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[PATCH] Rewritten backlight infrastructure for portable Apple computers

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This patch contains a total rewrite of the backlight infrastructure for
portable Apple computers.  Backward compatibility is retained.  A sysfs
interface allows userland to control the brightness with more steps than
before.  Userland is allowed to upload a brightness curve for different
monitors, similar to Mac OS X.

[akpm@osdl.org: add needed exports]
Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Michael Hanselmann
2006-06-25 05:47:08 -07:00
committed by Linus Torvalds
parent 17660bdd5c
commit 5474c120aa
26 changed files with 1534 additions and 716 deletions
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23
include/linux/fb.h
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@@ -1,6 +1,7 @@
#ifndef _LINUX_FB_H
#define _LINUX_FB_H
#include <linux/backlight.h>
#include <asm/types.h>
/* Definitions of frame buffers */
@@ -366,6 +367,12 @@ struct fb_cursor {
struct fb_image image; /* Cursor image */
};
#ifdef CONFIG_FB_BACKLIGHT
/* Settings for the generic backlight code */
#define FB_BACKLIGHT_LEVELS 128
#define FB_BACKLIGHT_MAX 0xFF
#endif
#ifdef __KERNEL__
#include <linux/fs.h>
@@ -756,6 +763,21 @@ struct fb_info {
struct fb_cmap cmap; /* Current cmap */
struct list_head modelist; /* mode list */
struct fb_videomode *mode; /* current mode */
#ifdef CONFIG_FB_BACKLIGHT
/* Lock ordering:
* bl_mutex (protects bl_dev and bl_curve)
* bl_dev->sem (backlight class)
*/
struct mutex bl_mutex;
/* assigned backlight device */
struct backlight_device *bl_dev;
/* Backlight level curve */
u8 bl_curve[FB_BACKLIGHT_LEVELS];
#endif
struct fb_ops *fbops;
struct device *device;
struct class_device *class_device; /* sysfs per device attrs */
@@ -895,6 +917,7 @@ extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev);
extern void framebuffer_release(struct fb_info *info);
extern int fb_init_class_device(struct fb_info *fb_info);
extern void fb_cleanup_class_device(struct fb_info *head);
extern void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max);
/* drivers/video/fbmon.c */
#define FB_MAXTIMINGS 0