Re: patch usb-iowarrior.patch added to gregkh-2.6 tree (was: Want to write driver for IrDA-USB dongle, question on possible course of action)

The usb-iowarrior patch looks interesting, since it might be used to 
drive a particular USB-IrDA dongle I have (idProduct 0x4200). I have a 
strong suspicion that this dongle is nothing more than a serial device 
wired to a IR transceiver. What should I take into account in order to 
test this dongle with the patch?

(original mail for information includes lsusb report and is quoted below)

Alex Villací­s Lasso escribió:
> (Originally posted in linux-usb-users, but this seems more appropriate 
> for linux-usb-devel)
>
> 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?
>
> (currently downloading IrDA specs, but I thought I might as well ask 
> this now)
>
> Alex Villacís Lasso
>
>   
-- 

perl -e '$x = 2.4; print sprintf("%.0f + %.0f = %.0f\n", $x, $x, $x + $x);'


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