[linux-2.6-block.git] / drivers / ptp / ptp_chardev.c

/*
 * PTP 1588 clock support - character device implementation.
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#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/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 *pc, fmode_t fmode)
{
	return 0;
}

long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
{
	struct ptp_clock *ptp = container_of(pc, 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 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;

	switch (cmd) {

	case PTP_CLOCK_GETCAPS:
		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;
		if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
			err = -EFAULT;
		break;

	case PTP_EXTTS_REQUEST:
		if (copy_from_user(&req.extts, (void __user *)arg,
				   sizeof(req.extts))) {
			err = -EFAULT;
			break;
		}
		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;
		err = ops->enable(ops, &req, enable);
		break;

	case PTP_PEROUT_REQUEST:
		if (copy_from_user(&req.perout, (void __user *)arg,
				   sizeof(req.perout))) {
			err = -EFAULT;
			break;
		}
		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;
		err = ops->enable(ops, &req, enable);
		break;

	case PTP_ENABLE_PPS:
		if (!capable(CAP_SYS_TIME))
			return -EPERM;
		req.type = PTP_CLK_REQ_PPS;
		enable = arg ? 1 : 0;
		err = ops->enable(ops, &req, enable);
		break;

	case PTP_SYS_OFFSET_PRECISE:
		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:
		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) {
			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:
		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:
		if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
			err = -EFAULT;
			break;
		}
		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:
		if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
			err = -EFAULT;
			break;
		}
		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;

	default:
		err = -ENOTTY;
		break;
	}

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

__poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);

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

	return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0;
}

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

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

	if (cnt % sizeof(struct ptp_extts_event) != 0)
		return -EINVAL;

	if (cnt > EXTTS_BUFSIZE)
		cnt = EXTTS_BUFSIZE;

	cnt = cnt / sizeof(struct ptp_extts_event);

	if (mutex_lock_interruptible(&ptp->tsevq_mux))
		return -ERESTARTSYS;

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

	if (ptp->defunct) {
		mutex_unlock(&ptp->tsevq_mux);
		return -ENODEV;
	}

	event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
	if (!event) {
		mutex_unlock(&ptp->tsevq_mux);
		return -ENOMEM;
	}

	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];
		queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
	}

	spin_unlock_irqrestore(&queue->lock, flags);

	cnt = cnt * sizeof(struct ptp_extts_event);

	mutex_unlock(&ptp->tsevq_mux);

	result = cnt;
	if (copy_to_user(buf, event, cnt))
		result = -EFAULT;

