353 lines
8.6 KiB
C
353 lines
8.6 KiB
C
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/*
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* PTP 1588 clock support - sysfs interface.
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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/capability.h>
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#include <linux/slab.h>
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#include "ptp_private.h"
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static ssize_t clock_name_show(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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return snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name);
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}
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static DEVICE_ATTR(clock_name, 0444, clock_name_show, NULL);
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#define PTP_SHOW_INT(name, var) \
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static ssize_t var##_show(struct device *dev, \
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struct device_attribute *attr, char *page) \
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{ \
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struct ptp_clock *ptp = dev_get_drvdata(dev); \
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return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
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} \
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static DEVICE_ATTR(name, 0444, var##_show, NULL);
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PTP_SHOW_INT(max_adjustment, max_adj);
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PTP_SHOW_INT(n_alarms, n_alarm);
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PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
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PTP_SHOW_INT(n_periodic_outputs, n_per_out);
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PTP_SHOW_INT(n_programmable_pins, n_pins);
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PTP_SHOW_INT(pps_available, pps);
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static struct attribute *ptp_attrs[] = {
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&dev_attr_clock_name.attr,
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&dev_attr_max_adjustment.attr,
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&dev_attr_n_alarms.attr,
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&dev_attr_n_external_timestamps.attr,
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&dev_attr_n_periodic_outputs.attr,
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&dev_attr_n_programmable_pins.attr,
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&dev_attr_pps_available.attr,
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NULL,
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};
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static const struct attribute_group ptp_group = {
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.attrs = ptp_attrs,
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};
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const struct attribute_group *ptp_groups[] = {
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&ptp_group,
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NULL,
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};
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static ssize_t extts_enable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *ops = ptp->info;
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
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int cnt, enable;
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int err = -EINVAL;
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cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
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if (cnt != 2)
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goto out;
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if (req.extts.index >= ops->n_ext_ts)
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goto out;
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err = ops->enable(ops, &req, enable ? 1 : 0);
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if (err)
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goto out;
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return count;
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out:
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return err;
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}
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static ssize_t extts_fifo_show(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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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;
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int cnt = 0;
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memset(&event, 0, sizeof(event));
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if (mutex_lock_interruptible(&ptp->tsevq_mux))
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return -ERESTARTSYS;
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spin_lock_irqsave(&queue->lock, flags);
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qcnt = queue_cnt(queue);
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if (qcnt) {
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event = 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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if (!qcnt)
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goto out;
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cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
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event.index, event.t.sec, event.t.nsec);
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out:
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mutex_unlock(&ptp->tsevq_mux);
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return cnt;
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}
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static ssize_t period_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *ops = ptp->info;
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
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int cnt, enable, err = -EINVAL;
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cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
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&req.perout.start.sec, &req.perout.start.nsec,
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&req.perout.period.sec, &req.perout.period.nsec);
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if (cnt != 5)
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goto out;
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if (req.perout.index >= ops->n_per_out)
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goto out;
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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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if (err)
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goto out;
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return count;
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out:
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return err;
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}
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static ssize_t pps_enable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *ops = ptp->info;
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
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int cnt, enable;
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int err = -EINVAL;
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if (!capable(CAP_SYS_TIME))
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return -EPERM;
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cnt = sscanf(buf, "%d", &enable);
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if (cnt != 1)
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goto out;
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err = ops->enable(ops, &req, enable ? 1 : 0);
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if (err)
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goto out;
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return count;
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out:
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return err;
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}
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static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
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{
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int i;
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for (i = 0; i < ptp->info->n_pins; i++) {
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if (!strcmp(ptp->info->pin_config[i].name, name))
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return i;
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}
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return -1;
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}
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static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr,
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char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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unsigned int func, chan;
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int index;
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index = ptp_pin_name2index(ptp, attr->attr.name);
