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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PTP 1588 clock support - character device implementation.
4 *
5 * Copyright (C) 2010 OMICRON electronics GmbH
6 */
7#include <linux/compat.h>
8#include <linux/module.h>
9#include <linux/posix-clock.h>
10#include <linux/poll.h>
11#include <linux/sched.h>
12#include <linux/slab.h>
13#include <linux/timekeeping.h>
14#include <linux/debugfs.h>
15
16#include <linux/nospec.h>
17
18#include "ptp_private.h"
19
20static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
21 enum ptp_pin_function func, unsigned int chan)
22{
23 struct ptp_clock_request rq;
24 int err = 0;
25
26 memset(&rq, 0, sizeof(rq));
27
28 switch (func) {
29 case PTP_PF_NONE:
30 break;
31 case PTP_PF_EXTTS:
32 rq.type = PTP_CLK_REQ_EXTTS;
33 rq.extts.index = chan;
34 err = ops->enable(ops, &rq, 0);
35 break;
36 case PTP_PF_PEROUT:
37 rq.type = PTP_CLK_REQ_PEROUT;
38 rq.perout.index = chan;
39 err = ops->enable(ops, &rq, 0);
40 break;
41 case PTP_PF_PHYSYNC:
42 break;
43 default:
44 return -EINVAL;
45 }
46
47 return err;
48}
49
50int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
51 enum ptp_pin_function func, unsigned int chan)
52{
53 struct ptp_clock_info *info = ptp->info;
54 struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin];
55 unsigned int i;
56
57 /* Check to see if any other pin previously had this function. */
58 for (i = 0; i < info->n_pins; i++) {
59 if (info->pin_config[i].func == func &&
60 info->pin_config[i].chan == chan) {
61 pin1 = &info->pin_config[i];
62 break;
63 }
64 }
65 if (pin1 && i == pin)
66 return 0;
67
68 /* Check the desired function and channel. */
69 switch (func) {
70 case PTP_PF_NONE:
71 break;
72 case PTP_PF_EXTTS:
73 if (chan >= info->n_ext_ts)
74 return -EINVAL;
75 break;
76 case PTP_PF_PEROUT:
77 if (chan >= info->n_per_out)
78 return -EINVAL;
79 break;
80 case PTP_PF_PHYSYNC:
81 if (chan != 0)
82 return -EINVAL;
83 break;
84 default:
85 return -EINVAL;
86 }
87
88 if (info->verify(info, pin, func, chan)) {
89 pr_err("driver cannot use function %u and channel %u on pin %u\n",
90 func, chan, pin);
91 return -EOPNOTSUPP;
92 }
93
94 /* Disable whatever function was previously assigned. */
95 if (pin1) {
96 ptp_disable_pinfunc(info, func, chan);
97 pin1->func = PTP_PF_NONE;
98 pin1->chan = 0;
99 }
100 ptp_disable_pinfunc(info, pin2->func, pin2->chan);
101 pin2->func = func;
102 pin2->chan = chan;
103
104 return 0;
105}
106
107int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode)
108{
109 struct ptp_clock *ptp =
110 container_of(pccontext->clk, struct ptp_clock, clock);
111 struct timestamp_event_queue *queue;
112 char debugfsname[32];
113 unsigned long flags;
114
115 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
116 if (!queue)
117 return -EINVAL;
118 queue->mask = bitmap_alloc(PTP_MAX_CHANNELS, GFP_KERNEL);
119 if (!queue->mask) {
120 kfree(queue);
121 return -EINVAL;
122 }
123 bitmap_set(queue->mask, 0, PTP_MAX_CHANNELS);
124 spin_lock_init(&queue->lock);
125 spin_lock_irqsave(&ptp->tsevqs_lock, flags);
126 list_add_tail(&queue->qlist, &ptp->tsevqs);
127 spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
128 pccontext->private_clkdata = queue;
129
130 /* Debugfs contents */
131 sprintf(debugfsname, "0x%p", queue);
132 queue->debugfs_instance =
133 debugfs_create_dir(debugfsname, ptp->debugfs_root);
134 queue->dfs_bitmap.array = (u32 *)queue->mask;
135 queue->dfs_bitmap.n_elements =
136 DIV_ROUND_UP(PTP_MAX_CHANNELS, BITS_PER_BYTE * sizeof(u32));
137 debugfs_create_u32_array("mask", 0444, queue->debugfs_instance,
138 &queue->dfs_bitmap);
139
140 return 0;
141}
142
143int ptp_release(struct posix_clock_context *pccontext)
144{
145 struct timestamp_event_queue *queue = pccontext->private_clkdata;
