From 54a8c500d5b80c83e0f14cbcfcfd4a84abff8a80 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Fri, 11 Feb 2011 11:08:06 +0000 Subject: ALSA: usb-audio: add support for Native Instruments MK2 devices The MK2 generation of Native Instruments' sound cards are in fact compliant to the USB audio standard of version 2 and other approved USB standards. However, they come up as vendor-specific device when first connected but can be told to come up with a new set of descriptors upon their next enumeration. The interfaces announced by the new descriptors will be handled by the kernel's class drivers. This is done by issuing a vendor specific device request and sending the device to reset. There are also some vendor-specific USB requests for some mixer elements that can't be exported in a standard compliant way. The driver now supports them with quirks handling mechanisms. Signed-off-by: Daniel Mack Signed-off-by: Takashi Iwai --- sound/usb/quirks.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'sound/usb/quirks.c') diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index cf8bf088394b..e55bd1cac77d 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -424,6 +424,34 @@ static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev) return 0; } +/* + * Some sound cards from Native Instruments are in fact compliant to the USB + * audio standard of version 2 and other approved USB standards, even though + * they come up as vendor-specific device when first connected. + * + * However, they can be told to come up with a new set of descriptors + * upon their next enumeration, and the interfaces announced by the new + * descriptors will then be handled by the kernel's class drivers. As the + * product ID will also change, no further checks are required. + */ + +static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev) +{ + int ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + 0xaf, USB_TYPE_VENDOR | USB_RECIP_DEVICE, + cpu_to_le16(1), 0, NULL, 0, 1000); + + if (ret < 0) + return ret; + + usb_reset_device(dev); + + /* return -EAGAIN, so the creation of an audio interface for this + * temporary device is aborted. The device will reconnect with a + * new product ID */ + return -EAGAIN; +} + /* * Setup quirks */ @@ -510,6 +538,11 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev, if (id == USB_ID(0x133e, 0x0815)) return snd_usb_accessmusic_boot_quirk(dev); + /* Native Instruments Devices */ + if (id == USB_ID(0x17cc, 0x1010) || /* Traktor Audio 6 */ + id == USB_ID(0x17cc, 0x1020)) /* Traktor Audio 10 */ + return snd_usb_nativeinstruments_boot_quirk(dev); + return 0; } -- cgit v1.2.3