Commit | Line | Data |
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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> | |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
1da177e4 | 14 | #include <acpi/acpi_drivers.h> |
864bdfb9 ZR |
15 | #include <net/netlink.h> |
16 | #include <net/genetlink.h> | |
1da177e4 | 17 | |
a192a958 LB |
18 | #include "internal.h" |
19 | ||
1da177e4 | 20 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
f52fd66d | 21 | ACPI_MODULE_NAME("event"); |
1da177e4 | 22 | |
14e04fb3 | 23 | #ifdef CONFIG_ACPI_PROC_EVENT |
1da177e4 LT |
24 | /* Global vars for handling event proc entry */ |
25 | static DEFINE_SPINLOCK(acpi_system_event_lock); | |
4be44fcd LB |
26 | int event_is_open = 0; |
27 | extern struct list_head acpi_bus_event_list; | |
28 | extern wait_queue_head_t acpi_bus_event_queue; | |
1da177e4 | 29 | |
4be44fcd | 30 | static int acpi_system_open_event(struct inode *inode, struct file *file) |
1da177e4 | 31 | { |
c65ade4d | 32 | spin_lock_irq(&acpi_system_event_lock); |
1da177e4 | 33 | |
c65ade4d | 34 | if (event_is_open) |
1da177e4 LT |
35 | goto out_busy; |
36 | ||
37 | event_is_open = 1; | |
38 | ||
c65ade4d | 39 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
40 | return 0; |
41 | ||
4be44fcd | 42 | out_busy: |
c65ade4d | 43 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
44 | return -EBUSY; |
45 | } | |
46 | ||
47 | static ssize_t | |
4be44fcd LB |
48 | acpi_system_read_event(struct file *file, char __user * buffer, size_t count, |
49 | loff_t * ppos) | |
1da177e4 | 50 | { |
4be44fcd LB |
51 | int result = 0; |
52 | struct acpi_bus_event event; | |
53 | static char str[ACPI_MAX_STRING]; | |
54 | static int chars_remaining = 0; | |
55 | static char *ptr; | |
1da177e4 | 56 | |
1da177e4 LT |
57 | if (!chars_remaining) { |
58 | memset(&event, 0, sizeof(struct acpi_bus_event)); | |
59 | ||
60 | if ((file->f_flags & O_NONBLOCK) | |
61 | && (list_empty(&acpi_bus_event_list))) | |
d550d98d | 62 | return -EAGAIN; |
1da177e4 LT |
63 | |
64 | result = acpi_bus_receive_event(&event); | |
5cc9eeef | 65 | if (result) |
d550d98d | 66 | return result; |
1da177e4 | 67 | |
4be44fcd LB |
68 | chars_remaining = sprintf(str, "%s %s %08x %08x\n", |
69 | event.device_class ? event. | |
70 | device_class : "<unknown>", | |
71 | event.bus_id ? event. | |
72 | bus_id : "<unknown>", event.type, | |
73 | event.data); | |
1da177e4 LT |
74 | ptr = str; |
75 | } | |
76 | ||
77 | if (chars_remaining < count) { | |
78 | count = chars_remaining; | |
79 | } | |
80 | ||
81 | if (copy_to_user(buffer, ptr, count)) | |
d550d98d | 82 | return -EFAULT; |
1da177e4 LT |
83 | |
84 | *ppos += count; | |
85 | chars_remaining -= count; | |
86 | ptr += count; | |
87 | ||
d550d98d | 88 | return count; |
1da177e4 LT |
89 | } |
90 | ||
4be44fcd | 91 | static int acpi_system_close_event(struct inode *inode, struct file *file) |
1da177e4 | 92 | { |
4be44fcd | 93 | spin_lock_irq(&acpi_system_event_lock); |
1da177e4 | 94 | event_is_open = 0; |
4be44fcd | 95 | spin_unlock_irq(&acpi_system_event_lock); |
1da177e4 LT |
96 | return 0; |
97 | } | |
98 | ||
4be44fcd | 99 | static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait) |
1da177e4 LT |
100 | { |
101 | poll_wait(file, &acpi_bus_event_queue, wait); | |
102 | if (!list_empty(&acpi_bus_event_list)) | |
103 | return POLLIN | POLLRDNORM; | |
104 | return 0; | |
105 | } | |
