[linux-block.git] / drivers / ptp / ptp_sysfs.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * PTP 1588 clock support - sysfs interface.
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 * Copyright 2021 NXP
 */
#include <linux/capability.h>
#include <linux/slab.h>

#include "ptp_private.h"

static ssize_t clock_name_show(struct device *dev,
			       struct device_attribute *attr, char *page)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	return sysfs_emit(page, "%s\n", ptp->info->name);
}
static DEVICE_ATTR_RO(clock_name);

#define PTP_SHOW_INT(name, var)						\
static ssize_t var##_show(struct device *dev,				\
			   struct device_attribute *attr, char *page)	\
{									\
	struct ptp_clock *ptp = dev_get_drvdata(dev);			\
	return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var);	\
}									\
static DEVICE_ATTR(name, 0444, var##_show, NULL);

PTP_SHOW_INT(max_adjustment, max_adj);
PTP_SHOW_INT(n_alarms, n_alarm);
PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
PTP_SHOW_INT(n_periodic_outputs, n_per_out);
PTP_SHOW_INT(n_programmable_pins, n_pins);
PTP_SHOW_INT(pps_available, pps);

static ssize_t extts_enable_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t count)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	struct ptp_clock_info *ops = ptp->info;
	struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
	int cnt, enable;
	int err = -EINVAL;

	cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
	if (cnt != 2)
		goto out;
	if (req.extts.index >= ops->n_ext_ts)
		goto out;

	err = ops->enable(ops, &req, enable ? 1 : 0);
	if (err)
		goto out;

	return count;
out:
	return err;
}
static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);

static ssize_t extts_fifo_show(struct device *dev,
			       struct device_attribute *attr, char *page)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	struct timestamp_event_queue *queue = &ptp->tsevq;
	struct ptp_extts_event event;
	unsigned long flags;
	size_t qcnt;
	int cnt = 0;

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

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

	spin_lock_irqsave(&queue->lock, flags);
	qcnt = queue_cnt(queue);
	if (qcnt) {
		event = queue->buf[queue->head];
		queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
	}
	spin_unlock_irqrestore(&queue->lock, flags);

	if (!qcnt)
		goto out;

	cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
		       event.index, event.t.sec, event.t.nsec);
out:
	mutex_unlock(&ptp->tsevq_mux);
	return cnt;
}
static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);

static ssize_t period_store(struct device *dev,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	struct ptp_clock_info *ops = ptp->info;
	struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
	int cnt, enable, err = -EINVAL;

	cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
		     &req.perout.start.sec, &req.perout.start.nsec,
		     &req.perout.period.sec, &req.perout.period.nsec);
	if (cnt != 5)
		goto out;
	if (req.perout.index >= ops->n_per_out)
		goto out;

	enable = req.perout.period.sec || req.perout.period.nsec;
	err = ops->enable(ops, &req, enable);
	if (err)
		goto out;

	return count;
out:
	return err;
}
static DEVICE_ATTR(period, 0220, NULL, period_store);

static ssize_t pps_enable_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	struct ptp_clock_info *ops = ptp->info;
	struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
	int cnt, enable;
	int err = -EINVAL;

	if (!capable(CAP_SYS_TIME))
		return -EPERM;

	cnt = sscanf(buf, "%d", &enable);
	if (cnt != 1)
		goto out;

	err = ops->enable(ops, &req, enable ? 1 : 0);
	if (err)
		goto out;

	return count;
out:
	return err;
}
static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);

static int unregister_vclock(struct device *dev, void *data)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	struct ptp_clock_info *info = ptp->info;
	struct ptp_vclock *vclock;
	u32 *num = data;

	vclock = info_to_vclock(info);
	dev_info(dev->parent, "delete virtual clock ptp%d\n",
		 vclock->clock->index);

	ptp_vclock_unregister(vclock);
	(*num)--;

	/* For break. Not error. */
	if (*num == 0)
		return -EINVAL;

	return 0;
}

static ssize_t n_vclocks_show(struct device *dev,
			      struct device_attribute *attr, char *page)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	ssize_t size;

