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From: Eddie James <eajames@linux.ibm.com>
To: joel@jms.id.au
Cc: openbmc@lists.ozlabs.org
Subject: [PATCH linux dev-5.10 2/7] leds: leds-core: Implement the retain-state-shutdown property
Date: Thu, 16 Sep 2021 16:21:35 -0500	[thread overview]
Message-ID: <20210916212140.33915-3-eajames@linux.ibm.com> (raw)
In-Reply-To: <20210916212140.33915-1-eajames@linux.ibm.com>

Read the retain-state-shutdown device tree property to set the
existing LED_RETAIN_AT_SHUTDOWN flag. Then check the flag when
unregistering, and if set, don't set the brightness to OFF. This
is useful for systems that want to keep the HW state of the LED
across reboots.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
---
 drivers/leds/led-class.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 4365c1cc4505..bc66f1035d06 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -351,10 +351,15 @@ int led_classdev_register_ext(struct device *parent,
 		if (ret < 0)
 			return ret;
 
-		if (init_data->fwnode)
+		if (init_data->fwnode) {
 			fwnode_property_read_string(init_data->fwnode,
 				"linux,default-trigger",
 				&led_cdev->default_trigger);
+
+			if (fwnode_property_present(init_data->fwnode,
+						    "retain-state-shutdown"))
+				led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
+		}
 	} else {
 		proposed_name = led_cdev->name;
 	}
@@ -445,7 +450,8 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
 	/* Stop blinking */
 	led_stop_software_blink(led_cdev);
 
-	led_set_brightness(led_cdev, LED_OFF);
+	if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN))
+		led_set_brightness(led_cdev, LED_OFF);
 
 	flush_work(&led_cdev->set_brightness_work);
 
-- 
2.27.0


  parent reply	other threads:[~2021-09-16 21:25 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-16 21:21 [PATCH linux dev-5.10 0/7] leds: Support retaining state for the PCA955x Eddie James
2021-09-16 21:21 ` [PATCH linux dev-5.10 1/7] dt-bindings: leds: Add retain-state-shutdown boolean Eddie James
2021-09-16 21:21 ` Eddie James [this message]
2021-09-16 21:21 ` [PATCH linux dev-5.10 3/7] leds: pca955x: Clean up code formatting Eddie James
2021-09-16 21:21 ` [PATCH linux dev-5.10 4/7] leds: pca955x: Add brightness_get function Eddie James
2021-09-16 21:21 ` [PATCH linux dev-5.10 5/7] leds: pca955x: Implement the default-state property Eddie James
2021-09-16 21:21 ` [PATCH linux dev-5.10 6/7] leds: pca955x: Let the core process the fwnode Eddie James
2021-09-16 21:21 ` [PATCH linux dev-5.10 7/7] leds: pca955x: Switch to i2c probe_new Eddie James
2021-09-22  2:21 ` [PATCH linux dev-5.10 0/7] leds: Support retaining state for the PCA955x Joel Stanley

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