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
);