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