[linux-2.6-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);

static ssize_t max_phase_adjustment_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->getmaxphase(ptp->info));
}
static DEVICE_ATTR_RO(max_phase_adjustment);

#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;
	struct ptp_extts_event event;
	unsigned long flags;
	size_t qcnt;
	int cnt = 0;

	cnt = list_count_nodes(&ptp->tsevqs);
	if (cnt <= 0)
		goto out;

	/* The sysfs fifo will always draw from the fist queue */
	queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue,
				 qlist);

	memset(&event, 0, sizeof(event));
	spin_lock_irqsave(&queue->lock, flags);
	qcnt = queue_cnt(queue);
	if (qcnt) {
		event = 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);

	if (!qcnt)
		goto out;

	cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
		       event.index, event.t.sec, event.t.nsec);
out:
	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_max_phase_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;
	} else if (attr == &dev_attr_max_phase_adjustment.attr) {
		if (!info->adjphase || !info->getmaxphase)
			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
c3b60ab7 RR	21	static ssize_t max_phase_adjustment_show(struct device *dev,
	22	struct device_attribute *attr,
	23	char *page)
	24	{
	25	struct ptp_clock *ptp = dev_get_drvdata(dev);
	26
	27	return snprintf(page, PAGE_SIZE - 1, "%d\n",
	28	ptp->info->getmaxphase(ptp->info));
	29	}
	30	static DEVICE_ATTR_RO(max_phase_adjustment);
	31
3499116b GKH	32	#define PTP_SHOW_INT(name, var) \
3499116b GKH	33	static ssize_t var##_show(struct device *dev, \
d94ba80e RC	34	struct device_attribute attr, char page) \
	35	{ \
	36	struct ptp_clock *ptp = dev_get_drvdata(dev); \
3499116b GKH	37	return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
	38	} \
	39	static DEVICE_ATTR(name, 0444, var##_show, NULL);
d94ba80e	40
3499116b GKH	41	PTP_SHOW_INT(max_adjustment, max_adj);
	42	PTP_SHOW_INT(n_alarms, n_alarm);
	43	PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
	44	PTP_SHOW_INT(n_periodic_outputs, n_per_out);
653104d1	45	PTP_SHOW_INT(n_programmable_pins, n_pins);
3499116b	46	PTP_SHOW_INT(pps_available, pps);
d94ba80e	47
d94ba80e RC	48	static ssize_t extts_enable_store(struct device *dev,
	49	struct device_attribute *attr,
	50	const char *buf, size_t count)
	51	{
	52	struct ptp_clock *ptp = dev_get_drvdata(dev);
	53	struct ptp_clock_info *ops = ptp->info;
	54	struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
	55	int cnt, enable;
	56	int err = -EINVAL;
	57
	58	cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
	59	if (cnt != 2)
	60	goto out;
	61	if (req.extts.index >= ops->n_ext_ts)
	62	goto out;
	63
	64	err = ops->enable(ops, &req, enable ? 1 : 0);
	65	if (err)
	66	goto out;
	67
	68	return count;
	69	out:
	70	return err;
	71	}
af59e717	72	static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
d94ba80e RC	73
	74	static ssize_t extts_fifo_show(struct device *dev,
	75	struct device_attribute attr, char page)
	76	{
	77	struct ptp_clock *ptp = dev_get_drvdata(dev);
d26ab5a3	78	struct timestamp_event_queue *queue;
d94ba80e RC	79	struct ptp_extts_event event;
	80	unsigned long flags;
	81	size_t qcnt;
	82	int cnt = 0;
	83
8f5de6fb XM	84	cnt = list_count_nodes(&ptp->tsevqs);
	85	if (cnt <= 0)
	86	goto out;
	87
d26ab5a3 XM	88	/* The sysfs fifo will always draw from the fist queue */
	89	queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue,
	90	qlist);
	91
d94ba80e	92	memset(&event, 0, sizeof(event));
d94ba80e RC	93	spin_lock_irqsave(&queue->lock, flags);
	94	qcnt = queue_cnt(queue);
	95	if (qcnt) {
	96	event = queue->buf[queue->head];
