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/* 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 */
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