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

	size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->n_vclocks);

	mutex_unlock(&ptp->n_vclocks_mux);

	return size;
}

static ssize_t n_vclocks_store(struct device *dev,
			       struct device_attribute *attr,
			       const char *buf, size_t count)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	struct ptp_vclock *vclock;
	int err = -EINVAL;
	u32 num, i;

	if (kstrtou32(buf, 0, &num))
		return err;

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

	if (num > ptp->max_vclocks) {
		dev_err(dev, "max value is %d\n", ptp->max_vclocks);
		goto out;
	}

	/* Need to create more vclocks */
	if (num > ptp->n_vclocks) {
		for (i = 0; i < num - ptp->n_vclocks; i++) {
			vclock = ptp_vclock_register(ptp);
			if (!vclock)
				goto out;

			*(ptp->vclock_index + ptp->n_vclocks + i) =
				vclock->clock->index;

			dev_info(dev, "new virtual clock ptp%d\n",
				 vclock->clock->index);
		}
	}

	/* Need to delete vclocks */
	if (num < ptp->n_vclocks) {
		i = ptp->n_vclocks - num;
		device_for_each_child_reverse(dev, &i,
					      unregister_vclock);

		for (i = 1; i <= ptp->n_vclocks - num; i++)
			*(ptp->vclock_index + ptp->n_vclocks - i) = -1;
	}

	/* Need to inform about changed physical clock behavior */
	if (!ptp->has_cycles) {
		if (num == 0)
			dev_info(dev, "only physical clock in use now\n");
		else
			dev_info(dev, "guarantee physical clock free running\n");
	}

	ptp->n_vclocks = num;
	mutex_unlock(&ptp->n_vclocks_mux);

	return count;
out:
	mutex_unlock(&ptp->n_vclocks_mux);
	return err;
}
static DEVICE_ATTR_RW(n_vclocks);

static ssize_t max_vclocks_show(struct device *dev,
				struct device_attribute *attr, char *page)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	ssize_t size;

	size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->max_vclocks);

	return size;
}

static ssize_t max_vclocks_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	unsigned int *vclock_index;
	int err = -EINVAL;
	size_t size;
	u32 max;

	if (kstrtou32(buf, 0, &max) || max == 0)
		return -EINVAL;

	if (max == ptp->max_vclocks)
		return count;

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

	if (max < ptp->n_vclocks)
		goto out;

	size = sizeof(int) * max;
	vclock_index = kzalloc(size, GFP_KERNEL);
	if (!vclock_index) {
		err = -ENOMEM;
		goto out;
	}

	size = sizeof(int) * ptp->n_vclocks;
	memcpy(vclock_index, ptp->vclock_index, size);

	kfree(ptp->vclock_index);
	ptp->vclock_index = vclock_index;
	ptp->max_vclocks = max;

	mutex_unlock(&ptp->n_vclocks_mux);

	return count;
out:
	mutex_unlock(&ptp->n_vclocks_mux);
	return err;
}
static DEVICE_ATTR_RW(max_vclocks);

static struct attribute *ptp_attrs[] = {
	&dev_attr_clock_name.attr,

	&dev_attr_max_adjustment.attr,
	&dev_attr_n_alarms.attr,
	&dev_attr_n_external_timestamps.attr,
	&dev_attr_n_periodic_outputs.attr,
	&dev_attr_n_programmable_pins.attr,
	&dev_attr_pps_available.attr,

	&dev_attr_extts_enable.attr,
	&dev_attr_fifo.attr,
	&dev_attr_period.attr,
	&dev_attr_pps_enable.attr,
	&dev_attr_n_vclocks.attr,
	&dev_attr_max_vclocks.attr,
	NULL
};

static umode_t ptp_is_attribute_visible(struct kobject *kobj,
					struct attribute *attr, int n)
{
	struct device *dev = kobj_to_dev(kobj);
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	struct ptp_clock_info *info = ptp->info;
	umode_t mode = attr->mode;

