On Tue, Jul 27, 2010 at 2:22 AM, loody <miloody@xxxxxxxxx> wrote: > Dear all: > I see there are report and physical descriptrs in hid spec. > But when I dump my HID device, a mouse, I cannot see these 2 descriptors. > How could I see these 2 descriptors on my HID device? > attach the content of my HID device at the end of letter. > Appreciate your help, > miloody > > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 3 Human Interface Device > bInterfaceSubClass 1 Boot Interface Subclass > bInterfaceProtocol 2 Mouse > iInterface 0 > ** UNRECOGNIZED: 09 21 10 01 00 01 22 34 00 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0004 1x 4 bytes > bInterval 10 > Device Status: 0x0000 > (Bus Powered) Hi, Your question is not very clear. I guess you want lsusb to dump the report descriptors. It doesn't, as far as I know. It is not considered safe to access a device via the control pipe while it is also being controlled by a driver. However, this is a dump of the config descriptor and this field: ** UNRECOGNIZED: 09 21 10 01 00 01 22 34 00 can be manually decoded as: The HID descriptor always follows the interface descriptor when the interface belongs to the HID class. After the usual first 2 bytes, bcdHID specifies which version of the HID specification this interface is compliant with. bCountryCode specifies that there is no special localisation involved with this mouse. The last three fields specify that there is one further descriptor to fetch associated with this class; a HID REPORT(=hex 22) descriptor, and informs the host to expect it to be 34 hex bytes in length. It would require a control transfer to fetch the REPORT descriptor. Regards, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
