On 05/07/15 13:50, Jonathan Cameron wrote:
On 04/07/15 14:55, Martin Kepplinger wrote:IIO_EV_TYPE_THRESH in rising direction describes an event where the threshold is crossed in rising direction, positive or negative values being possible. This is not the case here. Since the threshold is no signed value and only the magnitude is compared, IIO_EV_TYPE_MAG is what describes the behaviour of these devices, see the sysfs-bus-iio ABI Documentation.
Fwiw there was some discussion of this before the initial submission: http://www.spinics.net/lists/linux-iio/msg14039.htmlInitially I used a magnitude too but Jonathan convinced me it should be a threshold.
" The moment you know the sign of the magnitude it stops being a magnitude and becomes a generic threshold. Report it as such and control it as such. "Thing is that the hardware indeed only compares the absolute value for the threshold *but* indicates with the event the sign. However it is true that the driver doesn't currently do anything with the sign information.
Signed-off-by: Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Christoph Muellner <christoph.muellner@xxxxxxxxxxxxxxxxxxxxx>This is a fix and so should have been the first patch in the series. It will want to go via a different tree (iio-fixes) and probably be marked for stable. I would however like Peter's ack on this as well before taking it.--- drivers/iio/accel/mma8452.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c index 7f6e3b4..e23ebd0 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -598,21 +598,21 @@ static void mma8452_transient_interrupt(struct iio_dev *indio_dev) if (src & data->chip_info->ev_src_xe) iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X, - IIO_EV_TYPE_THRESH, + IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING), ts);if (src & data->chip_info->ev_src_ye)iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y, - IIO_EV_TYPE_THRESH, + IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING), ts);if (src & data->chip_info->ev_src_ze)iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z, - IIO_EV_TYPE_THRESH, + IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING), ts); } @@ -689,7 +689,7 @@ static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,static const struct iio_event_spec mma8452_transient_event[] = {{ - .type = IIO_EV_TYPE_THRESH, + .type = IIO_EV_TYPE_MAG, .dir = IIO_EV_DIR_RISING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | @@ -700,7 +700,7 @@ static const struct iio_event_spec mma8452_transient_event[] = {static const struct iio_event_spec mma8452_motion_event[] = {{ - .type = IIO_EV_TYPE_THRESH, + .type = IIO_EV_TYPE_MAG, .dir = IIO_EV_DIR_RISING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
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