NAME
generic_gpio - Driver for GPIO connected UPSes
SYNOPSIS
generic_gpio -h
generic_gpio -a gpiochip0 [OPTIONS]
Note
|
This man page only documents the specific features of the generic_gpio driver. For information about the core driver, see nutupsdrv(8). |
SUPPORTED HARDWARE
This is the driver for GPIO attached UPS devices.
The driver has been tested against CyberPower CyberShield CSN27U12V attached to Orange Pi Zero GPIO.
- More information about this UPS can be found here:
EXTRA ARGUMENTS
This driver supports the following optional settings in the ups.conf(5) file:
Driver control:
- rules=value
-
A string consisting of sub-strings. Each sub-string describes GPIO line states conversion formula to specific NUT state, like
nut_state=[^]line_num[logical_operation[^]line_num]...;
. Not (^) , and (&) , or (|)operations are supported for now. nut_state should correspond to NUT state, line_num to GPIO line number connected to UPS open collector pin. CyberShield CSN27U12V describes pins as:
Battery state |
State details |
GPIO line |
ON BATTERY |
Low when operating from utility line Open when operating from battery |
0 |
REPLACE BATTERY |
Low when battery is charged Open when battery fails the Self Test |
1 |
BATTERY MISSING |
Low when battery is present Open when battery is missing |
6 |
LOW BATTERY |
Low when battery is near full charge capacity Open when operating from a battery with < 20% capacity |
3 |
and rules might be defined as
rules = "OL=^0;OB=0;LB=3;RB=1;DISCHRG=0&^6;BYPASS=6;"
assuming battery pin connection to GPIO lines as listed in table. Expecting simple formula to be used for each state, extra may increase state reliability and may need to be checked on each specific UPS.
Battery Charge:
- default.battery.charge.low=value
-
An integer specifying the battery charge level reported in LB case.
CONFIGURATION
Here is an example of GPIO driver configuration in ups.conf file:
[CyberPower12v]
driver = GENERIC_GPIO
port = gpiochip0
desc = "Modem and DNS server UPS"
mfr = CyberPower
model = "CyberShield CSN27U12V"
rules = "OL=^0;OB=0;LB=3;RB=1;DISCHRG=0&^6;BYPASS=6;"
default.battery.charge.low = 20
SHUTDOWN COMMAND
This driver does not support shutdown command.
INSTALLATION
This driver is not built by default. You can build it by installing
libgpiod and running configure --with-gpio=yes
.
You also need to give proper permissions on the local serial device file (/dev/gpiochip0 for example) to allow the run-time NUT driver user account to access it, like by adding the following rule to Linux rules.d directory:
SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c '\
chown -R nut:nut /dev/gpiochip0 && chmod -R 700 /dev/gpiochip0\
AUTHOR
Modris Berzonis <modrisb@apollo.lv>
SEE ALSO
The core driver:
Internet resources:
-
The NUT (Network UPS Tools) home page: https://www.networkupstools.org/
-
libgpiod home page: https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/