linux-kernel - [PATCH v8 1/2] leds: move default

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Date:   Tue,  8 Jun 2021 08:35:53 +0200
From:   Denis Osterland-Heim <denis.osterland.heim@...il.com>
To:     Pavel Machek <pavel@....cz>
Cc:     denis.osterland@...hl.com, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Denis Osterland-Heim <Denis.Osterland@...hl.com>
Subject: [PATCH v8 1/2] leds: move default_state read from fwnode to core

From: Denis Osterland-Heim <Denis.Osterland@...hl.com>

This patch introduces a new function to read initial
default_state from fwnode.

Suggested-by: Pavel Machek <pavel@....cz>
Signed-off-by: Denis Osterland-Heim <Denis.Osterland@...hl.com>
---
 drivers/leds/led-core.c  | 15 +++++++++++++++
 drivers/leds/leds-gpio.c | 12 ++----------
 drivers/leds/leds.h      |  1 +
 include/linux/leds.h     | 12 +++++++++---
 4 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 8eb8054ef9c6..4a97cb745788 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -477,3 +477,18 @@ int led_compose_name(struct device *dev, struct led_init_data *init_data,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(led_compose_name);
+
+enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode)
+{
+	const char *state = NULL;
+
+	if (!fwnode_property_read_string(fwnode, "default-state", &state)) {
+		if (!strcmp(state, "keep"))
+			return LEDS_DEFSTATE_KEEP;
+		if (!strcmp(state, "on"))
+			return LEDS_DEFSTATE_ON;
+	}
+
+	return LEDS_DEFSTATE_OFF;
+}
+EXPORT_SYMBOL_GPL(led_init_default_state_get);
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index b5d5e22d2d1e..092eb59a7d32 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -16,6 +16,7 @@
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+#include "leds.h"
 
 struct gpio_led_data {
 	struct led_classdev cdev;
@@ -144,7 +145,6 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
 	device_for_each_child_node(dev, child) {
 		struct gpio_led_data *led_dat = &priv->leds[priv->num_leds];
 		struct gpio_led led = {};
-		const char *state = NULL;
 
 		/*
 		 * Acquire gpiod from DT with uninitialized label, which
@@ -161,15 +161,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
 
 		led_dat->gpiod = led.gpiod;
 
-		if (!fwnode_property_read_string(child, "default-state",
-						 &state)) {
-			if (!strcmp(state, "keep"))
-				led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
-			else if (!strcmp(state, "on"))
-				led.default_state = LEDS_GPIO_DEFSTATE_ON;
-			else
-				led.default_state = LEDS_GPIO_DEFSTATE_OFF;
-		}
+		led.default_state = led_init_default_state_get(child);
 
 		if (fwnode_property_present(child, "retain-state-suspended"))
 			led.retain_state_suspended = 1;
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index 345062ccabda..aa64757a4d89 100644
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -27,6 +27,7 @@ ssize_t led_trigger_read(struct file *filp, struct kobject *kobj,
 ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
 			struct bin_attribute *bin_attr, char *buf,
 			loff_t pos, size_t count);
+enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode);
 
 extern struct rw_semaphore leds_list_lock;
 extern struct list_head leds_list;
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 329fd914cf24..a0b730be40ad 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -33,6 +33,12 @@ enum led_brightness {
 	LED_FULL	= 255,
 };
 
+enum led_default_state {
+	LEDS_DEFSTATE_OFF	= 0,
+	LEDS_DEFSTATE_ON	= 1,
+	LEDS_DEFSTATE_KEEP	= 2,
+};
+
 struct led_init_data {
 	/* device fwnode handle */
 	struct fwnode_handle *fwnode;
@@ -520,9 +526,9 @@ struct gpio_led {
 	/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
 	struct gpio_desc *gpiod;
 };
-#define LEDS_GPIO_DEFSTATE_OFF		0
-#define LEDS_GPIO_DEFSTATE_ON		1
-#define LEDS_GPIO_DEFSTATE_KEEP		2
+#define LEDS_GPIO_DEFSTATE_OFF		LEDS_DEFSTATE_OFF
+#define LEDS_GPIO_DEFSTATE_ON		LEDS_DEFSTATE_ON
+#define LEDS_GPIO_DEFSTATE_KEEP		LEDS_DEFSTATE_KEEP
 
 struct gpio_led_platform_data {
 	int 		num_leds;
-- 
2.25.1