max1668.rst
2.66 KB
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: http://datasheets.maxim-ic.com/en/ds/MAX1668-MAX1989.pdf
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.