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evdev.lisp
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(in-package :cl-evdev)
(define-constant +input-event-types+
'((#x00 . :ev-syn)
(#x01 . :ev-key)
(#x02 . :ev-rel)
(#x03 . :ev-abs)
(#x04 . :ev-msc)
(#x05 . :ev-sw)
(#x11 . :ev-led)
(#x12 . :ev-snd)
(#x14 . :ev-rep)
(#x15 . :ev-ff)
(#x16 . :ev-pwr)
(#x17 . :ev-ff-status))
:test #'equal
:documentation "The type of an input event stored in the type field of the
Linux input_event struct in linux/include/uapi/linux/input.h. Not expected to be
used outside of this package.")
(define-constant +input-syn-codes+
'((0 . :syn-report)
(1 . :syn-config)
(2 . :syn-mt-report)
(3 . :syn-dropped))
:test #'equal
:documentation "The code of a Linux EV_SYN event type.
SYN_REPORT is used to synchronize events between the kernel and this driver.
They don't actually contain anything useful other than that.
SYN_DROPPED indicates we've dropped input events because we weren't reading fast
enough, and that we should skip events until the next SYN_REPORT type, and query
via an ioctl to get the current state.")
(define-constant +input-key-states+
'((0 . :released)
(1 . :pressed)
(2 . :repeat))
:test #'equal
:documentation "Keyboard input key states as stored in the value field of the
Linux input_event struct in linux/include/uapi/linux/input.h. Not expected to be
used outside of this package.")
(define-constant +input-key-codes+
'((0 . (:name reserved :glyph nil))
(1 . (:name esc :glyph nil))
(2 . (:name 1 :glyph #\1))
(3 . (:name 2 :glyph #\2))
(4 . (:name 3 :glyph #\3))
(5 . (:name 4 :glyph #\4))
(6 . (:name 5 :glyph #\5))
(7 . (:name 6 :glyph #\6))
(8 . (:name 7 :glyph #\7))
(9 . (:name 8 :glyph #\8))
(10 . (:name 9 :glyph #\9))
(11 . (:name 0 :glyph #\0))
(12 . (:name minus :glyph #\-))
(13 . (:name equal :glyph #\=))
(14 . (:name backspace :glyph #\Backspace))
(15 . (:name tab :glyph #\Tab))
(16 . (:name q :glyph #\q))
(17 . (:name w :glyph #\w))
(18 . (:name e :glyph #\e))
(19 . (:name r :glyph #\r))
(20 . (:name t :glyph #\t))
(21 . (:name y :glyph #\y))
(22 . (:name u :glyph #\u))
(23 . (:name i :glyph #\i))
(24 . (:name o :glyph #\o))
(25 . (:name p :glyph #\p))
(26 . (:name leftbrace :glyph #\[))
(27 . (:name rightbrace :glyph #\]))
(28 . (:name enter :glyph #\Newline))
(29 . (:name leftctrl :glyph nil))
(30 . (:name a :glyph #\a))
(31 . (:name s :glyph #\s))
(32 . (:name d :glyph #\d))
(33 . (:name f :glyph #\f))
(34 . (:name g :glyph #\g))
(35 . (:name h :glyph #\h))
(36 . (:name j :glyph #\j))
(37 . (:name k :glyph #\k))
(38 . (:name l :glyph #\l))
(39 . (:name semicolon :glyph #\;))
(40 . (:name apostrophe :glyph #\'))
(41 . (:name grave :glyph #\`))
(42 . (:name leftshift :glyph nil))
(43 . (:name backslash :glyph #\\))
(44 . (:name z :glyph #\z))
(45 . (:name x :glyph #\x))
(46 . (:name c :glyph #\c))
(47 . (:name v :glyph #\v))
(48 . (:name b :glyph #\b))
(49 . (:name n :glyph #\n))
(50 . (:name m :glyph #\m))
(51 . (:name comma :glyph #\,))
(52 . (:name dot :glyph #\.))