146 unsigned long flags;
147 struct ptp_clock *ptp =
148 container_of(pccontext->clk, struct ptp_clock, clock);
149
150 debugfs_remove(queue->debugfs_instance);
151 pccontext->private_clkdata = NULL;
152 spin_lock_irqsave(&ptp->tsevqs_lock, flags);
153 list_del(&queue->qlist);
154 spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
155 bitmap_free(queue->mask);
156 kfree(queue);
157 return 0;
158}
159
160long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd,
161 unsigned long arg)
162{
163 struct ptp_clock *ptp =
164 container_of(pccontext->clk, struct ptp_clock, clock);
165 struct ptp_sys_offset_extended *extoff = NULL;
166 struct ptp_sys_offset_precise precise_offset;
167 struct system_device_crosststamp xtstamp;
168 struct ptp_clock_info *ops = ptp->info;
169 struct ptp_sys_offset *sysoff = NULL;
170 struct timestamp_event_queue *tsevq;
171 struct ptp_system_timestamp sts;
172 struct ptp_clock_request req;
173 struct ptp_clock_caps caps;
174 struct ptp_clock_time *pct;
175 unsigned int i, pin_index;
176 struct ptp_pin_desc pd;
177 struct timespec64 ts;
178 int enable, err = 0;
179
180 if (in_compat_syscall() && cmd != PTP_ENABLE_PPS && cmd != PTP_ENABLE_PPS2)
181 arg = (unsigned long)compat_ptr(arg);
182
183 tsevq = pccontext->private_clkdata;
184
185 switch (cmd) {
186
187 case PTP_CLOCK_GETCAPS:
188 case PTP_CLOCK_GETCAPS2:
189 memset(&caps, 0, sizeof(caps));
190
191 caps.max_adj = ptp->info->max_adj;
192 caps.n_alarm = ptp->info->n_alarm;
193 caps.n_ext_ts = ptp->info->n_ext_ts;
194 caps.n_per_out = ptp->info->n_per_out;
195 caps.pps = ptp->info->pps;
196 caps.n_pins = ptp->info->n_pins;
197 caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
198 caps.adjust_phase = ptp->info->adjphase != NULL &&
199 ptp->info->getmaxphase != NULL;
200 if (caps.adjust_phase)
201 caps.max_phase_adj = ptp->info->getmaxphase(ptp->info);
202 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
203 err = -EFAULT;
204 break;
205
206 case PTP_EXTTS_REQUEST:
207 case PTP_EXTTS_REQUEST2:
208 memset(&req, 0, sizeof(req));
209
210 if (copy_from_user(&req.extts, (void __user *)arg,
211 sizeof(req.extts))) {
212 err = -EFAULT;
213 break;
214 }
215 if (cmd == PTP_EXTTS_REQUEST2) {
216 /* Tell the drivers to check the flags carefully. */
217 req.extts.flags |= PTP_STRICT_FLAGS;
218 /* Make sure no reserved bit is set. */
219 if ((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) ||
220 req.extts.rsv[0] || req.extts.rsv[1]) {
221 err = -EINVAL;
222 break;
223 }
224 /* Ensure one of the rising/falling edge bits is set. */
225 if ((req.extts.flags & PTP_ENABLE_FEATURE) &&
226 (req.extts.flags & PTP_EXTTS_EDGES) == 0) {
227 err = -EINVAL;
228 break;
229 }
230 } else if (cmd == PTP_EXTTS_REQUEST) {
231 req.extts.flags &= PTP_EXTTS_V1_VALID_FLAGS;
232 req.extts.rsv[0] = 0;
233 req.extts.rsv[1] = 0;
234 }
235 if (req.extts.index >= ops->n_ext_ts) {
236 err = -EINVAL;
237 break;
238 }
239 req.type = PTP_CLK_REQ_EXTTS;
240 enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
241 if (mutex_lock_interruptible(&ptp->pincfg_mux))
242 return -ERESTARTSYS;
243 err = ops->enable(ops, &req, enable);
244 mutex_unlock(&ptp->pincfg_mux);
245 break;
246
247 case PTP_PEROUT_REQUEST:
248 case PTP_PEROUT_REQUEST2:
249 memset(&req, 0, sizeof(req));
250
251 if (copy_from_user(&req.perout, (void __user *)arg,
252 sizeof(req.perout))) {
253 err = -EFAULT;
254 break;
255 }
256 if (cmd == PTP_PEROUT_REQUEST2) {
257 struct ptp_perout_request *perout = &req.perout;
258
259 if (perout->flags & ~PTP_PEROUT_VALID_FLAGS) {
260 err = -EINVAL;
261 break;
262 }
263 /*
264 * The "on" field has undefined meaning if
265 * PTP_PEROUT_DUTY_CYCLE isn't set, we must still treat
266 * it as reserved, which must be set to zero.
