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/* SPDX-License-Identifier: GPL-2.0 */ /* * GNSS receiver support * * Copyright (C) 2018 Johan Hovold */ #ifndef _LINUX_GNSS_H #define _LINUX_GNSS_H #include #include #include #include #include #include #include struct gnss_device; enum gnss_type { GNSS_TYPE_NMEA = 0, GNSS_TYPE_SIRF, GNSS_TYPE_UBX, GNSS_TYPE_MTK, 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