LXR linux/include/linux/usb/gpio

   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 */
  25struct gpio_vbus_mach_info {
  26        int gpio_vbus;
  27        int gpio_pullup;
  28        bool gpio_vbus_inverted;
  29        bool gpio_pullup_inverted;
  30};
  31