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/proc_fs.h>
11 #include <linux/init.h>
12 #include <linux/poll.h>
13 #include <linux/gfp.h>
14 #include <acpi/acpi_drivers.h>
15 #include <net/netlink.h>
16 #include <net/genetlink.h>
20 #define _COMPONENT ACPI_SYSTEM_COMPONENT
21 ACPI_MODULE_NAME("event");
23 #ifdef CONFIG_ACPI_PROC_EVENT
24 /* Global vars for handling event proc entry */
25 static DEFINE_SPINLOCK(acpi_system_event_lock);
26 int event_is_open = 0;
27 extern struct list_head acpi_bus_event_list;
28 extern wait_queue_head_t acpi_bus_event_queue;
30 static int acpi_system_open_event(struct inode *inode, struct file *file)
32 spin_lock_irq(&acpi_system_event_lock);
39 spin_unlock_irq(&acpi_system_event_lock);
43 spin_unlock_irq(&acpi_system_event_lock);
48 acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
52 struct acpi_bus_event event;
53 static char str[ACPI_MAX_STRING];
54 static int chars_remaining = 0;
57 if (!chars_remaining) {
58 memset(&event, 0, sizeof(struct acpi_bus_event));
60 if ((file->f_flags & O_NONBLOCK)
61 && (list_empty(&acpi_bus_event_list)))
64 result = acpi_bus_receive_event(&event);
68 chars_remaining = sprintf(str, "%s %s %08x %08x\n",
69 event.device_class ? event.
70 device_class : "<unknown>",
72 bus_id : "<unknown>", event.type,
77 if (chars_remaining < count) {
78 count = chars_remaining;
81 if (copy_to_user(buffer, ptr, count))
85 chars_remaining -= count;
91 static int acpi_system_close_event(struct inode *inode, struct file *file)
93 spin_lock_irq(&acpi_system_event_lock);
95 spin_unlock_irq(&acpi_system_event_lock);
99 static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
101 poll_wait(file, &acpi_bus_event_queue, wait);
102 if (!list_empty(&acpi_bus_event_list))
103 return POLLIN | POLLRDNORM;
107 static const struct file_operations acpi_system_event_ops = {
108 .owner = THIS_MODULE,
109 .open = acpi_system_open_event,
110 .read = acpi_system_read_event,
111 .release = acpi_system_close_event,
112 .poll = acpi_system_poll_event,
114 #endif /* CONFIG_ACPI_PROC_EVENT */
116 /* ACPI notifier chain */
117 static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
119 int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
121 struct acpi_bus_event event;
123 strcpy(event.device_class, dev->pnp.device_class);
124 strcpy(event.bus_id, dev->pnp.bus_id);
127 return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
128 == NOTIFY_BAD) ? -EINVAL : 0;
130 EXPORT_SYMBOL(acpi_notifier_call_chain);
132 int register_acpi_notifier(struct notifier_block *nb)
134 return blocking_notifier_chain_register(&acpi_chain_head, nb);
136 EXPORT_SYMBOL(register_acpi_notifier);
138 int unregister_acpi_notifier(struct notifier_block *nb)
140 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
142 EXPORT_SYMBOL(unregister_acpi_notifier);
145 static unsigned int acpi_event_seqnum;
146 struct acpi_genl_event {
147 acpi_device_class device_class;
153 /* attributes of acpi_genl_family */
155 ACPI_GENL_ATTR_UNSPEC,
156 ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
157 __ACPI_GENL_ATTR_MAX,
159 #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
161 /* commands supported by the acpi_genl_family */
163 ACPI_GENL_CMD_UNSPEC,
164 ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
167 #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
169 #define ACPI_GENL_FAMILY_NAME "acpi_event"
170 #define ACPI_GENL_VERSION 0x01
171 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
173 static struct genl_family acpi_event_genl_family = {
174 .id = GENL_ID_GENERATE,
175 .name = ACPI_GENL_FAMILY_NAME,
176 .version = ACPI_GENL_VERSION,
177 .maxattr = ACPI_GENL_ATTR_MAX,
180 static struct genl_multicast_group acpi_event_mcgrp = {
181 .name = ACPI_GENL_MCAST_GROUP_NAME,
184 int acpi_bus_generate_netlink_event(const char *device_class,
190 struct acpi_genl_event *event;
195 /* allocate memory */
196 size = nla_total_size(sizeof(struct acpi_genl_event)) +
199 skb = genlmsg_new(size, GFP_ATOMIC);
203 /* add the genetlink message header */
204 msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
205 &acpi_event_genl_family, 0,
206 ACPI_GENL_CMD_EVENT);
214 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
215 sizeof(struct acpi_genl_event));
221 event = nla_data(attr);
227 memset(event, 0, sizeof(struct acpi_genl_event));
229 strcpy(event->device_class, device_class);
230 strcpy(event->bus_id, bus_id);
234 /* send multicast genetlink message */
235 result = genlmsg_end(skb, msg_header);
241 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
245 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
247 static int acpi_event_genetlink_init(void)
251 result = genl_register_family(&acpi_event_genl_family);
255 result = genl_register_mc_group(&acpi_event_genl_family,
258 genl_unregister_family(&acpi_event_genl_family);
264 int acpi_bus_generate_netlink_event(const char *device_class,
271 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
273 static int acpi_event_genetlink_init(void)
279 static int __init acpi_event_init(void)
281 #ifdef CONFIG_ACPI_PROC_EVENT
282 struct proc_dir_entry *entry;
289 /* create genetlink for acpi event */
290 error = acpi_event_genetlink_init();
292 printk(KERN_WARNING PREFIX
293 "Failed to create genetlink family for ACPI event\n");
295 #ifdef CONFIG_ACPI_PROC_EVENT
297 entry = proc_create("event", S_IRUSR, acpi_root_dir,
298 &acpi_system_event_ops);
306 fs_initcall(acpi_event_init);