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[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>
This commit is contained in:
Michael Hanselmann 2006-06-28 04:26:55 -07:00 committed by Linus Torvalds
parent 96febe9fb7
commit cab267c65f
2 changed files with 15 additions and 5 deletions
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14
arch/powerpc/platforms/powermac/backlight.c
View File

@ -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);

6
drivers/video/aty/radeon_backlight.c
View File

@ -40,14 +40,14 @@ static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
mutex_unlock(&info->bl_mutex);
if (pdata->negative)
rlevel = MAX_RADEON_LEVEL - rlevel;
if (rlevel < 0)
rlevel = 0;
else if (rlevel > MAX_RADEON_LEVEL)
rlevel = MAX_RADEON_LEVEL;
if (pdata->negative)
rlevel = MAX_RADEON_LEVEL - rlevel;
return rlevel;
}