Kernel driver max1668

Supported chips:

Author:

David George <david.george@ska.ac.za>

Description

This driver implements support for the Maxim MAX1668, MAX1805 and MAX1989 chips.

The three devices are very similar, but the MAX1805 has a reduced feature set; only two remote temperature inputs vs the four available on the other two ICs.

The driver is able to distinguish between the devices and creates sysfs entries as follows:

  • MAX1805, MAX1668 and MAX1989:
temp1_input ro local (ambient) temperature
temp1_max rw local temperature maximum threshold for alarm
temp1_max_alarm ro local temperature maximum threshold alarm
temp1_min rw local temperature minimum threshold for alarm
temp1_min_alarm ro local temperature minimum threshold alarm
temp2_input ro remote temperature 1
temp2_max rw remote temperature 1 maximum threshold for alarm
temp2_max_alarm ro remote temperature 1 maximum threshold alarm
temp2_min rw remote temperature 1 minimum threshold for alarm
temp2_min_alarm ro remote temperature 1 minimum threshold alarm
temp3_input ro remote temperature 2
temp3_max rw remote temperature 2 maximum threshold for alarm
temp3_max_alarm ro remote temperature 2 maximum threshold alarm
temp3_min rw remote temperature 2 minimum threshold for alarm
temp3_min_alarm ro remote temperature 2 minimum threshold alarm
  • MAX1668 and MAX1989 only:
temp4_input ro remote temperature 3
temp4_max rw remote temperature 3 maximum threshold for alarm
temp4_max_alarm ro remote temperature 3 maximum threshold alarm
temp4_min rw remote temperature 3 minimum threshold for alarm
temp4_min_alarm ro remote temperature 3 minimum threshold alarm
temp5_input ro remote temperature 4
temp5_max rw remote temperature 4 maximum threshold for alarm
temp5_max_alarm ro remote temperature 4 maximum threshold alarm
temp5_min rw remote temperature 4 minimum threshold for alarm
temp5_min_alarm ro remote temperature 4 minimum threshold alarm

Module Parameters

  • read_only: int Set to non-zero if you wish to prevent write access to alarm thresholds.