diff options
author | Roland Stigge <stigge@antcom.de> | 2011-01-09 14:31:39 (GMT) |
---|---|---|
committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-01-09 17:10:10 (GMT) |
commit | 6099469805c24af14250e182bb9ca082b8a6b716 (patch) | |
tree | 9b08dd1a10ff89f2557575f5bf95b07babf92beb /Documentation/hwmon/ds620 | |
parent | 430400b86304ea729ba10f2966a8af67da60a37f (diff) | |
download | linux-fsl-qoriq-6099469805c24af14250e182bb9ca082b8a6b716.tar.xz |
hwmon: Support for Dallas Semiconductor DS620
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>
Diffstat (limited to 'Documentation/hwmon/ds620')
-rw-r--r-- | Documentation/hwmon/ds620 | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/hwmon/ds620 b/Documentation/hwmon/ds620 new file mode 100644 index 0000000..1fbe3cd --- /dev/null +++ b/Documentation/hwmon/ds620 @@ -0,0 +1,34 @@ +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. |