From: Denis OSTERLAND <denis.osterland-85mDkmTllUAAvxtiuMwx3w@public.gmane.org>
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Subject: Re: [PATCH 4/4] rtc: isl1208: add support for isl1219 with hwmon for tamper detection
Date: Tue, 30 Jan 2018 11:40:10 +0000 [thread overview]
Message-ID: <1517312409.5307.22.camel@diehl.com> (raw)
In-Reply-To: <20180130102740.GD2809-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org>
Am Dienstag, den 30.01.2018, 11:27 +0100 schrieb Alexandre Belloni:
> On 29/01/2018 at 13:59:19 -0800, Guenter Roeck wrote:
> >
> > On Wed, Jan 24, 2018 at 10:03:33AM +0100, Michael Grzeschik wrote:
> > [ ... ]
> > >
> > > >
> > > > >
> > > > > +
> > > > > diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
> > > > > index fc337c317c673..a12b3c2b2a18c 100644
> > > > > --- a/Documentation/hwmon/sysfs-interface
> > > > > +++ b/Documentation/hwmon/sysfs-interface
> > > > > @@ -702,6 +702,13 @@ intrusion[0-*]_alarm
> > > > > the user. This is done by writing 0 to the file. Writing
> > > > > other values is unsupported.
> > > > >
> > > > > +intrusion[0-*]_timestamp
> > > > > + Chassis intrusion detection
> > > > > + YYYY-MM-DD HH:MM:SS UTC (ts.sec): intrusion detected
> > > > > + RO
> > > > > + The corresponding timestamp on which the intrustion
> > > > > + was detected.
> > > > > +
> > > > Sneaky. Nack. You don't just add attributes to the ABI because you want it,
> > > > without serious discussion, and much less so hidden in an RTC driver
> > > > (and even less as unparseable attribute).
> > > Right; but it was not meant to be sneaky. I should have stick to my first
> > > thought and label this patch RFC. Sorry for that.
> > >
> > > >
> > > > In addition to that, I consider the attribute unnecessary. The intrusion
> > > > already generates an event which should be sufficient for all practical
> > > > purposes.
> > > Would it make sense in between the other sysfs attributes of this driver?
> > >
> > I don't understand what you mean with that, sorry.
> >
> > From an ABI perspective, the attibute doesn't add value since it is
> > highly device specific (or at least it is the only chip I am aware of
> > which reports such a time stamp). Feel free to add the attribute to the
> > driver and document it, but not as part of the hwmon ABI. In that
> > case I would be inclined to accept it. However, keep in mind that
> > your version, reporting a human readable date/time, would effectively
> > preclude it from ever making it into the ABI.
> >
> Actually, there are many RTCs that are able to register one or more
> timestamps. My plan was to add support for that soon but I was not
> planning to do so in the hwmon ABI as this may be used for something
> that is not intrusion detection (interval timers for example).
What would you suggest?
I think about something like this:
event[0-*]_timestamp: timestamp in seconds since epoch or empty if not triggered
event[0-*]_alarm: 1 if event was triggered, else 0; write 0 to clear event
>
>
Diehl AKO Stiftung & Co. KG, Pfannerstraße 75-83, 88239 Wangen im Allgäu
Bereichsvorstand: Dr.-Ing. Michael Siedentop (Sprecher), Josef Fellner (Mitglied)
Sitz der Gesellschaft: Wangen i.A. – Registergericht: Amtsgericht Ulm HRA 620609 – Persönlich haftende Gesellschafterin: Diehl Verwaltungs-Stiftung – Sitz: Nürnberg – Registergericht: Amtsgericht Nürnberg HRA 11756 –
Vorstand: Dr.-Ing. E.h. Thomas Diehl (†) (Vorsitzender), Herr Dipl.-Wirtsch.-Ing. Wolfgang Weggen (stellvertretender Vorsitzender), Dipl.-Kfm. Claus Günther, Dipl.-Kfm. Frank Gutzeit, Dr.-Ing. Heinrich Schunk, Dr.-Ing. Michael Siedentop , Dipl.-Kfm. Dr.-Ing. Martin Sommer, Dipl.-Ing. (FH) Rainer von Borstel, Vorsitzender des Aufsichtsrates: Dr. Klaus Maier
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next prev parent reply other threads:[~2018-01-30 11:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-23 12:17 [PATCH 0/4] rtc: isl1208: fixes, documentation and isl1219 support Michael Grzeschik
[not found] ` <20180123121801.4214-1-m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2018-01-23 12:17 ` [PATCH 1/4] rtc: isl1208: Fix unintended clear of SR bits Michael Grzeschik
[not found] ` <20180123121801.4214-2-m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2018-02-14 20:26 ` Alexandre Belloni
2018-02-15 7:27 ` Denis OSTERLAND
[not found] ` <1518679666.5448.4.camel-85mDkmTllUAAvxtiuMwx3w@public.gmane.org>
2018-02-15 8:30 ` Alexandre Belloni
2018-01-23 12:17 ` [PATCH 2/4] rtc: isl1208: Add device tree binding documentation Michael Grzeschik
2018-01-29 23:34 ` Rob Herring
2018-01-30 10:06 ` Alexandre Belloni
2018-01-23 12:18 ` [PATCH 4/4] rtc: isl1208: add support for isl1219 with hwmon for tamper detection Michael Grzeschik
[not found] ` <20180123121801.4214-5-m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2018-01-23 18:22 ` Guenter Roeck
2018-01-24 9:03 ` Michael Grzeschik
2018-01-24 12:10 ` Michael Grzeschik
[not found] ` <20180124090333.r5o2mzpm4q536w4r-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2018-01-29 21:59 ` Guenter Roeck
2018-01-30 10:27 ` Alexandre Belloni
[not found] ` <20180130102740.GD2809-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org>
2018-01-30 11:40 ` Denis OSTERLAND [this message]
[not found] ` <1517312409.5307.22.camel-85mDkmTllUAAvxtiuMwx3w@public.gmane.org>
2018-01-30 14:15 ` Guenter Roeck
2018-01-31 10:54 ` Alexandre Belloni
2018-01-29 23:41 ` Rob Herring
2018-01-30 8:56 ` Denis OSTERLAND
2018-01-30 14:41 ` Rob Herring
[not found] ` <CAL_JsqKEXtL0hvEgFALKaCgW2Go==wj14_dDomdK_hPU23oXLQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-30 14:44 ` Rob Herring
2018-01-23 12:18 ` [PATCH 3/4] rtc: isl1208: enable interrupt after context preparation Michael Grzeschik
2018-01-30 10:34 ` Alexandre Belloni
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