blob: 9d7542efb1750535246a4d276a2b346dad06c741 [file] [log] [blame]
Richard Cochrand94ba802011-04-22 12:03:08 +02001/*
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>
Richard Cochranc7ec0ba2012-11-26 01:44:34 +000024#include <linux/slab.h>
Richard Cochrand94ba802011-04-22 12:03:08 +020025
26#include "ptp_private.h"
27
28int ptp_open(struct posix_clock *pc, fmode_t fmode)
29{
30 return 0;
31}
32
33long 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;
Richard Cochran215b13d2012-10-31 06:19:07 +000037 struct ptp_sys_offset sysoff;
Richard Cochrand94ba802011-04-22 12:03:08 +020038 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
39 struct ptp_clock_info *ops = ptp->info;
Richard Cochran215b13d2012-10-31 06:19:07 +000040 struct ptp_clock_time *pct;
41 struct timespec ts;
Richard Cochrand94ba802011-04-22 12:03:08 +020042 int enable, err = 0;
Richard Cochran215b13d2012-10-31 06:19:07 +000043 unsigned int i;
Richard Cochrand94ba802011-04-22 12:03:08 +020044
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;
Dan Carpentere23ef222011-05-29 22:53:12 +030054 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
55 err = -EFAULT;
Richard Cochrand94ba802011-04-22 12:03:08 +020056 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
Richard Cochran215b13d2012-10-31 06:19:07 +000096 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
Richard Cochrand94ba802011-04-22 12:03:08 +0200124 default:
125 err = -ENOTTY;
126 break;
127 }
128 return err;
129}
130
131unsigned 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
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000140#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
141
Richard Cochrand94ba802011-04-22 12:03:08 +0200142ssize_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;
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000147 struct ptp_extts_event *event;
Richard Cochrand94ba802011-04-22 12:03:08 +0200148 unsigned long flags;
149 size_t qcnt, i;
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000150 int result;
Richard Cochrand94ba802011-04-22 12:03:08 +0200151
152 if (cnt % sizeof(struct ptp_extts_event) != 0)
153 return -EINVAL;
154
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000155 if (cnt > EXTTS_BUFSIZE)
156 cnt = EXTTS_BUFSIZE;
Richard Cochrand94ba802011-04-22 12:03:08 +0200157
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
Dan Carpenterfb5a18c2011-05-29 22:54:07 +0300169 if (ptp->defunct) {
170 mutex_unlock(&ptp->tsevq_mux);
Richard Cochrand94ba802011-04-22 12:03:08 +0200171 return -ENODEV;
Dan Carpenterfb5a18c2011-05-29 22:54:07 +0300172 }
Richard Cochrand94ba802011-04-22 12:03:08 +0200173
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000174 event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
175 if (!event) {
176 mutex_unlock(&ptp->tsevq_mux);
177 return -ENOMEM;
178 }
179
Richard Cochrand94ba802011-04-22 12:03:08 +0200180 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
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000198 result = cnt;
Dan Carpenterfb5a18c2011-05-29 22:54:07 +0300199 if (copy_to_user(buf, event, cnt))
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000200 result = -EFAULT;
Richard Cochrand94ba802011-04-22 12:03:08 +0200201
Richard Cochranc7ec0ba2012-11-26 01:44:34 +0000202 kfree(event);
203 return result;
Richard Cochrand94ba802011-04-22 12:03:08 +0200204}