power: bq27xxx: fix reading for bq27000 and bq27010

bug: the driver reports funny capacity values:

root@letux:/sys/class/power_supply/bq27000-battery# cat uevent
POWER_SUPPLY_NAME=bq27000-battery
POWER_SUPPLY_STATUS=Charging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_VOLTAGE_NOW=3702000
POWER_SUPPLY_CURRENT_NOW=-464635
POWER_SUPPLY_CAPACITY=1536			<- over 100% is magic
POWER_SUPPLY_CAPACITY_LEVEL=Normal
POWER_SUPPLY_TEMP=311
POWER_SUPPLY_TIME_TO_FULL_NOW=10440
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CHARGE_FULL=805450
POWER_SUPPLY_CHARGE_NOW=1068
POWER_SUPPLY_CHARGE_FULL_DESIGN=8844998	<- battery has just 1200 mAh
POWER_SUPPLY_CYCLE_COUNT=21
POWER_SUPPLY_ENERGY_NOW=0
POWER_SUPPLY_POWER_AVG=0
POWER_SUPPLY_HEALTH=Good
POWER_SUPPLY_MANUFACTURER=Texas Instruments

reason: the state of charge and the design capacity register are single
byte only. The design capacity returns the higer order byte.

tested: GTA04 with Openmoko/FIC HF08x battery (using hdq)

Fixes: d74534c27775 ("power: bq27xxx_battery: Add support for additional bq27xxx family devices")
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Acked-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

drivers/power/bq27xxx_battery.c

@@ -428,7 +428,10 @@ static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 {
 	int soc;
 
-	soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
+	if (di->chip == BQ27000 || di->chip == BQ27010)
+		soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
+	else
+		soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 
 	if (soc < 0)
 		dev_dbg(di->dev, "error reading State-of-Charge\n");
@@ -493,7 +496,10 @@ static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 {
 	int dcap;
 
-	dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
+	if (di->chip == BQ27000 || di->chip == BQ27010)
+		dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
+	else
+		dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 
 	if (dcap < 0) {
 		dev_dbg(di->dev, "error reading initial last measured discharge\n");
@@ -501,7 +507,7 @@ static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 	}
 
 	if (di->chip == BQ27000 || di->chip == BQ27010)
-		dcap *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
+		dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 	else
 		dcap *= 1000;