Add cross-links between ACPI device and "real" devices in sysfs,
exposing otherwise-hidden interrelationships between the various
device nodes for ACPI stuff. As a representative example, one
hardware device is exposed as two logical devices (PNP and ACPI):
.../pnp0/00:06/
.../LNXSYSTM:00/device:00/PNP0A03:00/device:15/PNP0B00:00/
The PNP device gets a "firmware_node" link pointing to the ACPI device,
and is what a Linux device driver binds to. The ACPI device has instead
a "physical_node" link pointing back to the PNP device. Other firmware
frameworks, like OpenFirmware, could do the same thing to couple their
firmware tables to the rest of the system.
(Based on a patch from Zhang Rui. This version is modified to not
depend on the patch makig ACPI initialize driver model wakeup flags.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
David Brownell
1071695f17