linux-kernel - [PATCH 2/6] HID: uclogic: Add battery quirk

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Message-Id: <20221226125454.16106-3-jose.exposito89@gmail.com>
Date:   Mon, 26 Dec 2022 13:54:50 +0100
From:   José Expósito <jose.exposito89@...il.com>
To:     jikos@...nel.org
Cc:     benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        José Expósito <jose.exposito89@...il.com>,
        Mia Kanashi <chad@...pilled.dev>,
        Andreas Grosse <andig.mail@...nline.de>
Subject: [PATCH 2/6] HID: uclogic: Add battery quirk

Some UGEE v2 tablets have a wireless version with an internal battery
and their firmware is able to report their battery level.

However, there was not found a field on their descriptor indicating
whether the tablet has battery or not, making it mandatory to classify
such devices through the UCLOGIC_BATTERY_QUIRK quirk.

Tested-by: Mia Kanashi <chad@...pilled.dev>
Tested-by: Andreas Grosse <andig.mail@...nline.de>
Signed-off-by: José Expósito <jose.exposito89@...il.com>
---
 drivers/hid/hid-uclogic-params.c | 5 +++++
 drivers/hid/hid-uclogic-params.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
index 2d46d4d50604..37cf4a93eafa 100644
--- a/drivers/hid/hid-uclogic-params.c
+++ b/drivers/hid/hid-uclogic-params.c
@@ -1222,6 +1222,11 @@ static int uclogic_params_ugee_v2_init_frame_mouse(struct uclogic_params *p)
  */
 static bool uclogic_params_ugee_v2_has_battery(struct hid_device *hdev)
 {
+	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+
+	if (drvdata->quirks & UCLOGIC_BATTERY_QUIRK)
+		return true;
+
 	/* The XP-PEN Deco LW vendor, product and version are identical to the
 	 * Deco L. The only difference reported by their firmware is the product
 	 * name. Add a quirk to support battery reporting on the wireless
diff --git a/drivers/hid/hid-uclogic-params.h b/drivers/hid/hid-uclogic-params.h
index 10a05c7fd939..b0e7f3807939 100644
--- a/drivers/hid/hid-uclogic-params.h
+++ b/drivers/hid/hid-uclogic-params.h
@@ -20,6 +20,7 @@
 #include <linux/hid.h>
 
 #define UCLOGIC_MOUSE_FRAME_QUIRK	BIT(0)
+#define UCLOGIC_BATTERY_QUIRK		BIT(1)
 
 /* Types of pen in-range reporting */
 enum uclogic_params_pen_inrange {
-- 
2.38.1