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staging:iio:ad7606: fix voltage scales

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[ Upstream commit 4ee033301c ]

Fixes commit 17be2a2905 ("staging: iio:
ad7606: replace range/range_available with corresponding scale").

The AD7606 devices don't have a 2.5V voltage range, they have 5V & 10V
voltage range, which is selectable via the `gpio_range` descriptor.

The scales also seem to have been miscomputed, because when they were
applied to the raw values, the results differ from the expected values.
After checking the ADC transfer function in the datasheet, these were
re-computed.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandru Ardelean 2018-09-13 11:44:09 +03:00 committed by Greg Kroah-Hartman
parent 38672b5741
commit 73ad886896
1 changed files with 5 additions and 2 deletions
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7
drivers/staging/iio/adc/ad7606.c
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@ -26,9 +26,12 @@
#include "ad7606.h"
/* Scales are computed as 2.5/2**16 and 5/2**16 respectively */
/*
* Scales are computed as 5000/32768 and 10000/32768 respectively,
* so that when applied to the raw values they provide mV values
*/
static const unsigned int scale_avail[2][2] = {
{0, 38147}, {0, 76294}
{0, 152588}, {0, 305176}
};
static int ad7606_reset(struct ad7606_state *st)