linux-kernel - [PATCH 1/2] HID: apple: avoid setting up battery timer for devices without battery

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Message-ID:
 <PN3PR01MB9597321C9A619D3CB336FB23B87BA@PN3PR01MB9597.INDPRD01.PROD.OUTLOOK.COM>
Date: Wed, 25 Jun 2025 19:46:03 +0530
From: Aditya Garg <gargaditya08@...e.com>
To: Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <bentiss@...nel.org>
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	José Expósito <jose.exposito89@...il.com>
Subject: [PATCH 1/2] HID: apple: avoid setting up battery timer for devices without battery

Currently, the battery timer is set up for all devices using hid-apple,
irrespective of whether they actually have a battery or not.

APPLE_RDESC_BATTERY is a quirk that indicates the device has a battery
and needs the battery timer. This patch checks for this quirk before
setting up the timer, ensuring that only devices with a battery will
have the timer set up.

Fixes: 6e143293e17a ("HID: apple: Report Magic Keyboard battery over USB")
Cc: stable@...r.kernel.org
Signed-off-by: Aditya Garg <gargaditya08@...e.com>
---
 drivers/hid/hid-apple.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
index b8b99eb01..b9f45c089 100644
--- a/drivers/hid/hid-apple.c
+++ b/drivers/hid/hid-apple.c
@@ -959,10 +959,12 @@ static int apple_probe(struct hid_device *hdev,
 		return ret;
 	}
 
-	timer_setup(&asc->battery_timer, apple_battery_timer_tick, 0);
-	mod_timer(&asc->battery_timer,
-		  jiffies + msecs_to_jiffies(APPLE_BATTERY_TIMEOUT_MS));
-	apple_fetch_battery(hdev);
+	if (quirks & APPLE_RDESC_BATTERY) {
+		timer_setup(&asc->battery_timer, apple_battery_timer_tick, 0);
+		mod_timer(&asc->battery_timer,
+			  jiffies + msecs_to_jiffies(APPLE_BATTERY_TIMEOUT_MS));
+		apple_fetch_battery(hdev);
+	}
 
 	if (quirks & APPLE_BACKLIGHT_CTL)
 		apple_backlight_init(hdev);
@@ -985,7 +987,8 @@ static void apple_remove(struct hid_device *hdev)
 {
 	struct apple_sc *asc = hid_get_drvdata(hdev);
 
-	timer_delete_sync(&asc->battery_timer);
+	if (asc->quirks & APPLE_RDESC_BATTERY)
+		timer_delete_sync(&asc->battery_timer);
 
 	hid_hw_stop(hdev);
 }
-- 
2.43.0