reading config parameters of omap3-isp subdevs

[Michael Jones <michael.jones@matrix-vision.de>]

Hi all,

I am playing around with some parameters in the previewer on the ISP. 
With ioctl VIDIOC_OMAP3ISP_PRV_CFG I am able to write the various 
parameters but what I'm missing is a way to read them.  For example, I 
have no way to adjust only coef2 in 'struct omap3isp_prev_wbal' while 
leaving the others unchanged.  If I could first read the whole 
omap3isp_prev_wbal structure, then I could change just the things I want 
to change.  This seems like it would be common functionality for such 
ioctls.  I didn't find any previous discussion related to this.

I could imagine either adding a r/w flag to 'struct 
omap3isp_prev_update_config' or adding a new ioctl entirely.  I think I 
would prefer the r/w flag.  Feedback?

I noticed that other ISP subdevs have similar ioctls.  Perhaps a similar 
thing would be useful there, but right now I'm only looking at the 
previewer.

-Michael

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