My inclination would be to have the sysfs interface know generic terms, with the implementation mapping them to device-specific terms. It ought to be possible to build portable tools that don't have to know about device-specific states and have the device interfaces (in sysfs) do the necessary translation. However, I also think there is value in having the sysfs interface recognize the device-specific values as well, so that device-specific tools can also be written (offering the option of taking advantage of special capabilities of a particular device). scott | On St 04-01-06 17:06:09, Alan Stern wrote: | > On Wed, 4 Jan 2006, Pavel Machek wrote: | > | > > > As I mentioned in the thread (currently happening, BTW) on the linux-pm | > > > list, what you want to do is accept a string that reflects an actual state | > > > that the device supports. For PCI devices that support low-power states, | > > > this would be "D1", "D2", "D3", etc. For USB devices, which only support | > > > an "on" and "suspended" state, the values that this patch parses would | > > > actually work. | > > | > > We want _common_ values, anyway. So, we do not want "D0", "D1", "D2", | > > "D3hot" in PCI cases. We probably want "on", "D1", "D2", "suspend", | > > and I'm not sure about those "D1" and "D2" parts. Userspace should not | > > have to know about details, it will mostly use "on"/"suspend" anyway. | > | > It would be good to make the details available so that they are there when | > needed. For instance, we might export "D0", "on", "D1", "D2", "D3", and | > "suspend", treating "on" as a synonym for "D0" and "suspend" as a synonym | > for "D3". | | Why to make it this complex? | | I do not think there's any confusion possible. "on" always corresponds | to "D0", and "suspend" is "D3". Anyone who knows what "D2" means, | should know that, too... | Pavel | -- | Thanks, Sharp! | | --===============85566774732936779== | ---------- | _______________________________________________ | linux-pm mailing list | linux-pm@xxxxxxxxxxxxxx | https://lists.osdl.org/mailman/listinfo/linux-pm | | --===============85566774732936779==-- -- scott preece motorola mobile devices, il67, 1800 s. oak st., champaign, il 61820 e-mail: preece@xxxxxxxxxxxx fax: +1-217-384-8550 phone: +1-217-384-8589 cell: +1-217-433-6114 pager: 2174336114@xxxxxxxxx