	kfree(event);
	return result;
}
Commit	Line	Data
d94ba80e RC	1	/*
	2	* PTP 1588 clock support - character device implementation.
	3	*
	4	* Copyright (C) 2010 OMICRON electronics GmbH
	5	*
	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.
	10	*
	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.
	15	*
	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.
	19	*/
	20	#include <linux/module.h>
	21	#include <linux/posix-clock.h>
	22	#include <linux/poll.h>
	23	#include <linux/sched.h>
c7ec0bad	24	#include <linux/slab.h>
719f1aa4	25	#include <linux/timekeeping.h>
d94ba80e	26
efa61c8c GS	27	#include <linux/nospec.h>
efa61c8c GS	28
d94ba80e RC	29	#include "ptp_private.h"
d94ba80e RC	30
6092315d RC	31	static int ptp_disable_pinfunc(struct ptp_clock_info *ops,
	32	enum ptp_pin_function func, unsigned int chan)
	33	{
	34	struct ptp_clock_request rq;
	35	int err = 0;
	36
	37	memset(&rq, 0, sizeof(rq));
	38
	39	switch (func) {
	40	case PTP_PF_NONE:
	41	break;
	42	case PTP_PF_EXTTS:
	43	rq.type = PTP_CLK_REQ_EXTTS;
	44	rq.extts.index = chan;
	45	err = ops->enable(ops, &rq, 0);
	46	break;
	47	case PTP_PF_PEROUT:
	48	rq.type = PTP_CLK_REQ_PEROUT;
	49	rq.perout.index = chan;
	50	err = ops->enable(ops, &rq, 0);
	51	break;
	52	case PTP_PF_PHYSYNC:
	53	break;
	54	default:
	55	return -EINVAL;
	56	}
	57
	58	return err;
	59	}
	60
	61	int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
	62	enum ptp_pin_function func, unsigned int chan)
	63	{
	64	struct ptp_clock_info *info = ptp->info;
	65	struct ptp_pin_desc pin1 = NULL, pin2 = &info->pin_config[pin];
	66	unsigned int i;
	67
	68	/* Check to see if any other pin previously had this function. */
	69	for (i = 0; i < info->n_pins; i++) {
	70	if (info->pin_config[i].func == func &&
	71	info->pin_config[i].chan == chan) {
	72	pin1 = &info->pin_config[i];
	73	break;
	74	}
	75	}
	76	if (pin1 && i == pin)
	77	return 0;
	78
	79	/* Check the desired function and channel. */
	80	switch (func) {
	81	case PTP_PF_NONE:
	82	break;
	83	case PTP_PF_EXTTS:
	84	if (chan >= info->n_ext_ts)
	85	return -EINVAL;
	86	break;
	87	case PTP_PF_PEROUT:
	88	if (chan >= info->n_per_out)
	89	return -EINVAL;
	90	break;
	91	case PTP_PF_PHYSYNC:
72df7a72 SS	92	if (chan != 0)
72df7a72 SS	93	return -EINVAL;
9ba8376c	94	break;
6092315d RC	95	default:
	96	return -EINVAL;
	97	}
	98
6092315d RC	99	if (info->verify(info, pin, func, chan)) {
	100	pr_err("driver cannot use function %u on pin %u\n", func, chan);
	101	return -EOPNOTSUPP;
	102	}
	103
	104	/* Disable whatever function was previously assigned. */
	105	if (pin1) {
	106	ptp_disable_pinfunc(info, func, chan);
	107	pin1->func = PTP_PF_NONE;
	108	pin1->chan = 0;
	109	}
	110	ptp_disable_pinfunc(info, pin2->func, pin2->chan);
	111	pin2->func = func;
	112	pin2->chan = chan;
	113
	114	return 0;
	115	}
	116
d94ba80e RC	117	int ptp_open(struct posix_clock *pc, fmode_t fmode)
	118	{
	119	return 0;
	120	}
	121
	122	long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
	123	{
d94ba80e	124	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
36180087	125	struct ptp_sys_offset_extended *extoff = NULL;
fbb960ac ML	126	struct ptp_sys_offset_precise precise_offset;
fbb960ac ML	127	struct system_device_crosststamp xtstamp;
d94ba80e	128	struct ptp_clock_info *ops = ptp->info;
fbb960ac	129	struct ptp_sys_offset *sysoff = NULL;
36180087	130	struct ptp_system_timestamp sts;
fbb960ac ML	131	struct ptp_clock_request req;
fbb960ac ML	132	struct ptp_clock_caps caps;
215b13dd	133	struct ptp_clock_time *pct;
fbb960ac ML	134	unsigned int i, pin_index;
fbb960ac ML	135	struct ptp_pin_desc pd;
e13cfcb0	136	struct timespec64 ts;
d94ba80e RC	137	int enable, err = 0;
	138
	139	switch (cmd) {
	140
	141	case PTP_CLOCK_GETCAPS:
	142	memset(&caps, 0, sizeof(caps));
	143	caps.max_adj = ptp->info->max_adj;
	144	caps.n_alarm = ptp->info->n_alarm;
