iio: gyro: bmg160: fix endianness when reading axes

commit 95e7ff034175db7d8aefabe7716c4d42bea24fde upstream.

For big endian platforms, reading the axes will return
invalid values.

The device stores each axis value in a 16 bit little
endian register. The driver uses regmap_read_bulk to get
the axis value, resulting in a 16 bit little endian value.
This needs to be converted to cpu endianness to work
on big endian platforms.

Fix endianness for big endian platforms by converting
the values for the axes read from little endian to
cpu.

This is also partially fixed in commit 82d8e5da1a33 ("iio:
accel: bmg160: optimize transfers in trigger handler").

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/gyro/bmg160_core.c b/drivers/iio/gyro/bmg160_core.c
index 479cf7b09afa289b24c4cd07afe9823daef092be..4dac567e75b4f00c61ea11d9c1dbc3b663e56a25 100644 (file)
--- a/drivers/iio/gyro/bmg160_core.c
+++ b/drivers/iio/gyro/bmg160_core.c
@@ -452,7 +452,7 @@ static int bmg160_get_temp(struct bmg160_data *data, int *val)
 static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
 {
        int ret;
-       unsigned int raw_val;
+       __le16 raw_val;
 
        mutex_lock(&data->mutex);
        ret = bmg160_set_power_state(data, true);
@@ -462,7 +462,7 @@ static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
        }
 
        ret = regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(axis), &raw_val,
-                              2);
+                              sizeof(raw_val));
        if (ret < 0) {
                dev_err(data->dev, "Error reading axis %d\n", axis);
                bmg160_set_power_state(data, false);
@@ -470,7 +470,7 @@ static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
                return ret;
        }
 
-       *val = sign_extend32(raw_val, 15);
+       *val = sign_extend32(le16_to_cpu(raw_val), 15);
        ret = bmg160_set_power_state(data, false);
        mutex_unlock(&data->mutex);
        if (ret < 0)
@@ -733,6 +733,7 @@ static const struct iio_event_spec bmg160_event = {
                .sign = 's',                                            \
                .realbits = 16,                                 \
                .storagebits = 16,                                      \
+               .endianness = IIO_LE,                                   \
        },                                                              \
        .event_spec = &bmg160_event,                                    \
        .num_event_specs = 1                                            \