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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * PTP 1588 clock support
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 */
#include <linux/idr.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/posix-clock.h>
#include <linux/pps_kernel.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <uapi/linux/sched/types.h>

#include "ptp_private.h"

#define PTP_MAX_ALARMS 4
#define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT | PPS_OFFSETASSERT)
#define PTP_PPS_EVENT PPS_CAPTUREASSERT
#define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)

/* private globals */

static dev_t ptp_devt;
static struct class *ptp_class;

static DEFINE_IDA(ptp_clocks_map);

/* time stamp event queue operations */

static inline int queue_free(struct timestamp_event_queue *q)
{
	return PTP_MAX_TIMESTAMPS - queue_cnt(q) - 1;
}

static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
				       struct ptp_clock_event *src)
{
	struct ptp_extts_event *dst;
	unsigned long flags;
	s64 seconds;
	u32 remainder;

	seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);

	spin_lock_irqsave(&queue->lock, flags);

	dst = &queue->buf[queue->tail];
	dst->index = src->index;
	dst->t.sec = seconds;
	dst->t.nsec = remainder;

	if (!queue_free(queue))
		queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;

	queue->tail = (queue->tail + 1) % PTP_MAX_TIMESTAMPS;

	spin_unlock_irqrestore(&queue->lock, flags);
}

s32 scaled_ppm_to_ppb(long ppm)
{
	/*
	 * The 'freq' field in the 'struct timex' is in parts per
	 * million, but with a 16 bit binary fractional field.
	 *
	 * We want to calculate
	 *
	 *    ppb = scaled_ppm * 1000 / 2^16
	 *
	 * which simplifies to
	 *
	 *    ppb = scaled_ppm * 125 / 2^13
	 */
	s64 ppb = 1 + ppm;
	ppb *= 125;
	ppb >>= 13;
	return (s32) ppb;
}
EXPORT_SYMBOL(scaled_ppm_to_ppb);

/* posix clock implementation */

static int ptp_clock_getres(struct posix_clock *pc, struct timespec64 *tp)
{
	tp->tv_sec = 0;
	tp->tv_nsec = 1;
	return 0;
}

static int ptp_clock_settime(struct posix_clock *pc, const struct timespec64 *tp)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);

	return  ptp->info->settime64(ptp->info, tp);
}

static int ptp_clock_gettime(struct posix_clock *pc, struct timespec64 *tp)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	int err;

	if (ptp->info->gettimex64)
		err = ptp->info->gettimex64(ptp->info, tp, NULL);
	else
		err = ptp->info->gettime64(ptp->info, tp);
	return err;
}

static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	struct ptp_clock_info *ops;
	int err = -EOPNOTSUPP;

	ops = ptp->info;

	if (tx->modes & ADJ_SETOFFSET) {
		struct timespec64 ts;
		ktime_t kt;
		s64 delta;

		ts.tv_sec  = tx->time.tv_sec;
		ts.tv_nsec = tx->time.tv_usec;

		if (!(tx->modes & ADJ_NANO))
			ts.tv_nsec *= 1000;

		if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC)
			return -EINVAL;

		kt = timespec64_to_ktime(ts);
		delta = ktime_to_ns(kt);
		err = ops->adjtime(ops, delta);
	} else if (tx->modes & ADJ_FREQUENCY) {
		s32 ppb = scaled_ppm_to_ppb(tx->freq);
		if (ppb > ops->max_adj || ppb < -ops->max_adj)
			return -ERANGE;
		if (ops->adjfine)
			err = ops->adjfine(ops, tx->freq);
		else
			err = ops->adjfreq(ops, ppb);
		ptp->dialed_frequency = tx->freq;
	} else if (tx->modes == 0) {
		tx->freq = ptp->dialed_frequency;
		err = 0;
	}

	return err;
}

static struct posix_clock_operations ptp_clock_ops = {
	.owner		= THIS_MODULE,
	.clock_adjtime	= ptp_clock_adjtime,
	.clock_gettime	= ptp_clock_gettime,
	.clock_getres	= ptp_clock_getres,
	.clock_settime	= ptp_clock_settime,
	.ioctl		= ptp_ioctl,
	.open		= ptp_open,
	.poll		= ptp_poll,
	.read		= ptp_read,
};

