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>

3 files changed, 22 insertions, 3 deletions

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 8c4c908..de270b1 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -902,9 +902,10 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 			map_key(BTN_1);
 	}
 
-	if ((device->quirks & (HID_QUIRK_2WHEEL_MOUSE_HACK_7 | HID_QUIRK_2WHEEL_MOUSE_HACK_5)) &&
-		 (usage->type == EV_REL) && (usage->code == REL_WHEEL))
-			set_bit(REL_HWHEEL, bit);
+	if ((device->quirks & (HID_QUIRK_2WHEEL_MOUSE_HACK_7 | HID_QUIRK_2WHEEL_MOUSE_HACK_5 |
+			HID_QUIRK_2WHEEL_MOUSE_HACK_B8)) && (usage->type == EV_REL) &&
+			(usage->code == REL_WHEEL))
+		set_bit(REL_HWHEEL, bit);
 
 	if (((device->quirks & HID_QUIRK_2WHEEL_MOUSE_HACK_5) && (usage->hid == 0x00090005))
 		|| ((device->quirks & HID_QUIRK_2WHEEL_MOUSE_HACK_7) && (usage->hid == 0x00090007)))
@@ -1002,6 +1003,19 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 		return;
 	}
 
+	if ((hid->quirks & HID_QUIRK_2WHEEL_MOUSE_HACK_B8) &&
+			(usage->type == EV_REL) &&
+			(usage->code == REL_WHEEL)) {
+		hid->delayed_value = value;
+		return;
+	}
+
+	if ((hid->quirks & HID_QUIRK_2WHEEL_MOUSE_HACK_B8) &&
+			(usage->hid == 0x000100b8)) {
+		input_event(input, EV_REL, value ? REL_HWHEEL : REL_WHEEL, hid->delayed_value);
+		return;
+	}
+
 	if ((hid->quirks & HID_QUIRK_INVERT_HWHEEL) && (usage->code == REL_HWHEEL)) {
 		input_event(input, usage->type, usage->code, -value);
 		return;
diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
index 3304b0a..836b06a 100644
--- a/drivers/hid/usbhid/hid-quirks.c
+++ b/drivers/hid/usbhid/hid-quirks.c
@@ -19,6 +19,7 @@
 
 #define USB_VENDOR_ID_A4TECH		0x09da
 #define USB_DEVICE_ID_A4TECH_WCP32PU	0x0006
+#define USB_DEVICE_ID_A4TECH_X5_005D	0x000a
 
 #define USB_VENDOR_ID_AASHIMA		0x06d6
 #define USB_DEVICE_ID_AASHIMA_GAMEPAD	0x0025
@@ -371,6 +372,7 @@ static const struct hid_blacklist {
 } hid_blacklist[] = {
 
 	{ USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU, HID_QUIRK_2WHEEL_MOUSE_HACK_7 },
+	{ USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D, HID_QUIRK_2WHEEL_MOUSE_HACK_B8 },
 	{ USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE, HID_QUIRK_2WHEEL_MOUSE_HACK_5 },
 
 	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RECEIVER, HID_QUIRK_BAD_RELATIVE_KEYS },
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 833f2af..991bbcd 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 *);