2 * Copyright © 2013 Jonas Ådahl
4 * Permission to use, copy, modify, distribute, and sell this software and
5 * its documentation for any purpose is hereby granted without fee, provided
6 * that the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation, and that the name of the copyright holders not be used in
9 * advertising or publicity pertaining to distribution of the software
10 * without specific, written prior permission. The copyright holders make
11 * no representations about the suitability of this software for any
12 * purpose. It is provided "as is" without express or implied warranty.
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
15 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
16 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
17 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
18 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
19 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
32 * libinput is a generic input device handling library. It abstracts
33 * commonly-used concepts such as keyboard, pointer and touchpad handling
38 * @ingroup fixed_point
40 * libinput 24.8 fixed point real number.
42 typedef int32_t li_fixed_t;
47 * Capabilities on a device. A device may have one or more capabilities
48 * at a time, and capabilities may appear or disappear during the
49 * lifteime of the device.
51 enum libinput_device_capability {
52 LIBINPUT_DEVICE_CAP_KEYBOARD = 0,
53 LIBINPUT_DEVICE_CAP_POINTER = 1,
54 LIBINPUT_DEVICE_CAP_TOUCH = 2
60 * Logical state of a key. Note that the logical state may not represent
61 * the physical state of the key.
63 enum libinput_keyboard_key_state {
64 LIBINPUT_KEYBOARD_KEY_STATE_RELEASED = 0,
65 LIBINPUT_KEYBOARD_KEY_STATE_PRESSED = 1
71 * Mask reflecting LEDs on a device.
74 LIBINPUT_LED_NUM_LOCK = (1 << 0),
75 LIBINPUT_LED_CAPS_LOCK = (1 << 1),
76 LIBINPUT_LED_SCROLL_LOCK = (1 << 2)
82 * Logical state of a physical button. Note that the logical state may not
83 * represent the physical state of the button.
85 enum libinput_pointer_button_state {
86 LIBINPUT_POINTER_BUTTON_STATE_RELEASED = 0,
87 LIBINPUT_POINTER_BUTTON_STATE_PRESSED = 1
94 * Axes on a device that are not x or y coordinates.
96 enum libinput_pointer_axis {
97 LIBINPUT_POINTER_AXIS_VERTICAL_SCROLL = 0,
98 LIBINPUT_POINTER_AXIS_HORIZONTAL_SCROLL = 1
104 * Logical touch state of a touch point. A touch point usually follows the
105 * sequence down, motion, up, with the number of motion events being zero or
106 * greater. If a touch point was used for gesture interpretation internally
107 * and will not generate any further events, the touchpoint is cancelled.
109 * A frame event is set after a set of touchpoints that constitute one
110 * logical set of points at a sampling point.
112 enum libinput_touch_type {
113 LIBINPUT_TOUCH_TYPE_DOWN = 0,
114 LIBINPUT_TOUCH_TYPE_UP = 1,
115 LIBINPUT_TOUCH_TYPE_MOTION = 2,
116 LIBINPUT_TOUCH_TYPE_FRAME = 3,
117 LIBINPUT_TOUCH_TYPE_CANCEL = 4
123 * Event type for events returned by libinput_get_event().
125 enum libinput_event_type {
126 LIBINPUT_EVENT_NONE = 0,
127 LIBINPUT_EVENT_DEVICE_ADDED,
128 LIBINPUT_EVENT_DEVICE_REMOVED,
130 LIBINPUT_EVENT_KEYBOARD_KEY = 300,
132 LIBINPUT_EVENT_POINTER_MOTION = 400,
133 LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
134 LIBINPUT_EVENT_POINTER_BUTTON,
135 LIBINPUT_EVENT_POINTER_AXIS,
137 LIBINPUT_EVENT_TOUCH_TOUCH = 500
141 struct libinput_device;
142 struct libinput_seat;
144 struct libinput_event;
145 struct libinput_event_device_notify;
146 struct libinput_event_keyboard;
147 struct libinput_event_pointer;
148 struct libinput_event_touch;
151 * @defgroup fixed_point Fixed point utilities
155 * @ingroup fixed_point
157 * Convert li_fixed_t to a double
159 * @param f fixed point number
160 * @return Converted double
163 li_fixed_to_double (li_fixed_t f)
170 u.i = ((1023LL + 44LL) << 52) + (1LL << 51) + f;
172 return u.d - (3LL << 43);
176 * @ingroup fixed_point
178 * Convert li_fixed_t to a int. The fraction part is discarded.