	if (attr == &dev_attr_extts_enable.attr ||
	    attr == &dev_attr_fifo.attr) {
		if (!info->n_ext_ts)
			mode = 0;
	} else if (attr == &dev_attr_period.attr) {
		if (!info->n_per_out)
			mode = 0;
	} else if (attr == &dev_attr_pps_enable.attr) {
		if (!info->pps)
			mode = 0;
	} else if (attr == &dev_attr_n_vclocks.attr ||
		   attr == &dev_attr_max_vclocks.attr) {
		if (ptp->is_virtual_clock)
			mode = 0;
	}

	return mode;
}

static const struct attribute_group ptp_group = {
	.is_visible	= ptp_is_attribute_visible,
	.attrs		= ptp_attrs,
};

const struct attribute_group *ptp_groups[] = {
	&ptp_group,
	NULL
};

static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
{
	int i;
	for (i = 0; i < ptp->info->n_pins; i++) {
		if (!strcmp(ptp->info->pin_config[i].name, name))
			return i;
	}
	return -1;
}

static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr,
			    char *page)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	unsigned int func, chan;
	int index;

	index = ptp_pin_name2index(ptp, attr->attr.name);
	if (index < 0)
		return -EINVAL;

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

	func = ptp->info->pin_config[index].func;
	chan = ptp->info->pin_config[index].chan;

	mutex_unlock(&ptp->pincfg_mux);

	return sysfs_emit(page, "%u %u\n", func, chan);
}

static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct ptp_clock *ptp = dev_get_drvdata(dev);
	unsigned int func, chan;
	int cnt, err, index;

	cnt = sscanf(buf, "%u %u", &func, &chan);
	if (cnt != 2)
		return -EINVAL;

	index = ptp_pin_name2index(ptp, attr->attr.name);
	if (index < 0)
		return -EINVAL;

	if (mutex_lock_interruptible(&ptp->pincfg_mux))
		return -ERESTARTSYS;
	err = ptp_set_pinfunc(ptp, index, func, chan);
	mutex_unlock(&ptp->pincfg_mux);
	if (err)
		return err;

	return count;
}

int ptp_populate_pin_groups(struct ptp_clock *ptp)
{
	struct ptp_clock_info *info = ptp->info;
	int err = -ENOMEM, i, n_pins = info->n_pins;

	if (!n_pins)
		return 0;

	ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr),
				    GFP_KERNEL);
	if (!ptp->pin_dev_attr)
		goto no_dev_attr;

	ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL);
	if (!ptp->pin_attr)
		goto no_pin_attr;

	for (i = 0; i < n_pins; i++) {
		struct device_attribute *da = &ptp->pin_dev_attr[i];
		sysfs_attr_init(&da->attr);
		da->attr.name = info->pin_config[i].name;
		da->attr.mode = 0644;
		da->show = ptp_pin_show;
		da->store = ptp_pin_store;
		ptp->pin_attr[i] = &da->attr;
	}

	ptp->pin_attr_group.name = "pins";
	ptp->pin_attr_group.attrs = ptp->pin_attr;

	ptp->pin_attr_groups[0] = &ptp->pin_attr_group;

	return 0;

