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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; | |
215b13dd | 36 | struct ptp_sys_offset sysoff; |
d94ba80e RC |
37 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); |
38 | struct ptp_clock_info *ops = ptp->info; | |
215b13dd RC |
39 | struct ptp_clock_time *pct; |
40 | struct timespec ts; | |
d94ba80e | 41 | int enable, err = 0; |
215b13dd | 42 | unsigned int i; |
d94ba80e RC |
43 | |
44 | switch (cmd) { | |
45 | ||
46 | case PTP_CLOCK_GETCAPS: | |
47 | memset(&caps, 0, sizeof(caps)); | |
48 | caps.max_adj = ptp->info->max_adj; | |
49 | caps.n_alarm = ptp->info->n_alarm; | |
50 | caps.n_ext_ts = ptp->info->n_ext_ts; | |
51 | caps.n_per_out = ptp->info->n_per_out; | |
52 | caps.pps = ptp->info->pps; | |
e23ef227 DC |
53 | if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) |
54 | err = -EFAULT; | |
d94ba80e RC |
55 | break; |
56 | ||
57 | case PTP_EXTTS_REQUEST: | |
58 | if (copy_from_user(&req.extts, (void __user *)arg, | |
59 | sizeof(req.extts))) { | |
60 | err = -EFAULT; | |
61 | break; | |
62 | } | |
63 | if (req.extts.index >= ops->n_ext_ts) { | |
64 | err = -EINVAL; | |
65 | break; | |
66 | } | |
67 | req.type = PTP_CLK_REQ_EXTTS; | |
68 | enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; | |
69 | err = ops->enable(ops, &req, enable); | |
70 | break; | |
71 | ||
72 | case PTP_PEROUT_REQUEST: | |
73 | if (copy_from_user(&req.perout, (void __user *)arg, | |
74 | sizeof(req.perout))) { | |
75 | err = -EFAULT; | |
76 | break; | |
77 | } | |
78 | if (req.perout.index >= ops->n_per_out) { | |
79 | err = -EINVAL; | |
80 | break; | |
81 | } | |
82 | req.type = PTP_CLK_REQ_PEROUT; | |
83 | enable = req.perout.period.sec || req.perout.period.nsec; | |
84 | err = ops->enable(ops, &req, enable); | |
85 | break; | |
86 | ||
87 | case PTP_ENABLE_PPS: | |
88 | if (!capable(CAP_SYS_TIME)) | |
89 | return -EPERM; | |
90 | req.type = PTP_CLK_REQ_PPS; | |
91 | enable = arg ? 1 : 0; | |
92 | err = ops->enable(ops, &req, enable); | |
93 | break; | |
94 | ||
215b13dd RC |
95 | case PTP_SYS_OFFSET: |
96 | if (copy_from_user(&sysoff, (void __user *)arg, | |
97 | sizeof(sysoff))) { | |
98 | err = -EFAULT; | |
99 | break; | |
100 | } | |
101 | if (sysoff.n_samples > PTP_MAX_SAMPLES) { | |
102 | err = -EINVAL; | |
103 | break; | |
104 | } | |
105 | pct = &sysoff.ts[0]; | |
106 | for (i = 0; i < sysoff.n_samples; i++) { | |
107 | getnstimeofday(&ts); | |
108 | pct->sec = ts.tv_sec; | |
109 | pct->nsec = ts.tv_nsec; | |
110 | pct++; | |
111 | ptp->info->gettime(ptp->info, &ts); | |
112 | pct->sec = ts.tv_sec; | |
113 | pct->nsec = ts.tv_nsec; | |
114 | pct++; | |
115 | } | |
116 | getnstimeofday(&ts); | |
117 | pct->sec = ts.tv_sec; | |
118 | pct->nsec = ts.tv_nsec; | |
119 | if (copy_to_user((void __user *)arg, &sysoff, sizeof(sysoff))) | |
120 | err = -EFAULT; | |
121 | break; | |
122 | ||
d94ba80e RC |
123 | default: |
124 | err = -ENOTTY; | |
125 | break; | |
126 | } | |
127 | return err; | |
128 | } | |
129 | ||
130 | unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) | |
131 | { | |
132 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
133 | ||
134 | poll_wait(fp, &ptp->tsev_wq, wait); | |
135 | ||
136 | return queue_cnt(&ptp->tsevq) ? POLLIN : 0; | |
137 | } | |
138 | ||
139 | ssize_t ptp_read(struct posix_clock *pc, | |
140 | uint rdflags, char __user *buf, size_t cnt) | |
141 | { | |
142 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
143 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
144 | struct ptp_extts_event event[PTP_BUF_TIMESTAMPS]; | |
145 | unsigned long flags; | |
146 | size_t qcnt, i; | |
147 | ||
148 | if (cnt % sizeof(struct ptp_extts_event) != 0) | |
149 | return -EINVAL; | |
150 | ||
151 | if (cnt > sizeof(event)) | |
152 | cnt = sizeof(event); | |
153 | ||
154 | cnt = cnt / sizeof(struct ptp_extts_event); | |
155 | ||
156 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
157 | return -ERESTARTSYS; | |
158 | ||
159 | if (wait_event_interruptible(ptp->tsev_wq, | |
160 | ptp->defunct || queue_cnt(queue))) { | |
161 | mutex_unlock(&ptp->tsevq_mux); | |
162 | return -ERESTARTSYS; | |
163 | } | |
164 | ||
fb5a18cf DC |
165 | if (ptp->defunct) { |
166 | mutex_unlock(&ptp->tsevq_mux); | |
d94ba80e | 167 | return -ENODEV; |
fb5a18cf | 168 | } |
d94ba80e RC |
169 | |
170 | spin_lock_irqsave(&queue->lock, flags); | |
171 | ||
172 | qcnt = queue_cnt(queue); | |
173 | ||
174 | if (cnt > qcnt) | |
175 | cnt = qcnt; | |
176 | ||
177 | for (i = 0; i < cnt; i++) { | |
178 | event[i] = queue->buf[queue->head]; | |
179 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
180 | } | |
181 | ||
182 | spin_unlock_irqrestore(&queue->lock, flags); | |
183 | ||
184 | cnt = cnt * sizeof(struct ptp_extts_event); | |
185 | ||
186 | mutex_unlock(&ptp->tsevq_mux); | |
187 | ||
fb5a18cf | 188 | if (copy_to_user(buf, event, cnt)) |
d94ba80e | 189 | return -EFAULT; |
d94ba80e RC |
190 | |
191 | return cnt; | |
192 | } |