180 * @param f fixed point number
181 * @return Converted int
184 li_fixed_to_int(li_fixed_t f)
190 * @defgroup event Acessing and destruction of events
198 * @param event An event retrieved by libinput_get_event().
201 libinput_event_destroy(struct libinput_event *event);
206 * Get the type of the event.
208 * @param event An event retrieved by libinput_get_event().
210 enum libinput_event_type
211 libinput_event_get_type(struct libinput_event *event);
216 * Get the libinput context from the event.
218 * @param event The libinput event
219 * @return The libinput context for this event.
222 libinput_event_get_context(struct libinput_event *event);
227 * Return the device associated with this event, if applicable. For device
228 * added/removed events this is the device added or removed. For all other
229 * device events, this is the device that generated the event.
231 * This device is not refcounted and its lifetime is that of the event. Use
232 * libinput_device_ref() before using the device outside of this scope.
234 * @return The device associated with this event
237 struct libinput_device*
238 libinput_event_get_device(struct libinput_event *event);
243 * Return the pointer event that is this input event. If the event type does
244 * not match the pointer event types, this function returns NULL.
246 * @return A pointer event, or NULL for other events
248 struct libinput_event_pointer*
249 libinput_event_get_pointer_event(struct libinput_event *event);
254 * Return the keyboard event that is this input event. If the event type does
255 * not match the keyboard event types, this function returns NULL.
257 * @return A keyboard event, or NULL for other events
259 struct libinput_event_keyboard*
260 libinput_event_get_keyboard_event(struct libinput_event *event);
265 * Return the touch event that is this input event. If the event type does
266 * not match the touch event types, this function returns NULL.
268 * @return A touch event, or NULL for other events
270 struct libinput_event_touch*
271 libinput_event_get_touch_event(struct libinput_event *event);
276 * Return the device event that is this input event. If the event type does
277 * not match the device event types, this function returns NULL.
279 * @return A device event, or NULL for other events
281 struct libinput_event_device_notify*
282 libinput_event_get_device_notify_event(struct libinput_event *event);
285 * @defgroup event_keyboard Keyboard events
287 * Key events are generated when a key changes its logical state, usually by
288 * being pressed or released.
292 * @ingroup event_keyboard
294 * @return The event time for this event
297 libinput_event_keyboard_get_time(
298 struct libinput_event_keyboard *event);
301 * @ingroup event_keyboard
303 * @return The keycode that triggered this key event
306 libinput_event_keyboard_get_key(
307 struct libinput_event_keyboard *event);
310 * @ingroup event_keyboard
312 * @return The state change of the key
314 enum libinput_keyboard_key_state
315 libinput_event_keyboard_get_key_state(
316 struct libinput_event_keyboard *event);
319 * @defgroup event_pointer Pointer events
321 * Pointer events reflect motion, button and scroll events, as well as
322 * events from other axes.
326 * @ingroup event_pointer
328 * @return The event time for this event
331 libinput_event_pointer_get_time(
332 struct libinput_event_pointer *event);
335 * @ingroup event_pointer
337 * Return the delta between the last event and the current event. The axis'
338 * positive direction is device-specific. For pointer events that are
339 * not of type LIBINPUT_EVENT_POINTER_MOTION, this function returns 0.
341 * @note It is an application bug to call this function for events other than
342 * LIBINPUT_EVENT_POINTER_MOTION.
344 * @return the relative x movement since the last event
347 libinput_event_pointer_get_dx(
348 struct libinput_event_pointer *event);
351 * @ingroup event_pointer
353 * Return the delta between the last event and the current event. The
354 * axis' positive direction is device-specific. For pointer events that are
355 * not of type LIBINPUT_EVENT_POINTER_MOTION, this function returns 0.
357 * @note It is an application bug to call this function for events other than
358 * LIBINPUT_EVENT_POINTER_MOTION.
360 * @return the relative y movement since the last event
363 libinput_event_pointer_get_dy(
364 struct libinput_event_pointer *event);
367 * @ingroup event_pointer
369 * Return the absolute x coordinate of the device, scaled to screen
371 * The axes' positive direction is device-specific. For pointer events that
372 * are not of type LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE, this function
375 * @note It is an application bug to call this function for events other than
376 * LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE.
378 * @return the current absolute x coordinate scaled to screen coordinates.
381 libinput_event_pointer_get_absolute_x(
382 struct libinput_event_pointer *event);
385 * @ingroup event_pointer
387 * Return the absolute y coordinate of the device, scaled to screen coordinates.
388 * The axes' positive direction is device-specific. For pointer events that
389 * are not of type LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE, this function
392 * @note It is an application bug to call this function for events other than
393 * LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE.