no_pin_attr:
	kfree(ptp->pin_dev_attr);
no_dev_attr:
	return err;
}

void ptp_cleanup_pin_groups(struct ptp_clock *ptp)
{
	kfree(ptp->pin_attr);
	kfree(ptp->pin_dev_attr);
}
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
d94ba80e RC	2	/*
	3	* PTP 1588 clock support - sysfs interface.
	4	*
	5	* Copyright (C) 2010 OMICRON electronics GmbH
73f37068	6	* Copyright 2021 NXP
d94ba80e RC	7	*/
d94ba80e RC	8	#include <linux/capability.h>
653104d1	9	#include <linux/slab.h>
d94ba80e RC	10
	11	#include "ptp_private.h"
	12
	13	static ssize_t clock_name_show(struct device *dev,
	14	struct device_attribute attr, char page)
	15	{
	16	struct ptp_clock *ptp = dev_get_drvdata(dev);
e2cf0765	17	return sysfs_emit(page, "%s\n", ptp->info->name);
d94ba80e	18	}
63215705	19	static DEVICE_ATTR_RO(clock_name);
d94ba80e	20
3499116b GKH	21	#define PTP_SHOW_INT(name, var) \
3499116b GKH	22	static ssize_t var##_show(struct device *dev, \
d94ba80e RC	23	struct device_attribute attr, char page) \
	24	{ \
	25	struct ptp_clock *ptp = dev_get_drvdata(dev); \
3499116b GKH	26	return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
	27	} \
	28	static DEVICE_ATTR(name, 0444, var##_show, NULL);
d94ba80e	29
3499116b GKH	30	PTP_SHOW_INT(max_adjustment, max_adj);
	31	PTP_SHOW_INT(n_alarms, n_alarm);
	32	PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
	33	PTP_SHOW_INT(n_periodic_outputs, n_per_out);
653104d1	34	PTP_SHOW_INT(n_programmable_pins, n_pins);
3499116b	35	PTP_SHOW_INT(pps_available, pps);
d94ba80e	36
d94ba80e RC	37	static ssize_t extts_enable_store(struct device *dev,
	38	struct device_attribute *attr,
	39	const char *buf, size_t count)
	40	{
	41	struct ptp_clock *ptp = dev_get_drvdata(dev);
	42	struct ptp_clock_info *ops = ptp->info;
	43	struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
	44	int cnt, enable;
	45	int err = -EINVAL;
	46
	47	cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
	48	if (cnt != 2)
	49	goto out;
	50	if (req.extts.index >= ops->n_ext_ts)
	51	goto out;
	52
	53	err = ops->enable(ops, &req, enable ? 1 : 0);
	54	if (err)
	55	goto out;
	56
	57	return count;
	58	out:
	59	return err;
	60	}
af59e717	61	static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
d94ba80e RC	62
	63	static ssize_t extts_fifo_show(struct device *dev,
	64	struct device_attribute attr, char page)
	65	{
	66	struct ptp_clock *ptp = dev_get_drvdata(dev);
	67	struct timestamp_event_queue *queue = &ptp->tsevq;
	68	struct ptp_extts_event event;
	69	unsigned long flags;
	70	size_t qcnt;
	71	int cnt = 0;
	72
	73	memset(&event, 0, sizeof(event));
	74
	75	if (mutex_lock_interruptible(&ptp->tsevq_mux))
	76	return -ERESTARTSYS;
	77
	78	spin_lock_irqsave(&queue->lock, flags);
	79	qcnt = queue_cnt(queue);
	80	if (qcnt) {
	81	event = queue->buf[queue->head];
	82	queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
	83	}
	84	spin_unlock_irqrestore(&queue->lock, flags);
	85
	86	if (!qcnt)
	87	goto out;
	88
	89	cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
	90	event.index, event.t.sec, event.t.nsec);
	91	out:
	92	mutex_unlock(&ptp->tsevq_mux);
	93	return cnt;
	94	}
af59e717	95	static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
d94ba80e RC	96
	97	static ssize_t period_store(struct device *dev,
	98	struct device_attribute *attr,
	99	const char *buf, size_t count)
	100	{
	101	struct ptp_clock *ptp = dev_get_drvdata(dev);
