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;
 }
 
 /*