395 * @return the current absolute y coordinate scaled to screen coordinates.
398 libinput_event_pointer_get_absolute_y(
399 struct libinput_event_pointer *event);
402 * @ingroup event_pointer
404 * Return the button that triggered this event.
405 * For pointer events that are not of type LIBINPUT_EVENT_POINTER_BUTTON,
406 * this function returns 0.
408 * @note It is an application bug to call this function for events other than
409 * LIBINPUT_EVENT_POINTER_BUTTON.
411 * @return the button triggering this event
414 libinput_event_pointer_get_button(
415 struct libinput_event_pointer *event);
418 * @ingroup event_pointer
420 * Return the button state that triggered this event.
421 * For pointer events that are not of type LIBINPUT_EVENT_POINTER_BUTTON,
422 * this function returns 0.
424 * @note It is an application bug to call this function for events other than
425 * LIBINPUT_EVENT_POINTER_BUTTON.
427 * @return the button state triggering this event
429 enum libinput_pointer_button_state
430 libinput_event_pointer_get_button_state(
431 struct libinput_event_pointer *event);
434 * @ingroup event_pointer
436 * Return the axis that triggered this event.
437 * For pointer events that are not of type LIBINPUT_EVENT_POINTER_AXIS,
438 * this function returns 0.
440 * @note It is an application bug to call this function for events other than
441 * LIBINPUT_EVENT_POINTER_AXIS.
443 * @return the axis triggering this event
445 enum libinput_pointer_axis
446 libinput_event_pointer_get_axis(
447 struct libinput_event_pointer *event);
450 * @ingroup event_pointer
452 * Return the axis value of the given axis. The interpretation of the value
453 * is dependent on the axis. For the two scrolling axes
454 * LIBINPUT_POINTER_AXIS_VERTICAL_SCROLL and
455 * LIBINPUT_POINTER_AXIS_HORIZONTAL_SCROLL, the value of the event is in
456 * relative scroll units, with the positive direction being down or right,
457 * respectively. The dimension of a scroll unit is equal to one unit of
458 * motion in the respective axis, where applicable (e.g. touchpad two-finger
461 * For pointer events that are not of type LIBINPUT_EVENT_POINTER_AXIS,
462 * this function returns 0.
464 * @note It is an application bug to call this function for events other than
465 * LIBINPUT_EVENT_POINTER_AXIS.
467 * @return the axis value of this event
470 libinput_event_pointer_get_axis_value(
471 struct libinput_event_pointer *event);
474 * @defgroup event_touch Touch events
476 * Events from absolute touch devices.
480 * @ingroup event_touch
482 * @return The event time for this event
485 libinput_event_touch_get_time(
486 struct libinput_event_touch *event);
489 * @ingroup event_touch
491 * Get the currently active slot on this device. See the kernel's multitouch
492 * protocol B documentation for more information.
494 * @return The currently active slot on this multitouch device
497 libinput_event_touch_get_slot(
498 struct libinput_event_touch *event);
501 * @ingroup event_touch
503 * @return the absolute X coordinate on this touch device, scaled to screen coordinates.
506 libinput_event_touch_get_x(
507 struct libinput_event_touch *event);
510 * @ingroup event_touch
512 * @return the absolute X coordinate on this touch device, scaled to screen coordinates.
515 libinput_event_touch_get_y(
516 struct libinput_event_touch *event);
519 * @ingroup event_touch
521 * @return the type of touch that occured on the device
523 enum libinput_touch_type
524 libinput_event_touch_get_touch_type(
525 struct libinput_event_touch *event);
528 * @defgroup base Initialization and manipulation of libinput contexts
531 struct libinput_interface {
533 * Open the device at the given path with the flags provided and
536 * @param path The device path to open
537 * @param flags Flags as defined by open(2)
538 * @param user_data The user_data provided in
539 * libinput_create_from_udev()
541 * @return the file descriptor, or a negative errno on failure.
543 int (*open_restricted)(const char *path, int flags, void *user_data);
545 * Close the file descriptor.
547 * @param fd The file descriptor to close
548 * @param user_data The user_data provided in
549 * libinput_create_from_udev()
551 void (*close_restricted)(int fd, void *user_data);
553 void (*get_current_screen_dimensions)(struct libinput_device *device,
562 * Create a new libinput context from udev, for input devices matching
563 * the given seat ID. New devices or devices removed will appear as events
564 * during libinput_dispatch.
