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From:   Alexandru Ardelean <aardelean@deviqon.com>
To:     linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org
Cc:     jic23@kernel.org, Alexandru Ardelean <aardelean@deviqon.com>
Subject: [PATCH] iio: adc: max1363: convert probe to full device-managed
Date:   Sun, 26 Sep 2021 19:21:10 +0300
Message-Id: <20210926162110.3536436-1-aardelean@deviqon.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

For this conversion, the 2 regulators (being enabled) require each a
devm_add_action_or_reset() hook registration.

For the other functions, there are device-managed variants.

Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
---
 drivers/iio/adc/max1363.c | 82 ++++++++++++++-------------------------
 1 file changed, 30 insertions(+), 52 deletions(-)

diff --git a/drivers/iio/adc/max1363.c b/drivers/iio/adc/max1363.c
index f2b576c69949..eef55ed4814a 100644
--- a/drivers/iio/adc/max1363.c
+++ b/drivers/iio/adc/max1363.c
@@ -1577,6 +1577,11 @@ static const struct of_device_id max1363_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, max1363_of_match);
 
+static void max1363_reg_disable(void *reg)
+{
+	regulator_disable(reg);
+}
+
 static int max1363_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
@@ -1590,7 +1595,8 @@ static int max1363_probe(struct i2c_client *client,
 	if (!indio_dev)
 		return -ENOMEM;
 
-	ret = iio_map_array_register(indio_dev, client->dev.platform_data);
+	ret = devm_iio_map_array_register(&client->dev, indio_dev,
+					  client->dev.platform_data);
 	if (ret < 0)
 		return ret;
 
@@ -1598,17 +1604,16 @@ static int max1363_probe(struct i2c_client *client,
 
 	mutex_init(&st->lock);
 	st->reg = devm_regulator_get(&client->dev, "vcc");
-	if (IS_ERR(st->reg)) {
-		ret = PTR_ERR(st->reg);
-		goto error_unregister_map;
-	}
+	if (IS_ERR(st->reg))
+		return PTR_ERR(st->reg);
 
 	ret = regulator_enable(st->reg);
 	if (ret)
-		goto error_unregister_map;
+		return ret;
 
-	/* this is only used for device removal purposes */
-	i2c_set_clientdata(client, indio_dev);
+	ret = devm_add_action_or_reset(&client->dev, max1363_reg_disable, st->reg);
+	if (ret)
+		return ret;
 
 	st->chip_info = device_get_match_data(&client->dev);
 	if (!st->chip_info)
@@ -1622,13 +1627,17 @@ static int max1363_probe(struct i2c_client *client,
 
 		ret = regulator_enable(vref);
 		if (ret)
-			goto error_disable_reg;
+			return ret;
+
+		ret = devm_add_action_or_reset(&client->dev, max1363_reg_disable, vref);
+		if (ret)
+			return ret;
+
 		st->vref = vref;
 		vref_uv = regulator_get_voltage(vref);
-		if (vref_uv <= 0) {
-			ret = -EINVAL;
-			goto error_disable_reg;
-		}
+		if (vref_uv <= 0)
+			return -EINVAL;
+
 		st->vref_uv = vref_uv;
 	}
 
@@ -1640,13 +1649,12 @@ static int max1363_probe(struct i2c_client *client,
 		st->send = max1363_smbus_send;
 		st->recv = max1363_smbus_recv;
 	} else {
-		ret = -EOPNOTSUPP;
-		goto error_disable_reg;
+		return -EOPNOTSUPP;
 	}
 
 	ret = max1363_alloc_scan_masks(indio_dev);
 	if (ret)
-		goto error_disable_reg;
+		return ret;
 
 	indio_dev->name = id->name;
 	indio_dev->channels = st->chip_info->channels;
@@ -1655,12 +1663,12 @@ static int max1363_probe(struct i2c_client *client,
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	ret = max1363_initial_setup(st);
 	if (ret < 0)
-		goto error_disable_reg;
+		return ret;
 
-	ret = iio_triggered_buffer_setup(indio_dev, NULL,
-		&max1363_trigger_handler, NULL);
+	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
+					      &max1363_trigger_handler, NULL);
 	if (ret)
-		goto error_disable_reg;
+		return ret;
 
 	if (client->irq) {
 		ret = devm_request_threaded_irq(&client->dev, st->client->irq,
@@ -1671,39 +1679,10 @@ static int max1363_probe(struct i2c_client *client,
 					   indio_dev);
 
 		if (ret)
-			goto error_uninit_buffer;
+			return ret;
 	}
 
-	ret = iio_device_register(indio_dev);
-	if (ret < 0)
-		goto error_uninit_buffer;
-
-	return 0;
-
-error_uninit_buffer:
-	iio_triggered_buffer_cleanup(indio_dev);
-error_disable_reg:
-	if (st->vref)
-		regulator_disable(st->vref);
-	regulator_disable(st->reg);
-error_unregister_map:
-	iio_map_array_unregister(indio_dev);
-	return ret;
-}
-
-static int max1363_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-	struct max1363_state *st = iio_priv(indio_dev);
-
-	iio_device_unregister(indio_dev);
-	iio_triggered_buffer_cleanup(indio_dev);
-	if (st->vref)
-		regulator_disable(st->vref);
-	regulator_disable(st->reg);
-	iio_map_array_unregister(indio_dev);
-
-	return 0;
+	return devm_iio_device_register(&client->dev, indio_dev);
 }
 
 static const struct i2c_device_id max1363_id[] = {
@@ -1756,7 +1735,6 @@ static struct i2c_driver max1363_driver = {
 		.of_match_table = max1363_of_match,
 	},
 	.probe = max1363_probe,
-	.remove = max1363_remove,
 	.id_table = max1363_id,
 };
 module_i2c_driver(max1363_driver);
-- 
2.31.1