USB_INTERRUPT_MSG(9) USB Core APIs USB_INTERRUPT_MSG(9)NAME
usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for completion
int usb_interrupt_msg(struct usb_device * usb_dev, unsigned int pipe, void * data, int len, int * actual_length, int timeout);
pointer to the usb device to send the message to
endpoint "pipe" to send the message to
pointer to the data to send
length in bytes of the data to send
pointer to a location to put the actual length transferred in bytes
time in msecs to wait for the message to complete before timing out (if 0 the wait is forever)
This function sends a simple interrupt message to a specified endpoint and waits for the message to complete, or timeout.
Don't use this function from within an interrupt context, like a bottom half handler. If you need an asynchronous message, or need to send
a message from within interrupt context, use usb_submit_urb If a thread in your driver uses this call, make sure your disconnect method can
wait for it to complete. Since you don't have a handle on the URB used, you can't cancel the request.
If successful, 0. Otherwise a negative error number. The number of actual bytes transferred will be stored in the actual_length paramater.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_INTERRUPT_MSG(9)
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