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if (index < 0)
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return -EINVAL;
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if (mutex_lock_interruptible(&ptp->pincfg_mux))
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return -ERESTARTSYS;
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func = ptp->info->pin_config[index].func;
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chan = ptp->info->pin_config[index].chan;
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mutex_unlock(&ptp->pincfg_mux);
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return snprintf(page, PAGE_SIZE, "%u %u\n", func, chan);
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}
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static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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unsigned int func, chan;
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int cnt, err, index;
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cnt = sscanf(buf, "%u %u", &func, &chan);
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if (cnt != 2)
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return -EINVAL;
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index = ptp_pin_name2index(ptp, attr->attr.name);
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if (index < 0)
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return -EINVAL;
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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, index, func, chan);
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mutex_unlock(&ptp->pincfg_mux);
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if (err)
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return err;
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return count;
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}
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static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
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static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
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static DEVICE_ATTR(period, 0220, NULL, period_store);
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static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
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int ptp_cleanup_sysfs(struct ptp_clock *ptp)
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{
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struct device *dev = ptp->dev;
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struct ptp_clock_info *info = ptp->info;
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if (info->n_ext_ts) {
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device_remove_file(dev, &dev_attr_extts_enable);
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device_remove_file(dev, &dev_attr_fifo);
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}
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if (info->n_per_out)
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device_remove_file(dev, &dev_attr_period);
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if (info->pps)
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device_remove_file(dev, &dev_attr_pps_enable);
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if (info->n_pins) {
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sysfs_remove_group(&dev->kobj, &ptp->pin_attr_group);
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kfree(ptp->pin_attr);
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kfree(ptp->pin_dev_attr);
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}
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return 0;
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}
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static int ptp_populate_pins(struct ptp_clock *ptp)
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{
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struct device *dev = ptp->dev;
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struct ptp_clock_info *info = ptp->info;
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int err = -ENOMEM, i, n_pins = info->n_pins;
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ptp->pin_dev_attr = kzalloc(n_pins * sizeof(*ptp->pin_dev_attr),
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GFP_KERNEL);
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if (!ptp->pin_dev_attr)
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goto no_dev_attr;
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ptp->pin_attr = kzalloc((1 + n_pins) * sizeof(struct attribute *),
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GFP_KERNEL);
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if (!ptp->pin_attr)
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goto no_pin_attr;
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for (i = 0; i < n_pins; i++) {
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struct device_attribute *da = &ptp->pin_dev_attr[i];
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sysfs_attr_init(&da->attr);
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da->attr.name = info->pin_config[i].name;
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da->attr.mode = 0644;
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da->show = ptp_pin_show;
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da->store = ptp_pin_store;
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ptp->pin_attr[i] = &da->attr;
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}
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ptp->pin_attr_group.name = "pins";
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ptp->pin_attr_group.attrs = ptp->pin_attr;
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err = sysfs_create_group(&dev->kobj, &ptp->pin_attr_group);
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if (err)
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goto no_group;
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return 0;
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no_group:
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kfree(ptp->pin_attr);
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no_pin_attr:
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kfree(ptp->pin_dev_attr);
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no_dev_attr:
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return err;
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}
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int ptp_populate_sysfs(struct ptp_clock *ptp)
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{
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struct device *dev = ptp->dev;
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struct ptp_clock_info *info = ptp->info;
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int err;
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if (info->n_ext_ts) {
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err = device_create_file(dev, &dev_attr_extts_enable);
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if (err)
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goto out1;
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err = device_create_file(dev, &dev_attr_fifo);
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if (err)
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goto out2;
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}
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if (info->n_per_out) {
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err = device_create_file(dev, &dev_attr_period);
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if (err)
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goto out3;
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}
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if (info->pps) {
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err = device_create_file(dev, &dev_attr_pps_enable);
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if (err)
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goto out4;
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}
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if (info->n_pins) {
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err = ptp_populate_pins(ptp);
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if (err)
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goto out5;
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}
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return 0;
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out5:
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if (info->pps)
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device_remove_file(dev, &dev_attr_pps_enable);
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out4:
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if (info->n_per_out)
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device_remove_file(dev, &dev_attr_period);
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out3:
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if (info->n_ext_ts)
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device_remove_file(dev, &dev_attr_fifo);
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out2:
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if (info->n_ext_ts)
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device_remove_file(dev, &dev_attr_extts_enable);
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out1:
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return err;
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}
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