267 */
268 if (!(perout->flags & PTP_PEROUT_DUTY_CYCLE) &&
269 (perout->rsv[0] || perout->rsv[1] ||
270 perout->rsv[2] || perout->rsv[3])) {
271 err = -EINVAL;
272 break;
273 }
274 if (perout->flags & PTP_PEROUT_DUTY_CYCLE) {
275 /* The duty cycle must be subunitary. */
276 if (perout->on.sec > perout->period.sec ||
277 (perout->on.sec == perout->period.sec &&
278 perout->on.nsec > perout->period.nsec)) {
279 err = -ERANGE;
280 break;
281 }
282 }
283 if (perout->flags & PTP_PEROUT_PHASE) {
284 /*
285 * The phase should be specified modulo the
286 * period, therefore anything equal or larger
287 * than 1 period is invalid.
288 */
289 if (perout->phase.sec > perout->period.sec ||
290 (perout->phase.sec == perout->period.sec &&
291 perout->phase.nsec >= perout->period.nsec)) {
292 err = -ERANGE;
293 break;
294 }
295 }
296 } else if (cmd == PTP_PEROUT_REQUEST) {
297 req.perout.flags &= PTP_PEROUT_V1_VALID_FLAGS;
298 req.perout.rsv[0] = 0;
299 req.perout.rsv[1] = 0;
300 req.perout.rsv[2] = 0;
301 req.perout.rsv[3] = 0;
302 }
303 if (req.perout.index >= ops->n_per_out) {
304 err = -EINVAL;
305 break;
306 }
307 req.type = PTP_CLK_REQ_PEROUT;
308 enable = req.perout.period.sec || req.perout.period.nsec;
309 if (mutex_lock_interruptible(&ptp->pincfg_mux))
310 return -ERESTARTSYS;
311 err = ops->enable(ops, &req, enable);
312 mutex_unlock(&ptp->pincfg_mux);
313 break;
314
315 case PTP_ENABLE_PPS:
316 case PTP_ENABLE_PPS2:
317 memset(&req, 0, sizeof(req));
318
319 if (!capable(CAP_SYS_TIME))
320 return -EPERM;
321 req.type = PTP_CLK_REQ_PPS;
322 enable = arg ? 1 : 0;
323 if (mutex_lock_interruptible(&ptp->pincfg_mux))
324 return -ERESTARTSYS;
325 err = ops->enable(ops, &req, enable);
326 mutex_unlock(&ptp->pincfg_mux);
327 break;
328
329 case PTP_SYS_OFFSET_PRECISE:
330 case PTP_SYS_OFFSET_PRECISE2:
331 if (!ptp->info->getcrosststamp) {
332 err = -EOPNOTSUPP;
333 break;
334 }
335 err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
336 if (err)
337 break;
338
339 memset(&precise_offset, 0, sizeof(precise_offset));
340 ts = ktime_to_timespec64(xtstamp.device);
341 precise_offset.device.sec = ts.tv_sec;
342 precise_offset.device.nsec = ts.tv_nsec;
343 ts = ktime_to_timespec64(xtstamp.sys_realtime);
344 precise_offset.sys_realtime.sec = ts.tv_sec;
345 precise_offset.sys_realtime.nsec = ts.tv_nsec;
346 ts = ktime_to_timespec64(xtstamp.sys_monoraw);
347 precise_offset.sys_monoraw.sec = ts.tv_sec;
348 precise_offset.sys_monoraw.nsec = ts.tv_nsec;
349 if (copy_to_user((void __user *)arg, &precise_offset,
350 sizeof(precise_offset)))
351 err = -EFAULT;
352 break;
353
354 case PTP_SYS_OFFSET_EXTENDED:
355 case PTP_SYS_OFFSET_EXTENDED2:
356 if (!ptp->info->gettimex64) {
357 err = -EOPNOTSUPP;
358 break;
359 }
360 extoff = memdup_user((void __user *)arg, sizeof(*extoff));
361 if (IS_ERR(extoff)) {
362 err = PTR_ERR(extoff);
363 extoff = NULL;
364 break;
365 }
366 if (extoff->n_samples > PTP_MAX_SAMPLES ||
