iio: magnetometer: ak8975: Use devm_* APIs

This patch use devm_* APIs make driver simpler.
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/magnetometer/ak8975.c

@@ -165,7 +165,7 @@ static int ak8975_setup_irq(struct ak8975_data *data)
 	else
 		irq = gpio_to_irq(data->eoc_gpio);
 
-	rc = request_irq(irq, ak8975_irq_handler,
+	rc = devm_request_irq(&client->dev, irq, ak8975_irq_handler,
 			 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 			 dev_name(&client->dev), data);
 	if (rc < 0) {
@@ -520,21 +520,21 @@ static int ak8975_probe(struct i2c_client *client,
 	/* We may not have a GPIO based IRQ to scan, that is fine, we will
 	   poll if so */
 	if (gpio_is_valid(eoc_gpio)) {
-		err = gpio_request_one(eoc_gpio, GPIOF_IN, "ak_8975");
+		err = devm_gpio_request_one(&client->dev, eoc_gpio,
+							GPIOF_IN, "ak_8975");
 		if (err < 0) {
 			dev_err(&client->dev,
 				"failed to request GPIO %d, error %d\n",
 							eoc_gpio, err);
-			goto exit;
+			return err;
 		}
 	}
 
 	/* Register with IIO */
-	indio_dev = iio_device_alloc(sizeof(*data));
-	if (indio_dev == NULL) {
-		err = -ENOMEM;
-		goto exit_gpio;
-	}
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 
@@ -549,17 +549,16 @@ static int ak8975_probe(struct i2c_client *client,
 		name = (char *) id->name;
 	} else if (ACPI_HANDLE(&client->dev))
 		name = ak8975_match_acpi_device(&client->dev, &data->chipset);
-	else {
-		err = -ENOSYS;
-		goto exit_free_iio;
-	}
+	else
+		return -ENOSYS;
+
 	dev_dbg(&client->dev, "Asahi compass chip %s\n", name);
 
 	/* Perform some basic start-of-day setup of the device. */
 	err = ak8975_setup(client);
 	if (err < 0) {
 		dev_err(&client->dev, "AK8975 initialization fails\n");
-		goto exit_free_iio;
+		return err;
 	}
 
 	data->client = client;
@@ -571,37 +570,9 @@ static int ak8975_probe(struct i2c_client *client,
 	indio_dev->info = &ak8975_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->name = name;
-	err = iio_device_register(indio_dev);
+	err = devm_iio_device_register(&client->dev, indio_dev);
 	if (err < 0)
-		goto exit_free_iio;
-
-	return 0;
-
-exit_free_iio:
-	iio_device_free(indio_dev);
-	if (data->eoc_irq)
-		free_irq(data->eoc_irq, data);
-exit_gpio:
-	if (gpio_is_valid(eoc_gpio))
-		gpio_free(eoc_gpio);
-exit:
 		return err;
-}
-
-static int ak8975_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-	struct ak8975_data *data = iio_priv(indio_dev);
-
-	iio_device_unregister(indio_dev);
-
-	if (data->eoc_irq)
-		free_irq(data->eoc_irq, data);
-
-	if (gpio_is_valid(data->eoc_gpio))
-		gpio_free(data->eoc_gpio);
-
-	iio_device_free(indio_dev);
 
 	return 0;
 }
@@ -628,7 +599,6 @@ static struct i2c_driver ak8975_driver = {
 		.acpi_match_table = ACPI_PTR(ak_acpi_match),
 	},
 	.probe		= ak8975_probe,
-	.remove		= ak8975_remove,
 	.id_table	= ak8975_id,
 };
 module_i2c_driver(ak8975_driver);