linux-kernel - [PATCH v3 2/5] leds: Add helper for getting default pattern from Device Tree

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Date:   Wed, 12 Dec 2018 12:16:43 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Baolin Wang <baolin.wang@...aro.org>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/5] leds: Add helper for getting default pattern from Device Tree

Multiple LED triggers might need to access default pattern so add a
helper for that.

Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---

New patch in the series

---
 drivers/leds/led-class.c | 25 +++++++++++++++++++++++++
 include/linux/leds.h     |  3 +++
 2 files changed, 28 insertions(+)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 3c7e3487b373..44b95e6480f6 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -17,6 +17,7 @@
 #include <linux/leds.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/timer.h>
@@ -244,6 +245,30 @@ static int led_classdev_next_name(const char *init_name, char *name,
 }
 
 /**
+ * led_classdev_get_default_pattern - return default pattern
+ *
+ * @led_cdev: the led_classdev structure for this device
+ *
+ * Return: Null terminated string with default pattern from DeviceTree or NULL
+ */
+const char *led_classdev_get_default_pattern(struct led_classdev *led_cdev)
+{
+	struct device_node *np = dev_of_node(led_cdev->dev);
+	const char *pattern;
+
+	if (!np)
+		return NULL;
+
+	if (of_property_read_string(np, "led-pattern", &pattern))
+		return NULL;
+
+	if (!strlen(pattern))
+		return NULL;
+
+	return pattern;
+}
+
+/**
  * of_led_classdev_register - register a new object of led_classdev class.
  *
  * @parent: parent of LED device
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 5263f87e1d2c..9da2bfa183ea 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -129,6 +129,9 @@ struct led_classdev {
 	struct mutex		led_access;
 };
 
+extern const char *
+led_classdev_get_default_pattern(struct led_classdev *led_cdev);
+
 extern int of_led_classdev_register(struct device *parent,
 				    struct device_node *np,
 				    struct led_classdev *led_cdev);
-- 
2.7.4