On Thu, 2 Aug 2007, Mike Frysinger wrote:
> i have a pair of old Altec Lansing speakers that have a USB cable which
> allows
> you to control the Functional Unit (volume/mute/bass/etc...). i'm trying to
> add it to usbquirks.h but cant seem to invoke the necessary voodoo.
> /*
> * Altec Lansing: Feature Unit for speakers
> */
> {
> .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
> USB_DEVICE_ID_MATCH_INT_CLASS |
> USB_DEVICE_ID_MATCH_INT_SUBCLASS,
> .idVendor = 0x04d2,
> .idProduct = 0xff05,
> .bInterfaceClass = USB_CLASS_AUDIO,
> .bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL
> },
>
> but upon loading the freshly compiled module, i'm informed:
> unknown device speed 1
>
> the usbaudio code doesnt seem to accept USB_SPEED_LOW ?
Nope. I rather suspect that it also doesn't accept devices with no
audio output channel.
> and here's the `lsusb -v` output:
> Bus 002 Device 010: ID 04d2:ff05 Altec Lansing Technologies ADA-305 Speakers
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 1.00
> bDeviceClass 255 Vendor Specific Class
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 8
> idVendor 0x04d2 Altec Lansing Technologies
> idProduct 0xff05 ADA-305 Speakers
> bcdDevice 0.00
> iManufacturer 1 ALTEC LANSING Multimedia
> iProduct 2 ASC495 Speakers
> iSerial 0
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 25
> bNumInterfaces 1
> bConfigurationValue 1
> iConfiguration 0
> bmAttributes 0x40
> (Missing must-be-set bit!)
> Self Powered
> MaxPower 0mA
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 1
> bInterfaceClass 1 Audio
> bInterfaceSubClass 1 Control Device
> bInterfaceProtocol 0
> iInterface 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x81 EP 1 IN
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0002 1x 2 bytes
> bInterval 32
> Device Status: 0x0001
> Self Powered
Notice that the only endpoint is for input. There's no way to send
audio data to the speakers. Is it possible that this is supposed to be
an HID control?
Alan Stern
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