From: Zhang Rui <[EMAIL PROTECTED]>
This patch is needed by the kernel mode graphics drivers.
Create an ACPI notifier chain so that they can get
notified upon hotkey events.
Signed-off-by: Zhang Rui <[EMAIL PROTECTED]>
---
drivers/acpi/event.c | 28 ++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 3 +++
2 files changed, 31 insertions(+)
Index: linux-2.6/drivers/acpi/event.c
===================================================================
--- linux-2.6.orig/drivers/acpi/event.c
+++ linux-2.6/drivers/acpi/event.c
@@ -109,6 +109,34 @@ static const struct file_operations acpi
};
#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 {
Index: linux-2.6/include/acpi/acpi_bus.h
===================================================================
--- linux-2.6.orig/include/acpi/acpi_bus.h
+++ linux-2.6/include/acpi/acpi_bus.h
@@ -320,6 +320,9 @@ struct acpi_bus_event {
extern struct kset acpi_subsys;
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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