Hello alsa-dev,
I'd like to get the Tascam US-122L support under ALSA which is a USB 2.0
device.
I've been discussing with Martin Langer who developed the firmware for
the US-122. He's
looked at the usbsnoop logs and lsusb output for me and thinks that the
US-122L uses a different
chip compared to the old usx2y boxes and that firmware is not loaded at
connection. Possibly the device
fits better into the USB audio specification (snd-usb-audio driver) and
may only need
an entry into usbquirks.h (and possibly usbaudio.c & usbaudio.h maybe ??)
As I'm very inexperienced I would really appreciate help in adding a
US-122L entry into the
usbquirks.h file to test. I can provide the usbsnoop logs if needed but
for now here is the output of lsusb -vv:
Bus 002 Device 002: ID 0644:800e TEAC Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0644 TEAC Corp.
idProduct 0x800e
bcdDevice 1.00
iManufacturer 1 TASCAM
iProduct 2 US-122L
iSerial 3 no serial number
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 72
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 480mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0126 1x 294 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0126 1x 294 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0009 1x 9 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0010 1x 16 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
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