	145	caps.n_ext_ts = ptp->info->n_ext_ts;
	146	caps.n_per_out = ptp->info->n_per_out;
	147	caps.pps = ptp->info->pps;
6092315d	148	caps.n_pins = ptp->info->n_pins;
719f1aa4	149	caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
e23ef227 DC	150	if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
e23ef227 DC	151	err = -EFAULT;
d94ba80e RC	152	break;
	153
	154	case PTP_EXTTS_REQUEST:
	155	if (copy_from_user(&req.extts, (void __user *)arg,
	156	sizeof(req.extts))) {
	157	err = -EFAULT;
	158	break;
	159	}
	160	if (req.extts.index >= ops->n_ext_ts) {
	161	err = -EINVAL;
	162	break;
	163	}
	164	req.type = PTP_CLK_REQ_EXTTS;
	165	enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
	166	err = ops->enable(ops, &req, enable);
	167	break;
	168
	169	case PTP_PEROUT_REQUEST:
	170	if (copy_from_user(&req.perout, (void __user *)arg,
	171	sizeof(req.perout))) {
	172	err = -EFAULT;
	173	break;
	174	}
	175	if (req.perout.index >= ops->n_per_out) {
	176	err = -EINVAL;
	177	break;
	178	}
	179	req.type = PTP_CLK_REQ_PEROUT;
	180	enable = req.perout.period.sec \|\| req.perout.period.nsec;
	181	err = ops->enable(ops, &req, enable);
	182	break;
	183
	184	case PTP_ENABLE_PPS:
	185	if (!capable(CAP_SYS_TIME))
	186	return -EPERM;
	187	req.type = PTP_CLK_REQ_PPS;
	188	enable = arg ? 1 : 0;
	189	err = ops->enable(ops, &req, enable);
	190	break;
	191
719f1aa4 CH	192	case PTP_SYS_OFFSET_PRECISE:
	193	if (!ptp->info->getcrosststamp) {
	194	err = -EOPNOTSUPP;
	195	break;
	196	}
	197	err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
	198	if (err)
	199	break;
	200
02a9079c	201	memset(&precise_offset, 0, sizeof(precise_offset));
719f1aa4 CH	202	ts = ktime_to_timespec64(xtstamp.device);
	203	precise_offset.device.sec = ts.tv_sec;
	204	precise_offset.device.nsec = ts.tv_nsec;
	205	ts = ktime_to_timespec64(xtstamp.sys_realtime);
	206	precise_offset.sys_realtime.sec = ts.tv_sec;
	207	precise_offset.sys_realtime.nsec = ts.tv_nsec;
	208	ts = ktime_to_timespec64(xtstamp.sys_monoraw);
	209	precise_offset.sys_monoraw.sec = ts.tv_sec;
	210	precise_offset.sys_monoraw.nsec = ts.tv_nsec;
	211	if (copy_to_user((void __user *)arg, &precise_offset,
	212	sizeof(precise_offset)))
	213	err = -EFAULT;
	214	break;
	215
36180087 ML	216	case PTP_SYS_OFFSET_EXTENDED:
	217	if (!ptp->info->gettimex64) {
	218	err = -EOPNOTSUPP;
	219	break;
	220	}
	221	extoff = memdup_user((void __user )arg, sizeof(extoff));
	222	if (IS_ERR(extoff)) {
	223	err = PTR_ERR(extoff);
	224	extoff = NULL;
	225	break;
	226	}
	227	if (extoff->n_samples > PTP_MAX_SAMPLES) {
	228	err = -EINVAL;
	229	break;
	230	}
	231	for (i = 0; i < extoff->n_samples; i++) {
	232	err = ptp->info->gettimex64(ptp->info, &ts, &sts);
	233	if (err)
	234	goto out;
	235	extoff->ts[i][0].sec = sts.pre_ts.tv_sec;
	236	extoff->ts[i][0].nsec = sts.pre_ts.tv_nsec;
	237	extoff->ts[i][1].sec = ts.tv_sec;
	238	extoff->ts[i][1].nsec = ts.tv_nsec;
	239	extoff->ts[i][2].sec = sts.post_ts.tv_sec;
	240	extoff->ts[i][2].nsec = sts.post_ts.tv_nsec;
	241	}
	242	if (copy_to_user((void __user )arg, extoff, sizeof(extoff)))
	243	err = -EFAULT;
	244	break;
	245
215b13dd	246	case PTP_SYS_OFFSET:
2ece068e MFW	247	sysoff = memdup_user((void __user )arg, sizeof(sysoff));
	248	if (IS_ERR(sysoff)) {
	249	err = PTR_ERR(sysoff);
6756325a	250	sysoff = NULL;
215b13dd RC	251	break;
215b13dd RC	252	}
c3484c27	253	if (sysoff->n_samples > PTP_MAX_SAMPLES) {
215b13dd RC	254	err = -EINVAL;
	255	break;
	256	}
c3484c27 RC	257	pct = &sysoff->ts[0];
c3484c27 RC	258	for (i = 0; i < sysoff->n_samples; i++) {
f696a21c	259	ktime_get_real_ts64(&ts);
215b13dd RC	260	pct->sec = ts.tv_sec;
	261	pct->nsec = ts.tv_nsec;
	262	pct++;
916444df ML	263	if (ops->gettimex64)
	264	err = ops->gettimex64(ops, &ts, NULL);
	265	else
	266	err = ops->gettime64(ops, &ts);
83d0bdc7 ML	267	if (err)
