backlight: Convert from struct class_device to struct device

Convert the backlight and LCD classes from struct class_device
to struct device since class_device is scheduled for removal.

One nasty API break is the backlight power attribute has had to be
renamed to bl_power and the LCD power attribute has had to be renamed
to lcd_power since the original names clash with the core. I can't see
a way around this.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 53 insertions, 72 deletions

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 7e06223bca94..b26de8cf3112 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -69,18 +69,20 @@ static inline void backlight_unregister_fb(struct backlight_device *bd)
 }
 #endif /* CONFIG_FB */
 
-static ssize_t backlight_show_power(struct class_device *cdev, char *buf)
+static ssize_t backlight_show_power(struct device *dev,
+		struct device_attribute *attr,char *buf)
 {
-	struct backlight_device *bd = to_backlight_device(cdev);
+	struct backlight_device *bd = to_backlight_device(dev);
 
 	return sprintf(buf, "%d\n", bd->props.power);
 }
 
-static ssize_t backlight_store_power(struct class_device *cdev, const char *buf, size_t count)
+static ssize_t backlight_store_power(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
 {
 	int rc = -ENXIO;
 	char *endp;
-	struct backlight_device *bd = to_backlight_device(cdev);
+	struct backlight_device *bd = to_backlight_device(dev);
 	int power = simple_strtoul(buf, &endp, 0);
 	size_t size = endp - buf;
 
@@ -101,18 +103,20 @@ static ssize_t backlight_store_power(struct class_device *cdev, const char *buf,
 	return rc;
 }
 
-static ssize_t backlight_show_brightness(struct class_device *cdev, char *buf)
+static ssize_t backlight_show_brightness(struct device *dev,
+		struct device_attribute *attr, char *buf)
 {
-	struct backlight_device *bd = to_backlight_device(cdev);
+	struct backlight_device *bd = to_backlight_device(dev);
 
 	return sprintf(buf, "%d\n", bd->props.brightness);
 }
 
-static ssize_t backlight_store_brightness(struct class_device *cdev, const char *buf, size_t count)
+static ssize_t backlight_store_brightness(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
 {
 	int rc = -ENXIO;
 	char *endp;
-	struct backlight_device *bd = to_backlight_device(cdev);
+	struct backlight_device *bd = to_backlight_device(dev);
 	int brightness = simple_strtoul(buf, &endp, 0);
 	size_t size = endp - buf;
 
@@ -138,18 +142,19 @@ static ssize_t backlight_store_brightness(struct class_device *cdev, const char
 	return rc;
 }
 
-static ssize_t backlight_show_max_brightness(struct class_device *cdev, char *buf)
+static ssize_t backlight_show_max_brightness(struct device *dev,
+		struct device_attribute *attr, char *buf)
 {
-	struct backlight_device *bd = to_backlight_device(cdev);
+	struct backlight_device *bd = to_backlight_device(dev);
 
 	return sprintf(buf, "%d\n", bd->props.max_brightness);
 }
 
-static ssize_t backlight_show_actual_brightness(struct class_device *cdev,
-						char *buf)
+static ssize_t backlight_show_actual_brightness(struct device *dev,
+		struct device_attribute *attr, char *buf)
 {
 	int rc = -ENXIO;
-	struct backlight_device *bd = to_backlight_device(cdev);
+	struct backlight_device *bd = to_backlight_device(dev);
 
 	mutex_lock(&bd->ops_lock);
 	if (bd->ops && bd->ops->get_brightness)
@@ -159,31 +164,22 @@ static ssize_t backlight_show_actual_brightness(struct class_device *cdev,
 	return rc;
 }
 
-static void backlight_class_release(struct class_device *dev)
+struct class *backlight_class;
+
+static void bl_device_release(struct device *dev)
 {
 	struct backlight_device *bd = to_backlight_device(dev);
 	kfree(bd);
 }
 
-static struct class backlight_class = {
-	.name = "backlight",
-	.release = backlight_class_release,
-};
-
-#define DECLARE_ATTR(_name,_mode,_show,_store)			\
-{							 	\
-	.attr	= { .name = __stringify(_name), .mode = _mode }, \
-	.show	= _show,					\
-	.store	= _store,					\
-}
-
-static const 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,
+static struct device_attribute bl_device_attributes[] = {
+	__ATTR(bl_power, 0644, backlight_show_power, backlight_store_power),
+	__ATTR(brightness, 0644, backlight_show_brightness,
 		     backlight_store_brightness),
-	DECLARE_ATTR(actual_brightness, 0444, backlight_show_actual_brightness,
+	__ATTR(actual_brightness, 0444, backlight_show_actual_brightness,
 		     NULL),
-	DECLARE_ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL),
+	__ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL),
+	__ATTR_NULL,
 };
 
