diff options
author | Daniel Mack <daniel@caiaq.de> | 2011-02-11 11:08:06 +0000 |
---|---|---|
committer | Takashi Iwai <tiwai@suse.de> | 2011-02-14 17:10:57 +0100 |
commit | 54a8c500d5b80c83e0f14cbcfcfd4a84abff8a80 (patch) | |
tree | 2292d77a630dec193a5682e6238d73b7c09a8cd9 /sound/usb/quirks.c | |
parent | df8d81a32fa0309d64726fc62d83cb70adc899e8 (diff) |
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 <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/quirks.c')
-rw-r--r-- | sound/usb/quirks.c | 33 |
1 files changed, 33 insertions, 0 deletions
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 @@ -425,6 +425,34 @@ static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev) } /* + * 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 */ #define AUDIOPHILE_SET 0x01 /* if set, parse device_setup */ @@ -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; } |