1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Wakeup statistics in sysfs 4 * 5 * Copyright (c) 2019 Linux Foundation 6 * Copyright (c) 2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> 7 * Copyright (c) 2019 Google Inc. 8 */ 9 10 #include <linux/device.h> 11 #include <linux/idr.h> 12 #include <linux/init.h> 13 #include <linux/kdev_t.h> 14 #include <linux/kernel.h> 15 #include <linux/kobject.h> 16 #include <linux/slab.h> 17 #include <linux/timekeeping.h> 18 19 #include "power.h" 20 21 static struct class *wakeup_class; 22 23 #define wakeup_attr(_name) \ 24 static ssize_t _name##_show(struct device *dev, \ 25 struct device_attribute *attr, char *buf) \ 26 { \ 27 struct wakeup_source *ws = dev_get_drvdata(dev); \ 28 \ 29 return sysfs_emit(buf, "%lu\n", ws->_name); \ 30 } \ 31 static DEVICE_ATTR_RO(_name) 32 33 wakeup_attr(active_count); 34 wakeup_attr(event_count); 35 wakeup_attr(wakeup_count); 36 wakeup_attr(expire_count); 37 38 static ssize_t active_time_ms_show(struct device *dev, 39 struct device_attribute *attr, char *buf) 40 { 41 struct wakeup_source *ws = dev_get_drvdata(dev); 42 ktime_t active_time = 43 ws->active ? ktime_sub(ktime_get(), ws->last_time) : 0; 44 45 return sysfs_emit(buf, "%lld\n", ktime_to_ms(active_time)); 46 } 47 static DEVICE_ATTR_RO(active_time_ms); 48 49 static ssize_t total_time_ms_show(struct device *dev, 50 struct device_attribute *attr, char *buf) 51 { 52 struct wakeup_source *ws = dev_get_drvdata(dev); 53 ktime_t active_time; 54 ktime_t total_time = ws->total_time; 55 56 if (ws->active) { 57 active_time = ktime_sub(ktime_get(), ws->last_time); 58 total_time = ktime_add(total_time, active_time); 59 } 60 61 return sysfs_emit(buf, "%lld\n", ktime_to_ms(total_time)); 62 } 63 static DEVICE_ATTR_RO(total_time_ms); 64 65 static ssize_t max_time_ms_show(struct device *dev, 66 struct device_attribute *attr, char *buf) 67 { 68 struct wakeup_source *ws = dev_get_drvdata(dev); 69 ktime_t active_time; 70 ktime_t max_time = ws->max_time; 71 72 if (ws->active) { 73 active_time = ktime_sub(ktime_get(), ws->last_time); 74 if (active_time > max_time) 75 max_time = active_time; 76 } 77 78 return sysfs_emit(buf, "%lld\n", ktime_to_ms(max_time)); 79 } 80 static DEVICE_ATTR_RO(max_time_ms); 81 82 static ssize_t last_change_ms_show(struct device *dev, 83 struct device_attribute *attr, char *buf) 84 { 85 struct wakeup_source *ws = dev_get_drvdata(dev); 86 87 return sysfs_emit(buf, "%lld\n", ktime_to_ms(ws->last_time)); 88 } 89 static DEVICE_ATTR_RO(last_change_ms); 90 91 static ssize_t name_show(struct device *dev, struct device_attribute *attr, 92 char *buf) 93 { 94 struct wakeup_source *ws = dev_get_drvdata(dev); 95 96 return sysfs_emit(buf, "%s\n", ws->name); 97 } 98 static DEVICE_ATTR_RO(name); 99 100 static ssize_t prevent_suspend_time_ms_show(struct device *dev, 101 struct device_attribute *attr, 102 char *buf) 103 { 104 struct wakeup_source *ws = dev_get_drvdata(dev); 105 ktime_t prevent_sleep_time = ws->prevent_sleep_time; 106 107 if (ws->active && ws->autosleep_enabled) { 108 prevent_sleep_time = ktime_add(prevent_sleep_time, 109 ktime_sub(ktime_get(), ws->start_prevent_time)); 110 } 111 112 return sysfs_emit(buf, "%lld\n", ktime_to_ms(prevent_sleep_time)); 113 } 114 static DEVICE_ATTR_RO(prevent_suspend_time_ms); 115 116 static struct attribute *wakeup_source_attrs[] = { 117 &dev_attr_name.attr, 118 &dev_attr_active_count.attr, 119 &dev_attr_event_count.attr, 120 &dev_attr_wakeup_count.attr, 121 &dev_attr_expire_count.attr, 122 &dev_attr_active_time_ms.attr, 123 &dev_attr_total_time_ms.attr, 124 &dev_attr_max_time_ms.attr, 125 &dev_attr_last_change_ms.attr, 126 &dev_attr_prevent_suspend_time_ms.attr, 127 NULL, 128 }; 129 ATTRIBUTE_GROUPS(wakeup_source); 130 131 static void device_create_release(struct device *dev) 132 { 133 kfree(dev); 134 } 135 136 static struct device *wakeup_source_device_create(struct device *parent, 137 struct wakeup_source *ws) 138 { 139 struct device *dev = NULL; 140 int retval = -ENODEV; 141 142 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 143 if (!dev) { 144 retval = -ENOMEM; 145 goto error; 146 } 147 148 device_initialize(dev); 149 dev->devt = MKDEV(0, 0); 150 dev->class = wakeup_class; 151 dev->parent = parent; 152 dev->groups = wakeup_source_groups; 153 dev->release = device_create_release; 154 dev_set_drvdata(dev, ws); 155 device_set_pm_not_required(dev); 156 157 retval = kobject_set_name(&dev->kobj, "wakeup%d", ws->id); 158 if (retval) 159 goto error; 160 161 retval = device_add(dev); 162 if (retval) 163 goto error; 164 165 return dev; 166 167 error: 168 put_device(dev); 169 return ERR_PTR(retval); 170 } 171 172 /** 173 * wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs. 174 * @parent: Device given wakeup source is associated with (or NULL if virtual). 175 * @ws: Wakeup source to be added in sysfs. 176 */ 177 int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws) 178 { 179 struct device *dev; 180 181 dev = wakeup_source_device_create(parent, ws); 182 if (IS_ERR(dev)) 183 return PTR_ERR(dev); 184 ws->dev = dev; 185 186 return 0; 187 } 188 189 /** 190 * pm_wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs 191 * for a device if they're missing. 192 * @parent: Device given wakeup source is associated with 193 */ 194 int pm_wakeup_source_sysfs_add(struct device *parent) 195 { 196 if (!parent->power.wakeup || parent->power.wakeup->dev) 197 return 0; 198 199 return wakeup_source_sysfs_add(parent, parent->power.wakeup); 200 } 201 202 /** 203 * wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs. 204 * @ws: Wakeup source to be removed from sysfs. 205 */ 206 void wakeup_source_sysfs_remove(struct wakeup_source *ws) 207 { 208 device_unregister(ws->dev); 209 } 210 211 static int __init wakeup_sources_sysfs_init(void) 212 { 213 wakeup_class = class_create(THIS_MODULE, "wakeup"); 214 215 return PTR_ERR_OR_ZERO(wakeup_class); 216 } 217 postcore_initcall(wakeup_sources_sysfs_init); 218