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From 0e1f3e627627e67cb823a37cf1c1834baa3d6f88 Mon Sep 17 00:00:00 2001
From: "Daniel J. Ogorchock" <djogorchock@gmail.com>
Date: Sun, 13 Oct 2019 18:06:08 -0500
Subject: [PATCH 09/14] HID: nintendo: patch hw version for userspace HID
mappings
This patch sets the most significant bit of the hid hw version to allow
userspace to distinguish between this driver's input mappings vs. the
default hid mappings. This prevents breaking userspace applications that
use SDL2 for gamepad input, allowing them to distinguish the mappings
based on the version.
Signed-off-by: Daniel J. Ogorchock <djogorchock@gmail.com>
---
drivers/hid/hid-nintendo.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/hid/hid-nintendo.c b/drivers/hid/hid-nintendo.c
index f2864fd9fc5d..c2f7dc83d875 100644
--- a/drivers/hid/hid-nintendo.c
+++ b/drivers/hid/hid-nintendo.c
@@ -1423,6 +1423,15 @@ static int nintendo_hid_probe(struct hid_device *hdev,
goto err_wq;
}
+ /*
+ * Patch the hw version of pro controller/joycons, so applications can
+ * distinguish between the default HID mappings and the mappings defined
+ * by the Linux game controller spec. This is important for the SDL2
+ * library, which has a game controller database, which uses device ids
+ * in combination with version as a key.
+ */
+ hdev->version |= 0x8000;
+
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
if (ret) {
hid_err(hdev, "HW start failed\n");
--
2.28.0
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