On 3/3/2011 3:15 PM, Felipe Balbi wrote: > On Thu, Mar 03, 2011 at 02:22:34PM +0530, Pavan Kondeti wrote: >> Hi >> >> I am adding ACA (Accessory Charger Adapter) detection support for MSM >> OTG driver. Battery charging spec introduced ACA to facilitate charging >> when acting as a host. The host does not have to supply power on VBUS >> when ACA is connected. Host device can also draw some amount of current. >> The amount of current is determined by subtracting the attached >> peripheral current requirement from the charger rating current. I am >> looking for a way to find out the attached peripheral's current >> requirement. We already DEVICE_ADD and DEVICE_REMOVE notifications. But > > bMaxPower from the device descriptor ?? > You are referring to bMaxPower in Configuration descriptor right? When a multi configuration device is connected, configuration can be changed by user at any time. The same can also be possible with a user claimed port. So I am looking for a notification from USB core when a SET_CONFIGURATION request is sent to a device connected on the root hub. I will reduce my power (ACA rating current - bMaxpower of the config being selected) upon this notification. Thanks, Pavan -- Sent by a consultant of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
