2 * PTP 1588 clock support - character device implementation.
4 * Copyright (C) 2010 OMICRON electronics GmbH
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.
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.
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.
20 #include <linux/module.h>
21 #include <linux/posix-clock.h>
22 #include <linux/poll.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
26 #include "ptp_private.h"
28 int ptp_open(struct posix_clock
*pc
, fmode_t fmode
)
33 long ptp_ioctl(struct posix_clock
*pc
, unsigned int cmd
, unsigned long arg
)
35 struct ptp_clock_caps caps
;
36 struct ptp_clock_request req
;
37 struct ptp_sys_offset
*sysoff
= NULL
;
38 struct ptp_clock
*ptp
= container_of(pc
, struct ptp_clock
, clock
);
39 struct ptp_clock_info
*ops
= ptp
->info
;
40 struct ptp_clock_time
*pct
;
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
;
54 if (copy_to_user((void __user
*)arg
, &caps
, sizeof(caps
)))
58 case PTP_EXTTS_REQUEST
:
59 if (copy_from_user(&req
.extts
, (void __user
*)arg
,
64 if (req
.extts
.index
>= ops
->n_ext_ts
) {
68 req
.type
= PTP_CLK_REQ_EXTTS
;
69 enable
= req
.extts
.flags
& PTP_ENABLE_FEATURE
? 1 : 0;
70 err
= ops
->enable(ops
, &req
, enable
);
73 case PTP_PEROUT_REQUEST
:
74 if (copy_from_user(&req
.perout
, (void __user
*)arg
,
75 sizeof(req
.perout
))) {
79 if (req
.perout
.index
>= ops
->n_per_out
) {
83 req
.type
= PTP_CLK_REQ_PEROUT
;
84 enable
= req
.perout
.period
.sec
|| req
.perout
.period
.nsec
;
85 err
= ops
->enable(ops
, &req
, enable
);
89 if (!capable(CAP_SYS_TIME
))
91 req
.type
= PTP_CLK_REQ_PPS
;
93 err
= ops
->enable(ops
, &req
, enable
);
97 sysoff
= kmalloc(sizeof(*sysoff
), GFP_KERNEL
);
102 if (copy_from_user(sysoff
, (void __user
*)arg
,
107 if (sysoff
->n_samples
> PTP_MAX_SAMPLES
) {
111 pct
= &sysoff
->ts
[0];
112 for (i
= 0; i
< sysoff
->n_samples
; i
++) {
114 pct
->sec
= ts
.tv_sec
;
115 pct
->nsec
= ts
.tv_nsec
;
117 ptp
->info
->gettime(ptp
->info
, &ts
);
118 pct
->sec
= ts
.tv_sec
;
119 pct
->nsec
= ts
.tv_nsec
;
123 pct
->sec
= ts
.tv_sec
;
124 pct
->nsec
= ts
.tv_nsec
;
125 if (copy_to_user((void __user
*)arg
, sysoff
, sizeof(*sysoff
)))
138 unsigned int ptp_poll(struct posix_clock
*pc
, struct file
*fp
, poll_table
*wait
)
140 struct ptp_clock
*ptp
= container_of(pc
, struct ptp_clock
, clock
);
142 poll_wait(fp
, &ptp
->tsev_wq
, wait
);
144 return queue_cnt(&ptp
->tsevq
) ? POLLIN
: 0;
147 #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
149 ssize_t
ptp_read(struct posix_clock
*pc
,
150 uint rdflags
, char __user
*buf
, size_t cnt
)
152 struct ptp_clock
*ptp
= container_of(pc
, struct ptp_clock
, clock
);
153 struct timestamp_event_queue
*queue
= &ptp
->tsevq
;
154 struct ptp_extts_event
*event
;
159 if (cnt
% sizeof(struct ptp_extts_event
) != 0)
162 if (cnt
> EXTTS_BUFSIZE
)
165 cnt
= cnt
/ sizeof(struct ptp_extts_event
);
167 if (mutex_lock_interruptible(&ptp
->tsevq_mux
))
170 if (wait_event_interruptible(ptp
->tsev_wq
,
171 ptp
->defunct
|| queue_cnt(queue
))) {
172 mutex_unlock(&ptp
->tsevq_mux
);
177 mutex_unlock(&ptp
->tsevq_mux
);
181 event
= kmalloc(EXTTS_BUFSIZE
, GFP_KERNEL
);
183 mutex_unlock(&ptp
->tsevq_mux
);
187 spin_lock_irqsave(&queue
->lock
, flags
);
189 qcnt
= queue_cnt(queue
);
194 for (i
= 0; i
< cnt
; i
++) {
195 event
[i
] = queue
->buf
[queue
->head
];
196 queue
->head
= (queue
->head
+ 1) % PTP_MAX_TIMESTAMPS
;
199 spin_unlock_irqrestore(&queue
->lock
, flags
);
201 cnt
= cnt
* sizeof(struct ptp_extts_event
);
203 mutex_unlock(&ptp
->tsevq_mux
);
206 if (copy_to_user(buf
, event
, cnt
))
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