HID: multitouch: Add support for Google Rose Touchpad

Add Google Rose Touchpad USB PID and required quirks.
Signed-off-by: NWei-Ning Huang <wnhuang@chromium.org>
Reviewed-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-ids.h

@@ -427,6 +427,9 @@
 #define USB_VENDOR_ID_GOODTOUCH		0x1aad
 #define USB_DEVICE_ID_GOODTOUCH_000f	0x000f
 
+#define USB_VENDOR_ID_GOOGLE		0x18d1
+#define USB_DEVICE_ID_GOOGLE_TOUCH_ROSE	0x5028
+
 #define USB_VENDOR_ID_GOTOP		0x08f2
 #define USB_DEVICE_ID_SUPER_Q2		0x007f
 #define USB_DEVICE_ID_GOGOPEN		0x00ce

drivers/hid/hid-multitouch.c

@@ -162,6 +162,7 @@ static void mt_post_parse(struct mt_device *td);
 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS	0x0109
 #define MT_CLS_LG				0x010a
 #define MT_CLS_VTL				0x0110
+#define MT_CLS_GOOGLE				0x0111
 
 #define MT_DEFAULT_MAXCONTACT	10
 #define MT_MAX_MAXCONTACT	250
@@ -285,6 +286,12 @@ static struct mt_class mt_classes[] = {
 			MT_QUIRK_CONTACT_CNT_ACCURATE |
 			MT_QUIRK_FORCE_GET_FEATURE,
 	},
+	{ .name = MT_CLS_GOOGLE,
+		.quirks = MT_QUIRK_ALWAYS_VALID |
+			MT_QUIRK_CONTACT_CNT_ACCURATE |
+			MT_QUIRK_SLOT_IS_CONTACTID |
+			MT_QUIRK_HOVERING
+	},
 	{ }
 };
 
@@ -1588,6 +1595,11 @@ static const struct hid_device_id mt_devices[] = {
 		MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 			USB_DEVICE_ID_XIROKU_CSR2) },
 
+	/* Google MT devices */
+	{ .driver_data = MT_CLS_GOOGLE,
+		HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, USB_VENDOR_ID_GOOGLE,
+			USB_DEVICE_ID_GOOGLE_TOUCH_ROSE) },
+
 	/* Generic MT device */
 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },