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path: root/drivers/acpi/event.c
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-rw-r--r--drivers/acpi/event.c140
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);