On 7/28/06, Vojtech Pavlik <[email protected]> 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
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