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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * PPS generator API kernel header
4 *
5 * Copyright (C) 2024 Rodolfo Giometti <giometti@enneenne.com>
6 */
7
8#ifndef LINUX_PPS_GEN_KERNEL_H
9#define LINUX_PPS_GEN_KERNEL_H
10
11#include <linux/pps_gen.h>
12#include <linux/cdev.h>
13#include <linux/device.h>
14
15/*
16 * Global defines
17 */
18
19#define PPS_GEN_MAX_SOURCES 16 /* should be enough... */
20
21struct pps_gen_device;
22
23/**
24 * struct pps_gen_source_info - the specific PPS generator info
25 * @use_system_clock: true, if the system clock is used to generate pulses
26 * @get_time: query the time stored into the generator clock
27 * @enable: enable/disable the PPS pulses generation
28 *
29 * This is the main generator struct where all needed information must be
30 * placed before calling the pps_gen_register_source().
31 */
32struct pps_gen_source_info {
33 bool use_system_clock;
34
35 int (*get_time)(struct pps_gen_device *pps_gen,
36 struct timespec64 *time);
37 int (*enable)(struct pps_gen_device *pps_gen, bool enable);
38
39/* private: internal use only */
40 struct module *owner;
41 struct device *parent; /* for device_create */
42};
43
44/* The main struct */
45struct pps_gen_device {
46 struct pps_gen_source_info info; /* PSS generator info */
47 bool enabled; /* PSS generator status */
48
49 unsigned int event;
50 unsigned int sequence;
51
52 unsigned int last_ev; /* last PPS event id */
53 wait_queue_head_t queue; /* PPS event queue */
54
55 unsigned int id; /* PPS generator unique ID */
56 struct cdev cdev;
57 struct device *dev;
58 struct fasync_struct *async_queue; /* fasync method */
59 spinlock_t lock;
60};
61
62/*
63 * Global variables
64 */
65
66extern const struct attribute_group *pps_gen_groups[];
67
68/*
69 * Exported functions
70 */
71
72extern struct pps_gen_device *pps_gen_register_source(
73 struct pps_gen_source_info *info);
74extern void pps_gen_unregister_source(struct pps_gen_device *pps_gen);
75extern void pps_gen_event(struct pps_gen_device *pps_gen,
76 unsigned int event, void *data);
77
78#endif /* LINUX_PPS_GEN_KERNEL_H */