[media] V4L2: Add per-device-node capabilities
If V4L2_CAP_DEVICE_CAPS is set, then the new device_caps field is filled with
the capabilities of the opened device node.
The capabilities field traditionally contains the capabilities of the physical
device, being a superset of all capabilities available at the several device
nodes. E.g., if you open /dev/video0, then if it contains VBI caps then that means
that there is a corresponding vbi node as well. And the capabilities field of
both the video and vbi nodes should contain identical caps.
However, it would be very useful to also have a capabilities field that contains
just the caps for the currently open device, hence the new CAP bit and field.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index 5e11f8a..0db0503 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -235,16 +235,25 @@
__u32 denominator;
};
-/*
- * D R I V E R C A P A B I L I T I E S
- */
+/**
+ * struct v4l2_capability - Describes V4L2 device caps returned by VIDIOC_QUERYCAP
+ *
+ * @driver: name of the driver module (e.g. "bttv")
+ * @card: name of the card (e.g. "Hauppauge WinTV")
+ * @bus_info: name of the bus (e.g. "PCI:" + pci_name(pci_dev) )
+ * @version: KERNEL_VERSION
+ * @capabilities: capabilities of the physical device as a whole
+ * @device_caps: capabilities accessed via this particular device (node)
+ * @reserved: reserved fields for future extensions
+ */
struct v4l2_capability {
- __u8 driver[16]; /* i.e. "bttv" */
- __u8 card[32]; /* i.e. "Hauppauge WinTV" */
- __u8 bus_info[32]; /* "PCI:" + pci_name(pci_dev) */
- __u32 version; /* should use KERNEL_VERSION() */
- __u32 capabilities; /* Device capabilities */
- __u32 reserved[4];
+ __u8 driver[16];
+ __u8 card[32];
+ __u8 bus_info[32];
+ __u32 version;
+ __u32 capabilities;
+ __u32 device_caps;
+ __u32 reserved[3];
};
/* Values for 'capabilities' field */
@@ -274,6 +283,8 @@
#define V4L2_CAP_ASYNCIO 0x02000000 /* async I/O */
#define V4L2_CAP_STREAMING 0x04000000 /* streaming I/O ioctls */
+#define V4L2_CAP_DEVICE_CAPS 0x80000000 /* sets device capabilities field */
+
/*
* V I D E O I M A G E F O R M A T
*/