Quote:
Originally Posted by
Corona688
The modem must have a way to inform the Linux kernel when to send data or when not to send data but this depends on the hardware.
Looks like I'd have to ask modem manufacturers if their modems can return how much data are inside modem buffer....
usb_submit_urb puts data to HCD (Host Controller Driver). Does HCD put data to device directly, or it transfers data to the next level of Linux kernel?
Quote:
Originally Posted by
Corona688
Not necessarily. For some hardware it might be the other way around -- the modem might tell Linux when the buffer is full or not full.
Is there at least one modem that returns buffer size information?