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    SubjectRe: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface

    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!
    |
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    --
    scott preece
    motorola mobile devices, il67, 1800 s. oak st., champaign, il 61820
    e-mail: preece@motorola.com fax: +1-217-384-8550
    phone: +1-217-384-8589 cell: +1-217-433-6114 pager: 2174336114@vtext.com


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