leds: use sysfs_emit() to instead of scnprintf()

Replace the open-code with sysfs_emit() to simplify the code.
Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

drivers/leds/leds-blinkm.c

@@ -139,11 +139,11 @@ static ssize_t show_color_common(struct device *dev, char *buf, int color)
 		return ret;
 	switch (color) {
 	case RED:
-		return scnprintf(buf, PAGE_SIZE, "%02X\n", data->red);
+		return sysfs_emit(buf, "%02X\n", data->red);
 	case GREEN:
-		return scnprintf(buf, PAGE_SIZE, "%02X\n", data->green);
+		return sysfs_emit(buf, "%02X\n", data->green);
 	case BLUE:
-		return scnprintf(buf, PAGE_SIZE, "%02X\n", data->blue);
+		return sysfs_emit(buf, "%02X\n", data->blue);
 	default:
 		return -EINVAL;
 	}
@@ -253,7 +253,7 @@ static DEVICE_ATTR_RW(blue);
 static ssize_t test_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
-	return scnprintf(buf, PAGE_SIZE,
+	return sysfs_emit(buf,
 			 "#Write into test to start test sequence!#\n");
 }
 

drivers/leds/leds-lm3533.c

@@ -314,7 +314,7 @@ static ssize_t show_id(struct device *dev,
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
+	return sysfs_emit(buf, "%d\n", led->id);
 }
 
 /*
@@ -344,7 +344,7 @@ static ssize_t show_risefalltime(struct device *dev,
 	if (ret)
 		return ret;
 
-	return scnprintf(buf, PAGE_SIZE, "%x\n", val);
+	return sysfs_emit(buf, "%x\n", val);
 }
 
 static ssize_t show_risetime(struct device *dev,
@@ -415,7 +415,7 @@ static ssize_t show_als_channel(struct device *dev,
 
 	channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
 
-	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
+	return sysfs_emit(buf, "%u\n", channel);
 }
 
 static ssize_t store_als_channel(struct device *dev,
@@ -465,7 +465,7 @@ static ssize_t show_als_en(struct device *dev,
 
 	enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
+	return sysfs_emit(buf, "%d\n", enable);
 }
 
 static ssize_t store_als_en(struct device *dev,
@@ -518,7 +518,7 @@ static ssize_t show_linear(struct device *dev,
 	else
 		linear = 0;
 
-	return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
+	return sysfs_emit(buf, "%x\n", linear);
 }
 
 static ssize_t store_linear(struct device *dev,
@@ -564,7 +564,7 @@ static ssize_t show_pwm(struct device *dev,
 	if (ret)
 		return ret;
 
-	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+	return sysfs_emit(buf, "%u\n", val);
 }
 
 static ssize_t store_pwm(struct device *dev,

drivers/leds/leds-lp5521.c

@@ -469,7 +469,7 @@ static ssize_t lp5521_selftest(struct device *dev,
 	ret = lp5521_run_selftest(chip, buf);
 	mutex_unlock(&chip->lock);
 
-	return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
+	return sysfs_emit(buf, "%s\n", ret ? "FAIL" : "OK");
 }
 
 /* device attributes */

drivers/leds/leds-lp55xx-common.c

@@ -88,7 +88,7 @@ static ssize_t led_current_show(struct device *dev,
 {
 	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current);
+	return sysfs_emit(buf, "%d\n", led->led_current);
 }
 
 static ssize_t led_current_store(struct device *dev,
@@ -121,7 +121,7 @@ static ssize_t max_current_show(struct device *dev,
 {
 	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current);
+	return sysfs_emit(buf, "%d\n", led->max_current);
 }
 
 static DEVICE_ATTR_RW(led_current);

drivers/leds/trigger/ledtrig-pattern.c

@@ -155,7 +155,7 @@ static ssize_t repeat_show(struct device *dev, struct device_attribute *attr,
 
 	mutex_unlock(&data->lock);
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", repeat);
+	return sysfs_emit(buf, "%d\n", repeat);
 }
 
 static ssize_t repeat_store(struct device *dev, struct device_attribute *attr,