106 | ||
d7508032 | 107 | static const struct file_operations acpi_system_event_ops = { |
cf7acfab | 108 | .owner = THIS_MODULE, |
4be44fcd LB |
109 | .open = acpi_system_open_event, |
110 | .read = acpi_system_read_event, | |
111 | .release = acpi_system_close_event, | |
112 | .poll = acpi_system_poll_event, | |
1da177e4 | 113 | }; |
14e04fb3 | 114 | #endif /* CONFIG_ACPI_PROC_EVENT */ |
1da177e4 | 115 | |
9ee85241 | 116 | /* ACPI notifier chain */ |
c8e773fa | 117 | static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); |
9ee85241 ZR |
118 | |
119 | int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data) | |
120 | { | |
121 | struct acpi_bus_event event; | |
122 | ||
123 | strcpy(event.device_class, dev->pnp.device_class); | |
124 | strcpy(event.bus_id, dev->pnp.bus_id); | |
125 | event.type = type; | |
126 | event.data = data; | |
127 | return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event) | |
128 | == NOTIFY_BAD) ? -EINVAL : 0; | |
129 | } | |
130 | EXPORT_SYMBOL(acpi_notifier_call_chain); | |
131 | ||
132 | int register_acpi_notifier(struct notifier_block *nb) | |
133 | { | |
134 | return blocking_notifier_chain_register(&acpi_chain_head, nb); | |
135 | } | |
136 | EXPORT_SYMBOL(register_acpi_notifier); | |
137 | ||
138 | int unregister_acpi_notifier(struct notifier_block *nb) | |
139 | { | |
140 | return blocking_notifier_chain_unregister(&acpi_chain_head, nb); | |
141 | } | |
142 | EXPORT_SYMBOL(unregister_acpi_notifier); | |
143 | ||
864bdfb9 | 144 | #ifdef CONFIG_NET |
e13d8747 | 145 | static unsigned int acpi_event_seqnum; |
864bdfb9 ZR |
146 | struct acpi_genl_event { |
147 | acpi_device_class device_class; | |
148 | char bus_id[15]; | |
149 | u32 type; | |
150 | u32 data; | |
151 | }; | |
152 | ||
153 | /* attributes of acpi_genl_family */ | |
154 | enum { | |
155 | ACPI_GENL_ATTR_UNSPEC, | |
156 | ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ | |
157 | __ACPI_GENL_ATTR_MAX, | |
158 | }; | |
159 | #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) | |
160 | ||
161 | /* commands supported by the acpi_genl_family */ | |
162 | enum { | |
163 | ACPI_GENL_CMD_UNSPEC, | |
164 | ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ | |
165 | __ACPI_GENL_CMD_MAX, | |
166 | }; | |
167 | #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) | |
168 | ||
9c977a45 ZR |
169 | #define ACPI_GENL_FAMILY_NAME "acpi_event" |
170 | #define ACPI_GENL_VERSION 0x01 | |
171 | #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" | |
864bdfb9 ZR |
172 | |
173 | static struct genl_family acpi_event_genl_family = { | |
174 | .id = GENL_ID_GENERATE, | |
9c977a45 | 175 | .name = ACPI_GENL_FAMILY_NAME, |
864bdfb9 ZR |
176 | .version = ACPI_GENL_VERSION, |
177 | .maxattr = ACPI_GENL_ATTR_MAX, | |
178 | }; | |
179 | ||
9c977a45 ZR |
180 | static struct genl_multicast_group acpi_event_mcgrp = { |
181 | .name = ACPI_GENL_MCAST_GROUP_NAME, | |
864bdfb9 ZR |
182 | }; |
183 | ||
962ce8ca ZR |
184 | int acpi_bus_generate_netlink_event(const char *device_class, |
185 | const char *bus_id, | |
864bdfb9 ZR |
186 | u8 type, int data) |
187 | { | |
188 | struct sk_buff *skb; | |
189 | struct nlattr *attr; | |
190 | struct acpi_genl_event *event; | |
191 | void *msg_header; | |
192 | int size; | |
193 | int result; | |
194 | ||
195 | /* allocate memory */ | |
196 | size = nla_total_size(sizeof(struct acpi_genl_event)) + | |
