Date: Sat, 24 Nov 2012 00:00:44 +0100 From: Niclas Zeising <zeising+freebsd@daemonic.se> To: hackers@freebsd.org Subject: Questions about USB, uhid, ukbd and quirks Message-ID: <50B0001C.6050202@daemonic.se>
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Hi! I have a couple of questions about USB. I recently bought a new USB keyboard, a Logitech K120. When attaching this to a FreeBSD system, however, it is detected as a hid device (attaching to uhid) rather than a keyboard (attaching to ukbd). The keyboard works fine, but I'm just curious as to why it doesn't use ukbd. The output from usbconfig for this keyboard is: ugen2.3: <USB Keyboard Logitech> at usbus2, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON bLength = 0x0012 bDescriptorType = 0x0001 bcdUSB = 0x0110 bDeviceClass = 0x0000 bDeviceSubClass = 0x0000 bDeviceProtocol = 0x0000 bMaxPacketSize0 = 0x0008 idVendor = 0x046d idProduct = 0xc31c bcdDevice = 0x6400 iManufacturer = 0x0001 <Logitech> iProduct = 0x0002 <USB Keyboard> iSerialNumber = 0x0000 <no string> bNumConfigurations = 0x0001 If I add the qurik UQ_HID_IGNORE, it attaches with ukbd and works fine. I don't know if this is appropriate to add to the general quriks though. I have another keyboard, also Logitech, but older. This one attaches to ukbd, but the manufacture string says LITEON. Is this string fetched from the device, or is it somehow stored in the usb drivers? The output from usbconfig for this keyboard is: ugen4.2: <USB Multimedia Keyboard LITEON Technology> at usbus4, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON bLength = 0x0012 bDescriptorType = 0x0001 bcdUSB = 0x0110 bDeviceClass = 0x0000 bDeviceSubClass = 0x0000 bDeviceProtocol = 0x0000 bMaxPacketSize0 = 0x0008 idVendor = 0x046d idProduct = 0xc312 bcdDevice = 0x0101 iManufacturer = 0x0001 <LITEON Technology> iProduct = 0x0002 <USB Multimedia Keyboard> iSerialNumber = 0x0000 <no string> bNumConfigurations = 0x0001 These issues probably have natural explanations, but it's making me slightly confused, so I hope someone can shed some light on them. Regards! -- Niclas
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