Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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};