First version

README.md

@@ -1,2 +1,16 @@
 # asrock-pwm-ipmi
 
+This is a script to control 4-pin PWM fans on ASRock Rack motherboards with IPMI. The BMC does not properly expose fan control, so they must be controlled using raw IPMI commands. This script is a user-friendly way to do that.
+
+
+usage: asrock-pwm-ipmi [-h] [-i] [FAN:SPEED [FAN:SPEED ...]]
+
+Read information about and control fans on ASRock boards with IPMI.
+
+positional arguments:
+  FAN:SPEED   Fan to change the speed of, and the speed, separated by ':'. Set
+              to 0 for auto.
+
+optional arguments:
+  -h, --help  show this help message and exit
+  -i, --info  Read fan information

asrock-pwm-ipmi

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+#!/bin/bash
+./pwm.py $@

pwm.py

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+#!/usr/bin/python3
+import run_cmd
+import argparse
+
+MAXFAN = 6
+
+parser = argparse.ArgumentParser(description='Read information about and control fans on ASRock boards with IPMI.', prog='asrock-pwm-ipmi')
+parser.add_argument('fanplusspeed', nargs='*', metavar='FAN:SPEED',
+                   help='Fan to change the speed of, and the speed, separated by \':\'. Set to 0 for auto.')
+#parser.add_argument('SPEED', type=int, nargs='+',
+#                   help='Speed to set FAN to')
+parser.add_argument('-i', '--info', action="store_true", default=False,
+                   help='Read fan information')
+
+
+args = parser.parse_args()
+#print(args.info)
+#print(args)
+#print(args.fanplusspeed)
+if args.info is False and args.fanplusspeed == []:
+	print("Nothing to do! See --help for usage.")
+	quit
+if args.fanplusspeed != []:
+	for fanopt in args.fanplusspeed:
+		if str(fanopt.split(":"))[2:-2] == fanopt or int(fanopt.split(":")[0]) < 1 or int(fanopt.split(":")[0]) > MAXFAN:
+			print("Improper format!")
+			continue
+		fan, speed = fanopt.split(":")
+		run_cmd.setSpeed(int(fan), int(speed))
+		if int(speed) == 0:
+			print("Set speed of FAN" + fan + " to Auto.")
+		else:
+			print("Set speed of FAN" + fan + " to " + speed + "%.")
+if args.info is True:
+	print("\nRetrieving fan speeds...\n")
+	for line in run_cmd.getFanInfo():
+		print(line)

run_cmd.py

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+#!/usr/bin/python3
+import subprocess as sp
+
+def setSpeed(fan, setspeed):
+	speeds, speedsRaw = getAllSpeeds()
+	speedcmd = ["ipmitool", "raw", "0x3a", "0x01"]
+	for speed in speedsRaw:
+		hexspeed = "0x"
+		hexspeed += str(speed)
+		speedcmd.append(hexspeed)
+	speedcmd.append("0x00") # append the mystery (unused) extra values
+	speedcmd.append("0x00")
+	speedcmd[fan + 3] = hex(setspeed) # index + 3 because the array already has the beginning of the command
+	#print(speeds)
+	sp.call(speedcmd)
+
+def getAllSpeeds():
+	cmdoutput = sp.Popen(["ipmitool", "raw", "0x3a", "0x02"], stdout=sp.PIPE)
+	speedsRaw, err = cmdoutput.communicate()
+	speedsRaw = str(speedsRaw)[3:20].split()
+	speeds = []
+	for speed in speedsRaw:
+		speeds.append(int(speed, 16))
+	return speeds, speedsRaw
+
+def getSpeed(fan):
+	speeds, speedsRaw = getAllSpeeds()
+	return speeds[fan - 1]
+
+def getFanInfo():
+	cmdoutput = sp.Popen(["ipmitool", "sdr"], stdout=sp.PIPE)
+	sensorinfo, err = cmdoutput.communicate()
+	#print(sensorinfo.splitlines())
+	faninfo = []
+	speeds, speedsRaw= getAllSpeeds()
+	for line in sensorinfo.splitlines():
+		if "FAN" in str(line):
+			faninfo.append(str(line))
+	for index, line in enumerate(faninfo):
+		faninfo[index] = str(line)[2:-1]
+		faninfo[index] += " | "
+		if speeds[index] == 0:
+			faninfo[index] += "Auto"
+		else:
+			faninfo[index] += str(speeds[index])
+			faninfo[index] += "%"
+		#print(faninfo[index])
+	return faninfo