401 lines
9.6 KiB
C
401 lines
9.6 KiB
C
/*
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* PTP 1588 clock support - character device implementation.
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*
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* Copyright (C) 2010 OMICRON electronics GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/posix-clock.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/timekeeping.h>
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#include <linux/nospec.h>
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#include "ptp_private.h"
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static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
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enum ptp_pin_function func, unsigned int chan)
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{
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struct ptp_clock_request rq;
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int err = 0;
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memset(&rq, 0, sizeof(rq));
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switch (func) {
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case PTP_PF_NONE:
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break;
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case PTP_PF_EXTTS:
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rq.type = PTP_CLK_REQ_EXTTS;
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rq.extts.index = chan;
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err = ops->enable(ops, &rq, 0);
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break;
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case PTP_PF_PEROUT:
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rq.type = PTP_CLK_REQ_PEROUT;
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rq.perout.index = chan;
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err = ops->enable(ops, &rq, 0);
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break;
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case PTP_PF_PHYSYNC:
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break;
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default:
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return -EINVAL;
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}
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return err;
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}
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int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
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enum ptp_pin_function func, unsigned int chan)
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{
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struct ptp_clock_info *info = ptp->info;
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struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin];
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unsigned int i;
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/* Check to see if any other pin previously had this function. */
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for (i = 0; i < info->n_pins; i++) {
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if (info->pin_config[i].func == func &&
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info->pin_config[i].chan == chan) {
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pin1 = &info->pin_config[i];
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break;
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}
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}
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if (pin1 && i == pin)
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return 0;
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/* Check the desired function and channel. */
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switch (func) {
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case PTP_PF_NONE:
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break;
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case PTP_PF_EXTTS:
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if (chan >= info->n_ext_ts)
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return -EINVAL;
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break;
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case PTP_PF_PEROUT:
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if (chan >= info->n_per_out)
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return -EINVAL;
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break;
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case PTP_PF_PHYSYNC:
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if (chan != 0)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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if (info->verify(info, pin, func, chan)) {
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pr_err("driver cannot use function %u on pin %u\n", func, chan);
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return -EOPNOTSUPP;
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}
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/* Disable whatever function was previously assigned. */
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if (pin1) {
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ptp_disable_pinfunc(info, func, chan);
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pin1->func = PTP_PF_NONE;
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pin1->chan = 0;
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}
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ptp_disable_pinfunc(info, pin2->func, pin2->chan);
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pin2->func = func;
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pin2->chan = chan;
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return 0;
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}
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int ptp_open(struct posix_clock *pc, fmode_t fmode)
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{
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return 0;
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}
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long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
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{
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struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
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struct ptp_sys_offset_extended *extoff = NULL;
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struct ptp_sys_offset_precise precise_offset;
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struct system_device_crosststamp xtstamp;
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struct ptp_clock_info *ops = ptp->info;
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struct ptp_sys_offset *sysoff = NULL;
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struct ptp_system_timestamp sts;
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struct ptp_clock_request req;
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struct ptp_clock_caps caps;
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struct ptp_clock_time *pct;
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unsigned int i, pin_index;
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struct ptp_pin_desc pd;
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struct timespec64 ts;
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int enable, err = 0;
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switch (cmd) {
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case PTP_CLOCK_GETCAPS:
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memset(&caps, 0, sizeof(caps));
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caps.max_adj = ptp->info->max_adj;
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caps.n_alarm = ptp->info->n_alarm;
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caps.n_ext_ts = ptp->info->n_ext_ts;
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caps.n_per_out = ptp->info->n_per_out;
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caps.pps = ptp->info->pps;
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caps.n_pins = ptp->info->n_pins;
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caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
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if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
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err = -EFAULT;
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break;
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case PTP_EXTTS_REQUEST:
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if (copy_from_user(&req.extts, (void __user *)arg,
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sizeof(req.extts))) {
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err = -EFAULT;
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break;
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}
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if (req.extts.index >= ops->n_ext_ts) {
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err = -EINVAL;
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break;
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}
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req.type = PTP_CLK_REQ_EXTTS;
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enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
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err = ops->enable(ops, &req, enable);
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break;
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case PTP_PEROUT_REQUEST:
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if (copy_from_user(&req.perout, (void __user *)arg,
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sizeof(req.perout))) {
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err = -EFAULT;
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break;
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}
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if (req.perout.index >= ops->n_per_out) {
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err = -EINVAL;
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break;
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}
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req.type = PTP_CLK_REQ_PEROUT;
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enable = req.perout.period.sec || req.perout.period.nsec;
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err = ops->enable(ops, &req, enable);
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break;
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case PTP_ENABLE_PPS:
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if (!capable(CAP_SYS_TIME))
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return -EPERM;
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req.type = PTP_CLK_REQ_PPS;
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enable = arg ? 1 : 0;
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err = ops->enable(ops, &req, enable);
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break;
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case PTP_SYS_OFFSET_PRECISE:
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if (!ptp->info->getcrosststamp) {
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err = -EOPNOTSUPP;
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break;
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}
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err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
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if (err)
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break;
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memset(&precise_offset, 0, sizeof(precise_offset));
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ts = ktime_to_timespec64(xtstamp.device);
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precise_offset.device.sec = ts.tv_sec;
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precise_offset.device.nsec = ts.tv_nsec;
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ts = ktime_to_timespec64(xtstamp.sys_realtime);
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precise_offset.sys_realtime.sec = ts.tv_sec;
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precise_offset.sys_realtime.nsec = ts.tv_nsec;
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ts = ktime_to_timespec64(xtstamp.sys_monoraw);
