Fw: trouble sending bytes to uhid (Griffin PowerMate on 5.3-STABLE/i386)

[Fernando Durango]

Hello all,

I originally posted this to hackers@ a while back. Mathew Kanner suggested
I try NetBSD as their USB framework seemed a bit more up to date. Then I
noticed the new usb@ list and figured I'd try my request here.

TIA,

    -F

----- Original Message -----
From: "Fernando Durango" <fernando at bsdmail.org>
To: freebsd-hackers at freebsd.org
Subject: trouble sending bytes to uhid (Griffin PowerMate on 5.3-STABLE/i386)
Date: Wed, 17 Nov 2004 03:36:11 +0800

> 
> Hello all,
> 
> I have a Griffin PowerMate[1] that I would love to be able to manipulate
> via uhid on FreeBSD. Running a USB sniffer on a win32 box shows the device
> spews 6 bytes of data on dial movement and/or button pressing, and the pc
> sending one byte to the PowerMate occasionally, which seems to effect LED
> brightness on the Powermate. I am able to read and interpret the device
> output with perl(sysopen & sysread), but I am unable to send bytes back to
> the device (syswrite).
> 
> The device shows up as follows:
> $ dmesg | grep uhid
> uhid0: Griffin Technology, Inc. Griffin PowerMate, rev 1.00/4.00, 
> addr 2, iclass 3/0
> $ usbdevs -d -v
> addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), 
> Intel(0x0000), rev 1.00
>    uhub1
>   port 1 addr 2: low speed, power 100 mA, config 1, Griffin 
> PowerMate(0x0410), Griffin Technology, Inc.(0x077d), rev 4.00
>     uhid0
> $ usbhidctl -r -f /dev/uhid0
> Report descriptor:
> Collection page=Consumer usage=Consumer_Control
> Input   size=1 count=1 page=Button usage=Button_1, logical range 0..1
> Input   size=8 count=1 page=Generic_Desktop usage=Rx, logical range -127..127
> Input   size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Input   size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Input   size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Input   size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Output  size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> Feature size=8 count=1 page=Consumer usage=Consumer_Control, 
> logical range 0..255
> End collection
> Total   input size 6 bytes
> Total  output size 0 bytes
> Total feature size 0 bytes
> 
> perl code for reading:
> sysopen(DATA, "/dev/uhid0", O_RDONLY | O_NODELAY | O_BINARY)
>    or die "could not open $device!\n";
> 
> while (1) {
>      my $buf;
>      if (sysread(DATA, $buf, 6)) {
>          my @ascii = map { ord } split //, $buf;
>          foreach ( @ascii ) {
>              print "$_\t";
>          }
>          print "\n";
>      }
> }
> 
> perl code for writing:
> sysopen(DATA, "/dev/uhid0", O_RDWR)
>    or die "could not open $device!\n";
> 
> $val = 0xff;
> if (length($val) != syswrite(DATA, $val, length($val))) {
>      die "This is Bad: $!\n";
> }
> 
> close(DATA);
> 
> When trying to write, I get the error "This is Bad: Bad file descriptor"
> Is it not possible to write to a uhid device?
> 
> Thanks in advance!
> 
>     -F
> 
> [1] http://www.griffintechnology.com/products/powermate/
> 

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