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1 | /* |
2 | * PTP 1588 clock support - private declarations for the core module. | |
3 | * | |
4 | * Copyright (C) 2010 OMICRON electronics GmbH | |
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 | #ifndef _PTP_PRIVATE_H_ | |
21 | #define _PTP_PRIVATE_H_ | |
22 | ||
23 | #include <linux/cdev.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/mutex.h> | |
26 | #include <linux/posix-clock.h> | |
27 | #include <linux/ptp_clock.h> | |
28 | #include <linux/ptp_clock_kernel.h> | |
29 | #include <linux/time.h> | |
30 | ||
31 | #define PTP_MAX_TIMESTAMPS 128 | |
32 | #define PTP_BUF_TIMESTAMPS 30 | |
33 | ||
34 | struct timestamp_event_queue { | |
35 | struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS]; | |
36 | int head; | |
37 | int tail; | |
38 | spinlock_t lock; | |
39 | }; | |
40 | ||
41 | struct ptp_clock { | |
42 | struct posix_clock clock; | |
43 | struct device *dev; | |
44 | struct ptp_clock_info *info; | |
45 | dev_t devid; | |
46 | int index; /* index into clocks.map */ | |
47 | struct pps_device *pps_source; | |
48 | struct timestamp_event_queue tsevq; /* simple fifo for time stamps */ | |
49 | struct mutex tsevq_mux; /* one process at a time reading the fifo */ | |
50 | wait_queue_head_t tsev_wq; | |
51 | int defunct; /* tells readers to go away when clock is being removed */ | |
52 | }; | |
53 | ||
54 | /* | |
55 | * The function queue_cnt() is safe for readers to call without | |
56 | * holding q->lock. Readers use this function to verify that the queue | |
57 | * is nonempty before proceeding with a dequeue operation. The fact | |
58 | * that a writer might concurrently increment the tail does not | |
59 | * matter, since the queue remains nonempty nonetheless. | |
60 | */ | |
61 | static inline int queue_cnt(struct timestamp_event_queue *q) | |
62 | { | |
63 | int cnt = q->tail - q->head; | |
64 | return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt; | |
65 | } | |
66 | ||
67 | /* | |
68 | * see ptp_chardev.c | |
69 | */ | |
70 | ||
71 | long ptp_ioctl(struct posix_clock *pc, | |
72 | unsigned int cmd, unsigned long arg); | |
73 | ||
74 | int ptp_open(struct posix_clock *pc, fmode_t fmode); | |
75 | ||
76 | ssize_t ptp_read(struct posix_clock *pc, | |
77 | uint flags, char __user *buf, size_t cnt); | |
78 | ||
79 | uint ptp_poll(struct posix_clock *pc, | |
80 | struct file *fp, poll_table *wait); | |
81 | ||
82 | /* | |
83 | * see ptp_sysfs.c | |
84 | */ | |
85 | ||
86 | extern struct device_attribute ptp_dev_attrs[]; | |
87 | ||
88 | int ptp_cleanup_sysfs(struct ptp_clock *ptp); | |
89 | ||
90 | int ptp_populate_sysfs(struct ptp_clock *ptp); | |
91 | ||
92 | #endif |