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precise_offset.sys_monoraw.sec = ts.tv_sec;
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precise_offset.sys_monoraw.nsec = ts.tv_nsec;
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if (copy_to_user((void __user *)arg, &precise_offset,
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sizeof(precise_offset)))
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err = -EFAULT;
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break;
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case PTP_SYS_OFFSET_EXTENDED:
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if (!ptp->info->gettimex64) {
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err = -EOPNOTSUPP;
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break;
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}
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extoff = memdup_user((void __user *)arg, sizeof(*extoff));
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if (IS_ERR(extoff)) {
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err = PTR_ERR(extoff);
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extoff = NULL;
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break;
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}
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if (extoff->n_samples > PTP_MAX_SAMPLES) {
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err = -EINVAL;
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break;
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}
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for (i = 0; i < extoff->n_samples; i++) {
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err = ptp->info->gettimex64(ptp->info, &ts, &sts);
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if (err)
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goto out;
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extoff->ts[i][0].sec = sts.pre_ts.tv_sec;
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extoff->ts[i][0].nsec = sts.pre_ts.tv_nsec;
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extoff->ts[i][1].sec = ts.tv_sec;
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extoff->ts[i][1].nsec = ts.tv_nsec;
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extoff->ts[i][2].sec = sts.post_ts.tv_sec;
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extoff->ts[i][2].nsec = sts.post_ts.tv_nsec;
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}
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if (copy_to_user((void __user *)arg, extoff, sizeof(*extoff)))
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err = -EFAULT;
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break;
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case PTP_SYS_OFFSET:
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sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
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if (IS_ERR(sysoff)) {
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err = PTR_ERR(sysoff);
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sysoff = NULL;
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break;
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}
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if (sysoff->n_samples > PTP_MAX_SAMPLES) {
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err = -EINVAL;
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break;
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}
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pct = &sysoff->ts[0];
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for (i = 0; i < sysoff->n_samples; i++) {
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ktime_get_real_ts64(&ts);
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pct->sec = ts.tv_sec;
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pct->nsec = ts.tv_nsec;
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pct++;
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if (ops->gettimex64)
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err = ops->gettimex64(ops, &ts, NULL);
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else
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err = ops->gettime64(ops, &ts);
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if (err)
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goto out;
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pct->sec = ts.tv_sec;
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pct->nsec = ts.tv_nsec;
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pct++;
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}
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ktime_get_real_ts64(&ts);
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pct->sec = ts.tv_sec;
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pct->nsec = ts.tv_nsec;
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if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
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err = -EFAULT;
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break;
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case PTP_PIN_GETFUNC:
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if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
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err = -EFAULT;
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break;
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}
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pin_index = pd.index;
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if (pin_index >= ops->n_pins) {
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err = -EINVAL;
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break;
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}
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pin_index = array_index_nospec(pin_index, ops->n_pins);
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if (mutex_lock_interruptible(&ptp->pincfg_mux))
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return -ERESTARTSYS;
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pd = ops->pin_config[pin_index];
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mutex_unlock(&ptp->pincfg_mux);
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if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
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err = -EFAULT;
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break;
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case PTP_PIN_SETFUNC:
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if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
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err = -EFAULT;
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break;
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}
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pin_index = pd.index;
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if (pin_index >= ops->n_pins) {
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err = -EINVAL;
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break;
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}
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pin_index = array_index_nospec(pin_index, ops->n_pins);
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if (mutex_lock_interruptible(&ptp->pincfg_mux))
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return -ERESTARTSYS;
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err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
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mutex_unlock(&ptp->pincfg_mux);
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break;
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default:
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err = -ENOTTY;
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break;
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}
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out:
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kfree(extoff);
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kfree(sysoff);
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return err;
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}
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__poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
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{
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struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
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poll_wait(fp, &ptp->tsev_wq, wait);
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return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0;
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}
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#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
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ssize_t ptp_read(struct posix_clock *pc,
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uint rdflags, char __user *buf, size_t cnt)
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{
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struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
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struct timestamp_event_queue *queue = &ptp->tsevq;
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struct ptp_extts_event *event;
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unsigned long flags;
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size_t qcnt, i;
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int result;
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if (cnt % sizeof(struct ptp_extts_event) != 0)
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return -EINVAL;
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if (cnt > EXTTS_BUFSIZE)
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cnt = EXTTS_BUFSIZE;
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cnt = cnt / sizeof(struct ptp_extts_event);
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if (mutex_lock_interruptible(&ptp->tsevq_mux))
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return -ERESTARTSYS;
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if (wait_event_interruptible(ptp->tsev_wq,
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ptp->defunct || queue_cnt(queue))) {
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mutex_unlock(&ptp->tsevq_mux);
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return -ERESTARTSYS;
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}
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if (ptp->defunct) {
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mutex_unlock(&ptp->tsevq_mux);
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return -ENODEV;
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}
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event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
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if (!event) {
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mutex_unlock(&ptp->tsevq_mux);
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return -ENOMEM;
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}
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spin_lock_irqsave(&queue->lock, flags);
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qcnt = queue_cnt(queue);
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if (cnt > qcnt)
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cnt = qcnt;
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for (i = 0; i < cnt; i++) {
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event[i] = queue->buf[queue->head];
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queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
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}
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spin_unlock_irqrestore(&queue->lock, flags);
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cnt = cnt * sizeof(struct ptp_extts_event);
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mutex_unlock(&ptp->tsevq_mux);
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result = cnt;
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if (copy_to_user(buf, event, cnt))
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result = -EFAULT;
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kfree(event);
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return result;
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}
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