On Thu, May 07, 2015 at 03:38:50PM +0300, Laurentiu Palcu wrote: > Hi list, > > I'm working on a driver for a charger chip that also supports boost > mode (supply power on VBUS in order to charge other devices). However, > I'm not really sure what's the proper way to detect that we're in host > mode or device mode in order to switch boost mode on. > > I saw some charger drivers register a notifier with the usb_phy and > check for USB_EVENT_ID event. According to OTG specifications, if the ID > pin is grounded the initial role should be host mode. But, not all USB > PHY drivers throw this event. In fact, I only found one driver that does > that: omap2430.c. > > Is there a more robust/generic way?
that should be the correct event to listen to, at least as of now. USB Charging in Linux hasn't seen a lot of love lately, I'm afraid. -- balbi
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