 /**
@@ -191,22 +187,20 @@ static const struct class_device_attribute bl_class_device_attributes[] = {
  *   backlight_device class.
  * @name: the name of the new object(must be the same as the name of the
  *   respective framebuffer device).
- * @devdata: an optional pointer to be stored in the class_device. The
- *   methods may retrieve it by using class_get_devdata(&bd->class_dev).
+ * @devdata: an optional pointer to be stored for private driver use. The
+ *   methods may retrieve it by using bl_get_data(bd).
  * @ops: the backlight operations structure.
  *
- * Creates and registers new backlight class_device. Returns either an
+ * Creates and registers new backlight device. Returns either an
  * ERR_PTR() or a pointer to the newly allocated device.
  */
 struct backlight_device *backlight_device_register(const char *name,
-	struct device *dev,
-	void *devdata,
-	struct backlight_ops *ops)
+		struct device *parent, void *devdata, struct backlight_ops *ops)
 {
-	int i, rc;
 	struct backlight_device *new_bd;
+	int rc;
 
-	pr_debug("backlight_device_alloc: name=%s\n", name);
+	pr_debug("backlight_device_register: name=%s\n", name);
 
 	new_bd = kzalloc(sizeof(struct backlight_device), GFP_KERNEL);
 	if (!new_bd)
@@ -214,13 +208,14 @@ struct backlight_device *backlight_device_register(const char *name,
 
 	mutex_init(&new_bd->update_lock);
 	mutex_init(&new_bd->ops_lock);
-	new_bd->ops = ops;
-	new_bd->class_dev.class = &backlight_class;
-	new_bd->class_dev.dev = dev;
-	strlcpy(new_bd->class_dev.class_id, name, KOBJ_NAME_LEN);
-	class_set_devdata(&new_bd->class_dev, devdata);
 
-	rc = class_device_register(&new_bd->class_dev);
+	new_bd->dev.class = backlight_class;
+	new_bd->dev.parent = parent;
+	new_bd->dev.release = bl_device_release;
+	strlcpy(new_bd->dev.bus_id, name, BUS_ID_SIZE);
+	dev_set_drvdata(&new_bd->dev, devdata);
+
+	rc = device_register(&new_bd->dev);
 	if (rc) {
 		kfree(new_bd);
 		return ERR_PTR(rc);
@@ -228,23 +223,11 @@ struct backlight_device *backlight_device_register(const char *name,
 
 	rc = backlight_register_fb(new_bd);
 	if (rc) {
-		class_device_unregister(&new_bd->class_dev);
+		device_unregister(&new_bd->dev);
 		return ERR_PTR(rc);
 	}
 
-
-	for (i = 0; i < ARRAY_SIZE(bl_class_device_attributes); i++) {
-		rc = class_device_create_file(&new_bd->class_dev,
-					      &bl_class_device_attributes[i]);
-		if (rc) {
-			while (--i >= 0)
-				class_device_remove_file(&new_bd->class_dev,
-							 &bl_class_device_attributes[i]);
-			class_device_unregister(&new_bd->class_dev);
-			/* No need to kfree(new_bd) since release() method was called */
-			return ERR_PTR(rc);
-		}
-	}
+	new_bd->ops = ops;
 
 #ifdef CONFIG_PMAC_BACKLIGHT
 	mutex_lock(&pmac_backlight_mutex);
@@ -265,42 +248,40 @@ EXPORT_SYMBOL(backlight_device_register);
  */
 void backlight_device_unregister(struct backlight_device *bd)
 {
-	int i;
-
 	if (!bd)
 		return;
 
-	pr_debug("backlight_device_unregister: name=%s\n", bd->class_dev.class_id);
-
 #ifdef CONFIG_PMAC_BACKLIGHT
 	mutex_lock(&pmac_backlight_mutex);
 	if (pmac_backlight == bd)
 		pmac_backlight = NULL;
 	mutex_unlock(&pmac_backlight_mutex);
 #endif
-
-	for (i = 0; i < ARRAY_SIZE(bl_class_device_attributes); i++)
-		class_device_remove_file(&bd->class_dev,
-					 &bl_class_device_attributes[i]);
-
 	mutex_lock(&bd->ops_lock);
 	bd->ops = NULL;
 	mutex_unlock(&bd->ops_lock);
 
 	backlight_unregister_fb(bd);
-
-	class_device_unregister(&bd->class_dev);
+	device_unregister(&bd->dev);
 }
 EXPORT_SYMBOL(backlight_device_unregister);
 
 static void __exit backlight_class_exit(void)
 {
-	class_unregister(&backlight_class);
+	class_destroy(backlight_class);
 }
 
 static int __init backlight_class_init(void)
 {
-	return class_register(&backlight_class);
+	backlight_class = class_create(THIS_MODULE, "backlight");
+	if (IS_ERR(backlight_class)) {
+		printk(KERN_WARNING "Unable to create backlight class; errno = %ld\n",
+				PTR_ERR(backlight_class));
+		return PTR_ERR(backlight_class);
+	}
+
+	backlight_class->dev_attrs = bl_device_attributes;
+	return 0;
 }
 
 /*