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 <acpi/acpi_drivers.h>
16 #include <net/netlink.h>
17 #include <net/genetlink.h>
21 #define _COMPONENT ACPI_SYSTEM_COMPONENT
22 ACPI_MODULE_NAME("event");
24 #ifdef CONFIG_ACPI_PROC_EVENT
25 /* Global vars for handling event proc entry */
26 static DEFINE_SPINLOCK(acpi_system_event_lock);
27 int event_is_open = 0;
28 extern struct list_head acpi_bus_event_list;
29 extern wait_queue_head_t acpi_bus_event_queue;
31 static int acpi_system_open_event(struct inode *inode, struct file *file)
33 spin_lock_irq(&acpi_system_event_lock);
40 spin_unlock_irq(&acpi_system_event_lock);
44 spin_unlock_irq(&acpi_system_event_lock);
49 acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
53 struct acpi_bus_event event;
54 static char str[ACPI_MAX_STRING];
55 static int chars_remaining = 0;
58 if (!chars_remaining) {
59 memset(&event, 0, sizeof(struct acpi_bus_event));
61 if ((file->f_flags & O_NONBLOCK)
62 && (list_empty(&acpi_bus_event_list)))
65 result = acpi_bus_receive_event(&event);
69 chars_remaining = sprintf(str, "%s %s %08x %08x\n",
70 event.device_class ? event.
71 device_class : "<unknown>",
73 bus_id : "<unknown>", event.type,
78 if (chars_remaining < count) {
79 count = chars_remaining;
82 if (copy_to_user(buffer, ptr, count))
86 chars_remaining -= count;
92 static int acpi_system_close_event(struct inode *inode, struct file *file)
94 spin_lock_irq(&acpi_system_event_lock);
96 spin_unlock_irq(&acpi_system_event_lock);
100 static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
102 poll_wait(file, &acpi_bus_event_queue, wait);
103 if (!list_empty(&acpi_bus_event_list))
104 return POLLIN | POLLRDNORM;
108 static const struct file_operations acpi_system_event_ops = {
109 .owner = THIS_MODULE,
110 .open = acpi_system_open_event,
111 .read = acpi_system_read_event,
112 .release = acpi_system_close_event,
113 .poll = acpi_system_poll_event,
114 .llseek = default_llseek,
116 #endif /* CONFIG_ACPI_PROC_EVENT */
118 /* ACPI notifier chain */
119 static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
121 int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
123 struct acpi_bus_event event;
125 strcpy(event.device_class, dev->pnp.device_class);
126 strcpy(event.bus_id, dev->pnp.bus_id);
129 return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
130 == NOTIFY_BAD) ? -EINVAL : 0;
132 EXPORT_SYMBOL(acpi_notifier_call_chain);
134 int register_acpi_notifier(struct notifier_block *nb)
136 return blocking_notifier_chain_register(&acpi_chain_head, nb);
138 EXPORT_SYMBOL(register_acpi_notifier);
140 int unregister_acpi_notifier(struct notifier_block *nb)
142 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
144 EXPORT_SYMBOL(unregister_acpi_notifier);
147 static unsigned int acpi_event_seqnum;
148 struct acpi_genl_event {
149 acpi_device_class device_class;
155 /* attributes of acpi_genl_family */
157 ACPI_GENL_ATTR_UNSPEC,
158 ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
159 __ACPI_GENL_ATTR_MAX,
161 #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
163 /* commands supported by the acpi_genl_family */
165 ACPI_GENL_CMD_UNSPEC,
166 ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
169 #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
171 #define ACPI_GENL_FAMILY_NAME "acpi_event"
172 #define ACPI_GENL_VERSION 0x01
173 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
175 static struct genl_family acpi_event_genl_family = {
176 .id = GENL_ID_GENERATE,
177 .name = ACPI_GENL_FAMILY_NAME,
178 .version = ACPI_GENL_VERSION,
179 .maxattr = ACPI_GENL_ATTR_MAX,
182 static struct genl_multicast_group acpi_event_mcgrp = {
183 .name = ACPI_GENL_MCAST_GROUP_NAME,
186 int acpi_bus_generate_netlink_event(const char *device_class,
192 struct acpi_genl_event *event;
197 /* allocate memory */
198 size = nla_total_size(sizeof(struct acpi_genl_event)) +
201 skb = genlmsg_new(size, GFP_ATOMIC);
205 /* add the genetlink message header */
206 msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
207 &acpi_event_genl_family, 0,
208 ACPI_GENL_CMD_EVENT);
216 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
217 sizeof(struct acpi_genl_event));
223 event = nla_data(attr);
229 memset(event, 0, sizeof(struct acpi_genl_event));
231 strcpy(event->device_class, device_class);
232 strcpy(event->bus_id, bus_id);
236 /* send multicast genetlink message */
237 result = genlmsg_end(skb, msg_header);
243 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
247 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
249 static int acpi_event_genetlink_init(void)
253 result = genl_register_family(&acpi_event_genl_family);
257 result = genl_register_mc_group(&acpi_event_genl_family,
260 genl_unregister_family(&acpi_event_genl_family);
266 int acpi_bus_generate_netlink_event(const char *device_class,
273 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
275 static int acpi_event_genetlink_init(void)
281 static int __init acpi_event_init(void)
283 #ifdef CONFIG_ACPI_PROC_EVENT
284 struct proc_dir_entry *entry;
291 /* create genetlink for acpi event */
292 error = acpi_event_genetlink_init();
294 printk(KERN_WARNING PREFIX
295 "Failed to create genetlink family for ACPI event\n");
297 #ifdef CONFIG_ACPI_PROC_EVENT
299 entry = proc_create("event", S_IRUSR, acpi_root_dir,
300 &acpi_system_event_ops);
308 fs_initcall(acpi_event_init);