1 files changed, 57 insertions, 0 deletions

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
new file mode 100644
index 000000000000..bb9e54322322
--- /dev/null
+++ b/include/linux/backlight.h
@@ -0,0 +1,57 @@
+/*
+ * Backlight Lowlevel Control Abstraction
+ *
+ * Copyright (C) 2003,2004 Hewlett-Packard Company
+ *
+ */
+
+#ifndef _LINUX_BACKLIGHT_H
+#define _LINUX_BACKLIGHT_H
+
+#include <linux/device.h>
+#include <linux/notifier.h>
+
+struct backlight_device;
+struct fb_info;
+
+/* This structure defines all the properties of a backlight
+   (usually attached to a LCD). */
+struct backlight_properties {
+        /* Owner module */
+        struct module *owner;
+        /* Get the backlight power status (0: full on, 1..3: power saving
+           modes; 4: full off), see FB_BLANK_XXX */
+        int (*get_power)(struct backlight_device *);
+        /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */
+        int (*set_power)(struct backlight_device *, int power);
+        /* Maximal value for brightness (read-only) */
+        int max_brightness;
+        /* Get current backlight brightness */
+        int (*get_brightness)(struct backlight_device *);
+        /* Set backlight brightness (0..max_brightness) */
+        int (*set_brightness)(struct backlight_device *, int brightness);
+        /* Check if given framebuffer device is the one bound to this backlight;
+           return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
+        int (*check_fb)(struct fb_info *);
+};
+
+struct backlight_device {
+        /* This protects the 'props' field. If 'props' is NULL, the driver that
+           registered this device has been unloaded, and if class_get_devdata()
+           points to something in the body of that driver, it is also invalid. */
+        struct semaphore sem;
+        /* If this is NULL, the backing module is unloaded */
+        struct backlight_properties *props;
+        /* The framebuffer notifier block */
+        struct notifier_block fb_notif;
+        /* The class device structure */
+        struct class_device class_dev;
+};
+
+extern struct backlight_device *backlight_device_register(const char *name,
+        void *devdata, struct backlight_properties *bp);
+extern void backlight_device_unregister(struct backlight_device *bd);
+
+#define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)
+
+#endif