#ifndef _INPUT_POLLDEV_H
  #define _INPUT_POLLDEV_H
  
  /*
   * Copyright (c) 2007 Dmitry Torokhov
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   */
  
  #include <linux/input.h>
  #include <linux/workqueue.h>
  
  /**
   * struct input_polled_dev - simple polled input device

   * @private: private driver data.
   * @open: driver-supplied method that prepares device for polling
   *	(enabled the device and maybe flushes device state).
   * @close: driver-supplied method that is called when device is no
   *	longer being polled. Used to put device into low power mode.

   * @poll: driver-supplied method that polls the device and posts
   *	input events (mandatory).

   * @poll_interval: specifies how often the poll() method should be called.

   *	Defaults to 500 msec unless overridden when registering the device.

   * @poll_interval_max: specifies upper bound for the poll interval.
   *	Defaults to the initial value of @poll_interval.
   * @poll_interval_min: specifies lower bound for the poll interval.
   *	Defaults to 0.

   * @input: input device structure associated with the polled device.

   *	Must be properly initialized by the driver (id, name, phys, bits).
   *
   * Polled input device provides a skeleton for supporting simple input
   * devices that do not raise interrupts but have to be periodically
   * scanned or polled to detect changes in their state.
   */
  struct input_polled_dev {
  	void *private;

  	void (*open)(struct input_polled_dev *dev);
  	void (*close)(struct input_polled_dev *dev);

  	void (*poll)(struct input_polled_dev *dev);
  	unsigned int poll_interval; /* msec */

  	unsigned int poll_interval_max; /* msec */
  	unsigned int poll_interval_min; /* msec */

  
  	struct input_dev *input;

  
  /* private: */

  	struct delayed_work work;
  };
  
  struct input_polled_dev *input_allocate_polled_device(void);
  void input_free_polled_device(struct input_polled_dev *dev);
  int input_register_polled_device(struct input_polled_dev *dev);
  void input_unregister_polled_device(struct input_polled_dev *dev);
  
  #endif