staging:iio: add generic data ready poll function.

This case is extremely common, so let us only have the one
copy.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/industrialio-trigger.c

@@ -189,6 +189,13 @@ void iio_trigger_poll(struct iio_trigger *trig, s64 time)
 }
 EXPORT_SYMBOL(iio_trigger_poll);
 
+irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
+{
+	iio_trigger_poll(private, iio_get_time_ns());
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
+
 void iio_trigger_notify_done(struct iio_trigger *trig)
 {
 	trig->use_count--;

drivers/staging/iio/trigger.h

@@ -127,6 +127,8 @@ int iio_trigger_dettach_poll_func(struct iio_trigger *trig,
 void iio_trigger_poll(struct iio_trigger *trig, s64 time);
 void iio_trigger_notify_done(struct iio_trigger *trig);
 
+irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
+
 static inline int iio_trigger_get_irq(struct iio_trigger *trig)
 {
 	int ret;