Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/drivers/acpi/event.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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File size: 3031 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 3031 byte(s)
Tag kernel26-2.6.12-alx-r9
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> |
14 | |
15 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
16 | ACPI_MODULE_NAME ("event") |
17 | |
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; |
23 | |
24 | static int |
25 | acpi_system_open_event(struct inode *inode, struct file *file) |
26 | { |
27 | spin_lock_irq (&acpi_system_event_lock); |
28 | |
29 | if(event_is_open) |
30 | goto out_busy; |
31 | |
32 | event_is_open = 1; |
33 | |
34 | spin_unlock_irq (&acpi_system_event_lock); |
35 | return 0; |
36 | |
37 | out_busy: |
38 | spin_unlock_irq (&acpi_system_event_lock); |
39 | return -EBUSY; |
40 | } |
41 | |
42 | static ssize_t |
43 | acpi_system_read_event ( |
44 | struct file *file, |
45 | char __user *buffer, |
46 | size_t count, |
47 | loff_t *ppos) |
48 | { |
49 | int result = 0; |
50 | struct acpi_bus_event event; |
51 | static char str[ACPI_MAX_STRING]; |
52 | static int chars_remaining = 0; |
53 | static char *ptr; |
54 | |
55 | |
56 | ACPI_FUNCTION_TRACE("acpi_system_read_event"); |
57 | |
58 | if (!chars_remaining) { |
59 | memset(&event, 0, sizeof(struct acpi_bus_event)); |
60 | |
61 | if ((file->f_flags & O_NONBLOCK) |
62 | && (list_empty(&acpi_bus_event_list))) |
63 | return_VALUE(-EAGAIN); |
64 | |
65 | result = acpi_bus_receive_event(&event); |
66 | if (result) { |
67 | return_VALUE(-EIO); |
68 | } |
69 | |
70 | chars_remaining = sprintf(str, "%s %s %08x %08x\n", |
71 | event.device_class?event.device_class:"<unknown>", |
72 | event.bus_id?event.bus_id:"<unknown>", |
73 | event.type, event.data); |
74 | ptr = str; |
75 | } |
76 | |
77 | if (chars_remaining < count) { |
78 | count = chars_remaining; |
79 | } |
80 | |
81 | if (copy_to_user(buffer, ptr, count)) |
82 | return_VALUE(-EFAULT); |
83 | |
84 | *ppos += count; |
85 | chars_remaining -= count; |
86 | ptr += count; |
87 | |
88 | return_VALUE(count); |
89 | } |
90 | |
91 | static int |
92 | acpi_system_close_event(struct inode *inode, struct file *file) |
93 | { |
94 | spin_lock_irq (&acpi_system_event_lock); |
95 | event_is_open = 0; |
96 | spin_unlock_irq (&acpi_system_event_lock); |
97 | return 0; |
98 | } |
99 | |
100 | static unsigned int |
101 | acpi_system_poll_event( |
102 | struct file *file, |
103 | poll_table *wait) |
104 | { |
105 | poll_wait(file, &acpi_bus_event_queue, wait); |
106 | if (!list_empty(&acpi_bus_event_list)) |
107 | return POLLIN | POLLRDNORM; |
108 | return 0; |
109 | } |
110 | |
111 | static struct file_operations acpi_system_event_ops = { |
112 | .open = acpi_system_open_event, |
113 | .read = acpi_system_read_event, |
114 | .release = acpi_system_close_event, |
115 | .poll = acpi_system_poll_event, |
116 | }; |
117 | |
118 | static int __init acpi_event_init(void) |
119 | { |
120 | struct proc_dir_entry *entry; |
121 | int error = 0; |
122 | |
123 | ACPI_FUNCTION_TRACE("acpi_event_init"); |
124 | |
125 | if (acpi_disabled) |
126 | return_VALUE(0); |
127 | |
128 | /* 'event' [R] */ |
129 | entry = create_proc_entry("event", S_IRUSR, acpi_root_dir); |
130 | if (entry) |
131 | entry->proc_fops = &acpi_system_event_ops; |
132 | else { |
133 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
134 | "Unable to create '%s' proc fs entry\n","event" )); |
135 | error = -EFAULT; |
136 | } |
137 | return_VALUE(error); |
138 | } |
139 | |
140 | subsys_initcall(acpi_event_init); |