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;
51 ACPI_FUNCTION_TRACE("acpi_system_read_event");
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)))
58 return_VALUE(-EAGAIN);
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))
78 return_VALUE(-EFAULT);
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 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,
110 static int __init acpi_event_init(void)
112 struct proc_dir_entry *entry;
115 ACPI_FUNCTION_TRACE("acpi_event_init");
121 entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
123 entry->proc_fops = &acpi_system_event_ops;
125 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
126 "Unable to create '%s' proc fs entry\n",
133 subsys_initcall(acpi_event_init);