357 lines
8.5 KiB
C
357 lines
8.5 KiB
C
/*
|
|
* PTP 1588 clock support - character device implementation.
|
|
*
|
|
* Copyright (C) 2010 OMICRON electronics GmbH
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/posix-clock.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/timekeeping.h>
|
|
|
|
#include "ptp_private.h"
|
|
|
|
static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
|
|
enum ptp_pin_function func, unsigned int chan)
|
|
{
|
|
struct ptp_clock_request rq;
|
|
int err = 0;
|
|
|
|
memset(&rq, 0, sizeof(rq));
|
|
|
|
switch (func) {
|
|
case PTP_PF_NONE:
|
|
break;
|
|
case PTP_PF_EXTTS:
|
|
rq.type = PTP_CLK_REQ_EXTTS;
|
|
rq.extts.index = chan;
|
|
err = ops->enable(ops, &rq, 0);
|
|
break;
|
|
case PTP_PF_PEROUT:
|
|
rq.type = PTP_CLK_REQ_PEROUT;
|
|
rq.perout.index = chan;
|
|
err = ops->enable(ops, &rq, 0);
|
|
break;
|
|
case PTP_PF_PHYSYNC:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
|
|
enum ptp_pin_function func, unsigned int chan)
|
|
{
|
|
struct ptp_clock_info *info = ptp->info;
|
|
struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin];
|
|
unsigned int i;
|
|
|
|
/* Check to see if any other pin previously had this function. */
|
|
for (i = 0; i < info->n_pins; i++) {
|
|
if (info->pin_config[i].func == func &&
|
|
info->pin_config[i].chan == chan) {
|
|
pin1 = &info->pin_config[i];
|
|
break;
|
|
}
|
|
}
|
|
if (pin1 && i == pin)
|
|
return 0;
|
|
|
|
/* Check the desired function and channel. */
|
|
switch (func) {
|
|
case PTP_PF_NONE:
|
|
break;
|
|
case PTP_PF_EXTTS:
|
|
if (chan >= info->n_ext_ts)
|
|
return -EINVAL;
|
|
break;
|
|
case PTP_PF_PEROUT:
|
|
if (chan >= info->n_per_out)
|
|
return -EINVAL;
|
|
break;
|
|
case PTP_PF_PHYSYNC:
|
|
if (chan != 0)
|
|
return -EINVAL;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (info->verify(info, pin, func, chan)) {
|
|
pr_err("driver cannot use function %u on pin %u\n", func, chan);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/* Disable whatever function was previously assigned. */
|
|
if (pin1) {
|
|
ptp_disable_pinfunc(info, func, chan);
|
|
pin1->func = PTP_PF_NONE;
|
|
pin1->chan = 0;
|
|
}
|
|
ptp_disable_pinfunc(info, pin2->func, pin2->chan);
|
|
pin2->func = func;
|
|
pin2->chan = chan;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ptp_open(struct posix_clock *pc, fmode_t fmode)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct ptp_clock_caps caps;
|
|
struct ptp_clock_request req;
|
|
struct ptp_sys_offset *sysoff = NULL;
|
|
struct ptp_sys_offset_precise precise_offset;
|
|
struct ptp_pin_desc pd;
|
|
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
|
|
struct ptp_clock_info *ops = ptp->info;
|
|
struct ptp_clock_time *pct;
|
|
struct timespec64 ts;
|
|
struct system_device_crosststamp xtstamp;
|
|
int enable, err = 0;
|
|
unsigned int i, pin_index;
|
|
|
|
switch (cmd) {
|
|
|
|
case PTP_CLOCK_GETCAPS:
|
|
memset(&caps, 0, sizeof(caps));
|
|
caps.max_adj = ptp->info->max_adj;
|
|
caps.n_alarm = ptp->info->n_alarm;
|
|
caps.n_ext_ts = ptp->info->n_ext_ts;
|
|
caps.n_per_out = ptp->info->n_per_out;
|
|
caps.pps = ptp->info->pps;
|
|
caps.n_pins = ptp->info->n_pins;
|
|
caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
|
|
if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case PTP_EXTTS_REQUEST:
|
|
if (copy_from_user(&req.extts, (void __user *)arg,
|
|
sizeof(req.extts))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if (req.extts.index >= ops->n_ext_ts) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
req.type = PTP_CLK_REQ_EXTTS;
|
|
enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
|
|
err = ops->enable(ops, &req, enable);
|
|
break;
|
|
|
|
case PTP_PEROUT_REQUEST:
|
|
if (copy_from_user(&req.perout, (void __user *)arg,
|
|
sizeof(req.perout))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if (req.perout.index >= ops->n_per_out) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
req.type = PTP_CLK_REQ_PEROUT;
|
|
enable = req.perout.period.sec || req.perout.period.nsec;
|
|
err = ops->enable(ops, &req, enable);
|
|
break;
|
|
|
|
case PTP_ENABLE_PPS:
|
|
if (!capable(CAP_SYS_TIME))
|
|
return -EPERM;
|
|
req.type = PTP_CLK_REQ_PPS;
|
