Hello Everyone,
Greg Kroah-Hartman directed me to here.
Here is what I am trying to do, what problems am I facing and what I've
tried so far:
My keyboard is USB and it is supposed to have NKRO (the ability to
register as many keys as pressed). (I know the protocol doesn't really
allow it and it's using some hack).
However, the NKRO doesn't work in Linux (By not working, I mean it only
registers 6 keys and modifiers.), so I am trying to investigate what is
happening. For example is it just sending one stream of
data (the 6KRO one (referred to as boot mode)) or two and one gets
ignored. In theory, since I know the NKRO works in Windows and
supposedly in Mac OS X, I think it is sending two but one of them gets
ignored somehow.
I've first ran lsbusb and got this:
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 011: ID 2516:003c
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 046d:082d Logitech, Inc. HD Pro Webcam C920
Bus 001 Device 002: ID 046d:c07d Logitech, Inc.
Bus 001 Device 005: ID 0909:001c Audio-Technica Corp.
Bus 001 Device 004: ID 0951:16a4 Kingston Technology
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
I know that the second line refers to the keyboard:
Bus 003 Device 011: ID 2516:003c
I've run: sudo bash -c "echo -n 3-2:1.0
> /sys/bus/usb/drivers/usbhid/unbind"; sudo bash -c "echo -n 3-2:1.2
> /sys/bus/usb/drivers/usbhid/unbind"; sudo lsusb -v -d 2516:003c;
(I've run it as sudo so I get rid of the 'Couldn't open device, some
information will be missing' and hopefully get the full info. I've
unbind the device to get the Debug descriptor, however since at places,
I still get
can't get debug descriptor: Resource temporarily unavailable I thought
I'd unbind both device events that show up in dmesg after plugging the
device')
The output for the device in dmesg is the following:
[387473.151166] usb 3-2: new full-speed USB device number 11 using xhci_hcd
[387473.320074] usb 3-2: New USB device found, idVendor=2516, idProduct=003c
[387473.320079] usb 3-2: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[387473.320103] usb 3-2: Product: MASTERKEYS PRO S
[387473.320105] usb 3-2: Manufacturer: Cooler Master Technology Inc.
[387473.322051] input: Cooler Master Technology Inc. MASTERKEYS PRO S as
/devices/pci0000:00/0000:00:1c.0/0000:03:00.0/0000:04:02.0/0000:07:00.0/usb3/3-2/3-2:1.0/0003:2516:003C.0026/input/input44
[387473.373897] hid-generic 0003:2516:003C.0026: input,hidraw2: USB HID
v1.11 Keyboard [Cooler Master Technology Inc. MASTERKEYS PRO S] on
usb-0000:07:00.0-2/input0
[387473.374961] hid-generic 0003:2516:003C.0027: hiddev0,hidraw3: USB
HID v1.11 Device [Cooler Master Technology Inc. MASTERKEYS PRO S] on
usb-0000:07:00.0-2/input1
[387473.376754] input: Cooler Master Technology Inc. MASTERKEYS PRO S as
/devices/pci0000:00/0000:00:1c.0/0000:03:00.0/0000:04:02.0/0000:07:00.0/usb3/3-2/3-2:1.2/0003:2516:003C.0028/input/input45
[387473.428595] hid-generic 0003:2516:003C.0028: input,hidraw4: USB HID
v1.11 Keyboard [Cooler Master Technology Inc. MASTERKEYS PRO S] on
usb-0000:07:00.0-2/input2
As you can see, there are two input: lines having different parts in the
path in the form of 3-2:1.0 and 3-2:1.2 (to be honest no idea why and
what that means)
The output of: sudo bash -c "echo -n 3-2:1.0
> /sys/bus/usb/drivers/usbhid/unbind"; sudo bash -c "echo -n 3-2:1.2
> /sys/bus/usb/drivers/usbhid/unbind"; sudo lsusb -v -d 2516:003c; is the
following:
Bus 003 Device 008: ID 2516:003c
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x2516
idProduct 0x003c
bcdDevice 12.01
iManufacturer 1 Cooler Master Technology Inc.
