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 <jbenc@suse.cz>
7 * Copyright 2006	Johannes Berg <johannes@sipsolutions.net>
8 * Copyright (C) 2020-2021, 2023 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);
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	wiphy_lock(&rdev->wiphy);
103	if (rdev->wiphy.registered) {
104		if (!rdev->wiphy.wowlan_config) {
105			cfg80211_leave_all(rdev);
106			cfg80211_process_rdev_events(rdev);
107		}
108		cfg80211_process_wiphy_works(rdev, NULL);
109		if (rdev->ops->suspend)
110			ret = rdev_suspend(rdev, rdev->wiphy.wowlan_config);
111		if (ret == 1) {
112			/* Driver refuse to configure wowlan */
113			cfg80211_leave_all(rdev);
114			cfg80211_process_rdev_events(rdev);
115			cfg80211_process_wiphy_works(rdev, NULL);
116			ret = rdev_suspend(rdev, NULL);
117		}
118		if (ret == 0)
119			rdev->suspended = true;
120	}
121	wiphy_unlock(&rdev->wiphy);
122	rtnl_unlock();
123
124	return ret;
125}
126
127static int wiphy_resume(struct device *dev)
128{
129	struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
130	int ret = 0;
131
132	/* Age scan results with time spent in suspend */
133	cfg80211_bss_age(rdev, ktime_get_boottime_seconds() - rdev->suspend_at);
134
135	rtnl_lock();
136	wiphy_lock(&rdev->wiphy);
137	if (rdev->wiphy.registered && rdev->ops->resume)
138		ret = rdev_resume(rdev);
139	rdev->suspended = false;
140	schedule_work(&rdev->wiphy_work);
141	wiphy_unlock(&rdev->wiphy);
142
143	if (ret)
144		cfg80211_shutdown_all_interfaces(&rdev->wiphy);
145
146	rtnl_unlock();
147
148	return ret;
149}
150
151static SIMPLE_DEV_PM_OPS(wiphy_pm_ops, wiphy_suspend, wiphy_resume);
152#define WIPHY_PM_OPS (&wiphy_pm_ops)
153#else
154#define WIPHY_PM_OPS NULL
155#endif
156
157static const void *wiphy_namespace(const struct device *d)
158{
159	struct wiphy *wiphy = container_of(d, struct wiphy, dev);
160
161	return wiphy_net(wiphy);
162}
163
164struct class ieee80211_class = {
165	.name = "ieee80211",
166	.dev_release = wiphy_dev_release,
167	.dev_groups = ieee80211_groups,
168	.pm = WIPHY_PM_OPS,
169	.ns_type = &net_ns_type_operations,
170	.namespace = wiphy_namespace,
171};
172
173int wiphy_sysfs_init(void)
174{
175	return class_register(&ieee80211_class);
176}
177
178void wiphy_sysfs_exit(void)
179{
180	class_unregister(&ieee80211_class);
181}
182