[PATCH 1/2] HID: magicmouse: enable high-resolution scroll
flat view
STALE1914d
From: José Expósito <hidden>
Date: 2021-07-07 15:59:00
Also in:
lkml
Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
The Magic Mouse, generations 1 and 2, doesn't have a physical scroll wheel, instead, the REL_WHEEL and REL_HWHEEL events are emulated when sliding a finger on the surface of the mouse. However, the smooth movement of the finger is transformed into a step based scroll on the screen, leading to a suboptimal user experience. Emulate high-resolution scroll by sending REL_WHEEL_HI_RES and REL_HWHEEL_HI_RES events so the scroll on the screen is closer to the finger movement. Signed-off-by: José Expósito <redacted> --- drivers/hid/hid-magicmouse.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index 8bcaee4ccae0..e95f46dab4ad 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c@@ -68,6 +68,9 @@ MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state fie #define TOUCH_STATE_START 0x30 #define TOUCH_STATE_DRAG 0x40 +/* Number of high-resolution events for each low-resolution detent. */ +#define SCROLL_HR_STEPS 10 +#define SCROLL_HR_MULT (120 / SCROLL_HR_STEPS) #define SCROLL_ACCEL_DEFAULT 7 /* Touch surface information. Dimension is in hundredths of a mm, min and max
@@ -126,6 +129,8 @@ struct magicmouse_sc { short y; short scroll_x; short scroll_y; + short scroll_x_hr; + short scroll_y_hr; u8 size; } touches[16]; int tracking_ids[16];
@@ -248,12 +253,18 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda unsigned long now = jiffies; int step_x = msc->touches[id].scroll_x - x; int step_y = msc->touches[id].scroll_y - y; + int step_hr = ((64 - (int)scroll_speed) * msc->scroll_accel) / + SCROLL_HR_STEPS; + int step_x_hr = msc->touches[id].scroll_x_hr - x; + int step_y_hr = msc->touches[id].scroll_y_hr - y; /* Calculate and apply the scroll motion. */ switch (state) { case TOUCH_STATE_START: msc->touches[id].scroll_x = x; msc->touches[id].scroll_y = y; + msc->touches[id].scroll_x_hr = x; + msc->touches[id].scroll_y_hr = y; /* Reset acceleration after half a second. */ if (scroll_acceleration && time_before(now,
@@ -280,6 +291,24 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda msc->scroll_jiffies = now; input_report_rel(input, REL_WHEEL, step_y); } + + step_x_hr /= step_hr; + if (step_x_hr != 0) { + msc->touches[id].scroll_x_hr -= step_x_hr * + step_hr; + input_report_rel(input, + REL_HWHEEL_HI_RES, + -step_x_hr * SCROLL_HR_MULT); + } + + step_y_hr /= step_hr; + if (step_y_hr != 0) { + msc->touches[id].scroll_y_hr -= step_y_hr * + step_hr; + input_report_rel(input, + REL_WHEEL_HI_RES, + step_y_hr * SCROLL_HR_MULT); + } break; } }
@@ -481,6 +510,8 @@ static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hd if (emulate_scroll_wheel) { __set_bit(REL_WHEEL, input->relbit); __set_bit(REL_HWHEEL, input->relbit); + __set_bit(REL_WHEEL_HI_RES, input->relbit); + __set_bit(REL_HWHEEL_HI_RES, input->relbit); } } else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) { /* setting the device name to ensure the same driver settings
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2.25.1