iio: light: tsl2563: pass iio device as i2c_client private data

We may want to get rid of the iio_priv_to_dev() helper. That's a bit
uncertain at this point. The reason is that we will hide some of the
members of the iio_dev structure (to prevent drivers from accessing them
directly), and that will also mean hiding the implementation of the
iio_priv_to_dev() helper inside the IIO core.

Hiding the implementation of iio_priv_to_dev() implies that some fast-paths
may not be fast anymore, so a general idea is to try to get rid of the
iio_priv_to_dev() altogether.

For this driver, it implies passing the IIO device on the i2c client
private data. The implementation of iio_priv() will not be affected by the
rework/hiding of iio_priv_to_dev().
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/light/tsl2563.c

@@ -713,7 +713,7 @@ static int tsl2563_probe(struct i2c_client *client,
 
 	chip = iio_priv(indio_dev);
 
-	i2c_set_clientdata(client, chip);
+	i2c_set_clientdata(client, indio_dev);
 	chip->client = client;
 
 	err = tsl2563_detect(chip);
@@ -797,8 +797,8 @@ static int tsl2563_probe(struct i2c_client *client,
 
 static int tsl2563_remove(struct i2c_client *client)
 {
-	struct tsl2563_chip *chip = i2c_get_clientdata(client);
-	struct iio_dev *indio_dev = iio_priv_to_dev(chip);
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct tsl2563_chip *chip = iio_priv(indio_dev);
 
 	iio_device_unregister(indio_dev);
 	if (!chip->int_enabled)
@@ -816,7 +816,8 @@ static int tsl2563_remove(struct i2c_client *client)
 #ifdef CONFIG_PM_SLEEP
 static int tsl2563_suspend(struct device *dev)
 {
-	struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct tsl2563_chip *chip = iio_priv(indio_dev);
 	int ret;
 
 	mutex_lock(&chip->lock);
@@ -834,7 +835,8 @@ static int tsl2563_suspend(struct device *dev)
 
 static int tsl2563_resume(struct device *dev)
 {
-	struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct tsl2563_chip *chip = iio_priv(indio_dev);
 	int ret;
 
 	mutex_lock(&chip->lock);