The lines you posted are never executed with certain touchpads, look
right above them:
if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
synaptics_image_sensor_process(psmouse, &hw);
return;
}
synaptics_image_sensor_process() uses synaptics_report_slot() to send
the events to the userspace. The last patch I posted makes
synaptics_report_slot() send ABS_TOOL_WIDTH.
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https://bugs.launchpad.net/bugs/1245328
Title:
Synaptics kernel driver does not report finger width information,
breaking usermode driver's palm detection
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