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[media] V4L2: Add per-device-node capabilities

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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>
This commit is contained in:
Hans Verkuil 2012-01-11 06:45:05 -03:00 • committed by Mauro Carvalho Chehab
parent 93596ef7db
commit 583aa3a9b5
7 changed files with 69 additions and 17 deletions
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29
include/linux/videodev2.h
View file

@ -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
*/