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

/*
 * PTP 1588 clock support
 *
 * 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/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 "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);
}

static 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;
}

/* posix clock implementation */

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

static int ptp_clock_settime(struct posix_clock *pc, const struct timespec *tp)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	return ptp->info->settime(ptp->info, tp);
}

static int ptp_clock_gettime(struct posix_clock *pc, struct timespec *tp)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	return ptp->info->gettime(ptp->info, tp);
}

static int ptp_clock_adjtime(struct posix_clock *pc, struct 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 timespec 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 = timespec_to_ktime(ts);
		delta = ktime_to_ns(kt);
		err = ops->adjtime(ops, delta);
	} else if (tx->modes & ADJ_FREQUENCY) {
		err = ops->adjfreq(ops, scaled_ppm_to_ppb(tx->freq));
		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);
}

/* 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);

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

	dev_set_drvdata(ptp->dev, ptp);

	err = ptp_populate_sysfs(ptp);
	if (err)
		goto no_sysfs;

	/* 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 (!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:
	ptp_cleanup_sysfs(ptp);
no_sysfs:
	device_destroy(ptp_class, ptp->devid);
no_device:
	mutex_destroy(&ptp->tsevq_mux);
	mutex_destroy(&ptp->pincfg_mux);
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);

	/* Release the clock's resources. */
	if (ptp->pps_source)
		pps_unregister_source(ptp->pps_source);
	ptp_cleanup_sysfs(ptp);
	device_destroy(ptp_class, ptp->devid);

	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);

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