linux-kernel - Re: [alsa-devel] [PATCH v2] ALSA: usb-audio: Add support for Akai MPC Element USB MIDI controller

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Date:	Thu, 08 Jan 2015 22:56:15 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Paul Bonser <misterpib@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>
CC:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH v2] ALSA: usb-audio: Add support for Akai
	MPC Element USB MIDI controller

Paul Bonser wrote:
> The Akai MPC Element incorrectly reports its bInterfaceClass as 255, but
> otherwise implements the USB MIDI spec correctly.
>
> This adds a quirks-table.h entry which allows the device to be
> recognized as a standard USB MIDI device.
>
> Signed-off-by: Paul Bonser <misterpib@...il.com>
> ---
> diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
> index 8590a32..e869b6c 100644
> --- a/sound/usb/quirks-table.h
> +++ b/sound/usb/quirks-table.h
> @@ -2516,6 +2516,28 @@ YAMAHA_DEVICE(0x7010, "UB99"),
>  	}
>  },
>
> +{
> +	/* Akai MPC Element */
> +	USB_DEVICE(0x09e8, 0x0021),
> +	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
> +		.ifnum = QUIRK_ANY_INTERFACE,
> +		.type = QUIRK_COMPOSITE,
> +		.data = & (const struct snd_usb_audio_quirk[]) {
> +			{
> +				.ifnum = 0,
> +				.type = QUIRK_IGNORE_INTERFACE
> +			},
> +			{
> +				.ifnum = 1,
> +				.type = QUIRK_MIDI_STANDARD_INTERFACE
> +			},
> +			{
> +				.ifnum = -1
> +			}
> +		}
> +	}
> +},

Why a composite quirk?  Does a single quirk entry not work?


Regards,
Clemens
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