summaryrefslogtreecommitdiffstats
path: root/drivers/ptp/ptp_chardev.c
blob: 7513018c9f9ac72d5c1b0055b55ae9ff36e710b0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * PTP 1588 clock support - character device implementation.
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 */
#include <linux/module.h>
#include <linux/posix-clock.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/timekeeping.h>
#include <linux/debugfs.h>

#include <linux/nospec.h>

#include "ptp_private.h"

static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
			       enum ptp_pin_function func, unsigned int chan)
{
	struct ptp_clock_request rq;
	int err = 0;

	memset(&rq, 0, sizeof(rq));

	switch (func) {
	case PTP_PF_NONE:
		break;
	case PTP_PF_EXTTS:
		rq.type = PTP_CLK_REQ_EXTTS;
		rq.extts.index = chan;
		err = ops->enable(ops, &rq, 0);
		break;
	case PTP_PF_PEROUT:
		rq.type = PTP_CLK_REQ_PEROUT;
		rq.perout.index = chan;
		err = ops->enable(ops, &rq, 0);
		break;
	case PTP_PF_PHYSYNC:
		break;
	default:
		return -EINVAL;
	}

	return err;
}

int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
		    enum ptp_pin_function func, unsigned int chan)
{
	struct ptp_clock_info *info = ptp->info;
	struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin];
	unsigned int i;

	/* Check to see if any other pin previously had this function. */
	for (i = 0; i < info->n_pins; i++) {
		if (info->pin_config[i].func == func &&
		    info->pin_config[i].chan == chan) {
			pin1 = &info->pin_config[i];
			break;
		}
	}
	if (pin1 && i == pin)
		return 0;

	/* Check the desired function and channel. */
	switch (func) {
	case PTP_PF_NONE:
		break;
	case PTP_PF_EXTTS:
		if (chan >= info->n_ext_ts)
			return -EINVAL;
		break;
	case PTP_PF_PEROUT:
		if (chan >= info->n_per_out)
			return -EINVAL;
		break;
	case PTP_PF_PHYSYNC:
		if (chan != 0)
			return -EINVAL;
		break;
	default:
		return -EINVAL;
	}

	if (info->verify(info, pin, func, chan)) {
		pr_err("driver cannot use function %u on pin %u\n", func, chan);
		return -EOPNOTSUPP;
	}

	/* Disable whatever function was previously assigned. */
	if (pin1) {
		ptp_disable_pinfunc(info, func, chan);
		pin1->func = PTP_PF_NONE;
		pin1->chan = 0;
	}
	ptp_disable_pinfunc(info, pin2->func, pin2->chan);
	pin2->func = func;
	pin2->chan = chan;

	return 0;
}

int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode)
{
	struct ptp_clock *ptp =
		container_of(pccontext->clk, struct ptp_clock, clock);
	struct timestamp_event_queue *queue;
	char debugfsname[32];
	unsigned long flags;

	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
	if (!queue)
		return -EINVAL;
	queue->mask = bitmap_alloc(PTP_MAX_CHANNELS, GFP_KERNEL);
	if (!queue->mask) {
		kfree(queue);
		return -EINVAL;
	}
	bitmap_set(queue->mask, 0, PTP_MAX_CHANNELS);
	spin_lock_init(&queue->lock);
	spin_lock_irqsave(&ptp->tsevqs_lock, flags);
	list_add_tail(&queue->qlist, &ptp->tsevqs);
	spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
	pccontext->private_clkdata = queue;

	/* Debugfs contents */
	sprintf(debugfsname, "0x%p", queue);
	queue->debugfs_instance =
		debugfs_create_dir(debugfsname, ptp->debugfs_root);
	queue->dfs_bitmap.array = (u32 *)queue->mask;
	queue->dfs_bitmap.n_elements =
		DIV_ROUND_UP(PTP_MAX_CHANNELS, BITS_PER_BYTE * sizeof(u32));
	debugfs_create_u32_array("mask", 0444, queue->debugfs_instance,
				 &queue->dfs_bitmap);

	return 0;
}

int ptp_release(struct posix_clock_context *pccontext)
{
	struct timestamp_event_queue *queue = pccontext->private_clkdata;
	unsigned long flags;
	struct ptp_clock *ptp =
		container_of(pccontext->clk, struct ptp_clock, clock);

	debugfs_remove(queue->debugfs_instance);
	pccontext->private_clkdata = NULL;
	spin_lock_irqsave(&ptp->tsevqs_lock, flags);
	list_del(&queue->qlist);
	spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
	bitmap_free(queue->mask);
	kfree(queue);
	return 0;
}

