On Friday, January 13, 2012 12:16:51 Andy Walls wrote:
> Hans Verkuil <hverk...@xs4all.nl> wrote:
>
> >Hi!
> >
> >I've made a video4linux driver for the USB Keene FM Transmitter. See:
> >
> >http://www.amazon.co.uk/Keene-Electronics-USB-FM-Transmitter/dp/B003GCHPDY/ref=sr_1_1?ie=UTF8&qid=1326450476&sr=8-1
> >
> >The driver code is here:
> >
> >http://git.linuxtv.org/hverkuil/media_tree.git/shortlog/refs/heads/keene
> >
> >Unfortunately this device has exactly the same USB ID as the Logitech
> >AudioHub
> >USB speaker (http://www.logitech.com/en-us/439/3503).
> >
> >The AudioHub has HID support for volume keys, but the FM transmitter
> >needs
> >a custom V4L2 driver instead.
> >
> >I've attached the full lsusb -v output of both devices, but this is the
> >diff of
> >the two:
> >
> >$ diff keene.txt audiohub.txt -u
> >--- keene.txt 2012-01-13 11:10:48.265399953 +0100
> >+++ audiohub.txt 2012-01-13 11:09:45.185398935 +0100
> >@@ -1,5 +1,5 @@
> >
> >-Bus 007 Device 009: ID 046d:0a0e Logitech, Inc.
> >+Bus 003 Device 004: ID 046d:0a0e Logitech, Inc.
> > Device Descriptor:
> > bLength 18
> > bDescriptorType 1
> >@@ -12,7 +12,7 @@
> > idProduct 0x0a0e
> > bcdDevice 1.00
> > iManufacturer 1 HOLTEK
> >- iProduct 2 B-LINK USB Audio
> >+ iProduct 2 AudioHub Speaker
> > iSerial 0
> > bNumConfigurations 1
> > Configuration Descriptor:
> >@@ -22,9 +22,8 @@
> > bNumInterfaces 3
> > bConfigurationValue 1
> > iConfiguration 0
> >- bmAttributes 0xa0
> >+ bmAttributes 0x80
> > (Bus Powered)
> >- Remote Wakeup
> > MaxPower 500mA
> > Interface Descriptor:
> > bLength 9
> >@@ -152,7 +151,7 @@
> > bCountryCode 0 Not supported
> > bNumDescriptors 1
> > bDescriptorType 34 Report
> >- wDescriptorLength 22
> >+ wDescriptorLength 31
> > Report Descriptors:
> > ** UNAVAILABLE **
> > Endpoint Descriptor:
> >
> >As you can see, the differences are very small.
> >
> >In my git tree I worked around it by adding the USB ID to the ignore
> >list
> >if the Keene driver is enabled, and ensuring that the Keene driver is
> >disabled by default.
> >
> >But is there a better method to do this? At least the iProduct strings
> >are
> >different, is that something that can be tested in hid-core.c?
> >
> >Regards,
> >
> > Hans
>
> Maybe it doesn't matter, but what do the Report Descriptors look like?
>
> http://www.slashdev.ca/2010/05/08/get-usb-report-descriptor-with-linux/
Attached the new lsusb outputs, this time with the report descriptor.
