staging: iio: cdc: use devm_iio_device_register instead iio_device_register

Replace iio_device_register with resource managed devm_iio_device_register in order
to ease the error path. Also delete de remove function since there is no need after
this change.
Signed-off-by: NIoana Ciornei <ciorneiioana@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/cdc/ad7150.c

@@ -636,7 +636,7 @@ static int ad7150_probe(struct i2c_client *client,
 			return ret;
 	}
 
-	ret = iio_device_register(indio_dev);
+	ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
 	if (ret)
 		return ret;
 
@@ -646,15 +646,6 @@ static int ad7150_probe(struct i2c_client *client,
 	return 0;
 }
 
-static int ad7150_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
-	iio_device_unregister(indio_dev);
-
-	return 0;
-}
-
 static const struct i2c_device_id ad7150_id[] = {
 	{ "ad7150", 0 },
 	{ "ad7151", 0 },
@@ -669,7 +660,6 @@ static struct i2c_driver ad7150_driver = {
 		.name = "ad7150",
 	},
 	.probe = ad7150_probe,
-	.remove = ad7150_remove,
 	.id_table = ad7150_id,
 };
 module_i2c_driver(ad7150_driver);

drivers/staging/iio/cdc/ad7152.c

@@ -502,7 +502,7 @@ static int ad7152_probe(struct i2c_client *client,
 	indio_dev->num_channels = ARRAY_SIZE(ad7152_channels);
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	ret = iio_device_register(indio_dev);
+	ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
 	if (ret)
 		return ret;
 
@@ -511,15 +511,6 @@ static int ad7152_probe(struct i2c_client *client,
 	return 0;
 }
 
-static int ad7152_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
-	iio_device_unregister(indio_dev);
-
-	return 0;
-}
-
 static const struct i2c_device_id ad7152_id[] = {
 	{ "ad7152", 0 },
 	{ "ad7153", 1 },
@@ -533,7 +524,6 @@ static struct i2c_driver ad7152_driver = {
 		.name = KBUILD_MODNAME,
 	},
 	.probe = ad7152_probe,
-	.remove = ad7152_remove,
 	.id_table = ad7152_id,
 };
 module_i2c_driver(ad7152_driver);

drivers/staging/iio/cdc/ad7746.c

@@ -749,7 +749,7 @@ static int ad7746_probe(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
-	ret = iio_device_register(indio_dev);
+	ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
 	if (ret)
 		return ret;
 
@@ -758,15 +758,6 @@ static int ad7746_probe(struct i2c_client *client,
 	return 0;
 }
 
-static int ad7746_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
-	iio_device_unregister(indio_dev);
-
-	return 0;
-}
-
 static const struct i2c_device_id ad7746_id[] = {
 	{ "ad7745", 7745 },
 	{ "ad7746", 7746 },
@@ -781,7 +772,6 @@ static struct i2c_driver ad7746_driver = {
 		.name = KBUILD_MODNAME,
 	},
 	.probe = ad7746_probe,
-	.remove = ad7746_remove,
 	.id_table = ad7746_id,
 };
 module_i2c_driver(ad7746_driver);