1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * PTP 1588 clock support - character device implementation.
5 * Copyright (C) 2010 OMICRON electronics GmbH
7 #include <linux/module.h>
8 #include <linux/posix-clock.h>
9 #include <linux/poll.h>
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/timekeeping.h>
14 #include <linux/nospec.h>
16 #include "ptp_private.h"
18 static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
19 enum ptp_pin_function func, unsigned int chan)
21 struct ptp_clock_request rq;
24 memset(&rq, 0, sizeof(rq));
30 rq.type = PTP_CLK_REQ_EXTTS;
31 rq.extts.index = chan;
32 err = ops->enable(ops, &rq, 0);
35 rq.type = PTP_CLK_REQ_PEROUT;
36 rq.perout.index = chan;
37 err = ops->enable(ops, &rq, 0);
48 int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
49 enum ptp_pin_function func, unsigned int chan)
51 struct ptp_clock_info *info = ptp->info;
52 struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin];
55 /* Check to see if any other pin previously had this function. */
56 for (i = 0; i < info->n_pins; i++) {
57 if (info->pin_config[i].func == func &&
58 info->pin_config[i].chan == chan) {
59 pin1 = &info->pin_config[i];
66 /* Check the desired function and channel. */
71 if (chan >= info->n_ext_ts)
75 if (chan >= info->n_per_out)
86 if (info->verify(info, pin, func, chan)) {
87 pr_err("driver cannot use function %u on pin %u\n", func, chan);
91 /* Disable whatever function was previously assigned. */
93 ptp_disable_pinfunc(info, func, chan);
94 pin1->func = PTP_PF_NONE;
97 ptp_disable_pinfunc(info, pin2->func, pin2->chan);
104 int ptp_open(struct posix_clock *pc, fmode_t fmode)
109 long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
111 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
112 struct ptp_sys_offset_extended *extoff = NULL;
113 struct ptp_sys_offset_precise precise_offset;
114 struct system_device_crosststamp xtstamp;
115 struct ptp_clock_info *ops = ptp->info;
116 struct ptp_sys_offset *sysoff = NULL;
117 struct ptp_system_timestamp sts;
118 struct ptp_clock_request req;
119 struct ptp_clock_caps caps;
120 struct ptp_clock_time *pct;
121 unsigned int i, pin_index;
122 struct ptp_pin_desc pd;
123 struct timespec64 ts;
128 case PTP_CLOCK_GETCAPS:
129 case PTP_CLOCK_GETCAPS2:
130 memset(&caps, 0, sizeof(caps));
132 caps.max_adj = ptp->info->max_adj;
133 caps.n_alarm = ptp->info->n_alarm;
134 caps.n_ext_ts = ptp->info->n_ext_ts;
135 caps.n_per_out = ptp->info->n_per_out;
136 caps.pps = ptp->info->pps;
137 caps.n_pins = ptp->info->n_pins;
138 caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
139 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
143 case PTP_EXTTS_REQUEST:
144 case PTP_EXTTS_REQUEST2:
145 memset(&req, 0, sizeof(req));
147 if (copy_from_user(&req.extts, (void __user *)arg,
148 sizeof(req.extts))) {
152 if (((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) ||
153 req.extts.rsv[0] || req.extts.rsv[1]) &&
154 cmd == PTP_EXTTS_REQUEST2) {
157 } else if (cmd == PTP_EXTTS_REQUEST) {
158 req.extts.flags &= ~PTP_EXTTS_VALID_FLAGS;
159 req.extts.rsv[0] = 0;
160 req.extts.rsv[1] = 0;
162 if (req.extts.index >= ops->n_ext_ts) {
166 req.type = PTP_CLK_REQ_EXTTS;
167 enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
168 err = ops->enable(ops, &req, enable);
171 case PTP_PEROUT_REQUEST:
172 case PTP_PEROUT_REQUEST2:
173 memset(&req, 0, sizeof(req));
175 if (copy_from_user(&req.perout, (void __user *)arg,
176 sizeof(req.perout))) {
180 if (((req.perout.flags & ~PTP_PEROUT_VALID_FLAGS) ||
181 req.perout.rsv[0] || req.perout.rsv[1] ||
182 req.perout.rsv[2] || req.perout.rsv[3]) &&
183 cmd == PTP_PEROUT_REQUEST2) {
186 } else if (cmd == PTP_PEROUT_REQUEST) {
187 req.perout.flags &= ~PTP_PEROUT_VALID_FLAGS;
188 req.perout.rsv[0] = 0;
189 req.perout.rsv[1] = 0;
190 req.perout.rsv[2] = 0;
191 req.perout.rsv[3] = 0;
193 if (req.perout.index >= ops->n_per_out) {
197 req.type = PTP_CLK_REQ_PEROUT;
198 enable = req.perout.period.sec || req.perout.period.nsec;
199 err = ops->enable(ops, &req, enable);
203 case PTP_ENABLE_PPS2:
204 memset(&req, 0, sizeof(req));
206 if (!capable(CAP_SYS_TIME))
208 req.type = PTP_CLK_REQ_PPS;
209 enable = arg ? 1 : 0;
210 err = ops->enable(ops, &req, enable);
213 case PTP_SYS_OFFSET_PRECISE:
214 case PTP_SYS_OFFSET_PRECISE2:
215 if (!ptp->info->getcrosststamp) {
219 err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
