backlight: use pr_warn() and pr_debug() instead of printk()

Use pr_warn() and pr_debug() instead of printk to allow dynamic debugging.
The pr_fmt prefix for pr_ macros is used.  Also fix checkpatch warnings
as below:

WARNING: Prefer pr_warn(... to printk(KERN_WARNING, ...

[akpm@linux-foundation.org: use KBUILD_MODNAME, per Joe]
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index bf5b1ece7160..297db2fa91f5 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -5,6 +5,8 @@
  *
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
@@ -123,7 +125,7 @@ static ssize_t backlight_store_power(struct device *dev,
         rc = -ENXIO;
         mutex_lock(&bd->ops_lock);
         if (bd->ops) {
-                pr_debug("backlight: set power to %lu\n", power);
+                pr_debug("set power to %lu\n", power);
                 if (bd->props.power != power) {
                         bd->props.power = power;
                         backlight_update_status(bd);
@@ -161,8 +163,7 @@ static ssize_t backlight_store_brightness(struct device *dev,
                 if (brightness > bd->props.max_brightness)
                         rc = -EINVAL;
                 else {
-                        pr_debug("backlight: set brightness to %lu\n",
-                                 brightness);
+                        pr_debug("set brightness to %lu\n", brightness);
                         bd->props.brightness = brightness;
                         backlight_update_status(bd);
                         rc = count;
@@ -378,8 +379,8 @@ static int __init backlight_class_init(void)
 {
         backlight_class = class_create(THIS_MODULE, "backlight");
         if (IS_ERR(backlight_class)) {
-                printk(KERN_WARNING "Unable to create backlight class; errno = %ld\n",
-                                PTR_ERR(backlight_class));
+                pr_warn("Unable to create backlight class; errno = %ld\n",
+                        PTR_ERR(backlight_class));
                 return PTR_ERR(backlight_class);
         }