kevin/linux
1
Fork 0
Code

iio: kx022a: Fix acceleration value scaling

Browse Source 
The IIO ABI mandates acceleration values from accelerometer to be
emitted in m/s^2. The KX022A was emitting values in micro m/s^2.

Fix driver to report the correct scale values.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reported-by: Jagath Jog J <jagathjog1996@gmail.com>
Fixes: 7c1d1677b3 ("iio: accel: Support Kionix/ROHM KX022A accelerometer")
Tested-by: Jagath Jog J <jagathjog1996@gmail.com>
Link: https://lore.kernel.org/r/ZTEt7NqfDHPOkm8j@dc78bmyyyyyyyyyyyyydt-3.rev.dnainternet.fi
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Matti Vaittinen 2023-10-19 16:23:56 +03:00 committed by Jonathan Cameron
parent b85ea95d08
commit 92bfa4ab1b
1 changed files with 26 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/iio/accel/kionix-kx022a.c
View File

@ -393,17 +393,17 @@ static const unsigned int kx022a_odrs[] = {
* (range / 2^bits) * g = (range / 2^bits) * 9.80665 m/s^2
* => KX022A uses 16 bit (HiRes mode - assume the low 8 bits are zeroed
* in low-power mode(?) )
* => +/-2G => 4 / 2^16 * 9,80665 * 10^6 (to scale to micro)
* => +/-2G - 598.550415
* +/-4G - 1197.10083
* +/-8G - 2394.20166
* +/-16G - 4788.40332
* => +/-2G => 4 / 2^16 * 9,80665
* => +/-2G - 0.000598550415
* +/-4G - 0.00119710083
* +/-8G - 0.00239420166
* +/-16G - 0.00478840332
*/
static const int kx022a_scale_table[][2] = {
{ 598, 550415 },
{ 1197, 100830 },
{ 2394, 201660 },
{ 4788, 403320 },
{ 0, 598550 },
{ 0, 1197101 },
{ 0, 2394202 },
{ 0, 4788403 },
};
static int kx022a_read_avail(struct iio_dev *indio_dev,
@ -422,7 +422,7 @@ static int kx022a_read_avail(struct iio_dev *indio_dev,
*vals = (const int *)kx022a_scale_table;
*length = ARRAY_SIZE(kx022a_scale_table) *
ARRAY_SIZE(kx022a_scale_table[0]);
*type = IIO_VAL_INT_PLUS_MICRO;
*type = IIO_VAL_INT_PLUS_NANO;
return IIO_AVAIL_LIST;
default:
return -EINVAL;
@ -485,6 +485,20 @@ static int kx022a_turn_on_unlock(struct kx022a_data *data)
return ret;
}
static int kx022a_write_raw_get_fmt(struct iio_dev *idev,
struct iio_chan_spec const *chan,
long mask)
{
switch (mask) {
case IIO_CHAN_INFO_SCALE:
return IIO_VAL_INT_PLUS_NANO;
case IIO_CHAN_INFO_SAMP_FREQ:
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
}
static int kx022a_write_raw(struct iio_dev *idev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
@ -629,7 +643,7 @@ static int kx022a_read_raw(struct iio_dev *idev,
kx022a_reg2scale(regval, val, val2);
return IIO_VAL_INT_PLUS_MICRO;
return IIO_VAL_INT_PLUS_NANO;
}
return -EINVAL;
@ -856,6 +870,7 @@ static int kx022a_fifo_flush(struct iio_dev *idev, unsigned int samples)
static const struct iio_info kx022a_info = {
.read_raw = &kx022a_read_raw,
.write_raw = &kx022a_write_raw,
.write_raw_get_fmt = &kx022a_write_raw_get_fmt,
.read_avail = &kx022a_read_avail,
.validate_trigger = iio_validate_own_trigger,