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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Paul Gortmaker214f2c92011-10-26 16:22:14 -040010#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/proc_fs.h>
12#include <linux/init.h>
13#include <linux/poll.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <acpi/acpi_drivers.h>
Zhang Rui864bdfb2007-06-19 11:40:03 +080016#include <net/netlink.h>
17#include <net/genetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Len Browna192a952009-07-28 16:45:54 -040019#include "internal.h"
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#define _COMPONENT ACPI_SYSTEM_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050022ACPI_MODULE_NAME("event");
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Zhang Rui9ee85242008-01-25 14:48:06 +080024/* ACPI notifier chain */
Adrian Bunkc8e773f2008-02-13 23:29:57 +020025static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
Zhang Rui9ee85242008-01-25 14:48:06 +080026
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
Zhang Rui864bdfb2007-06-19 11:40:03 +080052#ifdef CONFIG_NET
Adrian Bunke13d8742007-08-10 13:45:18 -070053static unsigned int acpi_event_seqnum;
Zhang Rui864bdfb2007-06-19 11:40:03 +080054struct 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 */
62enum {
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 */
70enum {
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
Zhang Rui9c977a42007-07-20 16:41:14 +080077#define ACPI_GENL_FAMILY_NAME "acpi_event"
78#define ACPI_GENL_VERSION 0x01
79#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
Zhang Rui864bdfb2007-06-19 11:40:03 +080080
Johannes Berg2a94fe42013-11-19 15:19:39 +010081static const struct genl_multicast_group acpi_event_mcgrps[] = {
82 { .name = ACPI_GENL_MCAST_GROUP_NAME, },
83};
84
Zhang Rui864bdfb2007-06-19 11:40:03 +080085static struct genl_family acpi_event_genl_family = {
86 .id = GENL_ID_GENERATE,
Zhang Rui9c977a42007-07-20 16:41:14 +080087 .name = ACPI_GENL_FAMILY_NAME,
Zhang Rui864bdfb2007-06-19 11:40:03 +080088 .version = ACPI_GENL_VERSION,
89 .maxattr = ACPI_GENL_ATTR_MAX,
Johannes Berg2a94fe42013-11-19 15:19:39 +010090 .mcgrps = acpi_event_mcgrps,
91 .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
Zhang Rui864bdfb2007-06-19 11:40:03 +080092};
93
Zhang Rui962ce8c2007-08-23 01:24:31 +080094int acpi_bus_generate_netlink_event(const char *device_class,
95 const char *bus_id,
Zhang Rui864bdfb2007-06-19 11:40:03 +080096 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;
103 int result;
104
105 /* allocate memory */
106 size = nla_total_size(sizeof(struct acpi_genl_event)) +
107 nla_total_size(0);
108
109 skb = genlmsg_new(size, GFP_ATOMIC);
110 if (!skb)
111 return -ENOMEM;
112
113 /* add the genetlink message header */
114 msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
115 &acpi_event_genl_family, 0,
116 ACPI_GENL_CMD_EVENT);
117 if (!msg_header) {
118 nlmsg_free(skb);
119 return -ENOMEM;
120 }
121
122 /* fill the data */
123 attr =
124 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
125 sizeof(struct acpi_genl_event));
126 if (!attr) {
127 nlmsg_free(skb);
128 return -EINVAL;
129 }
130
131 event = nla_data(attr);
Zhang Rui864bdfb2007-06-19 11:40:03 +0800132 memset(event, 0, sizeof(struct acpi_genl_event));
133
Zhang Rui962ce8c2007-08-23 01:24:31 +0800134 strcpy(event->device_class, device_class);
135 strcpy(event->bus_id, bus_id);
Zhang Rui864bdfb2007-06-19 11:40:03 +0800136 event->type = type;
137 event->data = data;
138
139 /* send multicast genetlink message */
140 result = genlmsg_end(skb, msg_header);
141 if (result < 0) {
142 nlmsg_free(skb);
143 return result;
144 }
145
Johannes Berg2a94fe42013-11-19 15:19:39 +0100146 genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
Zhang Rui864bdfb2007-06-19 11:40:03 +0800147 return 0;
148}
Zhang Rui864bdfb2007-06-19 11:40:03 +0800149
Zhang Rui962ce8c2007-08-23 01:24:31 +0800150EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
151
Zhang Rui864bdfb2007-06-19 11:40:03 +0800152static int acpi_event_genetlink_init(void)
153{
Johannes Berg2a94fe42013-11-19 15:19:39 +0100154 return genl_register_family(&acpi_event_genl_family);
Zhang Rui864bdfb2007-06-19 11:40:03 +0800155}
156
157#else
Len Brown3e069ee2007-08-24 03:06:33 -0400158int acpi_bus_generate_netlink_event(const char *device_class,
159 const char *bus_id,
160 u8 type, int data)
Zhang Rui864bdfb2007-06-19 11:40:03 +0800161{
162 return 0;
163}
Zhang Rui864bdfb2007-06-19 11:40:03 +0800164
Henrique de Moraes Holschuh66baf322007-09-03 00:03:35 -0300165EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800166
Zhang Rui864bdfb2007-06-19 11:40:03 +0800167static int acpi_event_genetlink_init(void)
168{
169 return -ENODEV;
170}
171#endif
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173static int __init acpi_event_init(void)
174{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 int error = 0;
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400178 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Zhang Rui864bdfb2007-06-19 11:40:03 +0800180 /* create genetlink for acpi event */
181 error = acpi_event_genetlink_init();
182 if (error)
183 printk(KERN_WARNING PREFIX
184 "Failed to create genetlink family for ACPI event\n");
Zhang Rui864bdfb2007-06-19 11:40:03 +0800185 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Zhang Rui864bdfb2007-06-19 11:40:03 +0800188fs_initcall(acpi_event_init);