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SubjectRe: [PATCH 1/3] ACPI autoloading - ACPICA adjustance
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On Tue, 2007-07-03 at 03:58 -0400, Len Brown wrote:
> On Sunday 17 June 2007 16:24, Thomas Renninger wrote:
> > Define standardized HIDs ...
>
> > Index: linux-2.6.22-rc4/include/acpi/acpi_drivers.h
> > ===================================================================
> > --- linux-2.6.22-rc4.orig/include/acpi/acpi_drivers.h
> > +++ linux-2.6.22-rc4/include/acpi/acpi_drivers.h
> > @@ -34,16 +34,33 @@
> > #define ACPI_BUS_COMPONENT 0x00010000
> > #define ACPI_SYSTEM_COMPONENT 0x02000000
> >
> > -/* _HID definitions */
> > +/*
> > + _HID definitions
> > + HIDs starting with 'X' are self defined here and are used for devices where
> > + a HID does not exist in spec.
> > + HIDs must conform to (ACPI spec - 6.1.4):
> >
> > -#define ACPI_POWER_HID "power_resource"
> > + Numeric 32-bit compressed EISA type ID are not supported (never seen one as
> > + an ACPI HID?)
> > +
> > + A valid PNP ID must be of the form AAA#### where A is an uppercase letter
> > + and # is a hex digit.
> > + A valid ACPI ID must be of the form ACPI#### where # is a hex digit.
> > +
> > + and our self-defined: XAAA#### where A is an uppercase letter and # is a hex
> > + digit.
>
> What was the criteria for inventing the XAAA#### format?
> It doesn't comply with the PNP standard format above, since
> it starts with four letters instead of three.
Yes, it still violates the standard, intend was to not do so.
And to stick to the 8/9 bytes.
The X has the same meaning as your suggestion below, starting with LNX,
it should be visible that it is an out of spec, linux only hid.
>
> I don't think that "XVID0001" will be more meaningful than "video"
> when seen in sysfs...
>
> > +*/
> > +
> > +#define ACPI_POWER_HID "XPWR0001"
> > #define ACPI_PROCESSOR_HID "ACPI0007"
> > -#define ACPI_SYSTEM_HID "acpi_system"
> > -#define ACPI_THERMAL_HID "thermal"
> > -#define ACPI_BUTTON_HID_POWERF "button_power"
> > -#define ACPI_BUTTON_HID_SLEEPF "button_sleep"
> > -#define ACPI_VIDEO_HID "video"
> > -#define ACPI_BAY_HID "bay"
> > +#define ACPI_SYSTEM_HID "XSYS0001"
> > +#define ACPI_THERMAL_HID "XTHM0001"
> > +#define ACPI_BUTTON_HID_POWERF "XPBT0001"
> > +#define ACPI_BUTTON_HID_SLEEPF "XSBT0001"
> > +#define ACPI_VIDEO_HID "XVID0001"
> > +#define ACPI_BAY_HID "XBAY0001"
> > +
>
> If the criteria is to stay within an 8 character id length,
> I'd rather spell a word with capital letters, and stick
> in 0's where we don't need more letters:
>
> POWER000
> SYSTEM00
> THERMAL0
> PWRBTN00
> SLEEPBTN
> VIDEO000
> DRIVEBAY
>
> Or when we discussed this before, we though about not conflicting
> with a standard (or vendor standard) name by becoming the Linux vendor --
> say using the "LNX" prefix, and trying to spell something useful
> in the remaining 5 characters. eg.
>
> LNXPOWER
> LNXSYSTM
> LNXTHERM
> LNXSLPBN
> LNXPWRBN
> LNXVIDEO
> LNXIOBAY

Don't know what is better, the first solution looks nicer...
Just tell me the final suggestion and I redo the patch.

Thomas

PS: What is your general impression of the patches, will you add the
next series to acpi-test?
Shall I wait for some other patch(es) and then rebase, this one touches
nearly every file in /drivers/acpi/*.c and could end up in some merge
work for me or others.

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