[libhid-discuss] device with multiple interfaces

[Charles Lepple]

On May 16, 2007, at 8:37 AM, Arvid Picciani wrote:

>>  libhid-detach-device
> after that i get
> i have no idea how to interpret the output
[...]
>           Report Descriptor: (length is 142)
>             Item(Global): Usage Page, data= [ 0x01 ] 1
>                             Generic Desktop Controls
>             Item(Local ): Usage, data= [ 0x06 ] 6
>                             Keyboard

the keyboard part starts here

>             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): Report ID, data= [ 0x02 ] 2
>             Item(Local ): Usage Minimum, data= [ 0x00 ] 0
>                             Unassigned
>             Item(Local ): Usage Maximum, data= [ 0x3c 0x02 ] 572
>                             AC Format
>             Item(Global): Logical Minimum, data= [ 0x00 ] 0
>             Item(Global): Logical Maximum, data= [ 0x3c 0x02 ] 572
>             Item(Global): Report Size, data= [ 0x10 ] 16
>             Item(Global): Report Count, data= [ 0x01 ] 1
>             Item(Main  ): Input, data= [ 0x00 ] 0
>                             Data Array Absolute No_Wrap Linear
>                             Preferred_State No_Null_Position  
> Non_Volatile
> Bitfield
>             Item(Main  ): End Collection, data=none

Not sure what the above portion is, but maybe a remote control?

>             Item(Global): Usage Page, data= [ 0x01 ] 1
>                             Generic Desktop Controls
>             Item(Local ): Usage, data= [ 0x02 ] 2
>                             Mouse

mouse stuff starts here.

So it looks like keyboard and mouse plus maybe a remote control are  
on the first interface, and the rest of the functionality is on the  
second one.

-- 
Charles Lepple