Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 16 | ACPI_MODULE_NAME("event") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | /* Global vars for handling event proc entry */ |
| 19 | static DEFINE_SPINLOCK(acpi_system_event_lock); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 24 | static int acpi_system_open_event(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | { |
Pavel Machek | c65ade4 | 2005-08-05 00:37:45 -0400 | [diff] [blame] | 26 | spin_lock_irq(&acpi_system_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Pavel Machek | c65ade4 | 2005-08-05 00:37:45 -0400 | [diff] [blame] | 28 | if (event_is_open) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | goto out_busy; |
| 30 | |
| 31 | event_is_open = 1; |
| 32 | |
Pavel Machek | c65ade4 | 2005-08-05 00:37:45 -0400 | [diff] [blame] | 33 | spin_unlock_irq(&acpi_system_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | return 0; |
| 35 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 36 | out_busy: |
Pavel Machek | c65ade4 | 2005-08-05 00:37:45 -0400 | [diff] [blame] | 37 | spin_unlock_irq(&acpi_system_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | return -EBUSY; |
| 39 | } |
| 40 | |
| 41 | static ssize_t |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 42 | acpi_system_read_event(struct file *file, char __user * buffer, size_t count, |
| 43 | loff_t * ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 45 | int result = 0; |
| 46 | struct acpi_bus_event event; |
| 47 | static char str[ACPI_MAX_STRING]; |
| 48 | static int chars_remaining = 0; |
| 49 | static char *ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | ACPI_FUNCTION_TRACE("acpi_system_read_event"); |
| 52 | |
| 53 | if (!chars_remaining) { |
| 54 | memset(&event, 0, sizeof(struct acpi_bus_event)); |
| 55 | |
| 56 | if ((file->f_flags & O_NONBLOCK) |
| 57 | && (list_empty(&acpi_bus_event_list))) |
| 58 | return_VALUE(-EAGAIN); |
| 59 | |
| 60 | result = acpi_bus_receive_event(&event); |
Pavel Machek | 5cc9eee | 2005-10-17 16:43:31 -0700 | [diff] [blame] | 61 | if (result) |
| 62 | return_VALUE(result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 64 | chars_remaining = sprintf(str, "%s %s %08x %08x\n", |
| 65 | event.device_class ? event. |
| 66 | device_class : "<unknown>", |
| 67 | event.bus_id ? event. |
| 68 | bus_id : "<unknown>", event.type, |
| 69 | event.data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | ptr = str; |
| 71 | } |
| 72 | |
| 73 | if (chars_remaining < count) { |
| 74 | count = chars_remaining; |
| 75 | } |
| 76 | |
| 77 | if (copy_to_user(buffer, ptr, count)) |
| 78 | return_VALUE(-EFAULT); |
| 79 | |
| 80 | *ppos += count; |
| 81 | chars_remaining -= count; |
| 82 | ptr += count; |
| 83 | |
| 84 | return_VALUE(count); |
| 85 | } |
| 86 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 87 | static int acpi_system_close_event(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 89 | spin_lock_irq(&acpi_system_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | event_is_open = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 91 | spin_unlock_irq(&acpi_system_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | return 0; |
| 93 | } |
| 94 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 95 | static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | poll_wait(file, &acpi_bus_event_queue, wait); |
| 98 | if (!list_empty(&acpi_bus_event_list)) |
| 99 | return POLLIN | POLLRDNORM; |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static struct file_operations acpi_system_event_ops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 104 | .open = acpi_system_open_event, |
| 105 | .read = acpi_system_read_event, |
| 106 | .release = acpi_system_close_event, |
| 107 | .poll = acpi_system_poll_event, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | }; |
| 109 | |
| 110 | static int __init acpi_event_init(void) |
| 111 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 112 | struct proc_dir_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | int error = 0; |
| 114 | |
| 115 | ACPI_FUNCTION_TRACE("acpi_event_init"); |
| 116 | |
| 117 | if (acpi_disabled) |
| 118 | return_VALUE(0); |
| 119 | |
| 120 | /* 'event' [R] */ |
| 121 | entry = create_proc_entry("event", S_IRUSR, acpi_root_dir); |
| 122 | if (entry) |
| 123 | entry->proc_fops = &acpi_system_event_ops; |
| 124 | else { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 125 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 126 | "Unable to create '%s' proc fs entry\n", |
| 127 | "event")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | error = -EFAULT; |
| 129 | } |
| 130 | return_VALUE(error); |
| 131 | } |
| 132 | |
| 133 | subsys_initcall(acpi_event_init); |