1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * PPS generators sysfs support
4 *
5 * Copyright (C) 2024 Rodolfo Giometti <[email protected]>
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
system_show(struct device * dev,struct device_attribute * attr,char * buf)17 static 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 }
24 static DEVICE_ATTR_RO(system);
25
time_show(struct device * dev,struct device_attribute * attr,char * buf)26 static 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 }
39 static DEVICE_ATTR_RO(time);
40
enable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)41 static 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 }
59 static DEVICE_ATTR_WO(enable);
60
61 static struct attribute *pps_gen_attrs[] = {
62 &dev_attr_enable.attr,
63 &dev_attr_time.attr,
64 &dev_attr_system.attr,
65 NULL,
66 };
67
68 static const struct attribute_group pps_gen_group = {
69 .attrs = pps_gen_attrs,
70 };
71
72 const struct attribute_group *pps_gen_groups[] = {
73 &pps_gen_group,
74 NULL,
75 };
76