Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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> | |
864bdfb9 ZR |
14 | #include <net/netlink.h> |
15 | #include <net/genetlink.h> | |
1da177e4 LT |
16 | |
17 | #define _COMPONENT ACPI_SYSTEM_COMPONENT | |
f52fd66d | 18 | ACPI_MODULE_NAME("event"); |
1da177e4 | 19 | |
14e04fb3 | 20 | #ifdef CONFIG_ACPI_PROC_EVENT |
1da177e4 LT |
21 | /* Global vars for handling event proc entry */ |
22 | static DEFINE_SPINLOCK(acpi_system_event_lock); | |
4be44fcd LB |
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; | |
1da177e4 | 26 | |
4be44fcd | 27 | static int acpi_system_open_event(struct inode *inode, struct file *file) |
1da177e4 | 28 | { |
c65ade4d | 29 | spin_lock_irq(&acpi_system_event_lock); |
1da177e4 | 30 | |
c65ade4d | 31 | if (event_is_open) |
1da177e4 LT |
32 | goto out_busy; |
33 | ||
34 | event_is_open = 1; | |
35 | ||
c65ade4d | 36 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
37 | return 0; |
38 | ||
4be44fcd | 39 | out_busy: |
c65ade4d | 40 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
41 | return -EBUSY; |
42 | } | |
43 | ||
44 | static ssize_t | |
4be44fcd LB |
45 | acpi_system_read_event(struct file *file, char __user * buffer, size_t count, |
46 | loff_t * ppos) | |
1da177e4 | 47 | { |
4be44fcd LB |
48 | 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; | |
1da177e4 | 53 | |
1da177e4 LT |
54 | 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))) | |
d550d98d | 59 | return -EAGAIN; |
1da177e4 LT |
60 | |
61 | result = acpi_bus_receive_event(&event); | |
5cc9eeef | 62 | if (result) |
d550d98d | 63 | return result; |
1da177e4 | 64 | |
4be44fcd LB |
65 | 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); | |
1da177e4 LT |
71 | ptr = str; |
72 | } | |
73 | ||
74 | if (chars_remaining < count) { | |
75 | count = chars_remaining; | |
76 | } | |
77 | ||
78 | if (copy_to_user(buffer, ptr, count)) | |
d550d98d | 79 | return -EFAULT; |
1da177e4 LT |
80 | |
81 | *ppos += count; | |
82 | chars_remaining -= count; | |
83 | ptr += count; | |
84 | ||
d550d98d | 85 | return count; |
1da177e4 LT |
86 | } |
87 | ||
4be44fcd | 88 | static int acpi_system_close_event(struct inode *inode, struct file *file) |
1da177e4 | 89 | { |
4be44fcd | 90 | spin_lock_irq(&acpi_system_event_lock); |
1da177e4 | 91 | event_is_open = 0; |
4be44fcd | 92 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
93 | return 0; |
94 | } | |
95 | ||
4be44fcd | 96 | static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait) |
1da177e4 LT |
97 | { |
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 | ||
d7508032 | 104 | static const struct file_operations acpi_system_event_ops = { |
cf7acfab | 105 | .owner = THIS_MODULE, |
4be44fcd LB |
106 | .open = acpi_system_open_event, |
107 | .read = acpi_system_read_event, | |
108 | .release = acpi_system_close_event, | |
109 | .poll = acpi_system_poll_event, | |
1da177e4 | 110 | }; |
14e04fb3 | 111 | #endif /* CONFIG_ACPI_PROC_EVENT */ |
1da177e4 | 112 | |
9ee85241 | 113 | /* ACPI notifier chain */ |
c8e773fa | 114 | static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); |
9ee85241 ZR |
115 | |
116 | int 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 | } | |
127 | EXPORT_SYMBOL(acpi_notifier_call_chain); | |
128 | ||
129 | int register_acpi_notifier(struct notifier_block *nb) | |
130 | { | |
131 | return blocking_notifier_chain_register(&acpi_chain_head, nb); | |
132 | } | |
133 | EXPORT_SYMBOL(register_acpi_notifier); | |
134 | ||
135 | int unregister_acpi_notifier(struct notifier_block *nb) | |
136 | { | |
137 | return blocking_notifier_chain_unregister(&acpi_chain_head, nb); | |
138 | } | |
