linux-kernel - [PATCH 1/2] leds: trigger: gpio: Refresh LED state after GPIO change

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Message-Id: <ce0b55daaadc57b452b3b002560b4cee93c52e59.1495804666.git.jan.kiszka@siemens.com>
Date:   Fri, 26 May 2017 15:17:46 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-leds@...r.kernel.org
Subject: [PATCH 1/2] leds: trigger: gpio: Refresh LED state after GPIO change

The new GPIO may have a different state than the old one.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 drivers/leds/trigger/ledtrig-gpio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
index 51288a45fbcb..93d6b82e6437 100644
--- a/drivers/leds/trigger/ledtrig-gpio.c
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -170,6 +170,8 @@ static ssize_t gpio_trig_gpio_store(struct device *dev,
 		if (gpio_data->gpio != 0)
 			free_irq(gpio_to_irq(gpio_data->gpio), led);
 		gpio_data->gpio = gpio;
+		/* After changing the GPIO, we need to update the LED. */
+		schedule_work(&gpio_data->work);
 	}
 
 	return ret ? ret : n;
-- 
2.12.0