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<html devsite>
<head>
<title>Getevent</title>
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<meta name="book_path" value="/_book.yaml" />
</head>
<body>
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<p>The <code>getevent</code> tool runs on the device and provides information
about input devices and a live dump of kernel input events.</p>
<p>This tool is useful for ensuring device drivers are reporting the
expected set of capabilities for each input device and are generating the
desired stream of input events.</p>
<h2 id="showing-device-capabilities">Showing device capabilities</h2>
<p>Use the <code>-p</code> option with the <code>adb</code> command to see all of the keys and axes a device
reports.</p>
<pre class="devsite-terminal devsite-click-to-copy">adb shell su -- getevent -p</pre>
<p>The following example lists the Linux key codes and other events a
particular keyboard says it supports.</p>
<pre>
name: "Motorola Bluetooth Wireless Keyboard"
events:
KEY (0001): 0001 0002 0003 0004 0005 0006 0007 0008
0009 000a 000b 000c 000d 000e 000f 0010
0011 0012 0013 0014 0015 0016 0017 0018
0019 001a 001b 001c 001d 001e 001f 0020
0021 0022 0023 0024 0025 0026 0027 0028
0029 002a 002b 002c 002d 002e 002f 0030
0031 0032 0033 0034 0035 0036 0037 0038
0039 003a 003b 003c 003d 003e 003f 0040
0041 0042 0043 0044 0045 0046 0047 0048
0049 004a 004b 004c 004d 004e 004f 0050
0051 0052 0053 0055 0056 0057 0058 0059
005a 005b 005c 005d 005e 005f 0060 0061
0062 0063 0064 0066 0067 0068 0069 006a
006b 006c 006d 006e 006f 0071 0072 0073
0074 0075 0077 0079 007a 007b 007c 007d
007e 007f 0080 0081 0082 0083 0084 0085
0086 0087 0088 0089 008a 008c 008e 0090
0096 0098 009b 009c 009e 009f 00a1 00a3
00a4 00a5 00a6 00ab 00ac 00ad 00b0 00b1
00b2 00b3 00b4 00b7 00b8 00b9 00ba 00bb
00bc 00bd 00be 00bf 00c0 00c1 00c2 00d9
00f0 0110 0111 0112 01ba
REL (0002): 0000 0001 0008
ABS (0003): 0028 : value 223, min 0, max 255, fuzz 0, flat 0, resolution 0
0029 : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
002a : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
002b : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
MSC (0004): 0004
LED (0011): 0000 0001 0002 0003 0004
input props:
&lt;none&gt;
</pre>
<p>Use the <code>-i</code> option to get more information, including HID mapping
tables and debugging information.</p>
<p>Use the <code>-l</code> option to display textual labels for all event codes.</p>
<pre class="devsite-terminal devsite-click-to-copy">
adb shell su -- getevent -lp /dev/input/event1
</pre>
<p>Example:</p>
<pre>
name: "Melfas MMSxxx Touchscreen"
events:
ABS (0003): ABS_MT_SLOT : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
ABS_MT_TOUCH_MAJOR : value 0, min 0, max 30, fuzz 0, flat 0, resolution 0
ABS_MT_POSITION_X : value 0, min 0, max 720, fuzz 0, flat 0, resolution 0
ABS_MT_POSITION_Y : value 0, min 0, max 1280, fuzz 0, flat 0, resolution 0
ABS_MT_TRACKING_ID : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
ABS_MT_PRESSURE : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
input props:
INPUT_PROP_DIRECT
</pre>
<h2 id="showing-live-events">Showing live events</h2>
<p>The following example shows a two-finger multi-touch gesture for a
touchscreen using the Linux multi-touch input protocol "B". The <code>-l</code>
option displays textual labels and the <code>-t</code> option displays
timestamps.</p>
<pre class="devsite-terminal devsite-click-to-copy">
adb shell su -- getevent -lt /dev/input/event1
</pre>
<p>Example:</p>
<pre>
[ 78826.389007] EV_ABS ABS_MT_TRACKING_ID 0000001f
[ 78826.389038] EV_ABS ABS_MT_PRESSURE 000000ab
[ 78826.389038] EV_ABS ABS_MT_POSITION_X 000000ab
[ 78826.389068] EV_ABS ABS_MT_POSITION_Y 0000025b
[ 78826.389068] EV_ABS ABS_MT_SLOT 00000001
[ 78826.389068] EV_ABS ABS_MT_TRACKING_ID 00000020
[ 78826.389068] EV_ABS ABS_MT_PRESSURE 000000b9
[ 78826.389099] EV_ABS ABS_MT_POSITION_X 0000019e
[ 78826.389099] EV_ABS ABS_MT_POSITION_Y 00000361
[ 78826.389099] EV_SYN SYN_REPORT 00000000
[ 78826.468688] EV_ABS ABS_MT_SLOT 00000000
[ 78826.468688] EV_ABS ABS_MT_TRACKING_ID ffffffff
[ 78826.468719] EV_ABS ABS_MT_SLOT 00000001
[ 78826.468719] EV_ABS ABS_MT_TRACKING_ID ffffffff
[ 78826.468719] EV_SYN SYN_REPORT 00000000
</pre>
<p class="note"><strong>Note:</strong> <code>getevent</code> timestamps use
the format $SECONDS.$MICROSECONDS in the CLOCK_MONOTONIC timebase. For details,
refer to getevent.c.</p>
</body>
</html>