linux-kernel - [PATCH linux-next v2] backlight: use sysfs

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Message-Id: <20220928014115.261470-1-ye.xingchen@zte.com.cn>
Date:   Wed, 28 Sep 2022 01:41:15 +0000
From:   yexingchen116@...il.com
To:     jingoohan1@...il.com
Cc:     lee@...nel.org, daniel.thompson@...aro.org, deller@....de,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ye xingchen <ye.xingchen@....com.cn>
Subject: [PATCH linux-next v2] backlight: use sysfs_emit() to instead of scnprintf()

From: ye xingchen <ye.xingchen@....com.cn>

Replace the open-code with sysfs_emit() to simplify the code.

Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
---
v1 -> v2
Add the rest of this fixes for this pattern in the 'drivers/video/backlight' directory.
 drivers/video/backlight/lm3533_bl.c | 10 +++++-----
 drivers/video/backlight/lp855x_bl.c |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index 1df1b6643c0b..5e2ce9285245 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -66,7 +66,7 @@ static ssize_t show_id(struct device *dev,
 {
 	struct lm3533_bl *bl = dev_get_drvdata(dev);
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id);
+	return sysfs_emit(buf, "%d\n", bl->id);
 }
 
 static ssize_t show_als_channel(struct device *dev,
@@ -75,7 +75,7 @@ static ssize_t show_als_channel(struct device *dev,
 	struct lm3533_bl *bl = dev_get_drvdata(dev);
 	unsigned channel = lm3533_bl_get_ctrlbank_id(bl);
 
-	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
+	return sysfs_emit(buf, "%u\n", channel);
 }
 
 static ssize_t show_als_en(struct device *dev,
@@ -95,7 +95,7 @@ static ssize_t show_als_en(struct device *dev,
 	mask = 1 << (2 * ctrlbank);
 	enable = val & 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,
@@ -147,7 +147,7 @@ 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,
@@ -190,7 +190,7 @@ 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,
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index bd0bdeae23a4..fafc1a9e76ef 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -293,7 +293,7 @@ static ssize_t lp855x_get_chip_id(struct device *dev,
 {
 	struct lp855x *lp = dev_get_drvdata(dev);
 
-	return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
+	return sysfs_emit(buf, "%s\n", lp->chipname);
 }
 
 static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
@@ -307,7 +307,7 @@ static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
 	else if (lp->mode == REGISTER_BASED)
 		strmode = "register based";
 
-	return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
+	return sysfs_emit(buf, "%s\n", strmode);
 }
 
 static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
-- 
2.25.1