What is my USB Keyboard port address?

Piquant77 · 01-18-2008, 02:22 PM

Hi guys, I've been trying to use a program that refers to my keyboard port.

Code:

#define KEYBOARD_PORT 0x60
#define KEYBOARD_STATUS_PORT 0x64

This is standard and it works perfectly. It listens to the /dev/input/event1 device node, which is my laptop keyboard.

Now I would like to make it listen to /dev/input/event3, which is my external USB keyboard device node. The problem is, I have no clue what port it is and I don't know how to find out. I tried stuff like lsusb -v but I don't know where to look. Can anyone give me a hint? It would be much appreciated. Thanks.

farslayer · 01-18-2008, 03:55 PM

Code:

Bus 005 Device 002: ID 413c:2003 Dell Computer Corp.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x413c Dell Computer Corp.
  idProduct          0x2003
  bcdDevice            3.01
  iManufacturer           1
  iProduct                2
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower               70mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors:
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN  <-- is this what you are looking to find ?
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              24
cannot read device status, Operation not permitted (1)



Bus 003 Device 003: ID 413c:2003 Dell Computer Corp.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x413c Dell Computer Corp.
  idProduct          0x2003
  bcdDevice            3.01
  iManufacturer           1
  iProduct                2
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower               70mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors:
           ** UNAVAILABLE **
      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              24
cannot read device status, Operation not permitted (1)

I have 2 usb keyboards attached to this system and they both share the same endpoint address.. the Bus and device ID's are the only difference showing. I would have expected the addresses to be different.. hrm..

Piquant77 · 01-19-2008, 02:17 AM

I already went through reading this and I don't think the 0x81 means anything very revealing since all my USB ports share it.

I also looked in /proc/ioports

Code:

0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-006f : keyboard
0070-0077 : rtc
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : 0000:00:1f.2
  0170-0177 : libata
01f0-01f7 : 0000:00:1f.2
  01f0-01f7 : libata
0376-0376 : 0000:00:1f.2
  0376-0376 : libata
03c0-03df : vga+
03f6-03f6 : 0000:00:1f.2
  03f6-03f6 : libata
04d0-04d1 : pnp 00:02
0910-091f : pnp 00:08
0920-092f : pnp 00:08
0930-097f : pnp 00:08
0cb0-0cbf : pnp 00:08
0cf8-0cff : PCI conf1
1000-107f : 0000:00:1f.0
  1000-1005 : pnp 00:02
    1000-1003 : ACPI PM1a_EVT_BLK
    1004-1005 : ACPI PM1a_CNT_BLK
  1006-1007 : pnp 00:03
  1008-100f : pnp 00:02
    1008-100b : ACPI PM_TMR
  1010-1015 : ACPI CPU throttle
  1020-1020 : ACPI PM2_CNT_BLK
  1028-102f : ACPI GPE0_BLK
  1060-107f : pnp 00:03
    1060-107f : iTCO_wdt
1080-10bf : 0000:00:1f.0
  1080-10bf : pnp 00:03
10c0-10df : 0000:00:1f.3
  10c0-10df : pnp 00:03
bf20-bf3f : 0000:00:1d.3
  bf20-bf3f : uhci_hcd
bf40-bf5f : 0000:00:1d.2
  bf40-bf5f : uhci_hcd
bf60-bf7f : 0000:00:1d.1
  bf60-bf7f : uhci_hcd
bf80-bf9f : 0000:00:1d.0
  bf80-bf9f : uhci_hcd
bfa0-bfaf : 0000:00:1f.2
  bfa0-bfaf : libata
e000-efff : PCI Bus #0d
f400-f4fe : pnp 00:03

I can see there's the standard 0x60 keyboard address and I can also see the four universal serial bus addresses. I tried them but it didn't work. Anyway, the port range isn't the same length than 0x60 - 0x6f so I guess it's interpreted differently when it goes through USB.

After doing some research (I'm not an expert by any means) I don't think I can just replace the port address in my code. The solution could be a layer higher... maybe I should just find a way to connect /dev/input/event3 (USB keyboard) to /dev/input/event1 (standard 0x60 laptop keyboard).

Anyway, thanks for you interest.