iio: pressure: mpl3115: 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@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/pressure/mpl3115.c b/drivers/iio/pressure/mpl3115.c
index 6392d7b..cc3f841 100644 (file)
--- a/drivers/iio/pressure/mpl3115.c
+++ b/drivers/iio/pressure/mpl3115.c
@@ -82,8 +82,9 @@ static int mpl3115_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_PRESSURE: /* in 0.25 pascal / LSB */
@@ -91,32 +92,39 @@ static int mpl3115_read_raw(struct iio_dev *indio_dev,
                        ret = mpl3115_request(data);
                        if (ret < 0) {
                                mutex_unlock(&data->lock);
-                               return ret;
+                               break;
                        }
                        ret = i2c_smbus_read_i2c_block_data(data->client,
                                MPL3115_OUT_PRESS, 3, (u8 *) &tmp);
                        mutex_unlock(&data->lock);
                        if (ret < 0)
-                               return ret;
+                               break;
                        *val = be32_to_cpu(tmp) >> 12;
-                       return IIO_VAL_INT;
+                       ret = IIO_VAL_INT;
+                       break;
                case IIO_TEMP: /* in 0.0625 celsius / LSB */
                        mutex_lock(&data->lock);
                        ret = mpl3115_request(data);
                        if (ret < 0) {
                                mutex_unlock(&data->lock);
-                               return ret;
+                               break;
                        }
                        ret = i2c_smbus_read_i2c_block_data(data->client,
                                MPL3115_OUT_TEMP, 2, (u8 *) &tmp);
                        mutex_unlock(&data->lock);
                        if (ret < 0)
-                               return ret;
+                               break;
                        *val = sign_extend32(be32_to_cpu(tmp) >> 20, 11);
-                       return IIO_VAL_INT;
+                       ret = IIO_VAL_INT;
+                       break;
                default:
-                       return -EINVAL;
+                       ret = -EINVAL;
+                       break;
                }
+
+               iio_device_release_direct_mode(indio_dev);
+               return ret;
+
        case IIO_CHAN_INFO_SCALE:
                switch (chan->type) {
                case IIO_PRESSURE: