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Commit 6d278131 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Len Brown
Browse files

ACPI: allow drivers to request both device and system notify events 



System notify events (0x00-0x7f) are common across all device types
and should be handled in Linux/ACPI, not in drivers.  However, some
BIOSes use system notify events in device-specific ways that require
the driver to be involved.

This patch adds a ACPI_DRIVER_ALL_NOTIFY_EVENTS driver flag.  When a
driver sets this flag and supplies a .notify method, Linux/ACPI calls
the .notify method for ALL notify events on the device, not just the
device-specific (0x80-0xff) events.

Signed-off-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 07a2039b

drivers/acpi/bus.c

+5 −1
Original line number Diff line number Diff line
@@ -549,6 +549,7 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 
{

	int result = 0;

	struct acpi_device *device = NULL;

	struct acpi_driver *driver;



	blocking_notifier_call_chain(&acpi_bus_notify_list,

		type, (void *)handle);
@@ -629,7 +630,10 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 
		break;

	}



	return;

	driver = device->driver;

	if (driver && driver->ops.notify &&

	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))

		driver->ops.notify(device, type);

}



/* --------------------------------------------------------------------------

include/acpi/acpi_bus.h

+3 −0
Original line number Diff line number Diff line
@@ -114,10 +114,13 @@ struct acpi_device_ops { 
	acpi_op_notify notify;

};



#define ACPI_DRIVER_ALL_NOTIFY_EVENTS	0x1	/* system AND device events */



struct acpi_driver {

	char name[80];

	char class[80];

	const struct acpi_device_id *ids; /* Supported Hardware IDs */

	unsigned int flags;

	struct acpi_device_ops ops;

	struct device_driver drv;

	struct module *owner;