From e9fe0d4921ee07d934d839d8e418f83dded48aa7 Mon Sep 17 00:00:00 2001
From: Jason Gerecke <killertofu@gmail.com>
Date: Thu, 24 Jan 2019 11:09:44 -0800
Subject: [PATCH] HID: wacom: Move HID fix for AES serial number into wacom_hid_usage_quirk
Git-commit: e9fe0d4921ee07d934d839d8e418f83dded48aa7
Patch-mainline: v5.1-rc1
References: bsc#1051510

The 'wacom_hid_usage_quirk' function is the intended home for fixing
up descriptors that are buggy or that don't quite fit the mold. Commit
578325120e was supposed to move all of these quirks but it missed the
code to handle fixup the serial number usages for AES pens. Lets move
this code out of 'wacom_wac_pen_usage_mapping' where it was previously
lurking and put it into the same place as the others.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/hid/wacom_sys.c | 32 ++++++++++++++++++++++++++++++++
 drivers/hid/wacom_wac.c | 21 ---------------------
 2 files changed, 32 insertions(+), 21 deletions(-)

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 0bdd85d486fe..a8633b1437b2 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -252,6 +252,38 @@ static void wacom_hid_usage_quirk(struct hid_device *hdev,
 		}
 	}
 
+	/*
+	 * Wacom's AES devices use different vendor-defined usages to
+	 * report serial number information compared to their branded
+	 * hardware. The usages are also sometimes ill-defined and do
+	 * not have the correct logical min/max values set. Lets patch
+	 * the descriptor to use the branded usage convention and fix
+	 * the errors.
+	 */
+	if (usage->hid == WACOM_HID_WT_SERIALNUMBER &&
+	    field->report_size == 16 &&
+	    field->index + 2 < field->report->maxfield) {
+		struct hid_field *a = field->report->field[field->index + 1];
+		struct hid_field *b = field->report->field[field->index + 2];
+
+		if (a->maxusage > 0 &&
+		    a->usage[0].hid == HID_DG_TOOLSERIALNUMBER &&
+		    a->report_size == 32 &&
+		    b->maxusage > 0 &&
+		    b->usage[0].hid == 0xFF000000 &&
+		    b->report_size == 8) {
+			features->quirks |= WACOM_QUIRK_AESPEN;
+			usage->hid = WACOM_HID_WD_TOOLTYPE;
+			field->logical_minimum = S16_MIN;
+			field->logical_maximum = S16_MAX;
+			a->logical_minimum = S32_MIN;
+			a->logical_maximum = S32_MAX;
+			b->usage[0].hid = WACOM_HID_WD_SERIALHI;
+			b->logical_minimum = 0;
+			b->logical_maximum = U8_MAX;
+		}
+	}
+
 	/* 2nd-generation Intuos Pro Large has incorrect Y maximum */
 	if (hdev->vendor == USB_VENDOR_ID_WACOM &&
 	    hdev->product == 0x0358 &&
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 5dd3a8245f0f..72477e872324 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -2159,27 +2159,6 @@ static void wacom_wac_pen_usage_mapping(struct hid_device *hdev,
 	case HID_DG_TOOLSERIALNUMBER:
 		features->quirks |= WACOM_QUIRK_TOOLSERIAL;
 		wacom_map_usage(input, usage, field, EV_MSC, MSC_SERIAL, 0);
-
-		/* Adjust AES usages to match modern convention */
-		if (usage->hid == WACOM_HID_WT_SERIALNUMBER && field->report_size == 16) {
-			if (field->index + 2 < field->report->maxfield) {
-				struct hid_field *a = field->report->field[field->index + 1];
-				struct hid_field *b = field->report->field[field->index + 2];
-
-				if (a->maxusage > 0 && a->usage[0].hid == HID_DG_TOOLSERIALNUMBER && a->report_size == 32 &&
-				    b->maxusage > 0 && b->usage[0].hid == 0xFF000000 && b->report_size == 8) {
-					features->quirks |= WACOM_QUIRK_AESPEN;
-					usage->hid = WACOM_HID_WD_TOOLTYPE;
-					field->logical_minimum = S16_MIN;
-					field->logical_maximum = S16_MAX;
-					a->logical_minimum = S32_MIN;
-					a->logical_maximum = S32_MAX;
-					b->usage[0].hid = WACOM_HID_WD_SERIALHI;
-					b->logical_minimum = 0;
-					b->logical_maximum = U8_MAX;
-				}
-			}
-		}
 		break;
 	case WACOM_HID_WD_SENSE:
 		features->quirks |= WACOM_QUIRK_SENSE;
-- 
2.16.4