Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9ee85241fdaab358dff1d8647f20a478cfa512a1
Commit:     9ee85241fdaab358dff1d8647f20a478cfa512a1
Parent:     ba5e1223422368fd2f4dbb0745f5fbb5fe9a65f1
Author:     Zhang Rui <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 25 14:48:06 2008 +0800
Committer:  Len Brown <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 03:22:57 2008 -0500

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Len Brown <[EMAIL PROTECTED]>
---
 drivers/acpi/event.c    |   28 ++++++++++++++++++++++++++++
 include/acpi/acpi_bus.h |    3 +++
 2 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index 5c95863..5479dc0 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 fb7171b..3f9f141 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
  */
-
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