input之我见02——Input调试Tips

input之我见02——Input调试Tips

在kernel对Input有了一定的认识之后，就开始Android的Input之旅，先不急着深挖代码，来看看如何获得Input的相关打印信息。
1，根据事件路由，打开各个节点debug信息
  • EventHub.cpp

KeyWord:

#define LOG_TAG “EventHub”
#define LOG_NDEBUG 0
KeyFunction:
getEvents()
  • InputReader.cpp
KeyWord:
#define LOG_TAG “InputReader”
#define LOG_NDEBUG 0
KeyFunction:
loopOnce()

  • InputDispatcher()
KeyWord:
#define LOG_TAG “InputDispatcher”
#define LOG_NDEBUG 0
#define DEBUG_INBOUND_EVENT_DETAILS 1
#define DEBUG_OUTBOUND_EVENT_DETAILS 2
KeyFunction:
notifyKey()
示例：
logcat -s “EventHub” “InputReader” “InputDispatcher” 
  1. 01-01 00:00:21.734  4076  4114 V EventHub: Opening device: /dev/input/event2
  2. 01-01 00:00:21.734  4076  4114 V EventHub: Created descriptor: raw=:1b8e:0cec:, cooked=02b1ce58713e0e531eab61b0742baac6893ff49f
  3. 01-01 00:00:21.734  4076  4114 V EventHub: add device 1: /dev/input/event2
  4. 01-01 00:00:21.734  4076  4114 V EventHub:   bus:        0010
  5. 01-01 00:00:21.734  4076  4114 V EventHub:   vendor      1b8e
  6. 01-01 00:00:21.734  4076  4114 V EventHub:   product     0cec
  7. 01-01 00:00:21.734  4076  4114 V EventHub:   version     0001
  8. 01-01 00:00:21.734  4076  4114 V EventHub:   name:       "cec_input"
  9. 01-01 00:00:21.734  4076  4114 V EventHub:   location:   ""
  10. 01-01 00:00:21.734  4076  4114 V EventHub:   unique id:  ""
  11. 01-01 00:00:21.734  4076  4114 V EventHub:   descriptor: "02b1ce58713e0e531eab61b0742baac6893ff49f"
  12. 01-01 00:00:21.734  4076  4114 V EventHub:   driver:     v1.0.1
  13. 01-01 00:00:21.735  4076  4114 D EventHub: No input device configuration file found for device 'cec_input'.
  14. 01-01 00:00:21.741  4076  4114 W EventHub: Unable to disable kernel key repeat for /dev/input/event2: Function not implemented
  15. 01-01 00:00:21.741  4076  4114 I EventHub: New device: id=1, fd=88, path='/dev/input/event2', name='cec_input', classes=0x1, configuration='', keyLayout='/system/usr/keylayout/Generic.kl', keyCharacterMap='/system/usr/keychars/Generic.kcm', builtinKeyboard=false, wakeMechanism=EPOLLWAKEUP, usingClockIoctl=true
  16. 01-01 00:00:21.741  4076  4114 V EventHub: Opening device: /dev/input/mice
  17. 01-01 00:00:21.741  4076  4114 E EventHub: could not get driver version for /dev/input/mice, Not a typewriter
  18. 01-01 00:00:21.794  4076  4114 V EventHub: Opening device: /dev/input/event1
  19. 01-01 00:00:21.795  4076  4114 V EventHub: Created descriptor: raw=:0001:0001:, cooked=485d69228e24f5e46da1598745890b214130dbc4
  20. 01-01 00:00:21.795  4076  4114 V EventHub: add device 2: /dev/input/event1
  21. 01-01 00:00:21.795  4076  4114 V EventHub:   bus:        0010
  22. 01-01 00:00:21.795  4076  4114 V EventHub:   vendor      0001
  23. 01-01 00:00:21.795  4076  4114 V EventHub:   product     0001
  24. 01-01 00:00:21.795  4076  4114 V EventHub:   version     0100
  25. 01-01 00:00:21.795  4076  4114 V EventHub:   name:       "gpio_keypad"
  26. 01-01 00:00:21.795  4076  4114 V EventHub:   location:   "gpio_keypad/input0"
  27. 01-01 00:00:21.795  4076  4114 V EventHub:   unique id:  ""
  28. 01-01 00:00:21.795  4076  4114 V EventHub:   descriptor: "485d69228e24f5e46da1598745890b214130dbc4"
  29. 01-01 00:00:21.795  4076  4114 V EventHub:   driver:     v1.0.1
  30. 01-01 00:00:21.795  4076  4114 D EventHub: No input device configuration file found for device 'gpio_keypad'.
  31. 01-01 00:00:21.800  4076  4114 I EventHub: New device: id=2, fd=89, path='/dev/input/event1', name='gpio_keypad', classes=0x1, configuration='', keyLayout='/system/usr/keylayout/Generic.kl', keyCharacterMap='/system/usr/keychars/Generic.kcm', builtinKeyboard=false, wakeMechanism=EPOLLWAKEUP, usingClockIoctl=true
  32. 01-01 00:00:21.800  4076  4114 V EventHub: Opening device: /dev/input/event0
  33. 01-01 00:00:21.801  4076  4114 V EventHub: Created descriptor: raw=:0001:0001:nonce:0001, cooked=d2c52ff0f656fac4cd7b7a118d575e0109a9fe1c
  34. 01-01 00:00:21.801  4076  4114 V EventHub: add device 3: /dev/input/event0
