Re: [PATCH 5/5] iio: magnetometer: ak8975: Use devm_* APIs

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On 18/06/14 07:21, Beomho Seo wrote:
This patch use devm_* APIs and make driver simpler.

Signed-off-by: Beomho Seo <beomho.seo@xxxxxxxxxxx>
Hi,

Comments in line.

J
---
  drivers/iio/magnetometer/ak8975.c |   48 ++++++++-----------------------------
  1 file changed, 10 insertions(+), 38 deletions(-)

diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 09ea5c4..ad71160 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/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) {
@@ -520,20 +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));
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
  	if (indio_dev == NULL) {
  		err = -ENOMEM;
-		goto exit_gpio;
+		return err;
return -ENOMEM;
  	}
  	data = iio_priv(indio_dev);
  	i2c_set_clientdata(client, indio_dev);
@@ -551,7 +552,7 @@ static int ak8975_probe(struct i2c_client *client,
  		name = ak8975_match_acpi_device(&client->dev, &data->chipset);
  	else {
  		err = -ENOSYS;
-		goto exit_free_iio;
+		return err;
If you are going to do this, please just return -ENOSYS directly rather than
leaving the intermediate step.
  	}
  	dev_dbg(&client->dev, "Asahi compass chip %s\n", name);

@@ -559,7 +560,7 @@ static int ak8975_probe(struct i2c_client *client,
  	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 +572,9 @@ 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 err;

  	return 0;
  }
@@ -628,7 +601,6 @@ 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);


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