linux-kernel - [PATCH] iio: light: tcs3414: use iio helper function to guarantee direct mode

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Message-ID: <20160607050913.GA26916@d830.WORKGROUP>
Date:	Mon, 6 Jun 2016 22:09:21 -0700
From:	Alison Schofield <amsfield22@...il.com>
To:	jic23@...nel.org
Cc:	pmeerw@...erw.net, knaack.h@....de, lars@...afoo.de,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iio: light: tcs3414: use iio helper function to guarantee
 direct mode

Replace the code that guarantees the device stays in direct mode
with iio_device_claim_direct_mode() which does same.  This allows
removal of an unused lock in the device private global data.

Signed-off-by: Alison Schofield <amsfield22@...il.com>
Cc: Daniel Baluta <daniel.baluta@...il.com>
---
 drivers/iio/light/tcs3414.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/light/tcs3414.c b/drivers/iio/light/tcs3414.c
index f90f8c5..8a15fb5 100644
--- a/drivers/iio/light/tcs3414.c
+++ b/drivers/iio/light/tcs3414.c
@@ -53,7 +53,6 @@
 
 struct tcs3414_data {
 	struct i2c_client *client;
-	struct mutex lock;
 	u8 control;
 	u8 gain;
 	u8 timing;
@@ -134,16 +133,16 @@ static int tcs3414_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		if (iio_buffer_enabled(indio_dev))
-			return -EBUSY;
-		mutex_lock(&data->lock);
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
 		ret = tcs3414_req_data(data);
 		if (ret < 0) {
-			mutex_unlock(&data->lock);
+			iio_device_release_direct_mode(indio_dev);
 			return ret;
 		}
 		ret = i2c_smbus_read_word_data(data->client, chan->address);
-		mutex_unlock(&data->lock);
+		iio_device_release_direct_mode(indio_dev);
 		if (ret < 0)
 			return ret;
 		*val = ret;
@@ -288,7 +287,6 @@ static int tcs3414_probe(struct i2c_client *client,
 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;
-	mutex_init(&data->lock);
 
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->info = &tcs3414_info;
-- 
2.1.4