HSI/SSI character driver

modulename: hsi_char.ko

configname: CONFIG_HSI_CHAR

Linux Kernel Configuration
└─>Device Drivers
└─>HSI support
└─>HSI/SSI character driver
In linux kernel since version 3.1 (release Date: 2011-10-24)  
If you say Y here, you will enable the HSI/SSI character driver.
This driver provides a simple character device interface for
serial communication with the cellular modem over HSI/SSI bus.

source code:
depends
CONFIG_HSI