(Phil) Added a driver for the Analog Devices ADM1021. The ADM1021 is
basically an expanded LM75. It can have an external temp probe (in
addition to the internal one), customizable conversion rate (in # of times
per second, depending on power consumption requirements), and
actually has a device-id register for easier/more-certain detecting!
The only strange property is the low-limit. The low-limit doesn't act
as a Hystersis value like the LM75. I.e., if the temp falls below it,
it triggers an alarm instead of clearing it. Strange, ey? This makes
using the chip for a thermostat control (like for a fan) much harder.
But it *could* be used to turn on a heater to prevent your computer from
freezing. :')
Here's what my output looks like (without a remote sensor. temp's
are the same format as the LM75 [high-limit, low-limit, value]):
[root@penn adm1021-i2c-0-18]# ls -l
total 0
-r--r--r-- 1 root root 0 Jan 9 23:42 die_code
-rw-r--r-- 1 root root 0 Jan 9 23:42 remote_temp
-r--r--r-- 1 root root 0 Jan 9 23:42 status
-rw-r--r-- 1 root root 0 Jan 9 23:42 temp
[root@penn adm1021-i2c-0-18]# cat *
3
60 20 0
76
60 20 24
PS- all temp values in the ADM1021 (limits and readings) are signed
(2's comp) bytes. So, all readings go from -128 to 127 C (actually,
the docs say it can only reliable sense down to -65), and only
in whole degree increments.
