From 46ec8598fde74ba59703575c22a6fb0b6b151bb6 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Mon, 30 Mar 2009 17:48:13 +0000 Subject: ACPI: support acpi_device_ops .notify methods This patch adds support for ACPI device driver .notify() methods. If such a method is present, Linux/ACPI installs a handler for device notifications (but not for system notifications such as Bus Check, Device Check, etc). When a device notification occurs, Linux/ACPI passes it on to the driver's .notify() method. In most cases, this removes the need for drivers to install their own handlers for device-specific notifications. For fixed hardware devices like some power and sleep buttons, there's no notification value because there's no control method to execute a Notify opcode. When a fixed hardware device generates an event, we handle it the same as a regular device notification, except we send a ACPI_FIXED_HARDWARE_EVENT value. This is outside the normal 0x0-0xff range used by Notify opcodes. Several drivers install their own handlers for system Bus Check and Device Check notifications so they can support hot-plug. This patch doesn't affect that usage. Signed-off-by: Bjorn Helgaas Reviewed-by: Alex Chiang Signed-off-by: Len Brown --- include/acpi/acpi_bus.h | 2 ++ include/acpi/acpi_drivers.h | 10 ++++++++++ 2 files changed, 12 insertions(+) (limited to 'include') diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 08ec60c8366..a2228511d4b 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -95,6 +95,7 @@ typedef int (*acpi_op_suspend) (struct acpi_device * device, typedef int (*acpi_op_resume) (struct acpi_device * device); typedef int (*acpi_op_bind) (struct acpi_device * device); typedef int (*acpi_op_unbind) (struct acpi_device * device); +typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event); struct acpi_bus_ops { u32 acpi_op_add:1; @@ -110,6 +111,7 @@ struct acpi_device_ops { acpi_op_resume resume; acpi_op_bind bind; acpi_op_unbind unbind; + acpi_op_notify notify; }; struct acpi_driver { diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h index 241d227de6c..0352c8f0b05 100644 --- a/include/acpi/acpi_drivers.h +++ b/include/acpi/acpi_drivers.h @@ -67,6 +67,16 @@ #define ACPI_BAY_HID "LNXIOBAY" #define ACPI_DOCK_HID "LNXDOCK" +/* + * For fixed hardware buttons, we fabricate acpi_devices with HID + * ACPI_BUTTON_HID_POWERF or ACPI_BUTTON_HID_SLEEPF. Fixed hardware + * signals only an event; it doesn't supply a notification value. + * To allow drivers to treat notifications from fixed hardware the + * same as those from real devices, we turn the events into this + * notification value. + */ +#define ACPI_FIXED_HARDWARE_EVENT 0x100 + /* -------------------------------------------------------------------------- PCI -------------------------------------------------------------------------- */ -- cgit v1.2.3-70-g09d2