Cubietruck Battery monitor with nagios

hi all,

if someone need, I adapted for nagios the script to monitor battery cubietruck.

The script is pnp4nagios friendly.

#!/bin/bash
######################################################################################
#
# Battery info
#


/usr/sbin/i2cset -y -f 0 0x34 0x82 0xC3
# read power OPERATING MODE register @01h
POWER_OP_MODE=$(/usr/sbin/i2cget -y -f 0 0x34 0x01)
BAT_EXIST=$(($(($POWER_OP_MODE&0x20))/32))  # divide by 32 is like shifting rigth 5 times
CHARG_IND=$(($(($POWER_OP_MODE&0x40))/64))  # divide by 64 is like shifting rigth 6 times

########################################################################################
#read battery voltage   79h, 78h        0 mV -> 000h,   1.1 mV/bit      FFFh -> 4.5045 V
BAT_VOLT_LSB=$(/usr/sbin/i2cget -y -f 0 0x34 0x79)
BAT_VOLT_MSB=$(/usr/sbin/i2cget -y -f 0 0x34 0x78)

BAT_BIN=$(( $(($BAT_VOLT_MSB << 4)) | $(($(($BAT_VOLT_LSB & 0xF0)) >> 4)) ))
BAT_VOLT=$(echo "($BAT_BIN*1.1)"|bc)

# store maximum battery voltage to compare to
if [ -f "/etc/default/battery" ]; then
        source "/etc/default/battery"
else
        echo "MAX=$BAT_VOLT" > /etc/default/battery
	echo "MIN=3484" >> /etc/default/battery
fi

# integer is enough, cut down the decimals
MAX=${MAX%.*}
BAT_VOLT=${BAT_VOLT%.*}

# mainline kernel shows battery existence even if not exists. this is walkaround 
if [ "$BAT_VOLT" -ge "3200" ]; then


# if we have new max value, alter defaults
if [ "$BAT_VOLT" -gt "$MAX" ]; then 
MAX=$BAT_VOLT
sed -e 's/MAX=.*/MAX='$BAT_VOLT'/g' -i /etc/default/battery
fi

# if we have new min value, alter defaults
if [ "$BAT_VOLT" -lt "$MIN" ]; then
MIN=$BAT_VOLT
sed -e 's/MIN=.*/MIN='$BAT_VOLT'/g' -i /etc/default/battery
fi

# calculate percentage
percent=$(echo "($BAT_VOLT-$MIN)*100/($MAX-$MIN)"|bc)
fi

# define output format
output="Load : $percent% | Load_Batt=$percent;80;35;3.4;4.2;"

# if load% in range 80-10 ok
if [ "$percent" -ge 80 -a "$percent" -le 100 ]; then 
	echo "OK- $output"
	exit 0
# if load % in range 40-79 warning
elif [ "$percent" -ge 40 -a "$percent" -le 79 ]; then 
	echo "WARNING - $output" 
	exit 1
# if load % in range 0-39 critical
elif [ "$percent" -ge 0 -a "$percent" -le 39 ]; then 
	echo "CRITICAL - $output" 
	exit 2
# if check non riceve data
else	echo "UNKNOW"
        exit 3
fi

if run script for non admin user need add permission to  /usr/sbin/iscget

ex:

chmod 777 /usr/sbin/iscget

and change default permission for /dev/i2c-0

ex:

sudo nano /lib/udev/rules.d/60-i2c-tools.rules 

KERNEL=="i2c-0"     , GROUP="i2c", MODE="0660"

to

KERNEL=="i2c-0"     , GROUP="i2c", MODE="0666"

and reboot