fbdev: make FB_BACKLIGHT a tristate

BACKLIGHT_CLASS_DEVICE is already tristate, but a dependency
FB_BACKLIGHT prevents it from being built as a module.  There
doesn't seem to be any particularly good reason for this, so
switch FB_BACKLIGHT over to tristate.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Simon Horman <horms+renesas@verge.net.au>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Ulf Magnusson <ulfalizer@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Hans de Goede <j.w.r.degoede@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

2 files changed, 5 insertions, 5 deletions

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index e413f54208f4..5d85965767e3 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -184,7 +184,7 @@ config FB_MACMODES
        depends on FB
 
 config FB_BACKLIGHT
-        bool
+        tristate
         depends on FB
         select BACKLIGHT_LCD_SUPPORT
         select BACKLIGHT_CLASS_DEVICE
diff --git a/drivers/video/fbdev/core/fbsysfs.c b/drivers/video/fbdev/core/fbsysfs.c
index e31a182b42bf..44cca39f2b51 100644
--- a/drivers/video/fbdev/core/fbsysfs.c
+++ b/drivers/video/fbdev/core/fbsysfs.c
@@ -60,7 +60,7 @@ struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
         info->device = dev;
         info->fbcon_rotate_hint = -1;
 
-#ifdef CONFIG_FB_BACKLIGHT
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
         mutex_init(&info->bl_curve_mutex);
 #endif
 
@@ -429,7 +429,7 @@ static ssize_t show_fbstate(struct device *device,
         return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
 }
 
-#ifdef CONFIG_FB_BACKLIGHT
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
 static ssize_t store_bl_curve(struct device *device,
                               struct device_attribute *attr,
                               const char *buf, size_t count)
@@ -510,7 +510,7 @@ static struct device_attribute device_attrs[] = {
         __ATTR(stride, S_IRUGO, show_stride, NULL),
         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
         __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
-#ifdef CONFIG_FB_BACKLIGHT
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
         __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve),
 #endif
 };
@@ -551,7 +551,7 @@ void fb_cleanup_device(struct fb_info *fb_info)
         }
 }
 
-#ifdef CONFIG_FB_BACKLIGHT
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
 /* This function generates a linear backlight curve
  *
  *     0: off