linux-kernel - [PATCH v2 5/6] HID: uclogic: discard the extra Pen input node on Huion tablets

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Message-Id: <1424977049-18648-6-git-send-email-benjamin.tissoires@redhat.com>
Date:	Thu, 26 Feb 2015 13:57:28 -0500
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Nikolai Kondrashov <spbnick@...il.com>,
	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	DIGImend-devel <DIGImend-devel@...ts.sourceforge.net>
Subject: [PATCH v2 5/6] HID: uclogic: discard the extra Pen input node on Huion tablets

Some Huion tablets present 2 HID Pen interfaces. Only one is used, so
we can drop the unused one.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---

New in v2

 drivers/hid/hid-uclogic.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/hid/hid-uclogic.c b/drivers/hid/hid-uclogic.c
index ada8a94..f44e72b 100644
--- a/drivers/hid/hid-uclogic.c
+++ b/drivers/hid/hid-uclogic.c
@@ -713,6 +713,25 @@ static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 	return rdesc;
 }
 
+static int uclogic_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+		struct hid_field *field, struct hid_usage *usage,
+		unsigned long **bit, int *max)
+{
+	struct usb_interface *intf;
+
+	if (hdev->product == USB_DEVICE_ID_HUION_TABLET) {
+		intf = to_usb_interface(hdev->dev.parent);
+
+		/* discard the unused pen interface */
+		if ((intf->cur_altsetting->desc.bInterfaceNumber != 0) &&
+		    (field->application == HID_DG_PEN))
+			return -1;
+	}
+
+	/* let hid-core decide what to do */
+	return 0;
+}
+
 static void uclogic_input_configured(struct hid_device *hdev,
 		struct hid_input *hi)
 {
@@ -947,6 +966,7 @@ static struct hid_driver uclogic_driver = {
 	.probe = uclogic_probe,
 	.report_fixup = uclogic_report_fixup,
 	.raw_event = uclogic_raw_event,
+	.input_mapping = uclogic_input_mapping,
 	.input_configured = uclogic_input_configured,
 };
 module_hid_driver(uclogic_driver);
-- 
2.1.0

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