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 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 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 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