pda_power: add support for using otg transceiver events

If the platform data sets the use_otg_notifier flag,
the driver will now register an otg notifier callback and listen
to transceiver events for AC/USB plug-in events instead. This would
normally be used by not specifying is_xx_online callbacks and
not specifying any irqs so the state machine is completely driven
from OTG xceiver events.

Change-Id: Ic4b3bc4010f299156e41fd2411696c7ff5a88e92
Signed-off-by: Dima Zavin <dima@android.com>

include/linux/pda_power.h

@@ -35,6 +35,8 @@ struct pda_power_pdata {
 	unsigned int polling_interval; /* msecs, default is 2000 */
 
 	unsigned long ac_max_uA; /* current to draw when on AC */
+
+	bool use_otg_notifier;
 };
 
 #endif /* __PDA_POWER_H__ */