Loading Touch Driver as a Module

Loading the Touch Driver as a Module

The touch driver can be configured to be built in with the kernel image or as a module to be loaded later.

Note that if the maXTouch device configuration is to be loaded on a driver probe, the driver must be compiled as a module

Before the kernel is built, the defconfig file should be modified to create a driver module (atmel_mst_ts.ko):

CONFIG_TOUCHSCREEN_ATMEL_MXT=m

After the driver module is built, the user can install the module using the following command:

insmod /sys/lib/modules/atmel_mxt_ts.ko

The following commands can be used to ensure the correct permissions are set up for the driver module once it is installed:

chmod 0777 /sys/bus/i2c/drivers/atmel_mxt_ts/1-004b/debug_enable
chmod 0777 /sys/bus/i2c/drivers/atmel_mxt_ts/1-004b/mem_access
write /proc/sys/kernel/dmesg_restrict 0

The chmod and dmesg_restrict lines are used to allow debug access to the chip during integration and debugging.

Permissions should be restored for production unless debug access is required at all times.