staging:iio:imu:adis16400 add control of data filtering.

Bartlett filter used.  Values read of figures on datasheet
so far from precise.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/imu/adis16400.h b/drivers/staging/iio/imu/adis16400.h
index f3546ee910a28cfd82956a577629139c8aece697..83d133efaac6e303efe634dbb0b75fa88d93a87c 100644 (file)
--- a/drivers/staging/iio/imu/adis16400.h
+++ b/drivers/staging/iio/imu/adis16400.h
@@ -148,12 +148,14 @@ struct adis16400_chip_info {
  * @tx:                        transmit buffer
  * @rx:                        receive buffer
  * @buf_lock:          mutex to protect tx and rx
+ * @filt_int:          integer part of requested filter frequency
  **/
 struct adis16400_state {
        struct spi_device               *us;
        struct iio_trigger              *trig;
        struct mutex                    buf_lock;
        struct adis16400_chip_info      *variant;
+       int                             filt_int;
 
        u8      tx[ADIS16400_MAX_TX] ____cacheline_aligned;
        u8      rx[ADIS16400_MAX_RX] ____cacheline_aligned;

diff --git a/drivers/staging/iio/imu/adis16400_core.c b/drivers/staging/iio/imu/adis16400_core.c
index a6da69f64f2630b8093a8b5b77cd7d224f505e3b..de12f9acfd269d64d334913e6bba3a5f29cf8792 100644 (file)
--- a/drivers/staging/iio/imu/adis16400_core.c
+++ b/drivers/staging/iio/imu/adis16400_core.c
@@ -161,25 +161,65 @@ error_ret:
        return ret;
 }
 
+static int adis16400_get_freq(struct iio_dev *indio_dev)
+{
+       u16 t;
+       int sps, ret;
+
+       ret = adis16400_spi_read_reg_16(indio_dev, ADIS16400_SMPL_PRD, &t);
+       if (ret < 0)
+               return ret;
+       sps =  (t & ADIS16400_SMPL_PRD_TIME_BASE) ? 53 : 1638;
+       sps /= (t & ADIS16400_SMPL_PRD_DIV_MASK) + 1;
+
+       return sps;
+}
+
 static ssize_t adis16400_read_frequency(struct device *dev,
                struct device_attribute *attr,
                char *buf)
 {
        struct iio_dev *indio_dev = dev_get_drvdata(dev);
        int ret, len = 0;
-       u16 t;
-       int sps;
-       ret = adis16400_spi_read_reg_16(indio_dev,
-                       ADIS16400_SMPL_PRD,
-                       &t);
-       if (ret)
+       ret = adis16400_get_freq(indio_dev);
+       if (ret < 0)
                return ret;
-       sps =  (t & ADIS16400_SMPL_PRD_TIME_BASE) ? 53 : 1638;
-       sps /= (t & ADIS16400_SMPL_PRD_DIV_MASK) + 1;
-       len = sprintf(buf, "%d SPS\n", sps);
+       len = sprintf(buf, "%d SPS\n", ret);
        return len;
 }
 
+static const unsigned adis16400_3db_divisors[] = {
+       [0] = 2, /* Special case */
+       [1] = 5,
+       [2] = 10,
+       [3] = 50,
+       [4] = 200,
+};
+
+static int adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val)
+{
+       int i, ret;
+       u16 val16;
+       for (i = ARRAY_SIZE(adis16400_3db_divisors) - 1; i >= 0; i--)
+               if (sps/adis16400_3db_divisors[i] > val)
+                       break;
+       if (i == -1)
+               ret = -EINVAL;
+       else {
+               ret = adis16400_spi_read_reg_16(indio_dev,
+                                               ADIS16400_SENS_AVG,
+                                               &val16);
+               if (ret < 0)
+                       goto error_ret;
+
+               ret = adis16400_spi_write_reg_16(indio_dev,
+                                                ADIS16400_SENS_AVG,
+                                                (val16 & ~0x03) | i);
+       }
+error_ret:
+       return ret;
+}
+
 static ssize_t adis16400_write_frequency(struct device *dev,
                struct device_attribute *attr,
                const char *buf,
@@ -210,6 +250,7 @@ static ssize_t adis16400_write_frequency(struct device *dev,
                        ADIS16400_SMPL_PRD,
                        t);
 
+       /* Also update the filter */
        mutex_unlock(&indio_dev->mlock);
 
        return ret ? ret : len;
@@ -455,13 +496,15 @@ static u8 adis16400_addresses[17][2] = {
        [incli_y] = { ADIS16300_ROLL_OUT }
 };
 
+
 static int adis16400_write_raw(struct iio_dev *indio_dev,
                               struct iio_chan_spec const *chan,
                               int val,
                               int val2,
                               long mask)
 {
-       int ret;
+       struct adis16400_state *st = iio_priv(indio_dev);
+       int ret, sps;
 
