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authorHans Verkuil <hans.verkuil@cisco.com>2012-01-11 06:45:05 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-01-23 16:34:27 -0200
commit583aa3a9b5ca846a84f7dd87bdc4b75dca07b011 (patch)
treea86d9d5f2e9817e9faf9d2e06d212d4380924fe9 /include/linux/videodev2.h
parent93596ef7db3e9bcc9306c3e93cf28ce1048858b6 (diff)
downloadlinux-583aa3a9b5ca846a84f7dd87bdc4b75dca07b011.tar.gz
[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>
Diffstat (limited to 'include/linux/videodev2.h')
-rw-r--r--include/linux/videodev2.h29
1 files changed, 20 insertions, 9 deletions
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index 5e11f8a1f867..0db05033c2ec 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -235,16 +235,25 @@ struct v4l2_fract {
__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 @@ struct v4l2_capability {
#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
*/