(53 . (:name slash :glyph #\/))
(54 . (:name rightshift :glyph nil))
(55 . (:name kpasterisk :glyph #\*))
(56 . (:name leftalt :glyph nil))
(57 . (:name space :glyph #\Space))
(58 . (:name capslock :glyph nil))
(59 . (:name f1 :glyph nil))
(60 . (:name f2 :glyph nil))
(61 . (:name f3 :glyph nil))
(62 . (:name f4 :glyph nil))
(63 . (:name f5 :glyph nil))
(64 . (:name f6 :glyph nil))
(65 . (:name f7 :glyph nil))
(66 . (:name f8 :glyph nil))
(67 . (:name f9 :glyph nil))
(68 . (:name f10 :glyph nil))
(69 . (:name numlock :glyph nil))
(70 . (:name scrolllock :glyph nil))
(71 . (:name kp7 :glyph nil))
(72 . (:name kp8 :glyph nil))
(73 . (:name kp9 :glyph nil))
(74 . (:name kpminus :glyph nil))
(75 . (:name kp4 :glyph nil))
(76 . (:name kp5 :glyph nil))
(77 . (:name kp6 :glyph nil))
(78 . (:name kpplus :glyph nil))
(79 . (:name kp1 :glyph nil))
(80 . (:name kp2 :glyph nil))
(81 . (:name kp3 :glyph nil))
(82 . (:name kp0 :glyph nil))
(83 . (:name kpdot :glyph #\.))
(85 . (:name zenkakuhankaku :glyph nil))
(86 . (:name 102nd :glyph nil))
(87 . (:name f11 :glyph nil))
(88 . (:name f12 :glyph nil))
(96 . (:name kpenter :glyph #\Newline))
(97 . (:name rightctrl :glyph nil))
(98 . (:name kpslash :glyph nil))
(99 . (:name sysrq :glyph nil))
(100 . (:name rightalt :glyph nil))
(101 . (:name linefeed :glyph nil))
(102 . (:name home :glyph nil))
(103 . (:name up :glyph nil))
(104 . (:name pageup :glyph nil))
(105 . (:name left :glyph nil))
(106 . (:name right :glyph nil))
(107 . (:name end :glyph nil))
(108 . (:name down :glyph nil))
(109 . (:name pagedown :glyph nil))
(110 . (:name insert :glyph nil))
(111 . (:name delete :glyph #\Delete))
(112 . (:name macro :glyph nil))
(113 . (:name mute :glyph nil))
(114 . (:name volumedown :glyph nil))
(115 . (:name volumeup :glyph nil))
(116 . (:name power :glyph nil))
(117 . (:name kpequal :glyph #\=))
(118 . (:name kpplusminus :glyph nil))
(119 . (:name pause :glyph nil)))
:test #'equal
:documentation "List of key code to key symbol name and printable character.
Used to decode the code field of the Linux input_event struct defined in
linux/include/uapi/linux/input.h.")
(define-unsigned unsigned-long-int 8)
(define-unsigned unsigned-short 2)
(define-unsigned unsigned-int 4)
(define-binary-class input-event-struct ()
((tv_sec :binary-type unsigned-long-int)
(tv_usec :binary-type unsigned-long-int)
(type :binary-type unsigned-short)
(code :binary-type unsigned-short)
(value :binary-type unsigned-int))
(:documentation "This is a verbaticm copy of the input_event struct defined in
linux/include/uapi/linux/input.h. This is used to read in each event straight
from raw evdev data."))
(defclass input-event (event)
((timestamp :initarg :timestamp
:type duration))
(:documentation "The base class for evdev input events."))