iProduct 2 MASTERKEYS PRO S
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 91
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 1 Boot Interface Subclass
bInterfaceProtocol 1 Keyboard
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 64
Report Descriptor: (length is 64)
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x06 ] 6
Keyboard
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Local ): Usage Minimum, data= [ 0xe0 ] 224
Control Left
Item(Local ): Usage Maximum, data= [ 0xe7 ] 231
GUI Right
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x08 ] 8
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Main ): Input, data= [ 0x03 ] 3
Constant Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x03 ] 3
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Usage Page, data= [ 0x08 ] 8
LEDs
Item(Local ): Usage Minimum, data= [ 0x01 ] 1
NumLock
Item(Local ): Usage Maximum, data= [ 0x03 ] 3
Scroll Lock
Item(Main ): Output, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x05 ] 5
Item(Main ): Output, data= [ 0x03 ] 3
Constant Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x06 ] 6
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0xa4 0x00 ] 164
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Local ): Usage Minimum, data= [ 0x00 ] 0
No Event
Item(Local ): Usage Maximum, data= [ 0xa4 ] 164
ExSel
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
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 34
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 134
Report Descriptor: (length is 134)
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x80 ] 128
System Control
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x01 ] 1
Item(Local ): Usage Minimum, data= [ 0x81 ] 129
System Power Down
Item(Local ): Usage Maximum, data= [ 0x83 ] 131
System Wake Up
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x03 ] 3
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x05 ] 5
Item(Main ): Input, data= [ 0x01 ] 1
Constant Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
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(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x12 ] 18
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Local ): Usage, data= [ 0x83 0x01 ] 387
AL Consumer Control Configuration
Item(Local ): Usage, data= [ 0x8a 0x01 ] 394
AL Email Reader
Item(Local ): Usage, data= [ 0x92 0x01 ] 402
AL Calculator
Item(Local ): Usage, data= [ 0x94 0x01 ] 404
AL Local Machine Browser
Item(Local ): Usage, data= [ 0xcd ] 205
Play/Pause
Item(Local ): Usage, data= [ 0xb7 ] 183
Stop
Item(Local ): Usage, data= [ 0xb6 ] 182
Scan Previous Track
Item(Local ): Usage, data= [ 0xb5 ] 181
Scan Next Track
Item(Local ): Usage, data= [ 0xe2 ] 226
Mute
Item(Local ): Usage, data= [ 0xea ] 234
Volume Decrement
Item(Local ): Usage, data= [ 0xe9 ] 233
Volume Increment
Item(Local ): Usage, data= [ 0x21 0x02 ] 545
AC Search
Item(Local ): Usage, data= [ 0x23 0x02 ] 547
AC Home
Item(Local ): Usage, data= [ 0x24 0x02 ] 548
AC Back
Item(Local ): Usage, data= [ 0x25 0x02 ] 549
AC Forward
Item(Local ): Usage, data= [ 0x26 0x02 ] 550
AC Stop
Item(Local ): Usage, data= [ 0x27 0x02 ] 551
AC Refresh
Item(Local ): Usage, data= [ 0x2a 0x02 ] 554
(null)
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x0e ] 14
Item(Main ): Input, data= [ 0x01 ] 1
Constant Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x06 ] 6
Keyboard
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x04 ] 4
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Main ): Input, data= [ 0x03 ] 3
Constant Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0xe8 ] 232
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Local ): Usage Minimum, data= [ 0x00 ] 0
No Event
Item(Local ): Usage Maximum, data= [ 0xe7 ] 231
GUI Right
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
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
can't get debug descriptor: Resource temporarily unavailable
Device Status: 0x0000
(Bus Powered)
I've also did this:
sudo usbhid-dump -d2516 -i255
003:010:002:DESCRIPTOR 1503191059.257117
05 01 09 80 A1 01 85 01 19 81 29 83 15 00 25 01
95 03 75 01 81 02 95 01 75 05 81 01 C0 05 0C 09
01 A1 01 85 02 15 00 25 01 95 12 75 01 0A 83 01
0A 8A 01 0A 92 01 0A 94 01 09 CD 09 B7 09 B6 09
B5 09 E2 09 EA 09 E9 0A 21 02 0A 23 02 0A 24 02
0A 25 02 0A 26 02 0A 27 02 0A 2A 02 81 02 95 01
75 0E 81 01 C0 05 01 09 06 A1 01 85 04 05 07 95
01 75 08 81 03 95 E8 75 01 15 00 25 01 05 07 19
00 29 E7 81 00 C0
003:010:001:DESCRIPTOR 1503191059.257558
06 00 FF 09 01 A1 01 09 02 15 00 26 FF 00 75 08
95 40 81 02 09 03 15 00 26 FF 00 75 08 95 40 91
02 C0
003:010:000:DESCRIPTOR 1503191059.257945
05 01 09 06 A1 01 05 07 19 E0 29 E7 15 00 25 01
