I exchanged some e-mail with Vojtech (input layer and usb_hid mantainer)
until we found out that hid-core.c was giving up here:
hid-core.c line 1331
if ((n = hid_get_class_descriptor(dev, interface->bInterfaceNumber,
HID_DT_REPORT, rdesc, rsize)) < 0) {
dbg("reading report descriptor failed");
return NULL;
}
Hid get_class_descriptor is only a wraper for usb_control_msg.
static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
unsigned char type, void *buf, int size)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE |
USB_DIR_IN,
(type << 8), ifnum, buf, size, HZ *
USB_CTRL_GET_TIMEOUT);
}
I thought it would be a bug in usb-uhci-hcd, but tryed all uhci drivers
in 2.5.20 and none of them worked.
Georg Acher thinks it might be a problem in the HCD framework.
It all works fine under 2.4.
My motherboard is an ASUS A7V133 based on VIA KT133A, the keyboard is a
Microsoft Internet Keyboard Pro.
The special keys show up as other usb device, and used to create a
separete event device.
Here is my /proc/bus/usb/devices
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.05
S: Manufacturer=Linux 2.5.18 usb-uhci-hcd
S: Product=VIA Technologies, Inc. UHCI USB (#2)
S: SerialNumber=00:04.3
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc=222/900 us (25%), #Int= 3, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.05
S: Manufacturer=Linux 2.5.18 usb-uhci-hcd
S: Product=VIA Technologies, Inc. UHCI USB
S: SerialNumber=00:04.2
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 4
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0451 ProdID=1446 Rev= 1.10
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms
T: Bus=01 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=045e ProdID=002b Rev= 1.11
S: Product=Microsoft Internet Keyboard Pro
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=hid
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=(none)
E: Ad=82(I) Atr=03(Int.) MxPS= 3 Ivl=10ms
T: Bus=01 Lev=02 Prnt=02 Port=02 Cnt=02 Dev#= 4 Spd=1.5 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=045e ProdID=0040 Rev= 1.21
S: Manufacturer=Microsoft
S: Product=Microsoft Wheel Mouse Optical�
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=hid
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=10ms
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