iio: core: Introduce IIO_EV_DIR_NONE

For some events (e.g.: step detector) a direction does not make sense.

Add IIO_EV_DIR_NONE to be used with such events and generate sysfs event
attributes that do not contain direction.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index 0c1e37e3120a..1290290adcb5 100644
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -327,9 +327,15 @@ static int iio_device_add_event(struct iio_dev *indio_dev,
         for_each_set_bit(i, mask, sizeof(*mask)*8) {
                 if (i >= ARRAY_SIZE(iio_ev_info_text))
                         return -EINVAL;
-                postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
-                                iio_ev_type_text[type], iio_ev_dir_text[dir],
-                                iio_ev_info_text[i]);
+                if (dir != IIO_EV_DIR_NONE)
+                        postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
+                                        iio_ev_type_text[type],
+                                        iio_ev_dir_text[dir],
+                                        iio_ev_info_text[i]);
+                else
+                        postfix = kasprintf(GFP_KERNEL, "%s_%s",
+                                        iio_ev_type_text[type],
+                                        iio_ev_info_text[i]);
                 if (postfix == NULL)
                         return -ENOMEM;