Regression in Final Scratch 'ScratchAmp' quirk (DJ interface)
3 Jan
2024
3 Jan
'24
4:54 p.m.
The ScratchAmp worked perfectly with a quirk, but now that seems to have regressed and the device is no longer detected [1].
It's design is from 2002, based on class-compliant (Philips UDA1325H) chips. It hides itself behind a 'vendor specific' description, presumably as it was launched in a closed system with specific hardware and software for DJ'ing.
So this quirk was introduced in 2007:
+/* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */ +{ + USB_DEVICE(0x103d, 0x0100), + .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) { + .vendor_name = "Stanton", + .product_name = "ScratchAmp", + .ifnum = QUIRK_NO_INTERFACE + } +}, +{ + USB_DEVICE(0x103d, 0x0101), + .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) { + .vendor_name = "Stanton", + .product_name = "ScratchAmp", + .ifnum = QUIRK_NO_INTERFACE + } +},
In a modern kernel, the (ineffective) quirk is now in sound/usb/card.c:
+ /* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */ + DEVICE_NAME(0x103d, 0x0100, "Stanton", "ScratchAmp"), + DEVICE_NAME(0x103d, 0x0101, "Stanton", "ScratchAmp"),
Is there a functional difference between these quirks and/or any reason the device would no longer be detected?
I noted the commits went via use of QUIRK_RENAME_DEVICE(), perhaps misleading the refactoring to assume the quirk was purely a rename.
Below is an "lsusb" of the device, dated from 2008; I don't currently have access to my own device, or know exactly when this regressed.
Many thanks
[1] https://sourceforge.net/p/xwax/mailman/message/48496984/ [2] http://www.pogo.org.uk/~mark/linuxdj/scratchamp.html [3] https://finalscratch.sourceforge.net/innards/
--
Mark
Bus 3 Device 4: ID 103d:0100
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 255
bMaxPacketSize0 8
idVendor 0x103d
idProduct 0x0100
bcdDevice 1.01
iManufacturer 1 Stanton Magnetics/ Songo/ N2IT
iProduct 2 ScratchAmp
iSerial 3 00000001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 833
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 74
bInCollection 2
baInterfaceNr( 0) 1
baInterfaceNr( 1) 2
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 4 Turntable 1
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 2
bSourceID 1
bControlSize 2
bmaControls( 0) 0x00
bmaControls( 0) 0x00
bmaControls( 1) 0x02
bmaControls( 1) 0x00
Volume
bmaControls( 2) 0x02
bmaControls( 2) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0304 Desktop Speaker
bAssocTerminal 0
bSourceID 2
iTerminal 4 Turntable 1
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 4
wTerminalType 0x0708 Phonograph
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 4 Turntable 1
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 7
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 4
iTerminal 4 Turntable 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 1
bBitResolution 8
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x0038 1x 56 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 1
bBitResolution 8
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x0070 1x 112 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 3
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 2
bBitResolution 16
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x0070 1x 112 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 4
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x00e0 1x 224 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 5
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 3
bBitResolution 20
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x00a8 1x 168 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 6
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 3
bBitResolution 20
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x0150 1x 336 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 7
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 44
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 1
bBitResolution 8
bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
tSamFreq[ 3] 8000
tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
tSamFreq[ 7] 22050
tSamFreq[ 8] 24000
tSamFreq[ 9] 32000
tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0038 1x 56 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 7
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 44
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 1
bBitResolution 8
bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
tSamFreq[ 3] 8000
tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
tSamFreq[ 7] 22050
tSamFreq[ 8] 24000
tSamFreq[ 9] 32000
tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0070 1x 112 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 3
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 7
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 44
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 2
bBitResolution 16
bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
tSamFreq[ 3] 8000
tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
tSamFreq[ 7] 22050
tSamFreq[ 8] 24000
tSamFreq[ 9] 32000
tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0070 1x 112 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 4
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 7
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 44
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
tSamFreq[ 3] 8000
tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
tSamFreq[ 7] 22050
tSamFreq[ 8] 24000
tSamFreq[ 9] 32000
tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x00e0 1x 224 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 5
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 7
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 44
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 3
bBitResolution 20
bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
tSamFreq[ 3] 8000
tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
tSamFreq[ 7] 22050
tSamFreq[ 8] 24000
tSamFreq[ 9] 32000
tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x00a8 1x 168 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 6
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 7
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 44
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 3
bBitResolution 20
bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
tSamFreq[ 3] 8000
tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
tSamFreq[ 7] 22050
tSamFreq[ 8] 24000
tSamFreq[ 9] 32000
tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0150 1x 336 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Device Status: 0x0000
(Bus Powered)
Bus 3 Device 3: ID 103d:0101
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 255
bMaxPacketSize0 8
idVendor 0x103d
idProduct 0x0101
bcdDevice 1.00
iManufacturer 1 Stanton Magnetics/ Songo/ N2IT
iProduct 2 ScratchAmp
iSerial 3 00000001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 833
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 74
bInCollection 2
baInterfaceNr( 0) 1
baInterfaceNr( 1) 2
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 4 Turntable 2
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 2
bSourceID 1
bControlSize 2
bmaControls( 0) 0x00
bmaControls( 0) 0x00
bmaControls( 1) 0x02
bmaControls( 1) 0x00
Volume
bmaControls( 2) 0x02
bmaControls( 2) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0304 Desktop Speaker
