linux-kernel - Re: [PATCH v3 2/4] hwmon: (lm90) use macro defines for the status bit

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Date:	Wed, 30 Oct 2013 09:11:17 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Wei Ni <wni@...dia.com>, thierry.reding@...il.com,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 2/4] hwmon: (lm90) use macro defines for the status bit

On Wed, Oct 30, 2013 at 04:33:26PM +0100, Jean Delvare wrote:
> Hi Guenter,
> 
> On Mon, 15 Jul 2013 10:33:22 -0700, Guenter Roeck wrote:
> > On Mon, Jul 15, 2013 at 06:57:27PM +0200, Jean Delvare wrote:
> > > Unrelated to this patch, but Guenter, I am worried about the MAX6696
> > > handling here. I realize that I am the one who accepted your code, but
> > > now it looks wrong. Specifically:
> > > * We check for (status2 & 0xfe) i.e. 7 alarm bits, but the code below
> > >   only reports 2 alarms bits. So if any of the 5 other alarm bits in
> > >   STATUS2 are, we may return true (chip is tripped) but not print the
> > >   cause.
> > > * At least bits 1 and 2 of STATUS 2 fit totally fine in the driver as
> > >   it currently exists, so I can't think of any reason for not handling
> > >   them. Why are we not? Ideally we should print a message for every
> > >   alarm bit so that we never return "true" without printing a message.
> > >   Even though OT2 limits aren't handled by the driver...
> > > * If you think this piece of code shouldn't deal with OT/THERM limits
> > >   because they do not trigger an SMBus alarm, this can be discussed,
> > >   but all chips should be handled the same in this respect then.
> > > * Why in the first place is max6696's data->alert_alarms set to 0x187c
> > >   and not 0x1c7c? Including 1OPEN but not 2OPEN makes no sense.
> > 
> > I am about to leave for vacation, so this will have to wait for a couple of
> > weeks. I'll look at it after I am back.
> 
> Are you back now? ;-)
> 
Yes, only I completely forgot about this :-). I'll add it to my task list.

Guenter
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