pwm backlight for nexus 7

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 342b7d7..67bee2e 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -38,17 +38,18 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
        struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
        int brightness = bl->props.brightness;
        int max = bl->props.max_brightness;
+       int poweroff = false;

        if (bl->props.power != FB_BLANK_UNBLANK)
-               brightness = 0;
+               poweroff = true;

        if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-               brightness = 0;
+               poweroff = true;

        if (pb->notify)
                brightness = pb->notify(pb->dev, brightness);

-       if (brightness == 0) {
+       if (poweroff) {
                pwm_config(pb->pwm, 0, pb->period);
                pwm_disable(pb->pwm);
        } else {
@@ -58,6 +59,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
                pwm_enable(pb->pwm);
        }

+       /* maybe this needs to send back 0 if power is off? */
        if (pb->notify_after)
                pb->notify_after(pb->dev, brightness);

@@ -66,6 +68,11 @@ static int pwm_backlight_update_status(struct backlight_device *bl)

 static int pwm_backlight_get_brightness(struct backlight_device *bl)
 {
+       if ((bl->props.power != FB_BLANK_UNBLANK) ||
+           (bl->props.fb_blank != FB_BLANK_UNBLANK) ) {
+               return 0;
+       }
+
        return bl->props.brightness;
 }