blob: aeb7e5fb4a043b2fbacf8245b3bb4ccabf5a0691 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * event.c - exporting ACPI events via procfs
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 */
8
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>
Zhang Rui864bdfb2007-06-19 11:40:03 +080014#include <net/netlink.h>
15#include <net/genetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#define _COMPONENT ACPI_SYSTEM_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050018ACPI_MODULE_NAME("event");
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Len Brown14e04fb2007-08-23 15:20:26 -040020#ifdef CONFIG_ACPI_PROC_EVENT
Linus Torvalds1da177e2005-04-16 15:20:36 -070021/* Global vars for handling event proc entry */
22static DEFINE_SPINLOCK(acpi_system_event_lock);
Len Brown4be44fc2005-08-05 00:44:28 -040023int event_is_open = 0;
24extern struct list_head acpi_bus_event_list;
25extern wait_queue_head_t acpi_bus_event_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Len Brown4be44fc2005-08-05 00:44:28 -040027static int acpi_system_open_event(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028{
Pavel Machekc65ade42005-08-05 00:37:45 -040029 spin_lock_irq(&acpi_system_event_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Pavel Machekc65ade42005-08-05 00:37:45 -040031 if (event_is_open)
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 goto out_busy;
33
34 event_is_open = 1;
35
Pavel Machekc65ade42005-08-05 00:37:45 -040036 spin_unlock_irq(&acpi_system_event_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 return 0;
38
Len Brown4be44fc2005-08-05 00:44:28 -040039 out_busy:
Pavel Machekc65ade42005-08-05 00:37:45 -040040 spin_unlock_irq(&acpi_system_event_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 return -EBUSY;
42}
43
44static ssize_t
Len Brown4be44fc2005-08-05 00:44:28 -040045acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
46 loff_t * ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
Len Brown4be44fc2005-08-05 00:44:28 -040048 int result = 0;
49 struct acpi_bus_event event;
50 static char str[ACPI_MAX_STRING];
51 static int chars_remaining = 0;
52 static char *ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 if (!chars_remaining) {
55 memset(&event, 0, sizeof(struct acpi_bus_event));
56
57 if ((file->f_flags & O_NONBLOCK)
58 && (list_empty(&acpi_bus_event_list)))
Patrick Mocheld550d982006-06-27 00:41:40 -040059 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 result = acpi_bus_receive_event(&event);
Pavel Machek5cc9eee2005-10-17 16:43:31 -070062 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -040063 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Len Brown4be44fc2005-08-05 00:44:28 -040065 chars_remaining = sprintf(str, "%s %s %08x %08x\n",
66 event.device_class ? event.
67 device_class : "<unknown>",
68 event.bus_id ? event.
69 bus_id : "<unknown>", event.type,
70 event.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 ptr = str;
72 }
73
74 if (chars_remaining < count) {
75 count = chars_remaining;
76 }
77
78 if (copy_to_user(buffer, ptr, count))
Patrick Mocheld550d982006-06-27 00:41:40 -040079 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81 *ppos += count;
82 chars_remaining -= count;
83 ptr += count;
84
Patrick Mocheld550d982006-06-27 00:41:40 -040085 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086}
87
Len Brown4be44fc2005-08-05 00:44:28 -040088static int acpi_system_close_event(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
Len Brown4be44fc2005-08-05 00:44:28 -040090 spin_lock_irq(&acpi_system_event_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 event_is_open = 0;
