Hi,

On 10-06-16 12:21, Ben Gamari wrote:

Hans de Goede [off-list ref] writes:

quoted

Hi,

quoted

@@ -2996,6 +2999,10 @@ int alps_init(struct psmouse *psmouse)

 		input_set_capability(dev2, EV_REL, REL_X);
 		input_set_capability(dev2, EV_REL, REL_Y);
+		if (priv->flags & ALPS_DUALPOINT_WITH_PRESSURE) {
+			input_set_capability(dev2, EV_ABS, ABS_PRESSURE);
+			input_set_abs_params(dev2, ABS_PRESSURE, 0, 127, 0, 0);
+		}
 		input_set_capability(dev2, EV_KEY, BTN_LEFT);
 		input_set_capability(dev2, EV_KEY, BTN_RIGHT);
 		input_set_capability(dev2, EV_KEY, BTN_MIDDLE);

This seems wrong, reporting ABS_PRESSURE on a relative device. And yes, this
really is a relative device (it sends repeated delta events when you
keep pushing at the same force, rather then sending a single coordinate
value).

Maybe we need a REL_PRESSURE for cases like this ?

Fair enough. However, if such a thing were added how would one specify
the range of the value (which seems necessary for the pressure to have
any meaning whatsoever)?

Good question, adding Peter Hutterer to the Cc.

Peter, some of the newer alps pointing sticks can also report pressure,
which is somewhat of an ill fit for the relative events interface
otherwise used with pointing sticks, do you have any suggestions on
how to deal with this ?

Regards,

Hans