73bde5a3 ED	97	/* Paired with READ_ONCE() in queue_cnt() */
73bde5a3 ED	98	WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS);
d94ba80e RC	99	}
	100	spin_unlock_irqrestore(&queue->lock, flags);
	101
	102	if (!qcnt)
	103	goto out;
	104
	105	cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
	106	event.index, event.t.sec, event.t.nsec);
	107	out:
d94ba80e RC	108	return cnt;
d94ba80e RC	109	}
af59e717	110	static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
d94ba80e RC	111
	112	static ssize_t period_store(struct device *dev,
	113	struct device_attribute *attr,
	114	const char *buf, size_t count)
	115	{
	116	struct ptp_clock *ptp = dev_get_drvdata(dev);
	117	struct ptp_clock_info *ops = ptp->info;
	118	struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
	119	int cnt, enable, err = -EINVAL;
	120
	121	cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
	122	&req.perout.start.sec, &req.perout.start.nsec,
	123	&req.perout.period.sec, &req.perout.period.nsec);
	124	if (cnt != 5)
	125	goto out;
	126	if (req.perout.index >= ops->n_per_out)
	127	goto out;
	128
	129	enable = req.perout.period.sec \|\| req.perout.period.nsec;
	130	err = ops->enable(ops, &req, enable);
	131	if (err)
	132	goto out;
	133
	134	return count;
	135	out:
	136	return err;
	137	}
af59e717	138	static DEVICE_ATTR(period, 0220, NULL, period_store);
d94ba80e RC	139
	140	static ssize_t pps_enable_store(struct device *dev,
	141	struct device_attribute *attr,
	142	const char *buf, size_t count)
	143	{
	144	struct ptp_clock *ptp = dev_get_drvdata(dev);
	145	struct ptp_clock_info *ops = ptp->info;
	146	struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
	147	int cnt, enable;
	148	int err = -EINVAL;
	149
	150	if (!capable(CAP_SYS_TIME))
	151	return -EPERM;
	152
	153	cnt = sscanf(buf, "%d", &enable);
	154	if (cnt != 1)
	155	goto out;
	156
	157	err = ops->enable(ops, &req, enable ? 1 : 0);
	158	if (err)
	159	goto out;
	160
	161	return count;
	162	out:
	163	return err;
	164	}
af59e717 DT	165	static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
af59e717 DT	166
73f37068 YL	167	static int unregister_vclock(struct device dev, void data)
	168	{
	169	struct ptp_clock *ptp = dev_get_drvdata(dev);
	170	struct ptp_clock_info *info = ptp->info;
	171	struct ptp_vclock *vclock;
d329e41a	172	u32 *num = data;
73f37068 YL	173
	174	vclock = info_to_vclock(info);
	175	dev_info(dev->parent, "delete virtual clock ptp%d\n",
	176	vclock->clock->index);
	177
	178	ptp_vclock_unregister(vclock);
	179	(*num)--;
	180
	181	/* For break. Not error. */
	182	if (*num == 0)
	183	return -EINVAL;
	184
	185	return 0;
	186	}
	187
	188	static ssize_t n_vclocks_show(struct device *dev,
	189	struct device_attribute attr, char page)
	190	{
	191	struct ptp_clock *ptp = dev_get_drvdata(dev);
	192	ssize_t size;
	193
	194	if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
	195	return -ERESTARTSYS;
	196
f6a175cf	197	size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->n_vclocks);
73f37068 YL	198
	199	mutex_unlock(&ptp->n_vclocks_mux);
	200
	201	return size;
	202	}
	203
	204	static ssize_t n_vclocks_store(struct device *dev,
	205	struct device_attribute *attr,
	206	const char *buf, size_t count)
	207	{
	208	struct ptp_clock *ptp = dev_get_drvdata(dev);
	209	struct ptp_vclock *vclock;
	210	int err = -EINVAL;
	211	u32 num, i;
	212
	213	if (kstrtou32(buf, 0, &num))
	214	return err;
	215
	216	if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
	217	return -ERESTARTSYS;
	218
	219	if (num > ptp->max_vclocks) {
	220	dev_err(dev, "max value is %d\n", ptp->max_vclocks);
	221	goto out;
	222	}
	223
	224	/* Need to create more vclocks */
	225	if (num > ptp->n_vclocks) {
