/* * 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 <linux/nospec.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; break; 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++) { ktime_get_real_ts64(&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++; } ktime_get_real_ts64(&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; } pin_index = array_index_nospec(pin_index, ops->n_pins); 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; } pin_index = array_index_nospec(pin_index, ops->n_pins); 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; }