Thanks for the pointer to usbsnoop solution - this appears to work! Ron
----- Original Message ----- From: "Charles Lepple" <[email protected]> To: [email protected] Cc: [email protected] Sent: Tuesday, August 25, 2009 6:26:04 PM GMT -06:00 US/Canada Central Subject: Re: [libhid-discuss] Timeout getting HID Descriptor On Aug 25, 2009, at 5:46 PM, [email protected] wrote: > Hello, > > I'm getting a timeout getting the HID Descriptor from a third party > device. Here is the lsusb -vvv output: > > Bus 005 Device 002: ID 0483:5057 SGS Thomson Microelectronics [...] > Report Descriptor: (length is 34) > Item(Global): Usage Page, data= [ 0xa0 0xff ] 65440 > (null) > Item(Local ): Usage, data= [ 0xa5 ] 165 > (null) > Item(Main ): Collection, data= [ 0x01 ] 1 > Application > Item(Local ): Usage, data= [ 0xa6 ] 166 > (null) > Item(Local ): Usage, data= [ 0xa7 ] 167 > (null) > Item(Global): Logical Minimum, data= [ 0x80 ] 128 > Item(Global): Logical Maximum, data= [ 0x7f ] 127 > Item(Global): Report Size, data= [ 0x08 ] 8 > Item(Global): Report Count, data= [ 0x3c ] 60 > Item(Main ): Input, data= [ 0x02 ] 2 > Data Variable Absolute No_Wrap Linear > Preferred_State No_Null_Position > Non_Volatile Bitfield > Item(Local ): Usage, data= [ 0xa9 ] 169 > (null) > Item(Global): Logical Minimum, data= [ 0x80 ] 128 > Item(Global): Logical Maximum, data= [ 0x7f ] 127 > Item(Global): Report Size, data= [ 0x08 ] 8 > Item(Global): Report Count, data= [ 0x3c ] 60 > 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 [...] > can't get debug descriptor: Connection timed out > cannot read device status, Connection timed out (110) Despite the timeout messages, lsusb got the HID report descriptor. > Note the timeouts at the end. And here is the output of the HID test > program, modified to match this device: > > TRACE: hid_find_usb_device(): inspecting USB device 005/002[0]... > TRACE: hid_compare_usb_device(): comparing match specifications to > USB device... > TRACE: hid_compare_usb_device(): inspecting vendor ID... > TRACE: hid_compare_usb_device(): match on vendor ID: 0x0483. > TRACE: hid_compare_usb_device(): inspecting product ID... > TRACE: hid_compare_usb_device(): match on product ID: 0x5057. > TRACE: hid_compare_usb_device(): no custom matching function > supplied. > NOTICE: hid_find_usb_device(): found a matching USB device > 005/002[0]. > TRACE: hid_force_open(): claiming USB device 005/002[0]. > NOTICE: hid_force_open(): successfully claimed USB device 005/002[0]. > TRACE: hid_init_parser(): initialising the HID parser for USB > Device 005/002[0]... > TRACE: hid_init_parser(): allocating space for HIDData structure... > TRACE: hid_init_parser(): successfully allocated memory for > HIDData strcture. > TRACE: hid_init_parser(): allocating space for HIDParser > structure... > TRACE: hid_init_parser(): successfully allocated memory for > HIDParser strcture. > NOTICE: hid_init_parser(): successfully initialised the HID parser > for USB Device 005/002[0]. > TRACE: hid_prepare_hid_descriptor(): initialising the HID > descriptor for USB device 005/002[0]... > TRACE: hid_prepare_hid_descriptor(): retrieving HID descriptor for > USB device 005/002[0]... > WARNING: hid_prepare_hid_descriptor(): failed to get HID descriptor > for USB device 005/002[0]:error sending control message: Connection > timed out [...] This is a different timeout. > Any help is greatly appreciated. This device works on Windows with > the vendor's software. I suspected as much. I believe lsusb is retrieving the HID descriptors from the end of the interface or configuration descriptor, but libhid is using what should be an equally valid request to fetch /just/ the HID descriptor. Since the device is not behaving according to spec, you may have better luck just operating it with the vendor's software, and using usbsnoop2libusb[*] to construct a custom libusb-based driver. [*] http://iki.fi/lindi/darcs/usbsnoop2libusb/usbsnoop2libusb.pl
_______________________________________________ libhid-discuss mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/libhid-discuss http://libhid.alioth.debian.org/
