linux-kernel - [PATCH v3] HID: i2c-hid: use print_hex_dump

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Message-ID: <TYCP286MB26078CEC570EA9055D86D82DB1E4A@TYCP286MB2607.JPNP286.PROD.OUTLOOK.COM>
Date:   Fri,  1 Sep 2023 16:33:56 +0800
From:   Riwen Lu <luriwen@...mail.com>
To:     jikos@...nel.org, benjamin.tissoires@...hat.com,
        dmitry.torokhov@...il.com, linux@...ssschuh.net,
        hdegoede@...hat.com, rrangel@...omium.org,
        u.kleine-koenig@...gutronix.de
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        sergeantsagara@...tonmail.com, Riwen Lu <luriwen@...inos.cn>
Subject: [PATCH v3] HID: i2c-hid: use print_hex_dump_debug to print report descriptor

From: Riwen Lu <luriwen@...inos.cn>

The format '%*ph' prints up to 64 bytes long as a hex string with ' '
separator. Usually the size of report descriptor is larger than 64
bytes, so consider using print_hex_dump_debug to print out all of it for
better debugging.

Signed-off-by: Riwen Lu <luriwen@...inos.cn>

---
v1->v2:
 - Add a prefix for the hex dump.

v2->v3:
 - Print the size of report descriptor.
---
 drivers/hid/i2c-hid/i2c-hid-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index efbba0465eef..dd69abdd1f0d 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -772,7 +772,9 @@ static int i2c_hid_parse(struct hid_device *hid)
 		}
 	}
 
-	i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
+	i2c_hid_dbg(ihid, "Report Descriptor size: %#x\n", rsize);
+	print_hex_dump_debug("Report Descriptor: ", DUMP_PREFIX_OFFSET, 16, 1,
+			rdesc, rsize, false);
 
 	ret = hid_parse_report(hid, rdesc, rsize);
 	if (!use_override)
-- 
2.25.1