static void delete_ptp_clock(struct posix_clock *pc)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);

	mutex_destroy(&ptp->tsevq_mux);
	mutex_destroy(&ptp->pincfg_mux);
	ida_simple_remove(&ptp_clocks_map, ptp->index);
	kfree(ptp);
}

static void ptp_aux_kworker(struct kthread_work *work)
{
	struct ptp_clock *ptp = container_of(work, struct ptp_clock,
					     aux_work.work);
	struct ptp_clock_info *info = ptp->info;
	long delay;

	delay = info->do_aux_work(info);

	if (delay >= 0)
		kthread_queue_delayed_work(ptp->kworker, &ptp->aux_work, delay);
}

/* public interface */

struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
				     struct device *parent)
{
	struct ptp_clock *ptp;
	int err = 0, index, major = MAJOR(ptp_devt);

	if (info->n_alarm > PTP_MAX_ALARMS)
		return ERR_PTR(-EINVAL);

	/* Initialize a clock structure. */
	err = -ENOMEM;
	ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL);
	if (ptp == NULL)
		goto no_memory;

	index = ida_simple_get(&ptp_clocks_map, 0, MINORMASK + 1, GFP_KERNEL);
	if (index < 0) {
		err = index;
		goto no_slot;
	}

	ptp->clock.ops = ptp_clock_ops;
	ptp->clock.release = delete_ptp_clock;
	ptp->info = info;
	ptp->devid = MKDEV(major, index);
	ptp->index = index;
	spin_lock_init(&ptp->tsevq.lock);
	mutex_init(&ptp->tsevq_mux);
	mutex_init(&ptp->pincfg_mux);
	init_waitqueue_head(&ptp->tsev_wq);

	if (ptp->info->do_aux_work) {
		kthread_init_delayed_work(&ptp->aux_work, ptp_aux_kworker);
		ptp->kworker = kthread_create_worker(0, "ptp%d", ptp->index);
		if (IS_ERR(ptp->kworker)) {
			err = PTR_ERR(ptp->kworker);
			pr_err("failed to create ptp aux_worker %d\n", err);
			goto kworker_err;
		}
	}

	err = ptp_populate_pin_groups(ptp);
	if (err)
		goto no_pin_groups;

	/* Create a new device in our class. */
	ptp->dev = device_create_with_groups(ptp_class, parent, ptp->devid,
					     ptp, ptp->pin_attr_groups,
					     "ptp%d", ptp->index);
	if (IS_ERR(ptp->dev)) {
		err = PTR_ERR(ptp->dev);
		goto no_device;
	}

	/* Register a new PPS source. */
	if (info->pps) {
		struct pps_source_info pps;
		memset(&pps, 0, sizeof(pps));
		snprintf(pps.name, PPS_MAX_NAME_LEN, "ptp%d", index);
		pps.mode = PTP_PPS_MODE;
		pps.owner = info->owner;
		ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS);
		if (IS_ERR(ptp->pps_source)) {
			err = PTR_ERR(ptp->pps_source);
			pr_err("failed to register pps source\n");
			goto no_pps;
		}
	}

	/* Create a posix clock. */
	err = posix_clock_register(&ptp->clock, ptp->devid);
	if (err) {
		pr_err("failed to create posix clock\n");
		goto no_clock;
	}

	return ptp;

no_clock:
	if (ptp->pps_source)
		pps_unregister_source(ptp->pps_source);
no_pps:
	device_destroy(ptp_class, ptp->devid);
no_device:
	ptp_cleanup_pin_groups(ptp);
no_pin_groups:
	if (ptp->kworker)
		kthread_destroy_worker(ptp->kworker);
kworker_err:
	mutex_destroy(&ptp->tsevq_mux);
	mutex_destroy(&ptp->pincfg_mux);
	ida_simple_remove(&ptp_clocks_map, index);
no_slot:
	kfree(ptp);
no_memory:
	return ERR_PTR(err);
}
EXPORT_SYMBOL(ptp_clock_register);

int ptp_clock_unregister(struct ptp_clock *ptp)
{
	ptp->defunct = 1;
	wake_up_interruptible(&ptp->tsev_wq);

	if (ptp->kworker) {
		kthread_cancel_delayed_work_sync(&ptp->aux_work);
		kthread_destroy_worker(ptp->kworker);
	}

