Add trivial driver to disable Intel Smart Connect

Intel Smart Connect is an Intel-specific ACPI interface for configuring
devices to wake up at regular intervals so they can pull down mail or other
internet updates, and then go to sleep again. If a user enables this in
Windows and then reboots into Linux, the device may wake up if it's put to
sleep. Since there's no Linux userland support for any of this, the machine
will then remain awake until something else puts it back to sleep.

I haven't figured out all that much about how this works (there's a bunch
of different ACPI calls available on the device), but this seems to be
enough to turn it off. We can add more features to this driver if anyone
ever cares about figuring out what the rest of the calls do or writing some
Linux userspace to implement the rest of it.

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 36057f481162..a3d76c59a394 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -794,6 +794,20 @@ config INTEL_RST
           firmware will copy the memory contents back to RAM and resume the OS
           as usual.
 
+config INTEL_SMARTCONNECT
+        tristate "Intel Smart Connect disabling driver"
+        depends on ACPI
+        ---help---
+          Intel Smart Connect is a technology intended to permit devices to
+          update state by resuming for a short period of time at regular
+          intervals. If a user enables this functionality under Windows and
+          then reboots into Linux, the system may remain configured to resume
+          on suspend. In the absence of any userspace to support it, the system
+          will then remain awake until something triggers another suspend.
+
+          This driver checks to determine whether the device has Intel Smart
+          Connect enabled, and if so disables it.
+
 config PVPANIC
         tristate "pvpanic device support"
         depends on ACPI