HID: pidff: Compute INFINITE value instead of using hardcoded 0xffff

As per USB PID standard:
INFINITE - Referrers to the maximum value of a range. i.e. if in an 8
bit unsigned field the value of 255 would indicate INFINITE.

Detecting 0xffff (U16_MAX) is still important as we MIGHT get this value
as infinite from some native software as 0 was never actually defined
in Linux' FF api as the infinite value. I'm working on it though.

Signed-off-by: Tomasz Pakuła <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: Lawstorant

drivers/hid/usbhid/hid-pidff.c

@@ -283,8 +283,9 @@ static void pidff_set_duration(struct pidff_usage *usage, u16 duration)
 	if (duration == FF_INFINITE)
 		duration = PID_INFINITE;
 
+	/* PID defines INFINITE as the max possible value for duration field */
 	if (duration == PID_INFINITE) {
-		usage->value[0] = PID_INFINITE;
+		usage->value[0] = (1U << usage->field->report_size) - 1;
 		return;
 	}