CONFIG_SAMSUNG_DEV_KEYPAD is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_SAMSUNG_DEV_KEYPAD (not configurable)

modulename: dev-keypad.ko

configname: CONFIG_SAMSUNG_DEV_KEYPAD

Linux Kernel Configuration
└─>SAMSUNG_DEV_KEYPAD
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
Compile in platform device definitions for keypad

source code:
depends
CONFIG_PLAT_SAMSUNG |
| CONFIG_SAMSUNG_ATAGS