139 | EXPORT_SYMBOL(unregister_acpi_notifier); | |
140 | ||
864bdfb9 | 141 | #ifdef CONFIG_NET |
e13d8747 | 142 | static unsigned int acpi_event_seqnum; |
864bdfb9 ZR |
143 | struct 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 */ | |
151 | enum { | |
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 */ | |
159 | enum { | |
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 | ||
9c977a45 ZR |
166 | #define ACPI_GENL_FAMILY_NAME "acpi_event" |
167 | #define ACPI_GENL_VERSION 0x01 | |
168 | #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" | |
864bdfb9 ZR |
169 | |
170 | static struct genl_family acpi_event_genl_family = { | |
171 | .id = GENL_ID_GENERATE, | |
9c977a45 | 172 | .name = ACPI_GENL_FAMILY_NAME, |
864bdfb9 ZR |
173 | .version = ACPI_GENL_VERSION, |
174 | .maxattr = ACPI_GENL_ATTR_MAX, | |
175 | }; | |
176 | ||
9c977a45 ZR |
177 | static struct genl_multicast_group acpi_event_mcgrp = { |
178 | .name = ACPI_GENL_MCAST_GROUP_NAME, | |
864bdfb9 ZR |
179 | }; |
180 | ||
962ce8ca ZR |
181 | int acpi_bus_generate_netlink_event(const char *device_class, |
182 | const char *bus_id, | |
864bdfb9 ZR |
183 | 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 | ||
962ce8ca ZR |
226 | strcpy(event->device_class, device_class); |
227 | strcpy(event->bus_id, bus_id); | |
864bdfb9 ZR |
228 | 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 | ||
238 | result = | |
9c977a45 | 239 | genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC); |
864bdfb9 ZR |
240 | if (result) |
241 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
242 | "Failed to send a Genetlink message!\n")); | |
243 | return 0; | |
244 | } | |
864bdfb9 | 245 | |
962ce8ca ZR |
246 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
247 | ||
864bdfb9 ZR |
248 | static int acpi_event_genetlink_init(void) |
249 | { | |
250 | int result; | |
251 | ||
252 | result = genl_register_family(&acpi_event_genl_family); | |
253 | if (result) | |
254 | return result; | |
255 | ||
9c977a45 ZR |
256 | result = genl_register_mc_group(&acpi_event_genl_family, |
257 | &acpi_event_mcgrp); | |
864bdfb9 ZR |
258 | if (result) |
259 | genl_unregister_family(&acpi_event_genl_family); | |
260 | ||
261 | return result; | |
262 | } | |
263 | ||
264 | #else | |
3e069ee0 LB |
265 | int acpi_bus_generate_netlink_event(const char *device_class, |
266 | const char *bus_id, | |
267 | u8 type, int data) | |
864bdfb9 ZR |
268 | { |
269 | return 0; | |
270 | } | |
864bdfb9 | 271 | |
66baf327 | 272 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
962ce8ca | 273 | |
864bdfb9 ZR |
274 | static int acpi_event_genetlink_init(void) |
275 | { | |
276 | return -ENODEV; | |
277 | } | |
278 | #endif | |
279 | ||
1da177e4 LT |
280 | static int __init acpi_event_init(void) |
281 | { | |
14e04fb3 | 282 | #ifdef CONFIG_ACPI_PROC_EVENT |
4be44fcd | 283 | struct proc_dir_entry *entry; |
14e04fb3 | 284 | #endif |
1da177e4 LT |
285 | int error = 0; |
286 | ||
1da177e4 | 287 | if (acpi_disabled) |
d550d98d | 288 | return 0; |
1da177e4 | 289 | |
864bdfb9 ZR |
290 | /* create genetlink for acpi event */ |
291 | error = acpi_event_genetlink_init(); | |
292 | if (error) | |
293 | printk(KERN_WARNING PREFIX | |
294 | "Failed to create genetlink family for ACPI event\n"); | |
295 | ||
14e04fb3 | 296 | #ifdef CONFIG_ACPI_PROC_EVENT |
1da177e4 | 297 | /* 'event' [R] */ |
cf7acfab DL |
298 | entry = proc_create("event", S_IRUSR, acpi_root_dir, |
299 | &acpi_system_event_ops); | |
300 | if (!entry) | |
864bdfb9 | 301 | return -ENODEV; |
14e04fb3 | 302 | #endif |
864bdfb9 ZR |
303 | |
304 | return 0; | |
1da177e4 LT |
305 | } |
306 | ||
864bdfb9 | 307 | fs_initcall(acpi_event_init); |