	/* Release the clock's resources. */
	if (ptp->pps_source)
		pps_unregister_source(ptp->pps_source);

	device_destroy(ptp_class, ptp->devid);
	ptp_cleanup_pin_groups(ptp);

	posix_clock_unregister(&ptp->clock);
	return 0;
}
EXPORT_SYMBOL(ptp_clock_unregister);

void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
{
	struct pps_event_time evt;

	switch (event->type) {

	case PTP_CLOCK_ALARM:
		break;

	case PTP_CLOCK_EXTTS:
		enqueue_external_timestamp(&ptp->tsevq, event);
		wake_up_interruptible(&ptp->tsev_wq);
		break;

	case PTP_CLOCK_PPS:
		pps_get_ts(&evt);
		pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL);
		break;

	case PTP_CLOCK_PPSUSR:
		pps_event(ptp->pps_source, &event->pps_times,
			  PTP_PPS_EVENT, NULL);
		break;
	}
}
EXPORT_SYMBOL(ptp_clock_event);

int ptp_clock_index(struct ptp_clock *ptp)
{
	return ptp->index;
}
EXPORT_SYMBOL(ptp_clock_index);

int ptp_find_pin(struct ptp_clock *ptp,
		 enum ptp_pin_function func, unsigned int chan)
{
	struct ptp_pin_desc *pin = NULL;
	int i;

	mutex_lock(&ptp->pincfg_mux);
	for (i = 0; i < ptp->info->n_pins; i++) {
		if (ptp->info->pin_config[i].func == func &&
		    ptp->info->pin_config[i].chan == chan) {
			pin = &ptp->info->pin_config[i];
			break;
		}
	}
	mutex_unlock(&ptp->pincfg_mux);

	return pin ? i : -1;
}
EXPORT_SYMBOL(ptp_find_pin);

int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay)
{
	return kthread_mod_delayed_work(ptp->kworker, &ptp->aux_work, delay);
}
EXPORT_SYMBOL(ptp_schedule_worker);

/* module operations */

static void __exit ptp_exit(void)
{
	class_destroy(ptp_class);
	unregister_chrdev_region(ptp_devt, MINORMASK + 1);
	ida_destroy(&ptp_clocks_map);
}

static int __init ptp_init(void)
{
	int err;

	ptp_class = class_create(THIS_MODULE, "ptp");
	if (IS_ERR(ptp_class)) {
		pr_err("ptp: failed to allocate class\n");
		return PTR_ERR(ptp_class);
	}

	err = alloc_chrdev_region(&ptp_devt, 0, MINORMASK + 1, "ptp");
	if (err < 0) {
		pr_err("ptp: failed to allocate device region\n");
		goto no_region;
	}

	ptp_class->dev_groups = ptp_groups;
	pr_info("PTP clock support registered\n");
	return 0;

no_region:
	class_destroy(ptp_class);
	return err;
}

subsys_initcall(ptp_init);
module_exit(ptp_exit);

MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
MODULE_DESCRIPTION("PTP clocks support");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
d94ba80e RC	2	/*
	3	* PTP 1588 clock support
	4	*
	5	* Copyright (C) 2010 OMICRON electronics GmbH
d94ba80e	6	*/
7356a764	7	#include <linux/idr.h>
d94ba80e RC	8	#include <linux/device.h>
	9	#include <linux/err.h>
	10	#include <linux/init.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/posix-clock.h>
	14	#include <linux/pps_kernel.h>
	15	#include <linux/slab.h>
	16	#include <linux/syscalls.h>
	17	#include <linux/uaccess.h>
d9535cb7	18	#include <uapi/linux/sched/types.h>
d94ba80e RC	19
	20	#include "ptp_private.h"
	21
	22	#define PTP_MAX_ALARMS 4
d94ba80e RC	23	#define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT \| PPS_OFFSETASSERT)
	24	#define PTP_PPS_EVENT PPS_CAPTUREASSERT
	25	#define PTP_PPS_MODE (PTP_PPS_DEFAULTS \| PPS_CANWAIT \| PPS_TSFMT_TSPEC)
	26
	27	/* private globals */
	28
	29	static dev_t ptp_devt;
	30	static struct class *ptp_class;
	31
7356a764	32	static DEFINE_IDA(ptp_clocks_map);
d94ba80e RC	33
	34	/* time stamp event queue operations */
	35
	36	static inline int queue_free(struct timestamp_event_queue *q)
	37	{
	38	return PTP_MAX_TIMESTAMPS - queue_cnt(q) - 1;
	39	}
	40
	41	static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
	42	struct ptp_clock_event *src)
	43	{
	44	struct ptp_extts_event *dst;
	45	unsigned long flags;
	46	s64 seconds;
	47	u32 remainder;
	48
	49	seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);
	50
	51	spin_lock_irqsave(&queue->lock, flags);
	52
	53	dst = &queue->buf[queue->tail];
	54	dst->index = src->index;
	55	dst->t.sec = seconds;
	56	dst->t.nsec = remainder;
	57
	58	if (!queue_free(queue))
	59	queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
	60
	61	queue->tail = (queue->tail + 1) % PTP_MAX_TIMESTAMPS;
	62
	63	spin_unlock_irqrestore(&queue->lock, flags);
	64	}
	65
4368dada	66	s32 scaled_ppm_to_ppb(long ppm)
d94ba80e RC	67	{
	68	/*
	69	* The 'freq' field in the 'struct timex' is in parts per
	70	* million, but with a 16 bit binary fractional field.
	71	*
	72	* We want to calculate
	73	*
	74	* ppb = scaled_ppm * 1000 / 2^16
	75	*
	76	* which simplifies to
	77	*
	78	* ppb = scaled_ppm * 125 / 2^13
	79	*/
	80	s64 ppb = 1 + ppm;
	81	ppb *= 125;
	82	ppb >>= 13;
	83	return (s32) ppb;
	84	}
4368dada	85	EXPORT_SYMBOL(scaled_ppm_to_ppb);
d94ba80e RC	86
	87	/* posix clock implementation */
	88
d340266e	89	static int ptp_clock_getres(struct posix_clock pc, struct timespec64 tp)
d94ba80e	90	{
d68fb11c TG	91	tp->tv_sec = 0;
	92	tp->tv_nsec = 1;
	93	return 0;
d94ba80e RC	94	}
d94ba80e RC	95
d340266e	96	static int ptp_clock_settime(struct posix_clock pc, const struct timespec64 tp)
d94ba80e RC	97	{
d94ba80e RC	98	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
d7d38f5b	99
d340266e	100	return ptp->info->settime64(ptp->info, tp);
d94ba80e RC	101	}
d94ba80e RC	102
d340266e	103	static int ptp_clock_gettime(struct posix_clock pc, struct timespec64 tp)
d94ba80e RC	104	{
