[lm-sensors] [PATCH 1/3] hwmon: Driver for SMM665 Six-Channel Active DC Output Controller/Monitor
kernel at jic23.retrosnub.co.uk
Sat Jun 19 12:08:07 CEST 2010
On 06/19/10 09:27, Jean Delvare wrote:
> On Fri, 18 Jun 2010 12:13:25 -0700, Guenter Roeck wrote:
>> On Fri, 2010-06-18 at 14:10 -0400, Jonathan Cameron wrote:
>>> Another quick query. Are the _min / _max attributes as defined in the
>>> abi meant for alarms? I always thought they were to tell userspace the
>>> limits on measurement?
>> Good question. I thought it is supposed to refer to alarm limits, but I
>> may be wrong.
>> Browsing through a couple of drivers, it _looks_ like the values are
>> used for alarm limits (eg adm1025 or lm85). Limits are not always set to
> Yes, these are alarms. _min and _max are really misnomers, these should
> have been _low and _high but by the time I realized it, _min and _max
> were already de facto standards and it was too late to change this.
> Documentation/hwmon/sysfs-interface says:
> Usual items are "input" (measured value), "max" (high threshold,
> "min" (low threshold).
Ah, I missed that general defining of terms. It's fine as is unless we end
up with lots of people not reading it properly like me ;)
> Specific occurrences are then left without details. If you think this
> document can be improved, I welcome patches.
>> useful values, though. This is what my CPU board returns:
>> Adapter: SMBus PIIX4 adapter at 0580
>> V1.5: +1.80 V (min = +0.00 V, max = +3.32 V)
>> VCore: +1.29 V (min = +0.00 V, max = +2.99 V)
>> V3.3: +3.32 V (min = +0.00 V, max = +4.38 V)
>> V5: +5.00 V (min = +0.00 V, max = +6.64 V)
>> V12: +12.12 V (min = +0.00 V, max = +15.94 V)
>> The lm85 datasheet says: "If a voltage input either exceeds the value
>> set in the voltage high limit register or falls below the value set in
>> the voltage low limit register, the corresponding bit will be set
>> automatically by the LM85 in the interrupt status registers (41-42h)."
>>> Either way, one of us has misunderstood so perhaps the documentation needs
>>> to be more specific....
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