[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>

2 files changed, 45 insertions, 12 deletions

diff --git a/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml b/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
index cd7720d404ea..28a8c1e1c705 100644
--- a/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
@@ -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>
diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml b/Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml
index b3e17c1dfaf5..b9fdfeacdbcb 100644
--- a/Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml
@@ -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>