Introduction
This plugin allows updating Touchpad devices from Elan. Devices are enumerated using HID and raw I²C nodes. The I²C mode is used for ABS devices and firmware recovery of HID devices.
Firmware Format
The daemon will decompress the cabinet archive and extract a firmware blob in an unspecified binary file format.
This plugin supports the following protocol ID:
tw.com.emc.elantp
GUID Generation
These device uses the standard DeviceInstanceId values, e.g.
HIDRAW\VEN_04F3&DEV_3010
Additionally another instance ID is added which corresponds to the module ID:
HIDRAW\VEN_04F3&DEV_3010&MOD_1234
These devices also use custom GUID values for the IC configuration, e.g.
ELANTP\ICTYPE_09
Additionally another instance ID is added which corresponds to the IC type & module ID:
ELANTP\ICTYPE_09&MOD_1234
Additionally another instance ID is added which corresponds to the IC Type & module ID and Driver in order to distinguish HID/ABS devices:
ELANTP\ICTYPE_09&MOD_1234&DRIVER_HID-> HID DeviceELANTP\ICTYPE_09&MOD_1234&DRIVER_ELAN_I2C-> ABS Device
Update Behavior
The device usually presents in HID/ABS mode, and the firmware is written to the device by switching to a IAP mode where the touchpad is nonfunctional. Once complete the device is reset to get out of IAP mode and to load the new firmware version.
For HID devices, on flash failure the device is nonfunctional, but is recoverable by writing to the i2c device. This is typically much slower than updating the device using HID and also requires a model-specific HWID quirk to match.
For ABS devices, on flash failure the device is nonfunctional, but it could be recovered by the same i2c device.
Vendor ID Security
The vendor ID is set from the HID vendor, for example set to HIDRAW:0x17EF
Quirk Use
This plugin uses the following plugin-specific quirks:
ElantpIcPageCount
The IC page count.
Since: 1.4.6
ElantpIapPassword
The IAP password.
Since: 1.4.6
External Interface Access
This plugin requires ioctl access to HIDIOCSFEATURE and HIDIOCGFEATURE.