bAssocTerminal 0
bSourceID 2
iTerminal 4 Turntable 2
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 4
wTerminalType 0x0708 Phonograph
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 4 Turntable 2
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 7
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 4
iTerminal 4 Turntable 2
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 1
bBitResolution 8
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x0038 1x 56 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 1
bBitResolution 8
bSamFreqType 0 Continuous
tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x0070 1x 112 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
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bInterfaceClass 1 Audio
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bDescriptorSubtype 2 (FORMAT_TYPE)
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bInterval 1
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bSynchAddress 0
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bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
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bDescriptorType 4
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bAlternateSetting 4
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bInterfaceClass 1 Audio
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AudioStreaming Interface Descriptor:
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bDescriptorType 36
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AudioStreaming Interface Descriptor:
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bDescriptorSubtype 1 (EP_GENERAL)
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wLockDelay 512 Decoded PCM samples
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bInterfaceClass 1 Audio
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bDescriptorType 36
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AudioStreaming Interface Descriptor:
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bDescriptorSubtype 2 (FORMAT_TYPE)
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tUpperSamFreq 55010
Endpoint Descriptor:
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bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
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bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
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AudioStreaming Interface Descriptor:
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bDescriptorType 36
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AudioStreaming Interface Descriptor:
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bDescriptorSubtype 2 (FORMAT_TYPE)
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tLowerSamFreq 4990
tUpperSamFreq 55010
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 9
Transfer Type Isochronous
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bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
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bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
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bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
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iInterface 0
Interface Descriptor:
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bInterfaceClass 1 Audio
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iInterface 0
AudioStreaming Interface Descriptor:
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bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 7
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 44
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
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bBitResolution 8
bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
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tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
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tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
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AudioControl Endpoint Descriptor:
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bDescriptorType 37
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bmAttributes 0x01
Sampling Frequency
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wLockDelay 0 Decoded PCM samples
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bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
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bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
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tSamFreq[ 4] 11025
tSamFreq[ 5] 12000
tSamFreq[ 6] 16000
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tSamFreq[ 9] 32000
tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
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AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
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wLockDelay 0 Decoded PCM samples
Interface Descriptor:
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bDescriptorType 4
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bInterfaceClass 1 Audio
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bInterfaceProtocol 0
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bDescriptorType 36
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bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
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bSubframeSize 2
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bSamFreqType 12 Discrete
tSamFreq[ 0] 4000
tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
tSamFreq[ 3] 8000
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tSamFreq[ 5] 12000
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tSamFreq[ 9] 32000
tSamFreq[10] 44100
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bDescriptorSubtype 2 (FORMAT_TYPE)
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bSamFreqType 12 Discrete
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tSamFreq[ 2] 6000
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tSamFreq[ 7] 22050
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tSamFreq[10] 44100
tSamFreq[11] 48000
Endpoint Descriptor:
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bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
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bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
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bInterval 1
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wLockDelay 0 Decoded PCM samples
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bDescriptorType 36
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bTerminalLink 7
bDelay 0 frames
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bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
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bBitResolution 20
bSamFreqType 12 Discrete
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tSamFreq[ 1] 5512
tSamFreq[ 2] 6000
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 5
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wMaxPacketSize 0x0150 1x 336 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
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bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Device Status: 0x0000
(Bus Powered)
4 Jan
4 Jan
12:53 a.m.
