Re: [PATCH]Panasonic Hotkey Driver

[Hiroshi Miura <miura-yiisDzvROlQdnm+yROfE0A@public.gmane.org>]

At Sat, 21 Aug 2004 01:44:03 -0700,
David Bronaugh wrote:
> OK, this all makes sense now. It seems like the best way to do screen 
> brightness setting would be to read fields 2 and 3 from SINF into 
> internal fields (pcc_max_bright and pcc_min_bright?) to check user input 
> and make sure it is not outside these bounds.

these are ok?

pcc_ac_max_bright
pcc_ac_min_bright
pcc_dc_max_bright
pcc_dc_min_bright


> I don't think it is necessary to adjust (or read) fields 5 6 and 7 -- 
> could you confirm on your R3 that these are not necessary (try the 
> things I tried on my R1N)? If you can confirm this, we can simplify the 
> driver to only expose 1 field for the 'brightness' control.

I think it is necessary to adjuct field 5 6 and 7.
This sinf is kept through hibernate/power off and on.
BIOS show this field when boot or resume and set brightness according as power state.


User space utility should set these values as machine power state.

when ac/battery power state is changed, user space utility also should set
brightness as read from sinf field 4 or 7 according as power state.

One idea is driver checks power state and set proper field.
This make simplify user/kernel interface.

-- 
Hiroshi Miura  --- http://www.da-cha.org/  --- miura-yiisDzvROlQdnm+yROfE0A@public.gmane.org
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