[PATCH 3/3] iio: sx9310: Enable regulator for svdd supply

[Stephen Boyd <swboyd@chromium.org>]

Enable the digital IO power supply (svdd) during probe so that the i2c
communication works properly on boards that aggressively power gate this
supply.

Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Daniel Campello <campello@chromium.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/iio/proximity/sx9310.c | 49 ++++++++++++++++++++++++++++------
 1 file changed, 41 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 84c3c9ae80dc..d21c17a4d541 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -19,6 +19,7 @@
 #include <linux/of.h>
 #include <linux/pm.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 
 #include <linux/iio/buffer.h>
@@ -131,6 +132,7 @@ struct sx9310_data {
 	struct i2c_client *client;
 	struct iio_trigger *trig;
 	struct regmap *regmap;
+	struct regulator *supply;
 	/*
 	 * Last reading of the proximity status for each channel.
 	 * We only send an event to user space when this changes.
@@ -914,21 +916,31 @@ static int sx9310_probe(struct i2c_client *client,
 	mutex_init(&data->mutex);
 	init_completion(&data->completion);
 
+	data->supply = devm_regulator_get(&client->dev, "svdd");
+	if (IS_ERR(data->supply))
+		return PTR_ERR(data->supply);
+
 	data->regmap = devm_regmap_init_i2c(client, &sx9310_regmap_config);
 	if (IS_ERR(data->regmap))
 		return PTR_ERR(data->regmap);
 
+	ret = regulator_enable(data->supply);
+	if (ret)
+		return ret;
+	/* Must wait for Tpor time after initial power up */
+	usleep_range(1000, 1100);
+
 	ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami);
 	if (ret < 0) {
 		dev_err(&client->dev, "error in reading WHOAMI register: %d\n",
 			ret);
-		return ret;
+		goto err;
 	}
 
 	ret = sx9310_set_indio_dev_name(&client->dev, indio_dev, id,
 					data->whoami);
 	if (ret < 0)
-		return ret;
+		goto err;
 
 	ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(&client->dev));
 	indio_dev->dev.parent = &client->dev;
@@ -940,7 +952,7 @@ static int sx9310_probe(struct i2c_client *client,
 
 	ret = sx9310_init_device(indio_dev);
 	if (ret < 0)
-		return ret;
+		goto err;
 
 	if (client->irq) {
 		ret = devm_request_threaded_irq(&client->dev, client->irq,
@@ -949,13 +961,15 @@ static int sx9310_probe(struct i2c_client *client,
 						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 						"sx9310_event", indio_dev);
 		if (ret < 0)
-			return ret;
+			goto err;
 
 		data->trig =
 			devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
 					       indio_dev->name, indio_dev->id);
-		if (!data->trig)
-			return -ENOMEM;
+		if (!data->trig) {
+			ret = -ENOMEM;
+			goto err;
+		}
 
 		data->trig->dev.parent = &client->dev;
 		data->trig->ops = &sx9310_trigger_ops;
@@ -963,7 +977,7 @@ static int sx9310_probe(struct i2c_client *client,
 
 		ret = devm_iio_trigger_register(&client->dev, data->trig);
 		if (ret)
-			return ret;
+			goto err;
 	}
 
 	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
@@ -971,9 +985,27 @@ static int sx9310_probe(struct i2c_client *client,
 					      sx9310_trigger_handler,
 					      &sx9310_buffer_setup_ops);
 	if (ret < 0)
-		return ret;
+		goto err;
 
 	return devm_iio_device_register(&client->dev, indio_dev);
+err:
+	regulator_disable(data->supply);
+	return ret;
+}
+
+static int sx9310_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev;
+	struct sx9310_data *data;
+
+	indio_dev = i2c_get_clientdata(client);
+	if (!indio_dev)
+		return -ENODEV;
+
+	data = iio_priv(indio_dev);
+	regulator_disable(data->supply);
+
+	return 0;
 }
 
 static int __maybe_unused sx9310_suspend(struct device *dev)
@@ -1059,6 +1091,7 @@ static struct i2c_driver sx9310_driver = {
 		.pm = &sx9310_pm_ops,
 	},
 	.probe		= sx9310_probe,
+	.remove		= sx9310_remove,
 	.id_table	= sx9310_id,
 };
 module_i2c_driver(sx9310_driver);
-- 
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