pda_power: Add optional OTG transceiver and voltage regulator support

This patch allows machines to use an OTG transceiver driver instead of
supplying a custom is_usb_online callback to check USB power.
Also, in the case that the OTG transceiver handles charger control when
connected to USB, a regulator named "ac_draw" can be supplied instead of
the custom set_charge callback to control the charger when connected to
AC.

The check for (transceiver->state == OTG_STATE_B_PERIPHERAL) in
otg_is_usb_online is probably too simple, I'm just using this with a
peripheral only device and gpio_vbus + bq24022. I'm not sure which other
OTG states can supply power.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

include/linux/pda_power.h

@@ -31,6 +31,8 @@ struct pda_power_pdata {
 	unsigned int wait_for_status; /* msecs, default is 500 */
 	unsigned int wait_for_charger; /* msecs, default is 500 */
 	unsigned int polling_interval; /* msecs, default is 2000 */
+
+	unsigned long ac_max_uA; /* current to draw when on AC */
 };
 
 #endif /* __PDA_POWER_H__ */