|
enable = arg ? 1 : 0;
|
|
err = ops->enable(ops, &req, enable);
|
|
break;
|
|
|
|
case PTP_SYS_OFFSET_PRECISE:
|
|
if (!ptp->info->getcrosststamp) {
|
|
err = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
|
|
if (err)
|
|
break;
|
|
|
|
memset(&precise_offset, 0, sizeof(precise_offset));
|
|
ts = ktime_to_timespec64(xtstamp.device);
|
|
precise_offset.device.sec = ts.tv_sec;
|
|
precise_offset.device.nsec = ts.tv_nsec;
|
|
ts = ktime_to_timespec64(xtstamp.sys_realtime);
|
|
precise_offset.sys_realtime.sec = ts.tv_sec;
|
|
precise_offset.sys_realtime.nsec = ts.tv_nsec;
|
|
ts = ktime_to_timespec64(xtstamp.sys_monoraw);
|
|
precise_offset.sys_monoraw.sec = ts.tv_sec;
|
|
precise_offset.sys_monoraw.nsec = ts.tv_nsec;
|
|
if (copy_to_user((void __user *)arg, &precise_offset,
|
|
sizeof(precise_offset)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case PTP_SYS_OFFSET:
|
|
sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
|
|
if (IS_ERR(sysoff)) {
|
|
err = PTR_ERR(sysoff);
|
|
sysoff = NULL;
|
|
break;
|
|
}
|
|
if (sysoff->n_samples > PTP_MAX_SAMPLES) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
pct = &sysoff->ts[0];
|
|
for (i = 0; i < sysoff->n_samples; i++) {
|
|
getnstimeofday64(&ts);
|
|
pct->sec = ts.tv_sec;
|
|
pct->nsec = ts.tv_nsec;
|
|
pct++;
|
|
ptp->info->gettime64(ptp->info, &ts);
|
|
pct->sec = ts.tv_sec;
|
|
pct->nsec = ts.tv_nsec;
|
|
pct++;
|
|
}
|
|
getnstimeofday64(&ts);
|
|
pct->sec = ts.tv_sec;
|
|
pct->nsec = ts.tv_nsec;
|
|
if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case PTP_PIN_GETFUNC:
|
|
if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
pin_index = pd.index;
|
|
if (pin_index >= ops->n_pins) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
if (mutex_lock_interruptible(&ptp->pincfg_mux))
|
|
return -ERESTARTSYS;
|
|
pd = ops->pin_config[pin_index];
|
|
mutex_unlock(&ptp->pincfg_mux);
|
|
if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case PTP_PIN_SETFUNC:
|
|
if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
pin_index = pd.index;
|
|
if (pin_index >= ops->n_pins) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
if (mutex_lock_interruptible(&ptp->pincfg_mux))
|
|
return -ERESTARTSYS;
|
|
err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
|
|
mutex_unlock(&ptp->pincfg_mux);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
kfree(sysoff);
|
|
return err;
|
|
}
|
|
|
|
__poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
|
|
{
|
|
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
|
|
|
|
poll_wait(fp, &ptp->tsev_wq, wait);
|
|
|
|
return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0;
|
|
}
|
|
|
|
#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
|
|
|
|
ssize_t ptp_read(struct posix_clock *pc,
|
|
uint rdflags, char __user *buf, size_t cnt)
|
|
{
|
|
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
|
|
struct timestamp_event_queue *queue = &ptp->tsevq;
|
|
struct ptp_extts_event *event;
|
|
unsigned long flags;
|
|
size_t qcnt, i;
|
|
int result;
|
|
|
|
if (cnt % sizeof(struct ptp_extts_event) != 0)
|
|
return -EINVAL;
|
|
|
|
if (cnt > EXTTS_BUFSIZE)
|
|
cnt = EXTTS_BUFSIZE;
|
|
|
|
cnt = cnt / sizeof(struct ptp_extts_event);
|
|
|
|
if (mutex_lock_interruptible(&ptp->tsevq_mux))
|
|
return -ERESTARTSYS;
|
|
|
|
if (wait_event_interruptible(ptp->tsev_wq,
|
|
ptp->defunct || queue_cnt(queue))) {
|
|
mutex_unlock(&ptp->tsevq_mux);
|
|
return -ERESTARTSYS;
|
|
}
|
|
|
|
if (ptp->defunct) {
|
|
mutex_unlock(&ptp->tsevq_mux);
|
|
return -ENODEV;
|
|
}
|
|
|
|
event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
|
|
if (!event) {
|
|
mutex_unlock(&ptp->tsevq_mux);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_irqsave(&queue->lock, flags);
|
|
|
|
qcnt = queue_cnt(queue);
|
|
|
|
if (cnt > qcnt)
|
|
cnt = qcnt;
|
|
|
|
for (i = 0; i < cnt; i++) {
|
|
event[i] = queue->buf[queue->head];
|
|
queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&queue->lock, flags);
|
|
|
|
cnt = cnt * sizeof(struct ptp_extts_event);
|
|
|
|
mutex_unlock(&ptp->tsevq_mux);
|
|
|
|
result = cnt;
|
|
if (copy_to_user(buf, event, cnt))
|
|
result = -EFAULT;
|
|
|
|
kfree(event);
|
|
return result;
|
|
}
|