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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 | 16 | |
a192a958 LB |
17 | #include "internal.h" |
18 | ||
1da177e4 | 19 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
f52fd66d | 20 | ACPI_MODULE_NAME("event"); |
1da177e4 | 21 | |
14e04fb3 | 22 | #ifdef CONFIG_ACPI_PROC_EVENT |
1da177e4 LT |
23 | /* Global vars for handling event proc entry */ |
24 | static DEFINE_SPINLOCK(acpi_system_event_lock); | |
4be44fcd LB |
25 | int event_is_open = 0; |
26 | extern struct list_head acpi_bus_event_list; | |
27 | extern wait_queue_head_t acpi_bus_event_queue; | |
1da177e4 | 28 | |
4be44fcd | 29 | static int acpi_system_open_event(struct inode *inode, struct file *file) |
1da177e4 | 30 | { |
c65ade4d | 31 | spin_lock_irq(&acpi_system_event_lock); |
1da177e4 | 32 | |
c65ade4d | 33 | if (event_is_open) |
1da177e4 LT |
34 | goto out_busy; |
35 | ||
36 | event_is_open = 1; | |
37 | ||
c65ade4d | 38 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
39 | return 0; |
40 | ||
4be44fcd | 41 | out_busy: |
c65ade4d | 42 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
43 | return -EBUSY; |
44 | } | |
45 | ||
46 | static ssize_t | |
4be44fcd LB |
47 | acpi_system_read_event(struct file *file, char __user * buffer, size_t count, |
48 | loff_t * ppos) | |
1da177e4 | 49 | { |
4be44fcd LB |
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; | |
1da177e4 | 55 | |
1da177e4 LT |
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))) | |
d550d98d | 61 | return -EAGAIN; |
1da177e4 LT |
62 | |
63 | result = acpi_bus_receive_event(&event); | |
5cc9eeef | 64 | if (result) |
d550d98d | 65 | return result; |
1da177e4 | 66 | |
4be44fcd LB |
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); | |
1da177e4 LT |
73 | ptr = str; |
74 | } | |
75 | ||
76 | if (chars_remaining < count) { | |
77 | count = chars_remaining; | |
78 | } | |
79 | ||
80 | if (copy_to_user(buffer, ptr, count)) | |
d550d98d | 81 | return -EFAULT; |
1da177e4 LT |
82 | |
83 | *ppos += count; | |
84 | chars_remaining -= count; | |
85 | ptr += count; | |
86 | ||
d550d98d | 87 | return count; |
1da177e4 LT |
88 | } |
89 | ||
4be44fcd | 90 | static int acpi_system_close_event(struct inode *inode, struct file *file) |
1da177e4 | 91 | { |
4be44fcd | 92 | spin_lock_irq(&acpi_system_event_lock); |
1da177e4 | 93 | event_is_open = 0; |
4be44fcd | 94 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
95 | return 0; |
96 | } | |
97 | ||
4be44fcd | 98 | static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait) |
1da177e4 LT |
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 | ||
d7508032 | 106 | static const struct file_operations acpi_system_event_ops = { |
cf7acfab | 107 | .owner = THIS_MODULE, |
4be44fcd LB |
108 | .open = acpi_system_open_event, |
109 | .read = acpi_system_read_event, | |
110 | .release = acpi_system_close_event, | |
111 | .poll = acpi_system_poll_event, | |
1da177e4 | 112 | }; |
14e04fb3 | 113 | #endif /* CONFIG_ACPI_PROC_EVENT */ |
1da177e4 | 114 | |
9ee85241 | 115 | /* ACPI notifier chain */ |
c8e773fa | 116 | static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); |
9ee85241 ZR |
117 | |
118 | int 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 | } | |
129 | EXPORT_SYMBOL(acpi_notifier_call_chain); | |
130 | ||
131 | int register_acpi_notifier(struct notifier_block *nb) | |
132 | { | |
133 | return blocking_notifier_chain_register(&acpi_chain_head, nb); | |
134 | } | |
135 | EXPORT_SYMBOL(register_acpi_notifier); | |
136 | ||
137 | int unregister_acpi_notifier(struct notifier_block *nb) | |
138 | { | |
139 | return blocking_notifier_chain_unregister(&acpi_chain_head, nb); | |
140 | } | |
141 | EXPORT_SYMBOL(unregister_acpi_notifier); | |
142 | ||
864bdfb9 | 143 | #ifdef CONFIG_NET |
e13d8747 | 144 | static unsigned int acpi_event_seqnum; |
864bdfb9 ZR |
145 | struct acpi_genl_event { |
146 | acpi_device_class device_class; | |
147 | char bus_id[15]; | |
