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authorHans Verkuil <hans.verkuil@cisco.com>2020-05-07 17:12:52 +0200
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-05-12 17:05:31 +0200
commit6446ec6cbf46483737e832cd6050885fa8eb87fa (patch)
treeaa755171f8db869b92ecf646023c1d9e48cae10a /drivers/media
parentfb15db8c0060e73317a7872986b909343504eb84 (diff)
media: v4l2-subdev: add VIDIOC_SUBDEV_QUERYCAP ioctl
While normal video/radio/vbi/swradio nodes have a proper QUERYCAP ioctl that apps can call to determine that it is indeed a V4L2 device, there is currently no equivalent for v4l-subdev nodes. Adding this ioctl will solve that, and it will allow utilities like v4l2-compliance to be used with these devices as well. SUBDEV_QUERYCAP currently returns the version and capabilities of the subdevice. Define a capability flag to report if the subdevice is registered in read-only mode. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/v4l2-core/v4l2-subdev.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 174778f9c0bc..665b0c0f74cf 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -15,6 +15,7 @@
#include <linux/types.h>
#include <linux/videodev2.h>
#include <linux/export.h>
+#include <linux/version.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
@@ -344,6 +345,16 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
int rval;
switch (cmd) {
+ case VIDIOC_SUBDEV_QUERYCAP: {
+ struct v4l2_subdev_capability *cap = arg;
+
+ memset(cap->reserved, 0, sizeof(cap->reserved));
+ cap->version = LINUX_VERSION_CODE;
+ cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
+
+ return 0;
+ }
+
case VIDIOC_QUERYCTRL:
/*
* TODO: this really should be folded into v4l2_queryctrl (this