1 files changed, 75 insertions, 0 deletions

diff --git a/include/linux/gnss.h b/include/linux/gnss.h
new file mode 100644
index 000000000000..43546977098c
--- /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 */