Re: Number of subdevices on midi.

[Peter Enderborg <pme@ufh.se>]

Jaroslav Kysela wrote:

> On Wed, 3 Apr 2002, Peter Enderborg wrote:
>
> > I have tryed to get some answer from Jaroslav about subdevices on midi.
> > Im trying to write a driver for midisport 8x8/s and that have 9 midi
> > ports. On my hack to figure out the protocol I use virmidi to handle the
> > interface to alsa. But virmidi only have four subdevices per device. I
>
> You can set up to eight virmidi devices (snd_midi_devs parameter controls
> this count). On rawmidi side, there is 16 rawmidi substreams (subdevices)
> per one virmidi device. These subdevices are used for event merging
> (write) and coping (read). On sequencer side, there is one client and
> one port connected to virmidi device.
>
> > need to see the driver for a midi interface that using all the 16
> > subdevices. Since I don't get answer from Jaroslav i guess he don't have
> > the time or my question is stupid. But can someone help me out? Where
> > should I look?
>
> There are two ways:
>
> 1) we can add a new mode to virmidi code which suppress copying and
>    merging and connects more sequencer ports per a sequencer client
>    to rawmidi subdevices to handle such devices
> 2) without any change - simply use more than one virmidi card and connect
>    your code to more clients:
>

That is what I do now. But it is not pretty. My plan is to do a real driver
not a virmidi user.


>
>         modprobe snd-virmidi snd_index=1,2 snd_enable=1,1 snd_midi_devs=8,8
>
>         (use index values as you wish)
>

Have you done that? This is what I get.

[root@pescadero pme]# /sbin/modprobe snd-virmidi snd_enable=1,1
snd_midi_devs=8,8
/lib/modules/2.4.16/misc/snd-virmidi.o: init_module: No such device
Hint: insmod errors can be caused by incorrect module parameters, including
invalid IO or IRQ parameters
/lib/modules/2.4.16/misc/snd-virmidi.o: insmod
/lib/modules/2.4.16/misc/snd-virmidi.o failed
/lib/modules/2.4.16/misc/snd-virmidi.o: insmod snd-virmidi failed


[root@pescadero pme]# /sbin/modprobe snd-virmidi snd_enable=1,1
snd_midi_devs=8
/lib/modules/2.4.16/misc/snd-virmidi.o: init_module: No such device
Hint: insmod errors can be caused by incorrect module parameters, including
invalid IO or IRQ parameters
/lib/modules/2.4.16/misc/snd-virmidi.o: insmod
/lib/modules/2.4.16/misc/snd-virmidi.o failed
/lib/modules/2.4.16/misc/snd-virmidi.o: insmod snd-virmidi failed


[root@pescadero pme]# /sbin/modprobe snd-virmidi snd_enable=1,1
snd_midi_devs=4,4
[root@pescadero pme]#

I also get the same with 5.

>
>         In this case, you should have available this routing table:
>
>         sequencer (client:port)         rawmidi (card:device:subdevice)
>         72:0                            1:0:any
>         73:0                            1:1:any
>         ....                            ....
>         79:0                            1:7:any
>         80:0                            2:0:any
>         ....                            ...
>         87:0                            2:7:any
>
>                                                 Jaroslav
>
> -----
> Jaroslav Kysela <perex@suse.cz>
> Linux Kernel Sound Maintainer
> ALSA Project  http://www.alsa-project.org
> SuSE Linux    http://www.suse.com
>
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> Alsa-devel mailing list
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