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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>
16
17#include "internal.h"
18
19#define _COMPONENT ACPI_SYSTEM_COMPONENT
20ACPI_MODULE_NAME("event");
21
22#ifdef CONFIG_ACPI_PROC_EVENT
23
24static DEFINE_SPINLOCK(acpi_system_event_lock);
25int event_is_open = 0;
26extern struct list_head acpi_bus_event_list;
27extern wait_queue_head_t acpi_bus_event_queue;
28
29static int acpi_system_open_event(struct inode *inode, struct file *file)
30{
31 spin_lock_irq(&acpi_system_event_lock);
32
33 if (event_is_open)
34 goto out_busy;
35
36 event_is_open = 1;
37
38 spin_unlock_irq(&acpi_system_event_lock);
39 return 0;
40
41 out_busy:
42 spin_unlock_irq(&acpi_system_event_lock);
43 return -EBUSY;
44}
45
46static ssize_t
47acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
48 loff_t * ppos)
49{
50 int result = 0;
51 struct acpi_bus_event event;
52 static char str[ACPI_MAX_STRING];
53 static int chars_remaining = 0;
54 static char *ptr;
55
56 if (!chars_remaining) {
57 memset(&event, 0, sizeof(struct acpi_bus_event));
58
59 if ((file->f_flags & O_NONBLOCK)
60 && (list_empty(&acpi_bus_event_list)))
61 return -EAGAIN;
62
63 result = acpi_bus_receive_event(&event);
64 if (result)
65 return result;
66
67 chars_remaining = sprintf(str, "%s %s %08x %08x\n",
68 event.device_class ? event.
69 device_class : "<unknown>",
70 event.bus_id ? event.
71 bus_id : "<unknown>", event.type,
72 event.data);
73 ptr = str;
74 }
75
76 if (chars_remaining < count) {
77 count = chars_remaining;
78 }
79
80 if (copy_to_user(buffer, ptr, count))
81 return -EFAULT;
82
83 *ppos += count;
84 chars_remaining -= count;
85 ptr += count;
86
87 return count;
88}
89
90static int acpi_system_close_event(struct inode *inode, struct file *file)
91{
92 spin_lock_irq(&acpi_system_event_lock);
93 event_is_open = 0;
94 spin_unlock_irq(&acpi_system_event_lock);
95 return 0;
96}
97
98static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
99{
100 poll_wait(file, &acpi_bus_event_queue, wait);
101 if (!list_empty(&acpi_bus_event_list))
102 return POLLIN | POLLRDNORM;
103 return 0;
104}
105
106static const struct file_operations acpi_system_event_ops = {
107 .owner = THIS_MODULE,
108 .open = acpi_system_open_event,
109 .read = acpi_system_read_event,
110 .release = acpi_system_close_event,
111 .poll = acpi_system_poll_event,
112};
113#endif
114
115
116static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
117
118int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
119{
120 struct acpi_bus_event event;
121
122 strcpy(event.device_class, dev->pnp.device_class);
123 strcpy(event.bus_id, dev->pnp.bus_id);
124 event.type = type;
125 event.data = data;
126 return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
127 == NOTIFY_BAD) ? -EINVAL : 0;
128}
129EXPORT_SYMBOL(acpi_notifier_call_chain);
130
131int register_acpi_notifier(struct notifier_block *nb)
132{
133 return blocking_notifier_chain_register(&acpi_chain_head, nb);
134}
135EXPORT_SYMBOL(register_acpi_notifier);
136
137int unregister_acpi_notifier(struct notifier_block *nb)
138{
139 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
140}
141EXPORT_SYMBOL(unregister_acpi_notifier);
142
143#ifdef CONFIG_NET
144static unsigned int acpi_event_seqnum;
145struct acpi_genl_event {
146 acpi_device_class device_class;
147 char bus_id[15];
148 u32 type;
