mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Roland Stigge](/assets/img/avatar_default.png)
Driver for Dallas Semiconductor DS620 temperature sensor and thermostat Signed-off-by: Roland Stigge <stigge@antcom.de> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
34 lines
1.3 KiB
Text
34 lines
1.3 KiB
Text
Kernel driver ds620
|
|
===================
|
|
|
|
Supported chips:
|
|
* Dallas Semiconductor DS620
|
|
Prefix: 'ds620'
|
|
Datasheet: Publicly available at the Dallas Semiconductor website
|
|
http://www.dalsemi.com/
|
|
|
|
Authors:
|
|
Roland Stigge <stigge@antcom.de>
|
|
based on ds1621.c by
|
|
Christian W. Zuckschwerdt <zany@triq.net>
|
|
|
|
Description
|
|
-----------
|
|
|
|
The DS620 is a (one instance) digital thermometer and thermostat. It has both
|
|
high and low temperature limits which can be user defined (i.e. programmed
|
|
into non-volatile on-chip registers). Temperature range is -55 degree Celsius
|
|
to +125. Between 0 and 70 degree Celsius, accuracy is 0.5 Kelvin. The value
|
|
returned via sysfs displays post decimal positions.
|
|
|
|
The thermostat function works as follows: When configured via platform_data
|
|
(struct ds620_platform_data) .pomode == 0 (default), the thermostat output pin
|
|
PO is always low. If .pomode == 1, the thermostat is in PO_LOW mode. I.e., the
|
|
output pin PO becomes active when the temperature falls below temp1_min and
|
|
stays active until the temperature goes above temp1_max.
|
|
|
|
Likewise, with .pomode == 2, the thermostat is in PO_HIGH mode. I.e., the PO
|
|
output pin becomes active when the temperature goes above temp1_max and stays
|
|
active until the temperature falls below temp1_min.
|
|
|
|
The PO output pin of the DS620 operates active-low.
|