d94ba80e RC	105	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
d7d38f5b RC	106	int err;
d7d38f5b RC	107
916444df ML	108	if (ptp->info->gettimex64)
	109	err = ptp->info->gettimex64(ptp->info, tp, NULL);
	110	else
	111	err = ptp->info->gettime64(ptp->info, tp);
d7d38f5b	112	return err;
d94ba80e RC	113	}
d94ba80e RC	114
ead25417	115	static int ptp_clock_adjtime(struct posix_clock pc, struct __kernel_timex tx)
d94ba80e RC	116	{
	117	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	118	struct ptp_clock_info *ops;
	119	int err = -EOPNOTSUPP;
	120
	121	ops = ptp->info;
	122
	123	if (tx->modes & ADJ_SETOFFSET) {
d340266e	124	struct timespec64 ts;
d94ba80e RC	125	ktime_t kt;
	126	s64 delta;
	127
	128	ts.tv_sec = tx->time.tv_sec;
	129	ts.tv_nsec = tx->time.tv_usec;
	130
	131	if (!(tx->modes & ADJ_NANO))
	132	ts.tv_nsec *= 1000;
	133
	134	if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC)
	135	return -EINVAL;
	136
d340266e	137	kt = timespec64_to_ktime(ts);
d94ba80e RC	138	delta = ktime_to_ns(kt);
d94ba80e RC	139	err = ops->adjtime(ops, delta);
d94ba80e	140	} else if (tx->modes & ADJ_FREQUENCY) {
d39a7435 RC	141	s32 ppb = scaled_ppm_to_ppb(tx->freq);
	142	if (ppb > ops->max_adj \|\| ppb < -ops->max_adj)
	143	return -ERANGE;
d8d26354 RC	144	if (ops->adjfine)
	145	err = ops->adjfine(ops, tx->freq);
	146	else
	147	err = ops->adjfreq(ops, ppb);
39a8cbd9	148	ptp->dialed_frequency = tx->freq;
5c35bad5 RC	149	} else if (tx->modes == 0) {
	150	tx->freq = ptp->dialed_frequency;
	151	err = 0;
d94ba80e RC	152	}
	153
	154	return err;
	155	}
	156
	157	static struct posix_clock_operations ptp_clock_ops = {
	158	.owner = THIS_MODULE,
	159	.clock_adjtime = ptp_clock_adjtime,
	160	.clock_gettime = ptp_clock_gettime,
	161	.clock_getres = ptp_clock_getres,
	162	.clock_settime = ptp_clock_settime,
	163	.ioctl = ptp_ioctl,
	164	.open = ptp_open,
	165	.poll = ptp_poll,
	166	.read = ptp_read,
	167	};
	168
	169	static void delete_ptp_clock(struct posix_clock *pc)
	170	{
	171	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	172
	173	mutex_destroy(&ptp->tsevq_mux);
6092315d	174	mutex_destroy(&ptp->pincfg_mux);
7356a764	175	ida_simple_remove(&ptp_clocks_map, ptp->index);
d94ba80e RC	176	kfree(ptp);
	177	}
	178
d9535cb7 GS	179	static void ptp_aux_kworker(struct kthread_work *work)
	180	{
	181	struct ptp_clock *ptp = container_of(work, struct ptp_clock,
	182	aux_work.work);
	183	struct ptp_clock_info *info = ptp->info;
	184	long delay;
	185
	186	delay = info->do_aux_work(info);
	187
	188	if (delay >= 0)
	189	kthread_queue_delayed_work(ptp->kworker, &ptp->aux_work, delay);
	190	}
	191
d94ba80e RC	192	/* public interface */
d94ba80e RC	193
1ef76158 RC	194	struct ptp_clock ptp_clock_register(struct ptp_clock_info info,
1ef76158 RC	195	struct device *parent)
d94ba80e RC	196	{
	197	struct ptp_clock *ptp;
	198	int err = 0, index, major = MAJOR(ptp_devt);
	199
	200	if (info->n_alarm > PTP_MAX_ALARMS)
	201	return ERR_PTR(-EINVAL);
	202
d94ba80e RC	203	/* Initialize a clock structure. */
	204	err = -ENOMEM;
