USB_GADGET_VBUS_DRAW(9) Kernel Mode Gadget API USB_GADGET_VBUS_DRAW(9)
NAME
usb_gadget_vbus_draw - constrain controller's VBUS power usage
SYNOPSIS
int usb_gadget_vbus_draw(struct usb_gadget * gadget, unsigned mA);
ARGUMENTS
gadget
The device whose VBUS usage is being described
mA
How much current to draw, in milliAmperes. This should be twice the value listed in the configuration descriptor bMaxPower field.
DESCRIPTION
This call is used by gadget drivers during SET_CONFIGURATION calls, reporting how much power the device may consume. For example, this
could affect how quickly batteries are recharged.
Returns zero on success, else negative errno.
AUTHOR
David Brownell <dbrownell@users.sourceforge.net>
Author.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 USB_GADGET_VBUS_DRAW(9)
