From: Nikolai Kondrashov <spbnick@gmail.com>
Date: Sun, 8 May 2022 16:01:43 +0000 (+0200)
Subject: HID: uclogic: Always shift touch reports to zero
X-Git-Tag: v5.19-rc1~184^2~1^2~3
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fbc08b4e8ea5582029dc3c05c954d4d157e4d3f8;p=thirdparty%2Fkernel%2Flinux.git

HID: uclogic: Always shift touch reports to zero

Always decrement touch report values to have the range start with zero,
regardless if flipped or not. This fixes the future non-flipped touch
strip reports.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---

diff --git a/drivers/hid/hid-uclogic-core.c b/drivers/hid/hid-uclogic-core.c
index cc53625ed1f74..c4ab94d58a0fb 100644
--- a/drivers/hid/hid-uclogic-core.c
+++ b/drivers/hid/hid-uclogic-core.c
@@ -386,15 +386,16 @@ static int uclogic_raw_event_frame(
 	}
 
 	/* If need to, and can, transform the touch ring reports */
-	if (frame->touch_byte > 0 && frame->touch_byte < size &&
-	    frame->touch_flip_at != 0) {
+	if (frame->touch_byte > 0 && frame->touch_byte < size) {
 		__s8 value = data[frame->touch_byte];
-		if (value != 0) {
-			value = frame->touch_flip_at - value;
-			if (value < 0)
-				value = frame->touch_max + value;
 
-			data[frame->touch_byte] = value;
+		if (value != 0) {
+			if (frame->touch_flip_at != 0) {
+				value = frame->touch_flip_at - value;
+				if (value <= 0)
+					value = frame->touch_max + value;
+			}
+			data[frame->touch_byte] = value - 1;
 		}
 	}
 
diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
index 459f15288ccc1..163efd026881c 100644
--- a/drivers/hid/hid-uclogic-params.c
+++ b/drivers/hid/hid-uclogic-params.c
@@ -889,7 +889,7 @@ static int uclogic_params_huion_init(struct uclogic_params *params,
 				UCLOGIC_RDESC_V2_FRAME_TOUCH_DEV_ID_BYTE;
 			p.frame_list[1].touch_byte = 5;
 			p.frame_list[1].touch_max = 12;
-			p.frame_list[1].touch_flip_at = 6;
+			p.frame_list[1].touch_flip_at = 7;
 
 			/* Create v2 frame dial parameters */
 			rc = uclogic_params_frame_init_with_desc(