v4.19.13 snapshot.
diff --git a/include/linux/gnss.h b/include/linux/gnss.h
new file mode 100644
index 0000000..4354697
--- /dev/null
+++ b/include/linux/gnss.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * GNSS receiver support
+ *
+ * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
+ */
+
+#ifndef _LINUX_GNSS_H
+#define _LINUX_GNSS_H
+
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/kfifo.h>
+#include <linux/mutex.h>
+#include <linux/rwsem.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+
+struct gnss_device;
+
+enum gnss_type {
+ GNSS_TYPE_NMEA = 0,
+ GNSS_TYPE_SIRF,
+ GNSS_TYPE_UBX,
+
+ GNSS_TYPE_COUNT
+};
+
+struct gnss_operations {
+ int (*open)(struct gnss_device *gdev);
+ void (*close)(struct gnss_device *gdev);
+ int (*write_raw)(struct gnss_device *gdev, const unsigned char *buf,
+ size_t count);
+};
+
+struct gnss_device {
+ struct device dev;
+ struct cdev cdev;
+ int id;
+
+ enum gnss_type type;
+ unsigned long flags;
+
+ struct rw_semaphore rwsem;
+ const struct gnss_operations *ops;
+ unsigned int count;
+ unsigned int disconnected:1;
+
+ struct mutex read_mutex;
+ struct kfifo read_fifo;
+ wait_queue_head_t read_queue;
+
+ struct mutex write_mutex;
+ char *write_buf;
+};
+
+struct gnss_device *gnss_allocate_device(struct device *parent);
+void gnss_put_device(struct gnss_device *gdev);
+int gnss_register_device(struct gnss_device *gdev);
+void gnss_deregister_device(struct gnss_device *gdev);
+
+int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
+ size_t count);
+
+static inline void gnss_set_drvdata(struct gnss_device *gdev, void *data)
+{
+ dev_set_drvdata(&gdev->dev, data);
+}
+
+static inline void *gnss_get_drvdata(struct gnss_device *gdev)
+{
+ return dev_get_drvdata(&gdev->dev);
+}
+
+#endif /* _LINUX_GNSS_H */