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authorBjorn Helgaas <bjorn.helgaas@hp.com>2009-03-30 21:48:13 +0400
committerLen Brown <len.brown@intel.com>2009-04-05 10:25:07 +0400
commit46ec8598fde74ba59703575c22a6fb0b6b151bb6 (patch)
tree21936a8b188c58e69e2bd5d951df28e6e05930fa /include/acpi/acpi_drivers.h
parent478c6a43fcbc6c11609f8cee7c7b57223907754f (diff)
downloadlinux-46ec8598fde74ba59703575c22a6fb0b6b151bb6.tar.xz
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 <bjorn.helgaas@hp.com> Reviewed-by: Alex Chiang <achiang@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include/acpi/acpi_drivers.h')
-rw-r--r--include/acpi/acpi_drivers.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h
index 241d227de6c0..0352c8f0b05b 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
-------------------------------------------------------------------------- */