iio:bma180: Prepare for accelerometer channels with different resolutions

allow to specify channels resolution and compute shift assuming
16-bit registers and MSB allocation

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Oleksandr Kravchenko <o.v.kravchenko@globallogic.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
index 933645547f82..f4d280456dd7 100644
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -476,7 +476,7 @@ static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
         { },
 };
 
-#define BMA180_ACC_CHANNEL(_axis) {                                     \
+#define BMA180_ACC_CHANNEL(_axis, _bits) {                              \
         .type = IIO_ACCEL,                                              \
         .modified = 1,                                                  \
         .channel2 = IIO_MOD_##_axis,                                    \
@@ -486,9 +486,9 @@ static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
         .scan_index = AXIS_##_axis,                                     \
         .scan_type = {                                                  \
                 .sign = 's',                                            \
-                .realbits = 14,                                         \
+                .realbits = _bits,                                      \
                 .storagebits = 16,                                      \
-                .shift = 2,                                             \
+                .shift = 16 - _bits,                                    \
         },                                                              \
         .ext_info = bma180_ext_info,                                    \
 }
@@ -506,9 +506,9 @@ static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
 }
 
 static const struct iio_chan_spec bma180_channels[] = {
-        BMA180_ACC_CHANNEL(X),
-        BMA180_ACC_CHANNEL(Y),
-        BMA180_ACC_CHANNEL(Z),
+        BMA180_ACC_CHANNEL(X, 14),
+        BMA180_ACC_CHANNEL(Y, 14),
+        BMA180_ACC_CHANNEL(Z, 14),
         BMA180_TEMP_CHANNEL,
         IIO_CHAN_SOFT_TIMESTAMP(4),
 };