1 files changed, 140 insertions, 0 deletions

diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
new file mode 100644
index 000000000000..43c49f66a328
--- /dev/null
+++ b/drivers/acpi/event.c
@@ -0,0 +1,140 @@
+/*
+ * event.c - exporting ACPI events via procfs
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ */
+
+#include <linux/spinlock.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <acpi/acpi_drivers.h>
+
+#define _COMPONENT              ACPI_SYSTEM_COMPONENT
+ACPI_MODULE_NAME                ("event")
+
+/* Global vars for handling event proc entry */
+static DEFINE_SPINLOCK(acpi_system_event_lock);
+int                             event_is_open = 0;
+extern struct list_head         acpi_bus_event_list;
+extern wait_queue_head_t        acpi_bus_event_queue;
+
+static int
+acpi_system_open_event(struct inode *inode, struct file *file)
+{
+        spin_lock_irq (&acpi_system_event_lock);
+
+        if(event_is_open)
+                goto out_busy;
+
+        event_is_open = 1;
+
+        spin_unlock_irq (&acpi_system_event_lock);
+        return 0;
+
+out_busy:
+        spin_unlock_irq (&acpi_system_event_lock);
+        return -EBUSY;
+}
+
+static ssize_t
+acpi_system_read_event (
+        struct file             *file,
+        char                    __user *buffer,
+        size_t                  count,
+        loff_t                  *ppos)
+{
+        int                     result = 0;
+        struct acpi_bus_event   event;
+        static char             str[ACPI_MAX_STRING];
+        static int              chars_remaining = 0;
+        static char             *ptr;
+
+
+        ACPI_FUNCTION_TRACE("acpi_system_read_event");
+
+        if (!chars_remaining) {
+                memset(&event, 0, sizeof(struct acpi_bus_event));
+
+                if ((file->f_flags & O_NONBLOCK)
+                    && (list_empty(&acpi_bus_event_list)))
+                        return_VALUE(-EAGAIN);
+
+                result = acpi_bus_receive_event(&event);
+                if (result) {
+                        return_VALUE(-EIO);
+                }
+
+                chars_remaining = sprintf(str, "%s %s %08x %08x\n", 
+                        event.device_class?event.device_class:"<unknown>",
+                        event.bus_id?event.bus_id:"<unknown>", 
+                        event.type, event.data);
+                ptr = str;
+        }
+
+        if (chars_remaining < count) {
+                count = chars_remaining;
+        }
+
+        if (copy_to_user(buffer, ptr, count))
+                return_VALUE(-EFAULT);
+
+        *ppos += count;
+        chars_remaining -= count;
+        ptr += count;
+
+        return_VALUE(count);
+}
+
+static int
+acpi_system_close_event(struct inode *inode, struct file *file)
+{
+        spin_lock_irq (&acpi_system_event_lock);
+        event_is_open = 0;
+        spin_unlock_irq (&acpi_system_event_lock);
+        return 0;
+}
+
+static unsigned int
+acpi_system_poll_event(
+        struct file             *file,
+        poll_table              *wait)
+{
+        poll_wait(file, &acpi_bus_event_queue, wait);
+        if (!list_empty(&acpi_bus_event_list))
+                return POLLIN | POLLRDNORM;
+        return 0;
+}
+
+static struct file_operations acpi_system_event_ops = {
+        .open =         acpi_system_open_event,
+        .read =         acpi_system_read_event,
+        .release =      acpi_system_close_event,
+        .poll =         acpi_system_poll_event,
+};
+
+static int __init acpi_event_init(void)
+{
+        struct proc_dir_entry   *entry;
+        int error = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_event_init");
+
+        if (acpi_disabled)
+                return_VALUE(0);
+
+        /* 'event' [R] */
+        entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
+        if (entry)
+                entry->proc_fops = &acpi_system_event_ops;
+        else {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
+                                  "Unable to create '%s' proc fs entry\n","event" ));
+                error = -EFAULT;
+        }
+        return_VALUE(error);
+}
+
+subsys_initcall(acpi_event_init);