regulator: ab8500-ext: Register as a device in its own right

Some platforms don't support the AB8500 external regulators, so instead
of having a list of is_<platform>() calls prior to calling
ab8500_ext_regulator_init() from ab8500_regulator_probe(), we can only
register as a platform device on platforms which require them. It means
we also have more control over them when booting with Device Tree.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonielinaro.org>

drivers/regulator/ab8500-ext.c

@@ -333,7 +333,7 @@ static struct ab8500_ext_regulator_info
 	},
 };
 
-int ab8500_ext_regulator_init(struct platform_device *pdev)
+int ab8500_ext_regulator_probe(struct platform_device *pdev)
 {
 	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
 	struct ab8500_platform_data *ppdata;
@@ -409,7 +409,7 @@ int ab8500_ext_regulator_init(struct platform_device *pdev)
 	return 0;
 }
 
-void ab8500_ext_regulator_exit(struct platform_device *pdev)
+int ab8500_ext_regulator_remove(struct platform_device *pdev)
 {
 	int i;
 
@@ -422,7 +422,36 @@ void ab8500_ext_regulator_exit(struct platform_device *pdev)
 
 		regulator_unregister(info->rdev);
 	}
+
+	return 0;
+}
+
+static struct platform_driver ab8500_ext_regulator_driver = {
+	.probe = ab8500_ext_regulator_probe,
+	.remove = ab8500_ext_regulator_remove,
+	.driver         = {
+		.name   = "ab8500-ext-regulator",
+		.owner  = THIS_MODULE,
+	},
+};
+
+static int __init ab8500_ext_regulator_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&ab8500_ext_regulator_driver);
+	if (ret)
+		pr_err("Failed to register ab8500 ext regulator: %d\n", ret);
+
+	return ret;
+}
+subsys_initcall(ab8500_ext_regulator_init);
+
+static void __exit ab8500_ext_regulator_exit(void)
+{
+	platform_driver_unregister(&ab8500_ext_regulator_driver);
 }
+module_exit(ab8500_ext_regulator_exit);
 
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>");

drivers/regulator/ab8500.c

@@ -3156,22 +3156,12 @@ static int ab8500_regulator_probe(struct platform_device *pdev)
 			return err;
 	}
 
-	if (!is_ab8505(ab8500)) {
-		/* register external regulators (before Vaux1, 2 and 3) */
-		err = ab8500_ext_regulator_init(pdev);
-		if (err)
-			return err;
-	}
-
 	/* register all regulators */
 	for (i = 0; i < abx500_regulator.info_size; i++) {
 		err = ab8500_regulator_register(pdev, &pdata->regulator[i],
 						i, NULL);
-		if (err < 0) {
-			if (!is_ab8505(ab8500))
-				ab8500_ext_regulator_exit(pdev);
+		if (err < 0)
 			return err;
-		}
 	}
 
 	return 0;
@@ -3180,7 +3170,6 @@ static int ab8500_regulator_probe(struct platform_device *pdev)
 static int ab8500_regulator_remove(struct platform_device *pdev)
 {
 	int i, err;
-	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
 
 	for (i = 0; i < abx500_regulator.info_size; i++) {
 		struct ab8500_regulator_info *info = NULL;
@@ -3192,10 +3181,6 @@ static int ab8500_regulator_remove(struct platform_device *pdev)
 		regulator_unregister(info->regulator);
 	}
 
-	/* remove external regulators (after Vaux1, 2 and 3) */
-	if (!is_ab8505(ab8500))
-		ab8500_ext_regulator_exit(pdev);
-
 	/* remove regulator debug */
 	err = ab8500_regulator_debug_exit(pdev);
 	if (err)

include/linux/regulator/ab8500.h

@@ -336,8 +336,4 @@ static inline int ab8500_regulator_debug_exit(struct platform_device *pdev)
 }
 #endif
 
-/* AB8500 external regulator functions. */
-int ab8500_ext_regulator_init(struct platform_device *pdev);
-void ab8500_ext_regulator_exit(struct platform_device *pdev);
-
 #endif