367 extoff->rsv[0] || extoff->rsv[1] ||
368 (extoff->clockid != CLOCK_REALTIME &&
369 extoff->clockid != CLOCK_MONOTONIC &&
370 extoff->clockid != CLOCK_MONOTONIC_RAW)) {
371 err = -EINVAL;
372 break;
373 }
374 sts.clockid = extoff->clockid;
375 for (i = 0; i < extoff->n_samples; i++) {
376 err = ptp->info->gettimex64(ptp->info, &ts, &sts);
377 if (err)
378 goto out;
379 extoff->ts[i][0].sec = sts.pre_ts.tv_sec;
380 extoff->ts[i][0].nsec = sts.pre_ts.tv_nsec;
381 extoff->ts[i][1].sec = ts.tv_sec;
382 extoff->ts[i][1].nsec = ts.tv_nsec;
383 extoff->ts[i][2].sec = sts.post_ts.tv_sec;
384 extoff->ts[i][2].nsec = sts.post_ts.tv_nsec;
385 }
386 if (copy_to_user((void __user *)arg, extoff, sizeof(*extoff)))
387 err = -EFAULT;
388 break;
389
390 case PTP_SYS_OFFSET:
391 case PTP_SYS_OFFSET2:
392 sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
393 if (IS_ERR(sysoff)) {
394 err = PTR_ERR(sysoff);
395 sysoff = NULL;
396 break;
397 }
398 if (sysoff->n_samples > PTP_MAX_SAMPLES) {
399 err = -EINVAL;
400 break;
401 }
402 pct = &sysoff->ts[0];
403 for (i = 0; i < sysoff->n_samples; i++) {
404 ktime_get_real_ts64(&ts);
405 pct->sec = ts.tv_sec;
406 pct->nsec = ts.tv_nsec;
407 pct++;
408 if (ops->gettimex64)
409 err = ops->gettimex64(ops, &ts, NULL);
410 else
411 err = ops->gettime64(ops, &ts);
412 if (err)
413 goto out;
414 pct->sec = ts.tv_sec;
415 pct->nsec = ts.tv_nsec;
416 pct++;
417 }
418 ktime_get_real_ts64(&ts);
419 pct->sec = ts.tv_sec;
420 pct->nsec = ts.tv_nsec;
421 if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
422 err = -EFAULT;
423 break;
424
425 case PTP_PIN_GETFUNC:
426 case PTP_PIN_GETFUNC2:
427 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
428 err = -EFAULT;
429 break;
430 }
431 if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
432 || pd.rsv[3] || pd.rsv[4])
433 && cmd == PTP_PIN_GETFUNC2) {
434 err = -EINVAL;
435 break;
436 } else if (cmd == PTP_PIN_GETFUNC) {
437 pd.rsv[0] = 0;
438 pd.rsv[1] = 0;
439 pd.rsv[2] = 0;
440 pd.rsv[3] = 0;
441 pd.rsv[4] = 0;
442 }
443 pin_index = pd.index;
444 if (pin_index >= ops->n_pins) {
445 err = -EINVAL;
446 break;
447 }
448 pin_index = array_index_nospec(pin_index, ops->n_pins);
449 if (mutex_lock_interruptible(&ptp->pincfg_mux))
450 return -ERESTARTSYS;
451 pd = ops->pin_config[pin_index];
452 mutex_unlock(&ptp->pincfg_mux);
453 if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
454 err = -EFAULT;
455 break;
456
457 case PTP_PIN_SETFUNC:
458 case PTP_PIN_SETFUNC2:
459 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
460 err = -EFAULT;
461 break;
462 }
463 if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
464 || pd.rsv[3] || pd.rsv[4])
465 && cmd == PTP_PIN_SETFUNC2) {
466 err = -EINVAL;
467 break;
468 } else if (cmd == PTP_PIN_SETFUNC) {
469 pd.rsv[0] = 0;
470 pd.rsv[1] = 0;
471 pd.rsv[2] = 0;
472 pd.rsv[3] = 0;
473 pd.rsv[4] = 0;
474 }
475 pin_index = pd.index;
