KEYCODE_HOME
$ adb shell input keyevent 3
KEYCODE_BACK (you might have to execute it few times to get to HOME)
$ adb shell input keyevent 4
KEYCODE_CALL - opens the Call log
$ adb shell input keyevent 5
KEYCODE_ENDCALL - if not calling, same as pressing power button (you get choices: Power off, Airplane mode, Silent mode)
$ adb shell input keyevent 6
KEYCODE_VOLUME_UP - more noise
$ adb shell input keyevent 24
KEYCODE_POWER - same as pressing power button (you get choices: Power off, Airplane mode, Silent mode)
$ adb shell input keyevent 26
KEYCODE_CAMERA
$ adb shell input keyevent 27
KEYCODE_CLEAR
$ adb shell input keyevent 28
Full list of codes:
0 - KEYCODE_UNKNOWN
1 - KEYCODE_MENU
2 - KEYCODE_SOFT_RIGHT
3 - KEYCODE_HOME
4 - KEYCODE_BACK
5 - KEYCODE_CALL
6 - KEYCODE_ENDCALL
7 - KEYCODE_0
8 - KEYCODE_1
9 - KEYCODE_2
10 - KEYCODE_3
11 - KEYCODE_4
12 - KEYCODE_5
13 - KEYCODE_6
14 - KEYCODE_7
15 - KEYCODE_8
16 - KEYCODE_9
17 - KEYCODE_STAR
18 - KEYCODE_POUND
19 - KEYCODE_DPAD_UP
20 - KEYCODE_DPAD_DOWN
21 - KEYCODE_DPAD_LEFT
22 - KEYCODE_DPAD_RIGHT
23 - KEYCODE_DPAD_CENTER
24 - KEYCODE_VOLUME_UP
25 - KEYCODE_VOLUME_DOWN
26 - KEYCODE_POWER
27 - KEYCODE_CAMERA
28 - KEYCODE_CLEAR
29 - KEYCODE_A
30 - KEYCODE_B
31 - KEYCODE_C
32 - KEYCODE_D
33 - KEYCODE_E
34 - KEYCODE_F
35 - KEYCODE_G
36 - KEYCODE_H
37 - KEYCODE_I
38 - KEYCODE_J
39 - KEYCODE_K
40 - KEYCODE_L
41 - KEYCODE_M
42 - KEYCODE_N
43 - KEYCODE_O
44 - KEYCODE_P
45 - KEYCODE_Q
46 - KEYCODE_R
47 - KEYCODE_S
48 - KEYCODE_T
49 - KEYCODE_U
50 - KEYCODE_V
51 - KEYCODE_W
52 - KEYCODE_X
53 - KEYCODE_Y
54 - KEYCODE_Z
55 - KEYCODE_COMMA
56 - KEYCODE_PERIOD
57 - KEYCODE_ALT_LEFT
58 - KEYCODE_ALT_RIGHT
59 - KEYCODE_SHIFT_LEFT
60 - KEYCODE_SHIFT_RIGHT
61 - KEYCODE_TAB
62 - KEYCODE_SPACE
63 - KEYCODE_SYM
64 - KEYCODE_EXPLORER
65 - KEYCODE_ENVELOPE
66 - KEYCODE_ENTER
67 - KEYCODE_DEL
68 - KEYCODE_GRAVE
69 - KEYCODE_MINUS
70 - KEYCODE_EQUALS
71 - KEYCODE_LEFT_BRACKET
72 - KEYCODE_RIGHT_BRACKET
73 - KEYCODE_BACKSLASH
74 - KEYCODE_SEMICOLON
75 - KEYCODE_APOSTROPHE
76 - KEYCODE_SLASH
77 - KEYCODE_AT
78 - KEYCODE_NUM
79 - KEYCODE_HEADSETHOOK
80 - KEYCODE_FOCUS
81 - KEYCODE_PLUS
82 - KEYCODE_MENU
83 - KEYCODE_NOTIFICATION
84 - KEYCODE_SEARCH
85 - TAG_LAST_KEYCODE