Note that if I plug in the Keene transmitter, then no input device is
created:
Jan 13 14:25:12 tschai kernel: [ 1686.020166] usb 7-4: new full-speed USB
device number 3 using ohci_hcd
Jan 13 14:25:12 tschai kernel: [ 1686.248735] generic-usb 0003:046D:0A0E.0009:
hiddev0,hidraw4: USB HID v1.10 Device [HOLTEK B-LINK USB Audio ] on
usb-0000:00:16.0-4/input2
Compare that to what happens when the audiohub is plugged in:
Jan 13 14:25:49 tschai kernel: [ 1722.820125] usb 3-4: new high-speed USB
device number 6 using ehci_hcd
Jan 13 14:25:49 tschai kernel: [ 1722.973529] hub 3-4:1.0: USB hub found
Jan 13 14:25:49 tschai kernel: [ 1722.973960] hub 3-4:1.0: 4 ports detected
Jan 13 14:25:49 tschai kernel: [ 1723.250629] usb 3-4.4: new full-speed USB
device number 7 using ehci_hcd
Jan 13 14:25:49 tschai kernel: [ 1723.390888] input: HOLTEK AudioHub Speaker
as /devices/pci0000:00/0000:00:16.2/usb3/3-4/3-4.4/3-4.4:1.2/input/input12
Jan 13 14:25:49 tschai kernel: [ 1723.391176] generic-usb 0003:046D:0A0E.000A:
input,hidraw4: USB HID v1.10 Device [HOLTEK AudioHub Speaker] on
usb-0000:00:16.2-4.4/input2
I'm no expert on usb and HID, so I hope someone can point me to a better
solution.
Regards,
Hans
Bus 003 Device 004: ID 046d:0a0e Logitech, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x046d Logitech, Inc.
idProduct 0x0a0e
bcdDevice 1.00
iManufacturer 1 HOLTEK
iProduct 2 AudioHub Speaker
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 135
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
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 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 40
bInCollection 1
baInterfaceNr( 0) 1
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 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 13
bSourceID 1
bControlSize 1
bmaControls( 0) 0x03
Mute Control
Volume Control
bmaControls( 1) 0x00
bmaControls( 2) 0x00
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 13
iTerminal 0
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 1 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 1 Discrete
tSamFreq[ 0] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 0 Undefined
wLockDelay 0 Undefined
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 31
Report Descriptor: (length is 31)
Item(Global): Usage Page, data= [ 0x0c ] 12
Consumer
Item(Local ): Usage, data= [ 0x01 ] 1
Consumer Control
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Local ): Usage, data= [ 0xe9 ] 233
Volume Increment
Item(Local ): Usage, data= [ 0xea ] 234
Volume Decrement
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Input, data= [ 0x2a ] 42
Data Variable Absolute Wrap Linear
No_Preferred_State No_Null_Position Non_Volatile
Bitfield
Item(Local ): Usage, data= [ 0xe2 ] 226
Mute
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Main ): Input, data= [ 0x2e ] 46
Data Variable Relative Wrap Linear
No_Preferred_State No_Null_Position Non_Volatile
Bitfield
Item(Global): Report Count, data= [ 0x05 ] 5
Item(Main ): Input, data= [ 0x01 ] 1
Constant Array Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile
Bitfield
Item(Main ): End Collection, data=none
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 48
Device Status: 0x0000
(Bus Powered)
Bus 007 Device 002: ID 046d:0a0e Logitech, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x046d Logitech, Inc.
idProduct 0x0a0e
bcdDevice 1.00
iManufacturer 1 HOLTEK
iProduct 2 B-LINK USB Audio
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 135
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 500mA
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 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 40
bInCollection 1
baInterfaceNr( 0) 1
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 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 13
bSourceID 1
bControlSize 1
bmaControls( 0) 0x03
Mute Control
Volume Control
bmaControls( 1) 0x00
bmaControls( 2) 0x00
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 13
iTerminal 0
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 1 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 1 Discrete
tSamFreq[ 0] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bLockDelayUnits 0 Undefined
wLockDelay 0 Undefined
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 22
Report Descriptor: (length is 22)
Item(Global): Usage Page, data= [ 0x00 0xff ] 65280
(null)
Item(Local ): Usage, data= [ 0x01 ] 1
(null)
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0xff ] 255
Item(Local ): Usage Minimum, data= [ 0x00 ] 0
(null)
Item(Local ): Usage Maximum, data= [ 0x01 ] 1
(null)
Item(Global): Report Count, data= [ 0x08 ] 8
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Main ): Output, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile
Bitfield
Item(Main ): End Collection, data=none
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 48
Device Status: 0x0000
(Bus Powered)