476 if (pin_index >= ops->n_pins) {
477 err = -EINVAL;
478 break;
479 }
480 pin_index = array_index_nospec(pin_index, ops->n_pins);
481 if (mutex_lock_interruptible(&ptp->pincfg_mux))
482 return -ERESTARTSYS;
483 err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
484 mutex_unlock(&ptp->pincfg_mux);
485 break;
486
487 case PTP_MASK_CLEAR_ALL:
488 bitmap_clear(tsevq->mask, 0, PTP_MAX_CHANNELS);
489 break;
490
491 case PTP_MASK_EN_SINGLE:
492 if (copy_from_user(&i, (void __user *)arg, sizeof(i))) {
493 err = -EFAULT;
494 break;
495 }
496 if (i >= PTP_MAX_CHANNELS) {
497 err = -EFAULT;
498 break;
499 }
500 set_bit(i, tsevq->mask);
501 break;
502
503 default:
504 err = -ENOTTY;
505 break;
506 }
507
508out:
509 kfree(extoff);
510 kfree(sysoff);
511 return err;
512}
513
514__poll_t ptp_poll(struct posix_clock_context *pccontext, struct file *fp,
515 poll_table *wait)
516{
517 struct ptp_clock *ptp =
518 container_of(pccontext->clk, struct ptp_clock, clock);
519 struct timestamp_event_queue *queue;
520
521 queue = pccontext->private_clkdata;
522 if (!queue)
523 return EPOLLERR;
524
525 poll_wait(fp, &ptp->tsev_wq, wait);
526
527 return queue_cnt(queue) ? EPOLLIN : 0;
528}
529
530#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
531
532ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags,
533 char __user *buf, size_t cnt)
534{
535 struct ptp_clock *ptp =
536 container_of(pccontext->clk, struct ptp_clock, clock);
537 struct timestamp_event_queue *queue;
538 struct ptp_extts_event *event;
539 unsigned long flags;
540 size_t qcnt, i;
541 int result;
542
543 queue = pccontext->private_clkdata;
544 if (!queue) {
545 result = -EINVAL;
546 goto exit;
547 }
548
549 if (cnt % sizeof(struct ptp_extts_event) != 0) {
550 result = -EINVAL;
551 goto exit;
552 }
553
554 if (cnt > EXTTS_BUFSIZE)
555 cnt = EXTTS_BUFSIZE;
556
557 cnt = cnt / sizeof(struct ptp_extts_event);
558
559 if (wait_event_interruptible(ptp->tsev_wq,
560 ptp->defunct || queue_cnt(queue))) {
561 return -ERESTARTSYS;
562 }
563
564 if (ptp->defunct) {
565 result = -ENODEV;
566 goto exit;
567 }
568
569 event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
570 if (!event) {
571 result = -ENOMEM;
572 goto exit;
573 }
574
575 spin_lock_irqsave(&queue->lock, flags);
576
577 qcnt = queue_cnt(queue);
578
579 if (cnt > qcnt)
580 cnt = qcnt;
581
582 for (i = 0; i < cnt; i++) {
583 event[i] = queue->buf[queue->head];
584 /* Paired with READ_ONCE() in queue_cnt() */
585 WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS);
586 }
587
588 spin_unlock_irqrestore(&queue->lock, flags);
589
590 cnt = cnt * sizeof(struct ptp_extts_event);
591
592 result = cnt;
593 if (copy_to_user(buf, event, cnt)) {
594 result = -EFAULT;
595 goto free_event;
596 }
597
598free_event:
599 kfree(event);
600exit:
601 return result;
602}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PTP 1588 clock support - character device implementation.
