linux-kernel - [PATCH] HID: i2c-hid: fix the report-id passed in via set_or_send

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Date:   Tue, 26 Jul 2022 11:05:04 +0300
From:   Tero Kristo <tero.kristo@...ux.intel.com>
To:     linux-input@...r.kernel.org, benjamin.tissoires@...hat.com,
        jikos@...nel.org
Cc:     linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com
Subject: [PATCH] HID: i2c-hid: fix the report-id passed in via set_or_send_report

The formatting of the data passed to the i2c HID data register was
changed with the re-work of the i2c-hid-core. Previously the report ID
passed in was encoded as 0xF if the report-id was greater than 0xF
(similar to what is done with the command portion.) Now with the rework,
a full report-id is passed in always, and this causes the messages to be
rejected by the i2c controller. Fix this by encoding the report-id
field in the same manner as previously was done.

Fixes: dbe0dd5fd2e0 ("HID: i2c-hid: explicitly code setting and sending
reports")
Signed-off-by: Tero Kristo <tero.kristo@...ux.intel.com>
---
 drivers/hid/i2c-hid/i2c-hid-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index c078f09a2318..156b12f840c4 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -296,6 +296,9 @@ static size_t i2c_hid_format_report(u8 *buf, int report_id,
 {
 	size_t length = sizeof(__le16); /* reserve space to store size */

+	if (report_id > 0xF)
+		report_id = 0xF;
+
 	if (report_id)
 		buf[length++] = report_id;

-- 
2.25.1