Hello, I'm trying to enable battery charging on an OMAP4 board based on a twl6030 PMIC with external bq24190 battery charger and bq27510 fuel gauge.
The system has an OTG USB port that can be used to charge the battery, and that can also be used in host mode. In that case the bq24190 needs to be switched to boost mode to provide the +5V power supply from the battery. The bq24190 has a charge configuration register field that supports charge disabled, charge enabled and OTG (boost mode). The field is set by the bq24190 driver in response to setting the charge type : POWER_SUPPLY_CHARGE_TYPE_NONE will disable charing, and POWER_SUPPLY_CHARGE_TYPE_TRICKLE and POWER_SUPPLY_CHARGE_TYPE_FAST will enable it. However, OTG boost mode is not supported. The driver exposes most register fields as sysfs attributes (which doesn't sound very safe to me, but that's another story). I can thus enable OTG boost mode directly from userspace through the driver-specific API, but that just bypasses the power supply API. I'm thus not very fond of that solution. Possibly due to my really basic (not to say nonexistent) knowledge of the power supply subsystem I haven't found an API to expose this feature. I was wondering if someone had given a though regarding how to implement this properly. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
