staging: comedi: adl_pci9118: support auto-attachment
Support auto-attachment of supported PCI devices by adding the `auto_attach()` hook (`pci9118_auto_attach()`) to the `struct comedi_driver`. This is called via `comedi_pci_auto_attach()` at PCI probe time. Previously, the driver's call to `comedi_pci_auto_config()` would fall back to the old method of auto-attaching devices and would fail because it couldn't find a board name matching the driver name. The new method doesn't care about that. There are still a few problems. All the boards supported by this driver have the same PCI vendor and device ID, so it will just pick the first supported board type, "pci9118dg". (Other supported board types have different AI ranges or different AI speeds, but are otherwise the same.) Also, manual attachment of devices allows several optional features to be configured, such as use of an external multiplexord, specified sample&hold delays and options to ignore certain hardware errors. These will all be set to defaults for auto-attached devices. A future version of the driver may address these issues via configurable device attributes. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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