diff options
| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2009-03-30 17:48:13 +0000 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-04-05 02:25:07 -0400 |
| commit | 46ec8598fde74ba59703575c22a6fb0b6b151bb6 (patch) | |
| tree | 21936a8b188c58e69e2bd5d951df28e6e05930fa /include/acpi/acpi_drivers.h | |
| parent | 478c6a43fcbc6c11609f8cee7c7b57223907754f (diff) | |
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.h | 10 |
1 files changed, 10 insertions, 0 deletions
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 -------------------------------------------------------------------------- */ |