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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> | |
c7ec0bad | 24 | #include <linux/slab.h> |
d94ba80e RC |
25 | |
26 | #include "ptp_private.h" | |
27 | ||
28 | int ptp_open(struct posix_clock *pc, fmode_t fmode) | |
29 | { | |
30 | return 0; | |
31 | } | |
32 | ||
33 | long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) | |
34 | { | |
35 | struct ptp_clock_caps caps; | |
36 | struct ptp_clock_request req; | |
215b13dd | 37 | struct ptp_sys_offset sysoff; |
d94ba80e RC |
38 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); |
39 | struct ptp_clock_info *ops = ptp->info; | |
215b13dd RC |
40 | struct ptp_clock_time *pct; |
41 | struct timespec ts; | |
d94ba80e | 42 | int enable, err = 0; |
215b13dd | 43 | unsigned int i; |
d94ba80e RC |
44 | |
45 | switch (cmd) { | |
46 | ||
47 | case PTP_CLOCK_GETCAPS: | |
48 | memset(&caps, 0, sizeof(caps)); | |
49 | caps.max_adj = ptp->info->max_adj; | |
50 | caps.n_alarm = ptp->info->n_alarm; | |
51 | caps.n_ext_ts = ptp->info->n_ext_ts; | |
52 | caps.n_per_out = ptp->info->n_per_out; | |
53 | caps.pps = ptp->info->pps; | |
e23ef227 DC |
54 | if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) |
55 | err = -EFAULT; | |
d94ba80e RC |
56 | break; |
57 | ||
58 | case PTP_EXTTS_REQUEST: | |
59 | if (copy_from_user(&req.extts, (void __user *)arg, | |
60 | sizeof(req.extts))) { | |
61 | err = -EFAULT; | |
62 | break; | |
63 | } | |
64 | if (req.extts.index >= ops->n_ext_ts) { | |
65 | err = -EINVAL; | |
66 | break; | |
67 | } | |
68 | req.type = PTP_CLK_REQ_EXTTS; | |
69 | enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; | |
70 | err = ops->enable(ops, &req, enable); | |
71 | break; | |
72 | ||
73 | case PTP_PEROUT_REQUEST: | |
74 | if (copy_from_user(&req.perout, (void __user *)arg, | |
75 | sizeof(req.perout))) { | |
76 | err = -EFAULT; | |
77 | break; | |
78 | } | |
79 | if (req.perout.index >= ops->n_per_out) { | |
80 | err = -EINVAL; | |
81 | break; | |
82 | } | |
83 | req.type = PTP_CLK_REQ_PEROUT; | |
84 | enable = req.perout.period.sec || req.perout.period.nsec; | |
85 | err = ops->enable(ops, &req, enable); | |
86 | break; | |
87 | ||
88 | case PTP_ENABLE_PPS: | |
89 | if (!capable(CAP_SYS_TIME)) | |
90 | return -EPERM; | |
91 | req.type = PTP_CLK_REQ_PPS; | |
92 | enable = arg ? 1 : 0; | |
93 | err = ops->enable(ops, &req, enable); | |
94 | break; | |
95 | ||
215b13dd RC |
96 | case PTP_SYS_OFFSET: |
97 | if (copy_from_user(&sysoff, (void __user *)arg, | |
98 | sizeof(sysoff))) { | |
99 | err = -EFAULT; | |
100 | break; | |
101 | } | |
102 | if (sysoff.n_samples > PTP_MAX_SAMPLES) { | |
103 | err = -EINVAL; | |
104 | break; | |
105 | } | |
106 | pct = &sysoff.ts[0]; | |
107 | for (i = 0; i < sysoff.n_samples; i++) { | |
108 | getnstimeofday(&ts); | |
109 | pct->sec = ts.tv_sec; | |
110 | pct->nsec = ts.tv_nsec; | |
111 | pct++; | |
112 | ptp->info->gettime(ptp->info, &ts); | |
113 | pct->sec = ts.tv_sec; | |
114 | pct->nsec = ts.tv_nsec; | |
115 | pct++; | |
116 | } | |
117 | getnstimeofday(&ts); | |
118 | pct->sec = ts.tv_sec; | |
119 | pct->nsec = ts.tv_nsec; | |
120 | if (copy_to_user((void __user *)arg, &sysoff, sizeof(sysoff))) | |
121 | err = -EFAULT; | |
122 | break; | |
123 | ||
d94ba80e RC |
124 | default: |
125 | err = -ENOTTY; | |
126 | break; | |
127 | } | |
128 | return err; | |
129 | } | |
130 | ||
131 | unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) | |
132 | { | |
133 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
134 | ||
135 | poll_wait(fp, &ptp->tsev_wq, wait); | |
136 | ||
137 | return queue_cnt(&ptp->tsevq) ? POLLIN : 0; | |
138 | } | |
139 | ||
c7ec0bad RC |
140 | #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event)) |
141 | ||
d94ba80e RC |
142 | ssize_t ptp_read(struct posix_clock *pc, |
143 | uint rdflags, char __user *buf, size_t cnt) | |
144 | { | |
145 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
146 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
c7ec0bad | 147 | struct ptp_extts_event *event; |
d94ba80e RC |
148 | unsigned long flags; |
149 | size_t qcnt, i; | |
c7ec0bad | 150 | int result; |
d94ba80e RC |
151 | |
152 | if (cnt % sizeof(struct ptp_extts_event) != 0) | |
153 | return -EINVAL; | |
154 | ||
c7ec0bad RC |
155 | if (cnt > EXTTS_BUFSIZE) |
156 | cnt = EXTTS_BUFSIZE; | |
d94ba80e RC |
157 | |
158 | cnt = cnt / sizeof(struct ptp_extts_event); | |
159 | ||
160 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
161 | return -ERESTARTSYS; | |
162 | ||
163 | if (wait_event_interruptible(ptp->tsev_wq, | |
164 | ptp->defunct || queue_cnt(queue))) { | |
165 | mutex_unlock(&ptp->tsevq_mux); | |
166 | return -ERESTARTSYS; | |
167 | } | |
168 | ||
fb5a18cf DC |
169 | if (ptp->defunct) { |
170 | mutex_unlock(&ptp->tsevq_mux); | |
d94ba80e | 171 | return -ENODEV; |
fb5a18cf | 172 | } |
d94ba80e | 173 | |
c7ec0bad RC |
174 | event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL); |
175 | if (!event) { | |
176 | mutex_unlock(&ptp->tsevq_mux); | |
177 | return -ENOMEM; | |
178 | } | |
179 | ||
d94ba80e RC |
180 | spin_lock_irqsave(&queue->lock, flags); |
181 | ||
182 | qcnt = queue_cnt(queue); | |
183 | ||
184 | if (cnt > qcnt) | |
185 | cnt = qcnt; | |
186 | ||
187 | for (i = 0; i < cnt; i++) { | |
188 | event[i] = queue->buf[queue->head]; | |
189 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
190 | } | |
191 | ||
192 | spin_unlock_irqrestore(&queue->lock, flags); | |
193 | ||
194 | cnt = cnt * sizeof(struct ptp_extts_event); | |
195 | ||
196 | mutex_unlock(&ptp->tsevq_mux); | |
197 | ||
c7ec0bad | 198 | result = cnt; |
fb5a18cf | 199 | if (copy_to_user(buf, event, cnt)) |
c7ec0bad | 200 | result = -EFAULT; |
d94ba80e | 201 | |
c7ec0bad RC |
202 | kfree(event); |
203 | return result; | |
d94ba80e | 204 | } |