linux-kernel - [PATCH] leds: gpio: Add pinctrl PM select sleep,default state in suspend/resume

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Message-Id: <20170120164553.27565-1-enric.balletbo@collabora.com>
Date:   Fri, 20 Jan 2017 17:45:53 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] leds: gpio: Add pinctrl PM select sleep,default state in suspend/resume

This patch allows users to use an alternate pinctrl "sleep" in order to
clamp outputs to a wanted state at suspend.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---
 drivers/leds/leds-gpio.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index d400dca..a2e9bdb 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -20,6 +20,7 @@
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+#include <linux/pm.h>
 
 struct gpio_led_data {
 	struct led_classdev cdev;
@@ -269,12 +270,31 @@ static void gpio_led_shutdown(struct platform_device *pdev)
 	}
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int gpio_led_suspend(struct device *dev)
+{
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+
+static int gpio_led_resume(struct device *dev)
+{
+	pinctrl_pm_select_default_state(dev);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(gpio_led_pm, gpio_led_suspend, gpio_led_resume);
+
 static struct platform_driver gpio_led_driver = {
 	.probe		= gpio_led_probe,
 	.shutdown	= gpio_led_shutdown,
 	.driver		= {
 		.name	= "leds-gpio",
 		.of_match_table = of_gpio_leds_match,
+		.pm	= &gpio_led_pm,
 	},
 };
 
-- 
2.9.3