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>
15 #define _COMPONENT ACPI_SYSTEM_COMPONENT
16 ACPI_MODULE_NAME("event");
18 /* Global vars for handling event proc entry */
19 static DEFINE_SPINLOCK(acpi_system_event_lock);
20 int event_is_open = 0;
21 extern struct list_head acpi_bus_event_list;
22 extern wait_queue_head_t acpi_bus_event_queue;
24 static int acpi_system_open_event(struct inode *inode, struct file *file)
26 spin_lock_irq(&acpi_system_event_lock);
33 spin_unlock_irq(&acpi_system_event_lock);
37 spin_unlock_irq(&acpi_system_event_lock);
42 acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
46 struct acpi_bus_event event;
47 static char str[ACPI_MAX_STRING];
48 static int chars_remaining = 0;
52 if (!chars_remaining) {
53 memset(&event, 0, sizeof(struct acpi_bus_event));
55 if ((file->f_flags & O_NONBLOCK)
56 && (list_empty(&acpi_bus_event_list)))
59 result = acpi_bus_receive_event(&event);
63 chars_remaining = sprintf(str, "%s %s %08x %08x\n",
64 event.device_class ? event.
65 device_class : "<unknown>",
67 bus_id : "<unknown>", event.type,
72 if (chars_remaining < count) {
73 count = chars_remaining;
76 if (copy_to_user(buffer, ptr, count))
80 chars_remaining -= count;
86 static int acpi_system_close_event(struct inode *inode, struct file *file)
88 spin_lock_irq(&acpi_system_event_lock);
90 spin_unlock_irq(&acpi_system_event_lock);
94 static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
96 poll_wait(file, &acpi_bus_event_queue, wait);
97 if (!list_empty(&acpi_bus_event_list))
98 return POLLIN | POLLRDNORM;
102 static const struct file_operations acpi_system_event_ops = {
103 .open = acpi_system_open_event,
104 .read = acpi_system_read_event,
105 .release = acpi_system_close_event,
106 .poll = acpi_system_poll_event,
109 static int __init acpi_event_init(void)
111 struct proc_dir_entry *entry;
119 entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
121 entry->proc_fops = &acpi_system_event_ops;
128 subsys_initcall(acpi_event_init);