--- /dev/null
+/*
+ * 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 "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_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;
+ 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;
+ 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:
+ sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL);
+ if (!sysoff) {
+ err = -ENOMEM;
+ break;
+ }
+ if (copy_from_user(sysoff, (void __user *)arg,
+ sizeof(*sysoff))) {
+ err = -EFAULT;
+ 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;
+}
+
+unsigned int 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) ? POLLIN : 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;
+}
Code Review / kvmfornfv.git / blobdiff