[clug] usb/serial help required
bradh at frogmouth.net
Sat Jul 7 08:17:10 GMT 2007
On Saturday 07 July 2007 18:00, Eyal Lebedinsky wrote:
> I am trying to connect to my UPS from linux. It was on a windows machine
> which is now running under vmware on my linux ws.
> The windows software accepts a serial and a USB connection, however my
> ups model only has a USB cable which appears to be on a usb<->serial
> converter (see messages below).
> How do I create the serial device? I tried to load usbserial and play
> with its arguments but so far I could not get the required serial device,
> which I understand should be accessible with something like
> modprobe usbserial vendor=0x0f03 product=0x0001
> mknod /dev/ttyUSB0 c 188 0
> stty </dev/ttyUSB0
You shouldn't need to create them on any newish machine, because device nodes
are supposed to be created as required by the kernel (or perhaps some
user-space helper, I'm not that familiar with this).
> Connecting the UPS USB cable I see these messages:
> usb 4-2: new low speed USB device using uhci_hcd and address 5
> usb 4-2: configuration #1 chosen from 1 choice
> input: Ver 1.0 USB To RS232 Interface (V1.0) BaudRate 2400bps as
> /class/input/input26 input: USB HID v1.00 Gamepad [Ver 1.0 USB To RS232
> Interface (V1.0) BaudRate 2400bps] on usb-0000:00:1d.1-2
That looks like the device is a being claimed by the HID driver, not the
> bInterfaceClass 3 Human Interface Devices
> bInterfaceSubClass 1 Boot Interface Subclass
> bInterfaceProtocol 2 Mouse
> iInterface 5 USB
> HID Device Descriptor:
> bLength 9
> bDescriptorType 33
> bcdHID 1.00
> bCountryCode 0 Not supported
> bNumDescriptors 1
> bDescriptorType 34 Report
> wDescriptorLength 35
> Report Descriptors:
> ** UNAVAILABLE **
Given the descriptor, it looks like the kernel is doing the right thing.
I'm not sure you are going to be able to fix this without hacking the kernel.
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