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1da177e4 LT |
1 | /* |
2 | * event.c - exporting ACPI events via procfs | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | */ | |
8 | ||
9 | #include <linux/spinlock.h> | |
214f2c90 | 10 | #include <linux/export.h> |
1da177e4 LT |
11 | #include <linux/proc_fs.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/poll.h> | |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
1da177e4 | 15 | #include <acpi/acpi_drivers.h> |
864bdfb9 ZR |
16 | #include <net/netlink.h> |
17 | #include <net/genetlink.h> | |
1da177e4 | 18 | |
a192a958 LB |
19 | #include "internal.h" |
20 | ||
1da177e4 | 21 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
f52fd66d | 22 | ACPI_MODULE_NAME("event"); |
1da177e4 | 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) | |
36 | == NOTIFY_BAD) ? -EINVAL : 0; | |
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 ZR |
80 | |
81 | static struct genl_family acpi_event_genl_family = { | |
82 | .id = GENL_ID_GENERATE, | |
9c977a45 | 83 | .name = ACPI_GENL_FAMILY_NAME, |
864bdfb9 ZR |
84 | .version = ACPI_GENL_VERSION, |
85 | .maxattr = ACPI_GENL_ATTR_MAX, | |
86 | }; | |
87 | ||
9c977a45 ZR |
88 | static struct genl_multicast_group acpi_event_mcgrp = { |
89 | .name = ACPI_GENL_MCAST_GROUP_NAME, | |
864bdfb9 ZR |
90 | }; |
91 | ||
962ce8ca ZR |
92 | int acpi_bus_generate_netlink_event(const char *device_class, |
93 | const char *bus_id, | |
864bdfb9 ZR |
94 | u8 type, int data) |
95 | { | |
96 | struct sk_buff *skb; | |
97 | struct nlattr *attr; | |
98 | struct acpi_genl_event *event; | |
99 | void *msg_header; | |
100 | int size; | |
101 | int result; | |
102 | ||
103 | /* allocate memory */ | |
104 | size = nla_total_size(sizeof(struct acpi_genl_event)) + | |
105 | nla_total_size(0); | |
106 | ||
107 | skb = genlmsg_new(size, GFP_ATOMIC); | |
108 | if (!skb) | |
109 | return -ENOMEM; | |
110 | ||
111 | /* add the genetlink message header */ | |
112 | msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++, | |
113 | &acpi_event_genl_family, 0, | |
114 | ACPI_GENL_CMD_EVENT); | |
115 | if (!msg_header) { | |
116 | nlmsg_free(skb); | |
117 | return -ENOMEM; | |
118 | } | |
119 | ||
120 | /* fill the data */ | |
121 | attr = | |
122 | nla_reserve(skb, ACPI_GENL_ATTR_EVENT, | |
123 | sizeof(struct acpi_genl_event)); | |
124 | if (!attr) { | |
125 | nlmsg_free(skb); | |
126 | return -EINVAL; | |
127 | } | |
128 | ||
129 | event = nla_data(attr); | |
130 | if (!event) { | |
131 | nlmsg_free(skb); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
135 | memset(event, 0, sizeof(struct acpi_genl_event)); | |
136 | ||
962ce8ca ZR |
137 | strcpy(event->device_class, device_class); |
138 | strcpy(event->bus_id, bus_id); | |
864bdfb9 ZR |
139 | event->type = type; |
140 | event->data = data; | |
141 | ||
142 | /* send multicast genetlink message */ | |
143 | result = genlmsg_end(skb, msg_header); | |
144 | if (result < 0) { | |
145 | nlmsg_free(skb); | |
146 | return result; | |
147 | } | |
148 | ||
ff491a73 | 149 | genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC); |
864bdfb9 ZR |
150 | return 0; |
151 | } | |
864bdfb9 | 152 | |
962ce8ca ZR |
153 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
154 | ||
864bdfb9 ZR |
155 | static int acpi_event_genetlink_init(void) |
156 | { | |
157 | int result; | |
158 | ||
159 | result = genl_register_family(&acpi_event_genl_family); | |
160 | if (result) | |
161 | return result; | |
162 | ||
9c977a45 ZR |
163 | result = genl_register_mc_group(&acpi_event_genl_family, |
164 | &acpi_event_mcgrp); | |
864bdfb9 ZR |
165 | if (result) |
166 | genl_unregister_family(&acpi_event_genl_family); | |
167 | ||
168 | return result; | |
169 | } | |
170 | ||
171 | #else | |
3e069ee0 LB |
172 | int acpi_bus_generate_netlink_event(const char *device_class, |
173 | const char *bus_id, | |
174 | u8 type, int data) | |
864bdfb9 ZR |
175 | { |
176 | return 0; | |
177 | } | |
864bdfb9 | 178 | |
66baf327 | 179 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
962ce8ca | 180 | |
864bdfb9 ZR |
181 | static int acpi_event_genetlink_init(void) |
182 | { | |
183 | return -ENODEV; | |
184 | } | |
185 | #endif | |
186 | ||
1da177e4 LT |
187 | static int __init acpi_event_init(void) |
188 | { | |
1da177e4 LT |
189 | int error = 0; |
190 | ||
1da177e4 | 191 | if (acpi_disabled) |
d550d98d | 192 | return 0; |
1da177e4 | 193 | |
864bdfb9 ZR |
194 | /* create genetlink for acpi event */ |
195 | error = acpi_event_genetlink_init(); | |
196 | if (error) | |
197 | printk(KERN_WARNING PREFIX | |
198 | "Failed to create genetlink family for ACPI event\n"); | |
864bdfb9 | 199 | return 0; |
1da177e4 LT |
200 | } |
201 | ||
864bdfb9 | 202 | fs_initcall(acpi_event_init); |