Len Brown4be44fc2005-08-05 00:44:28 -040092 spin_unlock_irq(&acpi_system_event_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return 0;
94}
95
Len Brown4be44fc2005-08-05 00:44:28 -040096static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
98 poll_wait(file, &acpi_bus_event_queue, wait);
99 if (!list_empty(&acpi_bus_event_list))
100 return POLLIN | POLLRDNORM;
101 return 0;
102}
103
Arjan van de Vend7508032006-07-04 13:06:00 -0400104static const struct file_operations acpi_system_event_ops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700105 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -0400106 .open = acpi_system_open_event,
107 .read = acpi_system_read_event,
108 .release = acpi_system_close_event,
109 .poll = acpi_system_poll_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110};
Len Brown14e04fb2007-08-23 15:20:26 -0400111#endif /* CONFIG_ACPI_PROC_EVENT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Zhang Rui9ee85242008-01-25 14:48:06 +0800113/* ACPI notifier chain */
Adrian Bunkc8e773f2008-02-13 23:29:57 +0200114static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
Zhang Rui9ee85242008-01-25 14:48:06 +0800115
116int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
117{
118 struct acpi_bus_event event;
119
120 strcpy(event.device_class, dev->pnp.device_class);
121 strcpy(event.bus_id, dev->pnp.bus_id);
122 event.type = type;
123 event.data = data;
124 return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
125 == NOTIFY_BAD) ? -EINVAL : 0;
126}
127EXPORT_SYMBOL(acpi_notifier_call_chain);
128
129int register_acpi_notifier(struct notifier_block *nb)
130{
131 return blocking_notifier_chain_register(&acpi_chain_head, nb);
132}
133EXPORT_SYMBOL(register_acpi_notifier);
134
135int unregister_acpi_notifier(struct notifier_block *nb)
136{
137 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
138}
139EXPORT_SYMBOL(unregister_acpi_notifier);
140
Zhang Rui864bdfb2007-06-19 11:40:03 +0800141#ifdef CONFIG_NET
Adrian Bunke13d8742007-08-10 13:45:18 -0700142static unsigned int acpi_event_seqnum;
Zhang Rui864bdfb2007-06-19 11:40:03 +0800143struct acpi_genl_event {
144 acpi_device_class device_class;
145 char bus_id[15];
146 u32 type;
147 u32 data;
148};
149
150/* attributes of acpi_genl_family */
151enum {
152 ACPI_GENL_ATTR_UNSPEC,
153 ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
154 __ACPI_GENL_ATTR_MAX,
155};
156#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
157
158/* commands supported by the acpi_genl_family */
159enum {
160 ACPI_GENL_CMD_UNSPEC,
161 ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
162 __ACPI_GENL_CMD_MAX,
163};
164#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
165
Zhang Rui9c977a42007-07-20 16:41:14 +0800166#define ACPI_GENL_FAMILY_NAME "acpi_event"
167#define ACPI_GENL_VERSION 0x01
168#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
Zhang Rui864bdfb2007-06-19 11:40:03 +0800169
170static struct genl_family acpi_event_genl_family = {
171 .id = GENL_ID_GENERATE,
Zhang Rui9c977a42007-07-20 16:41:14 +0800172 .name = ACPI_GENL_FAMILY_NAME,
Zhang Rui864bdfb2007-06-19 11:40:03 +0800173 .version = ACPI_GENL_VERSION,
174 .maxattr = ACPI_GENL_ATTR_MAX,
175};
176
Zhang Rui9c977a42007-07-20 16:41:14 +0800177static struct genl_multicast_group acpi_event_mcgrp = {
178 .name = ACPI_GENL_MCAST_GROUP_NAME,
Zhang Rui864bdfb2007-06-19 11:40:03 +0800179};
180
Zhang Rui962ce8c2007-08-23 01:24:31 +0800181int acpi_bus_generate_netlink_event(const char *device_class,
182 const char *bus_id,
Zhang Rui864bdfb2007-06-19 11:40:03 +0800183 u8 type, int data)
184{
185 struct sk_buff *skb;
186 struct nlattr *attr;
187 struct acpi_genl_event *event;
188 void *msg_header;
189 int size;