566 * @param interface The callback interface
567 * @param user_data Caller-specific data passed to the various callback
569 * @param udev An already initialized udev context
570 * @param seat_id A seat identifier. This string must not be NULL.
572 * @return An initialized libinput context, ready to handle events or NULL on
576 libinput_create_from_udev(const struct libinput_interface *interface,
579 const char *seat_id);
583 * Create a new libinput context from the given path. This context
584 * represents one single device only, it will not respond to new devices
585 * being added and reading from the device after it was removed will fail.
587 * @param interface The callback interface
588 * @param user_data Caller-specific data passed to the various callback
590 * @param path Path to an input device
592 * @return An initialized libinput context, ready to handle events or NULL on
596 libinput_create_from_path(const struct libinput_interface *interface,
603 * libinput keeps a single file descriptor for all events. Call into
604 * libinput_dispatch() if any events become available on this fd.
606 * @return the file descriptor used to notify of pending events.
609 libinput_get_fd(struct libinput *libinput);
614 * Main event dispatchment function. Reads events of the file descriptors
615 * and processes them internally. Use libinput_get_event() to retrieve the
618 * Dispatching does not necessarily queue libinput events.
620 * @param libinput A previously initialized libinput context
622 * @return 0 on success, or a negative errno on failure
625 libinput_dispatch(struct libinput *libinput);
630 * Retrieve the next event from libinput's internal event queue.
632 * After handling the retrieved event, the caller must destroy it using
633 * libinput_event_destroy().
635 * @param libinput A previously initialized libinput context
636 * @return The next available event, or NULL if no event is available.
638 struct libinput_event *
639 libinput_get_event(struct libinput *libinput);
644 * Return the type of the next event in the internal queue. This function
645 * does not pop the event off the queue and the next call to
646 * libinput_get_event() returns that event.
648 * @param libinput A previously initialized libinput context
649 * @return The event type of the next available event or LIBINPUT_EVENT_NONE
650 * if no event is availble.
652 enum libinput_event_type
653 libinput_next_event_type(struct libinput *libinput);
658 * @param libinput A previously initialized libinput context
659 * @return the caller-specific data previously assigned in
660 * libinput_create_udev().
663 libinput_get_user_data(struct libinput *libinput);
668 * Resume a suspended libinput context. This re-enables device
669 * monitoring and adds existing devices.
671 * @param libinput A previously initialized libinput context
672 * @see libinput_suspend
674 * @return 0 on success or -1 on failure
677 libinput_resume(struct libinput *libinput);
682 * Suspend monitoring for new devices and close existing devices.
683 * This all but terminates libinput but does keep the context
684 * valid to be resumed with libinput_resume().
686 * @param libinput A previously initialized libinput context
689 libinput_suspend(struct libinput *libinput);
694 * Destroy the libinput context. After this, object references associated with
695 * the destroyed context are invalid and may not be interacted with.
697 * @param libinput A previously initialized libinput context
700 libinput_destroy(struct libinput *libinput);
703 * @defgroup seat Initialization and manipulation of seats
705 * A seat has two identifiers, the physical name and the logical name. The
706 * physical name is summarized as the list of devices a process on the same
707 * physical seat has access to.
709 * The logical seat name is the seat name for a logical group of devices. A
710 * compositor may use that to create additonal seats as independent device
711 * sets. Alternatively, a compositor may limit itself to a single logical
712 * seat, leaving a second compositor to manage devices on the other logical
716 * +---+--------+------------+------------------------+------------+
717 * | | event0 | | | log seat A |
718 * | K +--------+ | +------------+
719 * | e | event1 | phys seat0 | libinput context 1 | |
720 * | r +--------+ | | log seat B |
721 * | n | event2 | | | |
722 * | e +--------+------------+------------------------+------------+
723 * | l | event3 | phys seat1 | libinput context 2 | log seat C |
724 * +---+--------+------------+------------------------+------------+
731 * Increase the refcount of the seat. A seat will be freed whenever the
732 * refcount reaches 0. This may happen during dispatch if the
733 * seat was removed from the system. A caller must ensure to reference
734 * the seat correctly to avoid dangling pointers.
736 * @param seat A previously obtained seat
739 libinput_seat_ref(struct libinput_seat *seat);
744 * Decrease the refcount of the seat. A seat will be freed whenever the
745 * refcount reaches 0. This may happen during dispatch if the
746 * seat was removed from the system. A caller must ensure to reference
747 * the seat correctly to avoid dangling pointers.
