Re: [PATCH 0/3] Generic sysfs support for ACPI ALS and other ALS devices

Pavel Machek
2009-08-06T09:53:05Z

Hi!

> > Yes, so just export
> >
> > ALS exports
> > 1. the current ambient light illuminance
> > 2. the current mapped ambient light illuminance
> >
> In fact, only one attribute is enough.

Good. (I thought you would want to export the 1) too, mainly for debugging).

> The ALS driver can query the current illuminance, parse the mapping and
> only export the display luminance adjustment values to user space.

> then user space just needs to
> 1. set a brightness level as the base point
> 2. get the display adjustment value and calculate a proper brightness
> level at any time.
>
> this is easier, but it makes me feel that this doesn't look like an
> _ALS_ device any more.
> We still should export some ALS properties to user space, shouldn't
> we?

Why? Just because ACPI specs is ugly does not mean we should make
Linux ugly, too. Please just use suggestion above.

> Could you please look at the documentation about ALS sysfs class in the
> patch I sent out just now, and comment on that one please? thanks!

I did. The interface is too ugly to live.
Pavel

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