Hello,
may I ask for some help with my current problem?
I am doing the following call:
ret = usb_control_msg(
cp->usbdev, // pointer to device
usb_sndctrlpipe( cp->usbdev, 0 ), // pipe to control endpoint
0x03, // message request value
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER, // message request type
0x01, // message value
0x12, // message index
NULL, // pointer to the data to send
0, // length
HZ * 2); // time to wait
This is a control message with no data. The only information is
in the setup paket.
The return value of usb_control_msg is 0. No errors.
But from the observable reaction of the device, it reacts as
if the message was not received.
I am using linux 2.4.0 with usb-uhci. I have found similar calls
inside the hub.c and ibmcam.c drivers.
Is there anything special with this call? Some known bugs?
I want to check this up before I am going deep into the problem.
best regards
Wolfgang M�es
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