223 memset(&precise_offset, 0, sizeof(precise_offset));
224 ts = ktime_to_timespec64(xtstamp.device);
225 precise_offset.device.sec = ts.tv_sec;
226 precise_offset.device.nsec = ts.tv_nsec;
227 ts = ktime_to_timespec64(xtstamp.sys_realtime);
228 precise_offset.sys_realtime.sec = ts.tv_sec;
229 precise_offset.sys_realtime.nsec = ts.tv_nsec;
230 ts = ktime_to_timespec64(xtstamp.sys_monoraw);
231 precise_offset.sys_monoraw.sec = ts.tv_sec;
232 precise_offset.sys_monoraw.nsec = ts.tv_nsec;
233 if (copy_to_user((void __user *)arg, &precise_offset,
234 sizeof(precise_offset)))
238 case PTP_SYS_OFFSET_EXTENDED:
239 case PTP_SYS_OFFSET_EXTENDED2:
240 if (!ptp->info->gettimex64) {
244 extoff = memdup_user((void __user *)arg, sizeof(*extoff));
245 if (IS_ERR(extoff)) {
246 err = PTR_ERR(extoff);
250 if (extoff->n_samples > PTP_MAX_SAMPLES
251 || extoff->rsv[0] || extoff->rsv[1] || extoff->rsv[2]) {
255 for (i = 0; i < extoff->n_samples; i++) {
256 err = ptp->info->gettimex64(ptp->info, &ts, &sts);
259 extoff->ts[i][0].sec = sts.pre_ts.tv_sec;
260 extoff->ts[i][0].nsec = sts.pre_ts.tv_nsec;
261 extoff->ts[i][1].sec = ts.tv_sec;
262 extoff->ts[i][1].nsec = ts.tv_nsec;
263 extoff->ts[i][2].sec = sts.post_ts.tv_sec;
264 extoff->ts[i][2].nsec = sts.post_ts.tv_nsec;
266 if (copy_to_user((void __user *)arg, extoff, sizeof(*extoff)))
271 case PTP_SYS_OFFSET2:
272 sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
273 if (IS_ERR(sysoff)) {
274 err = PTR_ERR(sysoff);
278 if (sysoff->n_samples > PTP_MAX_SAMPLES) {
282 pct = &sysoff->ts[0];
283 for (i = 0; i < sysoff->n_samples; i++) {
284 ktime_get_real_ts64(&ts);
285 pct->sec = ts.tv_sec;
286 pct->nsec = ts.tv_nsec;
289 err = ops->gettimex64(ops, &ts, NULL);
291 err = ops->gettime64(ops, &ts);
294 pct->sec = ts.tv_sec;
295 pct->nsec = ts.tv_nsec;
298 ktime_get_real_ts64(&ts);
299 pct->sec = ts.tv_sec;
300 pct->nsec = ts.tv_nsec;
301 if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
305 case PTP_PIN_GETFUNC:
306 case PTP_PIN_GETFUNC2:
307 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
311 if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
312 || pd.rsv[3] || pd.rsv[4])
313 && cmd == PTP_PIN_GETFUNC2) {
316 } else if (cmd == PTP_PIN_GETFUNC) {
323 pin_index = pd.index;
324 if (pin_index >= ops->n_pins) {
328 pin_index = array_index_nospec(pin_index, ops->n_pins);
329 if (mutex_lock_interruptible(&ptp->pincfg_mux))
331 pd = ops->pin_config[pin_index];
332 mutex_unlock(&ptp->pincfg_mux);
333 if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
337 case PTP_PIN_SETFUNC:
338 case PTP_PIN_SETFUNC2:
339 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
343 if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
344 || pd.rsv[3] || pd.rsv[4])
345 && cmd == PTP_PIN_SETFUNC2) {
348 } else if (cmd == PTP_PIN_SETFUNC) {
355 pin_index = pd.index;
356 if (pin_index >= ops->n_pins) {
360 pin_index = array_index_nospec(pin_index, ops->n_pins);
361 if (mutex_lock_interruptible(&ptp->pincfg_mux))
363 err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
364 mutex_unlock(&ptp->pincfg_mux);
378 __poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
380 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
382 poll_wait(fp, &ptp->tsev_wq, wait);
384 return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0;
387 #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
389 ssize_t ptp_read(struct posix_clock *pc,
390 uint rdflags, char __user *buf, size_t cnt)
392 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
393 struct timestamp_event_queue *queue = &ptp->tsevq;
394 struct ptp_extts_event *event;
399 if (cnt % sizeof(struct ptp_extts_event) != 0)
402 if (cnt > EXTTS_BUFSIZE)
405 cnt = cnt / sizeof(struct ptp_extts_event);
407 if (mutex_lock_interruptible(&ptp->tsevq_mux))
410 if (wait_event_interruptible(ptp->tsev_wq,
411 ptp->defunct || queue_cnt(queue))) {
412 mutex_unlock(&ptp->tsevq_mux);
417 mutex_unlock(&ptp->tsevq_mux);
421 event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
423 mutex_unlock(&ptp->tsevq_mux);
427 spin_lock_irqsave(&queue->lock, flags);
429 qcnt = queue_cnt(queue);
434 for (i = 0; i < cnt; i++) {
435 event[i] = queue->buf[queue->head];
436 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
439 spin_unlock_irqrestore(&queue->lock, flags);
441 cnt = cnt * sizeof(struct ptp_extts_event);
443 mutex_unlock(&ptp->tsevq_mux);
446 if (copy_to_user(buf, event, cnt))