[PATCH] Series-to: LKML <linux-kernel@xxxxxxxxxxxxxxx>

[Torsha Banerjee]

From: Jora Jacobi <jora@xxxxxxxxxx>

Restore missing cursor for digitizer devices

A previously committed patch to remove cursors for HID Digitizer-Pen
devices also removed the cursors for some tablets which have incorrect HID
descriptors. These devices should enumerate with Usage ID "Digitizer"
instead of Usage ID "Pen".

Patch which introduced the issue: commit 8473a93d1ba5
("HID: input: Set INPUT_PROP_-property for HID_UP_DIGITIZERS")

Changes-
Add HID quirk HID_QUIRK_DEVICE_IS_DIGITIZER
Quirk will force INPUT_PROP_POINTER for HID Digitizers
Apply quirk to Huion tablets
Apply quirk to UGEE/XP-Pen tablets based on device ID

Tested with Huion H640P and H430P. Connected the digitizer to the
Chromebook and confirmed with a drawing program that the cursor appears and
moves when the digitizer's stylus is hovering over the surface of the
digitizer.

Signed-off-by: Jora Jacobi <jora@xxxxxxxxxx>
Reviewed-by: Harry Cutts <hcutts@xxxxxxxxxxxx>
Signed-off-by: Torsha Banerjee <torsha@xxxxxxxxxx>
---

 drivers/hid/hid-input.c  | 3 ++-
 drivers/hid/hid-quirks.c | 9 +++++++++
 include/linux/hid.h      | 1 +
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 7fc967964dd8..f0c67baddc8d 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -927,7 +927,8 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 		break;
 
 	case HID_UP_DIGITIZER:
-		if ((field->application & 0xff) == 0x01) /* Digitizer */
+		if (((field->application & 0xff) == 0x01) ||
+			(device->quirks & HID_QUIRK_DEVICE_IS_DIGITIZER)) /* Digitizer */
 			__set_bit(INPUT_PROP_POINTER, input->propbit);
 		else if ((field->application & 0xff) == 0x02) /* Pen */
 			__set_bit(INPUT_PROP_DIRECT, input->propbit);
diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c
index 66e64350f138..094fe4c4f3b3 100644
--- a/drivers/hid/hid-quirks.c
+++ b/drivers/hid/hid-quirks.c
@@ -102,6 +102,8 @@ static const struct hid_device_id hid_quirks[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HP, USB_PRODUCT_ID_HP_PIXART_OEM_USB_OPTICAL_MOUSE_0941), HID_QUIRK_ALWAYS_POLL },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HP, USB_PRODUCT_ID_HP_PIXART_OEM_USB_OPTICAL_MOUSE_0641), HID_QUIRK_ALWAYS_POLL },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HP, USB_PRODUCT_ID_HP_PIXART_OEM_USB_OPTICAL_MOUSE_1f4a), HID_QUIRK_ALWAYS_POLL },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION, USB_DEVICE_ID_HUION_HS64), HID_QUIRK_DEVICE_IS_DIGITIZER },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION, USB_DEVICE_ID_HUION_TABLET), HID_QUIRK_DEVICE_IS_DIGITIZER },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_IDEACOM, USB_DEVICE_ID_IDEACOM_IDC6680), HID_QUIRK_MULTI_INPUT },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_INNOMEDIA, USB_DEVICE_ID_INNEX_GENESIS_ATARI), HID_QUIRK_MULTI_INPUT },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_EASYPEN_M610X), HID_QUIRK_MULTI_INPUT },
@@ -1298,6 +1300,13 @@ unsigned long hid_lookup_quirk(const struct hid_device *hdev)
 		quirks = hid_gets_squirk(hdev);
 	mutex_unlock(&dquirks_lock);
 
+	/*
+	 * UGEE/XP-Pen HID Pen devices which have 0x0-0x9 as the low nibble
+	 * of the device ID are actually digitizers, not HID Pen devices
+	 */
+	if (hdev->vendor == USB_VENDOR_ID_UGEE && (hdev->product & 0x0F) <= 0x09)
+		quirks |= HID_QUIRK_DEVICE_IS_DIGITIZER;
+
 	return quirks;
 }
 EXPORT_SYMBOL_GPL(hid_lookup_quirk);
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 1ea8c7a3570b..1653359002b3 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -354,6 +354,7 @@ struct hid_item {
 #define HID_QUIRK_INPUT_PER_APP			BIT(11)
 #define HID_QUIRK_X_INVERT			BIT(12)
 #define HID_QUIRK_Y_INVERT			BIT(13)
+#define HID_QUIRK_DEVICE_IS_DIGITIZER           BIT(14)
 #define HID_QUIRK_SKIP_OUTPUT_REPORTS		BIT(16)
 #define HID_QUIRK_SKIP_OUTPUT_REPORT_ID		BIT(17)
 #define HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP	BIT(18)
-- 
2.40.0.348.gf938b09366-goog