Blacklisting a usbhid device

Blacklisting a usbhid device

[Rick L. Vinyard, Jr.]

I'm trying to write a driver for the Logitech G13 keypad, but one of the
first problems I'm running into is the usbhid driver claiming the device.

I'm working on a Fedora 11 system, so I checked the usbhid driver and it
is built in.

I applied the following patch and rebuilt the kernel, but usbhid still
claims the device. Another problem I noticed was that I received a compile
error when I used HID_QUIRK_IGNORE rather than 0x00000004.

Is it not possible to blacklist a device without compiling usbhid as a
module?

Also below is the output of lsusb -vvv for the G13.

Any suggestions on how to either work within the usbhid framework or how
to get usbhid to stop claiming the device?

Thanks,

Rick


diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 6301010..611a24d 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -18,6 +18,7 @@
 #ifndef HID_IDS_H_FILE
 #define HID_IDS_H_FILE

+#define USB_DEVICE_ID_LOGITECH_G13		0xc21c
 #define USB_VENDOR_ID_A4TECH		0x09da
 #define USB_DEVICE_ID_A4TECH_WCP32PU	0x0006
 #define USB_DEVICE_ID_A4TECH_X5_005D	0x000a
diff --git a/drivers/hid/usbhid/hid-quirks.c
b/drivers/hid/usbhid/hid-quirks.c
index d8f7423..65de9ef 100644
--- a/drivers/hid/usbhid/hid-quirks.c
+++ b/drivers/hid/usbhid/hid-quirks.c
@@ -63,6 +63,7 @@ static const struct hid_blacklist {

 	{ USB_VENDOR_ID_WISEGROUP_LTD, USB_DEVICE_ID_SMARTJOY_DUAL_PLUS,
HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
 	{ USB_VENDOR_ID_WISEGROUP_LTD2, USB_DEVICE_ID_SMARTJOY_DUAL_PLUS,
HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
+	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G13, 0x00000004 },

 	{ 0, 0 }
 };




Bus 005 Device 007: ID 046d:c21c Logitech, Inc.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x046d Logitech, Inc.
  idProduct          0xc21c
  bcdDevice            1.03
  iManufacturer           0
  iProduct                1 G13
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           41
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      61
         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               2
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
Device Status:     0x0000
  (Bus Powered)

Re: Blacklisting a usbhid device

[Jiri Slaby]

On 07/21/2009 10:40 PM, Rick L. Vinyard, Jr. wrote:
> --- a/drivers/hid/usbhid/hid-quirks.c
> +++ b/drivers/hid/usbhid/hid-quirks.c
> @@ -63,6 +63,7 @@ static const struct hid_blacklist {
> 
>  	{ USB_VENDOR_ID_WISEGROUP_LTD, USB_DEVICE_ID_SMARTJOY_DUAL_PLUS,
> HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
>  	{ USB_VENDOR_ID_WISEGROUP_LTD2, USB_DEVICE_ID_SMARTJOY_DUAL_PLUS,
> HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
> +	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G13, 0x00000004 },
> 
>  	{ 0, 0 }
>  };

It's too late for driver base to not bind the device with usbhid. Use
hid_ignore_list in drivers/hid/hid-core.c instead. This list contains
rather quirks.

Re: Blacklisting a usbhid device

[Adam Nielsen]

> Any suggestions on how to either work within the usbhid framework or how
> to get usbhid to stop claiming the device?

>From userland you can get the usbhid driver to release the device like this:

  cd /sys/bus/usb/drivers/usbhid
  echo '9-1:1.0' > unbind

Where '9-1:1.0' is the device you want to release.  Presumably you could do
the same thing on the kernel side when your driver is loaded.  This would give
better functionality, in that the usbhid driver would handle basic
functionality if your driver isn't loaded, but as soon as your driver was
loaded the extra functionality would become available.

Of course this bypasses usbhid's functionality.  I imagine it would be better
to write a hid driver and let usbhid handle the USB side of things.  Have a
look in drivers/hid/ for some hid driver examples that do this.

Cheers,
Adam.