iio: trigger: Add filter callback
Allow devices to reject triggers and vice versa.
Changes since V1:
Added kernel-doc
Moved callback into iio_info
Changed function naming
Revised return value passing
Add forward declaration to avoid warnings
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/iio/industrialio-trigger.c b/drivers/staging/iio/industrialio-trigger.c
index d504aa2..90ca2df 100644
--- a/drivers/staging/iio/industrialio-trigger.c
+++ b/drivers/staging/iio/industrialio-trigger.c
@@ -340,6 +340,9 @@
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct iio_trigger *oldtrig = dev_info->trig;
+ struct iio_trigger *trig;
+ int ret;
+
mutex_lock(&dev_info->mlock);
if (dev_info->currentmode == INDIO_RING_TRIGGERED) {
mutex_unlock(&dev_info->mlock);
@@ -347,7 +350,22 @@
}
mutex_unlock(&dev_info->mlock);
- dev_info->trig = iio_trigger_find_by_name(buf, len);
+ trig = iio_trigger_find_by_name(buf, len);
+
+ if (trig && dev_info->info->validate_trigger) {
+ ret = dev_info->info->validate_trigger(dev_info, trig);
+ if (ret)
+ return ret;
+ }
+
+ if (trig && trig->validate_device) {
+ ret = trig->validate_device(trig, dev_info);
+ if (ret)
+ return ret;
+ }
+
+ dev_info->trig = trig;
+
if (oldtrig && dev_info->trig != oldtrig)
iio_put_trigger(oldtrig);
if (dev_info->trig)