	102	struct ptp_clock_info *ops = ptp->info;
	103	struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
	104	int cnt, enable, err = -EINVAL;
	105
	106	cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
	107	&req.perout.start.sec, &req.perout.start.nsec,
	108	&req.perout.period.sec, &req.perout.period.nsec);
	109	if (cnt != 5)
	110	goto out;
	111	if (req.perout.index >= ops->n_per_out)
	112	goto out;
	113
	114	enable = req.perout.period.sec \|\| req.perout.period.nsec;
	115	err = ops->enable(ops, &req, enable);
	116	if (err)
	117	goto out;
	118
	119	return count;
	120	out:
	121	return err;
	122	}
af59e717	123	static DEVICE_ATTR(period, 0220, NULL, period_store);
d94ba80e RC	124
	125	static ssize_t pps_enable_store(struct device *dev,
	126	struct device_attribute *attr,
	127	const char *buf, size_t count)
	128	{
	129	struct ptp_clock *ptp = dev_get_drvdata(dev);
	130	struct ptp_clock_info *ops = ptp->info;
	131	struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
	132	int cnt, enable;
	133	int err = -EINVAL;
	134
	135	if (!capable(CAP_SYS_TIME))
	136	return -EPERM;
	137
	138	cnt = sscanf(buf, "%d", &enable);
	139	if (cnt != 1)
	140	goto out;
	141
	142	err = ops->enable(ops, &req, enable ? 1 : 0);
	143	if (err)
	144	goto out;
	145
	146	return count;
	147	out:
	148	return err;
	149	}
af59e717 DT	150	static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
af59e717 DT	151
73f37068 YL	152	static int unregister_vclock(struct device dev, void data)
	153	{
	154	struct ptp_clock *ptp = dev_get_drvdata(dev);
	155	struct ptp_clock_info *info = ptp->info;
	156	struct ptp_vclock *vclock;
d329e41a	157	u32 *num = data;
73f37068 YL	158
	159	vclock = info_to_vclock(info);
	160	dev_info(dev->parent, "delete virtual clock ptp%d\n",
	161	vclock->clock->index);
	162
	163	ptp_vclock_unregister(vclock);
	164	(*num)--;
	165
	166	/* For break. Not error. */
	167	if (*num == 0)
	168	return -EINVAL;
	169
	170	return 0;
	171	}
	172
	173	static ssize_t n_vclocks_show(struct device *dev,
	174	struct device_attribute attr, char page)
	175	{
	176	struct ptp_clock *ptp = dev_get_drvdata(dev);
	177	ssize_t size;
	178
	179	if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
	180	return -ERESTARTSYS;
	181
f6a175cf	182	size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->n_vclocks);
73f37068 YL	183
	184	mutex_unlock(&ptp->n_vclocks_mux);
	185
	186	return size;
	187	}
	188
	189	static ssize_t n_vclocks_store(struct device *dev,
	190	struct device_attribute *attr,
	191	const char *buf, size_t count)
	192	{
	193	struct ptp_clock *ptp = dev_get_drvdata(dev);
	194	struct ptp_vclock *vclock;
	195	int err = -EINVAL;
	196	u32 num, i;
	197
	198	if (kstrtou32(buf, 0, &num))
	199	return err;
	200
	201	if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
	202	return -ERESTARTSYS;
	203
	204	if (num > ptp->max_vclocks) {
	205	dev_err(dev, "max value is %d\n", ptp->max_vclocks);
	206	goto out;
	207	}
	208
	209	/* Need to create more vclocks */
	210	if (num > ptp->n_vclocks) {
	211	for (i = 0; i < num - ptp->n_vclocks; i++) {
	212	vclock = ptp_vclock_register(ptp);
	213	if (!vclock)
	214	goto out;
	215
44c494c8 YL	216	*(ptp->vclock_index + ptp->n_vclocks + i) =
	217	vclock->clock->index;
	218
73f37068 YL	219	dev_info(dev, "new virtual clock ptp%d\n",
	220	vclock->clock->index);
	221	}
	222	}
	223
	224	/* Need to delete vclocks */