(defmethod print-object ((object input-event-struct) stream)
(print-unreadable-object (object stream :type t)
(with-slots (tv_sec tv_usec type code value) object
(let ((type (cdr (assoc type +input-event-types+))))
(format stream ":TV_SEC ~a :TV_USEC ~a :TYPE ~a :CODE ~a :VALUE ~a"
tv_sec tv_usec type code value)))))
(defmethod print-object ((object input-event) stream)
(print-unreadable-object (object stream :type t)
(with-slots (timestamp) object
(format stream ":TIMESTAMP ~a"
timestamp))))
(defclass keyboard-event (input-event)
((state :initarg :state
:type (or :released :pressed :repeat)
:documentation
"The state of the key for this event. One of :RELEASED, :PRESSED, or
:REPEAT.")
(name :initarg :name
:accessor :name
:type symbol
:documentation
"The human-readable name for the key. Every key event has one.")
(glyph :initarg :glyph
:accessor :glyph
:type symbol
:documentation
"The character code point for this key. May be NIL."))
(:documentation "An INPUT-EVENT that contains keyboard-specific state data."))
(defmethod print-object ((object keyboard-event) stream)
(print-unreadable-object (object stream :type t)
(with-slots (name glyph state) object
(format stream ":NAME ~a :GLYPH ~a :STATE ~a" name glyph state))))
(defclass sync-event (input-event)
((dropped-events :initarg :dropped-events
:type boolean
:documentation
"Whether or not events have been dropped between this event
and the next SYNC-EVENT."))
(:documentation "An INPUT-EVENT that contains synchronization state data."))
(defmethod print-object ((object sync-event) stream)
(print-unreadable-object (object stream :type t)
(with-slots (dropped-events) object
(format stream ":DROPPED-EVENTS ~a" dropped-events))))
(defclass misc-event (input-event)
()
(:documentation "Represents a miscellaneous evdev event."))
(defun read-raw-event (stream)
"Reads in a single INPUT-EVENT-STRUCT from STREAM."
(let ((*endian* :little-endian))
(read-binary 'input-event-struct stream)))
(defun raw-event-struct-type (struct)
"Returns a symbol denoting the event type for the given STRUcT."
(with-slots (type) struct
(rest (assoc type +input-event-types+))))
(defun usecs-to-nsecs (usecs)
"converts evdev tv_usec microseconds to nanoseconds."
(* usecs 1000))
(defun read-event (stream)
"Reads an event from the evdev data STREAM and returns an instance of INPUT-EVENT."
(let* ((*endian* :little-endian)
(event (read-raw-event stream)))
(with-slots (tv_sec tv_usec type code value) event
(let ((event-type (raw-event-struct-type event))
(timestamp (unix-to-timestamp tv_sec :nsec (usecs-to-nsecs tv_usec))))
(cond ((eq event-type :ev-key)
(let* ((key-code (rest (assoc code +input-key-codes+)))
(name (getf key-code :name))
(glyph (getf key-code :glyph))
(state (rest (assoc value +input-key-states+))))
(make-instance 'keyboard-event
:timestamp timestamp
:name name
:glyph glyph
:state state)))
((eq event-type :ev-msc)
(make-instance 'misc-event
:timestamp timestamp))
((eq event-type :ev-syn)
(let ((syn-code (rest (assoc code +input-syn-codes+))))
(make-instance 'sync-event
:timestamp timestamp
:dropped-events (eq syn-code :syn-dropped))))
(t (warn "Unknown evdev event type ~S" event-type) nil))))))
(defmacro with-evdev-device ((event-var device-path)
&body body)
"Opens DEVICE-PATH for reading, reads in individual events into EVENT-VAR and
calls BODY for each event passed in. DEVICE-PATH must exist, otherwise an error
condition is signaled."
`(with-open-file (stream ,device-path
:element-type '(unsigned-byte 8)
:direction :io
:if-does-not-exist :error
:if-exists :append)
(loop for ,event-var = (read-event stream)
while ,event-var do
(unwind-protect ,@body))))
(export '(input-event
keyboard-event
misc-event
read-event
with-evdev-device))