linux-kernel - [PATCH] HID: Wacom: switch Dell canvas into highres mode

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Date:   Fri,  3 Nov 2017 18:29:47 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>, Ping Cheng <pinglinux@...il.com>,
        Jason Gerecke <killertofu@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH] HID: Wacom: switch Dell canvas into highres mode

The Dell Canvas exports 2 collections for the Pen part. The only
difference between the 2 is that the default one has half the resolution
of the second one.

The Windows driver switches the tablet into the second mode, so we should
behave the same.

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

Hi,

well, this is not the cleanest way of handling this mode set, but it is the
less intrusive AFAICT.

I was thinking that we might want to add a new field in struct wacom_feature,
but then it wouldn't make sense to keep the set mode specifics in
_wacom_query_tablet_data().

So I am open to any better suggestion, but this one works and the impact on
other HID generic tablets is null.

Cheers,
Benjamin

 drivers/hid/wacom_sys.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 906e654fb0ba..ee71ad9b6cc1 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -196,6 +196,13 @@ static void wacom_feature_mapping(struct hid_device *hdev,
 		kfree(data);
 		break;
 	}
+
+	if (hdev->vendor == USB_VENDOR_ID_WACOM &&
+	    hdev->product == 0x4200 /* Dell Canvas 27 */ &&
+	    field->application == HID_UP_MSVENDOR) {
+		wacom->wacom_wac.mode_report = field->report->id;
+		wacom->wacom_wac.mode_value = 2;
+	}
 }

 /*
-- 
2.14.3