linux-kernel - [PATCH v6 9/9] leds: powernv: use LED_RETAIN_AT

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Message-ID: <20240314084531.1935545-10-gnstark@salutedevices.com>
Date: Thu, 14 Mar 2024 11:45:31 +0300
From: George Stark <gnstark@...utedevices.com>
To: <andy.shevchenko@...il.com>, <pavel@....cz>, <lee@...nel.org>,
	<vadimp@...dia.com>, <mpe@...erman.id.au>, <npiggin@...il.com>,
	<christophe.leroy@...roup.eu>, <hdegoede@...hat.com>,
	<mazziesaccount@...il.com>, <peterz@...radead.org>, <mingo@...hat.com>,
	<will@...nel.org>, <longman@...hat.com>, <boqun.feng@...il.com>,
	<nikitos.tr@...il.com>, <marek.behun@....cz>, <kabel@...nel.org>
CC: <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <kernel@...utedevices.com>, George Stark
	<gnstark@...utedevices.com>
Subject: [PATCH v6 9/9] leds: powernv: use LED_RETAIN_AT_SHUTDOWN flag for leds

This driver wants to keep its LEDs state after module is removed
and implemented it in its own way. LED subsystem supports dedicated
flag LED_RETAIN_AT_SHUTDOWN for the same purpose so use the flag
instead of custom implementation.

Signed-off-by: George Stark <gnstark@...utedevices.com>
---
 drivers/leds/leds-powernv.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/leds/leds-powernv.c b/drivers/leds/leds-powernv.c
index 4f01acb75727..9c6fb7d6e0e7 100644
--- a/drivers/leds/leds-powernv.c
+++ b/drivers/leds/leds-powernv.c
@@ -30,15 +30,6 @@ static const struct led_type_map led_type_map[] = {
 };
 
 struct powernv_led_common {
-	/*
-	 * By default unload path resets all the LEDs. But on PowerNV
-	 * platform we want to retain LED state across reboot as these
-	 * are controlled by firmware. Also service processor can modify
-	 * the LEDs independent of OS. Hence avoid resetting LEDs in
-	 * unload path.
-	 */
-	bool		led_disabled;
-
 	/* Max supported LED type */
 	__be64		max_led_type;
 
@@ -178,10 +169,6 @@ static int powernv_brightness_set(struct led_classdev *led_cdev,
 	struct powernv_led_common *powernv_led_common = powernv_led->common;
 	int rc;
 
-	/* Do not modify LED in unload path */
-	if (powernv_led_common->led_disabled)
-		return 0;
-
 	mutex_lock(&powernv_led_common->lock);
 	rc = powernv_led_set(powernv_led, value);
 	mutex_unlock(&powernv_led_common->lock);
@@ -225,6 +212,14 @@ static int powernv_led_create(struct device *dev,
 
 	powernv_led->cdev.brightness_set_blocking = powernv_brightness_set;
 	powernv_led->cdev.brightness_get = powernv_brightness_get;
+	/*
+	 * By default unload path resets all the LEDs. But on PowerNV
+	 * platform we want to retain LED state across reboot as these
+	 * are controlled by firmware. Also service processor can modify
+	 * the LEDs independent of OS. Hence avoid resetting LEDs in
+	 * unload path.
+	 */
+	powernv_led->cdev.flags = LED_RETAIN_AT_SHUTDOWN;
 	powernv_led->cdev.brightness = LED_OFF;
 	powernv_led->cdev.max_brightness = LED_FULL;
 
@@ -313,9 +308,7 @@ static void powernv_led_remove(struct platform_device *pdev)
 {
 	struct powernv_led_common *powernv_led_common;
 
-	/* Disable LED operation */
 	powernv_led_common = platform_get_drvdata(pdev);
-	powernv_led_common->led_disabled = true;
 
 	/* Destroy lock */
 	mutex_destroy(&powernv_led_common->lock);
-- 
2.25.1