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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * event.c - exporting ACPI events via procfs | |
4 | * | |
5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
7 | * | |
8 | */ | |
9 | ||
ad319565 HG |
10 | #define pr_fmt(fmt) "ACPI: " fmt |
11 | ||
1da177e4 | 12 | #include <linux/spinlock.h> |
214f2c90 | 13 | #include <linux/export.h> |
1da177e4 LT |
14 | #include <linux/proc_fs.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/poll.h> | |
5a0e3ad6 | 17 | #include <linux/gfp.h> |
8b48463f | 18 | #include <linux/acpi.h> |
864bdfb9 ZR |
19 | #include <net/netlink.h> |
20 | #include <net/genetlink.h> | |
1da177e4 | 21 | |
a192a958 LB |
22 | #include "internal.h" |
23 | ||
9ee85241 | 24 | /* ACPI notifier chain */ |
c8e773fa | 25 | static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); |
9ee85241 ZR |
26 | |
27 | int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data) | |
28 | { | |
29 | struct acpi_bus_event event; | |
30 | ||
31 | strcpy(event.device_class, dev->pnp.device_class); | |
32 | strcpy(event.bus_id, dev->pnp.bus_id); | |
33 | event.type = type; | |
34 | event.data = data; | |
35 | return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event) | |
c6237b21 | 36 | == NOTIFY_BAD) ? -EINVAL : 0; |
9ee85241 ZR |
37 | } |
38 | EXPORT_SYMBOL(acpi_notifier_call_chain); | |
39 | ||
40 | int register_acpi_notifier(struct notifier_block *nb) | |
41 | { | |
42 | return blocking_notifier_chain_register(&acpi_chain_head, nb); | |
43 | } | |
44 | EXPORT_SYMBOL(register_acpi_notifier); | |
45 | ||
46 | int unregister_acpi_notifier(struct notifier_block *nb) | |
47 | { | |
48 | return blocking_notifier_chain_unregister(&acpi_chain_head, nb); | |
49 | } | |
50 | EXPORT_SYMBOL(unregister_acpi_notifier); | |
51 | ||
864bdfb9 | 52 | #ifdef CONFIG_NET |
e13d8747 | 53 | static unsigned int acpi_event_seqnum; |
864bdfb9 ZR |
54 | struct acpi_genl_event { |
55 | acpi_device_class device_class; | |
56 | char bus_id[15]; | |
57 | u32 type; | |
58 | u32 data; | |
59 | }; | |
60 | ||
61 | /* attributes of acpi_genl_family */ | |
62 | enum { | |
63 | ACPI_GENL_ATTR_UNSPEC, | |
64 | ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ | |
65 | __ACPI_GENL_ATTR_MAX, | |
66 | }; | |
67 | #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) | |
68 | ||
69 | /* commands supported by the acpi_genl_family */ | |
70 | enum { | |
71 | ACPI_GENL_CMD_UNSPEC, | |
72 | ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ | |
73 | __ACPI_GENL_CMD_MAX, | |
74 | }; | |
75 | #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) | |
76 | ||
9c977a45 ZR |
77 | #define ACPI_GENL_FAMILY_NAME "acpi_event" |
78 | #define ACPI_GENL_VERSION 0x01 | |
79 | #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" | |
864bdfb9 | 80 | |
2a94fe48 JB |
81 | static const struct genl_multicast_group acpi_event_mcgrps[] = { |
82 | { .name = ACPI_GENL_MCAST_GROUP_NAME, }, | |
83 | }; | |
84 | ||
56989f6d | 85 | static struct genl_family acpi_event_genl_family __ro_after_init = { |
489111e5 | 86 | .module = THIS_MODULE, |
9c977a45 | 87 | .name = ACPI_GENL_FAMILY_NAME, |
864bdfb9 ZR |
88 | .version = ACPI_GENL_VERSION, |
