[PATCH] Rewritten backlight infrastructure for portable Apple computers

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>

1 files changed, 12 insertions, 7 deletions

diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig
index ccf5df44cde4..37cd6ee4586b 100644
--- a/drivers/macintosh/Kconfig
+++ b/drivers/macintosh/Kconfig
@@ -99,17 +99,22 @@ config PMAC_MEDIABAY
           devices are not fully supported in the bay as I never had one to
           try with
 
-# made a separate option since backlight may end up beeing used
-# on non-powerbook machines (but only on PMU based ones AFAIK)
 config PMAC_BACKLIGHT
         bool "Backlight control for LCD screens"
         depends on ADB_PMU && (BROKEN || !PPC64)
         help
-          Say Y here to build in code to manage the LCD backlight on a
-          Macintosh PowerBook.  With this code, the backlight will be turned
-          on and off appropriately on power-management and lid-open/lid-closed
-          events; also, the PowerBook button device will be enabled so you can
-          change the screen brightness.
+          Say Y here to enable Macintosh specific extensions of the generic
+          backlight code. With this enabled, the brightness keys on older
+          PowerBooks will be enabled so you can change the screen brightness.
+          Newer models should use an userspace daemon like pbbuttonsd.
+
+config PMAC_BACKLIGHT_LEGACY
+        bool "Provide legacy ioctl's on /dev/pmu for the backlight"
+        depends on PMAC_BACKLIGHT && (BROKEN || !PPC64)
+        help
+          Say Y if you want to enable legacy ioctl's on /dev/pmu. This is for
+          programs which use this old interface. New and updated programs
+          should use the backlight classes in sysfs.
 
 config ADB_MACIO
         bool "Include MacIO (CHRP) ADB driver"