[PATCH v4 8/10] HID: multitouch: add device ID for Apple Touch Bars

[Aditya Garg]

From: Kerem Karabay <kekrby at gmail.com>

Note that this is device ID is for T2 Macs. Testing on T1 Macs would be
appreciated.

Signed-off-by: Kerem Karabay <kekrby at gmail.com>
Signed-off-by: Aditya Garg <gargaditya08 at live.com>
---
 drivers/hid/Kconfig          |  1 +
 drivers/hid/hid-multitouch.c | 26 ++++++++++++++++++++++----
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 72b665eda..35ef5d4ef 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -744,6 +744,7 @@ config HID_MULTITOUCH
 	  Say Y here if you have one of the following devices:
 	  - 3M PCT touch screens
 	  - ActionStar dual touch panels
+	  - Touch Bars on x86 MacBook Pros
 	  - Atmel panels
 	  - Cando dual touch panels
 	  - Chunghwa panels
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 2948fbcbc..0fed95536 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -214,6 +214,7 @@ static void mt_post_parse(struct mt_device *td, struct mt_application *app);
 #define MT_CLS_GOOGLE				0x0111
 #define MT_CLS_RAZER_BLADE_STEALTH		0x0112
 #define MT_CLS_SMART_TECH			0x0113
+#define MT_CLS_APPLE_TOUCHBAR			0x0114
 
 #define MT_DEFAULT_MAXCONTACT	10
 #define MT_MAX_MAXCONTACT	250
@@ -398,6 +399,13 @@ static const struct mt_class mt_classes[] = {
 			MT_QUIRK_CONTACT_CNT_ACCURATE |
 			MT_QUIRK_SEPARATE_APP_REPORT,
 	},
+	{ .name = MT_CLS_APPLE_TOUCHBAR,
+		.quirks = MT_QUIRK_HOVERING |
+			MT_QUIRK_TOUCH_IS_TIPSTATE |
+			MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE,
+		.is_direct = true,
+		.maxcontacts = 11,
+	},
 	{ }
 };
 
@@ -1747,6 +1755,15 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		}
 	}
 
+	ret = hid_parse(hdev);
+	if (ret != 0)
+		return ret;
+
+	if (mtclass->name == MT_CLS_APPLE_TOUCHBAR &&
+	    !hid_find_field(hdev, HID_INPUT_REPORT,
+			    HID_DG_TOUCHPAD, HID_DG_TRANSDUCER_INDEX))
+		return -ENODEV;
+
 	td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
 	if (!td) {
 		dev_err(&hdev->dev, "cannot allocate multitouch data\n");
@@ -1794,10 +1811,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 	timer_setup(&td->release_timer, mt_expired_timeout, 0);
 
-	ret = hid_parse(hdev);
-	if (ret != 0)
-		return ret;
-
 	if (mtclass->quirks & MT_QUIRK_FIX_CONST_CONTACT_ID)
 		mt_fix_const_fields(hdev, HID_DG_CONTACTID);
 
@@ -2249,6 +2262,11 @@ static const struct hid_device_id mt_devices[] = {
 		MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 			USB_DEVICE_ID_XIROKU_CSR2) },
 
+	/* Apple Touch Bars */
+	{ .driver_data = MT_CLS_APPLE_TOUCHBAR,
+		HID_USB_DEVICE(USB_VENDOR_ID_APPLE,
+			       USB_DEVICE_ID_APPLE_TOUCHBAR_DISPLAY) },
+
 	/* Google MT devices */
 	{ .driver_data = MT_CLS_GOOGLE,
 		HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, USB_VENDOR_ID_GOOGLE,
-- 
2.43.0