Kernel driver max1668

Supported chips:

• Maxim MAX1668, MAX1805 and MAX1989

  Prefix: 'max1668'

  Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e

  Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX1668-MAX1989.pdf

Author:

David George <[email protected]>

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.