HP Jornada 680 Backlight Driver

modulename: hp680_bl.ko

configname: CONFIG_BACKLIGHT_HP680

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Backlight & LCD device support
└─>HP Jornada 680 Backlight Driver
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you have a HP Jornada 680, say y to enable the
backlight driver.

source code:
drivers/video/backlight/hp680_bl.c