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iio: magnetometer: yas530: Correct scaling of magnetic axes

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Looks like YAS530 raw values return picotesla and YAS532 nanotesla. Adapt
comments and scaling.

Signed-off-by: Jakob Hauser <jahau@rocketmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/053ab05cb9a0f6b0536ab5e0de57009f513c6f81.1660337264.git.jahau@rocketmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jakob Hauser 2022-08-12 23:54:08 +02:00 committed by Jonathan Cameron
parent 4efdfbc16c
commit 413cf69163
1 changed files with 21 additions and 10 deletions
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31
drivers/iio/magnetometer/yamaha-yas530.c
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@ -310,8 +310,6 @@ static s32 yas5xx_linearize(struct yas5xx *yas5xx, u16 val, int axis)
* @yo: Y axis out
* @zo: Z axis out
* @return: 0 on success or error code
*
* Returned values are in nanotesla according to some code.
*/
static int yas5xx_get_measure(struct yas5xx *yas5xx, s32 *to, s32 *xo, s32 *yo, s32 *zo)
{
@ -417,14 +415,27 @@ static int yas5xx_read_raw(struct iio_dev *indio_dev,
*val = 1;
return IIO_VAL_INT;
}
/*
* The axis values are in nanotesla according to the vendor
* drivers, but is clearly in microtesla according to
* experiments. Since 1 uT = 0.01 Gauss, we need to divide
* by 100000000 (10^8) to get to Gauss from the raw value.
*/
*val = 1;
*val2 = 100000000;
switch (yas5xx->devid) {
case YAS530_DEVICE_ID:
/*
* Raw values of YAS530 are in picotesla. Divide by
* 100000000 (10^8) to get Gauss.
*/
*val = 1;
*val2 = 100000000;
break;
case YAS532_DEVICE_ID:
/*
* Raw values of YAS532 are in nanotesla. Divide by
* 100000 (10^5) to get Gauss.
*/
*val = 1;
*val2 = 100000;
break;
default:
dev_err(yas5xx->dev, "unknown device type\n");
return -EINVAL;
}
return IIO_VAL_FRACTIONAL;
default:
/* Unknown request */