5 * Input Multitouch Library
7 * Copyright (c) 2010 Henrik Rydberg
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published by
11 * the Free Software Foundation.
14 #include <linux/input.h>
16 #define TRKID_MAX 0xffff
19 * struct input_mt_slot - represents the state of an input MT slot
20 * @abs: holds current values of ABS_MT axes for this slot
22 struct input_mt_slot {
23 int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
27 * struct input_mt - state of tracked contacts
28 * @trkid: stores MT tracking ID for the next contact
29 * @num_slots: number of MT slots the device uses
30 * @slot: MT slot currently being transmitted
31 * @slots: array of slots holding current values of tracked contacts
37 struct input_mt_slot slots[];
40 static inline void input_mt_set_value(struct input_mt_slot *slot,
41 unsigned code, int value)
43 slot->abs[code - ABS_MT_FIRST] = value;
46 static inline int input_mt_get_value(const struct input_mt_slot *slot,
49 return slot->abs[code - ABS_MT_FIRST];
52 int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots);
53 void input_mt_destroy_slots(struct input_dev *dev);
55 static inline int input_mt_new_trkid(struct input_mt *mt)
57 return mt->trkid++ & TRKID_MAX;
60 static inline void input_mt_slot(struct input_dev *dev, int slot)
62 input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
65 static inline bool input_is_mt_value(int axis)
67 return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
70 static inline bool input_is_mt_axis(int axis)
72 return axis == ABS_MT_SLOT || input_is_mt_value(axis);
75 void input_mt_report_slot_state(struct input_dev *dev,
76 unsigned int tool_type, bool active);
78 void input_mt_report_finger_count(struct input_dev *dev, int count);
79 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);