4 *
5 * Copyright (C) 2010 OMICRON electronics GmbH
6 */
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>
13
14#include <linux/nospec.h>
15
16#include "ptp_private.h"
17
18static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
19 enum ptp_pin_function func, unsigned int chan)
20{
21 struct ptp_clock_request rq;
22 int err = 0;
23
24 memset(&rq, 0, sizeof(rq));
25
26 switch (func) {
27 case PTP_PF_NONE:
28 break;
29 case PTP_PF_EXTTS:
30 rq.type = PTP_CLK_REQ_EXTTS;
31 rq.extts.index = chan;
32 err = ops->enable(ops, &rq, 0);
33 break;
34 case PTP_PF_PEROUT:
35 rq.type = PTP_CLK_REQ_PEROUT;
36 rq.perout.index = chan;
37 err = ops->enable(ops, &rq, 0);
38 break;
39 case PTP_PF_PHYSYNC:
40 break;
41 default:
42 return -EINVAL;
43 }
44
45 return err;
46}
47
48int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
49 enum ptp_pin_function func, unsigned int chan)
50{
51 struct ptp_clock_info *info = ptp->info;
52 struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin];
53 unsigned int i;
54
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];
60 break;
61 }
62 }
63 if (pin1 && i == pin)
64 return 0;
65
66 /* Check the desired function and channel. */
67 switch (func) {
68 case PTP_PF_NONE:
69 break;
70 case PTP_PF_EXTTS:
71 if (chan >= info->n_ext_ts)
72 return -EINVAL;
73 break;
74 case PTP_PF_PEROUT:
75 if (chan >= info->n_per_out)
76 return -EINVAL;
77 break;
78 case PTP_PF_PHYSYNC:
79 if (chan != 0)
80 return -EINVAL;
81 break;
82 default:
83 return -EINVAL;
84 }
85
86 if (info->verify(info, pin, func, chan)) {
87 pr_err("driver cannot use function %u on pin %u\n", func, chan);
88 return -EOPNOTSUPP;
89 }
90
91 /* Disable whatever function was previously assigned. */
92 if (pin1) {
93 ptp_disable_pinfunc(info, func, chan);
94 pin1->func = PTP_PF_NONE;
95 pin1->chan = 0;
96 }
97 ptp_disable_pinfunc(info, pin2->func, pin2->chan);
98 pin2->func = func;
99 pin2->chan = chan;
100
101 return 0;
102}
103
104int ptp_open(struct posix_clock *pc, fmode_t fmode)
105{
106 return 0;
107}
108
109long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
110{
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;
124 int enable, err = 0;
125
126 switch (cmd) {
127
128 case PTP_CLOCK_GETCAPS:
129 case PTP_CLOCK_GETCAPS2:
130 memset(&caps, 0, sizeof(caps));
131
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)))
140 err = -EFAULT;
141 break;
142
143 case PTP_EXTTS_REQUEST:
144 case PTP_EXTTS_REQUEST2:
145 memset(&req, 0, sizeof(req));
146
147 if (copy_from_user(&req.extts, (void __user *)arg,
148 sizeof(req.extts))) {
149 err = -EFAULT;
150 break;
151 }
152 if (cmd == PTP_EXTTS_REQUEST2) {
153 /* Tell the drivers to check the flags carefully. */
154 req.extts.flags |= PTP_STRICT_FLAGS;
155 /* Make sure no reserved bit is set. */
156 if ((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) ||
157 req.extts.rsv[0] || req.extts.rsv[1]) {
158 err = -EINVAL;
159 break;
160 }
161 /* Ensure one of the rising/falling edge bits is set. */
162 if ((req.extts.flags & PTP_ENABLE_FEATURE) &&
163 (req.extts.flags & PTP_EXTTS_EDGES) == 0) {
164 err = -EINVAL;
165 break;
166 }
167 } else if (cmd == PTP_EXTTS_REQUEST) {
168 req.extts.flags &= PTP_EXTTS_V1_VALID_FLAGS;
169 req.extts.rsv[0] = 0;
170 req.extts.rsv[1] = 0;
171 }
172 if (req.extts.index >= ops->n_ext_ts) {
173 err = -EINVAL;
174 break;
175 }
176 req.type = PTP_CLK_REQ_EXTTS;
177 enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
178 err = ops->enable(ops, &req, enable);
179 break;
180
181 case PTP_PEROUT_REQUEST:
182 case PTP_PEROUT_REQUEST2:
183 memset(&req, 0, sizeof(req));
184
