Line data    Source code

       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           0 : wakeup_attr(active_count);
      34           0 : wakeup_attr(event_count);
      35           0 : wakeup_attr(wakeup_count);
      36           0 : wakeup_attr(expire_count);
      37             : 
      38           0 : static ssize_t active_time_ms_show(struct device *dev,
      39             :                                    struct device_attribute *attr, char *buf)
      40             : {
      41           0 :         struct wakeup_source *ws = dev_get_drvdata(dev);
      42           0 :         ktime_t active_time =
      43           0 :                 ws->active ? ktime_sub(ktime_get(), ws->last_time) : 0;
      44             : 
      45           0 :         return sysfs_emit(buf, "%lld\n", ktime_to_ms(active_time));
      46             : }
      47             : static DEVICE_ATTR_RO(active_time_ms);
      48             : 
      49           0 : static ssize_t total_time_ms_show(struct device *dev,
      50             :                                   struct device_attribute *attr, char *buf)
      51             : {
      52           0 :         struct wakeup_source *ws = dev_get_drvdata(dev);
      53             :         ktime_t active_time;
      54           0 :         ktime_t total_time = ws->total_time;
      55             : 
      56           0 :         if (ws->active) {
      57           0 :                 active_time = ktime_sub(ktime_get(), ws->last_time);
      58           0 :                 total_time = ktime_add(total_time, active_time);
      59             :         }
      60             : 
      61           0 :         return sysfs_emit(buf, "%lld\n", ktime_to_ms(total_time));
      62             : }
      63             : static DEVICE_ATTR_RO(total_time_ms);
      64             : 
      65           0 : static ssize_t max_time_ms_show(struct device *dev,
      66             :                                 struct device_attribute *attr, char *buf)
      67             : {
      68           0 :         struct wakeup_source *ws = dev_get_drvdata(dev);
      69             :         ktime_t active_time;
      70           0 :         ktime_t max_time = ws->max_time;
      71             : 
      72           0 :         if (ws->active) {
      73           0 :                 active_time = ktime_sub(ktime_get(), ws->last_time);
      74           0 :                 if (active_time > max_time)
      75           0 :                         max_time = active_time;
      76             :         }
      77             : 
      78           0 :         return sysfs_emit(buf, "%lld\n", ktime_to_ms(max_time));
      79             : }
      80             : static DEVICE_ATTR_RO(max_time_ms);
      81             : 
      82           0 : static ssize_t last_change_ms_show(struct device *dev,
      83             :                                    struct device_attribute *attr, char *buf)
      84             : {
      85           0 :         struct wakeup_source *ws = dev_get_drvdata(dev);
      86             : 
      87           0 :         return sysfs_emit(buf, "%lld\n", ktime_to_ms(ws->last_time));
      88             : }
      89             : static DEVICE_ATTR_RO(last_change_ms);
      90             : 
      91           0 : static ssize_t name_show(struct device *dev, struct device_attribute *attr,
      92             :                          char *buf)
      93             : {
      94           0 :         struct wakeup_source *ws = dev_get_drvdata(dev);
      95             : 
      96           0 :         return sysfs_emit(buf, "%s\n", ws->name);
      97             : }
      98             : static DEVICE_ATTR_RO(name);
      99             : 
     100           0 : static ssize_t prevent_suspend_time_ms_show(struct device *dev,
     101             :                                             struct device_attribute *attr,
     102             :                                             char *buf)
     103             : {
     104           0 :         struct wakeup_source *ws = dev_get_drvdata(dev);
     105           0 :         ktime_t prevent_sleep_time = ws->prevent_sleep_time;
     106             : 
     107           0 :         if (ws->active && ws->autosleep_enabled) {
     108           0 :                 prevent_sleep_time = ktime_add(prevent_sleep_time,
     109             :                         ktime_sub(ktime_get(), ws->start_prevent_time));
     110             :         }
     111             : 
     112           0 :         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           0 : static void device_create_release(struct device *dev)
     132             : {
     133           0 :         kfree(dev);
     134           0 : }
     135             : 
     136           0 : static struct device *wakeup_source_device_create(struct device *parent,
     137             :                                                   struct wakeup_source *ws)
     138             : {
     139           0 :         struct device *dev = NULL;
     140             :         int retval;
     141             : 
     142           0 :         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
     143           0 :         if (!dev) {
     144             :                 retval = -ENOMEM;
     145             :                 goto error;
     146             :         }
     147             : 
     148           0 :         device_initialize(dev);
     149           0 :         dev->devt = MKDEV(0, 0);
     150           0 :         dev->class = wakeup_class;
     151           0 :         dev->parent = parent;
     152           0 :         dev->groups = wakeup_source_groups;
     153           0 :         dev->release = device_create_release;
     154           0 :         dev_set_drvdata(dev, ws);
     155           0 :         device_set_pm_not_required(dev);
     156             : 
     157           0 :         retval = dev_set_name(dev, "wakeup%d", ws->id);
     158           0 :         if (retval)
     159             :                 goto error;
     160             : 
     161           0 :         retval = device_add(dev);
     162           0 :         if (retval)
     163             :                 goto error;
     164             : 
     165             :         return dev;
     166             : 
     167             : error:
     168           0 :         put_device(dev);
     169           0 :         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           0 : int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
     178             : {
     179             :         struct device *dev;
     180             : 
     181           0 :         dev = wakeup_source_device_create(parent, ws);
     182           0 :         if (IS_ERR(dev))
     183           0 :                 return PTR_ERR(dev);
     184           0 :         ws->dev = dev;
     185             : 
     186           0 :         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         540 : int pm_wakeup_source_sysfs_add(struct device *parent)
     195             : {
     196         540 :         if (!parent->power.wakeup || parent->power.wakeup->dev)
     197             :                 return 0;
     198             : 
     199           0 :         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           0 : void wakeup_source_sysfs_remove(struct wakeup_source *ws)
     207             : {
     208           0 :         device_unregister(ws->dev);
     209           0 : }
     210             : 
     211           1 : static int __init wakeup_sources_sysfs_init(void)
     212             : {
     213           1 :         wakeup_class = class_create("wakeup");
     214             : 
     215           2 :         return PTR_ERR_OR_ZERO(wakeup_class);
     216             : }
     217             : postcore_initcall(wakeup_sources_sysfs_init);