[ltp] Re: Generic battery interface

[Shem Multinymous]

On 7/28/06, Vojtech Pavlik <vojtech@suse.cz> wrote:
>   note: It's absolutely necessary to limit the API to a well usable
>         SUBSET of a superset of the features of all drivers/devices,
>         even sacrificing obscure features to keep the API sane. One
>         example would be the HID Power spec, which simply can't be
>         supported to full extent by any sane API.

Non-standard functions must be handled reasonably within the
framework, otherwise drivers will have to build duplicate interfaces.

How about
  /sys/whatever/battery0/voltage for standard attributes
and
  /sys/whatever/battery0/thinkpad/inhibit-charge-minutes
for non-standard ones?


>   + and the kernel can change the polling frequency based on power
>         saving state changes

Likewise for cached attributes (query hardware only if N jiffies
passed since last querry, other return cached value). And that way,
hardware query frequency is never higher than what userspace actually
needs.

  Shem