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iio:adc:ad799x: Fix reading and writing of event values, apply shift

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last two bits of ADC and limit values are zero and should not be reported
(ad7993, ad7997); compare with read_raw()

event values are 10 (ad7993, ad7997) or 12 bit max., check the range on write

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Stable@vger.kernel.org
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald 2014-12-06 05:54:00 +00:00 committed by Jonathan Cameron
parent e28642c04a
commit 361d795002
1 changed files with 6 additions and 2 deletions
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8
drivers/iio/adc/ad799x.c
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@ -427,9 +427,12 @@ static int ad799x_write_event_value(struct iio_dev *indio_dev,
int ret;
struct ad799x_state *st = iio_priv(indio_dev);
if (val < 0 || val > RES_MASK(chan->scan_type.realbits))
return -EINVAL;
mutex_lock(&indio_dev->mlock);
ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
val);
val << chan->scan_type.shift);
mutex_unlock(&indio_dev->mlock);
return ret;
@ -452,7 +455,8 @@ static int ad799x_read_event_value(struct iio_dev *indio_dev,
mutex_unlock(&indio_dev->mlock);
if (ret < 0)
return ret;
*val = valin;
*val = (valin >> chan->scan_type.shift) &
RES_MASK(chan->scan_type.realbits);
return IIO_VAL_INT;
}