749 * @param seat A previously obtained seat
752 libinput_seat_unref(struct libinput_seat *seat);
757 * Set caller-specific data associated with this seat. libinput does
758 * not manage, look at, or modify this data. The caller must ensure the
761 * @param seat A previously obtained seat
762 * @param user_data Caller-specific data pointer
763 * @see libinput_seat_get_user_data
766 libinput_seat_set_user_data(struct libinput_seat *seat, void *user_data);
771 * Get the caller-specific data associated with this seat, if any.
773 * @param seat A previously obtained seat
774 * @return Caller-specific data pointer or NULL if none was set
775 * @see libinput_seat_set_user_data
778 libinput_seat_get_user_data(struct libinput_seat *seat);
783 * Return the physical name of the seat. For libinput contexts created from
784 * udev, this is always the same value as passed into
785 * libinput_create_from_udev() and all seats from that context will have the
786 * same physical name.
788 * The physical name of the seat is one that is usually set by the system or
789 * lower levels of the stack. In most cases, this is the base filter for
790 * devices - devices assigned to seats outside the current seat will not
791 * be available to the caller.
793 * @param seat A previously obtained seat
794 * @return the physical name of this seat
797 libinput_seat_get_physical_name(struct libinput_seat *seat);
802 * Return the logical name of the seat. This is an identifier to group sets
803 * of devices within the compositor.
805 * @param seat A previously obtained seat
806 * @return the logical name of this seat
809 libinput_seat_get_logical_name(struct libinput_seat *seat);
812 * @defgroup device Initialization and manipulation of input devices
818 * Increase the refcount of the input device. An input device will be freed
819 * whenever the refcount reaches 0. This may happen during dispatch if the
820 * device was removed from the system. A caller must ensure to reference
821 * the device correctly to avoid dangling pointers.
823 * @param device A previously obtained device
826 libinput_device_ref(struct libinput_device *device);
831 * Decrease the refcount of the input device. An input device will be freed
832 * whenever the refcount reaches 0. This may happen during dispatch if the
833 * device was removed from the system. A caller must ensure to reference
834 * the device correctly to avoid dangling pointers.
836 * @param device A previously obtained device
839 libinput_device_unref(struct libinput_device *device);
844 * Set caller-specific data associated with this input device. libinput does
845 * not manage, look at, or modify this data. The caller must ensure the
848 * @param device A previously obtained device
849 * @param user_data Caller-specific data pointer
850 * @see libinput_device_get_user_data
853 libinput_device_set_user_data(struct libinput_device *device, void *user_data);
858 * Get the caller-specific data associated with this input device, if any.
860 * @param device A previously obtained device
861 * @return Caller-specific data pointer or NULL if none was set
862 * @see libinput_device_set_user_data
865 libinput_device_get_user_data(struct libinput_device *device);
870 * Get the system name of the device.
872 * @param device A previously obtained device
873 * @return System name of the device
876 libinput_device_get_sysname(struct libinput_device *device);
881 * A device may be mapped to a single output, or all available outputs. If a
882 * device is mapped to a single output only, a relative device may not move
883 * beyond the boundaries of this output. An absolute device has its input
884 * coordinates mapped to the extents of this output.
886 * @return the name of the output this device is mapped to, or NULL if no
890 libinput_device_get_output_name(struct libinput_device *device);
895 * Get the seat associated with this input device.
897 * @param device A previously obtained device
898 * @return The seat this input device belongs to
900 struct libinput_seat *
901 libinput_device_get_seat(struct libinput_device *device);
906 * Update the LEDs on the device, if any. If the device does not have
907 * LEDs, or does not have one or more of the LEDs given in the mask, this
908 * function does nothing.
910 * @param device A previously obtained device
911 * @param leds A mask of the LEDs to set, or unset.
914 libinput_device_led_update(struct libinput_device *device,
915 enum libinput_led leds);
920 * Set the bitmask in keys to the bitmask of the keys present on the device
921 * (see linux/input.h), up to size characters.
923 * @param device A current input device
924 * @param keys An array filled with the bitmask for the keys
925 * @param size Size of the keys array
928 libinput_device_get_keys(struct libinput_device *device,
929 char *keys, size_t size);
934 * Apply the 3x3 transformation matrix to absolute device coordinates. This
935 * matrix has no effect on relative events.
937 * Given a 6-element array [a, b, c, d, e, f], the matrix is applied as
945 libinput_device_calibrate(struct libinput_device *device,
946 float calibration[6]);
951 * Check if the given device has the specified capability
953 * @return 1 if the given device has the capability or 0 if not
956 libinput_device_has_capability(struct libinput_device *device,
957 enum libinput_device_capability capability);
959 #endif /* LIBINPUT_H */