linux-kernel - [PATCH] HID: hid-debug: more informative output for EV

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Date: Sat, 13 Apr 2024 12:23:30 +0000
From: Thomas Kuehne <thomas.kuehne@....li>
To: jikos@...nel.org, bentiss@...nel.org
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] HID: hid-debug: more informative output for EV_KEY

Currently hid-debug's hid_resolv_event prints questions marks for
all entries without explicit mapping information. This makes
debugging unnecessarily complicated as multiple different
keys may simply result in the same uninformative output.

Some common event codes are deliberately not defined in
input-event-codes.h. For example the 16th gamepad key.

Instead, print the hexadecimal codes for all events without symbolic
names.

Signed-off-by: Thomas Kuehne <thomas.kuehne@....li>
---
 drivers/hid/hid-debug.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
index add353a17853..0a0c435a1284 100644
--- a/drivers/hid/hid-debug.c
+++ b/drivers/hid/hid-debug.c
@@ -3582,8 +3582,15 @@ static const char **names[EV_MAX + 1] = {

 static void hid_resolv_event(__u8 type, __u16 code, struct seq_file *f)
 {
-	seq_printf(f, "%s.%s", events[type] ? events[type] : "?",
-		names[type] ? (names[type][code] ? names[type][code] : "?") : "?");
+	if (events[type])
+		seq_printf(f, "%s.", events[type]);
+	else
+		seq_printf(f, "%02x.", type);
+
+	if (names[type] && names[type][code])
+		seq_printf(f, "%s", names[type][code]);
+	else
+		seq_printf(f, "%04x", code);
 }

 static void hid_dump_input_mapping(struct hid_device *hid, struct seq_file *f)

base-commit: 9ed46da14b9b9b2ad4edb3b0c545b6dbe5c00d39
--
2.40.1