linux-kernel - [PATCH] iio: light: tsl2563: pass iio device as i2c

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Date:   Fri, 22 May 2020 10:08:01 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>, <amit.kucheria@...durent.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH] 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@...log.com>
---
 drivers/iio/light/tsl2563.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/light/tsl2563.c b/drivers/iio/light/tsl2563.c
index 27a5c28aac7f..2987a7a79a97 100644
--- a/drivers/iio/light/tsl2563.c
+++ b/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);
-- 
2.25.1