| page.title=Getevent |
| @jd: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>It is very useful tool for ensuring that device drivers are reporing the |
| expected set of capabilities for each input device and are generating the |
| desired stream of input events.</p> |
| <h2 id="usage">Usage</h2> |
| <h3 id="showing-device-capabilities">Showing Device Capabilities</h3> |
| <p>It is often quite useful to see all of the keys and axes that a device reports. |
| Use the <code>-p</code> option to do that.</p> |
| <p>Here is a list of all of the Linux key codes and other events that a |
| particular keyboard says it supports.</p> |
| <pre><code>$ adb shell su -- getevent -p |
| |
| 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: |
| <none> |
| </code></pre> |
| <p>The <code>-i</code> option shows even more information than <code>-p</code>, including HID mapping tables |
| and debugging information.</p> |
| <p>The <code>-l</code> option uses textual labels for all event codes, which is handy.</p> |
| <pre><code>$ adb shell su -- getevent -lp /dev/input/event1 |
| |
| 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 |
| </code></pre> |
| <h3 id="showing-live-events">Showing Live Events</h3> |
| <p>This is what a two finger multitouch gesture looks like for a touch screen |
| that is using the Linux multitouch input protocol "B". We use the <code>-l</code> option |
| to show textual labels and <code>-t</code> to show timestamps.</p> |
| <pre><code>$ adb shell su -- getevent -lt /dev/input/event1 |
| |
| [ 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 |
| </code></pre> |
