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Diffstat (limited to 'kernel/include/linux/input/mt.h')
| -rw-r--r-- | kernel/include/linux/input/mt.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/kernel/include/linux/input/mt.h b/kernel/include/linux/input/mt.h new file mode 100644 index 000000000..d7188de4d --- /dev/null +++ b/kernel/include/linux/input/mt.h @@ -0,0 +1,127 @@ +#ifndef _INPUT_MT_H +#define _INPUT_MT_H + +/* + * Input Multitouch Library + * + * Copyright (c) 2010 Henrik Rydberg + * + * 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> + +#define TRKID_MAX 0xffff + +#define INPUT_MT_POINTER 0x0001 /* pointer device, e.g. trackpad */ +#define INPUT_MT_DIRECT 0x0002 /* direct device, e.g. touchscreen */ +#define INPUT_MT_DROP_UNUSED 0x0004 /* drop contacts not seen in frame */ +#define INPUT_MT_TRACK 0x0008 /* use in-kernel tracking */ +#define INPUT_MT_SEMI_MT 0x0010 /* semi-mt device, finger count handled manually */ + +/** + * struct input_mt_slot - represents the state of an input MT slot + * @abs: holds current values of ABS_MT axes for this slot + * @frame: last frame at which input_mt_report_slot_state() was called + * @key: optional driver designation of this slot + */ +struct input_mt_slot { + int abs[ABS_MT_LAST - ABS_MT_FIRST + 1]; + unsigned int frame; + unsigned int key; +}; + +/** + * struct input_mt - state of tracked contacts + * @trkid: stores MT tracking ID for the next contact + * @num_slots: number of MT slots the device uses + * @slot: MT slot currently being transmitted + * @flags: input_mt operation flags + * @frame: increases every time input_mt_sync_frame() is called + * @red: reduced cost matrix for in-kernel tracking + * @slots: array of slots holding current values of tracked contacts + */ +struct input_mt { + int trkid; + int num_slots; + int slot; + unsigned int flags; + unsigned int frame; + int *red; + struct input_mt_slot slots[]; +}; + +static inline void input_mt_set_value(struct input_mt_slot *slot, + unsigned code, int value) +{ + slot->abs[code - ABS_MT_FIRST] = value; +} + +static inline int input_mt_get_value(const struct input_mt_slot *slot, + unsigned code) +{ + return slot->abs[code - ABS_MT_FIRST]; +} + +static inline bool input_mt_is_active(const struct input_mt_slot *slot) +{ + return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0; +} + +static inline bool input_mt_is_used(const struct input_mt *mt, + const struct input_mt_slot *slot) +{ + return slot->frame == mt->frame; +} + +int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots, + unsigned int flags); +void input_mt_destroy_slots(struct input_dev *dev); + +static inline int input_mt_new_trkid(struct input_mt *mt) +{ + return mt->trkid++ & TRKID_MAX; +} + +static inline void input_mt_slot(struct input_dev *dev, int slot) +{ + input_event(dev, EV_ABS, ABS_MT_SLOT, slot); +} + +static inline bool input_is_mt_value(int axis) +{ + return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST; +} + +static inline bool input_is_mt_axis(int axis) +{ + return axis == ABS_MT_SLOT || input_is_mt_value(axis); +} + +void input_mt_report_slot_state(struct input_dev *dev, + unsigned int tool_type, bool active); + +void input_mt_report_finger_count(struct input_dev *dev, int count); +void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count); +void input_mt_drop_unused(struct input_dev *dev); + +void input_mt_sync_frame(struct input_dev *dev); + +/** + * struct input_mt_pos - contact position + * @x: horizontal coordinate + * @y: vertical coordinate + */ +struct input_mt_pos { + s16 x, y; +}; + +int input_mt_assign_slots(struct input_dev *dev, int *slots, + const struct input_mt_pos *pos, int num_pos, + int dmax); + +int input_mt_get_slot_by_key(struct input_dev *dev, int key); + +#endif |