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 | |
19 | struct gnss_device; |
20 | |
21 | enum gnss_type { |
22 | GNSS_TYPE_NMEA = 0, |
23 | GNSS_TYPE_SIRF, |
24 | GNSS_TYPE_UBX, |
25 | GNSS_TYPE_MTK, |
26 | |
27 | GNSS_TYPE_COUNT |
28 | }; |
29 | |
30 | struct gnss_operations { |
31 | int (*open)(struct gnss_device *gdev); |
32 | void (*close)(struct gnss_device *gdev); |
33 | int (*write_raw)(struct gnss_device *gdev, const unsigned char *buf, |
34 | size_t count); |
35 | }; |
36 | |
37 | struct gnss_device { |
38 | struct device dev; |
39 | struct cdev cdev; |
40 | int id; |
41 | |
42 | enum gnss_type type; |
43 | unsigned long flags; |
44 | |
45 | struct rw_semaphore rwsem; |
46 | const struct gnss_operations *ops; |
47 | unsigned int count; |
48 | unsigned int disconnected:1; |
49 | |
50 | struct mutex read_mutex; |
51 | struct kfifo read_fifo; |
52 | wait_queue_head_t read_queue; |
53 | |
54 | struct mutex write_mutex; |
55 | char *write_buf; |
56 | }; |
57 | |
58 | struct gnss_device *gnss_allocate_device(struct device *parent); |
59 | void gnss_put_device(struct gnss_device *gdev); |
60 | int gnss_register_device(struct gnss_device *gdev); |
61 | void gnss_deregister_device(struct gnss_device *gdev); |
62 | |
63 | int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf, |
64 | size_t count); |
65 | |
66 | static inline void gnss_set_drvdata(struct gnss_device *gdev, void *data) |
67 | { |
68 | dev_set_drvdata(dev: &gdev->dev, data); |
69 | } |
70 | |
71 | static inline void *gnss_get_drvdata(struct gnss_device *gdev) |
72 | { |
73 | return dev_get_drvdata(dev: &gdev->dev); |
74 | } |
75 | |
76 | #endif /* _LINUX_GNSS_H */ |
77 | |