LXR linux/include/linux/gnss.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * GNSS receiver support
   4 *
   5 * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
   6 */
   7
   8#ifndef _LINUX_GNSS_H
   9#define _LINUX_GNSS_H
  10
  11#include <linux/cdev.h>
  12#include <linux/device.h>
  13#include <linux/kfifo.h>
  14#include <linux/mutex.h>
  15#include <linux/rwsem.h>
  16#include <linux/types.h>
  17#include <linux/wait.h>
  18
  19struct gnss_device;
  20
  21enum gnss_type {
  22        GNSS_TYPE_NMEA = 0,
  23        GNSS_TYPE_SIRF,
  24        GNSS_TYPE_UBX,
  25
  26        GNSS_TYPE_COUNT
  27};
  28
  29struct gnss_operations {
  30        int (*open)(struct gnss_device *gdev);
  31        void (*close)(struct gnss_device *gdev);
  32        int (*write_raw)(struct gnss_device *gdev, const unsigned char *buf,
  33                                size_t count);
  34};
  35
  36struct gnss_device {
  37        struct device dev;
  38        struct cdev cdev;
  39        int id;
  40
  41        enum gnss_type type;
  42        unsigned long flags;
  43
  44        struct rw_semaphore rwsem;
  45        const struct gnss_operations *ops;
  46        unsigned int count;
  47        unsigned int disconnected:1;
  48
  49        struct mutex read_mutex;
  50        struct kfifo read_fifo;
  51        wait_queue_head_t read_queue;
  52
  53        struct mutex write_mutex;
  54        char *write_buf;
  55};
  56
  57struct gnss_device *gnss_allocate_device(struct device *parent);
  58void gnss_put_device(struct gnss_device *gdev);
  59int gnss_register_device(struct gnss_device *gdev);
  60void gnss_deregister_device(struct gnss_device *gdev);
  61
  62int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
  63                        size_t count);
  64
  65static inline void gnss_set_drvdata(struct gnss_device *gdev, void *data)
  66{
  67        dev_set_drvdata(&gdev->dev, data);
  68}
  69
  70static inline void *gnss_get_drvdata(struct gnss_device *gdev)
  71{
  72        return dev_get_drvdata(&gdev->dev);
  73}
  74
  75#endif /* _LINUX_GNSS_H */
  76