Revert "HID: input: Create a utility class for counting scroll events"
[sfrench/cifs-2.6.git] / drivers / hid / hid-input.c
index 28ee2ed88a1aea85491be0acf8ba5a578b415530..d6fab579848743555c53534ad933419ad69318a9 100644 (file)
@@ -1841,48 +1841,3 @@ void hidinput_disconnect(struct hid_device *hid)
 }
 EXPORT_SYMBOL_GPL(hidinput_disconnect);
 
-/**
- * hid_scroll_counter_handle_scroll() - Send high- and low-resolution scroll
- *                                      events given a high-resolution wheel
- *                                      movement.
- * @counter: a hid_scroll_counter struct describing the wheel.
- * @hi_res_value: the movement of the wheel, in the mouse's high-resolution
- *                units.
- *
- * Given a high-resolution movement, this function converts the movement into
- * microns and emits high-resolution scroll events for the input device. It also
- * uses the multiplier from &struct hid_scroll_counter to emit low-resolution
- * scroll events when appropriate for backwards-compatibility with userspace
- * input libraries.
- */
-void hid_scroll_counter_handle_scroll(struct hid_scroll_counter *counter,
-                                     int hi_res_value)
-{
-       int low_res_scroll_amount;
-       /* Some wheels will rest 7/8ths of a notch from the previous notch
-        * after slow movement, so we want the threshold for low-res events to
-        * be in the middle of the notches (e.g. after 4/8ths) as opposed to on
-        * the notches themselves (8/8ths).
-        */
-       int threshold = counter->resolution_multiplier / 2;
-
-       input_report_rel(counter->dev, REL_WHEEL_HI_RES,
-                        hi_res_value * counter->microns_per_hi_res_unit);
-
-       counter->remainder += hi_res_value;
-       if (abs(counter->remainder) >= threshold) {
-               /* Add (or subtract) 1 because we want to trigger when the wheel
-                * is half-way to the next notch (i.e. scroll 1 notch after a
-                * 1/2 notch movement, 2 notches after a 1 1/2 notch movement,
-                * etc.).
-                */
-               low_res_scroll_amount =
-                       counter->remainder / counter->resolution_multiplier
-                       + (hi_res_value > 0 ? 1 : -1);
-               input_report_rel(counter->dev, REL_WHEEL,
-                                low_res_scroll_amount);
-               counter->remainder -=
-                       low_res_scroll_amount * counter->resolution_multiplier;
-       }
-}
-EXPORT_SYMBOL_GPL(hid_scroll_counter_handle_scroll);