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Revert "HID: input: simplify/fix high-res scroll event handling"

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This reverts commit 044ee89028.

It turns out the current API is not that compatible with
some Microsoft mice, so better start again from scratch.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Harry Cutts <hcutts@chromium.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2018-11-21 16:27:06 +01:00
parent fb862c3b19
commit e2b95b2719
1 changed files with 22 additions and 21 deletions
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43
drivers/hid/hid-input.c
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@ -1858,30 +1858,31 @@ EXPORT_SYMBOL_GPL(hidinput_disconnect);
void hid_scroll_counter_handle_scroll(struct hid_scroll_counter *counter,
int hi_res_value)
{
int low_res_value, remainder, multiplier;
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);
/*
* Update the low-res remainder with the high-res value,
* but reset if the direction has changed.
*/
remainder = counter->remainder;
if ((remainder ^ hi_res_value) < 0)
remainder = 0;
remainder += hi_res_value;
/*
* Then just use the resolution multiplier to see if
* we should send a low-res (aka regular wheel) event.
*/
multiplier = counter->resolution_multiplier;
low_res_value = remainder / multiplier;
remainder -= low_res_value * multiplier;
counter->remainder = remainder;
if (low_res_value)
input_report_rel(counter->dev, REL_WHEEL, low_res_value);
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);