[PATCH] iio: accel: mma8452: claim direct mode during write raw

Alison Schofield
2016-10-11T20:36:10Z

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

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
---
drivers/iio/accel/mma8452.c | 53 +++++++++++++++++++++++++++------------------
1 file changed, 32 insertions(+), 21 deletions(-)

diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index 7951def..cbbc746 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -666,37 +666,43 @@ static int mma8452_write_raw(struct iio_dev *indio_dev,
struct mma8452_data *data = iio_priv(indio_dev);
int i, ret;

- if (iio_buffer_enabled(indio_dev))
- return -EBUSY;
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;

switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
i = mma8452_get_samp_freq_index(data, val, val2);
- if (i < 0)
- return i;
-
+ if (i < 0) {
+ ret = i;
+ goto release;
+ }
data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;

- return mma8452_change_config(data, MMA8452_CTRL_REG1,
- data->ctrl_reg1);
+ ret = mma8452_change_config(data, MMA8452_CTRL_REG1,
+ data->ctrl_reg1);
case IIO_CHAN_INFO_SCALE:
i = mma8452_get_scale_index(data, val, val2);
- if (i < 0)
- return i;
+ if (i < 0) {
+ ret = i;
+ goto release;
+ }

data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK;
data->data_cfg |= i;

- return mma8452_change_config(data, MMA8452_DATA_CFG,
- data->data_cfg);
+ ret = mma8452_change_config(data, MMA8452_DATA_CFG,
+ data->data_cfg);
case IIO_CHAN_INFO_CALIBBIAS:
- if (val < -128 || val > 127)
- return -EINVAL;
+ if (val < -128 || val > 127) {
+ ret = -EINVAL;
+ goto release;
+ }

- return mma8452_change_config(data,
- MMA8452_OFF_X + chan->scan_index,
- val);
+ ret = mma8452_change_config(data,
+ MMA8452_OFF_X + chan->scan_index,
+ val);

case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
if (val == 0 && val2 == 0) {
@@ -705,23 +711,28 @@ static int mma8452_write_raw(struct iio_dev *indio_dev,
data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK;
ret = mma8452_set_hp_filter_frequency(data, val, val2);
if (ret < 0)
- return ret;
+ goto release;
}

- return mma8452_change_config(data, MMA8452_DATA_CFG,
+ ret = mma8452_change_config(data, MMA8452_DATA_CFG,
data->data_cfg);

case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
ret = mma8452_get_odr_index(data);

for (i = 0; i < ARRAY_SIZE(mma8452_os_ratio); i++) {
- if (mma8452_os_ratio[i][ret] == val)
- return mma8452_set_power_mode(data, i);
+ if (mma8452_os_ratio[i][ret] == val) {
+ ret = mma8452_set_power_mode(data, i);
+ goto release;
+ }
}

default:
- return -EINVAL;
+ ret = -EINVAL;
}
+release:
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
}

static int mma8452_read_thresh(struct iio_dev *indio_dev,
--
2.1.4