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);