On Sun, 11 Feb 2007, Guenther Sohler wrote:
> Dear Users,
>
> On ebay I got a usb remote control. This is a ir receiver having a usb plug
> and an ir remote control sender.
>
> It is a Cypress Semiconductor eDio USB Multi Remote Controller
> from Formosa Industrial Computing, Inc.
> lsusb shows
> Bus 003 Device 023: ID 147a:e006 Formosa Industrial Computing, Inc.
>
> However I want to receive the key strokes
>
> I tried
>
> cat /dev/input/event3 | xxd
>
> But just the first press after plugging in is received. To receive more
> events you have to plug in again.
> the same applies to evexec, but the data displayed is incorrect
I can't answer all your questions. From what you say below, it looks like
the USB stack is working correctly and any problems probably lie in the
input layer.
> Looking at usbmon output looks like this ( when something is requesting data
> from the receiver)
>
> dee5f2e0 614940404 C Ii:023:01 0 4 = 40001b0f
> dee5f2e0 614940421 S Ii:023:01 -115 4 <
> dee5f2e0 615036386 C Ii:023:01 0 4 = 40801b0f
> dee5f2e0 615036401 S Ii:023:01 -115 4 <
> dee5f2e0 615284335 C Ii:023:01 0 4 = 40801b0f
> dee5f2e0 615284353 S Ii:023:01 -115 4 <
>
>
> This looks better. Every keystroke is received.
> But i realized thet the data sent is different. For every event there are 4
> bytes sent
> (but my usb keyboard always sends 8 bytes)
Nothing wrong with that; different devices send messages of different
lengths.
> I suspect an incompatibility with the usbhid driver which requests 8 bytes
> but just gets 4 bytes each time and so
> just works out for the 1st event.
No. Your usbmon log shows that the driver requests 4 bytes.
> I really accept writing my own usb driver(i already have experiance) but my
> driver is never used for my remote device,
> as usbhid still takes precedence and i cannot remove the usbhid driver,
> because its not compiled as a module.
You don't have to unload usbhid in order to unbind it. cd to the
/sys/bus/usb/drivers/usbhid directory and find the filename corresponding
to your device. Let's say it is 1-4:1.0 -- then you can do (as root):
echo -n 1-4:1.0 >unbind
That will unbind usbhid from the device, leaving it available for your
driver to claim.
> How can I best properly receive the remote keystrokes without having to parse
> the usbmon output ?
Find out what's wrong with the input parsing and fix it, so that you don't
need a special driver.
Alan Stern
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