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2b6a4403 JH |
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 | ||
10f14663 JH |
21 | enum gnss_type { |
22 | GNSS_TYPE_NMEA = 0, | |
23 | GNSS_TYPE_SIRF, | |
24 | GNSS_TYPE_UBX, | |
25 | ||
26 | GNSS_TYPE_COUNT | |
27 | }; | |
28 | ||
2b6a4403 JH |
29 | struct 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 | ||
36 | struct gnss_device { | |
37 | struct device dev; | |
38 | struct cdev cdev; | |
39 | int id; | |
40 | ||
10f14663 | 41 | enum gnss_type type; |
2b6a4403 JH |
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 | ||
57 | struct gnss_device *gnss_allocate_device(struct device *parent); | |
58 | void gnss_put_device(struct gnss_device *gdev); | |
59 | int gnss_register_device(struct gnss_device *gdev); | |
60 | void gnss_deregister_device(struct gnss_device *gdev); | |
61 | ||
62 | int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf, | |
63 | size_t count); | |
64 | ||
65 | static inline void gnss_set_drvdata(struct gnss_device *gdev, void *data) | |
66 | { | |
67 | dev_set_drvdata(&gdev->dev, data); | |
68 | } | |
69 | ||
70 | static inline void *gnss_get_drvdata(struct gnss_device *gdev) | |
71 | { | |
72 | return dev_get_drvdata(&gdev->dev); | |
73 | } | |
74 | ||
75 | #endif /* _LINUX_GNSS_H */ |