ChromeOS EC Legacy Accelerometer Sensor

modulename: cros_ec_accel_legacy.ko

configname: CONFIG_IIO_CROS_EC_ACCEL_LEGACY

Linux Kernel Configuration
└─>Device Drivers
└─>Industrial I/O support
└─>Accelerometers
└─>ChromeOS EC Legacy Accelerometer Sensor
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Say yes here to get support for accelerometers on Chromebook using
legacy EC firmware.
Sensor data is retrieved through IO memory.
Newer devices should use IIO_CROS_EC_SENSORS.

source code:
drivers/iio/accel/cros_ec_accel_legacy.c