HID: Implement horizontal wheel handling for A4 Tech X5-005D

This mouse distinguishes horizontal wheel from vertical by a special "pseudo
event" GenericDesktop.00b8, with values of 0 for vertical and 8 for horizontal
wheel. Because this event is supplied by the parser too late, we need to delay
a wheel event, wait for this one and send either REL_WHEEL or REL_HWHEEL to
input depending on the event value.

Signed-off-by: Pavel Troller <patrol@sinus.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/hid.h b/include/linux/hid.h
index 833f2af8aab9..991bbcdc1ca7 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -281,6 +281,7 @@ struct hid_item {
 #define HID_QUIRK_LOGITECH_IGNORE_DOUBLED_WHEEL 0x00400000
 #define HID_QUIRK_LOGITECH_EXPANDED_KEYMAP      0x00800000
 #define HID_QUIRK_IGNORE_HIDINPUT               0x01000000
+#define HID_QUIRK_2WHEEL_MOUSE_HACK_B8          0x02000000
 
 /*
  * Separate quirks for runtime report descriptor fixup
@@ -456,6 +457,8 @@ struct hid_device {							/* device report descriptor */
 
         void *driver_data;
 
+        __s32 delayed_value;                                            /* For A4 Tech mice hwheel quirk */
+
         /* device-specific function pointers */
         int (*hidinput_input_event) (struct input_dev *, unsigned int, unsigned int, int);
         int (*hid_open) (struct hid_device *);