[openwrt/openwrt] kirkwood: use 3 temperature sensors for Zyxel NSA310B

[LEDE Commits]

adrian pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/450ec48d61254e241ecfaa7d0cf9dec40473469d

commit 450ec48d61254e241ecfaa7d0cf9dec40473469d
Author: Thomas Beckler <thomas.beckler at hotmail.com>
AuthorDate: Sat May 30 23:40:03 2020 +0200

    kirkwood: use 3 temperature sensors for Zyxel NSA310B
    
    Instead of taking the input of one temperature sensor (temp1), the
    script takes into account three temperature sensors to control the
    PWM of the cooling fan.
    
    temp1 -> placed on main board
    temp2 -> placed on main board
    temp3 -> placed on or close to chipset
    
    All three temperatures give valid input for the PWM of the fan on
    NSA310 and are actually changing.
    
    Tested on two NSA310.
    
    Signed-off-by: Thomas Beckler <thomas.beckler at hotmail.com>
    Reviewed-by: Alberto Bursi <bobafetthotmail at gmail.com>
    [commit title/message facelift, code cleanup]
    Signed-off-by: Adrian Schmutzler <freifunk at adrianschmutzler.de>
---
 .../kirkwood/base-files/etc/init.d/hwmon_fancontrol  | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol b/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol
index c64ed1100c..334a2a08ef 100755
--- a/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol
+++ b/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol
@@ -27,10 +27,22 @@ boot() {
 		;;
 	zyxel,nsa310b)
 		path_to_hwmon='/sys/devices/platform/ocp at f1000000/f1011000.i2c/i2c-0/0-002e/hwmon/hwmon0'
-		echo 2 > "$path_to_hwmon/pwm1_enable" # fan is on pwm1
-		echo 1 > "$path_to_hwmon/pwm1_auto_channels" # temp1 is the only one that changes
-		echo 23000 > "$path_to_hwmon/temp1_auto_temp_min"
-		echo 43000 > "$path_to_hwmon/temp1_auto_temp_max" # next step is 49600 millicelsius, or 50 celsius, 43 celsius is better
+		# use the max. value of (temp1) OR (temp2) OR (temp3) as an input
+		# for the PWM of the cooling fan
+		echo 123 > "$path_to_hwmon/pwm1_auto_channels"
+		# Temperature sensor #1 placed on mainboard
+		echo 30000 > "$path_to_hwmon/temp1_auto_temp_min"
+		echo 49600 > "$path_to_hwmon/temp1_auto_temp_max"
+		# Temperature sensor #2 placed on mainboard
+		# range: 0 to 127000 in steps of 1000 [millicelsius]
+		echo 30000 > "$path_to_hwmon/temp2_auto_temp_min"
+		# range: 0 to 127000 in steps of ???? [millicelsius]
+		echo 49600 > "$path_to_hwmon/temp2_auto_temp_max"
+		# Temperature sensor #3 placed close to a chipset
+		# range: 0 to 60000 in steps of 1000 [millicelsius]
+		echo 23000 > "$path_to_hwmon/temp3_auto_temp_min"
+		# pre-defined steps: 103000, 122000, 143300, 170000 in [millicelsius]
+		echo 103000 > "$path_to_hwmon/temp3_auto_temp_max"
 		;;
 	esac
 }