1 files changed, 66 insertions, 32 deletions

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 151fda8dded0..27597c576eff 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -16,14 +16,12 @@
 
 static ssize_t backlight_show_power(struct class_device *cdev, char *buf)
 {
-	int rc;
+	int rc = -ENXIO;
 	struct backlight_device *bd = to_backlight_device(cdev);
 
 	down(&bd->sem);
-	if (likely(bd->props && bd->props->get_power))
-		rc = sprintf(buf, "%d\n", bd->props->get_power(bd));
-	else
-		rc = -ENXIO;
+	if (likely(bd->props))
+		rc = sprintf(buf, "%d\n", bd->props->power);
 	up(&bd->sem);
 
 	return rc;
@@ -31,21 +29,25 @@ static ssize_t backlight_show_power(struct class_device *cdev, char *buf)
 
 static ssize_t backlight_store_power(struct class_device *cdev, const char *buf, size_t count)
 {
-	int rc, power;
+	int rc = -ENXIO;
 	char *endp;
 	struct backlight_device *bd = to_backlight_device(cdev);
+	int power = simple_strtoul(buf, &endp, 0);
+	size_t size = endp - buf;
 
-	power = simple_strtoul(buf, &endp, 0);
-	if (*endp && !isspace(*endp))
+	if (*endp && isspace(*endp))
+		size++;
+	if (size != count)
 		return -EINVAL;
 
 	down(&bd->sem);
-	if (likely(bd->props && bd->props->set_power)) {
+	if (likely(bd->props)) {
 		pr_debug("backlight: set power to %d\n", power);
-		bd->props->set_power(bd, power);
+		bd->props->power = power;
+		if (likely(bd->props->update_status))
+			bd->props->update_status(bd);
 		rc = count;
-	} else
-		rc = -ENXIO;
+	}
 	up(&bd->sem);
 
 	return rc;
@@ -53,14 +55,12 @@ static ssize_t backlight_store_power(struct class_device *cdev, const char *buf,
 
 static ssize_t backlight_show_brightness(struct class_device *cdev, char *buf)
 {
-	int rc;
+	int rc = -ENXIO;
 	struct backlight_device *bd = to_backlight_device(cdev);
 
 	down(&bd->sem);
-	if (likely(bd->props && bd->props->get_brightness))
-		rc = sprintf(buf, "%d\n", bd->props->get_brightness(bd));
-	else
-		rc = -ENXIO;
+	if (likely(bd->props))
+		rc = sprintf(buf, "%d\n", bd->props->brightness);
 	up(&bd->sem);
 
 	return rc;
@@ -68,21 +68,30 @@ static ssize_t backlight_show_brightness(struct class_device *cdev, char *buf)
 
 static ssize_t backlight_store_brightness(struct class_device *cdev, const char *buf, size_t count)
 {
-	int rc, brightness;
+	int rc = -ENXIO;
 	char *endp;
 	struct backlight_device *bd = to_backlight_device(cdev);
+	int brightness = simple_strtoul(buf, &endp, 0);
+	size_t size = endp - buf;
 
-	brightness = simple_strtoul(buf, &endp, 0);
-	if (*endp && !isspace(*endp))
+	if (*endp && isspace(*endp))
+		size++;
+	if (size != count)
 		return -EINVAL;
 
 	down(&bd->sem);
-	if (likely(bd->props && bd->props->set_brightness)) {
-		pr_debug("backlight: set brightness to %d\n", brightness);
-		bd->props->set_brightness(bd, brightness);
-		rc = count;
-	} else
-		rc = -ENXIO;
+	if (likely(bd->props)) {
+		if (brightness > bd->props->max_brightness)
+			rc = -EINVAL;
+		else {
+			pr_debug("backlight: set brightness to %d\n",
+				 brightness);
+			bd->props->brightness = brightness;
+			if (likely(bd->props->update_status))
+				bd->props->update_status(bd);
+			rc = count;
+		}
+	}
 	up(&bd->sem);
 
 	return rc;
@@ -90,14 +99,26 @@ static ssize_t backlight_store_brightness(struct class_device *cdev, const char
 
 static ssize_t backlight_show_max_brightness(struct class_device *cdev, char *buf)
 {
-	int rc;
+	int rc = -ENXIO;
 	struct backlight_device *bd = to_backlight_device(cdev);
 
 	down(&bd->sem);
 	if (likely(bd->props))
 		rc = sprintf(buf, "%d\n", bd->props->max_brightness);
-	else
-		rc = -ENXIO;
+	up(&bd->sem);
+
+	return rc;
+}
+
+static ssize_t backlight_show_actual_brightness(struct class_device *cdev,
+						char *buf)
+{
+	int rc = -ENXIO;
+	struct backlight_device *bd = to_backlight_device(cdev);
+
+	down(&bd->sem);
+	if (likely(bd->props && bd->props->get_brightness))
+		rc = sprintf(buf, "%d\n", bd->props->get_brightness(bd));
 	up(&bd->sem);
 
 	return rc;
@@ -123,7 +144,10 @@ static struct class backlight_class = {
 
 static struct class_device_attribute bl_class_device_attributes[] = {
 	DECLARE_ATTR(power, 0644, backlight_show_power, backlight_store_power),
-	DECLARE_ATTR(brightness, 0644, backlight_show_brightness, backlight_store_brightness),
+	DECLARE_ATTR(brightness, 0644, backlight_show_brightness,
+		     backlight_store_brightness),
+	DECLARE_ATTR(actual_brightness, 0444, backlight_show_actual_brightness,
+		     NULL),
 	DECLARE_ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL),
 };
 
@@ -144,8 +168,12 @@ static int fb_notifier_callback(struct notifier_block *self,
 	bd = container_of(self, struct backlight_device, fb_notif);
 	down(&bd->sem);
 	if (bd->props)
-		if (!bd->props->check_fb || bd->props->check_fb(evdata->info))
-			bd->props->set_power(bd, *(int *)evdata->data);
+		if (!bd->props->check_fb ||
+		    bd->props->check_fb(evdata->info)) {
+			bd->props->fb_blank = *(int *)evdata->data;
+			if (likely(bd->props && bd->props->update_status))
+				bd->props->update_status(bd);
+		}
 	up(&bd->sem);
 	return 0;
 }
@@ -231,6 +259,12 @@ void backlight_device_unregister(struct backlight_device *bd)
 					 &bl_class_device_attributes[i]);
 
 	down(&bd->sem);
+	if (likely(bd->props && bd->props->update_status)) {
+		bd->props->brightness = 0;
+		bd->props->power = 0;
+		bd->props->update_status(bd);
+	}
+
 	bd->props = NULL;
 	up(&bd->sem);