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> | |
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 = { |
4be44fcd LB |
105 | .open = acpi_system_open_event, |
106 | .read = acpi_system_read_event, | |
107 | .release = acpi_system_close_event, | |
108 | .poll = acpi_system_poll_event, | |
1da177e4 | 109 | }; |
14e04fb3 | 110 | #endif /* CONFIG_ACPI_PROC_EVENT */ |
1da177e4 | 111 | |
864bdfb9 | 112 | #ifdef CONFIG_NET |
e13d8747 | 113 | static unsigned int acpi_event_seqnum; |
864bdfb9 ZR |
114 | struct acpi_genl_event { |
115 | acpi_device_class device_class; | |
116 | char bus_id[15]; | |
117 | u32 type; | |
118 | u32 data; | |
119 | }; | |
120 | ||
121 | /* attributes of acpi_genl_family */ | |
122 | enum { | |
123 | ACPI_GENL_ATTR_UNSPEC, | |
124 | ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ | |
125 | __ACPI_GENL_ATTR_MAX, | |
126 | }; | |
127 | #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) | |
128 | ||
129 | /* commands supported by the acpi_genl_family */ | |
130 | enum { | |
131 | ACPI_GENL_CMD_UNSPEC, | |
132 | ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ | |
133 | __ACPI_GENL_CMD_MAX, | |
134 | }; | |
135 | #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) | |
136 | ||
9c977a45 ZR |
137 | #define ACPI_GENL_FAMILY_NAME "acpi_event" |
138 | #define ACPI_GENL_VERSION 0x01 | |
139 | #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" | |
864bdfb9 ZR |
140 | |
141 | static struct genl_family acpi_event_genl_family = { | |
142 | .id = GENL_ID_GENERATE, | |
9c977a45 | 143 | .name = ACPI_GENL_FAMILY_NAME, |
864bdfb9 ZR |
144 | .version = ACPI_GENL_VERSION, |
145 | .maxattr = ACPI_GENL_ATTR_MAX, | |
146 | }; | |
147 | ||
9c977a45 ZR |
148 | static struct genl_multicast_group acpi_event_mcgrp = { |
149 | .name = ACPI_GENL_MCAST_GROUP_NAME, | |
864bdfb9 ZR |
150 | }; |
151 | ||
962ce8ca ZR |
152 | int acpi_bus_generate_netlink_event(const char *device_class, |
153 | const char *bus_id, | |
864bdfb9 ZR |
154 | u8 type, int data) |
155 | { | |
156 | struct sk_buff *skb; | |
157 | struct nlattr *attr; | |
158 | struct acpi_genl_event *event; | |
159 | void *msg_header; | |
160 | int size; | |
161 | int result; | |
162 | ||
163 | /* allocate memory */ | |
164 | size = nla_total_size(sizeof(struct acpi_genl_event)) + | |
165 | nla_total_size(0); | |
166 | ||
167 | skb = genlmsg_new(size, GFP_ATOMIC); | |
168 | if (!skb) | |
169 | return -ENOMEM; | |
170 | ||
171 | /* add the genetlink message header */ | |
172 | msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++, | |
173 | &acpi_event_genl_family, 0, | |
174 | ACPI_GENL_CMD_EVENT); | |
175 | if (!msg_header) { | |
176 | nlmsg_free(skb); | |
177 | return -ENOMEM; | |
178 | } | |
179 | ||
180 | /* fill the data */ | |
181 | attr = | |
182 | nla_reserve(skb, ACPI_GENL_ATTR_EVENT, | |
183 | sizeof(struct acpi_genl_event)); | |
184 | if (!attr) { | |
185 | nlmsg_free(skb); | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
189 | event = nla_data(attr); | |
190 | if (!event) { | |
191 | nlmsg_free(skb); | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | memset(event, 0, sizeof(struct acpi_genl_event)); | |
196 | ||
962ce8ca ZR |
197 | strcpy(event->device_class, device_class); |
198 | strcpy(event->bus_id, bus_id); | |
864bdfb9 ZR |
199 | event->type = type; |
200 | event->data = data; | |
201 | ||
202 | /* send multicast genetlink message */ | |
203 | result = genlmsg_end(skb, msg_header); | |
204 | if (result < 0) { | |
205 | nlmsg_free(skb); | |
206 | return result; | |
207 | } | |
208 | ||
209 | result = | |
9c977a45 | 210 | genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC); |
864bdfb9 ZR |
211 | if (result) |
212 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
213 | "Failed to send a Genetlink message!\n")); | |
214 | return 0; | |
215 | } | |
864bdfb9 | 216 | |
962ce8ca ZR |
217 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
218 | ||
864bdfb9 ZR |
219 | static int acpi_event_genetlink_init(void) |
220 | { | |
221 | int result; | |
222 | ||
223 | result = genl_register_family(&acpi_event_genl_family); | |
224 | if (result) | |
225 | return result; | |
226 | ||
9c977a45 ZR |
227 | result = genl_register_mc_group(&acpi_event_genl_family, |
228 | &acpi_event_mcgrp); | |
864bdfb9 ZR |
229 | if (result) |
230 | genl_unregister_family(&acpi_event_genl_family); | |
231 | ||
232 | return result; | |
233 | } | |
234 | ||
235 | #else | |
3e069ee0 LB |
236 | int acpi_bus_generate_netlink_event(const char *device_class, |
237 | const char *bus_id, | |
238 | u8 type, int data) | |
864bdfb9 ZR |
239 | { |
240 | return 0; | |
241 | } | |
864bdfb9 | 242 | |
66baf327 | 243 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
962ce8ca | 244 | |
864bdfb9 ZR |
245 | static int acpi_event_genetlink_init(void) |
246 | { | |
247 | return -ENODEV; | |
248 | } | |
249 | #endif | |
250 | ||
1da177e4 LT |
251 | static int __init acpi_event_init(void) |
252 | { | |
14e04fb3 | 253 | #ifdef CONFIG_ACPI_PROC_EVENT |
4be44fcd | 254 | struct proc_dir_entry *entry; |
14e04fb3 | 255 | #endif |
1da177e4 LT |
256 | int error = 0; |
257 | ||
1da177e4 | 258 | if (acpi_disabled) |
d550d98d | 259 | return 0; |
1da177e4 | 260 | |
864bdfb9 ZR |
261 | /* create genetlink for acpi event */ |
262 | error = acpi_event_genetlink_init(); | |
263 | if (error) | |
264 | printk(KERN_WARNING PREFIX | |
265 | "Failed to create genetlink family for ACPI event\n"); | |
266 | ||
14e04fb3 | 267 | #ifdef CONFIG_ACPI_PROC_EVENT |
1da177e4 LT |
268 | /* 'event' [R] */ |
269 | entry = create_proc_entry("event", S_IRUSR, acpi_root_dir); | |
270 | if (entry) | |
271 | entry->proc_fops = &acpi_system_event_ops; | |
864bdfb9 ZR |
272 | else |
273 | return -ENODEV; | |
14e04fb3 | 274 | #endif |
864bdfb9 ZR |
275 | |
276 | return 0; | |
1da177e4 LT |
277 | } |
278 | ||
864bdfb9 | 279 | fs_initcall(acpi_event_init); |