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From:   Eirin Nya <nyanpasu256@gmail.com>
To:     linux-input@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] Input: Remove redundant field elantech_data::y_max
Date:   Thu, 29 Sep 2022 01:21:17 -0700
Message-Id: <20220929082119.22112-2-nyanpasu256@gmail.com>
In-Reply-To: <20220929082119.22112-1-nyanpasu256@gmail.com>
References: <20220929082119.22112-1-nyanpasu256@gmail.com>
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elantech_data::y_max is copied from elantech_device_info::y_max, and
neither is mutated after initialization. So remove the redundant
variable to prevent future bugs when updating y_max.

Signed-off-by: Eirin Nya <nyanpasu256@gmail.com>
---
 drivers/input/mouse/elantech.c | 17 ++++++++---------
 drivers/input/mouse/elantech.h |  1 -
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index ece97f8c6a..79e31611fc 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -360,7 +360,7 @@ static void elantech_report_absolute_v1(struct psmouse *psmouse)
 		input_report_abs(dev, ABS_X,
 			((packet[1] & 0x0c) << 6) | packet[2]);
 		input_report_abs(dev, ABS_Y,
-			etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
+			etd->info.y_max - (((packet[1] & 0x03) << 8) | packet[3]));
 	}
 
 	input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
@@ -435,7 +435,7 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
 		 * byte 4:  .   .   .   .  y11 y10 y9  y8
 		 * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
 		 */
-		y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
+		y1 = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 
 		pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
 		width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
@@ -450,7 +450,7 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
 		 */
 		x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
 		/* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
-		y1 = etd->y_max -
+		y1 = etd->info.y_max -
 			((((packet[0] & 0x20) << 3) | packet[2]) << 2);
 		/*
 		 * byte 3:  .   .  by8 bx8  .   .   .   .
@@ -458,7 +458,7 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
 		 */
 		x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
 		/* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
-		y2 = etd->y_max -
+		y2 = etd->info.y_max -
 			((((packet[3] & 0x20) << 3) | packet[5]) << 2);
 
 		/* Unknown so just report sensible values */
@@ -579,7 +579,7 @@ static void elantech_report_absolute_v3(struct psmouse *psmouse,
 		 * byte 4:  .   .   .   .  y11 y10 y9  y8
 		 * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
 		 */
-		y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
+		y1 = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 		break;
 
 	case 2:
@@ -593,7 +593,7 @@ static void elantech_report_absolute_v3(struct psmouse *psmouse,
 			 * byte 4:   .    .    .    .  ay11 ay10 ay9  ay8
 			 * byte 5: ay7  ay6  ay5  ay4  ay3  ay2  ay1  ay0
 			 */
-			etd->mt[0].y = etd->y_max -
+			etd->mt[0].y = etd->info.y_max -
 				(((packet[4] & 0x0f) << 8) | packet[5]);
 			/*
 			 * wait for next packet
@@ -605,7 +605,7 @@ static void elantech_report_absolute_v3(struct psmouse *psmouse,
 		x1 = etd->mt[0].x;
 		y1 = etd->mt[0].y;
 		x2 = ((packet[1] & 0x0f) << 8) | packet[2];
-		y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
+		y2 = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 		break;
 	}
 
@@ -681,7 +681,7 @@ static void process_packet_head_v4(struct psmouse *psmouse)
 		return;
 
 	etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
-	etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
+	etd->mt[id].y = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 	pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
 	traces = (packet[0] & 0xf0) >> 4;
 
@@ -1253,7 +1253,6 @@ static int elantech_set_input_params(struct psmouse *psmouse)
 		input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res);
 	}
 
-	etd->y_max = y_max;
 	etd->width = width;
 
 	return 0;
diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
index 571e6ca11d..1ec004f72d 100644
--- a/drivers/input/mouse/elantech.h
+++ b/drivers/input/mouse/elantech.h
@@ -180,7 +180,6 @@ struct elantech_data {
 	unsigned char reg_25;
 	unsigned char reg_26;
 	unsigned int single_finger_reports;
-	unsigned int y_max;
 	unsigned int width;
 	struct finger_pos mt[ETP_MAX_FINGERS];
 	unsigned char parity[256];
-- 
2.37.3