OpenWrt 24.10.0 (Vanilla)
Install package
opkg update
opkg install kmod-hwmon-pwmfan
and reboot router
Disable fan
/bin/echo '0' > /sys/class/hwmon/hwmon2/pwm1_enable
Enable fan
/bin/echo '1' > /sys/class/hwmon/hwmon2/pwm1_enable
Control fan
/bin/echo '255' > /sys/class/hwmon/hwmon2/pwm1
/bin/echo '127' > /sys/class/hwmon/hwmon2/pwm1
/bin/echo '63' > /sys/class/hwmon/hwmon2/pwm1
255 = max
127 = middle
63 = minimal (silent)