190 int result;
191
192 /* allocate memory */
193 size = nla_total_size(sizeof(struct acpi_genl_event)) +
194 nla_total_size(0);
195
196 skb = genlmsg_new(size, GFP_ATOMIC);
197 if (!skb)
198 return -ENOMEM;
199
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);
204 if (!msg_header) {
205 nlmsg_free(skb);
206 return -ENOMEM;
207 }
208
209 /* fill the data */
210 attr =
211 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
212 sizeof(struct acpi_genl_event));
213 if (!attr) {
214 nlmsg_free(skb);
215 return -EINVAL;
216 }
217
218 event = nla_data(attr);
219 if (!event) {
220 nlmsg_free(skb);
221 return -EINVAL;
222 }
223
224 memset(event, 0, sizeof(struct acpi_genl_event));
225
Zhang Rui962ce8c2007-08-23 01:24:31 +0800226 strcpy(event->device_class, device_class);
227 strcpy(event->bus_id, bus_id);
Zhang Rui864bdfb2007-06-19 11:40:03 +0800228 event->type = type;
229 event->data = data;
230
231 /* send multicast genetlink message */
232 result = genlmsg_end(skb, msg_header);
233 if (result < 0) {
234 nlmsg_free(skb);
235 return result;
236 }
237
Pablo Neira Ayusoff491a72009-02-05 23:56:36 -0800238 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
Zhang Rui864bdfb2007-06-19 11:40:03 +0800239 return 0;
240}
Zhang Rui864bdfb2007-06-19 11:40:03 +0800241
Zhang Rui962ce8c2007-08-23 01:24:31 +0800242EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
243
Zhang Rui864bdfb2007-06-19 11:40:03 +0800244static int acpi_event_genetlink_init(void)
245{
246 int result;
247
248 result = genl_register_family(&acpi_event_genl_family);
249 if (result)
250 return result;
251
Zhang Rui9c977a42007-07-20 16:41:14 +0800252 result = genl_register_mc_group(&acpi_event_genl_family,
253 &acpi_event_mcgrp);
Zhang Rui864bdfb2007-06-19 11:40:03 +0800254 if (result)
255 genl_unregister_family(&acpi_event_genl_family);
256
257 return result;
258}
259
260#else
Len Brown3e069ee2007-08-24 03:06:33 -0400261int acpi_bus_generate_netlink_event(const char *device_class,
262 const char *bus_id,
263 u8 type, int data)
Zhang Rui864bdfb2007-06-19 11:40:03 +0800264{
265 return 0;
266}
Zhang Rui864bdfb2007-06-19 11:40:03 +0800267
Henrique de Moraes Holschuh66baf322007-09-03 00:03:35 -0300268EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800269
Zhang Rui864bdfb2007-06-19 11:40:03 +0800270static int acpi_event_genetlink_init(void)
271{
272 return -ENODEV;
273}
274#endif
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276static int __init acpi_event_init(void)
277{
Len Brown14e04fb2007-08-23 15:20:26 -0400278#ifdef CONFIG_ACPI_PROC_EVENT
Len Brown4be44fc2005-08-05 00:44:28 -0400279 struct proc_dir_entry *entry;
Len Brown14e04fb2007-08-23 15:20:26 -0400280#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 int error = 0;
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400284 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Zhang Rui864bdfb2007-06-19 11:40:03 +0800286 /* create genetlink for acpi event */
287 error = acpi_event_genetlink_init();
288 if (error)
289 printk(KERN_WARNING PREFIX
290 "Failed to create genetlink family for ACPI event\n");
291
Len Brown14e04fb2007-08-23 15:20:26 -0400292#ifdef CONFIG_ACPI_PROC_EVENT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 /* 'event' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700294 entry = proc_create("event", S_IRUSR, acpi_root_dir,
295 &acpi_system_event_ops);
296 if (!entry)
Zhang Rui864bdfb2007-06-19 11:40:03 +0800297 return -ENODEV;
Len Brown14e04fb2007-08-23 15:20:26 -0400298#endif
Zhang Rui864bdfb2007-06-19 11:40:03 +0800299
300 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
Zhang Rui864bdfb2007-06-19 11:40:03 +0800303fs_initcall(acpi_event_init);