1page.title=Getevent 2@jd:body 3 4<!-- 5 Copyright 2015 The Android Open Source Project 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18--> 19<div id="qv-wrapper"> 20 <div id="qv"> 21 <h2>In this document</h2> 22 <ol id="auto-toc"> 23 </ol> 24 </div> 25</div> 26 27<p>The <code>getevent</code> tool runs on the device and provides information 28about input devices and a live dump of kernel input events.</p> 29<p>This tool is useful for ensuring device drivers are reporting the 30expected set of capabilities for each input device and are generating the 31desired stream of input events.</p> 32 33<h2 id="showing-device-capabilities">Showing device capabilities</h2> 34<p>Use the <code>-p</code> option to see all of the keys and axes a device 35reports. The following example lists the Linux key codes and other events a 36particular keyboard says it supports.</p> 37 38<pre><code>$ adb shell su -- getevent -p 39 40 name: "Motorola Bluetooth Wireless Keyboard" 41 events: 42 KEY (0001): 0001 0002 0003 0004 0005 0006 0007 0008 43 0009 000a 000b 000c 000d 000e 000f 0010 44 0011 0012 0013 0014 0015 0016 0017 0018 45 0019 001a 001b 001c 001d 001e 001f 0020 46 0021 0022 0023 0024 0025 0026 0027 0028 47 0029 002a 002b 002c 002d 002e 002f 0030 48 0031 0032 0033 0034 0035 0036 0037 0038 49 0039 003a 003b 003c 003d 003e 003f 0040 50 0041 0042 0043 0044 0045 0046 0047 0048 51 0049 004a 004b 004c 004d 004e 004f 0050 52 0051 0052 0053 0055 0056 0057 0058 0059 53 005a 005b 005c 005d 005e 005f 0060 0061 54 0062 0063 0064 0066 0067 0068 0069 006a 55 006b 006c 006d 006e 006f 0071 0072 0073 56 0074 0075 0077 0079 007a 007b 007c 007d 57 007e 007f 0080 0081 0082 0083 0084 0085 58 0086 0087 0088 0089 008a 008c 008e 0090 59 0096 0098 009b 009c 009e 009f 00a1 00a3 60 00a4 00a5 00a6 00ab 00ac 00ad 00b0 00b1 61 00b2 00b3 00b4 00b7 00b8 00b9 00ba 00bb 62 00bc 00bd 00be 00bf 00c0 00c1 00c2 00d9 63 00f0 0110 0111 0112 01ba 64 REL (0002): 0000 0001 0008 65 ABS (0003): 0028 : value 223, min 0, max 255, fuzz 0, flat 0, resolution 0 66 0029 : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0 67 002a : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0 68 002b : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0 69 MSC (0004): 0004 70 LED (0011): 0000 0001 0002 0003 0004 71 input props: 72 <none> 73</code></pre> 74 75<p>Use the <code>-i</code> option to get more information, including HID mapping 76tables and debugging information.</p> 77 78<p>Use the <code>-l</code> option to display textual labels for all event codes. 79Example:</p> 80<pre><code>$ adb shell su -- getevent -lp /dev/input/event1 81 82 name: "Melfas MMSxxx Touchscreen" 83 events: 84 ABS (0003): ABS_MT_SLOT : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0 85 ABS_MT_TOUCH_MAJOR : value 0, min 0, max 30, fuzz 0, flat 0, resolution 0 86 ABS_MT_POSITION_X : value 0, min 0, max 720, fuzz 0, flat 0, resolution 0 87 ABS_MT_POSITION_Y : value 0, min 0, max 1280, fuzz 0, flat 0, resolution 0 88 ABS_MT_TRACKING_ID : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0 89 ABS_MT_PRESSURE : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0 90 input props: 91 INPUT_PROP_DIRECT 92</code></pre> 93<h2 id="showing-live-events">Showing live events</h2> 94<p>The following example shows a two-finger multi-touch gesture for a 95touchscreen using the Linux multi-touch input protocol "B". The <code>-l</code> 96option displays textual labels and the <code>-t</code> option displays 97timestamps.</p> 98 99<pre><code>$ adb shell su -- getevent -lt /dev/input/event1 100 101[ 78826.389007] EV_ABS ABS_MT_TRACKING_ID 0000001f 102[ 78826.389038] EV_ABS ABS_MT_PRESSURE 000000ab 103[ 78826.389038] EV_ABS ABS_MT_POSITION_X 000000ab 104[ 78826.389068] EV_ABS ABS_MT_POSITION_Y 0000025b 105[ 78826.389068] EV_ABS ABS_MT_SLOT 00000001 106[ 78826.389068] EV_ABS ABS_MT_TRACKING_ID 00000020 107[ 78826.389068] EV_ABS ABS_MT_PRESSURE 000000b9 108[ 78826.389099] EV_ABS ABS_MT_POSITION_X 0000019e 109[ 78826.389099] EV_ABS ABS_MT_POSITION_Y 00000361 110[ 78826.389099] EV_SYN SYN_REPORT 00000000 111[ 78826.468688] EV_ABS ABS_MT_SLOT 00000000 112[ 78826.468688] EV_ABS ABS_MT_TRACKING_ID ffffffff 113[ 78826.468719] EV_ABS ABS_MT_SLOT 00000001 114[ 78826.468719] EV_ABS ABS_MT_TRACKING_ID ffffffff 115[ 78826.468719] EV_SYN SYN_REPORT 00000000 116</code></pre> 117<p class="note"><strong>Note:</strong> <code>getevent</code> timestamps use 118the format $SECONDS.$MICROSECONDS in the CLOCK_MONOTONIC timebase. For details, 119refer to getevent.c.</p>