swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
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Tip revision: 17b57b1883c1285f3d0dc2266e8f79286a7bef38 authored by Greg Kroah-Hartman on 30 September 2018, 14:15:35 UTC
Linux 4.19-rc6
Linux 4.19-rc6
Tip revision: 17b57b1
lm77
Kernel driver lm77
==================
Supported chips:
* National Semiconductor LM77
Prefix: 'lm77'
Addresses scanned: I2C 0x48 - 0x4b
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
Author: Andras BALI <drewie@freemail.hu>
Description
-----------
The LM77 implements one temperature sensor. The temperature
sensor incorporates a band-gap type temperature sensor,
10-bit ADC, and a digital comparator with user-programmable upper
and lower limit values.
The LM77 implements 3 limits: low (temp1_min), high (temp1_max) and
critical (temp1_crit.) It also implements an hysteresis mechanism which
applies to all 3 limits. The relative difference is stored in a single
register on the chip, which means that the relative difference between
the limit and its hysteresis is always the same for all 3 limits.
This implementation detail implies the following:
* When setting a limit, its hysteresis will automatically follow, the
difference staying unchanged. For example, if the old critical limit
was 80 degrees C, and the hysteresis was 75 degrees C, and you change
the critical limit to 90 degrees C, then the hysteresis will
automatically change to 85 degrees C.
* All 3 hysteresis can't be set independently. We decided to make
temp1_crit_hyst writable, while temp1_min_hyst and temp1_max_hyst are
read-only. Setting temp1_crit_hyst writes the difference between
temp1_crit_hyst and temp1_crit into the chip, and the same relative
hysteresis applies automatically to the low and high limits.
* The limits should be set before the hysteresis.