ACPI: Implement acpi_video_get_next_level()

acpi_video_get_next_level was supposed to implement an algorithm to select
a new brightness level based on the old brightness level of an ACPI video
device, but it simply says "/* Fix me */" and returns the current
brightness.

This patch implements acpi_video_get_next_level properly.  It had to change
a few constants at the top of the file because they were (apparently)
wrong, but it appears to work on my Dell Inspiron e1405 (with BIOS A05
only--BIOS A04 doesn't seem to send ACPI video hotkey events).

[akpm@osdl.org: cleanups]
Signed-off-by: Thomas Tuttle <linux-kernel@ttuttle.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 56666a9824760bc0fbf569aba85518a38ce995cb..9200a46c38bdda5eeb2f2af0bd69dc0ecfb0f883 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -3,6 +3,7 @@
  *
  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
+ *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
@@ -47,11 +48,11 @@
 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT  0x83
 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT  0x84
 
-#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS     0x82
-#define        ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x83
-#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS       0x84
-#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS      0x85
-#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF          0x86
+#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS     0x85
+#define        ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
+#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS       0x87
+#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS      0x88
+#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF          0x89
 
 #define ACPI_VIDEO_HEAD_INVALID                (~0u - 1)
 #define ACPI_VIDEO_HEAD_END            (~0u)
@@ -1509,8 +1510,34 @@ static int
 acpi_video_get_next_level(struct acpi_video_device *device,
                          u32 level_current, u32 event)
 {
-       /*Fix me */
-       return level_current;
+       int min, max, min_above, max_below, i, l;
+       max = max_below = 0;
+       min = min_above = 255;
+       for (i = 0; i < device->brightness->count; i++) {
+               l = device->brightness->levels[i];
+               if (l < min)
+                       min = l;
+               if (l > max)
+                       max = l;
+               if (l < min_above && l > level_current)
+                       min_above = l;
+               if (l > max_below && l < level_current)
+                       max_below = l;
+       }
+
+       switch (event) {
+       case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
+               return (level_current < max) ? min_above : min;
+       case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
+               return (level_current < max) ? min_above : max;
+       case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
+               return (level_current > min) ? max_below : min;
+       case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
+       case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
+               return 0;
+       default:
+               return level_current;
+       }
 }
 
 static void