pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / acpi / event.c
blob5c95863f8fa9f324c0b98d88cd40f96eb16f9ead
1 /*
2 * event.c - exporting ACPI events via procfs
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 */
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>
14 #include <net/netlink.h>
15 #include <net/genetlink.h>
17 #define _COMPONENT ACPI_SYSTEM_COMPONENT
18 ACPI_MODULE_NAME("event");
20 #ifdef CONFIG_ACPI_PROC_EVENT
21 /* Global vars for handling event proc entry */
22 static DEFINE_SPINLOCK(acpi_system_event_lock);
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;
27 static int acpi_system_open_event(struct inode *inode, struct file *file)
29 spin_lock_irq(&acpi_system_event_lock);
31 if (event_is_open)
32 goto out_busy;
34 event_is_open = 1;
36 spin_unlock_irq(&acpi_system_event_lock);
37 return 0;
39 out_busy:
40 spin_unlock_irq(&acpi_system_event_lock);
41 return -EBUSY;
44 static ssize_t
45 acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
46 loff_t * ppos)
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;
54 if (!chars_remaining) {
55 memset(&event, 0, sizeof(struct acpi_bus_event));
57 if ((file->f_flags & O_NONBLOCK)
58 && (list_empty(&acpi_bus_event_list)))
59 return -EAGAIN;
61 result = acpi_bus_receive_event(&event);
62 if (result)
63 return result;
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);
71 ptr = str;
74 if (chars_remaining < count) {
75 count = chars_remaining;
78 if (copy_to_user(buffer, ptr, count))
79 return -EFAULT;
81 *ppos += count;
82 chars_remaining -= count;
83 ptr += count;
85 return count;
88 static int acpi_system_close_event(struct inode *inode, struct file *file)
90 spin_lock_irq(&acpi_system_event_lock);
91 event_is_open = 0;
92 spin_unlock_irq(&acpi_system_event_lock);
93 return 0;
96 static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
98 poll_wait(file, &acpi_bus_event_queue, wait);
99 if (!list_empty(&acpi_bus_event_list))
100 return POLLIN | POLLRDNORM;
101 return 0;
104 static const struct file_operations acpi_system_event_ops = {
105 .open = acpi_system_open_event,
106 .read = acpi_system_read_event,
107 .release = acpi_system_close_event,
108 .poll = acpi_system_poll_event,
110 #endif /* CONFIG_ACPI_PROC_EVENT */
112 #ifdef CONFIG_NET
113 static unsigned int acpi_event_seqnum;
114 struct acpi_genl_event {
115 acpi_device_class device_class;
116 char bus_id[15];
117 u32 type;
118 u32 data;
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,
127 #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
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,
135 #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
137 #define ACPI_GENL_FAMILY_NAME "acpi_event"
138 #define ACPI_GENL_VERSION 0x01
139 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
141 static struct genl_family acpi_event_genl_family = {
142 .id = GENL_ID_GENERATE,
143 .name = ACPI_GENL_FAMILY_NAME,
144 .version = ACPI_GENL_VERSION,
145 .maxattr = ACPI_GENL_ATTR_MAX,
148 static struct genl_multicast_group acpi_event_mcgrp = {
149 .name = ACPI_GENL_MCAST_GROUP_NAME,
152 int acpi_bus_generate_netlink_event(const char *device_class,
153 const char *bus_id,
154 u8 type, int data)
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;
163 /* allocate memory */
164 size = nla_total_size(sizeof(struct acpi_genl_event)) +
165 nla_total_size(0);
167 skb = genlmsg_new(size, GFP_ATOMIC);
168 if (!skb)
169 return -ENOMEM;
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;
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;
189 event = nla_data(attr);
190 if (!event) {
191 nlmsg_free(skb);
192 return -EINVAL;
195 memset(event, 0, sizeof(struct acpi_genl_event));
197 strcpy(event->device_class, device_class);
198 strcpy(event->bus_id, bus_id);
199 event->type = type;
200 event->data = data;
202 /* send multicast genetlink message */
203 result = genlmsg_end(skb, msg_header);
204 if (result < 0) {
205 nlmsg_free(skb);
206 return result;
209 result =
210 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
211 if (result)
212 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
213 "Failed to send a Genetlink message!\n"));
214 return 0;
217 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
219 static int acpi_event_genetlink_init(void)
221 int result;
223 result = genl_register_family(&acpi_event_genl_family);
224 if (result)
225 return result;
227 result = genl_register_mc_group(&acpi_event_genl_family,
228 &acpi_event_mcgrp);
229 if (result)
230 genl_unregister_family(&acpi_event_genl_family);
232 return result;
235 #else
236 int acpi_bus_generate_netlink_event(const char *device_class,
237 const char *bus_id,
238 u8 type, int data)
240 return 0;
243 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
245 static int acpi_event_genetlink_init(void)
247 return -ENODEV;
249 #endif
251 static int __init acpi_event_init(void)
253 #ifdef CONFIG_ACPI_PROC_EVENT
254 struct proc_dir_entry *entry;
255 #endif
256 int error = 0;
258 if (acpi_disabled)
259 return 0;
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");
267 #ifdef CONFIG_ACPI_PROC_EVENT
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;
272 else
273 return -ENODEV;
274 #endif
276 return 0;
279 fs_initcall(acpi_event_init);