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 <acpi/acpi_drivers.h>
14 #include <net/netlink.h>
15 #include <net/genetlink.h>
17 #define _COMPONENT ACPI_SYSTEM_COMPONENT
18 ACPI_MODULE_NAME("event");
20 #ifdef CONFIG_ACPI_PROC_EVENT
21 /* Global vars for handling event proc entry */
22 static DEFINE_SPINLOCK(acpi_system_event_lock);
23 int event_is_open = 0;
24 extern struct list_head acpi_bus_event_list;
25 extern wait_queue_head_t acpi_bus_event_queue;
27 static int acpi_system_open_event(struct inode *inode, struct file *file)
29 spin_lock_irq(&acpi_system_event_lock);
36 spin_unlock_irq(&acpi_system_event_lock);
40 spin_unlock_irq(&acpi_system_event_lock);
45 acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
49 struct acpi_bus_event event;
50 static char str[ACPI_MAX_STRING];
51 static int chars_remaining = 0;
54 if (!chars_remaining) {
55 memset(&event, 0, sizeof(struct acpi_bus_event));
57 if ((file->f_flags & O_NONBLOCK)
58 && (list_empty(&acpi_bus_event_list)))
61 result = acpi_bus_receive_event(&event);
65 chars_remaining = sprintf(str, "%s %s %08x %08x\n",
66 event.device_class ? event.
67 device_class : "<unknown>",
69 bus_id : "<unknown>", event.type,
74 if (chars_remaining < count) {
75 count = chars_remaining;
78 if (copy_to_user(buffer, ptr, count))
82 chars_remaining -= count;
88 static int acpi_system_close_event(struct inode *inode, struct file *file)
90 spin_lock_irq(&acpi_system_event_lock);
92 spin_unlock_irq(&acpi_system_event_lock);
96 static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
98 poll_wait(file, &acpi_bus_event_queue, wait);
99 if (!list_empty(&acpi_bus_event_list))
100 return POLLIN | POLLRDNORM;
104 static const struct file_operations acpi_system_event_ops = {
105 .owner = THIS_MODULE,
106 .open = acpi_system_open_event,
107 .read = acpi_system_read_event,
108 .release = acpi_system_close_event,
109 .poll = acpi_system_poll_event,
111 #endif /* CONFIG_ACPI_PROC_EVENT */
113 /* ACPI notifier chain */
114 static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
116 int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
118 struct acpi_bus_event event;
120 strcpy(event.device_class, dev->pnp.device_class);
121 strcpy(event.bus_id, dev->pnp.bus_id);
124 return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
125 == NOTIFY_BAD) ? -EINVAL : 0;
127 EXPORT_SYMBOL(acpi_notifier_call_chain);
129 int register_acpi_notifier(struct notifier_block *nb)
131 return blocking_notifier_chain_register(&acpi_chain_head, nb);
133 EXPORT_SYMBOL(register_acpi_notifier);
135 int unregister_acpi_notifier(struct notifier_block *nb)
137 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
139 EXPORT_SYMBOL(unregister_acpi_notifier);
142 static unsigned int acpi_event_seqnum;
143 struct acpi_genl_event {
144 acpi_device_class device_class;
150 /* attributes of acpi_genl_family */
152 ACPI_GENL_ATTR_UNSPEC,
153 ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
154 __ACPI_GENL_ATTR_MAX,
156 #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
158 /* commands supported by the acpi_genl_family */
160 ACPI_GENL_CMD_UNSPEC,
161 ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
164 #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
166 #define ACPI_GENL_FAMILY_NAME "acpi_event"
167 #define ACPI_GENL_VERSION 0x01
168 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
170 static struct genl_family acpi_event_genl_family = {
171 .id = GENL_ID_GENERATE,
172 .name = ACPI_GENL_FAMILY_NAME,
173 .version = ACPI_GENL_VERSION,
174 .maxattr = ACPI_GENL_ATTR_MAX,
177 static struct genl_multicast_group acpi_event_mcgrp = {
178 .name = ACPI_GENL_MCAST_GROUP_NAME,
181 int acpi_bus_generate_netlink_event(const char *device_class,
187 struct acpi_genl_event *event;
192 /* allocate memory */
193 size = nla_total_size(sizeof(struct acpi_genl_event)) +
196 skb = genlmsg_new(size, GFP_ATOMIC);
200 /* add the genetlink message header */
201 msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
202 &acpi_event_genl_family, 0,
203 ACPI_GENL_CMD_EVENT);
211 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
212 sizeof(struct acpi_genl_event));
218 event = nla_data(attr);
224 memset(event, 0, sizeof(struct acpi_genl_event));
226 strcpy(event->device_class, device_class);
227 strcpy(event->bus_id, bus_id);
231 /* send multicast genetlink message */
232 result = genlmsg_end(skb, msg_header);
239 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
241 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
242 "Failed to send a Genetlink message!\n"));
246 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
248 static int acpi_event_genetlink_init(void)
252 result = genl_register_family(&acpi_event_genl_family);
256 result = genl_register_mc_group(&acpi_event_genl_family,
259 genl_unregister_family(&acpi_event_genl_family);
265 int acpi_bus_generate_netlink_event(const char *device_class,
272 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
274 static int acpi_event_genetlink_init(void)
280 static int __init acpi_event_init(void)
282 #ifdef CONFIG_ACPI_PROC_EVENT
283 struct proc_dir_entry *entry;
290 /* create genetlink for acpi event */
291 error = acpi_event_genetlink_init();
293 printk(KERN_WARNING PREFIX
294 "Failed to create genetlink family for ACPI event\n");
296 #ifdef CONFIG_ACPI_PROC_EVENT
298 entry = proc_create("event", S_IRUSR, acpi_root_dir,
299 &acpi_system_event_ops);
307 fs_initcall(acpi_event_init);