Calibration data generally consists of factory-set values (stored in One-Time Programmable memory or external EEPROM) or dynamic values generated by the OS (e.g., the "Tablet PC Settings" calibration tool).
On reboot, EvtDevicePrepareHardware reads this property. If present, your driver sends a Feature Report to the I2C device to inject these coefficients before touch reporting starts. kmdf hid minidriver for touch i2c device calibration best
Before discussing calibration, you must understand why KMDF + HID over I2C is the gold standard. EvtDevicePrepareHardware reads this property. If present