        switch (mask) {
        case IIO_CHAN_INFO_CALIBBIAS:
@@ -471,6 +514,21 @@ static int adis16400_write_raw(struct iio_dev *indio_dev,
                                val);
                mutex_unlock(&indio_dev->mlock);
                return ret;
+       case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+               /* Need to cache values so we can update if the frequency
+                  changes */
+               mutex_lock(&indio_dev->mlock);
+               st->filt_int = val;
+               /* Work out update to current value */
+               sps = adis16400_get_freq(indio_dev);
+               if (sps < 0) {
+                       mutex_unlock(&indio_dev->mlock);
+                       return sps;
+               }
+
+               ret = adis16400_set_filter(indio_dev, sps, val);
+               mutex_unlock(&indio_dev->mlock);
+               return ret;
        default:
                return -EINVAL;
        }
@@ -548,6 +606,24 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
                *val = 198;
                *val2 = 160000;
                return IIO_VAL_INT_PLUS_MICRO;
+       case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+               mutex_lock(&indio_dev->mlock);
+               /* Need both the number of taps and the sampling frequency */
+               ret = adis16400_spi_read_reg_16(indio_dev,
+                                               ADIS16400_SENS_AVG,
+                                               &val16);
+               if (ret < 0) {
+                       mutex_unlock(&indio_dev->mlock);
+                       return ret;
+               }
+               ret = adis16400_get_freq(indio_dev);
+               if (ret > 0)
+                       *val = ret/adis16400_3db_divisors[val16 & 0x03];
+               *val2 = 0;
+               mutex_unlock(&indio_dev->mlock);
+               if (ret < 0)
+                       return ret;
+               return IIO_VAL_INT_PLUS_MICRO;
        default:
                return -EINVAL;
        }
@@ -568,7 +644,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_x,
                .scan_index = ADIS16400_SCAN_GYRO_X,
                .scan_type = IIO_ST('s', 14, 16, 0)
@@ -577,7 +654,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_y,
                .scan_index = ADIS16400_SCAN_GYRO_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -586,7 +664,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_z,
                .scan_index = ADIS16400_SCAN_GYRO_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -595,7 +674,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_x,
                .scan_index = ADIS16400_SCAN_ACC_X,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -604,7 +684,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_y,
                .scan_index = ADIS16400_SCAN_ACC_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -613,7 +694,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_z,
                .scan_index = ADIS16400_SCAN_ACC_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -621,7 +703,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .type = IIO_MAGN,
                .modified = 1,
                .channel2 = IIO_MOD_X,
-               .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = magn_x,
                .scan_index = ADIS16400_SCAN_MAGN_X,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -629,7 +712,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .type = IIO_MAGN,
                .modified = 1,
                .channel2 = IIO_MOD_Y,
-               .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = magn_y,
                .scan_index = ADIS16400_SCAN_MAGN_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -637,7 +721,8 @@ static struct iio_chan_spec adis16400_channels[] = {
                .type = IIO_MAGN,
                .modified = 1,
                .channel2 = IIO_MOD_Z,
-               .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = magn_z,
                .scan_index = ADIS16400_SCAN_MAGN_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -677,7 +762,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_x,
                .scan_index = ADIS16400_SCAN_GYRO_X,
                .scan_type = IIO_ST('s', 14, 16, 0)
@@ -686,7 +772,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_y,
                .scan_index = ADIS16400_SCAN_GYRO_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -695,7 +782,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_z,
                .scan_index = ADIS16400_SCAN_GYRO_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -704,7 +792,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_x,
                .scan_index = ADIS16400_SCAN_ACC_X,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -713,7 +802,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_y,
                .scan_index = ADIS16400_SCAN_ACC_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -722,7 +812,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_z,
                .scan_index = ADIS16400_SCAN_ACC_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -732,7 +823,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .channel = 0,
                .extend_name = "x",
                .info_mask = IIO_CHAN_INFO_OFFSET_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
+               IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = temp0,
                .scan_index = ADIS16350_SCAN_TEMP_X,
                .scan_type = IIO_ST('s', 12, 16, 0),
@@ -742,7 +834,8 @@ static struct iio_chan_spec adis16350_channels[] = {
                .channel = 1,
                .extend_name = "y",
                .info_mask = IIO_CHAN_INFO_OFFSET_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
+               IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = temp1,
                .scan_index = ADIS16350_SCAN_TEMP_Y,
                .scan_type = IIO_ST('s', 12, 16, 0),
@@ -783,7 +876,8 @@ static struct iio_chan_spec adis16300_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_x,
                .scan_index = ADIS16400_SCAN_GYRO_X,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -792,7 +886,8 @@ static struct iio_chan_spec adis16300_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_x,
                .scan_index = ADIS16400_SCAN_ACC_X,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -801,7 +896,8 @@ static struct iio_chan_spec adis16300_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_y,
                .scan_index = ADIS16400_SCAN_ACC_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -810,7 +906,8 @@ static struct iio_chan_spec adis16300_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_z,
                .scan_index = ADIS16400_SCAN_ACC_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -857,7 +954,8 @@ static const struct iio_chan_spec adis16334_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_x,
                .scan_index = ADIS16400_SCAN_GYRO_X,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -866,7 +964,8 @@ static const struct iio_chan_spec adis16334_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_y,
                .scan_index = ADIS16400_SCAN_GYRO_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -875,7 +974,8 @@ static const struct iio_chan_spec adis16334_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = gyro_z,
                .scan_index = ADIS16400_SCAN_GYRO_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -884,7 +984,8 @@ static const struct iio_chan_spec adis16334_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_x,
                .scan_index = ADIS16400_SCAN_ACC_X,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -893,7 +994,8 @@ static const struct iio_chan_spec adis16334_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_y,
                .scan_index = ADIS16400_SCAN_ACC_Y,
                .scan_type = IIO_ST('s', 14, 16, 0),
@@ -902,7 +1004,8 @@ static const struct iio_chan_spec adis16334_channels[] = {
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .info_mask = IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
-               IIO_CHAN_INFO_SCALE_SHARED_BIT,
+               IIO_CHAN_INFO_SCALE_SHARED_BIT |
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT,
                .address = accel_z,
                .scan_index = ADIS16400_SCAN_ACC_Z,
                .scan_type = IIO_ST('s', 14, 16, 0),