185 if (copy_from_user(&req.perout, (void __user *)arg,
186 sizeof(req.perout))) {
187 err = -EFAULT;
188 break;
189 }
190 if (((req.perout.flags & ~PTP_PEROUT_VALID_FLAGS) ||
191 req.perout.rsv[0] || req.perout.rsv[1] ||
192 req.perout.rsv[2] || req.perout.rsv[3]) &&
193 cmd == PTP_PEROUT_REQUEST2) {
194 err = -EINVAL;
195 break;
196 } else if (cmd == PTP_PEROUT_REQUEST) {
197 req.perout.flags &= PTP_PEROUT_V1_VALID_FLAGS;
198 req.perout.rsv[0] = 0;
199 req.perout.rsv[1] = 0;
200 req.perout.rsv[2] = 0;
201 req.perout.rsv[3] = 0;
202 }
203 if (req.perout.index >= ops->n_per_out) {
204 err = -EINVAL;
205 break;
206 }
207 req.type = PTP_CLK_REQ_PEROUT;
208 enable = req.perout.period.sec || req.perout.period.nsec;
209 err = ops->enable(ops, &req, enable);
210 break;
211
212 case PTP_ENABLE_PPS:
213 case PTP_ENABLE_PPS2:
214 memset(&req, 0, sizeof(req));
215
216 if (!capable(CAP_SYS_TIME))
217 return -EPERM;
218 req.type = PTP_CLK_REQ_PPS;
219 enable = arg ? 1 : 0;
220 err = ops->enable(ops, &req, enable);
221 break;
222
223 case PTP_SYS_OFFSET_PRECISE:
224 case PTP_SYS_OFFSET_PRECISE2:
225 if (!ptp->info->getcrosststamp) {
226 err = -EOPNOTSUPP;
227 break;
228 }
229 err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
230 if (err)
231 break;
232
233 memset(&precise_offset, 0, sizeof(precise_offset));
234 ts = ktime_to_timespec64(xtstamp.device);
235 precise_offset.device.sec = ts.tv_sec;
236 precise_offset.device.nsec = ts.tv_nsec;
237 ts = ktime_to_timespec64(xtstamp.sys_realtime);
238 precise_offset.sys_realtime.sec = ts.tv_sec;
239 precise_offset.sys_realtime.nsec = ts.tv_nsec;
240 ts = ktime_to_timespec64(xtstamp.sys_monoraw);
241 precise_offset.sys_monoraw.sec = ts.tv_sec;
242 precise_offset.sys_monoraw.nsec = ts.tv_nsec;
243 if (copy_to_user((void __user *)arg, &precise_offset,
244 sizeof(precise_offset)))
245 err = -EFAULT;
246 break;
247
248 case PTP_SYS_OFFSET_EXTENDED:
249 case PTP_SYS_OFFSET_EXTENDED2:
250 if (!ptp->info->gettimex64) {
251 err = -EOPNOTSUPP;
252 break;
253 }
254 extoff = memdup_user((void __user *)arg, sizeof(*extoff));
255 if (IS_ERR(extoff)) {
256 err = PTR_ERR(extoff);
257 extoff = NULL;
258 break;
259 }
260 if (extoff->n_samples > PTP_MAX_SAMPLES
261 || extoff->rsv[0] || extoff->rsv[1] || extoff->rsv[2]) {
262 err = -EINVAL;
263 break;
264 }
265 for (i = 0; i < extoff->n_samples; i++) {
266 err = ptp->info->gettimex64(ptp->info, &ts, &sts);
267 if (err)
268 goto out;
269 extoff->ts[i][0].sec = sts.pre_ts.tv_sec;
270 extoff->ts[i][0].nsec = sts.pre_ts.tv_nsec;
271 extoff->ts[i][1].sec = ts.tv_sec;
272 extoff->ts[i][1].nsec = ts.tv_nsec;
273 extoff->ts[i][2].sec = sts.post_ts.tv_sec;
274 extoff->ts[i][2].nsec = sts.post_ts.tv_nsec;
275 }
276 if (copy_to_user((void __user *)arg, extoff, sizeof(*extoff)))
277 err = -EFAULT;
278 break;
279
280 case PTP_SYS_OFFSET:
281 case PTP_SYS_OFFSET2:
282 sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
283 if (IS_ERR(sysoff)) {
284 err = PTR_ERR(sysoff);
285 sysoff = NULL;
286 break;
287 }
288 if (sysoff->n_samples > PTP_MAX_SAMPLES) {
289 err = -EINVAL;
290 break;
291 }
292 pct = &sysoff->ts[0];
293 for (i = 0; i < sysoff->n_samples; i++) {
294 ktime_get_real_ts64(&ts);
295 pct->sec = ts.tv_sec;
296 pct->nsec = ts.tv_nsec;
297 pct++;
298 if (ops->gettimex64)
299 err = ops->gettimex64(ops, &ts, NULL);
300 else
301 err = ops->gettime64(ops, &ts);
302 if (err)
303 goto out;
304 pct->sec = ts.tv_sec;
305 pct->nsec = ts.tv_nsec;
306 pct++;
307 }
308 ktime_get_real_ts64(&ts);
309 pct->sec = ts.tv_sec;
310 pct->nsec = ts.tv_nsec;
311 if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
