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>
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 /* Global vars for handling event proc entry */
21 static DEFINE_SPINLOCK(acpi_system_event_lock);
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;
26 static int acpi_system_open_event(struct inode *inode, struct file *file)
28 spin_lock_irq(&acpi_system_event_lock);
35 spin_unlock_irq(&acpi_system_event_lock);
39 spin_unlock_irq(&acpi_system_event_lock);
44 acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
48 struct acpi_bus_event event;
49 static char str[ACPI_MAX_STRING];
50 static int chars_remaining = 0;
53 if (!chars_remaining) {
54 memset(&event, 0, sizeof(struct acpi_bus_event));
56 if ((file->f_flags & O_NONBLOCK)
57 && (list_empty(&acpi_bus_event_list)))
60 result = acpi_bus_receive_event(&event);
64 chars_remaining = sprintf(str, "%s %s %08x %08x\n",
65 event.device_class ? event.
66 device_class : "<unknown>",
68 bus_id : "<unknown>", event.type,
73 if (chars_remaining < count) {
74 count = chars_remaining;
77 if (copy_to_user(buffer, ptr, count))
81 chars_remaining -= count;
87 static int acpi_system_close_event(struct inode *inode, struct file *file)
89 spin_lock_irq(&acpi_system_event_lock);
91 spin_unlock_irq(&acpi_system_event_lock);
95 static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
97 poll_wait(file, &acpi_bus_event_queue, wait);
98 if (!list_empty(&acpi_bus_event_list))
99 return POLLIN | POLLRDNORM;
103 static const struct file_operations acpi_system_event_ops = {
104 .open = acpi_system_open_event,
105 .read = acpi_system_read_event,
106 .release = acpi_system_close_event,
107 .poll = acpi_system_poll_event,
111 static unsigned int acpi_event_seqnum;
112 struct acpi_genl_event {
113 acpi_device_class device_class;
119 /* attributes of acpi_genl_family */
121 ACPI_GENL_ATTR_UNSPEC,
122 ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
123 __ACPI_GENL_ATTR_MAX,
125 #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
127 /* commands supported by the acpi_genl_family */
129 ACPI_GENL_CMD_UNSPEC,
130 ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
133 #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
135 #define ACPI_GENL_FAMILY_NAME "acpi_event"
136 #define ACPI_GENL_VERSION 0x01
137 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
139 static struct genl_family acpi_event_genl_family = {
140 .id = GENL_ID_GENERATE,
141 .name = ACPI_GENL_FAMILY_NAME,
142 .version = ACPI_GENL_VERSION,
143 .maxattr = ACPI_GENL_ATTR_MAX,
146 static struct genl_multicast_group acpi_event_mcgrp = {
147 .name = ACPI_GENL_MCAST_GROUP_NAME,
150 int acpi_bus_generate_netlink_event(const char *device_class,
156 struct acpi_genl_event *event;
161 /* allocate memory */
162 size = nla_total_size(sizeof(struct acpi_genl_event)) +
165 skb = genlmsg_new(size, GFP_ATOMIC);
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);
180 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
181 sizeof(struct acpi_genl_event));
187 event = nla_data(attr);
193 memset(event, 0, sizeof(struct acpi_genl_event));
195 strcpy(event->device_class, device_class);
196 strcpy(event->bus_id, bus_id);
200 /* send multicast genetlink message */
201 result = genlmsg_end(skb, msg_header);
208 genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
210 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
211 "Failed to send a Genetlink message!\n"));
215 EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
217 static int acpi_event_genetlink_init(void)
221 result = genl_register_family(&acpi_event_genl_family);
225 result = genl_register_mc_group(&acpi_event_genl_family,
228 genl_unregister_family(&acpi_event_genl_family);
234 int acpi_bus_generate_netlink_event(struct acpi_device *device, u8 type,
240 EXPORT_SYMBOL(acpi_generate_netlink_event);
242 static int acpi_event_genetlink_init(void)
248 static int __init acpi_event_init(void)
250 struct proc_dir_entry *entry;
256 /* create genetlink for acpi event */
257 error = acpi_event_genetlink_init();
259 printk(KERN_WARNING PREFIX
260 "Failed to create genetlink family for ACPI event\n");
263 entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
265 entry->proc_fops = &acpi_system_event_ops;
272 fs_initcall(acpi_event_init);