From: Zhang Rui <rui.zhang@intel.com>
Date: Fri, 25 Jan 2008 06:48:06 +0000 (+0800)
Subject: ACPI: create notifier chain to get hotkey events to graphics driver
X-Git-Tag: v2.6.25-rc1~297^2~3^2~2^3~3
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ee85241fdaab358dff1d8647f20a478cfa512a1;p=linux-2.6

ACPI: create notifier chain to get hotkey events to graphics driver

Kernel mode graphics drivers need this ACPI notifier chaine
so that they can get notified upon hotkey events.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index 5c95863f8f..5479dc0eee 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -109,6 +109,34 @@ static const struct file_operations acpi_system_event_ops = {
 };
 #endif	/* CONFIG_ACPI_PROC_EVENT */
 
+/* ACPI notifier chain */
+BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
+
+int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
+{
+	struct acpi_bus_event event;
+
+	strcpy(event.device_class, dev->pnp.device_class);
+	strcpy(event.bus_id, dev->pnp.bus_id);
+	event.type = type;
+	event.data = data;
+	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
+                        == NOTIFY_BAD) ? -EINVAL : 0;
+}
+EXPORT_SYMBOL(acpi_notifier_call_chain);
+
+int register_acpi_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&acpi_chain_head, nb);
+}
+EXPORT_SYMBOL(register_acpi_notifier);
+
+int unregister_acpi_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
+}
+EXPORT_SYMBOL(unregister_acpi_notifier);
+
 #ifdef CONFIG_NET
 static unsigned int acpi_event_seqnum;
 struct acpi_genl_event {
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index fb7171b1bd..3f9f1417ff 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -321,6 +321,9 @@ struct acpi_bus_event {
 
 extern struct kobject *acpi_kobj;
 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
+extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
+extern int register_acpi_notifier(struct notifier_block *);
+extern int unregister_acpi_notifier(struct notifier_block *);
 /*
  * External Functions
  */