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1 | /* |
2 | * PPS API kernel header | |
3 | * | |
4 | * Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/pps.h> | |
22 | ||
23 | #include <linux/cdev.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/time.h> | |
26 | ||
27 | /* | |
28 | * Global defines | |
29 | */ | |
30 | ||
31 | /* The specific PPS source info */ | |
32 | struct pps_source_info { | |
33 | char name[PPS_MAX_NAME_LEN]; /* simbolic name */ | |
34 | char path[PPS_MAX_NAME_LEN]; /* path of connected device */ | |
35 | int mode; /* PPS's allowed mode */ | |
36 | ||
37 | void (*echo)(int source, int event, void *data); /* PPS echo function */ | |
38 | ||
39 | struct module *owner; | |
40 | struct device *dev; | |
41 | }; | |
42 | ||
43 | /* The main struct */ | |
44 | struct pps_device { | |
45 | struct pps_source_info info; /* PSS source info */ | |
46 | ||
47 | struct pps_kparams params; /* PPS's current params */ | |
48 | ||
49 | __u32 assert_sequence; /* PPS' assert event seq # */ | |
50 | __u32 clear_sequence; /* PPS' clear event seq # */ | |
51 | struct pps_ktime assert_tu; | |
52 | struct pps_ktime clear_tu; | |
53 | int current_mode; /* PPS mode at event time */ | |
54 | ||
55 | int go; /* PPS event is arrived? */ | |
56 | wait_queue_head_t queue; /* PPS event queue */ | |
57 | ||
58 | unsigned int id; /* PPS source unique ID */ | |
59 | struct cdev cdev; | |
60 | struct device *dev; | |
61 | int devno; | |
62 | struct fasync_struct *async_queue; /* fasync method */ | |
63 | spinlock_t lock; | |
64 | ||
65 | atomic_t usage; /* usage count */ | |
66 | }; | |
67 | ||
68 | /* | |
69 | * Global variables | |
70 | */ | |
71 | ||
72 | extern spinlock_t pps_idr_lock; | |
73 | extern struct idr pps_idr; | |
74 | extern struct timespec pps_irq_ts[]; | |
75 | ||
76 | extern struct device_attribute pps_attrs[]; | |
77 | ||
78 | /* | |
79 | * Exported functions | |
80 | */ | |
81 | ||
82 | struct pps_device *pps_get_source(int source); | |
83 | extern void pps_put_source(struct pps_device *pps); | |
84 | extern int pps_register_source(struct pps_source_info *info, | |
85 | int default_params); | |
86 | extern void pps_unregister_source(int source); | |
87 | extern int pps_register_cdev(struct pps_device *pps); | |
88 | extern void pps_unregister_cdev(struct pps_device *pps); | |
89 | extern void pps_event(int source, struct pps_ktime *ts, int event, void *data); |