extcon: Add extcon_alloc_groups to simplify extcon register function

The alloc groups is functionalized from extcon_dev_register.

Signed-off-by: Bumwoo Lee <bw365.lee@samsung.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 39 insertions, 22 deletions

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 3188b0e8c6d9..3997b39680b7 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -1188,6 +1188,42 @@ static int extcon_alloc_muex(struct extcon_dev *edev)
 }
 
 /**
+ * extcon_alloc_groups() - alloc the groups for extcon device
+ * @edev:	extcon device
+ *
+ * Returns 0 if success or error number if fail.
+ */
+static int extcon_alloc_groups(struct extcon_dev *edev)
+{
+	int index;
+
+	if (!edev)
+		return -EINVAL;
+
+	if (!edev->max_supported)
+		return 0;
+
+	edev->extcon_dev_type.groups = kcalloc(edev->max_supported + 2,
+			sizeof(struct attribute_group *),
+			GFP_KERNEL);
+	if (!edev->extcon_dev_type.groups)
+		return -ENOMEM;
+
+	edev->extcon_dev_type.name = dev_name(&edev->dev);
+	edev->extcon_dev_type.release = dummy_sysfs_dev_release;
+
+	for (index = 0; index < edev->max_supported; index++)
+		edev->extcon_dev_type.groups[index] = &edev->cables[index].attr_g;
+
+	if (edev->mutually_exclusive)
+		edev->extcon_dev_type.groups[index] = &edev->attr_g_muex;
+
+	edev->dev.type = &edev->extcon_dev_type;
+
+	return 0;
+}
+
+/**
  * extcon_dev_register() - Register an new extcon device
  * @edev:	the extcon device to be registered
  *
@@ -1242,28 +1278,9 @@ int extcon_dev_register(struct extcon_dev *edev)
 	if (ret < 0)
 		goto err_alloc_muex;
 
-	if (edev->max_supported) {
-		edev->extcon_dev_type.groups =
-			kcalloc(edev->max_supported + 2,
-				sizeof(struct attribute_group *),
-				GFP_KERNEL);
-		if (!edev->extcon_dev_type.groups) {
-			ret = -ENOMEM;
-			goto err_alloc_groups;
-		}
-
-		edev->extcon_dev_type.name = dev_name(&edev->dev);
-		edev->extcon_dev_type.release = dummy_sysfs_dev_release;
-
-		for (index = 0; index < edev->max_supported; index++)
-			edev->extcon_dev_type.groups[index] =
-				&edev->cables[index].attr_g;
-		if (edev->mutually_exclusive)
-			edev->extcon_dev_type.groups[index] =
-				&edev->attr_g_muex;
-
-		edev->dev.type = &edev->extcon_dev_type;
-	}
+	ret = extcon_alloc_groups(edev);
+	if (ret < 0)
+		goto err_alloc_groups;
 
 	spin_lock_init(&edev->lock);
 	if (edev->max_supported) {