backlight: add a callback 'notify_after' for backlight control
Dilan Lee [Thu, 25 Aug 2011 22:59:17 +0000 (15:59 -0700)]
We need a callback to do some things after pwm_enable, pwm_disable
and pwm_config.

Signed-off-by: Dilan Lee <dilee@nvidia.com>
Reviewed-by: Robert Morell <rmorell@nvidia.com>
Reviewed-by: Arun Murthy <arun.murthy@stericsson.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/backlight/pwm_bl.c
include/linux/pwm_backlight.h

index b8f38ec..8b5b2a4 100644 (file)
@@ -28,6 +28,8 @@ struct pwm_bl_data {
        unsigned int            lth_brightness;
        int                     (*notify)(struct device *,
                                          int brightness);
+       void                    (*notify_after)(struct device *,
+                                       int brightness);
        int                     (*check_fb)(struct device *, struct fb_info *);
 };
 
@@ -55,6 +57,10 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
                pwm_config(pb->pwm, brightness, pb->period);
                pwm_enable(pb->pwm);
        }
+
+       if (pb->notify_after)
+               pb->notify_after(pb->dev, brightness);
+
        return 0;
 }
 
@@ -105,6 +111,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 
        pb->period = data->pwm_period_ns;
        pb->notify = data->notify;
+       pb->notify_after = data->notify_after;
        pb->check_fb = data->check_fb;
        pb->lth_brightness = data->lth_brightness *
                (data->pwm_period_ns / data->max_brightness);
@@ -172,6 +179,8 @@ static int pwm_backlight_suspend(struct platform_device *pdev,
                pb->notify(pb->dev, 0);
        pwm_config(pb->pwm, 0, pb->period);
        pwm_disable(pb->pwm);
+       if (pb->notify_after)
+               pb->notify_after(pb->dev, 0);
        return 0;
 }
 
index 5e3e25a..63d2df4 100644 (file)
@@ -14,6 +14,7 @@ struct platform_pwm_backlight_data {
        unsigned int pwm_period_ns;
        int (*init)(struct device *dev);
        int (*notify)(struct device *dev, int brightness);
+       void (*notify_after)(struct device *dev, int brightness);
        void (*exit)(struct device *dev);
        int (*check_fb)(struct device *dev, struct fb_info *info);
 };