iio:triggers Protect functions in triggers.h from use when not compiled

Also include a couple of forward defs of struct iio_trigger and struct
iio_trigger_ops to avoid doing this in each driver.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Denis Ciocca <denis.ciocca@st.com>

diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
index 20239da1d0f7ac9aedfaae20f0a5acc745110256..c66e0a96f6e8aa9a3d6940e2f563b74e1cae0f8c 100644 (file)
--- a/include/linux/iio/trigger.h
+++ b/include/linux/iio/trigger.h
@@ -12,6 +12,7 @@
 #ifndef _IIO_TRIGGER_H_
 #define _IIO_TRIGGER_H_
 
+#ifdef CONFIG_IIO_TRIGGER
 struct iio_subirq {
        bool enabled;
 };
@@ -117,4 +118,8 @@ irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
 __printf(1, 2) struct iio_trigger *iio_trigger_alloc(const char *fmt, ...);
 void iio_trigger_free(struct iio_trigger *trig);
 
+#else
+struct iio_trigger;
+struct iio_trigger_ops;
+#endif
 #endif /* _IIO_TRIGGER_H_ */