FB_EVENT (blank and unblank?)

["Richard Purdie" <rpurdie@rpsys.net>]

I've been looking at ways to solve a couple of code interdepencies I don't 
like with w100fb and its backlight  and touch screen drivers.

I have two places where they need to talk. The first is for the touch screen 
to query the x resolution (and to know if the screen is blanked)[1]. The 
second is to turn the backlight off when the console is blanked.

On solution I've been looking at is to use fb_register_client. I could then 
hook into mode changes and that solves one problem. There is currently no 
FB_EVENT_BLANK and  FB_EVENT_UNBLANK however. Would it be acceptable to add 
these events with appropriate hooks in fbmem.c and to use fb_register_client 
in these drivers to obtain this information?

Or can anyone see an alternative other than global variables?

[1] Presumably for interference reasons, it only queries the touchscreen 
after a hsync. The hysnc pulse can be obtained from the IO lines but to get 
the timing right, xres also needs to be known. If the screen is blank, these 
delays can be disabled...

-- 
Richard 



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