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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; | |
c3484c27 | 37 | struct ptp_sys_offset *sysoff = NULL; |
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 | 96 | case PTP_SYS_OFFSET: |
c3484c27 RC |
97 | sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL); |
98 | if (!sysoff) { | |
99 | err = -ENOMEM; | |
100 | break; | |
101 | } | |
102 | if (copy_from_user(sysoff, (void __user *)arg, | |
103 | sizeof(*sysoff))) { | |
215b13dd RC |
104 | err = -EFAULT; |
105 | break; | |
106 | } | |
c3484c27 | 107 | if (sysoff->n_samples > PTP_MAX_SAMPLES) { |
215b13dd RC |
108 | err = -EINVAL; |
109 | break; | |
110 | } | |
c3484c27 RC |
111 | pct = &sysoff->ts[0]; |
112 | for (i = 0; i < sysoff->n_samples; i++) { | |
215b13dd RC |
113 | getnstimeofday(&ts); |
114 | pct->sec = ts.tv_sec; | |
115 | pct->nsec = ts.tv_nsec; | |
116 | pct++; | |
117 | ptp->info->gettime(ptp->info, &ts); | |
118 | pct->sec = ts.tv_sec; | |
119 | pct->nsec = ts.tv_nsec; | |
120 | pct++; | |
121 | } | |
122 | getnstimeofday(&ts); | |
123 | pct->sec = ts.tv_sec; | |
124 | pct->nsec = ts.tv_nsec; | |
c3484c27 | 125 | if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff))) |
215b13dd RC |
126 | err = -EFAULT; |
127 | break; | |
128 | ||
d94ba80e RC |
129 | default: |
130 | err = -ENOTTY; | |
131 | break; | |
132 | } | |
c3484c27 RC |
133 | |
134 | kfree(sysoff); | |
d94ba80e RC |
135 | return err; |
136 | } | |
137 | ||
138 | unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) | |
139 | { | |
140 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
141 | ||
142 | poll_wait(fp, &ptp->tsev_wq, wait); | |
143 | ||
144 | return queue_cnt(&ptp->tsevq) ? POLLIN : 0; | |
145 | } | |
146 | ||
c7ec0bad RC |
147 | #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event)) |
148 | ||
d94ba80e RC |
149 | ssize_t ptp_read(struct posix_clock *pc, |
150 | uint rdflags, char __user *buf, size_t cnt) | |
151 | { | |
152 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
153 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
c7ec0bad | 154 | struct ptp_extts_event *event; |
d94ba80e RC |
155 | unsigned long flags; |
156 | size_t qcnt, i; | |
c7ec0bad | 157 | int result; |
d94ba80e RC |
158 | |
159 | if (cnt % sizeof(struct ptp_extts_event) != 0) | |
160 | return -EINVAL; | |
161 | ||
c7ec0bad RC |
162 | if (cnt > EXTTS_BUFSIZE) |
163 | cnt = EXTTS_BUFSIZE; | |
d94ba80e RC |
164 | |
165 | cnt = cnt / sizeof(struct ptp_extts_event); | |
166 | ||
167 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
168 | return -ERESTARTSYS; | |
169 | ||
170 | if (wait_event_interruptible(ptp->tsev_wq, | |
171 | ptp->defunct || queue_cnt(queue))) { | |
172 | mutex_unlock(&ptp->tsevq_mux); | |
173 | return -ERESTARTSYS; | |
174 | } | |
175 | ||
fb5a18cf DC |
176 | if (ptp->defunct) { |
177 | mutex_unlock(&ptp->tsevq_mux); | |
d94ba80e | 178 | return -ENODEV; |
fb5a18cf | 179 | } |
d94ba80e | 180 | |
c7ec0bad RC |
181 | event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL); |
182 | if (!event) { | |
183 | mutex_unlock(&ptp->tsevq_mux); | |
184 | return -ENOMEM; | |
185 | } | |
186 | ||
d94ba80e RC |
187 | spin_lock_irqsave(&queue->lock, flags); |
188 | ||
189 | qcnt = queue_cnt(queue); | |
190 | ||
191 | if (cnt > qcnt) | |
192 | cnt = qcnt; | |
193 | ||
194 | for (i = 0; i < cnt; i++) { | |
195 | event[i] = queue->buf[queue->head]; | |
196 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
197 | } | |
198 | ||
199 | spin_unlock_irqrestore(&queue->lock, flags); | |
200 | ||
201 | cnt = cnt * sizeof(struct ptp_extts_event); | |
202 | ||
203 | mutex_unlock(&ptp->tsevq_mux); | |
204 | ||
c7ec0bad | 205 | result = cnt; |
fb5a18cf | 206 | if (copy_to_user(buf, event, cnt)) |
c7ec0bad | 207 | result = -EFAULT; |
d94ba80e | 208 | |
c7ec0bad RC |
209 | kfree(event); |
210 | return result; | |
d94ba80e | 211 | } |