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From:   George Stark <gnstark@salutedevices.com>
To:     <andy.shevchenko@gmail.com>, <pavel@ucw.cz>, <lee@kernel.org>,
        <vadimp@nvidia.com>, <mpe@ellerman.id.au>, <npiggin@gmail.com>,
        <christophe.leroy@csgroup.eu>, <hdegoede@redhat.com>,
        <mazziesaccount@gmail.com>, <peterz@infradead.org>,
        <mingo@redhat.com>, <will@kernel.org>, <longman@redhat.com>,
        <boqun.feng@gmail.com>, <nikitos.tr@gmail.com>
CC:     <linux-leds@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linuxppc-dev@lists.ozlabs.org>, <kernel@salutedevices.com>,
        George Stark <gnstark@salutedevices.com>
Subject: [PATCH v4 10/10] leds: powernv: use LED_RETAIN_AT_SHUTDOWN flag for leds
Date:   Thu, 14 Dec 2023 20:36:14 +0300
Message-ID: <20231214173614.2820929-11-gnstark@salutedevices.com>
In-Reply-To: <20231214173614.2820929-1-gnstark@salutedevices.com>
References: <20231214173614.2820929-1-gnstark@salutedevices.com>
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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@salutedevices.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 743e2cdd0891..018ec933ac10 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 int 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