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d94ba80e RC |
1 | /* |
2 | * PTP 1588 clock support - character device implementation. | |
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 | #include <linux/module.h> | |
21 | #include <linux/posix-clock.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/sched.h> | |
24 | ||
25 | #include "ptp_private.h" | |
26 | ||
27 | int ptp_open(struct posix_clock *pc, fmode_t fmode) | |
28 | { | |
29 | return 0; | |
30 | } | |
31 | ||
32 | long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) | |
33 | { | |
34 | struct ptp_clock_caps caps; | |
35 | struct ptp_clock_request req; | |
36 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
37 | struct ptp_clock_info *ops = ptp->info; | |
38 | int enable, err = 0; | |
39 | ||
40 | switch (cmd) { | |
41 | ||
42 | case PTP_CLOCK_GETCAPS: | |
43 | memset(&caps, 0, sizeof(caps)); | |
44 | caps.max_adj = ptp->info->max_adj; | |
45 | caps.n_alarm = ptp->info->n_alarm; | |
46 | caps.n_ext_ts = ptp->info->n_ext_ts; | |
47 | caps.n_per_out = ptp->info->n_per_out; | |
48 | caps.pps = ptp->info->pps; | |
49 | err = copy_to_user((void __user *)arg, &caps, sizeof(caps)); | |
50 | break; | |
51 | ||
52 | case PTP_EXTTS_REQUEST: | |
53 | if (copy_from_user(&req.extts, (void __user *)arg, | |
54 | sizeof(req.extts))) { | |
55 | err = -EFAULT; | |
56 | break; | |
57 | } | |
58 | if (req.extts.index >= ops->n_ext_ts) { | |
59 | err = -EINVAL; | |
60 | break; | |
61 | } | |
62 | req.type = PTP_CLK_REQ_EXTTS; | |
63 | enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; | |
64 | err = ops->enable(ops, &req, enable); | |
65 | break; | |
66 | ||
67 | case PTP_PEROUT_REQUEST: | |
68 | if (copy_from_user(&req.perout, (void __user *)arg, | |
69 | sizeof(req.perout))) { | |
70 | err = -EFAULT; | |
71 | break; | |
72 | } | |
73 | if (req.perout.index >= ops->n_per_out) { | |
74 | err = -EINVAL; | |
75 | break; | |
76 | } | |
77 | req.type = PTP_CLK_REQ_PEROUT; | |
78 | enable = req.perout.period.sec || req.perout.period.nsec; | |
79 | err = ops->enable(ops, &req, enable); | |
80 | break; | |
81 | ||
82 | case PTP_ENABLE_PPS: | |
83 | if (!capable(CAP_SYS_TIME)) | |
84 | return -EPERM; | |
85 | req.type = PTP_CLK_REQ_PPS; | |
86 | enable = arg ? 1 : 0; | |
87 | err = ops->enable(ops, &req, enable); | |
88 | break; | |
89 | ||
90 | default: | |
91 | err = -ENOTTY; | |
92 | break; | |
93 | } | |
94 | return err; | |
95 | } | |
96 | ||
97 | unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) | |
98 | { | |
99 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
100 | ||
101 | poll_wait(fp, &ptp->tsev_wq, wait); | |
102 | ||
103 | return queue_cnt(&ptp->tsevq) ? POLLIN : 0; | |
104 | } | |
105 | ||
106 | ssize_t ptp_read(struct posix_clock *pc, | |
107 | uint rdflags, char __user *buf, size_t cnt) | |
108 | { | |
109 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
110 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
111 | struct ptp_extts_event event[PTP_BUF_TIMESTAMPS]; | |
112 | unsigned long flags; | |
113 | size_t qcnt, i; | |
114 | ||
115 | if (cnt % sizeof(struct ptp_extts_event) != 0) | |
116 | return -EINVAL; | |
117 | ||
118 | if (cnt > sizeof(event)) | |
119 | cnt = sizeof(event); | |
120 | ||
121 | cnt = cnt / sizeof(struct ptp_extts_event); | |
122 | ||
123 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
124 | return -ERESTARTSYS; | |
125 | ||
126 | if (wait_event_interruptible(ptp->tsev_wq, | |
127 | ptp->defunct || queue_cnt(queue))) { | |
128 | mutex_unlock(&ptp->tsevq_mux); | |
129 | return -ERESTARTSYS; | |
130 | } | |
131 | ||
132 | if (ptp->defunct) | |
133 | return -ENODEV; | |
134 | ||
135 | spin_lock_irqsave(&queue->lock, flags); | |
136 | ||
137 | qcnt = queue_cnt(queue); | |
138 | ||
139 | if (cnt > qcnt) | |
140 | cnt = qcnt; | |
141 | ||
142 | for (i = 0; i < cnt; i++) { | |
143 | event[i] = queue->buf[queue->head]; | |
144 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
145 | } | |
146 | ||
147 | spin_unlock_irqrestore(&queue->lock, flags); | |
148 | ||
149 | cnt = cnt * sizeof(struct ptp_extts_event); | |
150 | ||
151 | mutex_unlock(&ptp->tsevq_mux); | |
152 | ||
153 | if (copy_to_user(buf, event, cnt)) { | |
154 | mutex_unlock(&ptp->tsevq_mux); | |
155 | return -EFAULT; | |
156 | } | |
157 | ||
158 | return cnt; | |
159 | } |