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From:   Andrey Smirnov <andrew.smirnov@gmail.com>
To:     linux-input@vger.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@gmail.com>,
        Sam Bazely <sambazley@fastmail.com>,
        Jiri Kosina <jikos@kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>,
        Henrik Rydberg <rydberg@bitmath.org>,
        "Pierre-Loup A . Griffais" <pgriffais@valvesoftware.com>,
        Austin Palmer <austinp@valvesoftware.com>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH 3/3] HID: logitech-hidpp: add G920 device validation quirk
Date:   Sun,  6 Oct 2019 22:12:40 -0700
Message-Id: <20191007051240.4410-4-andrew.smirnov@gmail.com>
In-Reply-To: <20191007051240.4410-1-andrew.smirnov@gmail.com>
References: <20191007051240.4410-1-andrew.smirnov@gmail.com>
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G920 device only advertises REPORT_ID_HIDPP_LONG and
REPORT_ID_HIDPP_VERY_LONG in its HID report descriptor, so querying
for REPORT_ID_HIDPP_SHORT with optional=false will always fail and
prevent G920 to be recognized as a valid HID++ device.

Modify hidpp_validate_device() to check only REPORT_ID_HIDPP_LONG with
optional=false on G920 to fix this.

Fixes: fe3ee1ec007b ("HID: logitech-hidpp: allow non HID++ devices to be handled by this module")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204191
Reported-by: Sam Bazely <sambazley@fastmail.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Henrik Rydberg <rydberg@bitmath.org>
Cc: Sam Bazely <sambazley@fastmail.com>
Cc: Pierre-Loup A. Griffais <pgriffais@valvesoftware.com>
Cc: Austin Palmer <austinp@valvesoftware.com>
Cc: linux-input@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
---
 drivers/hid/hid-logitech-hidpp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index cadf36d6c6f3..f415bf398e17 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -3511,6 +3511,12 @@ static bool hidpp_validate_report(struct hid_device *hdev, int id,
 
 static bool hidpp_validate_device(struct hid_device *hdev)
 {
+	struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+
+	if (hidpp->quirks & HIDPP_QUIRK_CLASS_G920)
+		return hidpp_validate_report(hdev, REPORT_ID_HIDPP_LONG,
+					     HIDPP_REPORT_SHORT_LENGTH, false);
+
 	return hidpp_validate_report(hdev, REPORT_ID_HIDPP_SHORT,
 				     HIDPP_REPORT_SHORT_LENGTH, false) &&
 	       hidpp_validate_report(hdev, REPORT_ID_HIDPP_LONG,
-- 
2.21.0