long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd,
	       unsigned long arg)
{
	struct ptp_clock *ptp =
		container_of(pccontext->clk, struct ptp_clock, clock);
	struct ptp_sys_offset_extended *extoff = NULL;
	struct ptp_sys_offset_precise precise_offset;
	struct system_device_crosststamp xtstamp;
	struct ptp_clock_info *ops = ptp->info;
	struct ptp_sys_offset *sysoff = NULL;
	struct timestamp_event_queue *tsevq;
	struct ptp_system_timestamp sts;
	struct ptp_clock_request req;
	struct ptp_clock_caps caps;
	struct ptp_clock_time *pct;
	unsigned int i, pin_index;
	struct ptp_pin_desc pd;
	struct timespec64 ts;
	int enable, err = 0;

	tsevq = pccontext->private_clkdata;

	switch (cmd) {

	case PTP_CLOCK_GETCAPS:
	case PTP_CLOCK_GETCAPS2:
		memset(&caps, 0, sizeof(caps));

		caps.max_adj = ptp->info->max_adj;
		caps.n_alarm = ptp->info->n_alarm;
		caps.n_ext_ts = ptp->info->n_ext_ts;
		caps.n_per_out = ptp->info->n_per_out;
		caps.pps = ptp->info->pps;
		caps.n_pins = ptp->info->n_pins;
		caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
		caps.adjust_phase = ptp->info->adjphase != NULL &&
				    ptp->info->getmaxphase != NULL;
		if (caps.adjust_phase)
			caps.max_phase_adj = ptp->info->getmaxphase(ptp->info);
		if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
			err = -EFAULT;
		break;

	case PTP_EXTTS_REQUEST:
	case PTP_EXTTS_REQUEST2:
		memset(&req, 0, sizeof(req));

		if (copy_from_user(&req.extts, (void __user *)arg,
				   sizeof(req.extts))) {
			err = -EFAULT;
			break;
		}
		if (cmd == PTP_EXTTS_REQUEST2) {
			/* Tell the drivers to check the flags carefully. */
			req.extts.flags |= PTP_STRICT_FLAGS;
			/* Make sure no reserved bit is set. */
			if ((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) ||
			    req.extts.rsv[0] || req.extts.rsv[1]) {
				err = -EINVAL;
				break;
			}
			/* Ensure one of the rising/falling edge bits is set. */
			if ((req.extts.flags & PTP_ENABLE_FEATURE) &&
			    (req.extts.flags & PTP_EXTTS_EDGES) == 0) {
				err = -EINVAL;
				break;
			}
		} else if (cmd == PTP_EXTTS_REQUEST) {
			req.extts.flags &= PTP_EXTTS_V1_VALID_FLAGS;
			req.extts.rsv[0] = 0;
			req.extts.rsv[1] = 0;
		}
		if (req.extts.index >= ops->n_ext_ts) {
			err = -EINVAL;
			break;
		}
		req.type = PTP_CLK_REQ_EXTTS;
		enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
		if (mutex_lock_interruptible(&ptp->pincfg_mux))
			return -ERESTARTSYS;
		err = ops->enable(ops, &req, enable);
		mutex_unlock(&ptp->pincfg_mux);
		break;

	case PTP_PEROUT_REQUEST:
	case PTP_PEROUT_REQUEST2:
		memset(&req, 0, sizeof(req));

		if (copy_from_user(&req.perout, (void __user *)arg,
				   sizeof(req.perout))) {
			err = -EFAULT;
			break;
		}
		if (cmd == PTP_PEROUT_REQUEST2) {
			struct ptp_perout_request *perout = &req.perout;

			if (perout->flags & ~PTP_PEROUT_VALID_FLAGS) {
				err = -EINVAL;
				break;
			}
			/*
			 * The "on" field has undefined meaning if
			 * PTP_PEROUT_DUTY_CYCLE isn't set, we must still treat
			 * it as reserved, which must be set to zero.
			 */
			if (!(perout->flags & PTP_PEROUT_DUTY_CYCLE) &&
			    (perout->rsv[0] || perout->rsv[1] ||
			     perout->rsv[2] || perout->rsv[3])) {
				err = -EINVAL;
				break;
			}
			if (perout->flags & PTP_PEROUT_DUTY_CYCLE) {
				/* The duty cycle must be subunitary. */
				if (perout->on.sec > perout->period.sec ||
				    (perout->on.sec == perout->period.sec &&
				     perout->on.nsec > perout->period.nsec)) {
					err = -ERANGE;
					break;
				}
			}
			if (perout->flags & PTP_PEROUT_PHASE) {
				/*
				 * The phase should be specified modulo the
				 * period, therefore anything equal or larger
				 * than 1 period is invalid.
				 */
				if (perout->phase.sec > perout->period.sec ||
				    (perout->phase.sec == perout->period.sec &&
				     perout->phase.nsec >= perout->period.nsec)) {
					err = -ERANGE;
					break;
				}
			}
		} else if (cmd == PTP_PEROUT_REQUEST) {
			req.perout.flags &= PTP_PEROUT_V1_VALID_FLAGS;
			req.perout.rsv[0] = 0;
			req.perout.rsv[1] = 0;
			req.perout.rsv[2] = 0;
			req.perout.rsv[3] = 0;
		}
		if (req.perout.index >= ops->n_per_out) {
			err = -EINVAL;
			break;
		}
		req.type = PTP_CLK_REQ_PEROUT;
		enable = req.perout.period.sec || req.perout.period.nsec;
		if (mutex_lock_interruptible(&ptp->pincfg_mux))
			return -ERESTARTSYS;
		err = ops->enable(ops, &req, enable);
		mutex_unlock(&ptp->pincfg_mux);
		break;

