HID: roccat: fix special button support

Added new data and changed workaround for abnormal button behaviour
according to new gained knowledge about Roccat Kone device.
Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-roccat-kone.c

@@ -928,14 +928,15 @@ static int kone_raw_event(struct hid_device *hdev, struct hid_report *report,
 		return 0;
 
 	/*
-	 * Firmware 1.38 introduced new behaviour for tilt buttons.
-	 * Pressed tilt button is reported in each movement event.
+	 * Firmware 1.38 introduced new behaviour for tilt and special buttons.
+	 * Pressed button is reported in each movement event.
 	 * Workaround sends only one event per press.
 	 */
-	if (kone->last_tilt_state == event->tilt)
-		event->tilt = 0;
+	if (memcmp(&kone->last_mouse_event.tilt, &event->tilt, 5))
+		memcpy(&kone->last_mouse_event, event,
+				sizeof(struct kone_mouse_event));
 	else
-		kone->last_tilt_state = event->tilt;
+		memset(&event->tilt, 0, 5);
 
 	/*
 	 * handle special events and keep actual profile and dpi values

drivers/hid/hid-roccat-kone.h

@@ -83,6 +83,17 @@ enum kone_button_info_types {
 	kone_button_info_type_multimedia_volume_down = 0x27
 };
 
+enum kone_button_info_numbers {
+	kone_button_top = 1,
+	kone_button_wheel_tilt_left = 2,
+	kone_button_wheel_tilt_right = 3,
+	kone_button_forward = 4,
+	kone_button_backward = 5,
+	kone_button_middle = 6,
+	kone_button_plus = 7,
+	kone_button_minus = 8,
+};
+
 struct kone_light_info {
 	uint8_t number; /* number of light 1-5 */
 	uint8_t mod;   /* 1 = on, 2 = off */
@@ -120,6 +131,7 @@ struct kone_profile {
 	uint8_t light_effect_speed; /* range 0-255 */
 
 	struct kone_light_info light_infos[5];
+	/* offset is kone_button_info_numbers - 1 */
 	struct kone_button_info button_infos[8];
 
 	uint16_t checksum; /* \brief holds checksum of struct */
@@ -165,7 +177,7 @@ enum kone_mouse_events {
 	/* TODO clarify meaning and occurence of kone_mouse_event_calibration */
 	kone_mouse_event_calibration = 0xc0,
 	kone_mouse_event_call_overlong_macro = 0xe0,
-	/* switch events notify if user changed values wiht mousebutton click */
+	/* switch events notify if user changed values with mousebutton click */
 	kone_mouse_event_switch_dpi = 0xf0,
 	kone_mouse_event_switch_profile = 0xf1
 };
@@ -188,8 +200,9 @@ struct kone_device {
 	 * is no way of getting this information from the device on demand
 	 */
 	int actual_profile, actual_dpi;
-	/* Used for neutralizing abnormal tilt button behaviour */
-	int last_tilt_state;
+	/* Used for neutralizing abnormal button behaviour */
+	struct kone_mouse_event last_mouse_event;
+
 	/*
 	 * It's unlikely that multiple sysfs attributes are accessed at a time,
 	 * so only one mutex is used to secure hardware access and profiles and