149 u32 data;
150};
151
152
153enum {
154 ACPI_GENL_ATTR_UNSPEC,
155 ACPI_GENL_ATTR_EVENT,
156 __ACPI_GENL_ATTR_MAX,
157};
158#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
159
160
161enum {
162 ACPI_GENL_CMD_UNSPEC,
163 ACPI_GENL_CMD_EVENT,
164 __ACPI_GENL_CMD_MAX,
165};
166#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
167
168#define ACPI_GENL_FAMILY_NAME "acpi_event"
169#define ACPI_GENL_VERSION 0x01
170#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
171
172static struct genl_family acpi_event_genl_family = {
173 .id = GENL_ID_GENERATE,
174 .name = ACPI_GENL_FAMILY_NAME,
175 .version = ACPI_GENL_VERSION,
176 .maxattr = ACPI_GENL_ATTR_MAX,
177};
178
179static struct genl_multicast_group acpi_event_mcgrp = {
180 .name = ACPI_GENL_MCAST_GROUP_NAME,
181};
182
183int acpi_bus_generate_netlink_event(const char *device_class,
184 const char *bus_id,
185 u8 type, int data)
186{
187 struct sk_buff *skb;
188 struct nlattr *attr;
189 struct acpi_genl_event *event;
190 void *msg_header;
191 int size;
192 int result;
193
194
195 size = nla_total_size(sizeof(struct acpi_genl_event)) +
196 nla_total_size(0);
197
198 skb = genlmsg_new(size, GFP_ATOMIC);
199 if (!skb)
200 return -ENOMEM;
201
202
203 msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
204 &acpi_event_genl_family, 0,
205 ACPI_GENL_CMD_EVENT);
206 if (!msg_header) {
207 nlmsg_free(skb);
208 return -ENOMEM;
209 }
210
211
212 attr =
213 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
214 sizeof(struct acpi_genl_event));
215 if (!attr) {
216 nlmsg_free(skb);
217 return -EINVAL;
218 }
219
220 event = nla_data(attr);
221 if (!event) {
222 nlmsg_free(skb);
223 return -EINVAL;
224 }
225
226 memset(event, 0, sizeof(struct acpi_genl_event));
227
228 strcpy(event->device_class, device_class);
229 strcpy(event->bus_id, bus_id);
230 event->type = type;
231 event->data = data;
232
233
234 result = genlmsg_end(skb, msg_header);
235 if (result < 0) {
236 nlmsg_free(skb);
237 return result;
238 }
239
240 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
241 return 0;
242}
243
244EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
245
246static int acpi_event_genetlink_init(void)
247{
248 int result;
249
250 result = genl_register_family(&acpi_event_genl_family);
251 if (result)
252 return result;
253
254 result = genl_register_mc_group(&acpi_event_genl_family,
255 &acpi_event_mcgrp);
256 if (result)
257 genl_unregister_family(&acpi_event_genl_family);
258
259 return result;
260}
261
262#else
263int acpi_bus_generate_netlink_event(const char *device_class,
264 const char *bus_id,
265 u8 type, int data)
266{
267 return 0;
268}
269
270EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
271
272static int acpi_event_genetlink_init(void)
273{
274 return -ENODEV;
275}
276#endif
277
278static int __init acpi_event_init(void)
279{
280#ifdef CONFIG_ACPI_PROC_EVENT
281 struct proc_dir_entry *entry;
282#endif
283 int error = 0;
284
285 if (acpi_disabled)
286 return 0;
287
288
289 error = acpi_event_genetlink_init();
290 if (error)
291 printk(KERN_WARNING PREFIX
292 "Failed to create genetlink family for ACPI event\n");
293
294#ifdef CONFIG_ACPI_PROC_EVENT
295
296 entry = proc_create("event", S_IRUSR, acpi_root_dir,
297 &acpi_system_event_ops);
298 if (!entry)
299 return -ENODEV;
300#endif
301
302 return 0;
303}
304
305fs_initcall(acpi_event_init);
306
