HID: magicmouse: enable horizontal scrolling

Mimicks OS X behavior.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 19 insertions, 6 deletions

diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index fe0c760d7e6e..0b89c1cf9ec4 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -95,6 +95,7 @@ struct magicmouse_sc {
         struct {
                 short x;
                 short y;
+                short scroll_x;
                 short scroll_y;
                 u8 size;
         } touches[16];
@@ -181,11 +182,13 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
          */
         if (emulate_scroll_wheel) {
                 unsigned long now = jiffies;
-                int step = msc->touches[id].scroll_y - y;
+                int step_x = msc->touches[id].scroll_x - x;
+                int step_y = msc->touches[id].scroll_y - y;
 
                 /* Calculate and apply the scroll motion. */
                 switch (tdata[7] & TOUCH_STATE_MASK) {
                 case TOUCH_STATE_START:
+                        msc->touches[id].scroll_x = x;
                         msc->touches[id].scroll_y = y;
 
                         /* Reset acceleration after half a second. */
@@ -198,12 +201,20 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
 
                         break;
                 case TOUCH_STATE_DRAG:
-                        step /= (64 - (int)scroll_speed) * msc->scroll_accel;
-                        if (step != 0) {
-                                msc->touches[id].scroll_y -= step *
+                        step_x /= (64 - (int)scroll_speed) * msc->scroll_accel;
+                        if (step_x != 0) {
+                                msc->touches[id].scroll_x -= step_x *
                                         (64 - scroll_speed) * msc->scroll_accel;
                                 msc->scroll_jiffies = now;
-                                input_report_rel(input, REL_WHEEL, step);
+                                input_report_rel(input, REL_HWHEEL, -step_x);
+                        }
+
+                        step_y /= (64 - (int)scroll_speed) * msc->scroll_accel;
+                        if (step_y != 0) {
+                                msc->touches[id].scroll_y -= step_y *
+                                        (64 - scroll_speed) * msc->scroll_accel;
+                                msc->scroll_jiffies = now;
+                                input_report_rel(input, REL_WHEEL, step_y);
                         }
                         break;
                 }
@@ -318,8 +329,10 @@ static void magicmouse_setup_input(struct input_dev *input, struct hid_device *h
         __set_bit(EV_REL, input->evbit);
         __set_bit(REL_X, input->relbit);
         __set_bit(REL_Y, input->relbit);
-        if (emulate_scroll_wheel)
+        if (emulate_scroll_wheel) {
                 __set_bit(REL_WHEEL, input->relbit);
+                __set_bit(REL_HWHEEL, input->relbit);
+        }
 
         if (report_touches) {
                 __set_bit(EV_ABS, input->evbit);