sysfs.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * PPS generators sysfs support
 4 *
 5 * Copyright (C) 2024 Rodolfo Giometti <giometti@enneenne.com>
 6 */
 7
 8#include <linux/device.h>
 9#include <linux/module.h>
10#include <linux/string.h>
11#include <linux/pps_gen_kernel.h>
12
13/*
14 * Attribute functions
15 */
16
17static ssize_t system_show(struct device *dev, struct device_attribute *attr,
18				char *buf)
19{
20	struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
21
22	return sysfs_emit(buf, "%d\n", pps_gen->info->use_system_clock);
23}
24static DEVICE_ATTR_RO(system);
25
26static ssize_t time_show(struct device *dev, struct device_attribute *attr,
27				char *buf)
28{
29	struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
30	struct timespec64 time;
31	int ret;
32
33	ret = pps_gen->info->get_time(pps_gen, &time);
34	if (ret)
35		return ret;
36
37	return sysfs_emit(buf, "%llu %09lu\n", time.tv_sec, time.tv_nsec);
38}
39static DEVICE_ATTR_RO(time);
40
41static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
42				const char *buf, size_t count)
43{
44	struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
45	bool status;
46	int ret;
47
48	ret = kstrtobool(buf, &status);
49	if (ret)
50		return ret;
51
52	ret = pps_gen->info->enable(pps_gen, status);
53	if (ret)
54		return ret;
55	pps_gen->enabled = status;
56
57	return count;
58}
59static DEVICE_ATTR_WO(enable);
60
61static struct attribute *pps_gen_attrs[] = {
62	&dev_attr_enable.attr,
63	&dev_attr_time.attr,
64	&dev_attr_system.attr,
65	NULL,
66};
67
68static const struct attribute_group pps_gen_group = {
69	.attrs = pps_gen_attrs,
70};
71
72const struct attribute_group *pps_gen_groups[] = {
73	&pps_gen_group,
74	NULL,
75};