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iio:adc:ad799x: Allow writing of event config

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Allows explicity enabling of events

Previously, events were always reported as enabled, but actually only
implicitly enabled when updating the buffer scan mode

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
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 1d15330a39
commit 3008d082f2
1 changed files with 34 additions and 0 deletions
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34
drivers/iio/adc/ad799x.c
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@ -375,6 +375,39 @@ static int ad799x_read_event_config(struct iio_dev *indio_dev,
return 0;
}
static int ad799x_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int state)
{
struct ad799x_state *st = iio_priv(indio_dev);
int ret;
mutex_lock(&indio_dev->mlock);
if (iio_buffer_enabled(indio_dev)) {
ret = -EBUSY;
goto done;
}
if (state)
st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
else
st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
if (st->config >> AD799X_CHANNEL_SHIFT)
st->config |= AD7998_ALERT_EN;
else
st->config &= ~AD7998_ALERT_EN;
ret = ad799x_write_config(st, st->config);
done:
mutex_unlock(&indio_dev->mlock);
return ret;
}
static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
enum iio_event_direction dir,
enum iio_event_info info)
@ -502,6 +535,7 @@ static const struct iio_info ad7993_4_7_8_irq_info = {
.read_raw = &ad799x_read_raw,
.event_attrs = &ad799x_event_attrs_group,
.read_event_config = &ad799x_read_event_config,
.write_event_config = &ad799x_write_event_config,
.read_event_value = &ad799x_read_event_value,
.write_event_value = &ad799x_write_event_value,
.driver_module = THIS_MODULE,