cpu plugin: add EEEPC dynamic FSB reclocking

The Asus FSB reclocking feature is also known as Super Hybrid Engine (SHE).
The feature can be enabled in tuned.conf by setting the eeefsb to True.
It is enabled by default in the laptop-battery-powersave profile.

Signed-off-by: Jan Vcelak <jvcelak@redhat.com>

tune-profiles/laptop-battery-powersave/ktune.sh

@@ -10,7 +10,6 @@ start() {
 	enable_snd_ac97_powersave
 	disable_cd_polling
 	enable_wifi_powersave
-	eee_set_reduced_fsb
 
 	return 0
 }
@@ -23,7 +22,6 @@ stop() {
 	enable_snd_ac97_powersave
 	enable_cd_polling
 	disable_wifi_powersave
-	eee_set_normal_fsb
 
 	return 0
 }

tune-profiles/laptop-battery-powersave/tuned.conf

@@ -55,3 +55,4 @@
 # Enabled or disable the plugin. Default is True. Any other value
 # disables it.
 # enabled=False
+eeefsb=True

tuningplugins/cpu.py

@@ -25,10 +25,15 @@ class CPUTuning:
 
 	config_section = "CPUTuning"
 
+	eeefsb_control = "/sys/devices/platform/eeepc/cpufv"
+
 	def __init__(self):
 		self.latency = 100
 		self.enabled = True
 
+		self.eeefsb = False
+		self.fsbreduced = False
+
 	def init(self, config):
 		log.debug("Init")
 
@@ -40,6 +45,13 @@ class CPUTuning:
 		except:
 			self.enabled = False
 
+		if self.config.has_option(self.config_section, "eeefsb"):
+                        self.eeefsb = (self.config.get(self.config_section, "eeefsb") == "True")
+		try:
+			open(self.eeefsb_control, "w")
+		except:
+			self.eeefsb = False
+
 		log.info("Module is %s" % ("enabled" if self.enabled else "disabled"))
 
 	def cleanup(self):
@@ -60,5 +72,12 @@ class CPUTuning:
 			log.debug("Setting latency to 100")
 			self.latency = 100
 			open("/dev/cpu_dma_latency", "w").write("100\n")
+		if self.eeefsb:
+			if not self.fsbreduced and loadavg < 0.4:
+				open(self.eeefsb_control, "w").write("2\n")
+				self.fsbreduced = True
+			if self.fsbreduced and loadavg > 0.5:
+				open(self.eeefsb_control, "w").write("1\n")
+				self.fsbreduced = False
 
 _plugin = CPUTuning()