Hello Hans,
On 11/07/2011 11:37 AM, Hans Verkuil wrote:
> From: Hans Verkuil<[email protected]>
>
> 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 whole
> device. E.g., if you open 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 node 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<[email protected]>
> ---
> include/linux/videodev2.h | 7 +++++--
> 1 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
> index 4b752d5..2b6338b 100644
> --- a/include/linux/videodev2.h
> +++ b/include/linux/videodev2.h
> @@ -243,8 +243,9 @@ struct v4l2_capability {
> __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];
> + __u32 capabilities; /* Global device capabilities */
> + __u32 device_caps; /* Device node capabilities */
How about changing this to
__u32 devnode_caps; /* Device node capabilities */
> + __u32 reserved[3];
> };
>
> /* Values for 'capabilities' field */
> @@ -274,6 +275,8 @@ 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 */
..and
#define V4L2_CAP_DEVNODE_CAPS 0x80000000 /* sets device node
capabilities field */
?
'device' might suggest a whole physical device/system at first sight.
Maybe devnode_caps is not be the best name but it seems more explicit and
less confusing :)
It's just my personal opinion though.
--
Regards,
Sylwester
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