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iio: 104-quad-8: Fix active level mismatch for the preset enable option 

The set_to_preset_on_index sysfs attribute provides a boolean
configuration option to enable a preset operation on the respective
channel's counter when Index occurs. However, the corresponding
configuration bit on the Input/Output Control register must be set low
to enable the preset operation.

This patch inverts the internal driver boolean logic exposed via the
set_to_preset_on_index attribute in order to correctly configure the
device which expects an active low bit.

Fixes: 28e5d3bb03 ("iio: 104-quad-8: Add IIO support for the ACCES 104-QUAD-8")
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
William Breathitt Gray 2016-11-29 10:51:48 -05:00 committed by Jonathan Cameron
parent 7e1c4058e7
commit e91c3dfcd3
1 changed files with 4 additions and 1 deletions
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5
drivers/iio/counter/104-quad-8.c
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@ -233,7 +233,7 @@ static ssize_t quad8_read_set_to_preset_on_index(struct iio_dev *indio_dev,
const struct quad8_iio *const priv = iio_priv(indio_dev);
return snprintf(buf, PAGE_SIZE, "%u\n",
priv->preset_enable[chan->channel]);
!priv->preset_enable[chan->channel]);
}
static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,
@ -250,6 +250,9 @@ static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,
if (ret)
return ret;
/* Preset enable is active low in Input/Output Control register */
preset_enable = !preset_enable;
priv->preset_enable[chan->channel] = preset_enable;
ior_cfg = priv->ab_enable[chan->channel] |