include/linux/input-polldev.h

   1 #ifndef _INPUT_POLLDEV_H
   2 #define _INPUT_POLLDEV_H
   3
   4 /*
   5  * Copyright (c) 2007 Dmitry Torokhov
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  */
  11
  12 #include <linux/input.h>
  13 #include <linux/workqueue.h>
  14
  15 /**
  16  * struct input_polled_dev - simple polled input device
  17  * @private: private driver data.
  18  * @open: driver-supplied method that prepares device for polling
  19  *      (enabled the device and maybe flushes device state).
  20  * @close: driver-supplied method that is called when device is no
  21  *      longer being polled. Used to put device into low power mode.
  22  * @poll: driver-supplied method that polls the device and posts
  23  *      input events (mandatory).
  24  * @poll_interval: specifies how often the poll() method should be called.
  25  *      Defaults to 500 msec unless overriden when registering the device.
  26  * @poll_interval_max: specifies upper bound for the poll interval.
  27  *      Defaults to the initial value of @poll_interval.
  28  * @poll_interval_min: specifies lower bound for the poll interval.
  29  *      Defaults to 0.
  30  * @input: input device structire associated with the polled device.
  31  *      Must be properly initialized by the driver (id, name, phys, bits).
  32  *
  33  * Polled input device provides a skeleton for supporting simple input
  34  * devices that do not raise interrupts but have to be periodically
  35  * scanned or polled to detect changes in their state.
  36  */
  37 struct input_polled_dev {
  38         void *private;
  39
  40         void (*open)(struct input_polled_dev *dev);
  41         void (*close)(struct input_polled_dev *dev);
  42         void (*poll)(struct input_polled_dev *dev);
  43         unsigned int poll_interval; /* msec */
  44         unsigned int poll_interval_max; /* msec */
  45         unsigned int poll_interval_min; /* msec */
  46
  47         struct input_dev *input;
  48
  49 /* private: */
  50         struct delayed_work work;
  51 };
  52
  53 struct input_polled_dev *input_allocate_polled_device(void);
  54 void input_free_polled_device(struct input_polled_dev *dev);
  55 int input_register_polled_device(struct input_polled_dev *dev);
  56 void input_unregister_polled_device(struct input_polled_dev *dev);
  57
  58 #endif