83d0bdc7 ML	268	goto out;
215b13dd RC	269	pct->sec = ts.tv_sec;
	270	pct->nsec = ts.tv_nsec;
	271	pct++;
	272	}
f696a21c	273	ktime_get_real_ts64(&ts);
215b13dd RC	274	pct->sec = ts.tv_sec;
215b13dd RC	275	pct->nsec = ts.tv_nsec;
c3484c27	276	if (copy_to_user((void __user )arg, sysoff, sizeof(sysoff)))
215b13dd RC	277	err = -EFAULT;
	278	break;
	279
6092315d RC	280	case PTP_PIN_GETFUNC:
	281	if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
	282	err = -EFAULT;
	283	break;
	284	}
	285	pin_index = pd.index;
	286	if (pin_index >= ops->n_pins) {
	287	err = -EINVAL;
	288	break;
	289	}
efa61c8c	290	pin_index = array_index_nospec(pin_index, ops->n_pins);
6092315d RC	291	if (mutex_lock_interruptible(&ptp->pincfg_mux))
	292	return -ERESTARTSYS;
	293	pd = ops->pin_config[pin_index];
	294	mutex_unlock(&ptp->pincfg_mux);
	295	if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd)))
	296	err = -EFAULT;
	297	break;
	298
	299	case PTP_PIN_SETFUNC:
	300	if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
	301	err = -EFAULT;
	302	break;
	303	}
	304	pin_index = pd.index;
	305	if (pin_index >= ops->n_pins) {
	306	err = -EINVAL;
	307	break;
	308	}
efa61c8c	309	pin_index = array_index_nospec(pin_index, ops->n_pins);
6092315d RC	310	if (mutex_lock_interruptible(&ptp->pincfg_mux))
	311	return -ERESTARTSYS;
	312	err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan);
	313	mutex_unlock(&ptp->pincfg_mux);
	314	break;
	315
d94ba80e RC	316	default:
	317	err = -ENOTTY;
	318	break;
	319	}
c3484c27	320
83d0bdc7	321	out:
36180087	322	kfree(extoff);
c3484c27	323	kfree(sysoff);
d94ba80e RC	324	return err;
	325	}
	326
afc9a42b	327	__poll_t ptp_poll(struct posix_clock pc, struct file fp, poll_table *wait)
d94ba80e RC	328	{
	329	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	330
	331	poll_wait(fp, &ptp->tsev_wq, wait);
	332
a9a08845	333	return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0;
d94ba80e RC	334	}
d94ba80e RC	335
c7ec0bad RC	336	#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
c7ec0bad RC	337
d94ba80e RC	338	ssize_t ptp_read(struct posix_clock *pc,
	339	uint rdflags, char __user *buf, size_t cnt)
	340	{
	341	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	342	struct timestamp_event_queue *queue = &ptp->tsevq;
c7ec0bad	343	struct ptp_extts_event *event;
d94ba80e RC	344	unsigned long flags;
d94ba80e RC	345	size_t qcnt, i;
c7ec0bad	346	int result;
d94ba80e RC	347
	348	if (cnt % sizeof(struct ptp_extts_event) != 0)
	349	return -EINVAL;
	350
c7ec0bad RC	351	if (cnt > EXTTS_BUFSIZE)
c7ec0bad RC	352	cnt = EXTTS_BUFSIZE;
d94ba80e RC	353
	354	cnt = cnt / sizeof(struct ptp_extts_event);
	355
	356	if (mutex_lock_interruptible(&ptp->tsevq_mux))
	357	return -ERESTARTSYS;
	358
	359	if (wait_event_interruptible(ptp->tsev_wq,
	360	ptp->defunct \|\| queue_cnt(queue))) {
	361	mutex_unlock(&ptp->tsevq_mux);
	362	return -ERESTARTSYS;
	363	}
	364
fb5a18cf DC	365	if (ptp->defunct) {
fb5a18cf DC	366	mutex_unlock(&ptp->tsevq_mux);
d94ba80e	367	return -ENODEV;
fb5a18cf	368	}
d94ba80e	369
c7ec0bad RC	370	event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
	371	if (!event) {
	372	mutex_unlock(&ptp->tsevq_mux);
	373	return -ENOMEM;
	374	}
	375
d94ba80e RC	376	spin_lock_irqsave(&queue->lock, flags);
	377
	378	qcnt = queue_cnt(queue);
	379
	380	if (cnt > qcnt)
	381	cnt = qcnt;
	382
	383	for (i = 0; i < cnt; i++) {
	384	event[i] = queue->buf[queue->head];
	385	queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
	386	}
	387
	388	spin_unlock_irqrestore(&queue->lock, flags);
	389
	390	cnt = cnt * sizeof(struct ptp_extts_event);
	391
	392	mutex_unlock(&ptp->tsevq_mux);
	393
c7ec0bad	394	result = cnt;
fb5a18cf	395	if (copy_to_user(buf, event, cnt))
c7ec0bad	396	result = -EFAULT;
d94ba80e	397
c7ec0bad RC	398	kfree(event);
c7ec0bad RC	399	return result;
d94ba80e	400	}