2 * PTP 1588 clock support - sysfs interface.
4 * Copyright (C) 2010 OMICRON electronics GmbH
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include <linux/capability.h>
21 #include <linux/slab.h>
23 #include "ptp_private.h"
25 static ssize_t clock_name_show(struct device *dev,
26 struct device_attribute *attr, char *page)
28 struct ptp_clock *ptp = dev_get_drvdata(dev);
29 return sysfs_emit(page, "%s\n", ptp->info->name);
31 static DEVICE_ATTR_RO(clock_name);
33 #define PTP_SHOW_INT(name, var) \
34 static ssize_t var##_show(struct device *dev, \
35 struct device_attribute *attr, char *page) \
37 struct ptp_clock *ptp = dev_get_drvdata(dev); \
38 return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
40 static DEVICE_ATTR(name, 0444, var##_show, NULL);
42 PTP_SHOW_INT(max_adjustment, max_adj);
43 PTP_SHOW_INT(n_alarms, n_alarm);
44 PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
45 PTP_SHOW_INT(n_periodic_outputs, n_per_out);
46 PTP_SHOW_INT(n_programmable_pins, n_pins);
47 PTP_SHOW_INT(pps_available, pps);
49 static ssize_t extts_enable_store(struct device *dev,
50 struct device_attribute *attr,
51 const char *buf, size_t count)
53 struct ptp_clock *ptp = dev_get_drvdata(dev);
54 struct ptp_clock_info *ops = ptp->info;
55 struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
59 cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
62 if (req.extts.index >= ops->n_ext_ts)
65 err = ops->enable(ops, &req, enable ? 1 : 0);
73 static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
75 static ssize_t extts_fifo_show(struct device *dev,
76 struct device_attribute *attr, char *page)
78 struct ptp_clock *ptp = dev_get_drvdata(dev);
79 struct timestamp_event_queue *queue = &ptp->tsevq;
80 struct ptp_extts_event event;
85 memset(&event, 0, sizeof(event));
87 if (mutex_lock_interruptible(&ptp->tsevq_mux))
90 spin_lock_irqsave(&queue->lock, flags);
91 qcnt = queue_cnt(queue);
93 event = queue->buf[queue->head];
94 /* Paired with READ_ONCE() in queue_cnt() */
95 WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS);
97 spin_unlock_irqrestore(&queue->lock, flags);
102 cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
103 event.index, event.t.sec, event.t.nsec);
105 mutex_unlock(&ptp->tsevq_mux);
108 static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
110 static ssize_t period_store(struct device *dev,
111 struct device_attribute *attr,
112 const char *buf, size_t count)
114 struct ptp_clock *ptp = dev_get_drvdata(dev);
115 struct ptp_clock_info *ops = ptp->info;
116 struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
117 int cnt, enable, err = -EINVAL;
119 cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
120 &req.perout.start.sec, &req.perout.start.nsec,
121 &req.perout.period.sec, &req.perout.period.nsec);
124 if (req.perout.index >= ops->n_per_out)
127 enable = req.perout.period.sec || req.perout.period.nsec;
128 err = ops->enable(ops, &req, enable);
136 static DEVICE_ATTR(period, 0220, NULL, period_store);
138 static ssize_t pps_enable_store(struct device *dev,
139 struct device_attribute *attr,
140 const char *buf, size_t count)
142 struct ptp_clock *ptp = dev_get_drvdata(dev);
143 struct ptp_clock_info *ops = ptp->info;
144 struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
148 if (!capable(CAP_SYS_TIME))
151 cnt = sscanf(buf, "%d", &enable);
155 err = ops->enable(ops, &req, enable ? 1 : 0);
163 static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
165 static struct attribute *ptp_attrs[] = {
166 &dev_attr_clock_name.attr,
168 &dev_attr_max_adjustment.attr,
169 &dev_attr_n_alarms.attr,
170 &dev_attr_n_external_timestamps.attr,
171 &dev_attr_n_periodic_outputs.attr,
172 &dev_attr_n_programmable_pins.attr,
173 &dev_attr_pps_available.attr,
175 &dev_attr_extts_enable.attr,
177 &dev_attr_period.attr,
178 &dev_attr_pps_enable.attr,
182 static umode_t ptp_is_attribute_visible(struct kobject *kobj,
183 struct attribute *attr, int n)
185 struct device *dev = kobj_to_dev(kobj);
186 struct ptp_clock *ptp = dev_get_drvdata(dev);
187 struct ptp_clock_info *info = ptp->info;
188 umode_t mode = attr->mode;
190 if (attr == &dev_attr_extts_enable.attr ||
191 attr == &dev_attr_fifo.attr) {
194 } else if (attr == &dev_attr_period.attr) {
195 if (!info->n_per_out)
197 } else if (attr == &dev_attr_pps_enable.attr) {
205 static const struct attribute_group ptp_group = {
206 .is_visible = ptp_is_attribute_visible,
210 const struct attribute_group *ptp_groups[] = {
215 static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
218 for (i = 0; i < ptp->info->n_pins; i++) {
219 if (!strcmp(ptp->info->pin_config[i].name, name))
225 static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr,
228 struct ptp_clock *ptp = dev_get_drvdata(dev);
229 unsigned int func, chan;
232 index = ptp_pin_name2index(ptp, attr->attr.name);
236 if (mutex_lock_interruptible(&ptp->pincfg_mux))
239 func = ptp->info->pin_config[index].func;
240 chan = ptp->info->pin_config[index].chan;
242 mutex_unlock(&ptp->pincfg_mux);
244 return sysfs_emit(page, "%u %u\n", func, chan);
247 static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
248 const char *buf, size_t count)
250 struct ptp_clock *ptp = dev_get_drvdata(dev);
251 unsigned int func, chan;
254 cnt = sscanf(buf, "%u %u", &func, &chan);
258 index = ptp_pin_name2index(ptp, attr->attr.name);
262 if (mutex_lock_interruptible(&ptp->pincfg_mux))
264 err = ptp_set_pinfunc(ptp, index, func, chan);
265 mutex_unlock(&ptp->pincfg_mux);
272 int ptp_populate_pin_groups(struct ptp_clock *ptp)
274 struct ptp_clock_info *info = ptp->info;
275 int err = -ENOMEM, i, n_pins = info->n_pins;
280 ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr),
282 if (!ptp->pin_dev_attr)
285 ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL);
289 for (i = 0; i < n_pins; i++) {
290 struct device_attribute *da = &ptp->pin_dev_attr[i];
291 sysfs_attr_init(&da->attr);
292 da->attr.name = info->pin_config[i].name;
293 da->attr.mode = 0644;
294 da->show = ptp_pin_show;
295 da->store = ptp_pin_store;
296 ptp->pin_attr[i] = &da->attr;
299 ptp->pin_attr_group.name = "pins";
300 ptp->pin_attr_group.attrs = ptp->pin_attr;
302 ptp->pin_attr_groups[0] = &ptp->pin_attr_group;
307 kfree(ptp->pin_dev_attr);
312 void ptp_cleanup_pin_groups(struct ptp_clock *ptp)
314 kfree(ptp->pin_attr);
315 kfree(ptp->pin_dev_attr);