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