1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/staging/iio/kfifo_buf.h b/drivers/staging/iio/kfifo_buf.h
new file mode 100644
index 000000000000..8064383bf7c3
--- /dev/null
+++ b/drivers/staging/iio/kfifo_buf.h
@@ -0,0 +1,56 @@
+
+#include <linux/kfifo.h>
+#include "iio.h"
+#include "ring_generic.h"
+
+struct iio_kfifo {
+	struct iio_ring_buffer ring;
+	struct kfifo kf;
+	int use_count;
+	int update_needed;
+	struct mutex use_lock;
+};
+
+#define iio_to_kfifo(r) container_of(r, struct iio_kfifo, ring)
+
+int iio_create_kfifo(struct iio_ring_buffer **r);
+int iio_init_kfifo(struct iio_ring_buffer *r, struct iio_dev *indio_dev);
+void iio_exit_kfifo(struct iio_ring_buffer *r);
+void iio_free_kfifo(struct iio_ring_buffer *r);
+void iio_mark_kfifo_in_use(struct iio_ring_buffer *r);
+void iio_unmark_kfifo_in_use(struct iio_ring_buffer *r);
+
+int iio_store_to_kfifo(struct iio_ring_buffer *r, u8 *data, s64 timestamp);
+int iio_rip_kfifo(struct iio_ring_buffer *r,
+		size_t count,
+		char __user *buf,
+		int *dead_offset);
+
+int iio_request_update_kfifo(struct iio_ring_buffer *r);
+int iio_mark_update_needed_kfifo(struct iio_ring_buffer *r);
+
+int iio_get_bytes_per_datum_kfifo(struct iio_ring_buffer *r);
+int iio_set_bytes_per_datum_kfifo(struct iio_ring_buffer *r, size_t bpd);
+int iio_get_length_kfifo(struct iio_ring_buffer *r);
+int iio_set_length_kfifo(struct iio_ring_buffer *r, int length);
+
+static inline void iio_kfifo_register_funcs(struct iio_ring_access_funcs *ra)
+{
+	ra->mark_in_use = &iio_mark_kfifo_in_use;
+	ra->unmark_in_use = &iio_unmark_kfifo_in_use;
+
+	ra->store_to = &iio_store_to_kfifo;
+	ra->rip_lots = &iio_rip_kfifo;
+
+	ra->mark_param_change = &iio_mark_update_needed_kfifo;
+	ra->request_update = &iio_request_update_kfifo;
+
+	ra->get_bytes_per_datum = &iio_get_bytes_per_datum_kfifo;
+	ra->set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo;
+	ra->get_length = &iio_get_length_kfifo;
+	ra->set_length = &iio_set_length_kfifo;
+};
+
+struct iio_ring_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev);
+void iio_kfifo_free(struct iio_ring_buffer *r);
+