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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
To: "Jiri Kosina" <jikos@kernel.org>,
	"Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Ahelenia Ziemiańska" <nabijaczleweli@nabijaczleweli.xyz>,
	"Ping Cheng" <pinglinux@gmail.com>,
	"Aaron Armstrong Skomra" <skomra@gmail.com>,
	"Jason Gerecke" <killertofu@gmail.com>,
	"Peter Hutterer" <peter.hutterer@who-t.net>
Cc: linux-input@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Benjamin Tissoires <benjamin.tissoires@redhat.com>
Subject: [PATCH v2 06/12] HID: input: move up out-of-range processing of input values
Date: Thu,  3 Feb 2022 15:32:20 +0100	[thread overview]
Message-ID: <20220203143226.4023622-7-benjamin.tissoires@redhat.com> (raw)
In-Reply-To: <20220203143226.4023622-1-benjamin.tissoires@redhat.com>

It actually makes sense to clamp the value to its boundaries before
doing further processing.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
 drivers/hid/hid-input.c | 48 ++++++++++++++++++++---------------------
 1 file changed, 24 insertions(+), 24 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 54b3e9c5ccc4..8770d9a2b2af 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1364,6 +1364,30 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 		return;
 	}
 
+	/*
+	 * Ignore out-of-range values as per HID specification,
+	 * section 5.10 and 6.2.25, when NULL state bit is present.
+	 * When it's not, clamp the value to match Microsoft's input
+	 * driver as mentioned in "Required HID usages for digitizers":
+	 * https://msdn.microsoft.com/en-us/library/windows/hardware/dn672278(v=vs.85).asp
+	 *
+	 * The logical_minimum < logical_maximum check is done so that we
+	 * don't unintentionally discard values sent by devices which
+	 * don't specify logical min and max.
+	 */
+	if ((field->flags & HID_MAIN_ITEM_VARIABLE) &&
+	    field->logical_minimum < field->logical_maximum) {
+		if (field->flags & HID_MAIN_ITEM_NULL_STATE &&
+		    (value < field->logical_minimum ||
+		     value > field->logical_maximum)) {
+			dbg_hid("Ignoring out-of-range value %x\n", value);
+			return;
+		}
+		value = clamp(value,
+			      field->logical_minimum,
+			      field->logical_maximum);
+	}
+
 	switch (usage->hid) {
 	case HID_DG_INVERT:
 		*quirks = value ? (*quirks | HID_QUIRK_INVERT) : (*quirks & ~HID_QUIRK_INVERT);
@@ -1431,30 +1455,6 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 		break;
 	}
 
-	/*
-	 * Ignore out-of-range values as per HID specification,
-	 * section 5.10 and 6.2.25, when NULL state bit is present.
-	 * When it's not, clamp the value to match Microsoft's input
-	 * driver as mentioned in "Required HID usages for digitizers":
-	 * https://msdn.microsoft.com/en-us/library/windows/hardware/dn672278(v=vs.85).asp
-	 *
-	 * The logical_minimum < logical_maximum check is done so that we
-	 * don't unintentionally discard values sent by devices which
-	 * don't specify logical min and max.
-	 */
-	if ((field->flags & HID_MAIN_ITEM_VARIABLE) &&
-	    (field->logical_minimum < field->logical_maximum)) {
-		if (field->flags & HID_MAIN_ITEM_NULL_STATE &&
-		    (value < field->logical_minimum ||
-		     value > field->logical_maximum)) {
-			dbg_hid("Ignoring out-of-range value %x\n", value);
-			return;
-		}
-		value = clamp(value,
-			      field->logical_minimum,
-			      field->logical_maximum);
-	}
-
 	/*
 	 * Ignore reports for absolute data if the data didn't change. This is
 	 * not only an optimization but also fixes 'dead' key reports. Some
-- 
2.33.1


  parent reply	other threads:[~2022-02-03 14:33 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-03 14:32 [PATCH v2 00/12] HID: fix for generic input processing Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 01/12] HID: core: statically allocate read buffers Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 02/12] HID: core: de-duplicate some code in hid_input_field() Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 03/12] HID: core: split data fetching from processing " Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 04/12] HID: input: tag touchscreens as such if the physical is not there Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 05/12] HID: input: rework spaghetti code with switch statements Benjamin Tissoires
2022-02-03 14:32 ` Benjamin Tissoires [this message]
2022-02-03 14:32 ` [PATCH v2 07/12] HID: compute an ordered list of input fields to process Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 08/12] HID: core: for input reports, process the usages by priority list Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 09/12] HID: input: enforce Invert usage to be processed before InRange Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 10/12] HID: input: remove the need for HID_QUIRK_INVERT Benjamin Tissoires
2022-02-04  1:41   ` Ping Cheng
2022-02-10  5:21   ` Ping Cheng
2022-02-10  5:43     ` Ping Cheng
2022-02-14 10:23       ` Benjamin Tissoires
2022-02-15  2:04         ` Ping Cheng
2022-02-15  8:51           ` Benjamin Tissoires
2022-02-16 12:42             ` Benjamin Tissoires
2022-02-17  1:27               ` Ping Cheng
2022-02-03 14:32 ` [PATCH v2 11/12] HID: input: accommodate priorities for slotted devices Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 12/12] Input: docs: add more details on the use of BTN_TOOL Benjamin Tissoires
2022-02-16  5:40   ` Peter Hutterer
2022-03-01 14:53 ` [PATCH v2 00/12] HID: fix for generic input processing Jiri Kosina

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