148 | u32 type; | |
149 | u32 data; | |
150 | }; | |
151 | ||
152 | /* attributes of acpi_genl_family */ | |
153 | enum { | |
154 | ACPI_GENL_ATTR_UNSPEC, | |
155 | ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ | |
156 | __ACPI_GENL_ATTR_MAX, | |
157 | }; | |
158 | #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) | |
159 | ||
160 | /* commands supported by the acpi_genl_family */ | |
161 | enum { | |
162 | ACPI_GENL_CMD_UNSPEC, | |
163 | ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ | |
164 | __ACPI_GENL_CMD_MAX, | |
165 | }; | |
166 | #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) | |
167 | ||
9c977a45 ZR |
168 | #define ACPI_GENL_FAMILY_NAME "acpi_event" |
169 | #define ACPI_GENL_VERSION 0x01 | |
170 | #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" | |
864bdfb9 ZR |
171 | |
172 | static struct genl_family acpi_event_genl_family = { | |
173 | .id = GENL_ID_GENERATE, | |
9c977a45 | 174 | .name = ACPI_GENL_FAMILY_NAME, |
864bdfb9 ZR |
175 | .version = ACPI_GENL_VERSION, |
176 | .maxattr = ACPI_GENL_ATTR_MAX, | |
177 | }; | |
178 | ||
9c977a45 ZR |
179 | static struct genl_multicast_group acpi_event_mcgrp = { |
180 | .name = ACPI_GENL_MCAST_GROUP_NAME, | |
864bdfb9 ZR |
181 | }; |
182 | ||
962ce8ca ZR |
183 | int acpi_bus_generate_netlink_event(const char *device_class, |
184 | const char *bus_id, | |
864bdfb9 ZR |
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 | /* allocate memory */ | |
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 | /* add the genetlink message header */ | |
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 | /* fill the data */ | |
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 | ||
962ce8ca ZR |
228 | strcpy(event->device_class, device_class); |
229 | strcpy(event->bus_id, bus_id); | |
864bdfb9 ZR |
230 | event->type = type; |
231 | event->data = data; | |
232 | ||
233 | /* send multicast genetlink message */ | |
234 | result = genlmsg_end(skb, msg_header); | |
235 | if (result < 0) { | |
236 | nlmsg_free(skb); | |
237 | return result; | |
238 | } | |
239 | ||
ff491a73 | 240 | genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC); |
864bdfb9 ZR |
241 | return 0; |
242 | } | |
864bdfb9 | 243 | |
962ce8ca ZR |
244 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
245 | ||
864bdfb9 ZR |
246 | static 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 | ||
9c977a45 ZR |
254 | result = genl_register_mc_group(&acpi_event_genl_family, |
255 | &acpi_event_mcgrp); | |
864bdfb9 ZR |
256 | if (result) |
257 | genl_unregister_family(&acpi_event_genl_family); | |
258 | ||
259 | return result; | |
260 | } | |
261 | ||
262 | #else | |
3e069ee0 LB |
263 | int acpi_bus_generate_netlink_event(const char *device_class, |
264 | const char *bus_id, | |
265 | u8 type, int data) | |
864bdfb9 ZR |
266 | { |
267 | return 0; | |
268 | } | |
864bdfb9 | 269 | |
66baf327 | 270 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
962ce8ca | 271 | |
864bdfb9 ZR |
272 | static int acpi_event_genetlink_init(void) |
273 | { | |
274 | return -ENODEV; | |
275 | } | |
276 | #endif | |
277 | ||
1da177e4 LT |
278 | static int __init acpi_event_init(void) |
279 | { | |
14e04fb3 | 280 | #ifdef CONFIG_ACPI_PROC_EVENT |
4be44fcd | 281 | struct proc_dir_entry *entry; |
14e04fb3 | 282 | #endif |
1da177e4 LT |
283 | int error = 0; |
284 | ||
1da177e4 | 285 | if (acpi_disabled) |
d550d98d | 286 | return 0; |
1da177e4 | 287 | |
864bdfb9 ZR |
288 | /* create genetlink for acpi event */ |
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 | ||
14e04fb3 | 294 | #ifdef CONFIG_ACPI_PROC_EVENT |
1da177e4 | 295 | /* 'event' [R] */ |
cf7acfab DL |
296 | entry = proc_create("event", S_IRUSR, acpi_root_dir, |
297 | &acpi_system_event_ops); | |
298 | if (!entry) | |
864bdfb9 | 299 | return -ENODEV; |
14e04fb3 | 300 | #endif |
864bdfb9 ZR |
301 | |
302 | return 0; | |
1da177e4 LT |
303 | } |
304 | ||
864bdfb9 | 305 | fs_initcall(acpi_event_init); |