From: Hans Verkuil <hans.verk...@cisco.com>
Export the entity ID (if any) of the video device.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
Documentation/DocBook/media/v4l/vidioc-querycap.xml | 16 +++++++++++++++-
drivers/media/v4l2-core/v4l2-ioctl.c | 7 +++++++
include/uapi/linux/videodev2.h | 5 ++++-
3 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/Documentation/DocBook/media/v4l/vidioc-querycap.xml
b/Documentation/DocBook/media/v4l/vidioc-querycap.xml
index c1ed844..4a7737c 100644
--- a/Documentation/DocBook/media/v4l/vidioc-querycap.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-querycap.xml
@@ -154,7 +154,14 @@ printf ("Version: %u.%u.%u\n",
</row>
<row>
<entry>__u32</entry>
- <entry><structfield>reserved</structfield>[3]</entry>
+ <entry><structfield>entity_id</structfield></entry>
+ <entry>The media controller entity ID of the device. This is only
valid if
+ the <constant>V4L2_CAP_ENTITY</constant> capability is set.
+ </entry>
+ </row>
+ <row>
+ <entry>__u32</entry>
+ <entry><structfield>reserved</structfield>[2]</entry>
<entry>Reserved for future extensions. Drivers must set
this array to zero.</entry>
</row>
@@ -308,6 +315,13 @@ modulator programming see
fields.</entry>
</row>
<row>
+ <entry><constant>V4L2_CAP_ENTITY</constant></entry>
+ <entry>0x00400000</entry>
+ <entry>The device is a media controller entity and
+ the <structfield>entity_id</structfield> field of &v4l2-capability;
+ is valid.</entry>
+ </row>
+ <row>
<entry><constant>V4L2_CAP_READWRITE</constant></entry>
<entry>0x01000000</entry>
<entry>The device supports the <link
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c
b/drivers/media/v4l2-core/v4l2-ioctl.c
index 1476602..5179611 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1011,6 +1011,7 @@ static void v4l_sanitize_format(struct v4l2_format *fmt)
static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
+ struct video_device *vfd = video_devdata(file);
struct v4l2_capability *cap = (struct v4l2_capability *)arg;
int ret;
@@ -1019,6 +1020,12 @@ static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
ret = ops->vidioc_querycap(file, fh, cap);
cap->capabilities |= V4L2_CAP_EXT_PIX_FORMAT;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ if (vfd->entity.parent) {
+ cap->capabilities |= V4L2_CAP_ENTITY;
+ cap->entity_id = vfd->entity.id;
+ }
+#endif
/*
* Drivers MUST fill in device_caps, so check for this and
* warn if it was forgotten.
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index fa376f7..af7a667 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -307,6 +307,7 @@ struct v4l2_fract {
* @version: KERNEL_VERSION
* @capabilities: capabilities of the physical device as a whole
* @device_caps: capabilities accessed via this particular device (node)
+ * @entity_id: the media controller entity ID
* @reserved: reserved fields for future extensions
*/
struct v4l2_capability {
@@ -316,7 +317,8 @@ struct v4l2_capability {
__u32 version;
__u32 capabilities;
__u32 device_caps;
- __u32 reserved[3];
+ __u32 entity_id;
+ __u32 reserved[2];
};
/* Values for 'capabilities' field */
@@ -348,6 +350,7 @@ struct v4l2_capability {
#define V4L2_CAP_SDR_CAPTURE 0x00100000 /* Is a SDR capture device
*/
#define V4L2_CAP_EXT_PIX_FORMAT 0x00200000 /* Supports the
extended pixel format */
+#define V4L2_CAP_ENTITY 0x00400000 /* This is a Media
Controller entity */
#define V4L2_CAP_READWRITE 0x01000000 /* read/write systemcalls
*/
#define V4L2_CAP_ASYNCIO 0x02000000 /* async I/O */
--
2.1.4
--
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