	case PTP_ENABLE_PPS:
	case PTP_ENABLE_PPS2:
		memset(&req, 0, sizeof(req));

		if (!capable(CAP_SYS_TIME))
			return -EPERM;
		req.type = PTP_CLK_REQ_PPS;
		enable = arg ? 1 : 0;
		if (mutex_lock_interruptible(&ptp->pincfg_mux))
			return -ERESTARTSYS;
		err = ops->enable(ops, &req, enable);
		mutex_unlock(&ptp->pincfg_mux);
		break;

	case PTP_SYS_OFFSET_PRECISE:
	case PTP_SYS_OFFSET_PRECISE2:
		if (!ptp->info->getcrosststamp) {
			err = -EOPNOTSUPP;
			break;
		}
		err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
		if (err)
			break;

		memset(&precise_offset, 0, sizeof(precise_offset));
		ts = ktime_to_timespec64(xtstamp.device);
		precise_offset.device.sec = ts.tv_sec;
		precise_offset.device.nsec = ts.tv_nsec;
		ts = ktime_to_timespec64(xtstamp.sys_realtime);
		precise_offset.sys_realtime.sec = ts.tv_sec;
		precise_offset.sys_realtime.nsec = ts.tv_nsec;
		ts = ktime_to_timespec64(xtstamp.sys_monoraw);
		precise_offset.sys_monoraw.sec = ts.tv_sec;
		precise_offset.sys_monoraw.nsec = ts.tv_nsec;
		if (copy_to_user((void __user *)arg, &precise_offset,
				 sizeof(precise_offset)))
			err = -EFAULT;
		break;

	case PTP_SYS_OFFSET_EXTENDED:
	case PTP_SYS_OFFSET_EXTENDED2:
		if (!ptp->info->gettimex64) {
			err = -EOPNOTSUPP;
			break;
		}
		extoff = memdup_user((void __user *)arg, sizeof(*extoff));
		if (IS_ERR(extoff)) {
			err = PTR_ERR(extoff);
			extoff = NULL;
			break;
		}
		if (extoff->n_samples > PTP_MAX_SAMPLES
		    || extoff->rsv[0] || extoff->rsv[1] || extoff->rsv[2]) {
			err = -EINVAL;
			break;
		}
		for (i = 0; i < extoff->n_samples; i++) {
			err = ptp->info->gettimex64(ptp->info, &ts, &sts);
			if (err)
				goto out;
			extoff->ts[i][0].sec = sts.pre_ts.tv_sec;
			extoff->ts[i][0].nsec = sts.pre_ts.tv_nsec;
			extoff->ts[i][1].sec = ts.tv_sec;
			extoff->ts[i][1].nsec = ts.tv_nsec;
			extoff->ts[i][2].sec = sts.post_ts.tv_sec;
			extoff->ts[i][2].nsec = sts.post_ts.tv_nsec;
		}
		if (copy_to_user((void __user *)arg, extoff, sizeof(*extoff)))
			err = -EFAULT;
		break;

	case PTP_SYS_OFFSET:
	case PTP_SYS_OFFSET2:
		sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
		if (IS_ERR(sysoff)) {
			err = PTR_ERR(sysoff);
			sysoff = NULL;
			break;
		}
		if (sysoff->n_samples > PTP_MAX_SAMPLES) {
			err = -EINVAL;
			break;
		}
		pct = &sysoff->ts[0];
		for (i = 0; i < sysoff->n_samples; i++) {
			ktime_get_real_ts64(&ts);
			pct->sec = ts.tv_sec;
			pct->nsec = ts.tv_nsec;
			pct++;
			if (ops->gettimex64)
				err = ops->gettimex64(ops, &ts, NULL);
			else
				err = ops->gettime64(ops, &ts);
			if (err)
				goto out;
			pct->sec = ts.tv_sec;
			pct->nsec = ts.tv_nsec;
			pct++;
		}
		ktime_get_real_ts64(&ts);
		pct->sec = ts.tv_sec;
		pct->nsec = ts.tv_nsec;
		if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
			err = -EFAULT;
		break;

