backlight: use kstrtoul()

The usage of simple_strtoul() or strict_strtoul() is not preferred.  Thus,
kstrtoul should be used.

This patch also fixes checkpatch error as follows:
ERROR: space required after that ',' (ctx:VxV)

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 16 deletions

diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index 71a11cadffc4..79c1b0d609a8 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -97,19 +97,16 @@ static ssize_t lcd_store_power(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t count)
 {
         int rc = -ENXIO;
-        char *endp;
         struct lcd_device *ld = to_lcd_device(dev);
-        int power = simple_strtoul(buf, &endp, 0);
-        size_t size = endp - buf;
+        unsigned long power;
 
-        if (isspace(*endp))
-                size++;
-        if (size != count)
-                return -EINVAL;
+        rc = kstrtoul(buf, 0, &power);
+        if (rc)
+                return rc;
 
         mutex_lock(&ld->ops_lock);
         if (ld->ops && ld->ops->set_power) {
-                pr_debug("lcd: set power to %d\n", power);
+                pr_debug("lcd: set power to %lu\n", power);
                 ld->ops->set_power(ld, power);
                 rc = count;
         }
@@ -136,19 +133,16 @@ static ssize_t lcd_store_contrast(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t count)
 {
         int rc = -ENXIO;
-        char *endp;
         struct lcd_device *ld = to_lcd_device(dev);
-        int contrast = simple_strtoul(buf, &endp, 0);
-        size_t size = endp - buf;
+        unsigned long contrast;
 
-        if (isspace(*endp))
-                size++;
-        if (size != count)
-                return -EINVAL;
+        rc = kstrtoul(buf, 0, &contrast);
+        if (rc)
+                return rc;
 
         mutex_lock(&ld->ops_lock);
         if (ld->ops && ld->ops->set_contrast) {
-                pr_debug("lcd: set contrast to %d\n", contrast);
+                pr_debug("lcd: set contrast to %lu\n", contrast);
                 ld->ops->set_contrast(ld, contrast);
                 rc = count;
         }