Recently I bought an IrDA USB dongle with Windows-only drivers. When I
plugged
it in in Fedora 4, lsusb reported the following:
Bus 001 Device 005: ID 07c0:4200 Code Mercenaries Hard- und Software GmbH
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x07c0 Code Mercenaries Hard- und Software GmbH
idProduct 0x4200
bcdDevice 0.00
iManufacturer 1 KingSun Co,Ltd
iProduct 2 USB to Irda
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 Usb to Irda
bmAttributes 0x80
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 85
bInterfaceProtocol 0
iInterface 0
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
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
Now, I *know* this particular dongle is not supported in Linux. First,
it announces
itself as a "255 Vendor Specific Class". Second, from what I understood from
irda-usb.c in the 2.6.18-rc2 sources, the endpoints announced by the
dongle should
be both of type Bulk, and these ones are of type Interrupt. What I would
like to
know is the following: is there any possibility that a (naive) replace
of bulk-transfers
with interrupt transfers in irda-usb.c, used as a template for a new
driver, could
possibly work to support this dongle, or is there a fundamental problem with
the bulk-interrupt issue that prevents this and forces a complete
rewrite for a
new driver?
Alex Villacís Lasso
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