mauro Carvalho Chehab
parent c4fa146ce5
commit 9cfd65e809
4 changed files with 78 additions and 13 deletions
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27
Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
View File

@ -1,11 +1,12 @@
<refentry id="vidioc-dv-timings-cap">
<refmeta>
<refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP</refentrytitle>
<refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname>VIDIOC_DV_TIMINGS_CAP</refname>
<refname>VIDIOC_SUBDEV_DV_TIMINGS_CAP</refname>
<refpurpose>The capabilities of the Digital Video receiver/transmitter</refpurpose>
</refnamediv>
@ -33,7 +34,7 @@
<varlistentry>
<term><parameter>request</parameter></term>
<listitem>
<para>VIDIOC_DV_TIMINGS_CAP</para>
<para>VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</para>
</listitem>
</varlistentry>
<varlistentry>
@ -54,10 +55,19 @@
interface and may change in the future.</para>
</note>
<para>To query the capabilities of the DV receiver/transmitter applications can call
this ioctl and the driver will fill in the structure. Note that drivers may return
<para>To query the capabilities of the DV receiver/transmitter applications
can call the <constant>VIDIOC_DV_TIMINGS_CAP</constant> ioctl on a video node
and the driver will fill in the structure. Note that drivers may return
different values after switching the video input or output.</para>
<para>When implemented by the driver DV capabilities of subdevices can be
queried by calling the <constant>VIDIOC_SUBDEV_DV_TIMINGS_CAP</constant> ioctl
directly on a subdevice node. The capabilities are specific to inputs (for DV
receivers) or outputs (for DV transmitters), applications must specify the
desired pad number in the &v4l2-dv-timings-cap; <structfield>pad</structfield>
field. Attempts to query capabilities on a pad that doesn't support them will
return an &EINVAL;.</para>
<table pgwide="1" frame="none" id="v4l2-bt-timings-cap">
<title>struct <structname>v4l2_bt_timings_cap</structname></title>
<tgroup cols="3">
@ -127,7 +137,14 @@ different values after switching the video input or output.</para>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>reserved</structfield>[3]</entry>
<entry><structfield>pad</structfield></entry>
<entry>Pad number as reported by the media controller API. This field
is only used when operating on a subdevice node. When operating on a
video node applications must set this field to zero.</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>reserved</structfield>[2]</entry>
<entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
</row>
<row>

30
Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml
View File

@ -1,11 +1,12 @@
<refentry id="vidioc-enum-dv-timings">
<refmeta>
<refentrytitle>ioctl VIDIOC_ENUM_DV_TIMINGS</refentrytitle>
<refentrytitle>ioctl VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname>VIDIOC_ENUM_DV_TIMINGS</refname>
<refname>VIDIOC_SUBDEV_ENUM_DV_TIMINGS</refname>
<refpurpose>Enumerate supported Digital Video timings</refpurpose>
</refnamediv>
@ -33,7 +34,7 @@
<varlistentry>
<term><parameter>request</parameter></term>
<listitem>
<para>VIDIOC_ENUM_DV_TIMINGS</para>
<para>VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS</para>
</listitem>
</varlistentry>
<varlistentry>
@ -61,14 +62,21 @@ standards or even custom timings that are not in this list.</para>
<para>To query the available timings, applications initialize the
<structfield>index</structfield> field and zero the reserved array of &v4l2-enum-dv-timings;
and call the <constant>VIDIOC_ENUM_DV_TIMINGS</constant> ioctl with a pointer to this
structure. Drivers fill the rest of the structure or return an
and call the <constant>VIDIOC_ENUM_DV_TIMINGS</constant> ioctl on a video node with a
pointer to this structure. Drivers fill the rest of the structure or return an
&EINVAL; when the index is out of bounds. To enumerate all supported DV timings,
applications shall begin at index zero, incrementing by one until the
driver returns <errorcode>EINVAL</errorcode>. Note that drivers may enumerate a
different set of DV timings after switching the video input or
output.</para>
<para>When implemented by the driver DV timings of subdevices can be queried
by calling the <constant>VIDIOC_SUBDEV_ENUM_DV_TIMINGS</constant> ioctl directly
on a subdevice node. The DV timings are specific to inputs (for DV receivers) or
outputs (for DV transmitters), applications must specify the desired pad number
in the &v4l2-enum-dv-timings; <structfield>pad</structfield> field. Attempts to
enumerate timings on a pad that doesn't support them will return an &EINVAL;.</para>
<table pgwide="1" frame="none" id="v4l2-enum-dv-timings">
<title>struct <structname>v4l2_enum_dv_timings</structname></title>
<tgroup cols="3">
@ -82,8 +90,16 @@ application.</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>reserved</structfield>[3]</entry>
<entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
<entry><structfield>pad</structfield></entry>
<entry>Pad number as reported by the media controller API. This field
is only used when operating on a subdevice node. When operating on a
video node applications must set this field to zero.</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>reserved</structfield>[2]</entry>
<entry>Reserved for future extensions. Drivers and applications must
set the array to zero.</entry>
</row>
<row>
<entry>&v4l2-dv-timings;</entry>
@ -103,7 +119,7 @@ application.</entry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The &v4l2-enum-dv-timings; <structfield>index</structfield>
is out of bounds.</para>
is out of bounds or the <structfield>pad</structfield> number is invalid.</para>
</listitem>
</varlistentry>
<varlistentry>

