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Subject[PATCH 1/2] HID: magicmouse: enable high-resolution scroll
Date
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 <jose.exposito89@gmail.com>
---
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
--
2.25.1
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