Merge tag 'backlight-next-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight

Pull backlight updates from Lee Jones:
 "Core Framework:
   - Report correct error status to user

  Fix-ups:
   - Move Backlight headers out of I2C (adp8860, adp8870)"

* tag 'backlight-next-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
  video: adp8870: move header file out of I2C realm
  backlight: adp8860: Move header file out of I2C realm
  backlight: Report error on failure

arch/blackfin/mach-bf537/boards/stamp.c

@@ -1995,7 +1995,7 @@ static struct adp5588_gpio_platform_data adp5588_gpio_data = {
 #endif
 
 #if IS_ENABLED(CONFIG_BACKLIGHT_ADP8870)
-#include <linux/i2c/adp8870.h>
+#include <linux/platform_data/adp8870.h>
 static struct led_info adp8870_leds[] = {
 	{
 		.name = "adp8870-led7",
@@ -2047,7 +2047,7 @@ static struct adp8870_backlight_platform_data adp8870_pdata = {
 #endif
 
 #if IS_ENABLED(CONFIG_BACKLIGHT_ADP8860)
-#include <linux/i2c/adp8860.h>
+#include <linux/platform_data/adp8860.h>
 static struct led_info adp8860_leds[] = {
 	{
 		.name = "adp8860-led7",

drivers/video/backlight/adp8860_bl.c

@@ -18,7 +18,7 @@
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 
-#include <linux/i2c/adp8860.h>
+#include <linux/platform_data/adp8860.h>
 #define ADP8860_EXT_FEATURES
 #define ADP8860_USE_LEDS
 

drivers/video/backlight/adp8870_bl.c

@@ -18,7 +18,7 @@
 #include <linux/workqueue.h>
 #include <linux/slab.h>
 
-#include <linux/i2c/adp8870.h>
+#include <linux/platform_data/adp8870.h>
 #define ADP8870_EXT_FEATURES
 #define ADP8870_USE_LEDS
 

drivers/video/backlight/backlight.c

@@ -134,7 +134,7 @@ static ssize_t bl_power_store(struct device *dev, struct device_attribute *attr,
 {
 	int rc;
 	struct backlight_device *bd = to_backlight_device(dev);
-	unsigned long power;
+	unsigned long power, old_power;
 
 	rc = kstrtoul(buf, 0, &power);
 	if (rc)
@@ -145,11 +145,17 @@ static ssize_t bl_power_store(struct device *dev, struct device_attribute *attr,
 	if (bd->ops) {
 		pr_debug("set power to %lu\n", power);
 		if (bd->props.power != power) {
+			old_power = bd->props.power;
 			bd->props.power = power;
-			backlight_update_status(bd);
-		}
+			rc = backlight_update_status(bd);
+			if (rc)
+				bd->props.power = old_power;
+			else
+				rc = count;
+		} else {
 			rc = count;
 		}
+	}
 	mutex_unlock(&bd->ops_lock);
 
 	return rc;
@@ -176,8 +182,7 @@ int backlight_device_set_brightness(struct backlight_device *bd,
 		else {
 			pr_debug("set brightness to %lu\n", brightness);
 			bd->props.brightness = brightness;
-			backlight_update_status(bd);
-			rc = 0;
+			rc = backlight_update_status(bd);
 		}
 	}
 	mutex_unlock(&bd->ops_lock);