Hi, Warning newbie questions and I'm hoping I'm on the right list :-) I'm trying to implement charging logic for a device. As these are my first steps into the kernel I'd like to solicit opinions in which way to proceed. Hardware: Qisda ebook-reader family - essentially every machine with an epaper display from Sipix build around a s3c2416. Charger IC is a Texas Instruments bq24075 connected via gpios. The manufacturers used a fork of 2.6.21.5 and we try to make a current kernel usable on the devices. Somewhere on lkml I read that reimplementing basic charger logic in yet another driver is not desired, so I'm looking at using the pda-power driver in combination with a simple bq2407x regulator driver based on Philipp Zabels driver for the bq24022. The usb gadget driver has not OTG functionality and vbus detection is done via a special gpio. So it seems the gpio-vbus driver seems to be the driver to use for this. Questions: It's possible to connect the devices usb port to either a normal usb host or a dedicated charger with higher current. The current charger type is read from some usb registers. So my question would be on how to model this with pda- power. The ac-part is propably not usable for this as it seems to require a different gpio-source. Is implementing some sort of "is_usb_aca"-hook a possible way The charger also reports its charging status via a gpio. What's the best way to implement this with pda-power? My current idea is to add an is_charging or supply_status hook to pda-power and if defined output this value via the get_property method and POWER_SUPPLY_STATUS_*. Correct? Or as a complete alternative is it more reasonable to implement a new power- supply for this and not add more switches to pda-power? For example the pcf56033-charger driver has exactly this functionality but for a specific device. As nowadays most of the devices only have an usb port but different charging sources for it, is it reasonable to build some sort of generic "gadget-power" driver analogous to pda-power or does something of this sort exist? Thanks for any input :-) Heiko _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
