how about adding FOCUS mode?

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Hello, Hans & everyone.

I'm trying to adapt the various FOCUS MODE int the NEC ISP driver.
NEC ISP supports 4 focus mode, AUTO/MACRO/MANUAL/FULL or NORMAL.
but, i think that it's a little insufficient to use V4L2 FOCUS Feature.

so, suggest that,

- change V4L2_CID_FOCUS_AUTO's type from boolean to interger, and add
the following enumerations for CID values.

enum v4l2_focus_mode {
    V4L2_FOCUS_AUTO            = 0,
    V4L2_FOCUS_MACRO        = 1,
    V4L2_FOCUS_MANUAL        = 2,
    V4L2_FOCUS_NORMAL        = 3,
    V4L2_FOCUS_LASTP        = 3,
};

how about this usage? i wanna get some advice about FOCUS MODE.

Thanks,
Riverful
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