drivers/ptp/ptp_sysfs.c - pub/scm/linux/kernel/git/kbingham/rcar - Git at Google

 /*
  * PTP 1588 clock support - sysfs interface.
  *
  * 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/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 snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name);
 }
 static DEVICE_ATTR(clock_name, 0444, clock_name_show, NULL);

 #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 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,
 	NULL,
 };

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

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


 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 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 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 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 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 snprintf(page, PAGE_SIZE, "%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;
 }

 static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
 static DEVICE_ATTR(fifo,         0444, extts_fifo_show, NULL);
 static DEVICE_ATTR(period,       0220, NULL, period_store);
 static DEVICE_ATTR(pps_enable,   0220, NULL, pps_enable_store);

 int ptp_cleanup_sysfs(struct ptp_clock *ptp)
 {
 	struct device *dev = ptp->dev;
 	struct ptp_clock_info *info = ptp->info;

 	if (info->n_ext_ts) {
 		device_remove_file(dev, &dev_attr_extts_enable);
 		device_remove_file(dev, &dev_attr_fifo);
 	}
 	if (info->n_per_out)
 		device_remove_file(dev, &dev_attr_period);

 	if (info->pps)
 		device_remove_file(dev, &dev_attr_pps_enable);

 	if (info->n_pins) {
 		sysfs_remove_group(&dev->kobj, &ptp->pin_attr_group);
 		kfree(ptp->pin_attr);
 		kfree(ptp->pin_dev_attr);
 	}
 	return 0;
 }

 static int ptp_populate_pins(struct ptp_clock *ptp)
 {
 	struct device *dev = ptp->dev;
 	struct ptp_clock_info *info = ptp->info;
 	int err = -ENOMEM, i, n_pins = info->n_pins;

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

 	ptp->pin_attr = kzalloc((1 + n_pins) * sizeof(struct attribute *),
 				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;

 	err = sysfs_create_group(&dev->kobj, &ptp->pin_attr_group);
 	if (err)
 		goto no_group;
 	return 0;

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

 int ptp_populate_sysfs(struct ptp_clock *ptp)
 {
 	struct device *dev = ptp->dev;
 	struct ptp_clock_info *info = ptp->info;
 	int err;

 	if (info->n_ext_ts) {
 		err = device_create_file(dev, &dev_attr_extts_enable);
 		if (err)
 			goto out1;
 		err = device_create_file(dev, &dev_attr_fifo);
 		if (err)
 			goto out2;
 	}
 	if (info->n_per_out) {
 		err = device_create_file(dev, &dev_attr_period);
 		if (err)
 			goto out3;
 	}
 	if (info->pps) {
 		err = device_create_file(dev, &dev_attr_pps_enable);
 		if (err)
 			goto out4;
 	}
 	if (info->n_pins) {
 		err = ptp_populate_pins(ptp);
 		if (err)
 			goto out5;
 	}
 	return 0;
 out5:
 	if (info->pps)
 		device_remove_file(dev, &dev_attr_pps_enable);
 out4:
 	if (info->n_per_out)
 		device_remove_file(dev, &dev_attr_period);
 out3:
 	if (info->n_ext_ts)
 		device_remove_file(dev, &dev_attr_fifo);
 out2:
 	if (info->n_ext_ts)
 		device_remove_file(dev, &dev_attr_extts_enable);
 out1:
 	return err;
 }
	/*
	* PTP 1588 clock support - sysfs interface.
	*
	* 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/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 snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name);
	}
	static DEVICE_ATTR(clock_name, 0444, clock_name_show, NULL);

	#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 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,
	NULL,
	};

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

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


	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 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 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 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 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 snprintf(page, PAGE_SIZE, "%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;
	}

	static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
	static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
	static DEVICE_ATTR(period, 0220, NULL, period_store);
	static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);

	int ptp_cleanup_sysfs(struct ptp_clock *ptp)
	{
	struct device *dev = ptp->dev;
	struct ptp_clock_info *info = ptp->info;

	if (info->n_ext_ts) {
	device_remove_file(dev, &dev_attr_extts_enable);
	device_remove_file(dev, &dev_attr_fifo);
	}
	if (info->n_per_out)
	device_remove_file(dev, &dev_attr_period);

	if (info->pps)
	device_remove_file(dev, &dev_attr_pps_enable);

	if (info->n_pins) {
	sysfs_remove_group(&dev->kobj, &ptp->pin_attr_group);
	kfree(ptp->pin_attr);
	kfree(ptp->pin_dev_attr);
	}
	return 0;
	}

	static int ptp_populate_pins(struct ptp_clock *ptp)
	{
	struct device *dev = ptp->dev;
	struct ptp_clock_info *info = ptp->info;
	int err = -ENOMEM, i, n_pins = info->n_pins;

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

	ptp->pin_attr = kzalloc((1 + n_pins) * sizeof(struct attribute *),
	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;

	err = sysfs_create_group(&dev->kobj, &ptp->pin_attr_group);
	if (err)
	goto no_group;
	return 0;

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

	int ptp_populate_sysfs(struct ptp_clock *ptp)
	{
	struct device *dev = ptp->dev;
	struct ptp_clock_info *info = ptp->info;
	int err;

	if (info->n_ext_ts) {
	err = device_create_file(dev, &dev_attr_extts_enable);
	if (err)
	goto out1;
	err = device_create_file(dev, &dev_attr_fifo);
	if (err)
	goto out2;
	}
	if (info->n_per_out) {
	err = device_create_file(dev, &dev_attr_period);
	if (err)
	goto out3;
	}
	if (info->pps) {
	err = device_create_file(dev, &dev_attr_pps_enable);
	if (err)
	goto out4;
	}
	if (info->n_pins) {
	err = ptp_populate_pins(ptp);
	if (err)
	goto out5;
	}
	return 0;
	out5:
	if (info->pps)
	device_remove_file(dev, &dev_attr_pps_enable);
	out4:
	if (info->n_per_out)
	device_remove_file(dev, &dev_attr_period);
	out3:
	if (info->n_ext_ts)
	device_remove_file(dev, &dev_attr_fifo);
	out2:
	if (info->n_ext_ts)
	device_remove_file(dev, &dev_attr_extts_enable);
	out1:
	return err;
	}