fb: Add dev_of_fbinfo() helper for optional sysfs support

Add dev_of_fbinfo() to return the framebuffer struct device when
CONFIG_FB_DEVICE is enabled, or NULL otherwise.

This allows fbdev drivers to use sysfs interfaces via runtime checks
instead of CONFIG_FB_DEVICE ifdefs, keeping the code clean while
remaining fully buildable.

Suggested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Helge Deller <deller@gmx.de>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Chintan Patel <chintanlike@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/include/linux/fb.h b/include/linux/fb.h
index aaa50b81f1d25d4ff79c99b7081cee256ef48485..e70ee58d689ed384aa09a972fb178bd1e3cd0cb2 100644 (file)
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -623,6 +623,15 @@ static inline void unlock_fb_info(struct fb_info *info)
        mutex_unlock(&info->lock);
 }
 
+static inline struct device *dev_of_fbinfo(const struct fb_info *info)
+{
+#ifdef CONFIG_FB_DEVICE
+       return info->dev;
+#else
+       return NULL;
+#endif
+}
+
 static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
                                           u8 *src, u32 s_pitch, u32 height)
 {