Re: [PATCH] -- fix Boss MS-3 midi-usb communication

[Takashi Iwai <tiwai@suse.de>]

On Fri, 11 Aug 2023 09:21:44 +0200,
john_candlish@mail.candlish.net wrote:
> 
> This one line change gets MIDI communication flowing between ALSA and the Boss MS-3 multi-effect switcher.
> 
> /////
> *** sound/usb/midi.c    2023-08-10 22:46:31.016346930 +0200
> --- sound/usb/midi.c-orig   2023-07-19 16:37:03.000000000 +0200
> ***************
> *** 2106,2113 ****
>     struct usb_endpoint_descriptor *epd;
>     int i, out_eps = 0, in_eps = 0;
> 
> !   if (USB_ID_VENDOR(umidi->usb_id) == 0x0582 &&
> !       USB_ID_PRODUCT(umidi->usb_id) != 0x01f5)
>         snd_usbmidi_switch_roland_altsetting(umidi);
> 
> if (endpoint[0].out_ep || endpoint[0].in_ep)
> --- 2106,2112 ----
>     struct usb_endpoint_descriptor *epd;
>     int i, out_eps = 0, in_eps = 0;
> 
> !   if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
>         snd_usbmidi_switch_roland_altsetting(umidi);
> 
> if (endpoint[0].out_ep || endpoint[0].in_ep)
> 
> /////
> 
> There are doubtless other Roland/Boss USB_ID_PRODUCT id's that are effected and it would be nice to make the  USB_ID_PRODUCT value a tunable, but that is beyond my competence.

Could you give the exact USB vendor/product IDs so that I can cook a
patch?  At best, please give alsa-info.sh output; run the script with
--no-upload option and attach the output.


thanks,

Takashi