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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, | |
625239d4 | 25 | GNSS_TYPE_MTK, |
10f14663 JH |
26 | |
27 | GNSS_TYPE_COUNT | |
28 | }; | |
29 | ||
2b6a4403 JH |
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 | ||
10f14663 | 42 | enum gnss_type type; |
2b6a4403 JH |
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(&gdev->dev, data); | |
69 | } | |
70 | ||
71 | static inline void *gnss_get_drvdata(struct gnss_device *gdev) | |
72 | { | |
73 | return dev_get_drvdata(&gdev->dev); | |
74 | } | |
75 | ||
76 | #endif /* _LINUX_GNSS_H */ |