linux-kernel - [PATCH v2 1/5] HID: playstation: DS4: Fix LED blinking

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Date: Thu,  8 Feb 2024 01:36:43 +0900
From: Max Staudt <max@...as.org>
To: Roderick Colenbrander <roderick.colenbrander@...y.com>,
	Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	max@...as.org
Subject: [PATCH v2 1/5] HID: playstation: DS4: Fix LED blinking

There was no way to disable blinking once enabled.
Disable it on brightness = 0, as per the Linux LED spec.

The driver reports back the values it sends to the controller, but they
need to be scaled back to milliseconds. Setting the LED blinking via
sysfs works as expected now.

Signed-off-by: Max Staudt <max@...as.org>
---
 drivers/hid/hid-playstation.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c
index 8ac8f7b8e317..7f50e13601f0 100644
--- a/drivers/hid/hid-playstation.c
+++ b/drivers/hid/hid-playstation.c
@@ -2037,8 +2037,9 @@ static int dualshock4_led_set_blink(struct led_classdev *led, unsigned long *del
 
 	dualshock4_schedule_work(ds4);
 
-	*delay_on = ds4->lightbar_blink_on;
-	*delay_off = ds4->lightbar_blink_off;
+	/* Report scaled values back to LED subsystem */
+	*delay_on = ds4->lightbar_blink_on * 10;
+	*delay_off = ds4->lightbar_blink_off * 10;
 
 	return 0;
 }
@@ -2065,6 +2066,13 @@ static int dualshock4_led_set_brightness(struct led_classdev *led, enum led_brig
 		break;
 	case 3:
 		ds4->lightbar_enabled = !!value;
+
+		/* brightness = 0 also cancels blinking in Linux. */
+		if (!ds4->lightbar_enabled) {
+			ds4->lightbar_blink_off = 0;
+			ds4->lightbar_blink_on = 0;
+			ds4->update_lightbar_blink = true;
+		}
 	}
 
 	ds4->update_lightbar = true;
-- 
2.39.2