[Unit]
Description=Configure the I2C ADT7463 for two-wire fans
ConditionKernelCommandLine=|czechlight=sdn-roadm-add-drop
ConditionKernelCommandLine=|czechlight=sdn-roadm-line
ConditionKernelCommandLine=|czechlight=sdn-roadm-coherent-a-d
ConditionKernelCommandLine=|czechlight=sdn-inline
Before=sysrepod.service

[Service]
Type=oneshot

# Configuration for two-wire fans (0b1111)
ExecStart=/sbin/i2cset -y 1 0x2e 0x73 0x0f b

# Set up the AC voltage threshold to:
# +/- 20mV: 0x00 (default)
# +/- 40mV: 0x04
# +/- 80mV: 0x08
# +/- 130mV: 0x0c
ExecStart=/sbin/i2cset -y 1 0x2e 0x7d 0x0c b

# Pulses per revolution:
# 1: 0x00
# 2: 0x55 (default)
# 3: 0xaa
# 4: 0xff
#ExecStart=/sbin/i2cset -y 1 0x2e 0x7b 0x55 b

# Faster (250ms) period for TACH monitoring
ExecStart=/sbin/i2cset -y 1 0x2e 0x78 0x08 b

# ADT7463: Register as an I2C device
ExecStart=/bin/sh -c 'echo adt7463 0x2e > /sys/bus/i2c/devices/i2c-1/new_device'

[Install]
WantedBy=multi-user.target