diff options
| author | Michael Hanselmann <linux-kernel@hansmi.ch> | 2006-06-28 04:26:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-28 14:59:06 -0700 |
| commit | cab267c65f44337974e4f1eae490b21dce0e9811 (patch) | |
| tree | d752bda111449ae7e9b7c85988f2993a9a068128 /arch/powerpc | |
| parent | 96febe9fb7b04f2a078882d08bd6a997dee7cfa3 (diff) | |
[PATCH] powermac backlight fixes
Fix a erroneous calculation of the legacy brightness values as reported by
Paul Collins. Additionally, it moves the calculation of the negative value
in the radeonfb driver after the value check.
Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Paul Collins <paul@briny.ondioline.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/powermac/backlight.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powermac/backlight.c b/arch/powerpc/platforms/powermac/backlight.c index 498b042e183..c7a27eddca6 100644 --- a/arch/powerpc/platforms/powermac/backlight.c +++ b/arch/powerpc/platforms/powermac/backlight.c @@ -119,7 +119,14 @@ int pmac_backlight_set_legacy_brightness(int brightness) down(&pmac_backlight->sem); props = pmac_backlight->props; props->brightness = brightness * - props->max_brightness / OLD_BACKLIGHT_MAX; + (props->max_brightness + 1) / + (OLD_BACKLIGHT_MAX + 1); + + if (props->brightness > props->max_brightness) + props->brightness = props->max_brightness; + else if (props->brightness < 0) + props->brightness = 0; + props->update_status(pmac_backlight); up(&pmac_backlight->sem); @@ -140,8 +147,11 @@ int pmac_backlight_get_legacy_brightness() down(&pmac_backlight->sem); props = pmac_backlight->props; + result = props->brightness * - OLD_BACKLIGHT_MAX / props->max_brightness; + (OLD_BACKLIGHT_MAX + 1) / + (props->max_brightness + 1); + up(&pmac_backlight->sem); } mutex_unlock(&pmac_backlight_mutex); |