From fd8d135b2c5e88662f2729e034913f183455a667 Mon Sep 17 00:00:00 2001
From: Alistair Francis <alistair@alistair23.me>
Date: Wed, 8 Dec 2021 22:40:43 +1000
Subject: [PATCH] HID: quirks: Allow inverting the absolute X/Y values
Git-commit: fd8d135b2c5e88662f2729e034913f183455a667
Patch-mainline: v5.17-rc1
References: git-fixes
Add a HID_QUIRK_X_INVERT/HID_QUIRK_Y_INVERT quirk that can be used
to invert the X/Y values.
Signed-off-by: Alistair Francis <alistair@alistair23.me>
[bentiss: silence checkpatch warning]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211208124045.61815-2-alistair@alistair23.me
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/hid/hid-input.c | 6 ++++++
include/linux/hid.h | 2 ++
2 files changed, 8 insertions(+)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 4186143da7c6..5f357dddcc01 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1329,6 +1329,12 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
input = field->hidinput->input;
+ if (usage->type == EV_ABS &&
+ (((*quirks & HID_QUIRK_X_INVERT) && usage->code == ABS_X) ||
+ ((*quirks & HID_QUIRK_Y_INVERT) && usage->code == ABS_Y))) {
+ value = field->logical_maximum - value;
+ }
+
if (usage->hat_min < usage->hat_max || usage->hat_dir) {
int hat_dir = usage->hat_dir;
if (!hat_dir)
diff --git a/include/linux/hid.h b/include/linux/hid.h
index ff8b6973022a..a14c089eb0c1 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -359,6 +359,8 @@ struct hid_item {
/* BIT(9) reserved for backward compatibility, was NO_INIT_INPUT_REPORTS */
#define HID_QUIRK_ALWAYS_POLL BIT(10)
#define HID_QUIRK_INPUT_PER_APP BIT(11)
+#define HID_QUIRK_X_INVERT BIT(12)
+#define HID_QUIRK_Y_INVERT BIT(13)
#define HID_QUIRK_SKIP_OUTPUT_REPORTS BIT(16)
#define HID_QUIRK_SKIP_OUTPUT_REPORT_ID BIT(17)
#define HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP BIT(18)
--
2.31.1