Fix units of current consumption value.

Previously it was not clear whether the units in tdehwlib are
in Wh and W or Ah and A. Now the units are always Ah and A.

Because power consumption is usually given in W, the value is
converted from A to W. If it is less than 100 W, it is
displayed as a decimal number.

This is related to issue TDE/tdelibs#68.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit fa0e4e246c)

src/detaileddialog.cpp

@@ -273,12 +273,17 @@ void detaileddialog::setPowerConsumption() {
 
 	// refresh battery collection
 	primaryBatteries = hwinfo->getPrimaryBatteries();
-	int rate = primaryBatteries->getCurrentRate();
+	double rate = primaryBatteries->getCurrentRate();
 
-	if (rate > 0 && !primaryBatteries->getChargeLevelUnit().isEmpty()) {	
+	if (rate > 0 && !primaryBatteries->getChargeLevelUnit().isEmpty()) {
 
 		TQString _val;
-		_val.setNum(rate);
+		if (rate > 100) {
+			_val = TQString("%L1").arg((int)rate);
+		}
+		else {
+			_val = TQString("%L1").arg(rate, 0, 'g', 3);
+		}
 		_val += " " + primaryBatteries->getChargeLevelUnit().remove('h');
 
 		tl_powerConsValue->setText(_val);

src/hardware_battery.cpp

@@ -94,7 +94,7 @@ void Battery::initDefault() {
 	state = BAT_NORM;
 	capacity_state = "ok";
 	charging_state = UNKNOWN_STATE;
-	charge_level_unit = "mWh";
+	charge_level_unit = "Ah";
 	charge_level_current = 0;
 	charge_level_lastfull = 0;
 	charge_level_percentage = 0;
@@ -461,16 +461,18 @@ bool Battery::checkChargeLevelRate () {
 		return false;
 	}
 
-	int _rate = present_rate;
+	double _rate = present_rate;
 
-	// FIXME VERIFY CORRECTNESS
-	// what does tdepowersave expect to see in present_rate (battery.charge_level.rate)?
-	present_rate = bdevice->dischargeRate();
+	// Note that the units used for charge_level_unit and present_rate_unit
+	// are different. This is intentionally because the battery charge
+	// values are in Ah while the power consumption is displayed in W.
+	present_rate = bdevice->dischargeRate()*bdevice->voltage();
 	if (present_rate < 0 )
 		present_rate = 0;
 
-	if (present_rate != _rate)
+	if (present_rate != _rate) {
 		emit changedBattery();
+	}
 
 	kdDebugFuncOut(trace);
 	return true;
@@ -839,7 +841,7 @@ int Battery::getRemainingMinutes() const {
 }
 
 //! current charging/discharging rate 
-int Battery::getPresentRate() const {
+double Battery::getPresentRate() const {
 	return present_rate;
 }
 

src/hardware_battery.h

@@ -162,7 +162,7 @@ private:
 	* second) the currently reported charging/discharging rate.
 	* \li a value >= 0
 	*/
-	int 	present_rate;
+	double 	present_rate;
 	//! Expected minutes unitl fully discharged/charged
 	/*!
 	* This int tells the current estimate until the battery is fully 
@@ -262,8 +262,8 @@ public:
 	int getState() const;
 	//! estimates the remaining minutes until fully charged/discharged
 	int getRemainingMinutes() const;
-	//! current charging/discharging rate 
-	int getPresentRate() const;
+	//! current charging/discharging rate
+	double getPresentRate() const;
 	//! maximum capacity of this battery by design
 	int getDesignCapacity() const;
 	//! current charging state as enum BAT_CHARG_STATE

src/hardware_batteryCollection.cpp

@@ -50,7 +50,7 @@ void BatteryCollection::initDefault() {
 
 	udis.clear();
 	
-	present_rate_unit = "mWh";
+	present_rate_unit = "W";
 
 	charging_state = UNKNOWN_STATE;
 	state = BAT_NORM;
@@ -79,7 +79,7 @@ bool BatteryCollection::refreshInfo(TQPtrList<Battery> BatteryList, bool force_l
 	int _percent = 0;
 	int _minutes = 0;
 	int _present_batteries = 0;
-	int _present_rate = 0;
+	double _present_rate = 0;
 
 	// for now: clean list before run update process!
 	udis.clear();
@@ -214,7 +214,7 @@ TQString BatteryCollection::getChargeLevelUnit() const {
 }
 
 //! get the current reported battery rate
-int BatteryCollection::getCurrentRate() const {
+double BatteryCollection::getCurrentRate() const {
 	return present_rate;
 }
 

src/hardware_batteryCollection.h

@@ -117,7 +117,7 @@ private:
 	* This int tells the current rate of the batteries
 	* \li a value >= 0
 	*/
-	int present_rate;
+	double present_rate;
 
 	//! charge_level in percent that will put battery into warning state
 	int warn_level;
@@ -184,7 +184,7 @@ public:
 	//! get the battery Type from enum \ref BAT_TYPE 
 	int getBatteryType() const;
 	//! get the current battery rate
-	int getCurrentRate() const;
+	double getCurrentRate() const;
 
 	//! reports the chargelevel in percent when battery goes to state warning
 	int getWarnLevel() const;