input系统——android input系统

AndroidInput系统——JNI NativeInputManager InputManger InputReader

AndroidInput系统——InputReader

AndroidInput系统——InputDispatcher

AndroidInput系统——EventHub

Android Input系统相关结构体

1. input_device_id

struct input_device_id {
 kernel_ulong_t flags;
 __u16 bustype;  // BUS_USB  BUS_BLUETOOTH
 __u16 vendor;
 __u16 product;
 __u16 version;
 kernel_ulong_t evbit[INPUT_DEVICE_ID_EV_MAX / BITS_PER_LONG + 1];

 kernel_ulong_t keybit[INPUT_DEVICE_ID_KEY_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t relbit[INPUT_DEVICE_ID_REL_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t absbit[INPUT_DEVICE_ID_ABS_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t mscbit[INPUT_DEVICE_ID_MSC_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t ledbit[INPUT_DEVICE_ID_LED_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t sndbit[INPUT_DEVICE_ID_SND_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t ffbit[INPUT_DEVICE_ID_FF_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t swbit[INPUT_DEVICE_ID_SW_MAX / BITS_PER_LONG + 1];
 kernel_ulong_t driver_info;
};

2. input_event (input.h)

struct input_event {
    struct timeval time;
    __u16 type;
    __u16 code;
    __s32 value;
};

3. RawEvent (EventHub.h)

struct RawEvent {
    nsecs_t when;       time
    int32_t deviceId;   ID    = 1       ID         = 0
    int32_t type;       EV_REL= 0x02    EV_SYN     = 0x00
    int32_t code;       REL_X = 0x00    SYN_REPORT = 0
    int32_t value;      Value = 0x01    Value      = 0x00
};

调试相关

查看event注册设备

shell@rk3368_32:/dev/input # cat /proc/bus/input/devices
I: Bus=0000 Vendor=0000 Product=0003 Version=206a
N: Name="synaptics_dsx"
P: Phys=synaptics_dsx/touch_input
S: Sysfs=/devices/ff140000.i2c/i2c-2/2-0020/input/input0
U: Uniq=
H: Handlers=event0 cpufreq ddr_freq
B: PROP=2
B: EV=b
B: KEY=420 0 0 0 0 0 8000 0 0 0 0
B: ABS=2638000 3

I: Bus=0019 Vendor=0000 Product=0000 Version=0000
N: Name="rotary.35"
P: Phys=
S: S 大专栏  input系统——android input系统ysfs=/devices/rotary.35/input/input1
U: Uniq=
H: Handlers=event1
B: PROP=0
B: EV=5
B: REL=1

I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="rk29-keypad"
P: Phys=gpio-keys/input0
S: Sysfs=/devices/ff100000.adc/key.38/input/input2
U: Uniq=
H: Handlers=event2 ddr_freq keychord
B: PROP=0
B: EV=3
B: KEY=8000 100000 0 0 0

I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="temperature"
P: Phys=
S: Sysfs=/devices/ff160000.i2c/i2c-4/4-005b/input/input3
U: Uniq=
H: Handlers=event3
B: PROP=0
B: EV=9
B: ABS=40

查看Handler个数

shell@rk3368_box:/dev/input # ls -l
crw-rw---- root     input     13,  64 2017-04-12 11:15 event0
crw-rw---- root     input     13,  65 2017-04-12 11:15 event1
crw-rw---- root     input     13,  66 2017-04-14 08:12 event2
crw-rw---- root     input     13,  67 2017-04-14 08:12 event3

cat event0
cat event1

getevent 获取事件

# getevent -h
Usage: getevent [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-d] [-p] [-i] [-l] [-q] [-c count] [-r] [device]
    -t: show time stamps
    -n: don't print newlines
    -s: print switch states for given bits
    -S: print all switch states
    -v: verbosity mask (errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64)
    -d: show HID descriptor, if available
    -p: show possible events (errs, dev, name, pos. events)
    -i: show all device info and possible events
    -l: label event types and names in plain text
    -q: quiet (clear verbosity mask)
    -c: print given number of events then exit
    -r: print rate events are received

常用命令组合：
    getevent -p    // see all of the keys and axes a device reports
    getevent -ip   // get more information, including HID mapping tables and debugging information
    getevent -lp   // option to display textual labels for all event codes
    getevent -lp
    getevent -r -q    监控设备的sendevent事件 

getevent -p
add device 1: /dev/input/event3
  name:     "temperature"
add device 2: /dev/input/event1
  name:     "rotary.35"
add device 3: /dev/input/event0
  name:     "synaptics_dsx"
add device 4: /dev/input/event2
  name:     "rk29-keypad"

/dev/input/event1: 0002 0000 00000001   ID=1    EV_REL=0x02   REL_X = 0x00    Value = 0x01
/dev/input/event1: 0000 0000 00000000   ID=0    EV_SYN 0x00   SYN_REPORT = 0  Value = 0x00
/dev/input/event1: 0002 0000 00000001
/dev/input/event1: 0000 0000 00000000
/dev/input/event1: 0002 0000 00000001
/dev/input/event1: 0000 0000 00000000
/dev/input/event1: 0002 0000 ffffffff       EV_REL=0x02   REL_X = 0x00    Value = 0xffffffffff
/dev/input/event1: 0000 0000 00000000
/dev/input/event1: 0002 0000 ffffffff

dumpsys

dumpsys input：
To dump the input system’s state (Event Hub State,Input Reader State,Input Dispatcher State)