	case PTP_PIN_GETFUNC:
	case PTP_PIN_GETFUNC2:
		if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
			err = -EFAULT;
			break;
		}
		if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
				|| pd.rsv[3] || pd.rsv[4])
			&& cmd == PTP_PIN_GETFUNC2) {
			err = -EINVAL;
			break;
		} else if (cmd == PTP_PIN_GETFUNC) {
			pd.rsv[0] = 0;
			pd.rsv[1] = 0;
			pd.rsv[2] = 0;
			pd.rsv[3] = 0;
			pd.rsv[4] = 0;
		}
		pin_index = pd.index;
		if (pin_index >= ops->n_pins) {
			err = -EINVAL;
			break;
		}
		pin_index = array_index_nospec(pin_index, ops->n_pins);
		if (mutex_lock_interruptible(&ptp->pincfg_mux))
			return -ERESTARTSYS;
		pd = ops->pin_config[pin_index];
		mutex_unlock(&ptp->pincfg_mux);
		if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
			err = -EFAULT;
		break;

	case PTP_PIN_SETFUNC:
	case PTP_PIN_SETFUNC2:
		if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
			err = -EFAULT;
			break;
		}
		if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2]
				|| pd.rsv[3] || pd.rsv[4])
			&& cmd == PTP_PIN_SETFUNC2) {
			err = -EINVAL;
			break;
		} else if (cmd == PTP_PIN_SETFUNC) {
			pd.rsv[0] = 0;
			pd.rsv[1] = 0;
			pd.rsv[2] = 0;
			pd.rsv[3] = 0;
			pd.rsv[4] = 0;
		}
		pin_index = pd.index;
		if (pin_index >= ops->n_pins) {
			err = -EINVAL;
			break;
		}
		pin_index = array_index_nospec(pin_index, ops->n_pins);
		if (mutex_lock_interruptible(&ptp->pincfg_mux))
			return -ERESTARTSYS;
		err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
		mutex_unlock(&ptp->pincfg_mux);
		break;

	case PTP_MASK_CLEAR_ALL:
		bitmap_clear(tsevq->mask, 0, PTP_MAX_CHANNELS);
		break;

	case PTP_MASK_EN_SINGLE:
		if (copy_from_user(&i, (void __user *)arg, sizeof(i))) {
			err = -EFAULT;
			break;
		}
		if (i >= PTP_MAX_CHANNELS) {
			err = -EFAULT;
			break;
		}
		set_bit(i, tsevq->mask);
		break;

	default:
		err = -ENOTTY;
		break;
	}

out:
	kfree(extoff);
	kfree(sysoff);
	return err;
}

__poll_t ptp_poll(struct posix_clock_context *pccontext, struct file *fp,
		  poll_table *wait)
{
	struct ptp_clock *ptp =
		container_of(pccontext->clk, struct ptp_clock, clock);
	struct timestamp_event_queue *queue;

	queue = pccontext->private_clkdata;
	if (!queue)
		return EPOLLERR;

	poll_wait(fp, &ptp->tsev_wq, wait);

	return queue_cnt(queue) ? EPOLLIN : 0;
}

#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))

ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags,
		 char __user *buf, size_t cnt)
{
	struct ptp_clock *ptp =
		container_of(pccontext->clk, struct ptp_clock, clock);
	struct timestamp_event_queue *queue;
	struct ptp_extts_event *event;
	unsigned long flags;
	size_t qcnt, i;
	int result;

	queue = pccontext->private_clkdata;
	if (!queue) {
		result = -EINVAL;
		goto exit;
	}

	if (cnt % sizeof(struct ptp_extts_event) != 0) {
		result = -EINVAL;
		goto exit;
	}

	if (cnt > EXTTS_BUFSIZE)
		cnt = EXTTS_BUFSIZE;

	cnt = cnt / sizeof(struct ptp_extts_event);

	if (wait_event_interruptible(ptp->tsev_wq,
				     ptp->defunct || queue_cnt(queue))) {
		return -ERESTARTSYS;
	}

	if (ptp->defunct) {
		result = -ENODEV;
		goto exit;
	}

	event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
	if (!event) {
		result = -ENOMEM;
		goto exit;
	}

	spin_lock_irqsave(&queue->lock, flags);

	qcnt = queue_cnt(queue);

	if (cnt > qcnt)
		cnt = qcnt;

	for (i = 0; i < cnt; i++) {
		event[i] = queue->buf[queue->head];
		/* Paired with READ_ONCE() in queue_cnt() */
		WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS);
	}

	spin_unlock_irqrestore(&queue->lock, flags);

	cnt = cnt * sizeof(struct ptp_extts_event);

	result = cnt;
	if (copy_to_user(buf, event, cnt)) {
		result = -EFAULT;
		goto free_event;
	}

free_event:
	kfree(event);
exit:
	return result;
}