linux-kernel - [PATCH] iio: magnetometer: mag3110: claim direct mode during raw reads

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Message-ID: <20160801154827.GA7017@d830.WORKGROUP>
Date:	Mon, 1 Aug 2016 08:48:37 -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: magnetometer: mag3110: claim direct mode during raw
 reads

Driver was checking for direct mode but not locking it.  Use
claim/release helper functions to guarantee the device stays
in direct mode during raw reads.

Signed-off-by: Alison Schofield <amsfield22@...il.com>
Cc: Daniel Baluta <daniel.baluta@...il.com>
---
 drivers/iio/magnetometer/mag3110.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/magnetometer/mag3110.c b/drivers/iio/magnetometer/mag3110.c
index f2be4a0..90574ff 100644
--- a/drivers/iio/magnetometer/mag3110.c
+++ b/drivers/iio/magnetometer/mag3110.c
@@ -154,34 +154,39 @@ static int mag3110_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		if (iio_buffer_enabled(indio_dev))
-			return -EBUSY;
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
 
 		switch (chan->type) {
 		case IIO_MAGN: /* in 0.1 uT / LSB */
 			ret = mag3110_read(data, buffer);
 			if (ret < 0)
-				return ret;
+				goto release;
 			*val = sign_extend32(
 				be16_to_cpu(buffer[chan->scan_index]), 15);
-			return IIO_VAL_INT;
+			ret = IIO_VAL_INT;
 		case IIO_TEMP: /* in 1 C / LSB */
 			mutex_lock(&data->lock);
 			ret = mag3110_request(data);
 			if (ret < 0) {
 				mutex_unlock(&data->lock);
-				return ret;
+				goto release;
 			}
 			ret = i2c_smbus_read_byte_data(data->client,
 				MAG3110_DIE_TEMP);
 			mutex_unlock(&data->lock);
 			if (ret < 0)
-				return ret;
+				goto release;
 			*val = sign_extend32(ret, 7);
-			return IIO_VAL_INT;
+			ret = IIO_VAL_INT;
 		default:
-			return -EINVAL;
+			ret = -EINVAL;
 		}
+release:
+		iio_device_release_direct_mode(indio_dev);
+		return ret;
+
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->type) {
 		case IIO_MAGN:
-- 
2.1.4