linux-kernel - Re: [PATCH v5] Introduce support for Systems Management Driver over WMI for Dell Systems

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Date:   Thu, 1 Oct 2020 12:04:58 -0700
From:   mark gross <mgross@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Limonciello, Mario" <Mario.Limonciello@...l.com>,
        Divya Bharathi <divya27392@...il.com>,
        "dvhart@...radead.org" <dvhart@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "Bharathi, Divya" <Divya.Bharathi@...l.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "Ksr, Prasanth" <Prasanth.Ksr@...l.com>
Subject: Re: [PATCH v5] Introduce support for Systems Management Driver over
 WMI for Dell Systems

On Thu, Oct 01, 2020 at 11:26:36AM +0200, Hans de Goede wrote:
> Hi,
> 
> On 9/30/20 11:02 PM, Limonciello, Mario wrote:
> > > > +		possible_values:	A file that can be read to obtain the possible
> > > > +					values of the <attr>. Values are separated using
> > > > +					semi-colon (``;``).
> > > why not use set notation from math classes assuming intergers?  i.e.
> > > (a, b)  all integers beween a and b but not including a or b (open set)
> > > or
> > > [a, b] all integerger betwen a and b including and b?  (closed set)
> > > 
> > > Anyway its ambiguous if the the extremes are included in the set of possible
> > > values as written.
> > > 
> > 
> > Enumeration attributes mean that there are fixed values, specifically not integers.
> > Integers are in the "integer" type and explained below.
> > 
> > An example value that would be seen here is possible_values:
> > 
> > Enabled;Disabled;
> 
> That might not be the best example, because in that case arguably we
> could export it as a boolean type (except that the WMI interface does
> not give us boolean as an explicit / separate type).
> 
> Mark these enum attributes are really like enums in C, so we
> have a fixed set of possible values which are described by
> strings, since using integers for it makes no sense from a human
> interaction pov. E.g. on the Lenovo X1C8 I have some attributes
> have the following possible value sets:
> 
>                 Package (0x03)
>                 {
>                     "High",
>                     "Normal",
>                     "Silent"
>                 },
> 
>                 Package (0x02)
>                 {
>                     "LCD",
>                     "ExternalDisplay"
>                 },
> 
>                 Package (0x02)
>                 {
>                     "Independent",
>                     "Synchronized"
>                 },
> 
> I hope this helps clarify things.
It does.  Please ignore my comment on this topic then.

thanks

--mark