Greetings, The PCI Express Mini Card (aka Mini PCIe) spec calls out pin 20 as W_DISABLE# to allow a PCIe host to disable the add-in card's radio operation and we have run this to a GPIO on our boards for some time. The M.2 specs also provide such signals. Is there any support in the Linux RFKILL subsystem to define this? Looking over the RFKILL subsystem I see support for wireless drivers to register with rfkill to support on/off/state hooks and support for gpio based rfkill 'input' switches but I haven't seen anything that deals with GPIO 'outputs' to add-in card slots. Perhaps support for this hasn't been deemed necessary because instead software controllable methods are always used to control rfkill states for the wireless devices on add-in cards? Best regards, Tim Tim Harvey - Principal Software Engineer Gateworks Corporation - http://www.gateworks.com/ 3026 S. Higuera St. San Luis Obispo CA 93401 805-781-2000