197 | nla_total_size(0); | |
198 | ||
199 | skb = genlmsg_new(size, GFP_ATOMIC); | |
200 | if (!skb) | |
201 | return -ENOMEM; | |
202 | ||
203 | /* add the genetlink message header */ | |
204 | msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++, | |
205 | &acpi_event_genl_family, 0, | |
206 | ACPI_GENL_CMD_EVENT); | |
207 | if (!msg_header) { | |
208 | nlmsg_free(skb); | |
209 | return -ENOMEM; | |
210 | } | |
211 | ||
212 | /* fill the data */ | |
213 | attr = | |
214 | nla_reserve(skb, ACPI_GENL_ATTR_EVENT, | |
215 | sizeof(struct acpi_genl_event)); | |
216 | if (!attr) { | |
217 | nlmsg_free(skb); | |
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | event = nla_data(attr); | |
222 | if (!event) { | |
223 | nlmsg_free(skb); | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
227 | memset(event, 0, sizeof(struct acpi_genl_event)); | |
228 | ||
962ce8ca ZR |
229 | strcpy(event->device_class, device_class); |
230 | strcpy(event->bus_id, bus_id); | |
864bdfb9 ZR |
231 | event->type = type; |
232 | event->data = data; | |
233 | ||
234 | /* send multicast genetlink message */ | |
235 | result = genlmsg_end(skb, msg_header); | |
236 | if (result < 0) { | |
237 | nlmsg_free(skb); | |
238 | return result; | |
239 | } | |
240 | ||
ff491a73 | 241 | genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC); |
864bdfb9 ZR |
242 | return 0; |
243 | } | |
864bdfb9 | 244 | |
962ce8ca ZR |
245 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
246 | ||
864bdfb9 ZR |
247 | static int acpi_event_genetlink_init(void) |
248 | { | |
249 | int result; | |
250 | ||
251 | result = genl_register_family(&acpi_event_genl_family); | |
252 | if (result) | |
253 | return result; | |
254 | ||
9c977a45 ZR |
255 | result = genl_register_mc_group(&acpi_event_genl_family, |
256 | &acpi_event_mcgrp); | |
864bdfb9 ZR |
257 | if (result) |
258 | genl_unregister_family(&acpi_event_genl_family); | |
259 | ||
260 | return result; | |
261 | } | |
262 | ||
263 | #else | |
3e069ee0 LB |
264 | int acpi_bus_generate_netlink_event(const char *device_class, |
265 | const char *bus_id, | |
266 | u8 type, int data) | |
864bdfb9 ZR |
267 | { |
268 | return 0; | |
269 | } | |
864bdfb9 | 270 | |
66baf327 | 271 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
962ce8ca | 272 | |
864bdfb9 ZR |
273 | static int acpi_event_genetlink_init(void) |
274 | { | |
275 | return -ENODEV; | |
276 | } | |
277 | #endif | |
278 | ||
1da177e4 LT |
279 | static int __init acpi_event_init(void) |
280 | { | |
14e04fb3 | 281 | #ifdef CONFIG_ACPI_PROC_EVENT |
4be44fcd | 282 | struct proc_dir_entry *entry; |
14e04fb3 | 283 | #endif |
1da177e4 LT |
284 | int error = 0; |
285 | ||
1da177e4 | 286 | if (acpi_disabled) |
d550d98d | 287 | return 0; |
1da177e4 | 288 | |
864bdfb9 ZR |
289 | /* create genetlink for acpi event */ |
290 | error = acpi_event_genetlink_init(); | |
291 | if (error) | |
292 | printk(KERN_WARNING PREFIX | |
293 | "Failed to create genetlink family for ACPI event\n"); | |
294 | ||
14e04fb3 | 295 | #ifdef CONFIG_ACPI_PROC_EVENT |
1da177e4 | 296 | /* 'event' [R] */ |
cf7acfab DL |
297 | entry = proc_create("event", S_IRUSR, acpi_root_dir, |
298 | &acpi_system_event_ops); | |
299 | if (!entry) | |
864bdfb9 | 300 | return -ENODEV; |
14e04fb3 | 301 | #endif |
864bdfb9 ZR |
302 | |
303 | return 0; | |
1da177e4 LT |
304 | } |
305 | ||
864bdfb9 | 306 | fs_initcall(acpi_event_init); |