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 overridden 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 structure 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 59