From 79de2ee469aaef0afb25dde7d65d7fbc91600573 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sat, 15 Oct 2016 15:55:06 +0100 Subject: [PATCH] iio: accel: mma8452: claim direct mode during write raw 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 Signed-off-by: Jonathan Cameron --- drivers/iio/accel/mma8452.c | 60 +++++++++++++++++++++++-------------- 1 file changed, 38 insertions(+), 22 deletions(-) diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c index 7951def89d63..f418c588af6a 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -666,37 +666,46 @@ 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; + break; + } 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); + break; case IIO_CHAN_INFO_SCALE: i = mma8452_get_scale_index(data, val, val2); - if (i < 0) - return i; + if (i < 0) { + ret = i; + break; + } 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); + break; case IIO_CHAN_INFO_CALIBBIAS: - if (val < -128 || val > 127) - return -EINVAL; + if (val < -128 || val > 127) { + ret = -EINVAL; + break; + } - return mma8452_change_config(data, - MMA8452_OFF_X + chan->scan_index, - val); + ret = mma8452_change_config(data, + MMA8452_OFF_X + chan->scan_index, + val); + break; case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY: if (val == 0 && val2 == 0) { @@ -705,23 +714,30 @@ 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; + break; } - return mma8452_change_config(data, MMA8452_DATA_CFG, + ret = mma8452_change_config(data, MMA8452_DATA_CFG, data->data_cfg); + break; 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); + break; + } } - + break; default: - return -EINVAL; + ret = -EINVAL; + break; } + + iio_device_release_direct_mode(indio_dev); + return ret; } static int mma8452_read_thresh(struct iio_dev *indio_dev,