	225	if (num < ptp->n_vclocks) {
	226	i = ptp->n_vclocks - num;
	227	device_for_each_child_reverse(dev, &i,
	228	unregister_vclock);
44c494c8 YL	229
	230	for (i = 1; i <= ptp->n_vclocks - num; i++)
	231	*(ptp->vclock_index + ptp->n_vclocks - i) = -1;
73f37068 YL	232	}
73f37068 YL	233
42704b26 GE	234	/* Need to inform about changed physical clock behavior */
	235	if (!ptp->has_cycles) {
	236	if (num == 0)
	237	dev_info(dev, "only physical clock in use now\n");
	238	else
	239	dev_info(dev, "guarantee physical clock free running\n");
	240	}
73f37068 YL	241
	242	ptp->n_vclocks = num;
	243	mutex_unlock(&ptp->n_vclocks_mux);
	244
	245	return count;
	246	out:
	247	mutex_unlock(&ptp->n_vclocks_mux);
	248	return err;
	249	}
	250	static DEVICE_ATTR_RW(n_vclocks);
	251
	252	static ssize_t max_vclocks_show(struct device *dev,
	253	struct device_attribute attr, char page)
	254	{
	255	struct ptp_clock *ptp = dev_get_drvdata(dev);
	256	ssize_t size;
	257
f6a175cf	258	size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->max_vclocks);
73f37068 YL	259
	260	return size;
	261	}
	262
	263	static ssize_t max_vclocks_store(struct device *dev,
	264	struct device_attribute *attr,
	265	const char *buf, size_t count)
	266	{
	267	struct ptp_clock *ptp = dev_get_drvdata(dev);
44c494c8 YL	268	unsigned int *vclock_index;
	269	int err = -EINVAL;
	270	size_t size;
73f37068 YL	271	u32 max;
	272
	273	if (kstrtou32(buf, 0, &max) \|\| max == 0)
	274	return -EINVAL;
	275
	276	if (max == ptp->max_vclocks)
	277	return count;
	278
	279	if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
	280	return -ERESTARTSYS;
	281
44c494c8 YL	282	if (max < ptp->n_vclocks)
	283	goto out;
	284
	285	size = sizeof(int) * max;
	286	vclock_index = kzalloc(size, GFP_KERNEL);
	287	if (!vclock_index) {
	288	err = -ENOMEM;
	289	goto out;
73f37068 YL	290	}
73f37068 YL	291
44c494c8 YL	292	size = sizeof(int) * ptp->n_vclocks;
	293	memcpy(vclock_index, ptp->vclock_index, size);
	294
	295	kfree(ptp->vclock_index);
	296	ptp->vclock_index = vclock_index;
73f37068 YL	297	ptp->max_vclocks = max;
	298
	299	mutex_unlock(&ptp->n_vclocks_mux);
	300
	301	return count;
44c494c8 YL	302	out:
	303	mutex_unlock(&ptp->n_vclocks_mux);
	304	return err;
73f37068 YL	305	}
	306	static DEVICE_ATTR_RW(max_vclocks);
	307
af59e717 DT	308	static struct attribute *ptp_attrs[] = {
	309	&dev_attr_clock_name.attr,
	310
	311	&dev_attr_max_adjustment.attr,
	312	&dev_attr_n_alarms.attr,
	313	&dev_attr_n_external_timestamps.attr,
	314	&dev_attr_n_periodic_outputs.attr,
	315	&dev_attr_n_programmable_pins.attr,
	316	&dev_attr_pps_available.attr,
	317
	318	&dev_attr_extts_enable.attr,
	319	&dev_attr_fifo.attr,
	320	&dev_attr_period.attr,
	321	&dev_attr_pps_enable.attr,
73f37068 YL	322	&dev_attr_n_vclocks.attr,
73f37068 YL	323	&dev_attr_max_vclocks.attr,
af59e717 DT	324	NULL
	325	};
	326
	327	static umode_t ptp_is_attribute_visible(struct kobject *kobj,
	328	struct attribute *attr, int n)
	329	{
	330	struct device *dev = kobj_to_dev(kobj);
	331	struct ptp_clock *ptp = dev_get_drvdata(dev);
	332	struct ptp_clock_info *info = ptp->info;
	333	umode_t mode = attr->mode;
	334
	335	if (attr == &dev_attr_extts_enable.attr \|\|
	336	attr == &dev_attr_fifo.attr) {
	337	if (!info->n_ext_ts)
	338	mode = 0;
	339	} else if (attr == &dev_attr_period.attr) {
	340	if (!info->n_per_out)
	341	mode = 0;
	342	} else if (attr == &dev_attr_pps_enable.attr) {
