ACPI: allow drivers to request both device and system notify events (6d278131) · Commits · 戴 / test

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:

Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by:

Len Brown <len.brown@intel.com>

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;

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