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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file provides /sys/class/ieee80211/<wiphy name>/
4 * and some default attributes.
5 *
6 * Copyright 2005-2006 Jiri Benc <[email protected]>
7 * Copyright 2006 Johannes Berg <[email protected]>
8 * Copyright (C) 2020-2021, 2023-2024 Intel Corporation
9 */
10
11#include <linux/device.h>
12#include <linux/module.h>
13#include <linux/netdevice.h>
14#include <linux/nl80211.h>
15#include <linux/rtnetlink.h>
16#include <net/cfg80211.h>
17#include "sysfs.h"
18#include "core.h"
19#include "rdev-ops.h"
20
21static inline struct cfg80211_registered_device *dev_to_rdev(
22 struct device *dev)
23{
24 return container_of(dev, struct cfg80211_registered_device, wiphy.dev);
25}
26
27#define SHOW_FMT(name, fmt, member) \
28static ssize_t name ## _show(struct device *dev, \
29 struct device_attribute *attr, \
30 char *buf) \
31{ \
32 return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member); \
33} \
34static DEVICE_ATTR_RO(name)
35
36SHOW_FMT(index, "%d", wiphy_idx);
37SHOW_FMT(macaddress, "%pM", wiphy.perm_addr);
38SHOW_FMT(address_mask, "%pM", wiphy.addr_mask);
39
40static ssize_t name_show(struct device *dev,
41 struct device_attribute *attr,
42 char *buf)
43{
44 struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
45
46 return sprintf(buf, "%s\n", wiphy_name(wiphy));
47}
48static DEVICE_ATTR_RO(name);
49
50static ssize_t addresses_show(struct device *dev,
51 struct device_attribute *attr,
52 char *buf)
53{
54 struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
55 char *start = buf;
56 int i;
57
58 if (!wiphy->addresses)
59 return sprintf(buf, "%pM\n", wiphy->perm_addr);
60
61 for (i = 0; i < wiphy->n_addresses; i++)
62 buf += sprintf(buf, "%pM\n", wiphy->addresses[i].addr);
63
64 return buf - start;
65}
66static DEVICE_ATTR_RO(addresses);
67
68static struct attribute *ieee80211_attrs[] = {
69 &dev_attr_index.attr,
70 &dev_attr_macaddress.attr,
71 &dev_attr_address_mask.attr,
72 &dev_attr_addresses.attr,
73 &dev_attr_name.attr,
74 NULL,
75};
76ATTRIBUTE_GROUPS(ieee80211);
77
78static void wiphy_dev_release(struct device *dev)
79{
80 struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
81
82 cfg80211_dev_free(rdev);
83}
84
85#ifdef CONFIG_PM_SLEEP
86static void cfg80211_leave_all(struct cfg80211_registered_device *rdev)
87{
88 struct wireless_dev *wdev;
89
90 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
91 cfg80211_leave(rdev, wdev, -1);
92}
93
94static int wiphy_suspend(struct device *dev)
95{
96 struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
97 int ret = 0;
98
99 rdev->suspend_at = ktime_get_boottime_seconds();
100
101 rtnl_lock();
102 if (!rdev->wiphy.registered)
103 goto out_unlock_rtnl;
104
105 if (rdev->wiphy.wowlan_config) {
106 scoped_guard(wiphy, &rdev->wiphy) {
107 cfg80211_process_wiphy_works(rdev, NULL);
108 if (rdev->ops->suspend)
109 ret = rdev_suspend(rdev,
110 rdev->wiphy.wowlan_config);
111 if (ret <= 0)
112 goto out_unlock_rtnl;
113 }
114 }
115
116 /* Driver refused to configure wowlan (ret = 1) or no wowlan */
117
118 cfg80211_leave_all(rdev);
119 scoped_guard(wiphy, &rdev->wiphy) {
120 cfg80211_process_rdev_events(rdev);
121 cfg80211_process_wiphy_works(rdev, NULL);
122 if (rdev->ops->suspend)
123 ret = rdev_suspend(rdev, NULL);
124 }
125out_unlock_rtnl:
126 if (ret == 0)
127 rdev->suspended = true;
128 rtnl_unlock();
129
130 return ret;
131}
132
133static int wiphy_resume(struct device *dev)
134{
135 struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
136 int ret = 0;
137
138 /* Age scan results with time spent in suspend */
139 cfg80211_bss_age(rdev, ktime_get_boottime_seconds() - rdev->suspend_at);
140
141 rtnl_lock();
142 wiphy_lock(&rdev->wiphy);
143 if (rdev->wiphy.registered && rdev->ops->resume)
144 ret = rdev_resume(rdev);
145 rdev->suspended = false;
146 queue_work(system_dfl_wq, &rdev->wiphy_work);
147 wiphy_unlock(&rdev->wiphy);
148
149 if (ret)
150 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
151
152 rtnl_unlock();
153
154 return ret;
155}
156
157static SIMPLE_DEV_PM_OPS(wiphy_pm_ops, wiphy_suspend, wiphy_resume);
158#define WIPHY_PM_OPS (&wiphy_pm_ops)
159#else
160#define WIPHY_PM_OPS NULL
161#endif
162
163static const struct ns_common *wiphy_namespace(const struct device *d)
164{
165 struct wiphy *wiphy = container_of(d, struct wiphy, dev);
166
167 return to_ns_common(wiphy_net(wiphy));
168}
169
170struct class ieee80211_class = {
171 .name = "ieee80211",
172 .dev_release = wiphy_dev_release,
173 .dev_groups = ieee80211_groups,
174 .pm = WIPHY_PM_OPS,
175 .ns_type = &net_ns_type_operations,
176 .namespace = wiphy_namespace,
177};
178
179int wiphy_sysfs_init(void)
180{
181 return class_register(&ieee80211_class);
182}
183
184void wiphy_sysfs_exit(void)
185{
186 class_unregister(&ieee80211_class);
187}