I have a device (PowerLinc USB) that sends and receives 8 bytes of data.
For reading, upon receiving an event I read the report, then the field, and
then read the usage 8 times with the usage_index incremented for each read.
It works perfectly.
Now, when I try to reverse that process with the following code, the system
gives an error "usb_submit_urb(out)" and the HID system stops responding.
This is all under kernel 2.6.0 and 2.6.1.
for (i = 0; i < hidout.field_info.maxusage; i++) {
hidout.usage_ref.report_type = hidout.rep_info.report_type;
hidout.usage_ref.report_id = 0;
hidout.usage_ref.field_index = 0;
hidout.usage_ref.usage_index = i;
hidout.usage_ref.value = c[i];
ioctl(fd,HIDIOCSUSAGE,&hidout.usage_ref);
}
hidout.rep_info.report_type = HID_REPORT_TYPE_OUTPUT;
hidout.rep_info.report_id = 0;
hidout.rep_info.num_fields = 1;
ret = ioctl(fd,HIDIOCSREPORT,&hidout.rep_info);
I have a module that is written to talk directly to the usb core that works
by sending the 8 bytes in a urb exactly the same way that the 8 bytes are
read from the device through a urb. The code for that is in the project
wish.sourceforge.net and works just fine but has other side effects such as
conflicting with HID and having to change with every kernel release. I want
to convert to HID so that I stop chasing the changes in the kernel.
Have I oversimplified my assumption that writing is the reverse of reading
using the usage calls? I have seen multiple requests for information on how
to write multiple bytes but I cannot find any direction or indication that
someone has figured out how to actually do it.
Any help is greatly appreciated.
Scott
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