	205	ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL);
	206	if (ptp == NULL)
	207	goto no_memory;
	208
7356a764 JB	209	index = ida_simple_get(&ptp_clocks_map, 0, MINORMASK + 1, GFP_KERNEL);
	210	if (index < 0) {
	211	err = index;
	212	goto no_slot;
	213	}
	214
d94ba80e RC	215	ptp->clock.ops = ptp_clock_ops;
	216	ptp->clock.release = delete_ptp_clock;
	217	ptp->info = info;
	218	ptp->devid = MKDEV(major, index);
	219	ptp->index = index;
	220	spin_lock_init(&ptp->tsevq.lock);
	221	mutex_init(&ptp->tsevq_mux);
6092315d	222	mutex_init(&ptp->pincfg_mux);
d94ba80e RC	223	init_waitqueue_head(&ptp->tsev_wq);
d94ba80e RC	224
d9535cb7	225	if (ptp->info->do_aux_work) {
d9535cb7	226	kthread_init_delayed_work(&ptp->aux_work, ptp_aux_kworker);
822c5f73	227	ptp->kworker = kthread_create_worker(0, "ptp%d", ptp->index);
d9535cb7 GS	228	if (IS_ERR(ptp->kworker)) {
	229	err = PTR_ERR(ptp->kworker);
	230	pr_err("failed to create ptp aux_worker %d\n", err);
	231	goto kworker_err;
	232	}
	233	}
	234
85a66e55 DT	235	err = ptp_populate_pin_groups(ptp);
	236	if (err)
	237	goto no_pin_groups;
	238
d94ba80e	239	/* Create a new device in our class. */
85a66e55 DT	240	ptp->dev = device_create_with_groups(ptp_class, parent, ptp->devid,
	241	ptp, ptp->pin_attr_groups,
	242	"ptp%d", ptp->index);
aea0a897 Y	243	if (IS_ERR(ptp->dev)) {
aea0a897 Y	244	err = PTR_ERR(ptp->dev);
d94ba80e	245	goto no_device;
aea0a897	246	}
d94ba80e	247
d94ba80e RC	248	/* Register a new PPS source. */
	249	if (info->pps) {
	250	struct pps_source_info pps;
	251	memset(&pps, 0, sizeof(pps));
	252	snprintf(pps.name, PPS_MAX_NAME_LEN, "ptp%d", index);
	253	pps.mode = PTP_PPS_MODE;
	254	pps.owner = info->owner;
	255	ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS);
b9d93594 DC	256	if (IS_ERR(ptp->pps_source)) {
b9d93594 DC	257	err = PTR_ERR(ptp->pps_source);
d94ba80e RC	258	pr_err("failed to register pps source\n");
	259	goto no_pps;
	260	}
	261	}
	262
	263	/* Create a posix clock. */
	264	err = posix_clock_register(&ptp->clock, ptp->devid);
	265	if (err) {
	266	pr_err("failed to create posix clock\n");
	267	goto no_clock;
	268	}
	269
d94ba80e RC	270	return ptp;
	271
	272	no_clock:
	273	if (ptp->pps_source)
	274	pps_unregister_source(ptp->pps_source);
	275	no_pps:
d94ba80e RC	276	device_destroy(ptp_class, ptp->devid);
d94ba80e RC	277	no_device:
85a66e55 DT	278	ptp_cleanup_pin_groups(ptp);
85a66e55 DT	279	no_pin_groups:
d9535cb7 GS	280	if (ptp->kworker)
	281	kthread_destroy_worker(ptp->kworker);
	282	kworker_err:
d94ba80e	283	mutex_destroy(&ptp->tsevq_mux);
6092315d	284	mutex_destroy(&ptp->pincfg_mux);
b9118b72	285	ida_simple_remove(&ptp_clocks_map, index);
7356a764	286	no_slot:
d94ba80e RC	287	kfree(ptp);
d94ba80e RC	288	no_memory:
d94ba80e RC	289	return ERR_PTR(err);
	290	}
	291	EXPORT_SYMBOL(ptp_clock_register);
	292
	293	int ptp_clock_unregister(struct ptp_clock *ptp)
	294	{
	295	ptp->defunct = 1;
	296	wake_up_interruptible(&ptp->tsev_wq);
	297
d9535cb7 GS	298	if (ptp->kworker) {
	299	kthread_cancel_delayed_work_sync(&ptp->aux_work);
	300	kthread_destroy_worker(ptp->kworker);
