iio: adis16480: Fix scale factors

The different devices support by the adis16480 driver have slightly
different scales for the gyroscope and accelerometer channels.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 33 insertions, 6 deletions

diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
index 989605dd6f78..b94bfd3f595b 100644
--- a/drivers/iio/imu/adis16480.c
+++ b/drivers/iio/imu/adis16480.c
@@ -110,6 +110,10 @@
 struct adis16480_chip_info {
         unsigned int num_channels;
         const struct iio_chan_spec *channels;
+        unsigned int gyro_max_val;
+        unsigned int gyro_max_scale;
+        unsigned int accel_max_val;
+        unsigned int accel_max_scale;
 };
 
 struct adis16480 {
@@ -497,19 +501,21 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
 static int adis16480_read_raw(struct iio_dev *indio_dev,
         const struct iio_chan_spec *chan, int *val, int *val2, long info)
 {
+        struct adis16480 *st = iio_priv(indio_dev);
+
         switch (info) {
         case IIO_CHAN_INFO_RAW:
                 return adis_single_conversion(indio_dev, chan, 0, val);
         case IIO_CHAN_INFO_SCALE:
                 switch (chan->type) {
                 case IIO_ANGL_VEL:
-                        *val = 0;
-                        *val2 = IIO_DEGREE_TO_RAD(20000); /* 0.02 degree/sec */
-                        return IIO_VAL_INT_PLUS_MICRO;
+                        *val = st->chip_info->gyro_max_scale;
+                        *val2 = st->chip_info->gyro_max_val;
+                        return IIO_VAL_FRACTIONAL;
                 case IIO_ACCEL:
-                        *val = 0;
-                        *val2 = IIO_G_TO_M_S_2(800); /* 0.8 mg */
-                        return IIO_VAL_INT_PLUS_MICRO;
+                        *val = st->chip_info->accel_max_scale;
+                        *val2 = st->chip_info->accel_max_val;
+                        return IIO_VAL_FRACTIONAL;
                 case IIO_MAGN:
                         *val = 0;
                         *val2 = 100; /* 0.0001 gauss */
@@ -674,18 +680,39 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
         [ADIS16375] = {
                 .channels = adis16485_channels,
                 .num_channels = ARRAY_SIZE(adis16485_channels),
+                /*
+                 * storing the value in rad/degree and the scale in degree
+                 * gives us the result in rad and better precession than
+                 * storing the scale directly in rad.
+                 */
+                .gyro_max_val = IIO_RAD_TO_DEGREE(22887),
+                .gyro_max_scale = 300,
+                .accel_max_val = IIO_M_S_2_TO_G(21973),
+                .accel_max_scale = 18,
         },
         [ADIS16480] = {
                 .channels = adis16480_channels,
                 .num_channels = ARRAY_SIZE(adis16480_channels),
+                .gyro_max_val = IIO_RAD_TO_DEGREE(22500),
+                .gyro_max_scale = 450,
+                .accel_max_val = IIO_M_S_2_TO_G(12500),
+                .accel_max_scale = 5,
         },
         [ADIS16485] = {
                 .channels = adis16485_channels,
                 .num_channels = ARRAY_SIZE(adis16485_channels),
+                .gyro_max_val = IIO_RAD_TO_DEGREE(22500),
+                .gyro_max_scale = 450,
+                .accel_max_val = IIO_M_S_2_TO_G(20000),
+                .accel_max_scale = 5,
         },
         [ADIS16488] = {
                 .channels = adis16480_channels,
                 .num_channels = ARRAY_SIZE(adis16480_channels),
+                .gyro_max_val = IIO_RAD_TO_DEGREE(22500),
+                .gyro_max_scale = 450,
+                .accel_max_val = IIO_M_S_2_TO_G(22500),
+                .accel_max_scale = 18,
         },
 };