On Mon, Feb 06, 2012 at 11:25:20AM +0800, Daniel Toussaint wrote: > I am working on an Intel (ICH8) based system. A custom device on the system > emits interrupts to a GPI on the ICH8 chip. Currently, as a test, I have > from userspace configured the GPI we use to send a SCI. This seems to work, > because I get a "IRQ9 , nobody cared" message from the kernel. > My questions now are : > How do I go about and create an ACPI based driver to catch this event ? Or am > I searching in the wrong direction. > If I am right, and the driver has to go through ACPI, are changes to the > ACPI tables in BIOS required ? The ACPI tables should declare the device and its resources, along with a unique _HID() to allow the driver to bind to it. There should also be a _Lxx or_Exx (depending on whether it's level or edge triggered) method for the appropriate GPE (which is the GPIO number + 0x10 on ICH8, I believe) which sends a Notify to the ACPI device. It's then trivial to write a small Linux acpi driver which will get the notifications. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