89 | .maxattr = ACPI_GENL_ATTR_MAX, | |
2a94fe48 JB |
90 | .mcgrps = acpi_event_mcgrps, |
91 | .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps), | |
864bdfb9 ZR |
92 | }; |
93 | ||
962ce8ca ZR |
94 | int acpi_bus_generate_netlink_event(const char *device_class, |
95 | const char *bus_id, | |
864bdfb9 ZR |
96 | u8 type, int data) |
97 | { | |
98 | struct sk_buff *skb; | |
99 | struct nlattr *attr; | |
100 | struct acpi_genl_event *event; | |
101 | void *msg_header; | |
102 | int size; | |
864bdfb9 ZR |
103 | |
104 | /* allocate memory */ | |
105 | size = nla_total_size(sizeof(struct acpi_genl_event)) + | |
106 | nla_total_size(0); | |
107 | ||
108 | skb = genlmsg_new(size, GFP_ATOMIC); | |
109 | if (!skb) | |
110 | return -ENOMEM; | |
111 | ||
112 | /* add the genetlink message header */ | |
113 | msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++, | |
114 | &acpi_event_genl_family, 0, | |
115 | ACPI_GENL_CMD_EVENT); | |
116 | if (!msg_header) { | |
117 | nlmsg_free(skb); | |
118 | return -ENOMEM; | |
119 | } | |
120 | ||
121 | /* fill the data */ | |
122 | attr = | |
123 | nla_reserve(skb, ACPI_GENL_ATTR_EVENT, | |
124 | sizeof(struct acpi_genl_event)); | |
125 | if (!attr) { | |
126 | nlmsg_free(skb); | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | event = nla_data(attr); | |
864bdfb9 ZR |
131 | memset(event, 0, sizeof(struct acpi_genl_event)); |
132 | ||
c7d5f21e GS |
133 | strscpy(event->device_class, device_class, sizeof(event->device_class)); |
134 | strscpy(event->bus_id, bus_id, sizeof(event->bus_id)); | |
864bdfb9 ZR |
135 | event->type = type; |
136 | event->data = data; | |
137 | ||
138 | /* send multicast genetlink message */ | |
053c095a | 139 | genlmsg_end(skb, msg_header); |
864bdfb9 | 140 | |
2a94fe48 | 141 | genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC); |
864bdfb9 ZR |
142 | return 0; |
143 | } | |
864bdfb9 | 144 | |
962ce8ca ZR |
145 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
146 | ||
56989f6d | 147 | static int __init acpi_event_genetlink_init(void) |
864bdfb9 | 148 | { |
2a94fe48 | 149 | return genl_register_family(&acpi_event_genl_family); |
864bdfb9 ZR |
150 | } |
151 | ||
152 | #else | |
3e069ee0 LB |
153 | int acpi_bus_generate_netlink_event(const char *device_class, |
154 | const char *bus_id, | |
155 | u8 type, int data) | |
864bdfb9 ZR |
156 | { |
157 | return 0; | |
158 | } | |
864bdfb9 | 159 | |
66baf327 | 160 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
962ce8ca | 161 | |
864bdfb9 ZR |
162 | static int acpi_event_genetlink_init(void) |
163 | { | |
164 | return -ENODEV; | |
165 | } | |
166 | #endif | |
167 | ||
1da177e4 LT |
168 | static int __init acpi_event_init(void) |
169 | { | |
f00d2d32 | 170 | int error; |
1da177e4 | 171 | |
1da177e4 | 172 | if (acpi_disabled) |
d550d98d | 173 | return 0; |
1da177e4 | 174 | |
864bdfb9 ZR |
175 | /* create genetlink for acpi event */ |
176 | error = acpi_event_genetlink_init(); | |
177 | if (error) | |
ad319565 HG |
178 | pr_warn("Failed to create genetlink family for ACPI event\n"); |
179 | ||
864bdfb9 | 180 | return 0; |
1da177e4 LT |
181 | } |
182 | ||
864bdfb9 | 183 | fs_initcall(acpi_event_init); |