27
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -366,6 +366,33 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
case VIDIOC_S_EDID:
return v4l2_subdev_call(sd, pad, set_edid, arg);
case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
struct v4l2_dv_timings_cap *cap = arg;
if (cap->pad >= sd->entity.num_pads)
return -EINVAL;
return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
}
case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
struct v4l2_enum_dv_timings *dvt = arg;
if (dvt->pad >= sd->entity.num_pads)
return -EINVAL;
return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
}
case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
return v4l2_subdev_call(sd, video, query_dv_timings, arg);
case VIDIOC_SUBDEV_G_DV_TIMINGS:
return v4l2_subdev_call(sd, video, g_dv_timings, arg);
case VIDIOC_SUBDEV_S_DV_TIMINGS:
return v4l2_subdev_call(sd, video, s_dv_timings, arg);
#endif
default:
return v4l2_subdev_call(sd, core, ioctl, cmd, arg);

7
include/uapi/linux/v4l2-subdev.h
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@ -162,8 +162,13 @@ struct v4l2_subdev_selection {
#define VIDIOC_SUBDEV_S_CROP _IOWR('V', 60, struct v4l2_subdev_crop)
#define VIDIOC_SUBDEV_G_SELECTION _IOWR('V', 61, struct v4l2_subdev_selection)
#define VIDIOC_SUBDEV_S_SELECTION _IOWR('V', 62, struct v4l2_subdev_selection)
/* These two G/S_EDID ioctls are identical to the ioctls in videodev2.h */
/* The following ioctls are identical to the ioctls in videodev2.h */
#define VIDIOC_SUBDEV_G_EDID _IOWR('V', 40, struct v4l2_edid)
#define VIDIOC_SUBDEV_S_EDID _IOWR('V', 41, struct v4l2_edid)
#define VIDIOC_SUBDEV_S_DV_TIMINGS _IOWR('V', 87, struct v4l2_dv_timings)
#define VIDIOC_SUBDEV_G_DV_TIMINGS _IOWR('V', 88, struct v4l2_dv_timings)
#define VIDIOC_SUBDEV_ENUM_DV_TIMINGS _IOWR('V', 98, struct v4l2_enum_dv_timings)
#define VIDIOC_SUBDEV_QUERY_DV_TIMINGS _IOR('V', 99, struct v4l2_dv_timings)
#define VIDIOC_SUBDEV_DV_TIMINGS_CAP _IOWR('V', 100, struct v4l2_dv_timings_cap)
#endif