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