2 * PTP 1588 clock support - character device implementation.
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/module.h>
21 #include <linux/posix-clock.h>
22 #include <linux/poll.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
26 #include "ptp_private.h"
28 static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
29 enum ptp_pin_function func, unsigned int chan)
31 struct ptp_clock_request rq;
34 memset(&rq, 0, sizeof(rq));
40 rq.type = PTP_CLK_REQ_EXTTS;
41 rq.extts.index = chan;
42 err = ops->enable(ops, &rq, 0);
45 rq.type = PTP_CLK_REQ_PEROUT;
46 rq.perout.index = chan;
47 err = ops->enable(ops, &rq, 0);
58 int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
59 enum ptp_pin_function func, unsigned int chan)
61 struct ptp_clock_info *info = ptp->info;
62 struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin];
65 /* Check to see if any other pin previously had this function. */
66 for (i = 0; i < info->n_pins; i++) {
67 if (info->pin_config[i].func == func &&
68 info->pin_config[i].chan == chan) {
69 pin1 = &info->pin_config[i];
76 /* Check the desired function and channel. */
81 if (chan >= info->n_ext_ts)
85 if (chan >= info->n_per_out)
89 pr_err("sorry, cannot reassign the calibration pin\n");
95 if (pin2->func == PTP_PF_PHYSYNC) {
96 pr_err("sorry, cannot reprogram the calibration pin\n");
100 if (info->verify(info, pin, func, chan)) {
101 pr_err("driver cannot use function %u on pin %u\n", func, chan);
105 /* Disable whatever function was previously assigned. */
107 ptp_disable_pinfunc(info, func, chan);
108 pin1->func = PTP_PF_NONE;
111 ptp_disable_pinfunc(info, pin2->func, pin2->chan);
118 int ptp_open(struct posix_clock *pc, fmode_t fmode)
123 long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
125 struct ptp_clock_caps caps;
126 struct ptp_clock_request req;
127 struct ptp_sys_offset *sysoff = NULL;
128 struct ptp_pin_desc pd;
129 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
130 struct ptp_clock_info *ops = ptp->info;
131 struct ptp_clock_time *pct;
134 unsigned int i, pin_index;
138 case PTP_CLOCK_GETCAPS:
139 memset(&caps, 0, sizeof(caps));
140 caps.max_adj = ptp->info->max_adj;
141 caps.n_alarm = ptp->info->n_alarm;
142 caps.n_ext_ts = ptp->info->n_ext_ts;
143 caps.n_per_out = ptp->info->n_per_out;
144 caps.pps = ptp->info->pps;
145 caps.n_pins = ptp->info->n_pins;
146 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
150 case PTP_EXTTS_REQUEST:
151 if (copy_from_user(&req.extts, (void __user *)arg,
152 sizeof(req.extts))) {
156 if (req.extts.index >= ops->n_ext_ts) {
160 req.type = PTP_CLK_REQ_EXTTS;
161 enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
162 err = ops->enable(ops, &req, enable);
165 case PTP_PEROUT_REQUEST:
166 if (copy_from_user(&req.perout, (void __user *)arg,
167 sizeof(req.perout))) {
171 if (req.perout.index >= ops->n_per_out) {
175 req.type = PTP_CLK_REQ_PEROUT;
176 enable = req.perout.period.sec || req.perout.period.nsec;
177 err = ops->enable(ops, &req, enable);
181 if (!capable(CAP_SYS_TIME))
183 req.type = PTP_CLK_REQ_PPS;
184 enable = arg ? 1 : 0;
185 err = ops->enable(ops, &req, enable);
189 sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL);
194 if (copy_from_user(sysoff, (void __user *)arg,
199 if (sysoff->n_samples > PTP_MAX_SAMPLES) {
203 pct = &sysoff->ts[0];
204 for (i = 0; i < sysoff->n_samples; i++) {
206 pct->sec = ts.tv_sec;
207 pct->nsec = ts.tv_nsec;
209 ptp->info->gettime(ptp->info, &ts);
210 pct->sec = ts.tv_sec;
211 pct->nsec = ts.tv_nsec;
215 pct->sec = ts.tv_sec;
216 pct->nsec = ts.tv_nsec;
217 if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
221 case PTP_PIN_GETFUNC:
222 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
226 pin_index = pd.index;
227 if (pin_index >= ops->n_pins) {
231 if (mutex_lock_interruptible(&ptp->pincfg_mux))
233 pd = ops->pin_config[pin_index];
234 mutex_unlock(&ptp->pincfg_mux);
235 if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
239 case PTP_PIN_SETFUNC:
240 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
244 pin_index = pd.index;
245 if (pin_index >= ops->n_pins) {
249 if (mutex_lock_interruptible(&ptp->pincfg_mux))
251 err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
252 mutex_unlock(&ptp->pincfg_mux);
264 unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
266 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
268 poll_wait(fp, &ptp->tsev_wq, wait);
270 return queue_cnt(&ptp->tsevq) ? POLLIN : 0;
273 #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
275 ssize_t ptp_read(struct posix_clock *pc,
276 uint rdflags, char __user *buf, size_t cnt)
278 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
279 struct timestamp_event_queue *queue = &ptp->tsevq;
280 struct ptp_extts_event *event;
285 if (cnt % sizeof(struct ptp_extts_event) != 0)
288 if (cnt > EXTTS_BUFSIZE)
291 cnt = cnt / sizeof(struct ptp_extts_event);
293 if (mutex_lock_interruptible(&ptp->tsevq_mux))
296 if (wait_event_interruptible(ptp->tsev_wq,
297 ptp->defunct || queue_cnt(queue))) {
298 mutex_unlock(&ptp->tsevq_mux);
303 mutex_unlock(&ptp->tsevq_mux);
307 event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
309 mutex_unlock(&ptp->tsevq_mux);
313 spin_lock_irqsave(&queue->lock, flags);
315 qcnt = queue_cnt(queue);
320 for (i = 0; i < cnt; i++) {
321 event[i] = queue->buf[queue->head];
322 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
325 spin_unlock_irqrestore(&queue->lock, flags);
327 cnt = cnt * sizeof(struct ptp_extts_event);
329 mutex_unlock(&ptp->tsevq_mux);
332 if (copy_to_user(buf, event, cnt))