[ARM] 5044/1: pwm_bl: add init/notify/exit callbacks

This allows platform code to manipulate GPIOs and brightness level as
needed.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 32 insertions, 7 deletions

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 9637f5e08cb6..8346dfc01cf6 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -23,6 +23,7 @@
 struct pwm_bl_data {
         struct pwm_device       *pwm;
         unsigned int            period;
+        int                     (*notify)(int brightness);
 };
 
 static int pwm_backlight_update_status(struct backlight_device *bl)
@@ -37,6 +38,9 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
                 brightness = 0;
 
+        if (pb->notify)
+                brightness = pb->notify(brightness);
+
         if (brightness == 0) {
                 pwm_config(pb->pwm, 0, pb->period);
                 pwm_disable(pb->pwm);
@@ -62,30 +66,39 @@ static int pwm_backlight_probe(struct platform_device *pdev)
         struct platform_pwm_backlight_data *data = pdev->dev.platform_data;
         struct backlight_device *bl;
         struct pwm_bl_data *pb;
+        int ret;
 
         if (!data)
                 return -EINVAL;
 
+        if (data->init) {
+                ret = data->init(&pdev->dev);
+                if (ret < 0)
+                        return ret;
+        }
+
         pb = kzalloc(sizeof(*pb), GFP_KERNEL);
-        if (!pb)
-                return -ENOMEM;
+        if (!pb) {
+                ret = -ENOMEM;
+                goto err_alloc;
+        }
 
         pb->period = data->pwm_period_ns;
+        pb->notify = data->notify;
 
         pb->pwm = pwm_request(data->pwm_id, "backlight");
         if (pb->pwm == NULL) {
                 dev_err(&pdev->dev, "unable to request PWM for backlight\n");
-                kfree(pb);
-                return -EBUSY;
+                ret = -EBUSY;
+                goto err_pwm;
         }
 
         bl = backlight_device_register(pdev->name, &pdev->dev,
                         pb, &pwm_backlight_ops);
         if (IS_ERR(bl)) {
                 dev_err(&pdev->dev, "failed to register backlight\n");
-                pwm_free(pb->pwm);
-                kfree(pb);
-                return PTR_ERR(bl);
+                ret = PTR_ERR(bl);
+                goto err_bl;
         }
 
         bl->props.max_brightness = data->max_brightness;
@@ -94,10 +107,20 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, bl);
         return 0;
+
+err_bl:
+        pwm_free(pb->pwm);
+err_pwm:
+        kfree(pb);
+err_alloc:
+        if (data->exit)
+                data->exit(&pdev->dev);
+        return ret;
 }
 
 static int pwm_backlight_remove(struct platform_device *pdev)
 {
+        struct platform_pwm_backlight_data *data = pdev->dev.platform_data;
         struct backlight_device *bl = platform_get_drvdata(pdev);
         struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
 
@@ -106,6 +129,8 @@ static int pwm_backlight_remove(struct platform_device *pdev)
         pwm_disable(pb->pwm);
         pwm_free(pb->pwm);
         kfree(pb);
+        if (data->exit)
+                data->exit(&pdev->dev);
         return 0;
 }