312 err = -EFAULT;
313 break;
314
315 case PTP_PIN_GETFUNC:
316 case PTP_PIN_GETFUNC2:
317 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
318 err = -EFAULT;
319 break;
320 }
321 if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
322 || pd.rsv[3] || pd.rsv[4])
323 && cmd == PTP_PIN_GETFUNC2) {
324 err = -EINVAL;
325 break;
326 } else if (cmd == PTP_PIN_GETFUNC) {
327 pd.rsv[0] = 0;
328 pd.rsv[1] = 0;
329 pd.rsv[2] = 0;
330 pd.rsv[3] = 0;
331 pd.rsv[4] = 0;
332 }
333 pin_index = pd.index;
334 if (pin_index >= ops->n_pins) {
335 err = -EINVAL;
336 break;
337 }
338 pin_index = array_index_nospec(pin_index, ops->n_pins);
339 if (mutex_lock_interruptible(&ptp->pincfg_mux))
340 return -ERESTARTSYS;
341 pd = ops->pin_config[pin_index];
342 mutex_unlock(&ptp->pincfg_mux);
343 if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
344 err = -EFAULT;
345 break;
346
347 case PTP_PIN_SETFUNC:
348 case PTP_PIN_SETFUNC2:
349 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
350 err = -EFAULT;
351 break;
352 }
353 if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
354 || pd.rsv[3] || pd.rsv[4])
355 && cmd == PTP_PIN_SETFUNC2) {
356 err = -EINVAL;
357 break;
358 } else if (cmd == PTP_PIN_SETFUNC) {
359 pd.rsv[0] = 0;
360 pd.rsv[1] = 0;
361 pd.rsv[2] = 0;
362 pd.rsv[3] = 0;
363 pd.rsv[4] = 0;
364 }
365 pin_index = pd.index;
366 if (pin_index >= ops->n_pins) {
367 err = -EINVAL;
368 break;
369 }
370 pin_index = array_index_nospec(pin_index, ops->n_pins);
371 if (mutex_lock_interruptible(&ptp->pincfg_mux))
372 return -ERESTARTSYS;
373 err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
374 mutex_unlock(&ptp->pincfg_mux);
375 break;
376
377 default:
378 err = -ENOTTY;
379 break;
380 }
381
382out:
383 kfree(extoff);
384 kfree(sysoff);
385 return err;
386}
387
388__poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
389{
390 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
391
392 poll_wait(fp, &ptp->tsev_wq, wait);
393
394 return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0;
395}
396
397#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
398
399ssize_t ptp_read(struct posix_clock *pc,
400 uint rdflags, char __user *buf, size_t cnt)
401{
402 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
403 struct timestamp_event_queue *queue = &ptp->tsevq;
404 struct ptp_extts_event *event;
405 unsigned long flags;
406 size_t qcnt, i;
407 int result;
408
409 if (cnt % sizeof(struct ptp_extts_event) != 0)
410 return -EINVAL;
411
412 if (cnt > EXTTS_BUFSIZE)
413 cnt = EXTTS_BUFSIZE;
414
415 cnt = cnt / sizeof(struct ptp_extts_event);
416
417 if (mutex_lock_interruptible(&ptp->tsevq_mux))
418 return -ERESTARTSYS;
419
420 if (wait_event_interruptible(ptp->tsev_wq,
421 ptp->defunct || queue_cnt(queue))) {
422 mutex_unlock(&ptp->tsevq_mux);
423 return -ERESTARTSYS;
424 }
425
426 if (ptp->defunct) {
427 mutex_unlock(&ptp->tsevq_mux);
428 return -ENODEV;
429 }
430
431 event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
432 if (!event) {
433 mutex_unlock(&ptp->tsevq_mux);
434 return -ENOMEM;
435 }
436
437 spin_lock_irqsave(&queue->lock, flags);
438
439 qcnt = queue_cnt(queue);
440
441 if (cnt > qcnt)
442 cnt = qcnt;
443
444 for (i = 0; i < cnt; i++) {
445 event[i] = queue->buf[queue->head];
446 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
447 }
448
449 spin_unlock_irqrestore(&queue->lock, flags);
450
451 cnt = cnt * sizeof(struct ptp_extts_event);
452
453 mutex_unlock(&ptp->tsevq_mux);
454
455 result = cnt;
456 if (copy_to_user(buf, event, cnt))
457 result = -EFAULT;
458
459 kfree(event);
460 return result;
461}