2 * event.c - exporting ACPI events via procfs
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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 <linux/acpi.h>
16 #include <net/netlink.h>
17 #include <net/genetlink.h>
21 #define _COMPONENT ACPI_SYSTEM_COMPONENT
22 ACPI_MODULE_NAME("event");
24 /* ACPI notifier chain */
25 static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
27 int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
29 struct acpi_bus_event event;
31 strcpy(event.device_class, dev->pnp.device_class);
32 strcpy(event.bus_id, dev->pnp.bus_id);
35 return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
36 == NOTIFY_BAD) ? -EINVAL : 0;
38 EXPORT_SYMBOL(acpi_notifier_call_chain);
40 int register_acpi_notifier(struct notifier_block *nb)
42 return blocking_notifier_chain_register(&acpi_chain_head, nb);
44 EXPORT_SYMBOL(register_acpi_notifier);
46 int unregister_acpi_notifier(struct notifier_block *nb)
48 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
50 EXPORT_SYMBOL(unregister_acpi_notifier);
53 static unsigned int acpi_event_seqnum;
54 struct acpi_genl_event {
55 acpi_device_class device_class;
61 /* attributes of acpi_genl_family */
63 ACPI_GENL_ATTR_UNSPEC,
64 ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
67 #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
69 /* commands supported by the acpi_genl_family */
72 ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
75 #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
77 #define ACPI_GENL_FAMILY_NAME "acpi_event"
78 #define ACPI_GENL_VERSION 0x01
79 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
81 static const struct genl_multicast_group acpi_event_mcgrps[] = {
82 { .name = ACPI_GENL_MCAST_GROUP_NAME, },
85 static struct genl_family acpi_event_genl_family = {
86 .id = GENL_ID_GENERATE,
87 .name = ACPI_GENL_FAMILY_NAME,
88 .version = ACPI_GENL_VERSION,
89 .maxattr = ACPI_GENL_ATTR_MAX,
90 .mcgrps = acpi_event_mcgrps,
91 .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
94 int acpi_bus_generate_netlink_event(const char *device_class,
100 struct acpi_genl_event *event;
104 /* allocate memory */
105 size = nla_total_size(sizeof(struct acpi_genl_event)) +
108 skb = genlmsg_new(size, GFP_ATOMIC);
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);
123 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
124 sizeof(struct acpi_genl_event));
130 event = nla_data(attr);
131 memset(event, 0, sizeof(struct acpi_genl_event));
133 strcpy(event->device_class, device_class);
134 strcpy(event->bus_id, bus_id);
138 /* send multicast genetlink message */
139 genlmsg_end(skb, msg_header);
141 genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
145 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
147 static int acpi_event_genetlink_init(void)
149 return genl_register_family(&acpi_event_genl_family);
153 int acpi_bus_generate_netlink_event(const char *device_class,
160 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
162 static int acpi_event_genetlink_init(void)
168 static int __init acpi_event_init(void)
175 /* create genetlink for acpi event */
176 error = acpi_event_genetlink_init();
178 printk(KERN_WARNING PREFIX
179 "Failed to create genetlink family for ACPI event\n");
183 fs_initcall(acpi_event_init);