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9#include <linux/spinlock.h>
10#include <linux/export.h>
11#include <linux/proc_fs.h>
12#include <linux/init.h>
13#include <linux/poll.h>
14#include <linux/gfp.h>
15#include <acpi/acpi_drivers.h>
16#include <net/netlink.h>
17#include <net/genetlink.h>
18
19#include "internal.h"
20
21#define _COMPONENT ACPI_SYSTEM_COMPONENT
22ACPI_MODULE_NAME("event");
23
24
25static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
26
27int 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}
38EXPORT_SYMBOL(acpi_notifier_call_chain);
39
40int register_acpi_notifier(struct notifier_block *nb)
41{
42 return blocking_notifier_chain_register(&acpi_chain_head, nb);
43}
44EXPORT_SYMBOL(register_acpi_notifier);
45
46int unregister_acpi_notifier(struct notifier_block *nb)
47{
48 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
49}
50EXPORT_SYMBOL(unregister_acpi_notifier);
51
52#ifdef CONFIG_NET
53static unsigned int acpi_event_seqnum;
54struct acpi_genl_event {
55 acpi_device_class device_class;
56 char bus_id[15];
57 u32 type;
58 u32 data;
59};
60
61
62enum {
63 ACPI_GENL_ATTR_UNSPEC,
64 ACPI_GENL_ATTR_EVENT,
65 __ACPI_GENL_ATTR_MAX,
66};
67#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
68
69
70enum {
71 ACPI_GENL_CMD_UNSPEC,
72 ACPI_GENL_CMD_EVENT,
73 __ACPI_GENL_CMD_MAX,
74};
75#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
76
77#define ACPI_GENL_FAMILY_NAME "acpi_event"
78#define ACPI_GENL_VERSION 0x01
79#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
80
81static struct genl_family acpi_event_genl_family = {
82 .id = GENL_ID_GENERATE,
83 .name = ACPI_GENL_FAMILY_NAME,
84 .version = ACPI_GENL_VERSION,
85 .maxattr = ACPI_GENL_ATTR_MAX,
86};
87
88static struct genl_multicast_group acpi_event_mcgrp = {
89 .name = ACPI_GENL_MCAST_GROUP_NAME,
90};
91
92int acpi_bus_generate_netlink_event(const char *device_class,
93 const char *bus_id,
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
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
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
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
137 strcpy(event->device_class, device_class);
138 strcpy(event->bus_id, bus_id);
139 event->type = type;
140 event->data = data;
141
142
143 result = genlmsg_end(skb, msg_header);
144 if (result < 0) {
145 nlmsg_free(skb);
146 return result;
147 }
148
149 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
150 return 0;
151}
152
153EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
154
155static 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
163 result = genl_register_mc_group(&acpi_event_genl_family,
164 &acpi_event_mcgrp);
165 if (result)
166 genl_unregister_family(&acpi_event_genl_family);
167
168 return result;
169}
170
171#else
172int acpi_bus_generate_netlink_event(const char *device_class,
173 const char *bus_id,
174 u8 type, int data)
175{
176 return 0;
177}
178
179EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
180
181static int acpi_event_genetlink_init(void)
182{
183 return -ENODEV;
184}
185#endif
186
187static int __init acpi_event_init(void)
188{
189 int error = 0;
190
191 if (acpi_disabled)
192 return 0;
193
194
195 error = acpi_event_genetlink_init();
196 if (error)
197 printk(KERN_WARNING PREFIX
198 "Failed to create genetlink family for ACPI event\n");
199 return 0;
200}
201
202fs_initcall(acpi_event_init);
203
