Serial UART 16450/16550 MIDI driver			===================================The adaptor module parameter allows you to select either:  0 - Roland Soundcanvas support (default)  1 - Midiator MS-124T support (1)  2 - Midiator MS-124W S/A mode (2)  3 - MS-124W M/B mode support (3)  4 - Generic device with multiple input support (4)For the Midiator MS-124W, you must set the physical M-S and A-Bswitches on the Midiator to match the driver mode you select.In Roland Soundcanvas mode, multiple ALSA raw MIDI substreams are supported(midiCnD0-midiCnD15).  Whenever you write to a different substream, the driversends the nonstandard MIDI command sequence F5 NN, where NN is the substreamnumber plus 1.  Roland modules use this command to switch between different"parts", so this feature lets you treat each part as a distinct raw MIDIsubstream. The driver provides no way to send F5 00 (no selection) or to notsend the F5 NN command sequence at all; perhaps it ought to.Usage example for simple serial converter:	/sbin/setserial /dev/ttyS0 none	/sbin/modprobe snd-serial-u16550 port=0x3f8 irq=4 speed=115200Usage example for Roland SoundCanvas with 4 MIDI ports:	/sbin/setserial /dev/ttyS0 none	/sbin/modprobe snd-serial-u16550 port=0x3f8 irq=4 outs=4In MS-124T mode, one raw MIDI substream is supported (midiCnD0); the outsmodule parameter is automatically set to 1. The driver sends the same data toall four MIDI Out connectors.  Set the A-B switch and the speed moduleparameter to match (A=19200, B=9600).Usage example for MS-124T, with A-B switch in A position:	/sbin/setserial /dev/ttyS0 none	/sbin/modprobe snd-serial-u16550 port=0x3f8 irq=4 adaptor=1 \			speed=19200In MS-124W S/A mode, one raw MIDI substream is supported (midiCnD0);the outs module parameter is automatically set to 1. The driver sendsthe same data to all four MIDI Out connectors at full MIDI speed.Usage example for S/A mode:	/sbin/setserial /dev/ttyS0 none	/sbin/modprobe snd-serial-u16550 port=0x3f8 irq=4 adaptor=2In MS-124W M/B mode, the driver supports 16 ALSA raw MIDI substreams;the outs module parameter is automatically set to 16.  The substreamnumber gives a bitmask of which MIDI Out connectors the data should besent to, with midiCnD1 sending to Out 1, midiCnD2 to Out 2, midiCnD4 toOut 3, and midiCnD8 to Out 4.  Thus midiCnD15 sends the data to all 4 ports.As a special case, midiCnD0 also sends to all ports, since it is not usefulto send the data to no ports.  M/B mode has extra overhead to select the MIDIOut for each byte, so the aggregate data rate across all four MIDI Outs isat most one byte every 520 us, as compared with the full MIDI data rate ofone byte every 320 us per port.Usage example for M/B mode:	/sbin/setserial /dev/ttyS0 none	/sbin/modprobe snd-serial-u16550 port=0x3f8 irq=4 adaptor=3The MS-124W hardware's M/A mode is currently not supported. This mode allowsthe MIDI Outs to act independently at double the aggregate throughput of M/B,but does not allow sending the same byte simultaneously to multiple MIDI Outs. The M/A protocol requires the driver to twiddle the modem control lines undertiming constraints, so it would be a bit more complicated to implement thanthe other modes.Midiator models other than MS-124W and MS-124T are currently not supported. Note that the suffix letter is significant; the MS-124 and MS-124B are notcompatible, nor are the other known models MS-101, MS-101B, MS-103, and MS-114.I do have documentation (tim.mann@compaq.com) that partially covers these models,but no units to experiment with.  The MS-124W support is tested with a real unit.The MS-124T support is untested, but should work.The Generic driver supports multiple input and output substreams over a singleserial port.  Similar to Roland Soundcanvas mode, F5 NN is used to select theappropriate input or output stream (depending on the data direction).Additionally, the CTS signal is used to regulate the data flow.  The number ofinputs is specified by the ins parameter.