linux-kernel - [PATCH] iio: accel: bma180: use iio helper function to guarantee direct mode

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Message-ID: <20160720042525.GA31927@d830.WORKGROUP>
Date:	Tue, 19 Jul 2016 21:25:37 -0700
From:	Alison Schofield <amsfield22@...il.com>
To:	jic23@...nel.org
Cc:	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iio: accel: bma180: 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.

Signed-off-by: Alison Schofield <amsfield22@...il.com>
Cc: Daniel Baluta <daniel.baluta@...il.com>
---
Peter: I was not clear if we want to keep the data->mutex lock
in addition to claiming direct mode.  I see that lock assuring
exclusivity amongst a few other tasks in the driver. Let me 
know if this needs both locks. Thanks!


 drivers/iio/accel/bma180.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
index e3f88ba..ce5a476 100644
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -469,13 +469,12 @@ static int bma180_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		mutex_lock(&data->mutex);
-		if (iio_buffer_enabled(indio_dev)) {
-			mutex_unlock(&data->mutex);
-			return -EBUSY;
-		}
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
 		ret = bma180_get_data_reg(data, chan->scan_index);
-		mutex_unlock(&data->mutex);
+		iio_device_release_direct_mode(indio_dev);
 		if (ret < 0)
 			return ret;
 		*val = sign_extend32(ret >> chan->scan_type.shift,
-- 
2.1.4