release/src-rt-6.x.4708/linux/linux-2.6.36/include/linux/usb/gpio_vbus.h

   1 /*
   2  * A simple GPIO VBUS sensing driver for B peripheral only devices
   3  * with internal transceivers.
   4  * Optionally D+ pullup can be controlled by a second GPIO.
   5  *
   6  * Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 /**
  15  * struct gpio_vbus_mach_info - configuration for gpio_vbus
  16  * @gpio_vbus: VBUS sensing GPIO
  17  * @gpio_pullup: optional D+ or D- pullup GPIO (else negative/invalid)
  18  * @gpio_vbus_inverted: true if gpio_vbus is active low
  19  * @gpio_pullup_inverted: true if gpio_pullup is active low
  20  *
  21  * The VBUS sensing GPIO should have a pulldown, which will normally be
  22  * part of a resistor ladder turning a 4.0V-5.25V level on VBUS into a
  23  * value the GPIO detects as active.  Some systems will use comparators.
  24  */
  25 struct gpio_vbus_mach_info {
  26         int gpio_vbus;
  27         int gpio_pullup;
  28         bool gpio_vbus_inverted;
  29         bool gpio_pullup_inverted;
  30 };