	301	}
	302
d94ba80e RC	303	/* Release the clock's resources. */
	304	if (ptp->pps_source)
	305	pps_unregister_source(ptp->pps_source);
85a66e55	306
d94ba80e	307	device_destroy(ptp_class, ptp->devid);
85a66e55	308	ptp_cleanup_pin_groups(ptp);
d94ba80e RC	309
	310	posix_clock_unregister(&ptp->clock);
	311	return 0;
	312	}
	313	EXPORT_SYMBOL(ptp_clock_unregister);
	314
	315	void ptp_clock_event(struct ptp_clock ptp, struct ptp_clock_event event)
	316	{
	317	struct pps_event_time evt;
	318
	319	switch (event->type) {
	320
	321	case PTP_CLOCK_ALARM:
	322	break;
	323
	324	case PTP_CLOCK_EXTTS:
	325	enqueue_external_timestamp(&ptp->tsevq, event);
	326	wake_up_interruptible(&ptp->tsev_wq);
	327	break;
	328
	329	case PTP_CLOCK_PPS:
	330	pps_get_ts(&evt);
	331	pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL);
	332	break;
220a60a4 BH	333
	334	case PTP_CLOCK_PPSUSR:
	335	pps_event(ptp->pps_source, &event->pps_times,
	336	PTP_PPS_EVENT, NULL);
	337	break;
d94ba80e RC	338	}
	339	}
	340	EXPORT_SYMBOL(ptp_clock_event);
	341
995a9090 RC	342	int ptp_clock_index(struct ptp_clock *ptp)
	343	{
	344	return ptp->index;
	345	}
	346	EXPORT_SYMBOL(ptp_clock_index);
	347
6092315d RC	348	int ptp_find_pin(struct ptp_clock *ptp,
	349	enum ptp_pin_function func, unsigned int chan)
	350	{
	351	struct ptp_pin_desc *pin = NULL;
	352	int i;
	353
	354	mutex_lock(&ptp->pincfg_mux);
	355	for (i = 0; i < ptp->info->n_pins; i++) {
	356	if (ptp->info->pin_config[i].func == func &&
	357	ptp->info->pin_config[i].chan == chan) {
	358	pin = &ptp->info->pin_config[i];
	359	break;
	360	}
	361	}
	362	mutex_unlock(&ptp->pincfg_mux);
	363
	364	return pin ? i : -1;
	365	}
	366	EXPORT_SYMBOL(ptp_find_pin);
	367
d9535cb7 GS	368	int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay)
	369	{
	370	return kthread_mod_delayed_work(ptp->kworker, &ptp->aux_work, delay);
	371	}
	372	EXPORT_SYMBOL(ptp_schedule_worker);
	373
d94ba80e RC	374	/* module operations */
	375
	376	static void __exit ptp_exit(void)
	377	{
	378	class_destroy(ptp_class);
7356a764 JB	379	unregister_chrdev_region(ptp_devt, MINORMASK + 1);
7356a764 JB	380	ida_destroy(&ptp_clocks_map);
d94ba80e RC	381	}
	382
	383	static int __init ptp_init(void)
	384	{
	385	int err;
	386
	387	ptp_class = class_create(THIS_MODULE, "ptp");
	388	if (IS_ERR(ptp_class)) {
	389	pr_err("ptp: failed to allocate class\n");
	390	return PTR_ERR(ptp_class);
	391	}
	392
7356a764	393	err = alloc_chrdev_region(&ptp_devt, 0, MINORMASK + 1, "ptp");
d94ba80e RC	394	if (err < 0) {
	395	pr_err("ptp: failed to allocate device region\n");
	396	goto no_region;
	397	}
	398
3499116b	399	ptp_class->dev_groups = ptp_groups;
d94ba80e RC	400	pr_info("PTP clock support registered\n");
	401	return 0;
	402
	403	no_region:
	404	class_destroy(ptp_class);
	405	return err;
	406	}
	407
	408	subsys_initcall(ptp_init);
	409	module_exit(ptp_exit);
	410
c2ec3ff6	411	MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
d94ba80e RC	412	MODULE_DESCRIPTION("PTP clocks support");
d94ba80e RC	413	MODULE_LICENSE("GPL");