	226	for (i = 0; i < num - ptp->n_vclocks; i++) {
	227	vclock = ptp_vclock_register(ptp);
	228	if (!vclock)
	229	goto out;
	230
44c494c8 YL	231	*(ptp->vclock_index + ptp->n_vclocks + i) =
	232	vclock->clock->index;
	233
73f37068 YL	234	dev_info(dev, "new virtual clock ptp%d\n",
	235	vclock->clock->index);
	236	}
	237	}
	238
	239	/* Need to delete vclocks */
	240	if (num < ptp->n_vclocks) {
	241	i = ptp->n_vclocks - num;
	242	device_for_each_child_reverse(dev, &i,
	243	unregister_vclock);
44c494c8 YL	244
	245	for (i = 1; i <= ptp->n_vclocks - num; i++)
	246	*(ptp->vclock_index + ptp->n_vclocks - i) = -1;
73f37068 YL	247	}
73f37068 YL	248
42704b26 GE	249	/* Need to inform about changed physical clock behavior */
	250	if (!ptp->has_cycles) {
	251	if (num == 0)
	252	dev_info(dev, "only physical clock in use now\n");
	253	else
	254	dev_info(dev, "guarantee physical clock free running\n");
	255	}
73f37068 YL	256
	257	ptp->n_vclocks = num;
	258	mutex_unlock(&ptp->n_vclocks_mux);
	259
	260	return count;
	261	out:
	262	mutex_unlock(&ptp->n_vclocks_mux);
	263	return err;
	264	}
	265	static DEVICE_ATTR_RW(n_vclocks);
	266
	267	static ssize_t max_vclocks_show(struct device *dev,
	268	struct device_attribute attr, char page)
	269	{
	270	struct ptp_clock *ptp = dev_get_drvdata(dev);
	271	ssize_t size;
	272
f6a175cf	273	size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->max_vclocks);
73f37068 YL	274
	275	return size;
	276	}
	277
	278	static ssize_t max_vclocks_store(struct device *dev,
	279	struct device_attribute *attr,
	280	const char *buf, size_t count)
	281	{
	282	struct ptp_clock *ptp = dev_get_drvdata(dev);
44c494c8 YL	283	unsigned int *vclock_index;
	284	int err = -EINVAL;
	285	size_t size;
73f37068 YL	286	u32 max;
	287
	288	if (kstrtou32(buf, 0, &max) \|\| max == 0)
	289	return -EINVAL;
	290
	291	if (max == ptp->max_vclocks)
	292	return count;
	293
	294	if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
	295	return -ERESTARTSYS;
	296
44c494c8 YL	297	if (max < ptp->n_vclocks)
	298	goto out;
	299
	300	size = sizeof(int) * max;
	301	vclock_index = kzalloc(size, GFP_KERNEL);
	302	if (!vclock_index) {
	303	err = -ENOMEM;
	304	goto out;
73f37068 YL	305	}
73f37068 YL	306
44c494c8 YL	307	size = sizeof(int) * ptp->n_vclocks;
	308	memcpy(vclock_index, ptp->vclock_index, size);
	309
	310	kfree(ptp->vclock_index);
	311	ptp->vclock_index = vclock_index;
73f37068 YL	312	ptp->max_vclocks = max;
	313
	314	mutex_unlock(&ptp->n_vclocks_mux);
	315
	316	return count;
44c494c8 YL	317	out:
	318	mutex_unlock(&ptp->n_vclocks_mux);
	319	return err;
73f37068 YL	320	}
	321	static DEVICE_ATTR_RW(max_vclocks);
	322
af59e717 DT	323	static struct attribute *ptp_attrs[] = {
	324	&dev_attr_clock_name.attr,
	325
	326	&dev_attr_max_adjustment.attr,
c3b60ab7	327	&dev_attr_max_phase_adjustment.attr,
af59e717 DT	328	&dev_attr_n_alarms.attr,
	329	&dev_attr_n_external_timestamps.attr,
	330	&dev_attr_n_periodic_outputs.attr,
	331	&dev_attr_n_programmable_pins.attr,
	332	&dev_attr_pps_available.attr,
	333
	334	&dev_attr_extts_enable.attr,
	335	&dev_attr_fifo.attr,
	336	&dev_attr_period.attr,
	337	&dev_attr_pps_enable.attr,
73f37068 YL	338	&dev_attr_n_vclocks.attr,
73f37068 YL	339	&dev_attr_max_vclocks.attr,
af59e717 DT	340	NULL
	341	};
	342
	343	static umode_t ptp_is_attribute_visible(struct kobject *kobj,
	344	struct attribute *attr, int n)
	345	{
	346	struct device *dev = kobj_to_dev(kobj);
	347	struct ptp_clock *ptp = dev_get_drvdata(dev);
	348	struct ptp_clock_info *info = ptp->info;
	349	umode_t mode = attr->mode;
	350
	351	if (attr == &dev_attr_extts_enable.attr \|\|
	352	attr == &dev_attr_fifo.attr) {
	353	if (!info->n_ext_ts)