  35. 01-01 00:00:21.801  4076  4114 V EventHub:   bus:        0010
  36. 01-01 00:00:21.801  4076  4114 V EventHub:   vendor      0001
  37. 01-01 00:00:21.801  4076  4114 V EventHub:   product     0001
  38. 01-01 00:00:21.801  4076  4114 V EventHub:   version     0100
  39. 01-01 00:00:21.801  4076  4114 V EventHub:   name:       "aml_keypad"
  40. 01-01 00:00:21.801  4076  4114 V EventHub:   location:   "keypad/input0"
  41. 01-01 00:00:21.801  4076  4114 V EventHub:   unique id:  ""
  42. 01-01 00:00:21.801  4076  4114 V EventHub:   descriptor: "d2c52ff0f656fac4cd7b7a118d575e0109a9fe1c"
  43. 01-01 00:00:21.801  4076  4114 V EventHub:   driver:     v1.0.1
  44. 01-01 00:00:21.801  4076  4114 D EventHub: No input device configuration file found for device 'aml_keypad'.
  45. 01-01 00:00:21.805  4076  4114 W EventHub: Unable to disable kernel key repeat for /dev/input/event0: Function not implemented
  46. 01-01 00:00:21.805  4076  4114 I EventHub: New device: id=3, fd=90, path='/dev/input/event0', name='aml_keypad', classes=0x863, configuration='', keyLayout='/system/usr/keylayout/Generic.kl', keyCharacterMap='/system/usr/keychars/Generic.kcm', builtinKeyboard=false, wakeMechanism=EPOLLWAKEUP, usingClockIoctl=true
  47. 01-01 00:00:21.805  4076  4114 V EventHub: Created descriptor: raw=:0000:0000:uniqueId:<virtual>name:Virtual, cooked=a718a782d34bc767f4689c232d64d527998ea7fd
  48. 01-01 00:00:21.810  4076  4114 V EventHub: Reporting device opened: id=-1, name=<virtual>
  49. 01-01 00:00:21.810  4076  4114 V EventHub: Reporting device opened: id=3, name=/dev/input/event0
  50. 01-01 00:00:21.810  4076  4114 V EventHub: Reporting device opened: id=2, name=/dev/input/event1
  51. 01-01 00:00:21.810  4076  4114 V EventHub: Reporting device opened: id=1, name=/dev/input/event2
  52. 01-01 00:00:21.810  4076  4114 I InputReader: Device added: id=-1, name='Virtual', sources=0x00000301
  53. 01-01 00:00:21.810  4076  4114 I InputReader: Device added: id=3, name='aml_keypad', sources=0x00004703
  54. 01-01 00:00:21.811  4076  4114 I InputReader: Reconfiguring input devices.  changes=0x00000080
  55. 01-01 00:00:21.811  4076  4114 I InputReader: Device added: id=2, name='gpio_keypad', sources=0x00000101
  56. 01-01 00:00:21.811  4076  4114 I InputReader: Device added: id=1, name='cec_input', sources=0x00000101
  57. 01-01 00:00:21.811  4076  4114 D InputDispatcher: notifyDeviceReset - eventTime=16199233173, deviceId=-1
  58. 01-01 00:00:21.811  4076  4114 D InputDispatcher: notifyDeviceReset - eventTime=16199233173, deviceId=3
  59. 01-01 00:00:21.811  4076  4114 D InputDispatcher: notifyDeviceReset - eventTime=16199233173, deviceId=2
  60. 01-01 00:00:21.811  4076  4113 D InputDispatcher: dispatchDeviceReset - eventTime=16199233173, deviceId=-1
  61. 01-01 00:00:21.811  4076  4113 D InputDispatcher: dispatchDeviceReset - eventTime=16199233173, deviceId=3
  62. 01-01 00:00:21.811  4076  4114 D InputDispatcher: notifyDeviceReset - eventTime=16199233173, deviceId=1
  63. 01-01 00:00:21.811  4076  4113 D InputDispatcher: dispatchDeviceReset - eventTime=16199233173, deviceId=2
  64. 01-01 00:00:21.811  4076  4114 D InputDispatcher: notifyConfigurationChanged - eventTime=16199233173
  65. 01-01 00:00:21.811  4076  4113 D InputDispatcher: dispatchDeviceReset - eventTime=16199233173, deviceId=1
  66. 01-01 00:00:21.812  4076  4113 D InputDispatcher: dispatchConfigurationChanged - eventTime=16199233173
2，KeyLayout文件加载debug
framework/native/libs/input/InputDevice.cpp
#define LOG_TAG “InputDevice”
+#define DEBUG_PROBE 1
+#define LOG_NDEBUG 0
framework/native/libs/input/KeyLayoutMap.cpp
#define LOG_TAG “KeyLayoutMap”
#define LOG_NDEBUG 0
#define DEBUG_PARSER 1
#define DEBUG_MAPPING 1
示例：
logcat -s “EventHub” “InputDevice” “KeyLayoutMap“
3，dumpsys input
读取Input相关的信息，大概分为Event Hub State、Input Reader State、Input Dispatcher State这三个部分，从这里，同时也初窥到了Android中Input的层次关系
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