75 01 95 08 81 02 95 01 75 08 81 03 95 03 75 01
05 08 19 01 29 03 91 02 95 01 75 05 91 03 95 06
75 08 15 00 26 A4 00 05 07 19 00 29 A4 81 00 C0
sudo usbhid-dump -d2516 -i255 | grep -v : | xxd -r -p | hidrd-convert -o
spec
(here the 2516 is the vendor id from the vendor id: product id pair, as
for the 255 after the i, that's how I saw it in the article I was
looking at, recently I've saw examples with other integers there but I
have no idea what's the difference and it was 255 in the article related
to my issue so I've used it):
The output is:
Usage Page (Desktop), ; Generic desktop controls (01h)
Usage (Sys Control), ; System control (80h,
application collection)
Collection (Application),
Report ID (1),
Usage Minimum (Sys Power Down), ; System power down (81h,
one-shot control)
Usage Maximum (Sys Wake Up), ; System wake up (83h, one-shot
control)
Logical Minimum (0),
Logical Maximum (1),
Report Count (3),
Report Size (1),
Input (Variable),
Report Count (1),
Report Size (5),
Input
(Constant),
\
End
Collection,
\
Usage Page (Consumer), ; Consumer
(0Ch)
\
Usage (Consumer Control), ; Consumer control (01h,
application
collection)
\
Collection
(Application),
\
Report ID
(2),
\
Logical Minimum
(0),
\
Logical Maximum
(1),
\
Report Count
(18),
\
Report Size
(1),
\
Usage (AL Consumer Control Config), ; AL consumer control
configuration (0183h,
selector)
\
Usage (AL Email Reader), ; AL email reader (018Ah,
selector)
\
Usage (AL Calculator), ; AL calculator (0192h,
selector)
\
Usage (AL Local Machine Brwsr), ; AL local machine browser
(0194h,
selector)
\
Usage (Play Pause), ; Play/pause (CDh, one-shot
control)
\
Usage (Stop), ; Stop (B7h, one-shot
control)
\
Usage (Scan Previous Track), ; Scan previous track (B6h,
one-shot
control)
\
Usage (Scan Next Track), ; Scan next track (B5h, one-shot
control)
\
Usage (Mute), ; Mute (E2h, on/off control)
Usage (Volume Dec), ; Volume decrement (EAh,
re-trigger control)
Usage (Volume Inc), ; Volume increment (E9h,
re-trigger control)
Usage (AC Search), ; AC search (0221h, selector)
Usage (AC Home), ; AC home (0223h, selector)
Usage (AC Back), ; AC back (0224h, selector)
Usage (AC Forward), ; AC forward (0225h, selector)
Usage (AC Stop), ; AC stop (0226h, selector)
Usage (AC Refresh), ; AC refresh (0227h, selector)
Usage (AC Bookmarks), ; AC bookmarks (022Ah, selector)
Input (Variable),
Report Count (1),
Report Size (14),
Input (Constant),
End Collection,
Usage Page (Desktop), ; Generic desktop controls (01h)
Usage (Keyboard), ; Keyboard (06h, application
collection)
Collection (Application),
Report ID (4),
Usage Page (Keyboard), ; Keyboard/keypad (07h)
Report Count (1),
Report Size (8),
Input (Constant, Variable),
Report Count (232),
Report Size (1),
Logical Minimum (0),
Logical Maximum (1),
Usage Page (Keyboard), ; Keyboard/keypad (07h)
Usage Minimum (None), ; No event (00h, selector)
Usage Maximum (KB Right GUI), ; Keyboard right GUI (E7h,
dynamic value)
Input,
End Collection,
Usage Page (FF00h), ; FF00h, vendor-defined
Usage (01h),
Collection (Application),
Usage (02h),
Logical Minimum (0),
Logical Maximum (255),
Report Size (8),
Report Count (64),
Input (Variable),
Usage (03h),
Logical Minimum (0),
Logical Maximum (255),
Report Size (8),
Report Count (64),
Output (Variable),
End Collection,
Usage Page (Desktop), ; Generic desktop controls (01h)
Usage (Keyboard), ; Keyboard (06h, application
collection)
Collection (Application),
Usage Page (Keyboard), ; Keyboard/keypad (07h)
Usage Minimum (KB Leftcontrol), ; Keyboard left control (E0h,
dynamic value)
Usage Maximum (KB Right GUI), ; Keyboard right GUI (E7h,
dynamic value)
Logical Minimum (0),
Logical Maximum (1),
Report Size (1),
Report Count (8),
Input (Variable),
Report Count (1),
Report Size (8),
Input (Constant, Variable),
Report Count (3),
Report Size (1),
Usage Page (LED), ; LEDs (08h)
Usage Minimum (01h),
Usage Maximum (03h),
Output (Variable),
Report Count (1),
Report Size (5),
Output (Constant, Variable),
Report Count (6),
Report Size (8),
Logical Minimum (0),
Logical Maximum (164),
Usage Page (Keyboard), ; Keyboard/keypad (07h)
Usage Minimum (None), ; No event (00h, selector)
Usage Maximum (KB ExSel), ; Keyboard ExSel (A4h, selector)
Input,
End Collection
I think I am on the right track with the information hunting however at
this point I have no idea about what should I do further.
Is this information enough to find out what's going on or do I need more
info and what kind of info do I need?
If this information is enough - well, to be honest I don't understand
shit from it. How do I learn to understand it better?
Best Regards,
IFo Hancroft
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