mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 17:53:56 +08:00
10f146639f
Add a "type" device attribute and a "GNSS_TYPE" uevent variable which can be used to determine the type of a GNSS receiver. The currently identified types reflect the protocol(s) supported by a receiver: "NMEA" NMEA 0183 "SiRF" SiRF Binary "UBX" UBX Note that both SiRF and UBX type receivers typically support a subset of NMEA 0183 with vendor extensions (e.g. to allow switching to the vendor protocol). Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/* 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 */
|