Serial port MIDI devices - Opcode Studio 64X

["Bill Adair" <adair@gotadsl.co.uk>]

I'm about to have a look at developing an ALSA serial port driver
for the Opcode Studio 64X. Does anyone else have an interest in this
device, or similar hardware?

The Roland Sound Canvas and Midiator devices seem to be similar to the
specification I have. There are four stages Detection, Sign-On,  
MIDI-Transfer
and Sign-Off. The interface toggles the CTS and the PC responds on RTS  
during
detection and then the two lines are used during MIDI-Transfer to prevent  
buffer
overflow.

Where would be the best place to add this code? I'm a little confused by  
the
way all the functionality is laid out. The following is a list of routines  
 from the
serial-u16650.c file. Is there a guide anywhere that says which routines  
are called by
ALSA to "do" operations i.e. if I want to detect my hardware I need check  
a port
for response. Which routine should this be done in? Is this triggered by  
loading a driver?
etc.

snd_uart16550_add_timer()
snd_uart16550_del_timer()
snd_uart16550_buffer_output()
snd_uart16550_io_loop()
snd_uart16550_interrupt()
snd_uart16550_buffer_timer()
snd_uart16550_detect()
snd_uart16550_do_open()
snd_uart16550_do_close()
snd_uart16550_input_open()
snd_uart16550_input_close()
snd_uart16550_input_trigger()
snd_uart16550_output_open()
snd_uart16550_output_close()
snd_uart16550_buffer_can_write()
snd_uart16550_write_buffer()
snd_uart16550_output_byte()
snd_uart16550_output_write()
snd_uart16550_output_trigger()
snd_rawmidi_ops_t snd_uart16550_output =
snd_rawmidi_ops_t snd_uart16550_input =
snd_uart16550_free()
snd_uart16550_dev_free()
snd_uart16550_create()
snd_uart16550_rmidi()
snd_serial_probe()
alsa_card_serial_init()
alsa_card_serial_exit()
module_init()
module_exit()

Bill


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