hwmon: (jz4740) Convert to devm_hwmon_device_register_with_groups

Use ATTRIBUTE_GROUPS macro and devm_hwmon_device_register_with_groups() to
simplify the code a bit.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/jz4740-hwmon.c

@@ -29,23 +29,13 @@
 
 struct jz4740_hwmon {
 	void __iomem *base;
-
 	int irq;
-
 	const struct mfd_cell *cell;
-	struct device *hwmon;
-
+	struct platform_device *pdev;
 	struct completion read_completion;
-
 	struct mutex lock;
 };
 
-static ssize_t jz4740_hwmon_show_name(struct device *dev,
-	struct device_attribute *dev_attr, char *buf)
-{
-	return sprintf(buf, "jz4740\n");
-}
-
 static irqreturn_t jz4740_hwmon_irq(int irq, void *data)
 {
 	struct jz4740_hwmon *hwmon = data;
@@ -58,6 +48,7 @@ static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
 	struct device_attribute *dev_attr, char *buf)
 {
 	struct jz4740_hwmon *hwmon = dev_get_drvdata(dev);
+	struct platform_device *pdev = hwmon->pdev;
 	struct completion *completion = &hwmon->read_completion;
 	long t;
 	unsigned long val;
@@ -68,7 +59,7 @@ static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
 	reinit_completion(completion);
 
 	enable_irq(hwmon->irq);
-	hwmon->cell->enable(to_platform_device(dev));
+	hwmon->cell->enable(pdev);
 
 	t = wait_for_completion_interruptible_timeout(completion, HZ);
 
@@ -80,7 +71,7 @@ static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
 		ret = t ? t : -ETIMEDOUT;
 	}
 
-	hwmon->cell->disable(to_platform_device(dev));
+	hwmon->cell->disable(pdev);
 	disable_irq(hwmon->irq);
 
 	mutex_unlock(&hwmon->lock);
@@ -88,26 +79,24 @@ static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
 	return ret;
 }
 
-static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL);
 static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL);
 
-static struct attribute *jz4740_hwmon_attributes[] = {
-	&dev_attr_name.attr,
+static struct attribute *jz4740_attrs[] = {
 	&dev_attr_in0_input.attr,
 	NULL
 };
 
-static const struct attribute_group jz4740_hwmon_attr_group = {
-	.attrs = jz4740_hwmon_attributes,
-};
+ATTRIBUTE_GROUPS(jz4740);
 
 static int jz4740_hwmon_probe(struct platform_device *pdev)
 {
 	int ret;
+	struct device *dev = &pdev->dev;
 	struct jz4740_hwmon *hwmon;
+	struct device *hwmon_dev;
 	struct resource *mem;
 
-	hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
+	hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
 	if (!hwmon)
 		return -ENOMEM;
 
@@ -125,12 +114,11 @@ static int jz4740_hwmon_probe(struct platform_device *pdev)
 	if (IS_ERR(hwmon->base))
 		return PTR_ERR(hwmon->base);
 
+	hwmon->pdev = pdev;
 	init_completion(&hwmon->read_completion);
 	mutex_init(&hwmon->lock);
 
-	platform_set_drvdata(pdev, hwmon);
-
-	ret = devm_request_irq(&pdev->dev, hwmon->irq, jz4740_hwmon_irq, 0,
+	ret = devm_request_irq(dev, hwmon->irq, jz4740_hwmon_irq, 0,
 			       pdev->name, hwmon);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
@@ -138,38 +126,13 @@ static int jz4740_hwmon_probe(struct platform_device *pdev)
 	}
 	disable_irq(hwmon->irq);
 
-	ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret);
-		return ret;
-	}
-
-	hwmon->hwmon = hwmon_device_register(&pdev->dev);
-	if (IS_ERR(hwmon->hwmon)) {
-		ret = PTR_ERR(hwmon->hwmon);
-		goto err_remove_file;
-	}
-
-	return 0;
-
-err_remove_file:
-	sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
-	return ret;
-}
-
-static int jz4740_hwmon_remove(struct platform_device *pdev)
-{
-	struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev);
-
-	hwmon_device_unregister(hwmon->hwmon);
-	sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
-
-	return 0;
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "jz4740", hwmon,
+							   jz4740_groups);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 static struct platform_driver jz4740_hwmon_driver = {
 	.probe	= jz4740_hwmon_probe,
-	.remove = jz4740_hwmon_remove,
 	.driver = {
 		.name = "jz4740-hwmon",
 	},