From 6d92cdee2c8ff1e98ccb748a3f3ae9613b210a57 Mon Sep 17 00:00:00 2001
From: Jianhui Zhao <jianhui.zhao@gl-inet.com>
Date: Fri, 24 Sep 2021 20:06:49 +0800
Subject: [PATCH] kernel: leds: support gradient in led-trigger-timer

Signed-off-by: Jianhui Zhao <jianhui.zhao@gl-inet.com>
---
 .../955-leds-support-gradient.patch           | 111 ++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 target/linux/generic/pending-4.14/955-leds-support-gradient.patch

diff --git a/target/linux/generic/pending-4.14/955-leds-support-gradient.patch b/target/linux/generic/pending-4.14/955-leds-support-gradient.patch
new file mode 100644
index 0000000000..0712c942e7
--- /dev/null
+++ b/target/linux/generic/pending-4.14/955-leds-support-gradient.patch
@@ -0,0 +1,111 @@
+--- a/drivers/leds/led-core.c
++++ b/drivers/leds/led-core.c
+@@ -227,6 +227,15 @@ void led_stop_software_blink(struct led_
+ }
+ EXPORT_SYMBOL_GPL(led_stop_software_blink);
+ 
++void led_gradient_set(struct led_classdev *led_cdev, bool on)
++{
++	if (led_cdev->gradient_set) {
++		led_cdev->gradient_set(led_cdev, on);
++		return;
++	}
++}
++EXPORT_SYMBOL_GPL(led_gradient_set);
++
+ void led_set_brightness(struct led_classdev *led_cdev,
+ 			enum led_brightness brightness)
+ {
+--- a/drivers/leds/trigger/ledtrig-timer.c
++++ b/drivers/leds/trigger/ledtrig-timer.c
+@@ -68,8 +68,34 @@ static ssize_t led_delay_off_store(struc
+ 	return size;
+ }
+ 
++static ssize_t led_gradient_show(struct device *dev,
++		struct device_attribute *attr, char *buf)
++{
++	struct led_classdev *led_cdev = dev_get_drvdata(dev);
++
++	return sprintf(buf, "%d\n", led_cdev->gradiented);
++}
++
++static ssize_t led_gradient_store(struct device *dev,
++		struct device_attribute *attr, const char *buf, size_t size)
++{
++	struct led_classdev *led_cdev = dev_get_drvdata(dev);
++	unsigned long state;
++	ssize_t ret = -EINVAL;
++
++	ret = kstrtoul(buf, 10, &state);
++	if (ret)
++		return ret;
++
++	led_gradient_set(led_cdev, state);
++	led_cdev->gradiented = state ? true : false;
++
++	return size;
++}
++
+ static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
+ static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
++static DEVICE_ATTR(gradient, 0644, led_gradient_show, led_gradient_store);
+ 
+ static void timer_trig_activate(struct led_classdev *led_cdev)
+ {
+@@ -83,6 +109,9 @@ static void timer_trig_activate(struct l
+ 	rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
+ 	if (rc)
+ 		goto err_out_delayon;
++	rc = device_create_file(led_cdev->dev, &dev_attr_gradient);
++	if (rc)
++		goto err_out_delayoff;
+ 
+ 	led_blink_set(led_cdev, &led_cdev->blink_delay_on,
+ 		      &led_cdev->blink_delay_off);
+@@ -90,6 +119,8 @@ static void timer_trig_activate(struct l
+ 
+ 	return;
+ 
++err_out_delayoff:
++	device_remove_file(led_cdev->dev, &dev_attr_delay_off);
+ err_out_delayon:
+ 	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+ }
+@@ -99,6 +130,7 @@ static void timer_trig_deactivate(struct
+ 	if (led_cdev->activated) {
+ 		device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+ 		device_remove_file(led_cdev->dev, &dev_attr_delay_off);
++		device_remove_file(led_cdev->dev, &dev_attr_gradient);
+ 		led_cdev->activated = false;
+ 	}
+ 
+--- a/include/linux/leds.h
++++ b/include/linux/leds.h
+@@ -88,12 +88,16 @@ struct led_classdev {
+ 				     unsigned long *delay_on,
+ 				     unsigned long *delay_off);
+ 
++	/* Activate hardware accelerated gradient */
++	void (*gradient_set)(struct led_classdev *led_cdev, bool on);
++
+ 	struct device		*dev;
+ 	const struct attribute_group	**groups;
+ 
+ 	struct list_head	 node;			/* LED Device list */
+ 	const char		*default_trigger;	/* Trigger to use */
+ 
++	bool gradiented;
+ 	unsigned long		 blink_delay_on, blink_delay_off;
+ 	struct timer_list	 blink_timer;
+ 	int			 blink_brightness;
+@@ -157,6 +161,9 @@ extern void led_classdev_resume(struct l
+ extern void led_blink_set(struct led_classdev *led_cdev,
+ 			  unsigned long *delay_on,
+ 			  unsigned long *delay_off);
++
++extern void led_gradient_set(struct led_classdev *led_cdev, bool on);
++
+ /**
+  * led_blink_set_oneshot - do a oneshot software blink
+  * @led_cdev: the LED to start blinking
-- 
2.17.1