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apple-gmux: Add suspend/resume support for the backlight 

After S3, the brightness might not be restored to the pre-suspend value.
Request status update calls from the backlight core on suspend/resume to
ensure the brightness value is restored.

Reported-and-tested-by: Austin Lund <austin.lund@gmail.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Seth Forshee 2012-04-19 10:55:35 -05:00 committed by Matthew Garrett
parent bc7ab495c7
commit 96960880c3
1 changed files with 4 additions and 0 deletions
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4
drivers/platform/x86/apple-gmux.c
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@ -87,6 +87,9 @@ static int gmux_update_status(struct backlight_device *bd)
struct apple_gmux_data *gmux_data = bl_get_data(bd);
u32 brightness = bd->props.brightness;
if (bd->props.state & BL_CORE_SUSPENDED)
brightness = 0;
/*
* Older gmux versions require writing out lower bytes first then
* setting the upper byte to 0 to flush the values. Newer versions
@ -102,6 +105,7 @@ static int gmux_update_status(struct backlight_device *bd)
}
static const struct backlight_ops gmux_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = gmux_get_brightness,
.update_status = gmux_update_status,
};