iio: adc: ad7291: convert probe to device-managed only

This is a simple conversion for to device-managed with using
devm_request_threaded_irq(), disabling the regulator via a
devm_add_action_or_reset() hook and finally using
devm_iio_device_register().

The i2c_set_clientdata() call is removed as it becomes redundant after this
change.
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210926194315.7742-1-aardelean@deviqon.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ad7291.c

@@ -460,6 +460,11 @@ static const struct iio_info ad7291_info = {
 	.write_event_value = &ad7291_write_event_value,
 };
 
+static void ad7291_reg_disable(void *reg)
+{
+	regulator_disable(reg);
+}
+
 static int ad7291_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
@@ -473,8 +478,6 @@ static int ad7291_probe(struct i2c_client *client,
 	chip = iio_priv(indio_dev);
 
 	mutex_init(&chip->state_lock);
-	/* this is only used for device removal purposes */
-	i2c_set_clientdata(client, indio_dev);
 
 	chip->client = client;
 
@@ -495,6 +498,11 @@ static int ad7291_probe(struct i2c_client *client,
 		if (ret)
 			return ret;
 
+		ret = devm_add_action_or_reset(&client->dev, ad7291_reg_disable,
+					       chip->reg);
+		if (ret)
+			return ret;
+
 		chip->command |= AD7291_EXT_REF;
 	}
 
@@ -506,58 +514,25 @@ static int ad7291_probe(struct i2c_client *client,
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
 	ret = ad7291_i2c_write(chip, AD7291_COMMAND, AD7291_RESET);
-	if (ret) {
-		ret = -EIO;
-		goto error_disable_reg;
-	}
+	if (ret)
+		return -EIO;
 
 	ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command);
-	if (ret) {
-		ret = -EIO;
-		goto error_disable_reg;
-	}
+	if (ret)
+		return -EIO;
 
 	if (client->irq > 0) {
-		ret = request_threaded_irq(client->irq,
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
 						NULL,
 						&ad7291_event_handler,
 						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 						id->name,
 						indio_dev);
 		if (ret)
-			goto error_disable_reg;
-	}
-
-	ret = iio_device_register(indio_dev);
-	if (ret)
-		goto error_unreg_irq;
-
-	return 0;
-
-error_unreg_irq:
-	if (client->irq)
-		free_irq(client->irq, indio_dev);
-error_disable_reg:
-	if (chip->reg)
-		regulator_disable(chip->reg);
-
 			return ret;
-}
-
-static int ad7291_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-
-	iio_device_unregister(indio_dev);
-
-	if (client->irq)
-		free_irq(client->irq, indio_dev);
-
-	if (chip->reg)
-		regulator_disable(chip->reg);
+	}
 
-	return 0;
+	return devm_iio_device_register(&client->dev, indio_dev);
 }
 
 static const struct i2c_device_id ad7291_id[] = {
@@ -579,7 +554,6 @@ static struct i2c_driver ad7291_driver = {
 		.of_match_table = ad7291_of_match,
 	},
 	.probe = ad7291_probe,
-	.remove = ad7291_remove,
 	.id_table = ad7291_id,
 };
 module_i2c_driver(ad7291_driver);