	354	mode = 0;
	355	} else if (attr == &dev_attr_period.attr) {
	356	if (!info->n_per_out)
	357	mode = 0;
	358	} else if (attr == &dev_attr_pps_enable.attr) {
	359	if (!info->pps)
	360	mode = 0;
73f37068 YL	361	} else if (attr == &dev_attr_n_vclocks.attr \|\|
	362	attr == &dev_attr_max_vclocks.attr) {
	363	if (ptp->is_virtual_clock)
	364	mode = 0;
2c5d234d RR	365	} else if (attr == &dev_attr_max_phase_adjustment.attr) {
	366	if (!info->adjphase \|\| !info->getmaxphase)
	367	mode = 0;
af59e717 DT	368	}
	369
	370	return mode;
	371	}
	372
	373	static const struct attribute_group ptp_group = {
	374	.is_visible = ptp_is_attribute_visible,
	375	.attrs = ptp_attrs,
	376	};
	377
	378	const struct attribute_group *ptp_groups[] = {
	379	&ptp_group,
	380	NULL
	381	};
d94ba80e	382
653104d1 RC	383	static int ptp_pin_name2index(struct ptp_clock ptp, const char name)
	384	{
	385	int i;
	386	for (i = 0; i < ptp->info->n_pins; i++) {
	387	if (!strcmp(ptp->info->pin_config[i].name, name))
	388	return i;
	389	}
	390	return -1;
	391	}
	392
	393	static ssize_t ptp_pin_show(struct device dev, struct device_attribute attr,
	394	char *page)
	395	{
	396	struct ptp_clock *ptp = dev_get_drvdata(dev);
	397	unsigned int func, chan;
	398	int index;
	399
	400	index = ptp_pin_name2index(ptp, attr->attr.name);
	401	if (index < 0)
	402	return -EINVAL;
	403
	404	if (mutex_lock_interruptible(&ptp->pincfg_mux))
	405	return -ERESTARTSYS;
	406
	407	func = ptp->info->pin_config[index].func;
	408	chan = ptp->info->pin_config[index].chan;
	409
	410	mutex_unlock(&ptp->pincfg_mux);
	411
e2cf0765	412	return sysfs_emit(page, "%u %u\n", func, chan);
653104d1 RC	413	}
	414
	415	static ssize_t ptp_pin_store(struct device dev, struct device_attribute attr,
	416	const char *buf, size_t count)
	417	{
	418	struct ptp_clock *ptp = dev_get_drvdata(dev);
	419	unsigned int func, chan;
	420	int cnt, err, index;
	421
	422	cnt = sscanf(buf, "%u %u", &func, &chan);
	423	if (cnt != 2)
	424	return -EINVAL;
	425
	426	index = ptp_pin_name2index(ptp, attr->attr.name);
	427	if (index < 0)
	428	return -EINVAL;
	429
	430	if (mutex_lock_interruptible(&ptp->pincfg_mux))
	431	return -ERESTARTSYS;
	432	err = ptp_set_pinfunc(ptp, index, func, chan);
	433	mutex_unlock(&ptp->pincfg_mux);
	434	if (err)
	435	return err;
	436
	437	return count;
	438	}
	439
85a66e55	440	int ptp_populate_pin_groups(struct ptp_clock *ptp)
d94ba80e	441	{
653104d1 RC	442	struct ptp_clock_info *info = ptp->info;
	443	int err = -ENOMEM, i, n_pins = info->n_pins;
	444
85a66e55 DT	445	if (!n_pins)
	446	return 0;
	447
6f7aa56b	448	ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr),
653104d1 RC	449	GFP_KERNEL);
	450	if (!ptp->pin_dev_attr)
	451	goto no_dev_attr;
	452
6f7aa56b	453	ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL);
653104d1 RC	454	if (!ptp->pin_attr)
	455	goto no_pin_attr;
	456
	457	for (i = 0; i < n_pins; i++) {
	458	struct device_attribute *da = &ptp->pin_dev_attr[i];
	459	sysfs_attr_init(&da->attr);
	460	da->attr.name = info->pin_config[i].name;
	461	da->attr.mode = 0644;
	462	da->show = ptp_pin_show;
	463	da->store = ptp_pin_store;
	464	ptp->pin_attr[i] = &da->attr;
	465	}
	466
	467	ptp->pin_attr_group.name = "pins";
	468	ptp->pin_attr_group.attrs = ptp->pin_attr;
	469
85a66e55 DT	470	ptp->pin_attr_groups[0] = &ptp->pin_attr_group;
85a66e55 DT	471
653104d1 RC	472	return 0;
653104d1 RC	473
653104d1 RC	474	no_pin_attr:
	475	kfree(ptp->pin_dev_attr);
	476	no_dev_attr:
	477	return err;
	478	}
	479
85a66e55	480	void ptp_cleanup_pin_groups(struct ptp_clock *ptp)
d94ba80e	481	{
85a66e55 DT	482	kfree(ptp->pin_attr);
85a66e55 DT	483	kfree(ptp->pin_dev_attr);
d94ba80e	484	}