On Wed, Jan 03, 2024 at 03:54:29PM +0000, Mark Hills wrote:
The ScratchAmp worked perfectly with a quirk, but now that seems to have regressed and the device is no longer detected [1].
It's design is from 2002, based on class-compliant (Philips UDA1325H) chips. It hides itself behind a 'vendor specific' description, presumably as it was launched in a closed system with specific hardware and software for DJ'ing.
Hi Mark, great fan of your work with xwax here.
Perhaps adding USB_DEVICE_VENDOR_SPEC(0x103d, 0x0100) and USB_DEVICE_VENDOR_SPEC(0x103d, 0x0101) to quirks-table.h can do the trick?
Regards, Geraldo Nascimento
So this quirk was introduced in 2007:
+/* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */ +{
- USB_DEVICE(0x103d, 0x0100),
.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {.vendor_name = "Stanton",.product_name = "ScratchAmp",.ifnum = QUIRK_NO_INTERFACE- }
+}, +{
- USB_DEVICE(0x103d, 0x0101),
.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {.vendor_name = "Stanton",.product_name = "ScratchAmp",.ifnum = QUIRK_NO_INTERFACE- }
+},
In a modern kernel, the (ineffective) quirk is now in sound/usb/card.c:
- /* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */
- DEVICE_NAME(0x103d, 0x0100, "Stanton", "ScratchAmp"),
- DEVICE_NAME(0x103d, 0x0101, "Stanton", "ScratchAmp"),
Is there a functional difference between these quirks and/or any reason the device would no longer be detected?
I noted the commits went via use of QUIRK_RENAME_DEVICE(), perhaps misleading the refactoring to assume the quirk was purely a rename.
Below is an "lsusb" of the device, dated from 2008; I don't currently have access to my own device, or know exactly when this regressed.
Many thanks
[1] https://sourceforge.net/p/xwax/mailman/message/48496984/ [2] http://www.pogo.org.uk/~mark/linuxdj/scratchamp.html [3] https://finalscratch.sourceforge.net/innards/
-- Mark
10:42 a.m.
On Thu, 04 Jan 2024 00:53:40 +0100, Geraldo Nascimento wrote:
On Wed, Jan 03, 2024 at 03:54:29PM +0000, Mark Hills wrote:
The ScratchAmp worked perfectly with a quirk, but now that seems to have regressed and the device is no longer detected [1].
It's design is from 2002, based on class-compliant (Philips UDA1325H) chips. It hides itself behind a 'vendor specific' description, presumably as it was launched in a closed system with specific hardware and software for DJ'ing.
Hi Mark, great fan of your work with xwax here.
Perhaps adding USB_DEVICE_VENDOR_SPEC(0x103d, 0x0100) and USB_DEVICE_VENDOR_SPEC(0x103d, 0x0101) to quirks-table.h can do the trick?
Yes, something like below.
If this doesn't work, try to replace USB_DEVICE_VENDOR_SPEC() with USB_AUDIO_DEVICE() in the patch.
In anyway, please give lsusb -v output of the specific device, too.
Takashi
-- 8< -- --- a/sound/usb/quirks-table.h +++ b/sound/usb/quirks-table.h @@ -169,6 +169,10 @@ { USB_AUDIO_DEVICE(0x046d, 0x08f6) }, { USB_AUDIO_DEVICE(0x046d, 0x0990) },
+/* Stanton ScratchAmp */ +{ USB_DEVICE_VENDOR_SPEC(0x103d, 0x0100) }, +{ USB_DEVICE_VENDOR_SPEC(0x103d, 0x0101) }, + /* * Yamaha devices */
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2 comments
3 participants
participants (3)
-
Geraldo Nascimento -
Mark Hills -
Takashi Iwai