	343	if (!info->pps)
	344	mode = 0;
73f37068 YL	345	} else if (attr == &dev_attr_n_vclocks.attr \|\|
	346	attr == &dev_attr_max_vclocks.attr) {
	347	if (ptp->is_virtual_clock)
	348	mode = 0;
af59e717 DT	349	}
	350
	351	return mode;
	352	}
	353
	354	static const struct attribute_group ptp_group = {
	355	.is_visible = ptp_is_attribute_visible,
	356	.attrs = ptp_attrs,
	357	};
	358
	359	const struct attribute_group *ptp_groups[] = {
	360	&ptp_group,
	361	NULL
	362	};
d94ba80e	363
653104d1 RC	364	static int ptp_pin_name2index(struct ptp_clock ptp, const char name)
	365	{
	366	int i;
	367	for (i = 0; i < ptp->info->n_pins; i++) {
	368	if (!strcmp(ptp->info->pin_config[i].name, name))
	369	return i;
	370	}
	371	return -1;
	372	}
	373
	374	static ssize_t ptp_pin_show(struct device dev, struct device_attribute attr,
	375	char *page)
	376	{
	377	struct ptp_clock *ptp = dev_get_drvdata(dev);
	378	unsigned int func, chan;
	379	int index;
	380
	381	index = ptp_pin_name2index(ptp, attr->attr.name);
	382	if (index < 0)
	383	return -EINVAL;
	384
	385	if (mutex_lock_interruptible(&ptp->pincfg_mux))
	386	return -ERESTARTSYS;
	387
	388	func = ptp->info->pin_config[index].func;
	389	chan = ptp->info->pin_config[index].chan;
	390
	391	mutex_unlock(&ptp->pincfg_mux);
	392
e2cf0765	393	return sysfs_emit(page, "%u %u\n", func, chan);
653104d1 RC	394	}
	395
	396	static ssize_t ptp_pin_store(struct device dev, struct device_attribute attr,
	397	const char *buf, size_t count)
	398	{
	399	struct ptp_clock *ptp = dev_get_drvdata(dev);
	400	unsigned int func, chan;
	401	int cnt, err, index;
	402
	403	cnt = sscanf(buf, "%u %u", &func, &chan);
	404	if (cnt != 2)
	405	return -EINVAL;
	406
	407	index = ptp_pin_name2index(ptp, attr->attr.name);
	408	if (index < 0)
	409	return -EINVAL;
	410
	411	if (mutex_lock_interruptible(&ptp->pincfg_mux))
	412	return -ERESTARTSYS;
	413	err = ptp_set_pinfunc(ptp, index, func, chan);
	414	mutex_unlock(&ptp->pincfg_mux);
	415	if (err)
	416	return err;
	417
	418	return count;
	419	}
	420
85a66e55	421	int ptp_populate_pin_groups(struct ptp_clock *ptp)
d94ba80e	422	{
653104d1 RC	423	struct ptp_clock_info *info = ptp->info;
	424	int err = -ENOMEM, i, n_pins = info->n_pins;
	425
85a66e55 DT	426	if (!n_pins)
	427	return 0;
	428
6f7aa56b	429	ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr),
653104d1 RC	430	GFP_KERNEL);
	431	if (!ptp->pin_dev_attr)
	432	goto no_dev_attr;
	433
6f7aa56b	434	ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL);
653104d1 RC	435	if (!ptp->pin_attr)
	436	goto no_pin_attr;
	437
	438	for (i = 0; i < n_pins; i++) {
	439	struct device_attribute *da = &ptp->pin_dev_attr[i];
	440	sysfs_attr_init(&da->attr);
	441	da->attr.name = info->pin_config[i].name;
	442	da->attr.mode = 0644;
	443	da->show = ptp_pin_show;
	444	da->store = ptp_pin_store;
	445	ptp->pin_attr[i] = &da->attr;
	446	}
	447
	448	ptp->pin_attr_group.name = "pins";
	449	ptp->pin_attr_group.attrs = ptp->pin_attr;
	450
85a66e55 DT	451	ptp->pin_attr_groups[0] = &ptp->pin_attr_group;
85a66e55 DT	452
653104d1 RC	453	return 0;
653104d1 RC	454
653104d1 RC	455	no_pin_attr:
	456	kfree(ptp->pin_dev_attr);
	457	no_dev_attr:
	458	return err;
	459	}
	460
85a66e55	461	void ptp_cleanup_pin_groups(struct ptp_clock *ptp)
d94ba80e	462	{
85a66e55 DT	463	kfree(ptp->pin_attr);
85a66e55 DT	464	kfree(ptp->pin_dev_attr);
d94ba80e	465	}